Zinc oxide arrester DC characteristic testing device and method

Abstract

The invention relates to a zinc oxide arrester DC characteristic testing device and a zinc oxide arrester DC characteristic testing method. The zinc oxide arrester DC characteristic testing device comprises a microprocessor control module, a power supply module and an A/D converter, and further comprises a high-voltage power supply, a voltage sampling module, a current sampling module and a D/A converter, wherein the high-voltage power supply of the device integrates a constant-voltage and constant-current control circuit, a voltage-doubling rectifying circuit and a protective circuit; and the D/A converter controls output signals of the high-voltage power supply and controls the high-voltage power supply to output constant-current and constant-voltage signals. The method for testing the DC characteristics of a zinc oxide arrester by adopting the device comprises that: the high-voltage power supply outputs 1mA current signals in a constant-current way; a voltage collection circuit collects a voltage value of the tested zinc oxide arrester; the microprocessor control module calculates a value which is 0.75 time the voltage value; the high-voltage power supply outputs the voltage with the voltage value which is 0.75 time the collected voltage value in a constant-voltage way; the current signals are collected; and the electric property of the zinc oxide arrester is judged. All test items are automatically finished, which realizes the disassembly-free test and uninterrupted operation of the arrester and reduces the complexity of the test work.

Description

technical field [0001] The invention relates to a device and method for testing the electrical performance of a surge arrester, in particular to a device and method for testing the DC characteristics of a zinc oxide arrester, belonging to the technical field of power supply facility testing. Background technique [0002] Zinc oxide surge arresters are used to protect various electrical equipment in the power system from being damaged by lightning overvoltage, operating overvoltage, and power frequency transient overvoltage. Its performance determines the normal power supply of the distribution network. work or not. [0003] my country's distribution network is widely distributed, and the number of zinc oxide arresters used is large, and the workload of testing the electrical performance of zinc oxide arresters is heavy. For the test of zinc oxide arrester in the industry, the control box is usually used to control the pressure doubler cylinder to form a high voltage generat...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a zinc oxide arrester that does not need to be disassembled, does not need to be disassembled, does not need to be powered off, and can be used on-site for high-voltage lines in view of the fact that the electrical performance test of the zinc oxide arrester requires a large impact caused by a power outage, the test work is inconvenient, and the accuracy of the test results is low. Device and method for testing DC characteristics of zinc oxide surge arrester with mopping floor and high test accuracy

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