The Exploration And Application Of Medium And Low-voltage Circuit Breaker Cabinet On-line Detection

Partial discharge in insulation is one of the most important factors that affect safeoperation of the low-voltage circuit breaker cabinet. The insulating internal partial dischargemeans there is a localized defect, and this process will inevitably continue to develop duringthe entire run,, and it will result in insulation breakdown and damage when reaching a certainlevel. The test of the partial discharge characteristics of the electrical equipment are aneffective method of prevention in low-voltage circuit breaker failure. The traditional testtechniques rely on the check of insulating properties, on one hand, the cumulative damageeffect of the solid insulation equipment, on the other, the equipment must be power outages,resulting in the customer service reliability decline.This paper analyzes the current domestic10kV feeder circuit breaker cabinet partial discharge, to make a brief summary of its maindetection technology and do a research of its live detection theory, the detection technologyselected TEV assays mainly theoretical analysis, ultrasonic detection explore the direction ofthe law, supplemented by a combination of science and technology projects, the appropriatechoice of equipment (multi-function partial discharge detector (UltraTEV Plus+), etc.),develop rigorous experimental strategy, in Zhanjiang Power Supply substation10kVswitchgear Council put live testing, access to a wealth of experimental data. In the partialdischarge detection, selects the location of the fault, respectively, located in the rear upper ofthe switch cabinet, the middle of the switch cabinet and the under of the switch cabinetsubstation having a representation of the fault condition, elaborated data analysis process, tofind the equipment failure interval. Partial discharge fault, the subsequent blackoutexamination also confirmed the correctness of the test results, and to verify the effectivenessof the testing means through the site of the project implementation, effective and timelydetection by detecting and eliminating many potential hidden faults to ensure the safeoperation of the equipment, reduce supply lines planned outage time, it has importantpractical significance to improve the reliability of the power supply. Finally, we take anoutlook on how to further develop the potential of this new technology base on the summaryof the experience.