Test method for measuring direct-current leakage of zinc oxide lightning arresters without dismantling high-voltage leads

Abstract

The invention discloses a test method for measuring direct-current leakage of zinc oxide lightning arresters without dismantling high-voltage leads, and relates to the technical field of lightning arrester overhaul testing. A capacitance current between flanges and an equalizing ring is shielded through an insulating shielding case, and when the micro-amp representation number is 1 mA, the consoleoutput voltage is the direct-current 1-mA voltage, namely U<1mA> of the lightning arresters; and a 0.75 U<1mA> button on a console of a direct-current high-voltage generator is pressed down, and a reading of a micro-amp meter is 0.75 U<1mA> direct-current leakage. The test method has the beneficial effects that the high-voltage leads do not need to be dismantled, compared with present-stage conventional tests, the workload is small, the work risk is small, the repair time is shortened, and the working efficiency is improved; a shielding method is adopted, the connection flanges between the lightning arresters are shielded through insulation materials, the influences of a stray current are eliminated, and the accuracy of the test result is improved; and the materials needed by the method are simple and easy to obtain, a test instrument is a conventional instrument, the test method is easy to master, direct-current leakage of the zinc oxide lightning arresters can be accurately measured, and the states of the zinc oxide lightning arresters are convenient to master.

Description

technical field [0001] The invention relates to the technical field of lightning arrester DC leakage current testing, in particular to a test method for measuring the DC leakage of a zinc oxide lightning arrester without removing a high-voltage lead wire. Background technique [0002] At this stage, there are two types of test methods for the DC leakage current (hereinafter referred to as DC leakage) of zinc oxide arresters, which are divided into the conventional test method of removing the high-voltage lead wire and the test method of not removing the high-voltage lead wire; the test method of not removing the high-voltage lead wire has two tables at this stage method and equipotential method. [0003] The conventional DC leakage test needs to remove the high-voltage lead wire, and conduct the test section by section from top to bottom. The following is an example of a 750kV zinc oxide arrester test, as follows: Figure 5 As shown, first remove the high-voltage lead wire a...

AI Technical Summary

Problems solved by technology

[0006] The conventional test method has a large workload and takes a long time; repeated disassembly and assembly of the lead wires may easily cause hidden dangers such as lead wire damage and poor screw contact; the work is relatively dangerous; the double meter method is used for testing, and th

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