Remote online monitoring method of lightning arrester

Abstract

The invention discloses a remote online monitoring method of a lightning arrester, which comprises the following steps of: 1, through a current transformer, obtaining a leakage current signal and an operation voltage signal of the lightning arrester through a voltage transformer; 2, preprocessing the leakage current signal and the operation voltage signal; 3, transmitting the preprocessed signals to an upper host through a wireless transmission mode; and 4, analyzing and computing by the upper host, and analyzing and comparing with data in a database, and when the detected resistive current value of the lightning arrester exceeds the set threshold, sending an alarm signal.

Description

technical field [0001] The invention relates to a remote on-line monitoring method for a lightning arrester, which is particularly suitable for the remote monitoring of a metal zinc oxide lightning arrester in a 10kV-110kV power grid. Background technique [0002] The 10kV~110kV power grid is the most complex link in the power system. Therefore, lightning arresters must be installed for lightning protection for transformers and cable lines, so the probability of failure of the arrester in the 10kV~110kV power grid is relatively high. If the arrester in the 10kV~110kV power grid fails, it will cause the following hazards: (1) If the arrester is not completely broken down, as the leakage current of the arrester increases, the line loss will also increase, which violates the economy of the grid operation . (2) When the lightning arrester is broken down, it will cause a little grounding fault, but this kind of fault is difficult to see directly from the appearance, and the faul...

AI Technical Summary

Problems solved by technology

If the arrester in the 10kV~110kV power grid fails, it will cause the following hazards: (1) If the arrester is not completely broken down, as the leakage current of the arrester increases, the line loss will also increase, which violates the economy of the grid operation

(2) When the lightning arrester is broken down, it will cause a little grounding fault, but this kind of fault is difficult to see directly from the appearance, and the fault point is not easy to find; when two-phase lightning arresters have ground faults at the same time, it will cause switch protection The action caused a large-scale blackout

(3) When the arrester is severely damaged, it may even explode, further causing damage to other surrounding equipment and causing the fault to expand

However, due to the large number of arresters, each inspection will consume a lot of manpower, financial resources and power outages

At the same time, the possibility of damage to the arrester during the two preventive tests cannot be ruled out. For this reason, many operating departments have revised the test period to 3 to 5 years, and some even canceled the preventive test until the arrester is damp or aging. its replacement

In addition, since it is difficult to find the short-circuit grounding of the arrester from the appearance, it is very difficult to find the fault point, and it cannot be repaired in time, which is very unfavorable to the safety and reliability of the power grid.

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