Partial discharging positioning method based on time delay error stochastic simulation and statistic analysis

Abstract

The invention provides a partial discharging positioning method based on time delay error stochastic simulation and statistic analysis. The partial discharging positioning method comprises the following steps that firstly, four time delays needed by positioning are obtained according to the generalized cross-correlation algorithm based on a set of waveforms received by a quaternary ultra-high frequency antenna array; secondly, the time delay error range is set with the time delays as base points, n sets of time delays are simulated in the time delay error range in a random mode, random functions are distributed in a normal mode, and the time delays worked out in the first step are adopted in the center; thirdly, the two-dimensional positioning information of a discharging source is calculated according to the n sets of time delays, and a direction angle distribution diagram is obtained; fourthly, the angle with the maximum angle distribution probability is set to be the positioning angle according to the statistical analysis method; fifthly, a search area is spread with the positioning angle as the center, grid searching is carried out, and the positioning angle and the radial distance of the discharging source are calculated. The partial discharging positioning method based on time delay error stochastic simulation and statistic analysis can improve the accuracy of partial discharging positioning.

Description

technical field [0001] The invention relates to high voltage and insulation technology of electric power system, in particular to a partial discharge location method based on time delay error random simulation and statistical analysis. Background technique [0002] Insulation fault is one of the most important possible faults in the operation of power equipment. Before the insulation fault of power equipment occurs, there will generally be a gradual partial discharge process, which will eventually lead to insulation breakdown. If partial discharge monitoring and diagnosis of operating equipment can be carried out during this process, partial discharge signals can be detected in time, and defects can be dealt with in advance, so that the occurrence of insulation breakdown faults can be effectively avoided. The positioning of the partial discharge location is also helpful to formulate a more targeted maintenance treatment plan, reduce power outage time, and improve maintenance...

AI Technical Summary

Problems solved by technology

Since the partial discharge of the substation is carried out in three-dimensional space, the positioning error will further increase

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