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
Active Publication Date: 2008-11-05
WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID
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[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. This method requires three ammeters to be connected to the circuit for detection. The biggest disadvantage is that it is difficult to simulate the third harmonic resistive current generated by the nonlinear characteristics of zinc oxide arresters, and the third harmonic resistive current is an important parameter reflecting the insulation of zinc oxide arresters. At the same time, the stability of this method is also very high. Difficult to guarantee
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[0035] see figure 1 . In the embodiment of the present invention, the process of using software technology to synthesize the reference voltage signal v and the full current signal i is as follows figure 1 shown.
[0036] The working principle of the verification device in the embodiment of the present invention is as follows: figure 2 According to the established mathematical model, the computer sends standard reference voltage and full current digital signals to the D / A unit, and converts them into analog signals through D / A and transmits them to the power amplifier unit. The power amplifier unit amplifies the voltage and current signals and provides them to the receiver. The detection device adopts a pure software control method, the setting of standard signals such as reference voltage, full current, resistive current, capacitive current, and third harmonic resistive current can be set through software, and the display can simultaneously display the output standard value...
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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.
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....
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IPC IPC(8): G01R35/00
Inventor 郭恒王建杨永辉谢妍
Owner WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID
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