Power transmission and distribution line partial discharge fault on-line detection method and apparatus thereof

Abstract

The invention provides a power transmission and distribution line partial discharge fault on-line detection method and an apparatus thereof, belonging to the measurement field. A method of on-line remote orientation focusing pick-up / positioning is employed to capture a supersonic wave signal generated in a discharge process, a heterodyne method is used to convert the picked supersonic wave signal into a sound / electrical signal which can be distinguished by detection personnel, according to a value size or change of sound pressure / voltage, whether a position where a partial discharge fault easily happens exists a contaminant flashover phenomenon or not and a degree of contaminant flashover are determined qualitatively and quantificationally, thereby, intensity of contaminant flashover of the position where the partial discharge fault easily happens and a size of threat to a system are determined, manpower and regular inspection cost can be greatly reduced, previous power failure time workload is reduced, safety operation of electric power equipment is ensured, maintenance cost is saved, and power supply reliability is raised. The method and the apparatus can be widely used in the on-line detection and fault diagnosis of a power transmission and distribution line.

Description

Technical field [0001] The invention belongs to the field of measurement, and in particular relates to a method and a device for detecting partial discharge of transmission and distribution lines. Background technique [0002] Transmission line is an indispensable electrical equipment in the power transmission process of the power system. Its reliable and safe operation is directly related to the reliability of the entire power grid. [0003] The surface of the transmission line will cause surface discharge due to air pollution, dust, and poor contact, which will eventually form a flashover, which will reduce its safety performance. Especially in heavily polluted areas, there are more filth in the air, resulting in The increase in the equivalent salt density, the aging of the insulation and the poor contact of the connecting metal will cause its discharge, which will eventually form a flashover, which will reduce the safety performance of the distribution network transmission line....

AI Technical Summary

Problems solved by technology

[0009] Since the acoustic monitoring method has a great relationship with the size of the acoustic signal, it must have high sensitivity to capture the weak acoustic signal generated when the discharge starts, and at the same time it cannot be disturbed by noise, causing false alarms

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