Measuring method for leakage current of zinc oxide arrester

Abstract

The invention discloses a measuring method for a leakage current of a zinc oxide arrester. The measuring method comprises the steps of: connecting a high-voltage output end of a DC high voltage generator with a ''-'' wiring end of a first DC ammeter, connecting a ''+'' wiring end of the first DC ammeter to a joint of an upper segment lightning arrester and a lower segment lightning arrester, connecting a voltage testing end of the DC high voltage generator with a DC microammeter, and grounding the tail end of the DC high voltage generator; connecting a voltage-dividing resistor with a resistance value ranging from 25 kilo-ohm to 35 kilo-ohm with a discharge counter in parallel and then connecting the voltage-dividing resistor with the lower end of the lower segment lightning arrester, and grounding the tail end of the voltage-dividing resistor; disconnecting the lower segment lightning arrester from the discharge counter, initiating the DC high voltage generator, and taking the reading of the DC microammeter as 1mA voltage of the upper segment lightning arrester when the reading of the first DC ammeter reaches 1mA. The measuring method avoids the potential safety hazards of high-altitude disconnection and connection of high-voltage lead wire operation, and improves the working efficiency and measurement precision.

Description

Technical field [0001] The invention relates to a current measurement method, in particular to a zinc oxide lightning arrester leakage current measurement method. Background technique [0002] Due to the large number of installations and scattered locations, the annual preventive test of the arrester is generally to remove the lead of the arrester, and then install and use the arrester after passing the test. The health of the arrester is tested through the test, which is time-consuming and labor-intensive, and many Under the circumstances, there are great safety hazards when high-altitude disassembly and connection of high-voltage leads are carried out on transmission lines with high voltage levels. The conventional test method is to remove the high-voltage lead of the arrester to check the contamination of the outer surface of the zinc oxide arrester (MOA) and clean it in time, check the primary lead of the zinc oxide arrester and the ground down conductor, check the safety dis...

AI Technical Summary

Problems solved by technology

The disadvantages of the two-terminal grounding method are: first, the data accuracy is poor, and the parallel voltage value of the two resistances can only be read at the same time. When the two resistances break down out of sync, the current will rise sharply and the measurement cannot be carried out; Invisible equipment damage risk, economical in general; third, poor promotion, can only be used in 220kV arrester test, can not be used in 500kV arrester test

The disadvantages of the upper and lower shielding method are: when the resistance of the lower section breaks down before the upper section, it will cause the current to rise sharply and make the measurement impossible

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