Cable oscillation wave partial discharge detection fault judgment standard building method

Abstract

The invention relates to a cable oscillation wave partial discharge detection fault judgment standard building method which is applicable to the 10kV cable oscillation wave partial discharge detection fault judgment standard. The method comprises the following steps: 10kV cables of different operating life are tested to form test sample groups of different operating life; the partial discharge test result is in normal distribution when the sample size of a sample group is large enough, and a judgment threshold of standard is taken from a certain range in the negative direction of normal distribution; corresponding judgment thresholds for the sample groups of different operating life are formed; and then, cable intermediate joint faults in different positions are tested to form test sample groups, and statistics of fault locating results of the sample groups and the actual joint position deviation is made to obtain a deviation value which is used as a judgment standard value. The invention aims to solve the problems such as false judgment and missing judgment caused by the threshold-based equipment partial discharge judgment standard building method, and aims at 10kV cable oscillation wave partial discharge detection.

Description

Technical field: [0001] The invention relates to a method for establishing a fault judgment standard for partial discharge detection, and more particularly to a method for establishing a fault judgment standard for 10 kilovolt cable oscillation wave partial discharge detection. Background technique: [0002] In power systems, traditional power equipment partial discharge fault judgment standards are generally established using the threshold method based on experience. When the partial discharge level of power equipment (apparent discharge volume, discharge amplitude, etc.) Information such as the service life and discharge location of the power equipment was not considered. [0003] In fact, the insulation level of power equipment gradually decreases with the increase of operating years, which is a normal deterioration process, and this deterioration will not affect the safety of power equipment during its life cycle. This gradual deterioration is more prominent for 10kV po...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for establishing fault judgment standards for cable oscillatory wave partial discharge detection, which solves the problems of misjudgment and missed judgment caused by the traditional method of establishing equipment partial discharge judgment standards based on threshold values

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