Working function
1、Sheath induced voltage and ground loop current monitoring principle
Grounding box equipped with 0 ~ 500A single-mode current transformer and ground loop current acquisition module, real-time monitoring of 35kV and above high-voltage cable each high-voltage cable metal sheath grounding point (six-way ABC three).
Cable each high-voltage cable metal sheath grounding current, voltage parameters (six ABC three), can be realized on the 0-500A. 0-400V ground loop current,
0-400V grounding loop current measurement and regular inspection measurement, instead of the traditional manual way of regular grounding loop current inspection, greatly reducing the labor intensity of on-site measurement, improve system efficiency.
Field measurement of labor intensity, improve system maintenance efficiency.
2, cable partial discharge and localization of local discharge online monitoring principle
Cable partial discharge online monitoring system for 35kV and above voltage level cable partial discharge online and offline monitoring, real-time display of the joints and sections of the cable partial discharge.
It can show the amplitude and frequency of partial discharge of each connector and each section of cable, determine the relative position of the discharge point, and give an alarm if necessary. And can store
Test spectrum, discharge trend, so as to timely discover the insulation defects of cables and joints, and provide evidence for assessing the insulation level and aging degree, for the inspection and maintenance of cables.
Provide evidence for the maintenance work of the cable to provide a basis.
3, cable joint temperature measurement principle
In order to cooperate with the ring current detection, the temperature sensor is fixed in the grounded cable outer sleeve and sealed, and the temperature probe transmits the relevant grounded cable temperature information to the intelligent monitoring system.
Ground cable temperature information is transmitted to the intelligent monitoring unit temperature measurement module, you can also place the monitoring point on the surface of the cable joints to detect the cable joint temperature.
The monitoring point can also be placed on the surface of the cable joint to detect the temperature of the cable joint. It can realize 24-hour uninterrupted online monitoring of the surface temperature of high-voltage cable joints, and the temperature collection range is -55℃~+125℃.
+125℃. Through the statistical analysis of the temperature of the body layer of high-voltage cables, the operator can fully grasp its working condition and understand the condition of the cable sheath in time.
The condition of the cable sheath, and in the joint temperature rises sharply when the temperature limit is reached, an alarm signal to remind the relevant personnel.
