35KV/10KV digital protection

YXB-411 digital transformer backup protection device
1 Overview
1.1 Classification of uses of YXB-411 series products:
The YXB-411 series digital transformer backup protection measurement and control device is suitable for transformer backup protection in substations with voltage levels of 110KV and below (including high and low sides of two coil transformers and high, medium, and low sides of three coil transformers), and together with the YXT-411 differential protection measurement and control device, it completes the secondary function of the main transformer compartment.
Main functions of 1.2YXB-411 product:
1.2.1 Protection Function
Three stage (or two-stage, two time limit, optional) composite voltage starting overcurrent protection function;
Two stage zero sequence voltage blocking zero sequence overcurrent;
Zero sequence current blocking zero sequence overvoltage protection;
Overload protection function;
Low voltage protection function;
Low frequency protection function;
Current imbalance protection function;
PT disconnection and insulation monitoring function;
1.2.2 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.2.3 Event recording, fault recording, and statistical functions
The recorded event content includes protective action events and device self-test faults;
Record the type of protective action event, action time, and operating parameters during the protective action; Record the type and occurrence time of self checking fault events of the device;
The content of fault recording includes: the time of protection action, the type of protection action, and the effective values before and after starting the recording;
The data length of fault recording: 2 cycles before and 4 cycles after the fault for five channels, with a total of 192 points for each channel;
1.2.4 Communication function
The device sends real-time data, including measurement data, waveform data, fault and alarm signals, as well as all protection settings, control word system parameters, etc.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands.
1.2.5 Monitoring function
The device has telemetry functions for measuring analog quantities, remote signaling functions for collecting external switch signals, and remote control functions for controlling external switches.
1.2.6 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
2 General Technical Data
2.1 Rated DC data
220 V
The ripple coefficient of DC current voltage shall not exceed 2%, and the voltage fluctuation shall be between 80% and 110% of the rated voltage
2.2 Rated AC data
Rated AC current In: 5A
Rated AC voltage Un: 100V
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%
Frequency fn: 50Hz
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation
No insulation damage after applying 40In for 1 second
2.4 Power consumption
Each protection function module of the DC circuit shall not exceed 8W
AC voltage circuit not exceeding 0.5VA per phase
AC current circuit not exceeding 0.5VA per phase
2.5 Output contacts
In a DC circuit with a voltage not exceeding 250V, a current not exceeding 0.5A, and a time constant of 5 ± 0.75ms, the output contact of the device has a breaking capacity of 50W, and the long-term allowable current for connection does not exceed 5A
2.6 Protection of Main Technical Data
2.6.1 Current Quick Break Protection, Delay Quick Break Protection, Overcurrent Protection, Zero Sequence Overcurrent Protection
2.6.1.1 Action Value
Setting range 1~99.99A
The average error of the accuracy of the action value shall not exceed ± 3%
2.6.1.2 Action time
Setting range 0~120.00s
Under the action current of twice the set value, the measured action time error does not exceed ± 35ms
2.6.1.3 Phase direction function
Sensitivity angle -30 °, average error not exceeding ± 5 °, consistency not exceeding 5 °
Action area 160 , with an average error not exceeding ± 5 
2.6.1.4 Composite voltage starting function
Low voltage startup: setting range 5-100V, setting level difference 0.01V, average error not exceeding ± 3%
Negative sequence voltage startup: setting range 5-100V, setting level difference 0.01V, average error not exceeding ± 3%
2.6.1.5 Zero sequence voltage blocking function (blocking zero sequence overcurrent protection)
The setting range is 20~120V, the setting level difference is 0.01V, and the average error does not exceed ± 3%
2.6.2 Zero sequence current blocking zero sequence overvoltage protection function
2.6.2.1 Action Values
Setting range 20~120V
The average error of the accuracy of the action value shall not exceed ± 3%
2.6.2.2 Action time
Setting range 0~120.00s
Under the action current of twice the set value, the measured action time error does not exceed ± 35ms
2.6.2.3 Zero sequence current lockout
The setting range is 0.05~99.99A, with an average error not exceeding ± 3%
2.6.3 Telemetry accuracy
U. I 0.2 level
P. Q Level 0.5
2.6.4 Remote signaling resolution
No more than 2ms
2.7 Insulation performance
2.7.1 Insulation resistance
The insulation resistance between all circuits and the casing of the device shall not be less than 500M Ω under standard experimental conditions.
2.7.2 Medium strength
The dielectric strength of all circuits and enclosures of the device can withstand AC 50Hz, voltage 2kV (effective value), and conduct a 1-minute experiment without insulation breakdown or flashover phenomenon. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
2.8 Impulse voltage
The conductive part of the device can withstand a standard lightning wave short-term impulse test with an amplitude of 5kV between the exposed non-conductive metal part shell under the specified test atmospheric conditions.
2.9 Anti interference capability
The device can withstand the pulse interference test of attenuated oscillation waves with frequencies of 1MHz and 100kHz as specified in GB/T14598.13 (the first half wave voltage amplitude is 2.5kV for common mode and 1kV for differential mode)
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10
2.10 Mechanical Properties
Working conditions: The device can withstand vibration response and impact response testing with a severity level of 1
Transportation conditions: The device can withstand vibration durability, impact, and collision tests with a severity level of 1
2.11 Environmental conditions
ambient temperature
Work: -10 ℃~+50 ℃
Storage: -25 ℃~+70 ℃. No excitation is applied at the limit value, and the device does not undergo irreversible changes. After the temperature is restored, the device should be able to work normally.
Atmospheric pressure: 80~110kPa (equivalent to an altitude of 2km or below)
Relative humidity: not greater than 90%, no condensation.
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali

YXB-4101 Factory Transformer Protection Device
1 Overview
The series of digital backup protection and measurement devices for factory transformers are suitable for protecting factory transformers, completing functions such as protection, measurement, and communication. Their functions are as follows:
1.1 Protection Function
Three stage composite voltage starting overcurrent protection function;
Zero sequence voltage blocking high voltage side zero sequence two-stage overcurrent and high voltage side zero sequence current blocking zero sequence overvoltage protection;
Low voltage side zero sequence two-stage overcurrent protection;
Overload protection function;
Low voltage protection function;
Body protection function: heavy gas action, over temperature trip, light gas alarm, and over temperature alarm;
PT disconnection and insulation monitoring function;
1.2 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.3 Event recording, fault recording, and statistical functions
The recorded event content includes protective action events and device self-test faults;
Record the type of protective action event, action time, and operating parameters during the protective action; Record the type and occurrence time of self checking fault events of the device;
The content of fault recording includes: the time of protection action, the type of protection action, and the effective values before and after starting the recording;
The data length of fault recording: 2 cycles before and 4 cycles after the fault for five channels, with a total of 192 points for each channel;
1.4 Communication Function
The device sends real-time data, including measurement data, waveform data, fault and alarm signals, as well as all protection settings, control word system parameters, etc.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands.
1.5 Monitoring function
The device has telemetry functions for measuring analog quantities, remote signaling functions for collecting external switch signals, and remote control functions for controlling external switches.
1.6 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
2 General Technical Data
2.1 Rated DC data
220 V
The ripple coefficient of DC current voltage shall not exceed 2%, and the voltage fluctuation shall be between 80% and 110% of the rated voltage
2.2 Rated AC data
Rated AC current In: 5A
Rated AC voltage Un: 100V
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%
Frequency fn: 50Hz
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation
No insulation damage after applying 40In for 1 second
2.4 Power consumption
Each protection function module of the DC circuit shall not exceed 8W
AC voltage circuit not exceeding 0.5VA per phase
AC current circuit not exceeding 0.5VA per phase
2.5 Output contacts
In a DC circuit with a voltage not exceeding 250V, a current not exceeding 0.5A, and a time constant of 5 ± 0.75ms, the output contact of the device has a breaking capacity of 50W, and the long-term allowable current for connection does not exceed 5A
2.6 Protection of Main Technical Data
2.6.1 Current quick break protection, delayed quick break protection, overcurrent protection, high voltage side and low voltage side zero sequence overcurrent protection, overload alarm
2.6.1.1 Action Value
Setting range 1~99.99A
Grade difference of 0.01A
The average error of the accuracy of the action value shall not exceed ± 3%
2.6.1.2 Action time
Setting range 0~120.00s
Grade difference of 0.01 s
The action time measured does not exceed 30ms at an action current twice the set value
2.6.1.3 Composite voltage lockout function
Low voltage lockout: setting range 5-100V, setting level difference 0.01V, average error not exceeding ± 3%
Negative sequence voltage lockout: setting range 5-100V, setting level difference 0.01V, average error not exceeding ± 3%
2.6.1.4 Zero sequence voltage blocking function (blocking zero sequence overcurrent protection)
Setting range 20~199V, setting level difference 0.01V, average error not exceeding ± 3%
2.6.2 Zero sequence current blocking zero sequence overvoltage protection function
2.6.2.1 Action Values
Setting range 20~199V
Grade difference of 0.01V
The average error of the accuracy of the action value shall not exceed ± 3%
2.6.2.2 Action time
Setting range 0~120.00s
Grade difference of 0.01 s
The action time measured does not exceed 30ms at an action current twice the set value
2.6.2.3 Zero sequence current lockout
The setting range is 0.4In~10In, and the setting level difference is 0.01A. The average error does not exceed ± 3%
2.6.3 Telemetry accuracy
U. I 0.2 level
P. Q Level 0.5
2.6.4 Remote signaling resolution
No more than 2ms
2.7 Insulation performance
2.7.1 Insulation resistance
The insulation resistance between all circuits and the casing of the device shall not be less than 500M Ω under standard experimental conditions.
2.7.2 Medium strength
The dielectric strength of all circuits and enclosures of the device can withstand AC 50Hz, voltage 2kV (effective value), and conduct a 1-minute experiment without insulation breakdown or flashover phenomenon. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
2.8 Impulse voltage
The conductive part of the device can withstand a standard lightning wave short-term impulse test with an amplitude of 5KV between the exposed non-conductive metal parts and the outer shell under the specified test atmospheric conditions.
2.9 Anti interference capability
The device can withstand the pulse interference test of attenuated oscillation waves with frequencies of 1MHz and 100kHz as specified in GB/T14598.13 (the first half wave voltage amplitude is 2.5kV for common mode and 1kV for differential mode)
The device can withstand the severe level III electrostatic discharge interference test specified in GB/T14598.14
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9
The device can withstand the rapid transient interference test with severity level III specified in GB/T14598.10
2.10 Mechanical Properties
Working conditions: The device can withstand vibration response and impact response testing with a severity level of 1
Transportation conditions: The device can withstand vibration durability, impact, and collision tests with a severity level of 1
2.11 Environmental conditions
ambient temperature
Work: -10 ℃~+50 ℃
Storage: -25 ℃~+70 ℃. No excitation is applied at the limit value, and the device does not undergo irreversible changes. After the temperature is restored, the device should be able to work normally.
Atmospheric pressure: 80~110kPa (equivalent to an altitude of 2km or below)
Relative humidity: The average maximum relative humidity in the wettest month is 90%, and the average minimum temperature in that month is 25 ℃ with no condensation on the surface. When the maximum temperature is 40 ℃, the average maximum relative humidity does not exceed 50%
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali

YXC-4XX digital capacitor protection and measurement device
1 Overview
The YXC-4XX series digital capacitor protection and measurement device is suitable for medium and low voltage parallel compensation capacitor groups, and is an interlayer device for capacitor units. There are two types of YXC4XX series, namely YXC411 and YXC412. YXC411 measures a section of PT, while YXC412 measures the bus PT and discharge PT. Its functions are as follows:
1.1 Protection function
Three stage overcurrent protection function;
Zero sequence overcurrent protection function;
Zero sequence overvoltage protection function;
Overvoltage protection function (can be activated with no current blocking function);
Low voltage protection function (can be activated with current blocking function);
1.2 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.3 Event recording, fault recording, and statistical functions
The recorded event content includes protective action events and device self-test faults;
Record the type of protective action event, action time, and operating parameters during the protective action; Record the type and occurrence time of self checking fault events of the device;
The content of fault recording includes: the time of protection action, the type of protection action, and the effective values before and after starting the recording;
The data length of fault recording: 2 cycles before and 4 cycles after the fault for five channels, with a total of 192 points for each channel;
1.4 Communication function
The device sends real-time data, including measurement data, waveform data, fault and alarm signals, as well as all protection settings, control word system parameters, etc.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands. Remote online modification of settings and activation/deactivation of certain protection functions.
1.5 Monitoring function
The device has telemetry function for measuring analog quantities such as current, voltage, frequency, etc,
The remote signaling function for collecting position signals of circuit breakers, energy storage, isolation switches, remote/local, and other switch signals, as well as the remote control function for opening and closing circuit breakers and energy storage,
1.6 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
2 General Technical Data
2.1 Rated DC data
220 V
The ripple coefficient of DC current voltage shall not exceed 2%, and the voltage fluctuation shall be between 80% and 110% of the rated voltage
2.2 Rated AC data
Rated AC current In: 5A
Rated AC voltage Un: 100V
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%
Frequency fn: 50Hz, allowable deviation is ± 0.5%
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation
No insulation damage after applying 40In for 1 second
2.4 Power consumption
Each protection function module of the DC circuit shall not exceed 8W
AC voltage circuit not exceeding 0.5VA per phase
AC current circuit not exceeding 0.5VA per phase
2.5 Output contacts
In a DC circuit with a voltage not exceeding 250V, a current not exceeding 0.5A, and a time constant of 5 ± 0.75ms, the breaking capacity of the output contact of the device is 50W, and the long-term allowable current for connection does not exceed 5A.
2.6 Protection of Main Technical Data
2.6.1 Current Quick Break Protection, Delay Quick Break Protection, Overcurrent Protection, Zero Sequence Overcurrent Protection
2.6.1.1 Action Value
Setting range 1~99.99A
Grade difference of 0.01A
The average error of the accuracy of the action value shall not exceed ± 3%
2.6.1.2 Action time
Setting range 0~120.00s
Grade difference of 0.01 s
The action time measured does not exceed 30ms at an action current twice the set value
2.6.2 Overvoltage protection and low voltage protection
2.6.2.1 Action Values
Setting range 5-120V
Grade difference of 0.01V
The average error of the accuracy of the action value shall not exceed ± 3%
2.6.2.2 Action time
Setting range 0~120.00s
Grade difference of 0.01 s
The action time measured does not exceed 30ms at an action current twice the set value
2.6.2.3 Telemetry accuracy
U. I 0.2 level
P. Q Level 0.5
2.6.2.4 Remote signaling resolution
No more than 2ms
2.7 Insulation performance
2.7.1 Insulation resistance
The insulation resistance between all circuits and the casing of the device shall not be less than 500M Ω under standard experimental conditions.
2.7.2 Medium strength
The dielectric strength of all circuits and enclosures of the device can withstand AC 50Hz, voltage 2KV (effective value), and conduct a 1-minute experiment without insulation breakdown or flashover phenomenon. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
2.8 Impulse voltage
The conductive part of the device can withstand a standard lightning wave short-term impulse test with an amplitude of 5kV between the exposed non-conductive metal part shell under the specified test atmospheric conditions.
2.9 Anti interference capability
The device can withstand the pulse interference test of attenuated oscillation waves with frequencies of 1MHz and 100kHz as specified in GB/T14598.13 (the first half wave voltage amplitude is 2.5kV for common mode and 1kV for differential mode)
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10
2.10 Mechanical Properties
Working conditions: The device can withstand vibration response and impact response testing with a severity level of 1
Transportation conditions: The device can withstand vibration durability, impact, and collision tests with a severity level of 1
2.11 Environmental conditions
ambient temperature
Work: -10 ℃~+50 ℃
Storage: -25 ℃~+70 ℃. No excitation is applied at the limit value, and the device does not undergo irreversible changes. After the temperature is restored, the device should be able to work normally. The packaged device should be stored in an environment with a relative humidity of no more than 80%
Atmospheric pressure: 80~110kPa (equivalent to an altitude of 2km or below)
Relative humidity: not greater than 90%, no condensation.
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali

YXD-411 Digital Motor Protection and Measurement Device
1 Overview
The YXD-411 digital motor protection and measurement device is suitable for high-voltage motors in 10KV or 6KV low current grounding systems. It is a bay level equipment that completes functions such as protection, measurement, and communication. Its functions are as follows:
1.1 Protection Function
Protection against overcurrent and negative sequence overcurrent;
Blockage protection;
Long startup time protection;
Overcurrent inverse time limit and negative sequence inverse time limit protection;
Overheating protection;
Low voltage protection and voltage reverse phase sequence protection;
Overload alarm;
Low current grounding line selection function: Select fundamental wave for judgment, and send an alarm signal after selecting the line;
Zero sequence current protection function: The zero sequence current is set at 0.05~5A, and the outlet trip or alarm can be selected;
PT disconnection and CT disconnection functions;
1.2 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.3 Event recording, fault recording, and statistical functions
The recorded event content includes protective action events and device self-test faults;
Record the type of protective action event, action time, and operating parameters during the protective action; Record the type and occurrence time of self checking fault events of the device;
The content of fault recording includes: the time of protection action, the type of protection action, and the effective values before and after starting the recording;
The data length of fault recording: 2 cycles before and 4 cycles after the fault in each channel, with a total of 192 points per channel;
1.4 Communication Function
The device sends real-time data, including measurement data, waveform data, fault and alarm signals, as well as all protection settings, control words, system parameters, etc. Remote online modification of settings and activation/deactivation of certain protection functions.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands.
1.5 Monitoring function
The device has telemetry function for measuring analog quantities such as current, voltage, frequency, etc;
Remote signaling function for collecting position signals of circuit breakers, energy storage, isolation switches, remote/local, and other switch signals;
Remote control function for opening and closing circuit breakers and energy storage;.
1.6 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
There is a system status indicator light on the panel.
2 Technical data
2.1 Rated DC
220 V；
The ripple coefficient of DC current voltage is not greater than 2%, and the voltage fluctuation is 80-110% of the rated voltage.
2.2 Rated AC
AC voltage: 100V;
AC current: 5A;
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%;
Frequency: 50Hz, allowable deviation is ± 0.5%.
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation;
After applying 40In for 1 second, there was no insulation damage.
2.4 Power consumption
DC circuit not exceeding 8W;
The AC circuit shall not exceed 0.5VA per phase.
2.5 Output contacts
In an AC circuit with a voltage not exceeding 250V, the contact current capability is 5A (resistive load);
The lifespan of the contact is 1000 times.
2.6 Main Technical Data
2.6.1 Positive sequence current quick break protection, negative sequence current quick break protection, locked rotor protection, zero sequence current protection
2.6.1.1 Action Value
Setting range 1~99.99A; (zero sequence current is 0.05~5A);
Grade difference of 0.1A;
The average error of the accuracy of the action value shall not exceed ± 3%.
2.6.1.2 Action time
Setting range 0~99.99 seconds;
Grade difference of 0.01s;
The accuracy of the action time is measured at twice the action current, and the average error of the action time does not exceed ± 35ms when the setting range is 0~1s.
2.6.2 Overcurrent inverse time limit protection and negative sequence current inverse time limit protection
2.6.2.1 Action Values
Setting range 0.2In~2In;
Grade difference of 0.1A;
The average error of the accuracy of the action value shall not exceed ± 5%
2.6.2.2 Time Characteristics
The consistency of the accuracy of the action time shall not exceed 20ms. When the time range is 0.1~1s, the average error between the action time and the calculation time shall not exceed ± 50ms. When the time range is 1.00~99.99 s, the average error between the action time and the calculation time shall not exceed ± 5%.
2.6.3 Thermal protection function
2.6.3.1 Thermal protection action value
Secondary rated current setting range 0.2In~2In;
Grade difference of 0.1A;
The accuracy consistency of the action value shall not exceed 5% of the action value; The average error shall not exceed ± 5%
The setting range of the thermal alarm coefficient is 0.10~1.00, with a difference of 0.01 and an error not exceeding ± 10%
2.6.3.2 Thermal protection action time
The accuracy of action time should not exceed ± 50ms when the time range is 0.1~1s, and the average error between action time and calculation time should not exceed ± 5% when the action time is greater than 1s.
2.6.4 Overload protection function
2.6.4.1 Action Values
Setting range 0.2In~2In; (Zero sequence current is 0~5A);
Grade difference of 0.1A;
The average error of the accuracy of the action value shall not exceed ± 5%
2.6.4. 2 Time Characteristics
The accuracy of the action time is measured at twice the action current, with an average error of no more than ± 35ms.
2.6.5 Low voltage protection
2.6.5.1 Low voltage protection action value
Setting range: 20V~100V;
Grade difference: 1V;
Accuracy of action values: Consistency shall not exceed 3% of action values, and the average error shall not exceed ± 3%.
2.6.5.2 Low voltage protection action time
Setting range: 0~99.99 seconds;
Grade difference: 0.01s;
Accuracy of action time: The average error of action time does not exceed ± 35ms.
2.6.6 Voltage Reverse Phase Sequence Protection
When the line voltage is higher than the low voltage protection setting, if the negative sequence voltage is greater than twice the positive sequence voltage, the trip will be delayed.
Voltage reverse phase sequence protection action time
Setting range: 0~99.99 seconds;
Grade difference: 0.01s;
Accuracy of action time: The average error of action time does not exceed ± 35ms.
2.6.7 Protection against Long Startup Time
When the current is greater than the current setting value, it is considered that the motor has started. After the start delay, if 1.5Ie
2.7 Telemetry accuracy:
U. I is at level 0.2
P. Q is at level 0.5
2.8 Remote signaling resolution
No more than 2ms
2.9 Insulation performance
2.9.1 Insulation resistance
The insulation resistance of each conductive circuit of the device between the exposed non charged metal parts and the shell, as well as between different circuits that are not electrically connected, should be measured using an open circuit voltage testing instrument of 500V, and should not be less than 500M Ω.
2.9.2 Dielectric Strength
The dielectric strength of all circuits and enclosures of the device can withstand AC 50Hz, voltage 2KV (effective value), and conduct a 1-minute experiment without insulation breakdown or flashover phenomenon. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
Table 1
Test location
1. The same set of contacts in the communication circuit are connected to the ground
Voltage withstand level at power frequency 2kV (effective value)
2. Between communication circuits
The withstand voltage level is the same as above
3. Between AC and DC circuits
The withstand voltage level is the same as above
4. DC power supply circuit to ground
The withstand voltage level is the same as above
5. Between the same set of contacts
Voltage withstand level 1kV (effective value)
2.10 Impulse voltage
The conductive part of the device can withstand a standard lightning wave short-term impulse test with an amplitude of 5kV between the exposed non-conductive metal part shell under the specified test atmospheric conditions.
2.11 Anti interference capability
The device can withstand pulse interference tests with frequencies of 1MHz and 100kHz attenuated oscillation waves (the first half wave voltage amplitude is 2.5kV for common mode and 1kV for differential mode) as specified in GB/T14598.13;
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14;
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9;
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10;
2.12 Mechanical Properties
Working conditions: The device can withstand vibration response and impact response tests with a severity level of 1;
Transportation conditions: The device can withstand vibration durability, impact, and collision tests with a severity level of 1;
2.13 Environmental conditions
ambient temperature
Work: -10 ℃~+50 ℃.
Storage: -25 ℃~+70 ℃. No excitation is applied at the limit value, and the device does not undergo irreversible changes. After the temperature is restored, the device should be able to work normally.
Atmospheric pressure: 80~110kPa (equivalent to an altitude of 2km or below).
Relative humidity: not greater than 90%, no condensation.
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali

YXD-412 Digital Motor Differential Protection Device
1 Overview
1.1 Classification of uses of YXD-412 series products:
This device is suitable for high-voltage motors in 10KV or 6KV systems, and together with the YXD-411 motor comprehensive protection and measurement device, it completes the secondary function of the motor compartment.
1.2 Main functions of YXD-412 product:
1.2.1 Protection Function
Differential quick break protection function: phase separated differential quick break protection, with an action time not exceeding 25ms;
Differential protection function: phase separated differential protection (with ratio braking characteristics and neutral side CT ratio adjustment function);
CT disconnection detection and excessive differential current alarm function: Real time detection of CT disconnection, can lock differential protection, and alarm when the current suddenly changes but the differential current is large;
Body protection function
1.2.2 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.2.3 Event recording, fault recording, and statistical functions
The recorded event content includes protective action events and device self-test faults;
Record the type of protective action event, action time, and operating parameters during the protective action; Record the type and occurrence time of self checking fault events of the device;
The content of fault recording includes: the time of protection action, the type of protection action, and the effective values before and after starting the recording;
The data length of fault recording: 2 cycles before and 4 cycles after the fault for six channels, with a total of 192 points for each channel;
1.2.4 Communication function
The device sends real-time data, including measurement data, waveform data, fault and alarm signals, as well as all protection settings, control word system parameters, etc.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands.
1.2.5 Monitoring function
The device has telemetry function for measuring analog quantities such as current;
Remote signaling function for collecting position signals of circuit breakers, energy storage, isolation switches, remote/local, and other switch signals;
Remote control function for opening and closing circuit breakers and energy storage;.
1.2.6 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
2 Technical data
2.1 Rated DC
220 V
The ripple coefficient of DC current voltage shall not exceed 2%, and the voltage fluctuation shall be between 80% and 110% of the rated voltage
2.2 Rated AC
AC current 5A
AC voltage 100V
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%
Frequency 50Hz, allowable deviation is ± 0.5%
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation
No insulation damage after applying 40In for 1 second
2.4 Power consumption
DC power supply circuit not exceeding 8W
DC measurement circuit not exceeding 1W
AC current circuit not exceeding 0.5VA per phase
AC voltage circuit not exceeding 0.5VA per phase
2.5 Output contacts
In an AC circuit with a voltage not exceeding 250V, the contact current capability is 5A (resistive load), and the contact life is 1000 times.
2.6 Protection of Main Technical Data
2.6.1 Differential Quick Break Protection
Setting range 0.2In~10In
The average error of the accuracy of the action time shall not exceed ± 3%; The action time measured at twice the action current is not more than 25ms
2.6.2 Differential Protection
Setting range 0.2In~10In
The average error of the accuracy of the action value shall not exceed ± 3%
The action time measured at twice the action current is not more than 35ms
Ratio braking ratio braking coefficient 0.30~0.70 Ratio braking constant 0.2In~10In
2.7 Remote signaling resolution
No more than 2ms
2.8 Insulation performance
2.8.1 Insulation resistance
The insulation resistance of each conductive circuit of the device between the exposed non charged metal parts and the shell, as well as between different circuits that are not electrically connected, should be measured using an open circuit voltage testing instrument of 500V, and should not be less than 500M Ω.
2.8.2 Dielectric Strength
The device should be able to withstand the test voltage shown in Table 1 for 1 minute without insulation breakdown or flashover. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
Table 1
1. The same set of contacts in the communication circuit are connected to the ground
Voltage withstand level at power frequency 2kV (effective value)
2. Between communication circuits
The withstand voltage level is the same as above
3. Between AC and DC circuits
The withstand voltage level is the same as above
4. DC power supply circuit to ground
The withstand voltage level is the same as above
5. Between the same set of contacts
Voltage withstand level 1kV (effective value)
2.9 Impulse voltage
The AC circuit, DC circuit, and the same set of contacts connected to the terminal of the device are subjected to a short-term impulse voltage test that can withstand standard lightning waves between the AC and DC circuits, with a test voltage of 5KV.
2.10 Anti electrical interference experiment
The device can withstand pulse interference tests with frequencies of 1MHz and 100KHZ attenuated oscillation waves (the first half wave voltage amplitude is 2.5KV for common mode and 1KV for differential mode) as specified in GB/T14598.13
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10
2.11 Mechanical Properties
The device can withstand vibration response with a severity level of 1 and undergo vibration durability testing;
The device is capable of withstanding a harsh level 1 impact response and conducting impact durability tests;
The device can withstand collision tests with a severity level of 1.
2.12 Environmental conditions
Environmental temperature working -10 ℃~+55 ℃
Storage -25 ℃~+70 ℃
Atmospheric pressure 70~106KPa
Relative humidity: The average maximum relative humidity in the wettest month is 95%, and the average minimum temperature in that month is 25 ℃ with no condensation on the surface. When the maximum temperature is 40 ℃, the average maximum relative humidity does not exceed 50%;
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali

YXK-411 Voltage Automatic Switching Device
1 Overview
The YXK-411 voltage automatic switching device, as a subsystem of substation comprehensive automation, mainly realizes the automatic switching and remote switching functions of two sets of bus PT. The characteristics of the device are as follows:
The device is based on a high-performance new type of digital signal processor (DSP), which has fast processing speed and strong computing power.
The unique anti-interference design and advanced surface mount technology make the system highly reliable; Hardware level 2 watchdog ensures that the system can be reset in a timely manner in case of abnormalities; EEPROM with multi rewrite locking function stores coefficients and configurations to ensure that parameters are not mistakenly written.
The large screen Chinese character LCD display and thin film keyboard human-machine interface make debugging more convenient. The panel has indicator lights for operation, alarm, etc.
Real time 32 point AC sampling, software automatic compensation, no adjustable components.
Telemetry function: It can measure the PT voltage of two sets of busbars.
Remote signaling function: The digital signals of the device, as well as the position signals of circuit breakers, isolation switches, etc., are uploaded to the substation level.
Bus PT disconnection and insulation monitoring detection function.
Overvoltage, low voltage, zero sequence overvoltage alarm or trip.
PT automatic switching function, PT remote control switching function.
Communicate with the integrated automation system using fieldbus technology, execute downstream commands, and upload measurement data.
2 General Technical Data
2.1 Rated DC data
220 V；
The ripple coefficient of DC current voltage is not greater than 2%, and the voltage fluctuation is 80-110% of the rated voltage.
2.2 Rated AC data
Rated AC voltage Un: 100V;
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%;
Frequency fn: 50Hz, allowable deviation is ± 0.5%.
2.3 Power consumption
Each protection function module of the DC circuit shall not exceed 8W;
The AC voltage circuit shall not exceed 0.5VA per phase.
2.4 Output contacts
In a DC circuit with a voltage not exceeding 250V, a current not exceeding 0.5A, and a time constant of 5 ± 0.75ms, the breaking capacity of the output contact of the device is 50W, and the long-term allowable current for connection does not exceed 5A.
2.5 Main Technical Data
2.5.1 PT voltage automatic switching, overvoltage protection, low voltage protection
2.5.1.1 Action Value
Setting range 5-120V
Grade difference of 0.01V
The accuracy consistency of the action value shall not exceed 3% of the action value; The average error shall not exceed ± 3%.
2.5.1.2 Action time
Setting range 0~9.99s
Grade difference of 0.01 s
Under the action current of twice the set value, the action delay is set to 0.01s, and the measured action time does not exceed 30ms.
2.5.2 Telemetry accuracy
U 0.2 level;
2.5.3 Remote signaling resolution
Not exceeding 2ms.
2.6 Insulation performance
2.6.1 Insulation resistance
The insulation resistance between all circuits and the casing of the device shall not be less than 500M Ω under standard experimental conditions.
2.6.2 Medium strength
The dielectric strength of all circuits and enclosures of the device can withstand AC 50Hz, voltage 2kV (effective value), and conduct a 1-minute experiment without insulation breakdown or flashover phenomenon. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
2.7 Impulse voltage
The conductive part of the device can withstand a standard lightning wave short-term impulse test with an amplitude of 5kV between the exposed non-conductive metal part shell under the specified test atmospheric conditions.
2.8 Anti interference capability
The device can withstand pulse interference tests with frequencies of 1MHz and 100kHz attenuated oscillation waves (the first half wave voltage amplitude is 2.5kV for common mode and 1kV for differential mode) as specified in GB/T14598.13;
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14;
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9;
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10.
2.9 Mechanical Properties
Working conditions: The device can withstand vibration response and impact response tests with a severity level of 1;
Transportation conditions: The device can withstand vibration durability, impact, and collision tests with a severity level of 1.
2.10 Environmental conditions
ambient temperature
Work: -10 ℃~+50 ℃.
Storage: -25 ℃~+70 ℃. No excitation is applied at the limit value, and the device does not undergo irreversible changes. After the temperature is restored
The device should be able to operate normally.
Atmospheric pressure: 80~110kPa (equivalent to an altitude of 2km or below).
Relative humidity: The average maximum relative humidity in the wettest month is 90%, and the average minimum temperature in that month is 25 ℃ with no condensation on the surface. When the maximum temperature is 40 ℃, the average maximum relative humidity does not exceed 50%; The relative humidity of the packaged device should not exceed 80%.
Other conditions: The air around the device should not contain substances that are corrosive or explosive with acid or alkali.

YXL-4XX digital line protection and measurement device
1 Overview
1.1 YXL-4XX series product usage classification:
The YXL-4XX series digital line protection and measurement device is suitable for small current grounding systems with voltage levels of 66KV and below, or 110KV lines with current and voltage protection. It is a spacing layer equipment for line units.
YXL411 is a two element line protection, while YXL412 is a three element line protection. On the basis of the basic protection function of YXL411, YXL412 has added a reclosing synchronization/no voltage detection function. When the synchronization/no voltage detection function is activated, 3U0 is the calculated value.
1.2 The main functions are as follows:
1.2.1 Protection Function
Three stage low-voltage lockout directional overcurrent protection: Each stage of low-voltage lockout or directional lockout can be individually activated or deactivated;
Three phase automatic reclosing function;
Low frequency load shedding function: Low voltage lockout and low current lockout can be activated or deactivated, and low cycle load shedding outlet trip or alarm can be selected;
Low current grounding line selection function: sends an alarm signal after selecting the line;
Zero sequence current protection function: The zero sequence current is set at 0.2A~5A, and the outlet trip or alarm can be selected;
1.2.2 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.2.3 Event recording, fault recording, and statistical functions
The recorded event content includes protective action events and device self-test faults;
Record the type of protective action event, action time, and operating parameters during the protective action; Record the type and occurrence time of self checking fault events of the device;
The content of fault recording includes: the time of protection action, the type of protection action, and the effective values before and after starting the recording;
The data length of fault recording: 2 cycles before and 4 cycles after the fault in each channel, with a total of 192 points per channel;
1.2.4 Communication function
The device sends real-time data, including measurement data, waveform data, fault and alarm signals, as well as all protection settings, control words, system parameters, etc. Remote online modification of settings and activation/deactivation of certain protection functions.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands.
1.2.5 Monitoring function
The device has telemetry function for measuring analog quantities such as current, voltage, frequency, etc;
Remote signaling function for collecting position signals of circuit breakers, energy storage, isolation switches, remote/local, and other switch signals;
Remote control function for opening and closing circuit breakers and energy storage;
1.2.6 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
2 General Technical Data
2.1 Rated DC data
220 V
The ripple coefficient of DC current voltage is not greater than 2%, and the voltage fluctuation is 80-110% of the rated voltage.
2.2 Rated AC data
Rated AC current In: 5A;
Rated AC voltage Un: 100V;
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%;
Frequency fn: 50HZ, allowable deviation is ± 0.5%.
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation;
After applying 40In for 1 second, there was no insulation damage.
2.4 Power consumption
Each protection function module of the DC circuit shall not exceed 8W;
The AC voltage circuit shall not exceed 0.5VA per phase;
The AC current circuit shall not exceed 0.5VA per phase.
2.5 Output contacts
In a DC circuit with a voltage not exceeding 250V, a current not exceeding 0.5A, and a time constant of 5 ± 0.75ms, the breaking capacity of the output contact of the device is 50W, and the long-term allowable current for connection does not exceed 5A.
2.6 Protection of Main Technical Data
2.6.1 Quick break protection, delayed quick break protection, overcurrent protection, zero sequence current protection
2.6.1.1 Action Value
Setting range 0.5~99.99A; (zero sequence current is 0.2~5A)
The average error of the accuracy of the action value shall not exceed ± 3%
2.6.1.2. Action time
Setting range 0~120.00s
The accuracy of the action time is measured at twice the action current, and the average error of the action time does not exceed ± 35ms
2.6.1.3 Phase direction function
Sensitivity angle -30 °, average error not exceeding ± 5 °, consistency not exceeding 5 °
Action area 160 , with an average error not exceeding ± 5 
2.6.1.4 Low voltage lockout function
The setting range is 5V~100V, with a setting level difference of 1V and an error not exceeding ± 3%
2.6.2 Recloser Function
Protection with three-phase primary reclosing function
Recloser delay time: Setting range 0.1~120.00s
The average error of action time does not exceed ± 35ms
2.6.3 Rear Acceleration Function
The first, second, and third stages have optional rear acceleration functions
There are separate control words for acceleration after each segment to activate and deactivate
Post acceleration delay time: Setting range 0~3s
The average error of action time does not exceed ± 35ms
2.6.4 Low frequency load shedding function
2.6.4.1 Low frequency load shedding frequency
Setting range: 46 Hz~50 Hz
Grade difference: 0.01 Hz
Accuracy of action values: consistency not greater than 0.01 Hz; average error not exceeding ± 0.02 Hz
2.6.4.2 Low voltage lockout and low-frequency load shedding
Setting range: 5V~100V
Grade difference: 1V
Accuracy of action values: average error not exceeding ± 3%
2.6.4.3 Low frequency load shedding with small current blocking
Setting range: 0.2A~10A
Accuracy of action values: average error not exceeding ± 5%
2.6.4.4 Slip locking low-frequency load shedding
Setting range: Δ F0~10 Hz; Δ T is fixed at 0.5 s
Grade difference: Δ F0.01 Hz
Accuracy of action values: average error not exceeding ± 0.05 Hz/s
2.6.4.5 Low frequency load shedding action time
Setting time: 0.1~120.00 seconds
Accuracy of action time: The average error of action time does not exceed ± 35ms
2.6.5 Small current grounding line selection function
Apply zero sequence voltage and current exceeding the set value using the fundamental wave. When the zero sequence voltage leads the zero sequence current by between 10  and 170 , it is judged as low current grounding, and the boundary error does not exceed ± 5 ; Sensitivity angle+90 °.
2.6.6 Telemetry accuracy
U. I 0.2 level
P. Q Level 0.5
2.6.7 Remote signaling resolution
No more than 2ms
2.7 Insulation performance
2.7.1 Insulation resistance
The insulation resistance between all circuits and the casing of the device shall not be less than 500M Ω under standard experimental conditions.
2.7.2 Medium strength
The dielectric strength of all circuits and enclosures of the device can withstand AC 50Hz, voltage 2kV (effective value), and conduct a 1-minute experiment without insulation breakdown or flashover phenomenon. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
2.8 Impulse voltage
The conductive part of the device can withstand a standard lightning wave short-term impulse test with an amplitude of 5kV between the exposed non-conductive metal part shell under the specified test atmospheric conditions.
2.9 Anti interference capability
The device can withstand the pulse interference test of attenuated oscillation waves with frequencies of 1MHz and 100kHz as specified in GB/T14598.13 (the first half wave voltage amplitude is 2.5kV for common mode and 1kV for differential mode)
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10
2.10 Mechanical Properties
Working conditions: The device can withstand vibration response and impact response testing with a severity level of 1
Transportation conditions: The device can withstand vibration durability, impact, and collision tests with a severity level of 1
2.11 Environmental conditions
ambient temperature
Work: -10 ℃~+50 ℃
Storage: -25 ℃~+70 ℃. No excitation is applied at the limit value, and the device does not undergo irreversible changes. After the temperature is restored, the device should be able to work normally. The packaged device should be stored at a relative humidity atmospheric pressure of 80-110kPa (equivalent to an altitude of 2km or below)
Relative humidity: not greater than 90%, no condensation.
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali

YXR-411 Digital Integrated Measurement and Control Device
1 Overview
The functions of the YXR-411 measurement and control device are as follows:
1.2 The main functions are as follows:
1.2.1 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.2.2 Event recording function
The recorded event content includes protective action events and device self-test faults;
1.2.3 Communication function
The device sends real-time data, including measurement data, all protection settings, control words, system parameters, etc. Remote online modification of fixed values and activation/deactivation of certain functions.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands.
1.2.4 Monitoring function
The device has telemetry function for measuring analog quantities such as current, voltage, frequency, etc;
Collect three channels of DC signals, which can be displayed as DC or temperature can be adjusted through control words;
Remote signaling function for collecting position signals of circuit breakers, energy storage, isolation switches, remote/local, and other switch signals;
Remote control function for opening and closing circuit breakers and energy storage;
1.2.5 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
There is a system status indicator light on the panel.
2 Technical data
2.1 Rated DC
220 V; (power supply)
The ripple coefficient of DC current voltage is not greater than 2%, and the voltage fluctuation is 80-110% of the rated voltage.
Input range for DC acquisition: 0~5V.
2.2 Rated AC
AC voltage: 100V;
AC current: 5A;
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%;
Frequency: 50Hz, allowable deviation is ± 0.5%.
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation;
After applying 40In for 1 second, there was no insulation damage.
2.4 Power consumption
DC circuit not exceeding 8W;
The AC circuit shall not exceed 0.5VA per phase.
2.5 Output contacts
In an AC circuit with a voltage not exceeding 250V, the contact current capability is 5A (resistive load);
The lifespan of the contact is 1000 times.
2.6 Telemetry accuracy:
U. I is at level 0.2
P. Q is at level 0.5
2.7 Remote signaling resolution
No more than 2ms
2.8 Insulation performance
2.8.1 Insulation resistance
The insulation resistance of each conductive circuit of the device between the exposed non charged metal parts and the shell, as well as between different circuits that are not electrically connected, should be measured using an open circuit voltage testing instrument of 500V, and should not be less than 500M Ω.
2.8.2 Dielectric Strength
The dielectric strength of all circuits and enclosures of the device can withstand AC 50Hz, voltage 2KV (effective value), and conduct a 1-minute experiment without insulation breakdown or flashover phenomenon. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
Table 1
1. The same set of contacts in the communication circuit are connected to the ground
Voltage withstand level at power frequency 2kV (effective value)
2. Between communication circuits
The withstand voltage level is the same as above
3. Between AC and DC circuits
The withstand voltage level is the same as above
4. DC power supply circuit to ground
The withstand voltage level is the same as above
5. Between the same set of contacts
Voltage withstand level 1kV (effective value)
2.9 Impulse voltage
The conductive part of the device can withstand a standard lightning wave short-term impulse test with an amplitude of 5KV between the exposed non-conductive metal parts and the outer shell under the specified test atmospheric conditions.
2.10 Anti interference capability
The device can withstand pulse interference tests with frequencies of 1MHz and 100KHZ attenuated oscillation waves (the first half wave voltage amplitude is 2.5KV for common mode and 1KV for differential mode) as specified in GB/T14598.13;
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14;
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9;
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10;
2.11 Mechanical Properties
Working conditions: The device can withstand vibration response and impact response tests with a severity level of 1;
Transportation conditions: The device can withstand vibration durability, impact, and collision tests with a severity level of 1;
2.12 Environmental conditions
ambient temperature
Work: -10 ℃~+50 ℃.
Storage: -25 ℃~+70 ℃. No excitation is applied at the limit value, and the device does not undergo irreversible changes. After the temperature is restored, the device should be able to work normally.
Atmospheric pressure: 80~110KPa (equivalent to an altitude of 2km or below).
Relative humidity: not greater than 90%, no condensation.
Other conditions: The air around the device should not contain substances that are corrosive or explosive with acid or alkali.

YXT-411 digital transformer differential protection device
1 Overview
This device is suitable for use as a differential and main protection for substations with voltage levels of 110KV and below. Its functions are as follows:
1.1 Protection Function
Differential quick break protection function: phase separated differential quick break protection, with an action time not exceeding 25ms;
Differential protection function: phase separated differential protection (with harmonic braking, ratio braking characteristics, and low-voltage side CT ratio adjustment function);
CT disconnection detection and excessive differential current alarm function: Real time detection of CT disconnection, can lock differential protection, and alarm when the current suddenly changes but the differential current is large;
Main body protection functions: heavy gas action, pressure regulating heavy gas action, light gas alarm, pressure regulating light tile alarm;
Activate ventilation function: When the B-phase current on the high-voltage side is greater than the set value of the ventilation current, activate the ventilation outlet.
1.2 Self checking function of the device
The device automatically detects faults such as RAM, ROM, A/D, and power loss;
Automatically detect parameters such as settings, configurations, and coefficients;
1.3 Event recording, fault recording, and statistical functions
The recorded event content includes protective action events and device self-test faults;
Record the type of protective action event, action time, and operating parameters during the protective action; Record the type and occurrence time of self checking fault events of the device;
The content of fault recording includes: the time of protection action, the type of protection action, and the effective values before and after starting the recording;
The data length of fault recording: 2 cycles before and 4 cycles after the fault for five channels, with a total of 192 points for each channel;
1.4 Communication Function
The device sends real-time data, including measurement data, waveform data, fault and alarm signals, as well as all protection settings, control word system parameters, etc.
Receive control commands issued by superiors, including system timing, constant value setting, and data read/write commands.
1.5 Monitoring function
Remote signaling function for collecting position signals of circuit breakers, energy storage, isolation switches, remote/local, and other switch signals;
Remote control function for opening and closing circuit breakers and energy storage.
1.6 Display Function
The panel has a large Chinese character LCD display and keyboard operation, which can easily achieve measurement tracking and monitoring, online modification of fixed values, or switching on/off certain protection functions.
2 Technical data
2.1 Rated DC
220 V
The ripple coefficient of DC current voltage shall not exceed 2%, and the voltage fluctuation shall be between 80% and 110% of the rated voltage
2.2 Rated AC
AC current 5A
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%
Frequency 50Hz, allowable deviation is ± 0.5%
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation
No insulation damage after applying 40In for 1 second
2.4 Power consumption
DC power supply circuit not exceeding 8W
The AC current circuit shall not exceed 0.5VA per phase
2.5 Output contacts
In an AC circuit with a voltage not exceeding 250V, the contact current capability is 5A (resistive load), and the contact life is 1000 times.
2.6 Protection of Main Technical Data
2.6.1 Differential Quick Break Protection
Setting range 1~99.99A
Grade difference of 0.01A
The average accuracy error of action time shall not exceed ± 3%; The action time measured at twice the action current is not more than 25ms
2.6.2 Differential Protection
Setting range 1~99.99A
Grade difference of 0.01A
The accuracy consistency of the action value shall not exceed 3% of the action value; The average error shall not exceed ± 3%
The action time measured at twice the action current is not more than 30ms
Ratio braking ratio braking coefficient 0.30~0.70 Ratio braking constant 0.2In~10In
Harmonic braking harmonic braking coefficient 0.10~0.70
2.6.3 Activate ventilation function
2.6.4 Starting ventilation current setting
Setting range 1~99.99A
Grade difference of 0.01A
The accuracy consistency of the action value shall not exceed 3% of the action value; The average error shall not exceed ± 3%
2.6.5 Start ventilation action time
Setting range 0~9.99s
Grade difference of 0.01s
The accuracy of action time has an average error of no more than ± 30ms.
2.7 Telemetry accuracy:
Level 0.2
2.8 Remote signaling resolution
No more than 2ms
2.9 Insulation performance
2.9.1 Insulation resistance
The insulation resistance of each conductive circuit of the device between the exposed non charged metal parts and the shell, as well as between different circuits that are not electrically connected, should be measured using an open circuit voltage testing instrument of 500V, and should not be less than 500M Ω.
2.9.2 Dielectric Strength
The device should be able to withstand the test voltage shown in Table 1 for 1 minute without insulation breakdown or flashover. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
1. The same set of contacts in the communication circuit are connected to the ground
Voltage withstand level at power frequency 2kV (effective value)
2. Between communication circuits
The withstand voltage level is the same as above
3. Between AC and DC circuits
The withstand voltage level is the same as above
4. DC power supply circuit to ground
The withstand voltage level is the same as above
5. Between the same set of contacts
Voltage withstand level 1kV (effective value)
2.10 Impulse voltage
The AC circuit, DC circuit, and the same set of contacts connected to the terminal of the device are subjected to a short-term impulse voltage test that can withstand standard lightning waves between the AC and DC circuits, with a test voltage of 5KV.
2.11 Anti electrical interference experiment
The device can withstand pulse interference tests with frequencies of 1MHz and 100KHZ attenuated oscillation waves (the first half wave voltage amplitude is 2.5KV for common mode and 1KV for differential mode) as specified in GB/T14598.13.
The device can withstand the strict level IV electrostatic discharge interference test specified in GB/T14598.14.
The device can withstand the harsh level III electromagnetic field interference test specified in GB/T14598.9.
The device can withstand the rapid transient interference test with a severity level of IV as specified in GB/T14598.10.
2.12 Mechanical Properties
The device can withstand vibration response with a severity level of 1 and undergo vibration durability testing.
The device can withstand a severe level 1 impact response and undergo impact durability testing.
The device can withstand collision tests with a severity level of 1.
2.13 Environmental conditions
Environmental temperature working -10 ℃~+55 ℃
Storage -25 ℃~+70 ℃
Atmospheric pressure 80~110KPa
Relative humidity: The average maximum relative humidity in the wettest month is 90%, and the average minimum temperature in that month is 25 ℃ with no condensation on the surface. When the maximum temperature is 40 ℃, the average maximum relative humidity does not exceed 50%;
Other conditions: The air around the device should not contain substances that are corrosive or explosive with acid or alkali.

YXZ-411 Digital Backup Power Automatic Switching Device
1. Overview
The YXZ-411 digital backup power automatic switching device is a segmented backup automatic switching device that can quickly and automatically disconnect the power-off circuit breaker and close the bus tie circuit breaker after the working power supply fails or is disconnected for other reasons. YXZ-411 adopts embedded digital signal processing technology (DSP) and fieldbus technology, with the same hardware structure and different software, which can meet the requirements of backup power supply for various main wiring substations.
2. Technical documentation
2.1 Rated DC (or AC)
220 V
The ripple coefficient of DC current voltage is not greater than 2%, and the voltage fluctuation is 80-110% of the rated voltage.
2.2 Rated AC
AC current 5A
AC voltage 100V (line voltage)
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%
Frequency 50HZ, allowable deviation is ± 0.5%
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation
No insulation damage after applying 40In for 1 second
2.4 Power consumption
DC circuit not exceeding 8W
The AC circuit shall not exceed 0.5VA per phase
2.5 Output contacts
In an AC circuit with a voltage not exceeding 250V, the contact current capability is 5A (resistive load). The contact life is 1000 times
2.6 Action values for quick break protection, delayed quick break protection, and overcurrent break protection:
Setting range 1~99.99A;
Grade difference of 0.01A;
The accuracy consistency of the action value shall not exceed 3% of the action value; The average error shall not exceed ± 3%;
2.7 Action time of quick break protection, delayed quick break protection, and overcurrent break protection.
Setting range 0~9.99S;
Grade difference of 0.01 seconds;
The accuracy of action time is measured at twice the action current, with a consistency of no more than 20ms and an average error of no more than ± 30ms.
2.8 Segmented backup automatic switching protection check no pressure action value
The setting range is 10~70V;
The accuracy consistency of the action value shall not exceed 3% of the action value; The average error shall not exceed ± 3%.
2.9 Segmented backup automatic switching protection action time
Setting range 0.1~9.99s;
When the voltage drops suddenly to 90% of the set value during the action time, the measured action time does not exceed 30ms.
2.10 Remote signaling resolution
No more than 2ms
2.11 Insulation performance
2.11.1 Insulation resistance
The insulation resistance of each conductive circuit of the device between the exposed non charged metal parts and the shell, as well as between different circuits that are not electrically connected, should be measured using an open circuit voltage testing instrument of 500V, and should not be less than 500M Ω.
2.11.2 Dielectric Strength
The device should be able to withstand the test voltage shown in Table 3 for 1 minute without insulation breakdown or flashover. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
Table 3
1. The same set of contacts in the communication circuit are connected to the ground
Voltage withstand level at power frequency 2kV (effective value)
2. Between communication circuits
The withstand voltage level is the same as above
3. Between AC and DC circuits
The withstand voltage level is the same as above
4. DC power supply circuit to ground
The withstand voltage level is the same as above
5. Between the same set of contacts
Voltage withstand level 1kV (effective value)
2.12 Impulse voltage
The AC circuit, DC circuit, and the same set of contacts connected to the terminal of the device are subjected to a short-term impulse voltage test that can withstand standard lightning waves between the AC and DC circuits, with a test voltage of 5kV.
2.13 Anti electrical interference experiment
The device can withstand interference tests with frequencies of 1MHz and 100kHz, repetition rates of 300-500 wave groups/second and 50 wave groups/second, and a common mode interference test voltage of 2.5kV and a differential mode interference test voltage of 1kV.
2.14 Mechanical Properties
The device can withstand vibration response with a severity level of 1 and undergo vibration durability testing
The device can withstand a severe level 1 impact response and undergo impact durability testing
The device can withstand collision tests with a severity level of 1
2.15 Environmental conditions
ambient temperature
Working temperature -10 ℃~+50 ℃
Storage temperature -25 ℃~+70 ℃
Atmospheric pressure 80~110KPa
Relative humidity not exceeding 90%, no condensation
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali

YXZ-413 incoming line backup automatic switching device
1. Overview
The YXZ-413 incoming backup automatic switching device can quickly and automatically put the backup power supply or backup equipment into operation after the main power supply fails or is disconnected for other reasons, achieving mutual switching function. In addition, when the main power supply is re energized, the backup power supply can be disconnected and the main power supply can be put into operation. YXZ-413 adopts embedded digital signal processing technology (DSP) and fieldbus technology, and with the same hardware structure and different software, it can meet the requirements of backup power supply for various main wiring substations.
2. Technical documentation
2.1 Rated DC (or AC)
220 V
The ripple coefficient of DC current voltage shall not exceed 2%, and the voltage fluctuation shall be between 80% and 110% of the rated voltage
2.2 Rated AC
AC current 5A
AC voltage 100V (line voltage)
The waveform of the AC power supply is a sine wave with a distortion coefficient not exceeding 2%
Frequency 50HZ, allowable deviation is ± 0.5%
2.3 Overload Capacity of AC Circuit
Apply 1.2In~2In device for sustainable operation
No insulation damage after applying 40In for 1 second
2.4 Power consumption
DC circuit not exceeding 8W
AC circuit not exceeding 0.5VA per phase
2.5 Output contacts
In an AC circuit with a voltage not exceeding 250V, the contact current capability is 5A (resistive load). The contact life is 1000 times
2.6 Backup automatic protection check no pressure action value
Setting range 10~70V
The accuracy consistency of the action value shall not exceed 3% of the action value; The average error shall not exceed ± 3%
2.7 Backup automatic switching protection action time
Setting range 0.1~9.99s
When the voltage drops sharply to 90% of the set value during the action time, the measured action time does not exceed 30ms
2.8 Remote signaling resolution
No more than 2ms
2.9 Insulation performance
2.9.1 Insulation resistance
The insulation resistance of each conductive circuit of the device between the exposed non charged metal parts and the shell, as well as between different circuits that are not electrically connected, should be measured using an open circuit voltage testing instrument of 500V, and should not be less than 500M Ω.
2.9.2 Dielectric Strength
The device should be able to withstand the test voltage shown in Table 3 for 1 minute without insulation breakdown or flashover. When rechecking the dielectric strength, the test voltage value is 75% of the specified value.
Table 3
1. The same set of contacts in the communication circuit are connected to the ground
Voltage withstand level at power frequency 2kV (effective value)
2. Between communication circuits
The withstand voltage level is the same as above
3. Between AC and DC circuits
The withstand voltage level is the same as above
4. DC power supply circuit to ground
The withstand voltage level is the same as above
5. Between the same set of contacts
Voltage withstand level 1kV (effective value)
2.10 Impulse voltage
The AC circuit, DC circuit, and the same set of contacts connected to the terminal of the device are subjected to a short-term impulse voltage test that can withstand standard lightning waves between the AC and DC circuits, with a test voltage of 5kV.
2.11 Anti electrical interference experiment
The device can withstand interference tests with frequencies of 1MHz and 100kHz, repetition rates of 300-500 wave groups/second and 50 wave groups/second, and a common mode interference test voltage of 2.5KV and a differential mode interference test voltage of 1kV.
2.12 Mechanical Properties
The device can withstand vibration response with a severity level of 1 and undergo vibration durability testing
The device can withstand a severe level 1 impact response and undergo impact durability testing
The device can withstand collision tests with a severity level of 1
2.13 Environmental conditions
ambient temperature
Working temperature -10 ℃~+50 ℃
Storage temperature -25 ℃~+70 ℃
Atmospheric pressure ranging from 80 to 110kPa
Relative humidity not exceeding 90%, no condensation
Other conditions: The air around the device should not contain any corrosive or explosive substances with acid or alkali