Chengji High Voltage Automatic Switching Reactive Power Compensation Device

Product Details

a. Combining capacitor banks of varying capacities to achieve intelligent control and reasonable compensation of reactive power;

b. Selecting vacuum contactors to switch capacitors, saving construction investment, and implementing miniaturization and combination of products;

c. High quality capacitors and reactors are matched with optimized parameters to create favorable operating conditions;

d. Adopting high-voltage fuse and relay protection to ensure the safety and reliability of the device;

e. Install electromagnetic locks and travel switch devices for cabinet doors to protect personal and equipment safety;

f. Universalization of structural forms to meet the needs of various places;

g. Improve the utilization rate of capacitor devices from 58-63% without grouping to 83-85%.

h. The fixed high-voltage parallel compensation device is a compensation device in which capacitors are directly connected to the power grid in a certain group.

　　Environmental conditions for use

The altitude shall not exceed 1000 meters. For devices installed and operated at an altitude exceeding 1000 meters, special instructions should be provided when ordering.

The ambient temperature at the installation and operation location shall not exceed -25 ℃ to+45 ℃, and the rest shall not exceed -25 ℃ to+45 ℃.

There are no explosive or flammable materials in the surrounding medium, no gases that can damage insulation or corrode metals, and no conductive dust.

The installation location is free from severe vibrations and bumps.

This device is an indoor type.

　　The device allows for capacitance deviation

The difference between the measured total capacity of the entire capacitor bank and the sum of the rated capacities of each capacitor shall not exceed 0 to+10%, and the deviation of each phase capacitance shall not exceed+2%.

　　Operating conditions

The device operates in a state not exceeding 1.1Un.

The device operates in a state not exceeding 1.3In.

Device protection;

When the capacitor bank adopts a single star connection, the protection method adopts open delta zero sequence voltage protection. When the capacitor bank adopts a double star connection, the protection method adopts neutral unbalanced overcurrent protection. The protection signals of capacitor groups are all connected to the main switch, and the fault is cut off by the main switch, while the vacuum contactor is only used for switching and not for protection.

The voltage and current analog signals of the segmented power factor controller are taken from the bus power supply side, and the monitoring information is processed, analyzed, and judged. The controller issues instructions to the vacuum contactor for switching.

External fuse and internal fuse (if necessary) protection for a single capacitor;

Lightning arrester as overvoltage protection;

Each cabinet is equipped with control circuit interlocks (if necessary);

Equipped with alarm devices; Adopting a live display device and equipped with an electromagnetic lock; In an electrified state, the cabinet door can be forcefully closed to prevent it from being opened, ensuring the safety of maintenance personnel.

　　typeNumber Description

1. The meaning of device model HVSCZ10- □ - □/□ - □□ □:

HVSC High Voltage Parallel Capacitor Complete Equipment

Z - Automatic Parallel Device

10- Chengji Electrical Design Number

- Rated voltage of the device (kV)

-Rated total capacity of the device (kvar)

- Number of capacitor groups

- W: Adopting microcomputer protection, suitable for various types of protection of capacitor banks, A represents single star connection, B represents double star connection

The protection method of the device, K represents open delta protection, L represents neutral point unbalanced current protection, and C represents differential voltage protection

　　product structure

1. This device is a fully enclosed cabinet structure, consisting of an incoming cabinet and a capacitor cabinet. The incoming cabinet consists of interfaces with the user's primary and secondary cable incoming lines, as well as an intelligent controller for high-voltage reactive power compensation. The capacitor cabinet consists of high-voltage vacuum contactor (Q), high-voltage zinc oxide lightning arrester (Fv), high-voltage parallel capacitor (C) and its dedicated fuse (FU), discharge coil (TV), reactor (L), etc. (Fixed type with only capacitor cabinet or with capacitor cabinet, reactance cabinet, and discharge cabinet for large capacity)

2. High voltage zinc oxide lightning arrester is connected to the capacitor bank circuit to limit the operating overvoltage caused by switching the capacitor bank.

3. High voltage fuses are connected in series with capacitors. When a short circuit fault occurs in the capacitor, the fuse will activate and quickly cut off the faulty capacitor group, effectively preventing the fault from expanding.

4. The discharge coil is connected to both ends of the capacitor and fuse. When the power supply of the capacitor group is disconnected, the residual voltage at both ends of the capacitor can be reduced from the peak voltage to 0.1 times the rated voltage or below 50V within 5 seconds.

5. A series reactor is connected in series in a capacitor circuit to suppress high-order harmonics and limit closing inrush current.

5.1 When used to suppress harmonics of 5th and 7th order or higher, the reactor can be configured with XL/XC=4.5%~6%.

When used to suppress harmonics of 3 or more, the reactor can be configured with XL/XC=12%~13%.

5.3 Only used to limit the inrush current during closing, the reactor can be configured with XL/XC=0.1~1%.

6. Vacuum contactors are used for switching capacitor banks.

7. The intelligent controller for high-voltage reactive power compensation can be found in its user manual.

　　Installation Instructions

1. Before installation, open the packaging box to check if all components and related random files are complete.

2. Installation should be carried out according to the principle diagram and assembly diagram, vertically installed on the ground embedded foundation, with an inclination of no more than 5 °.

3. It is strictly prohibited to climb or pull the bushing during the installation of capacitors.

4. The busbar connecting capacitors must use flexible wires, and the capacitor layout should have nameplates facing outward for easy inspection.

5. The newly installed capacitor device should be cleaned in all parts before being put into operation, and after running for a period of time, the device should also be regularly cleaned of dirt.

6. The current carrying capacity of the incoming busbar must comply with the specifications.

　　Debugging instructions

1. Check if the CT transformation ratio is appropriate.

2. Check whether the cable/busbar is reliably connected and whether the current carrying capacity meets the specifications.

3. Check the connections and fuses between the protective components, and whether the safety electromagnetic lock (if any) is reliably connected.

4. When setting parameters in the controller (refer to various controller manuals), fixed type is not required.

5. Setting up

1) CT settings

2) CosQ Settings

3) Capacity kVAR setting for each group

4) Overvoltage and overcurrent settings

5) Special parameters (if necessary) such as harmonic protection, temperature protection, and other settings.

6) Other settings (refer to various controller manuals)

6. Power on

1) Close the cabinet door

2) Connect the secondary control power supply

3) Close the electromagnetic lock

4) Close the isolation switch (knife switch) (if any) - the fixed type has entered operation

5) Perform manual operation for each circuit (fixed type not required)

6) Perform automatic operation for each circuit (fixed type not required)

7. Put into operation

　　Operation and maintenance

1. Newly installed or devices that have been out of use for a long time must undergo a voltage withstand test before use, and the capacitance should be checked before and after the test; If there is a significant change in electrical capacity, it cannot be put into use until the cause is identified and addressed before it can be put into use.

2. Before the device is put into operation, a megohmmeter should be used to measure whether the discharge circuit is in good condition.

3. When the device is put into operation, it should be inspected daily. If any abnormalities such as obvious swelling or oil leakage are found in the capacitor box shell, it should be stopped from use and the cause should be identified and dealt with before it can be put into operation.

4. After the device is powered off, although the capacitors discharge through the discharge circuit, a dedicated grounding wire must be hung and the two terminals of each capacitor must be short circuited before maintenance personnel can come into contact and maintain them.

5. After the capacitor bank is disconnected from the circuit, it cannot be reconnected within three minutes.

6. The newly installed device should be cleaned before being put into operation, and after running for a period of time, the device should also be regularly cleaned of dirt.

7. Vacuum switch maintenance content: inspect and adjust the opening and closing positions, speed, stroke, overtravel, etc., check the fastening screws, nut mechanism, transmission parts, and clean the surface of insulation parts. Maintenance content: Replace worn parts or vacuum arc extinguishing chambers, readjust mechanical characteristics, and should be carried out under the guidance of the manufacturer.

　　Interlocking instructions:

1. Isolation switch and circuit breaker

a. The circuit breaker can only be closed when the isolation switch is closed

b. The isolation switch can only be opened and closed after the circuit breaker is opened

2. Circuit breakers and incoming cabinet doors

a. The circuit breaker can only be opened when the cabinet door is separated

b. The wire cabinet door cannot be opened when the circuit breaker is closed

3. Capacitor cabinet door and other contactors

a. Close the front and rear doors of the capacitor cabinet. Only vacuum contactors can be opened and closed

b. After the vacuum contactor is separated, the capacitor cabinet door can be opened. If the cabinet door is opened with the emergency key, the vacuum contactor will trip.

4. Protection trip

When the capacitor fails, the feeder cabinet circuit breaker will trip.