Method for online detecting leakage resistive current of lightning arrestor

A technology of resistive current and linear current, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of inability to effectively monitor the internal performance degradation of arresters, and achieve the effect of convenient implementation, low cost and high precision

Inactive Publication Date: 2013-01-02
上海思盛信息科技事务所
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Problems solved by technology

Only by detecting the full current, it is impossible to effectiv...

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Embodiment Construction

[0035] The present invention, that is, a method for on-line detection of a leakage resistive current of an arrester, comprises the following steps:

[0036] In step 1, the three components of the leakage current of the arrester are superimposed and synthesized, which are the capacitive linear current component, the linear resistive current component and the nonlinear resistive current component that are 90 degrees ahead, namely:

[0037] IX=IC+IR+IF Formula ①

[0038] IC=(Um / ZC)×Cos(ωt) Formula②

[0039] IR=(Um / ZR)×Sin(ωt) Formula③

[0040] IF=Sgn[S in(ωt)]×F(Q) Formula④

[0041] Q=|Um Sin(ωt)|-K Formula ⑤

[0042] In formula ①, IX is the full leakage current of the arrester, IC is the capacitive linear current component, IR is the linear resistive current component, and IF is the nonlinear resistive current component;

[0043] In formula ②, IC is the capacitive linear current component, Um is the power frequency voltage applied to the arrester, ZC is the capacitive impeda...

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Abstract

Disclosed is a method for online detecting leakage resistive current of a lightning arrestor. The method includes that three components including a capacitive linear current component, a linear resistive current component and a non-linear resistive current component of leakage current of the lightning arrestor are subjected to superposition, namely IX=IC+IR+IF, before a reference point is found, the three leakage current components are separated into a linear part of IC+IR and a non-linear part of the IF, after a total leakage current waveform starting from a null point for a complete period is obtained, a maximum value is searched within the first 1/4 period to be the maximum value Im for the linear part, and position of the maximum value is tm; via computing, the non-linear resistive current component IF is obtained, the maximum value IF_Max is obtained to be the peak value of the non-linear resistive current component IF, and the peak value is taken as the reference point, the position of the peak value is tF, the value IX (tF-T/4) at the position tF-T/4 is found out on the total current waveform IX, and the value IX (tF-T/4) is the peak value of the capacitive current component IC, and then an included angle alpha between the total current and resistive current and the peak value of the linear resistive current component IR is obtained via computing. The method for online detecting leakage resistive current of the lightning arrestor has the advantages of low cost, high precision, convenience in operation and the like.

Description

technical field [0001] The invention relates to a method for on-line detection of leakage resistive current of an arrester. technical background [0002] Zinc oxide arrester is a kind of protective equipment to protect electrical equipment from overvoltage. Due to the superior nonlinear characteristics and good flow capacity of the zinc oxide arrester, it has been accepted and widely used by users in the power sector. Damage and electrical accidents also occur, especially zinc oxide surge arresters with a voltage level of 110KV and above, once an accident occurs, it will cause huge losses to users. [0003] When the arrester is in the normal operating voltage state, the resistive current component is much smaller than the capacitive component. Generally, the proportion of the resistive leakage current component to the total current will not exceed 10-15%. Therefore, even if the resistive component is doubled, the entire The current will not vary by more than 5.0%. Only by...

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Application Information

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IPC IPC(8): G01R31/02G01R19/06
Inventor 张瑜李玥蓉董慈航
Owner 上海思盛信息科技事务所
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