Metallic oxide lightning arrester leakage current live test device and method

Abstract

The invention discloses a metallic oxide lightning arrester leakage current live test device and method. The test device comprises a noninductive shielding resistance and a lightning arrester leakage current tester, the noninductive shielding resistance is connected to a grounding wire of the metallic oxide lightning arrester in series, and disturbance of the surrounding electromagnetic environment for a leakage current can be shielded by the noninductive shielding resistance; a voltage transformer is connected with the two ends of the metallic oxide lightning arrester in parallel, the leakage current input end of the lightning arrester leakage current tester is electrically connected with the noninductive shielding resistance, and the input end of a reference voltage is electrically connected with a secondary voltage terminal of the voltage transformer. An analysis is carried out by the lightning arrester leakage current tester according to phase changes of the waveforms of a collected reference voltage signal and a leakage current signal, and the aging degree of the metallic oxide lightning arrester can be determined. According to the metallic oxide lightning arrester leakage current live test device and method, the metallic oxide lightning arrester leakage current can be simply, precisely and effectively tested, and the aging degree of the metallic oxide lightning arrester can be analyzed.

Description

technical field [0001] The invention relates to the field of electrical measurement, in particular to a live test device and method for leakage current of a metal oxide arrester. Background technique [0002] Surge arrester is a device used to limit the lightning overvoltage transmitted from the line or the internal overvoltage caused by operation. This device is one of the important protection devices to ensure the safe operation of the power system. figure 1 It is a schematic diagram of the installation position of the lightning arrester in the transmission line. like figure 1 As shown, generally in the transmission line 01, the lightning arrester 7 is connected in series on the grounding wire at the front end of the electrical equipment 02. Further, the lightning arrester is also connected in series with a discharge counter 8, and in parallel with accessories such as a voltage transformer 6. [0003] Metal Oxide Surge Arresters (MOA) are the most widely used in transmis...

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Problems solved by technology

[0006] In the embodiment of the present invention, a metal oxide arrester leakage current live test device and method are provided to solve the problem of on-line detection of the metal oxide arrester leakage current in the operation transmission line in the prior art due to the relatively large electromagnetic interference on site. Strong, so that the error of the leakage current obtained by the detector is relatively large, which cannot reasonably and effectively reflect the aging degree of the metal oxide arrester

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