Operating method of resistive current on-line monitoring system of metal oxide arrester (MOA)

A resistive current and monitoring system technology, applied in the direction of measuring current/voltage, measuring electricity, measuring devices, etc., can solve the problems of difficult to achieve synchronous sampling, unreliable, short-range leakage in harmonic analysis, and achieve long-range suppression. The effect of leakage

Active Publication Date: 2012-05-02
路亚科消防车辆制造有限公司
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Problems solved by technology

[0006] In engineering applications, harmonic analysis always carries out limited point sampling and it is difficult to achieve strict synchronous sampling
In this way, when quasi-synchronous DFT is used for harmonic analysis, there will be long-range leakage due to the truncation effect and short-range leakage due to the fence effect, making the analysis results inaccurate and even unreliable

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  • Operating method of resistive current on-line monitoring system of metal oxide arrester (MOA)
  • Operating method of resistive current on-line monitoring system of metal oxide arrester (MOA)
  • Operating method of resistive current on-line monitoring system of metal oxide arrester (MOA)

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Embodiment Construction

[0043] An MOA resistive current online monitoring system of the present invention includes: an MOA resistive current online test unit, and a monitoring server for data communication with the MOA resistive current online test unit through a wired or wireless network.

[0044] The working method of the MOA resistive current online monitoring system comprises the following steps:

[0045] (1), the CPU of the MOA resistive current online test unit simultaneously samples the grid voltage V and the leakage current I of the MOA, and respectively samples the grid voltage V and the leakage current I at equal intervals W+2 sampling points to obtain the measured Analyze the discrete sequence {f(k),k=0,1,...,w+1} of the signal. W is determined by the integration method, the number of iterations n and the number of sampling points N in the ideal period. Equal interval sampling refers to determining the sampling frequency f according to the frequency f of the ideal signal for harmonic anal...

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Abstract

The invention discloses an operating method of a resistive current on-line monitoring system of a metal oxide arrester (MOA). Fundamental wave parameters of a resistive leakage current of the MOA are usually obtained according to a projection method. The method comprises the following steps of: sampling an electric network voltage and an MOA leakage current signal at the same time; acquiring a fundamental wave amplitude value and an initial phase angle of the electric network voltage by using a quasi-synchronization discrete Fourier transformation (DFT) harmonic analysis technology of a variable fence; acquiring the fundamental wave amplitude value and the initial phase angle of the MOA leakage current by using the quasi-synchronization DFT harmonic analysis technology of the variable fence; acquiring a projection angle of a fundamental wave of the leakage current on the fundamental wave of the electric network voltage according to the projection method; and acquiring the fundamental wave of the resistive leakage current of the MOA, and outputting and displaying the fundamental wave. By adoption of the operating method of the resistive current on-line monitoring system of the MOA, the analysis error of the quasi-synchronization DFT harmonic analysis technology is effectively avoided, and a high-accuracy harmonic analysis result is obtained, so that the reliability in test of the resistive current of the MOA based on a harmonic analysis theory is improved.

Description

technical field [0001] The invention relates to the technical field of MOA resistive current testing, in particular to a working method of an MOA resistive current online monitoring system based on a high-precision harmonic analysis method. Background technique [0002] Metal oxide surge arresters (hereinafter referred to as MOA) are widely used in power systems due to their superior overvoltage protection characteristics, but the aging of MOA resistors and thermal and impact damage will cause failures, which may lead to explosions and arrester breakdown It will also lead to a short circuit of the substation bus and affect the safe operation of the system. Therefore, strict and effective detection and regular preventive tests must be carried out on the running MOA. In the detection and test of zinc oxide arresters, the measurement of leakage current under AC operating voltage is an important item. The size of the resistive current fundamental wave component in the leakage cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/02
Inventor 傅中君陈丹
Owner 路亚科消防车辆制造有限公司
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