Method for detecting hidden discharge current based on voltage extreme value

Abstract

The invention discloses a method for detecting hidden discharge current based on a voltage extreme value, comprising the steps of in real time monitoring information according to voltage waveform in an electric transmission line; determining amplitudes, phases, wave peak and wave valley time of the voltage waveform in the electric transmission line; acquiring lengths, waveform and triggering time of traveling wave signals by a traveling wave online monitoring device; selecting proper voltage extreme value neighborhoods; comparing the triggering time of each traveling signal in the electric transmission line with the extreme value time thereof according to the condition that the traveling wave triggering time becomes into hidden waveform; determining whether hidden discharge current presents at each extreme value position and in the entire voltage waveform section or not; if not, taking detected waveform current signals as clutter signals, and totally removing the interference waveform of non-hidden discharge current. By the method, the identifying efficiency of hidden discharge current can be greatly increased, hidden troubles of a power grid are reduced in removal and maintenance and the power grid is ensured to safely and steadily operate.

Description

technical field [0001] The invention relates to the technical field of hidden danger identification and safe operation of transmission lines, in particular to a detection method for hidden danger discharge current based on voltage extreme value. Background technique [0002] The transmission line is an important part of the power grid. If the potential safety hazards in the transmission line cannot be dealt with in a timely and effective manner, it will be impossible to ensure the safe operation of the line. Normal production and residential electricity consumption. [0003] The transmission line online monitoring system is a relatively complete and reliable modern information management platform for transmission lines. The transmission line on-line monitoring system is equipped with corresponding traveling wave current detection devices on both sides of the transmission line, detects the traveling wave current signal propagating at both ends of the line, and records the le...

AI Technical Summary

Problems solved by technology

[0004] Due to the diversity and complexity of the transmission line operating environment, there are a large number of clutter, corona, hidden discharges (floating discharges, tree discharges, floating objects, dirty discharges), line resonance and other types of clutter in the transmission line. It is difficult to identify, and it is easy to miss the hidden traveling waves that endanger the transmission line, resulting in failure to investigate in time, eventually causing failures or even major safety accidents

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