Discharge fault location system and method for gis AC withstand voltage test

Abstract

The invention discloses a system and a method for discharge fault location of a geographic information system (GIS) alternating current (AC) voltage withstand test, can effectively acquire the discharge fault signals of the GIS AC voltage withstand test, and can accurately locate a discharge air chamber. The system comprises a signal processing server, a plurality of ultrasonic sensors and a plurality of signal collectors. The signal processing server is used for analyzing partial discharge signals, abstracting discharge pulse signals, judging the position of a partial discharge source, and evaluating the serious degree of partial discharge. The plurality of ultrasonic sensors are dispersedly fixed on the outer surface of a GIS shell body, and used for acquiring the discharge fault signals inside the GIS through an ultrasonic detecting method. The plurality of signal collectors adopting single data bus cascade connections are respectively connected with the ultrasonic sensors, and the signal collectors at one end are connected with the signal processing server to be used for amplifying and collecting the signals from the ultrasonic sensors, storing fault signals, and transmitting data results to the signal processing server.

Description

technical field [0001] The invention relates to a GIS fault location system, in particular to a GIS AC withstand voltage test discharge fault location system and method. The invention belongs to the technical field of handover and preventive testing of electrical equipment. Background technique [0002] Gas-insulated metal-enclosed switchgear (GIS) has the characteristics of small footprint, little interference from the external environment, long maintenance cycle, and small operation and maintenance workload. Its installation and usage in power systems continue to increase. . However, there are many factors that cause internal insulation defects in GIS in the process of transportation and installation. It is a necessary test item to verify whether the performance is good and whether there are various hidden troubles. [0003] In field practice, GIS has internal defects and when discharge breakdown occurs in the AC withstand voltage test, the breakdown is completed instan...

AI Technical Summary

Problems solved by technology

This method uses the spectrum results to judge GIS faults based on the spectrum greater than a certain threshold. During the analysis process, the time domain characteristics of the original signal are lost, and the specific location analysis of the PD source cannot be done.

[0006] The existing signal acquisition system is: the data results of the single-point signal collector are separately transmitted to the signal processing server. In the case of multi-point signal acquisition, the system wiring is greatly increased, and the on-site installation is difficult.

Existing partial discharge detection systems and methods cannot meet the requirements of GIS AC withstand voltage discharge fault detection and location

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