Zinc oxide lightning arrester operation state detection method

Abstract

The invention discloses a zinc oxide lightning arrester operation state detection method. The method adopts a voltage detection device and a current detection device to synchronously detect the three-phase voltage signal and the leakage current signal of the zinc oxide lightning arrester respectively; and the current detection device obtains the resistive component of the leakage current according to the three-phase voltage signal and the leakage current signal, and the operation state of the zinc oxide lightning arrester can be determined according to the resistive component. The inventive detection method reduces detection process complexity, improves detection safety, directly employs wireless synchronization in the detection system, and is suitable for outdoor and urban transformer stations.

Description

technical field [0001] The invention relates to an electrical signal detection method, in particular to a detection method for the operating state of a lightning arrester. Background technique [0002] There are a large number of zinc oxide arresters in the power system, and their stable operation is crucial to the power system. Once the zinc oxide arrester fails, the arrester itself will cause damage or even explode. At the same time, other electrical equipment will lose overvoltage protection and affect the power supply. safe operation of the system. In order to ensure the safe operation of zinc oxide arresters and reduce economic losses caused by power outages and accidents, it is necessary to regularly check the working conditions of zinc oxide arresters. [0003] For the state detection of arresters, the method of measuring the full current of the leakage current was mainly used before, but in the field operation, the full current of the leakage current generally canno...

AI Technical Summary

Problems solved by technology

[0004] The current measurement of the resistive current of the arrester is usually to introduce the collected voltage and current signals of the arrester to a measuring device through the signal cable, and the voltage signal generally needs to be introduced from the secondary side of the transformer. In this way, each test requires Changing the wiring of the transformer, the workload of the on-site wiring is heavy, and it also brings certain safety hazards to the operation of the substation.

[0005] In addition, the document "Portable MOA Detection System Based on Wireless Communication and GPS Timing" (Wang Youjia, Duan Dapeng, Jiang Xiuchen, etc., Electric Porcelain Arrester, 2009, (5): 41-45) proposed a wireless measurement method based on GPS synchronization, This method does not need to frequently change the wiring of the transformer in the field test, and the accuracy is high, but it needs to add a GPS synchronization module, and it is difficult to search for satellites on site, so it is only suitable for outdoor substations

Images