Method and device for checking zinc oxide lightning arrester block property current tester

A resistive current and calibrating device technology, applied in the direction of measuring devices, instruments, measuring electrical variables, etc., can solve problems such as difficulty in ensuring stability and difficulty in simulating third harmonic resistive current, so as to facilitate processing and storage, The effect of high measurement accuracy
CN101299062AActive Publication Date: 2008-11-05WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID
Publication Date
2008-11-05

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Abstract

A method for checking a resistive current tester of a zinc oxide lightning arrester is characterized in that a reference voltage signal v and a total current signal i are synthesized with a software technique according to a mathematical mode of the resistivity of zinc oxide lightning arrester established in the national standard DL / T987-2005 u=U Sin omega t (1); i=IR1Sin omega t+IR3Sin(3omega t+pi)+IC1Sin(omega t+pi / 2) (2). One set of high precision D / A converter is controlled by a computer. The digital signal of reference voltage and total current signal which are synchronized by software is converted to analogue signal. The analogue signal is modulated and amplified by a program controlled accurate power amplifying unit and is taken as a standard signal which checks the resistive current tester of the zinc oxide lightning arrester. The method adopts a computer intelligent control technique and has advantages of digital designing principle, high measuring accuracy, and convenient processing and storing of the measured data. The device can conveniently set various checking parameters such as reference voltage, total current, resistive current, capacitive current and the like, and can set the resistive current of third harmonic.
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Description

technical field

[0001] The invention belongs to the technical field of power equipment testing, and in particular relates to a calibration method and device for a zinc oxide arrester resistive current tester, which are suitable for verifying the measurement accuracy of the zinc oxide arrester resistive current tester. Background technique

[0002] Zinc oxide arrester is an important equipment to ensure the safe operation of the power system. The zinc oxide arrester resistive current tester can evaluate the insulation status of the zinc oxide arrester by measuring the leakage current flowing through the zinc oxide arrester insulation, which is very important for the safe operation of the system. Significance.

[0003] At present, the calibration of the zinc oxide arrester resistive current tester mainly adopts the parallel connection method of resistance and capacitance elements, that is, the hardware method is used to simulate the operation status of the zinc oxide arrester....

Claims

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