Cable Sheath Circulation Monitoring System

HV cable grounding loop current monitoring device is mainly composed of two parts: front-end monitoring equipment and back-end monitoring center, which can realize accurate detection of HV cable grounding loop current. The system transmits the collected data to the local monitoring panel in real time through RS485 communication module. The monitoring terminal adopts advanced measurement circuits and stable and reliable sensors to ensure accurate measurement of monitoring signals and reliable transmission of data, providing a strong guarantee for the safe and stable operation of high-voltage cables.

Working Principle

The cable sheath ring current online monitoring device is mainly composed of two parts: front-end monitoring equipment and back-end monitoring center. Front-end current monitoring device will be in the high-voltage cable sheath grounding, accurate installation of high-precision current transformers with a range of 0 ~ 500A. The device can accurately and real-time monitor the current parameters of each metal sheath grounding point of 10kV and above high-voltage cables. Through RS485 communication, the current parameters of the sheath grounding and alarm information can be transmitted to the monitoring center in a timely manner, so that the staff can detect the damage of high-voltage cables in a timely manner, and then be able to quickly arrange for the replacement of the cable or repair work. This device can realize the accurate measurement of 0 ~ 500A grounding loop current as well as regular inspection measurement, completely replacing the traditional manual way of regular grounding loop current inspection, and effectively determining the situation of the grounding box being stolen or the grounding wire being stolen and cut. This not only greatly reduces the labor intensity of on-site measurement, but also significantly improves the system maintenance efficiency.

Main components of the device

Data Acquisition Host

current transformer

Data Acquisition Hostspecificities

• The device has a strong monitoring ability, can accurately and effectively monitor the ring current data of high-voltage grounding cable. Users can independently and flexibly set the warning value and alarm value according to the actual needs, and the system can real-time, stable uploading of high-voltage grounding cable loop current data.
• The device is equipped with a variety of data interfaces, can be directly connected to the built-in modules, sensors, to achieve the corresponding data collection work, but also has an over-limit ground loop current alarm function.
• The mainframe is equipped with a multi-channel current measurement interface, which can simultaneously measure multiple ground currents or body currents. The maximum number of measurement channels can be up to seven.
• The mainframe has excellent anti-electromagnetic interference and waterproof processing capabilities, and the use of industrial-grade components, can withstand high temperatures up to 85 ℃ and a minimum of -20 ℃ low temperature.
• Using aluminum die-casting shell, the shell has high strength, corrosion resistance, in harsh environments can still ensure that the equipment is stable and unaffected.

Technical Parameter

current transformer

High-voltage cable sheath ring current online monitoring device

Application Cases

System Description

System wiring diagram

The monitoring device accurately acquires grounding current data with the help of current sensors and uploads the collected data to the substation control center server in real time via RS485 communication. Immediately after that, the control center server further uploads the data to the centralized control center server using network communication.