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Method and device for measuring resistive currents of metal oxide arresters

A technology of resistive current and measurement method, applied in the direction of measuring device, measuring electrical variable, measuring current/voltage, etc., can solve the problems of unable to filter resistive current, unable to ensure accurate measurement of arrester resistive current, etc., to ensure safety running effect

Inactive Publication Date: 2017-01-25
XUJI GRP +4
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Problems solved by technology

[0005] The invention provides a method and device for measuring the resistive current of a metal oxide arrester to solve the problem that the resistive current measuring method in the prior art cannot filter out the influence of interphase interference and space interference on the resistive current, thereby failing to ensure the resistance of the arrester. Problems with Accurate Measurement of Sexual Current

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  • Method and device for measuring resistive currents of metal oxide arresters

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] Embodiment of the method for measuring the resistive current of the metal oxide arrester of the present invention

[0030] Such as figure 1 Shown, measuring method of the present invention comprises the steps:

[0031] 1) Collect the three-phase current signal and its corresponding voltage signal when the metal oxide arrester is running stably;

[0032] 2) process the three-phase current signal and the voltage signal in step 1), and calculate the phase angle of the three-phase current-voltage signal and the effective value of the three-phase current signal;

[0033] 3) According to the phase angle of the three-phase current and voltage signals in step 2), calculate the average value of the phase angles of the three-phase current and voltage signals, and use the average value of the phase angles of the three-phase current an...

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Abstract

The invention relates to a method and device for measuring the resistive current of a metal oxide arrester. The method includes: 1) collecting the three-phase current signal and the corresponding voltage signal when the arrester operates stably; 3) Calculate the average value of the phase angle of the three-phase current and voltage signals, and use it as the initial value of the phase angle of the three-phase current and voltage signals; 4) Correct the initial value of the phase angle of the three-phase current and voltage signals to obtain the three-phase 5) According to the phase angle correction value of the three-phase current and voltage signals, the three-phase resistive current of the metal oxide arrester is calculated. The device of the invention includes a current and voltage acquisition module, a current and voltage signal processing module, a phase angle correction module and a three-phase resistive current calculation module. The invention effectively filters the influence of phase-to-phase and space interference on the resistive current, thereby truly reflecting the operation state of the MOA and ensuring the safe operation of the power system.

Description

technical field [0001] The invention relates to the field of on-line monitoring of substations, in particular to a method and device for measuring the resistive current of a metal oxide arrester (MOA). Background technique [0002] Because of its superior protection performance, metal oxide arrester (MOA) is widely used in power system and becomes an important overvoltage protection device. Its operation reliability will directly affect the safety of power system. Due to the long-term exposure to power frequency voltage, impulse voltage and internal moisture, the MOA tends to age, which destroys its insulation properties, which manifests as an increase in resistive current, causing thermal collapse, and causing the arrester to explode. Therefore, long-term on-line monitoring of the resistive current of the zinc oxide arrester is an important means to ensure its safe operation. [0003] For zinc oxide arresters, phase-to-phase interference means that the arresters of each ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 曾国辉周水斌路光辉梁武民王伟杰雍明超牧继清郑浩赵大青兰五胜卢声毛丽娜郭旭杨芳王志成
Owner XUJI GRP
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