A test method for surge arresters in substations in the grid

Abstract

The invention provides a testing method for a lightning arrester of a transformer station in a power grid, wherein the testing method comprises a testing step of testing leakage current of the lightning arrester and a step of testing service life of the lightning arrester. Through testing the leakage current of the lightning arrester, whether the leakage current of the lightning arrester is in a normal range can be determined in time, thereby facilitating lightning arrester maintenance in time, and improving safety performance of the lightning arrester in the use process. Furthermore, through arranging a sensor on the lightning arrester, vibration data of the lightning arrester can be acquired in real time. Through utilizing a function relationship between the lightning arrester service life, the vibration frequency, the vibration strength and the number of vibrations, wherein the function relationship is acquired through mechanical vibration simulating tests, the service life state of the lightning arrester is monitored in real time, thereby replacing the lightning arrester in time and settling a safety problem caused by incapability of replacing damaged lightning arrester in long-term use.

Description

technical field [0001] The invention relates to the technical field of lightning arresters, in particular to a test method for lightning arresters in substations in a network. Background technique [0002] Surge arrester is one of the main protective devices to ensure the safe operation of power station equipment. Under normal system operating voltage, it presents a high resistance state, and only microampere current passes through it. Under the action of overvoltage and large current, its resistance drops sharply, and the leakage prevention Overvoltage energy, thereby limiting the voltage amplitude, to protect communication cables or equipment. [0003] The arrester itself in use will be affected by its own gravity, and at the same time it will bear the recombination generated by wind pressure. Due to the wind and other external forces, the wind vibration response will cause the arrester itself to be subjected to mechanical vibration loads. Damaged due to excessive vibrati...

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Problems solved by technology

[0003] The arrester itself in use will be affected by its own gravity, and at the same time it will bear the recombination generated by wind pressure. Due to the wind and other external forces, the wind vibration response will cause the arrester itself to be subjected to mechanical vibration loads. Damage due to excessive vibration load

[0004] In addition, in order to ensure the normal use of the arrester, it is necessary to regularly detect the current leakage of the arrester. The traditional test plan for the current leakage of the arrester requires bucket trucks, elevators and many operators. The labor intensity of the workers is high, and there are potential safety hazards.

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