Residual voltage monitoring based state monitoring system and method for lightning arrester without serial gap

Abstract

The invention relates to a residual voltage monitoring based state monitoring system and method for a lightning arrester without a serial gap. The system comprises the lightning arrester, a ceramic capacitor insulator and a residual voltage monitor, one side of the lightning arrester is electrically connected with a high tension transmission line, the other side of the lightning arrester is electrically connected with a ground wire, the ceramic capacitor insulator comprises a high voltage arm and a low voltage arm connected to the high tension transmission line successively in parallel, the residual voltage monitor comprises a power taking module, a voltage signal processing module, a processor and a transmission module, the power taking module is electrically connected with the voltage signal processing module, the processor and the transmission module, the processor is electrically connected with the voltage signal processing module and the transmission module, the power taking module is connected to the two ends of the low voltage arm of the ceramic capacitor insulator, and the processor is in communication connection with a background lightning arrester state monitoring center via the transmission module. The system provided by the invention records the over-residual-voltage waveform of the lightning arrester completely and accurately, and monitors the online lightning arrester in real time.

Description

technical field [0001] The invention relates to the technical field of lightning arrester monitoring in power systems, in particular to a state monitoring system and method for lightning arresters without series gaps based on residual voltage monitoring. Background technique [0002] The surge arrester is one of the important equipment of the power system. At present, the zinc oxide arrester without gap is commonly used, which is mainly used to limit the internal overvoltage caused by the lightning overvoltage or operation caused by the line. [0003] In related technologies, on-line monitoring of zinc oxide arrester status mainly includes leakage current method, compensation method, zero-sequence current method, etc. Among them, the main measures of leakage current method are: measuring the full current change of zinc oxide arrester in the operating state, Measure the change of the resistive current flowing through the zinc oxide arrester to monitor the change of the perfor...

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Problems solved by technology

[0004] However, the steady-state resistive current monitored by the above method is good for judging the dampness of the arrester, but it is poor for the judgment of valve and bushing defects; Explain whether there is a defect in the arrester; and for the line arrester, this method faces the problem of difficulty in obtaining electricity

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