Product Categories

Nanjing Kaijite Electric Co., Ltd

E-mail
Phone
Address
A-229 Longtan Logistics Base, No.1 Shugang Road, Nanjing Economic and Technological Development Zone

High voltage intelligent grounding box online dynamic monitoring

NegotiableUpdate on 05/21

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

Product Details

110kV and above high-voltage cables mainly use single core cables, and their metal sheaths are generally connected at one end and directly grounded, while the other end is grounded through a protective layer protector. These interconnection wires, protective layer protectors, etc. are assembled in one box, namely the cable grounding box.
Grounding boxes are divided into three types: direct grounding boxes, cross connected grounding boxes, and protective grounding boxes, and have been widely used.

The grounding box has the following issues during use:

Lack of circulation detection and induced voltage monitoring functions.

The use of manual inspection has a long cycle and cannot detect problems in a timely manner, missing the best opportunity for repair.

There are many incidents of grounding wire theft and cutting.

Once the grounding wire is damaged or stolen, the voltage of the metal sheath will become a floating voltage, which may exceed the power frequency withstand voltage of the cable outer sheath and cause breakdown. The stolen grounding box is difficult to detect in a short period of time.

The lack of cable joint temperature is unpredictable.

Due to damage to the cable protective layer and other reasons, the cable temperature is too high, which affects the safety of the circuit.

The cable trench environment is complex and lacks real environmental data.

The garbage in the cable trench is easily decomposed by microorganisms to produce combustible gases such as methane, which poses a great hidden danger to the operation of high-voltage cables; Cable trenches are prone to water accumulation, and running cables in a flooded state can seriously affect cable insulation and service life.

according toTechnical Standard for Grounding Boxes for Cable LinesAnd in accordance with the on-site operation requirements, the design of the intelligent grounding box for cable protection layer has been completed. The entire system consists of the following parts:

Intelligent grounding box for cable sheath
• Solar panels and energy storage batteries
• Protective layer protector
Voltage, current, and temperature sensors
Sound and light alarm
External sensor (optional)
• Gas sensors: oxygen, methane, etc
Access control, water immersion, human body sensing
management platform
• Personnel management, equipment management
• Data collection, data

Technical parameter name	Main technical parameters and indicators	Remarks
power supply method	AC220V power supply	In this mode, the distribution box is equipped with a battery (12V/20AH). Solar panels can simultaneously supply power to batteries and smart terminals.
	12V solar panel power supply
contact method	Wired: Ethernet Modbus RTU(RS485)
	Wireless: 4G
4-channel loop current detection	AC 0~5mA ±0.5%	Through CT access, CT transformation ratio is optional
4-channel induced voltage detection	AC 0~400V ±0.5%	Through PT access, PT transformation ratio is optional
4-channel temperature detection	-55℃-125℃，±1℃
Ambient temperature and humidity	Temperature: -40 ℃ -80 ℃, ± 0.5 ℃
	Humidity: 0-99% RH, 0.2% RH
4-channel analog input	Detection range: 4-20mA	It can be connected to universal sensors, including oxygen sensors, harmful gas sensors, combustible gases, etc.
	Detection accuracy: 1%
4-channel dry contact input	Dry contact input	Can be connected to universal sensors, including access control, water immersion, motion monitoring sensors, etc
4-channel dry contact output	Dry contact output, rated load capacity 24V/1A	1 channel connected to sound and light alarm; The remaining 3 channels can be expanded

Lithium battery+solar power supply, stable power supply
Real time monitoring of circulation, induced voltage, protective layer temperature and other data
Real time monitoring of oxygen, harmful gases, flammable gases, and other conditions
Real time monitoring of access control, water immersion, personnel status, etc
All states can be set with an alarm for exceeding the limit. If an alarm occurs, immediately notify the responsible person for handling
Alarm threshold configuration, SMS notification configuration
• Equipment information configuration (location
• Cloud/IoT functionality

Remote data monitoring and display

Metal protective layer circulation monitoring system

The A, B, C, and N phases in the direct grounding box and cross interconnection box are all equipped with electromagnetic current transformers, which monitor the current signals on the three-phase metal sheath in real time and transmit them to the management platform through intelligent terminals. When the temperature value exceeds the set threshold, send an alarm message to the relevant person in charge.

Metal protective layer induced voltage monitoring system

The direct grounding box and the cross interconnection box are equipped with electromagnetic voltage transformers for phases A, B, C, and N, which monitor the induced voltage signals on the three-phase metal sheath in real time and transmit them to the management platform through intelligent terminals. When the induced voltage value exceeds the set threshold, send an alarm message to the relevant person in charge.

Metal protective layer temperature monitoring system

By placing the temperature sensor close to the metal sheath, the temperature on the three-phase metal sheath can be monitored in real-time and transmitted to the management platform through an intelligent terminal. When the temperature value exceeds the set threshold, send an alarm message to the relevant person in charge.

Gas state monitoring system (optional)
For the operating environment of cable tunnels, the intelligent terminal of cable protection layer can be equipped with gas sensors to monitor the gas environment of cable tunnels. The content of harmful gases such as oxygen, carbon monoxide, and combustible gases such as methane.

Real time monitoring of oxygen, harmful gases, and toxic gases through intelligent terminals, and real-time transmission to the management platform. When the gas content exceeds the set threshold range, the management platform automatically sends an alarm message to the relevant person in charge.

Other expandable state monitoring (optional)
Intelligent terminals also provide rich expansion interfaces, which facilitate the expansion of system functions

Access control sensor, water immersion sensor, human body sensing sensor

alarm record

The system predefines out of limit alarms and displacement alarms. When an alarm occurs, the relevant person in charge will receive a text message reminder, and the management platform will save relevant records for easy viewing, alarm recording, and alarm handling.

Other expandable state monitoring (optional)