Processing method of running state signal of arrester

Abstract

The present invention provides a processing method of a running state signal of an arrester, relates to the power system signal processing technology, and especially relates to the signal processing technology based on the running state on-line monitoring of a transformer substation arrester. On the basis of signal processing algorithms of filtering, Fast Fourier Transform, Hilbert-Huang Transform and hanning window correction, the processing method provided by the invention comprises numerical filter, Fourier Transform, hanning window correction and Hilbert-Huang Transform. Through analysis of on-line monitoring data of arrester running state, the validity and the visualizability of the arrest running state data analysis result are improved, and a good analysis means is provided for corrective maintenance and on-line monitoring of the arrester.

Description

technical field [0001] The invention relates to a signal processing method for the operation state of a lightning arrester, which relates to the signal processing technology of a power system, in particular to the signal processing technology based on the online monitoring of the operation state of the lightning arrester in a substation. Background technique [0002] Whether the arrester in the substation works normally or not seriously threatens the safe and stable operation of the substation, thus affecting the safety level of the entire system. With the continuous development of smart grids, online monitoring of substation operating devices has become an important construction content of smart substations. In this process, it becomes a necessary means to carry out signal processing on the monitoring information of the operating state of the arrester and obtain accurate results. [0003] So far, the judgment of the operation status of the substation lightning arrester mai...

AI Technical Summary

Problems solved by technology

The existing resistive fundamental wave current method mainly separates the fundamental wave value of the resistive current from the total leakage current through harmonic analysis technology, which gives a rough judgment conclusion based on the change of the current from the perspective of the time domain, and fails to consider Due to the fence effect and spectrum leakage caused by the asynchronous signal acquisition and the error caused by the non-stationarity of the signal, it is impossible to accurately locate the time when the abnormal or fault state occurs, and it is difficult to draw accurate conclusions

In addition, since the resistive current accounts for a small proportion of the total leakage current under normal operating voltage, the change of the total leakage current is also small when the insulation performance of the arrester is degraded, and it is inevitable that misjudgment will occur only by harmonic analysis technology.

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