High-voltage cable partial discharge on-line monitoring alarm method, device and system

Abstract

The present invention provides a high-voltage cable partial discharge on-line monitoring alarm method, device and system. The method comprises: obtaining monitoring data monitored by high-voltage cable partial discharge on-line monitoring when the sampling time is up; determining whether the deviation between the monitoring data and a preset alarm threshold is larger than a preset deviation value or not, and marking the monitoring data as alarm data if the deviation between the monitoring data and the preset alarm threshold is larger than the preset deviation value; calculating the ratio between the number of the alarm data and the number of the monitoring data in the statistics period when the statistics period is expired, wherein the ratio is taken as an over-limit probability; and determining whether the over-limit probability is larger than a preset probability threshold or not, and generating alarm information if the over-limit probability is larger than the preset probability threshold. The high-voltage cable partial discharge on-line monitoring alarm method, device and system are able to perform alarm according to the partial discharge measurement result so as to reduce the failure rate of a high-voltage cable line.

Description

technical field [0001] The invention relates to data monitoring technology, in particular to an alarm method, device and system for on-line monitoring of high-voltage cable partial discharge. Background technique [0002] In the power system, high-voltage cables, as an important part, are related to the safety and reliability of the entire power system. During the operation of the power system, various indicators of high-voltage cables need to be monitored. Partial discharge monitoring is a commonly used monitoring method, including intermittent monitoring and online monitoring. However, because partial discharge monitoring is easily affected by external influences, such as external electromagnetic signal interference, internal structure of cables or crosstalk inside cables, all of these will bring greater randomness to partial discharge monitoring. Moreover, with seasonal changes, weather changes, temperature changes, and load changes, the measurement results of partial di...

AI Technical Summary

Problems solved by technology

However, because partial discharge monitoring is easily affected by external influences, such as external electromagnetic signal interference, internal structure of cables or crosstalk inside cables will bring greater randomness to partial discharge monitoring

And, with seasonal changes, weather changes, temperature changes, and load changes, the measurement results of partial discharge will vary greatly

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