A device and method for locating partial discharge sources of electrical equipment

Abstract

The invention relates to a localization device and a localization method for electrical equipment partial discharge source. The device comprises six cylindrical sound pressure sensing primitives (1). The end part of each cylindrical sound pressure sensing primitive is provided with a fiber small hole (2). The end part of each cylindrical sound pressure sensing primitive is fixed with an elastic membrane (3). The internal of each cylindrical sound pressure sensing primitive is a coaxial hollow circular column, and each cylindrical sound pressure sensing primitive is internally provided with an elastic column (4) fixed on the bottom. Each elastic column is coiled with a fiber. The tail end of the fiber is plated with an aluminium membrane of high reflectivity. A laser emitted by a laser diode is input into an optical coupler via an optical isolator. Reflected interference light enters a photoelectric probe. The device adopts the differential structure, and thus isotropic noise in electrical equipment is offset in principle, thereby improving the signal to noise ratio. The invention adopts a method of locating the partial discharge source with the direction finding line minimum inscribed circle center principle. The invention can respond to supersonic signals of low energy, and has advantages of high sensitivity, large dynamic scope, anti-electromagnetic interference and high reliability.

Description

technical field [0001] The invention relates to a positioning device and a positioning method for partial discharge sources of electrical equipment, belonging to the technical field of electrical equipment detection. Background technique [0002] Oil is used as the insulating medium in many electrical equipment, which has the advantage of improving the insulation strength of the electrical equipment, cooling the electrical equipment through which a large current flows, and extinguishing the arc when an arc is generated inside the equipment. However, during the long-term operation of electrical equipment, due to problems such as insulation aging, overvoltage, or uneven structure of the insulation layer of electrical equipment, it is easy to cause local insulation performance to decline, and various types of discharges will occur first in these parts with weakened insulation, resulting in Further damage to the insulation causes various short-circuit faults to occur inside the ...

AI Technical Summary

Problems solved by technology

This method can obtain ideal results to a certain extent, but due to the large isotropic noise in the field and the low signal-to-noise ratio, the problem of positioning failure often occurs

[0005] In recent years, some scholars have proposed the idea of ​​using vector sensors to locate partial discharge sources inside electrical equipment. The output of vector sensors already contains the direction information of space targets. Vector sensors are divided into two types: co-vibration type and differential pressure type. Some vector sensors used for partial discharge detection of electrical equipment are based on the piezoelectric effect of piezoelectric ceramics to measure ultrasonic signals. The main disadvantages of piezoelectric ceramic sensors are low sensitivity and electromagnetic interference problems, etc.

This makes the potential advantages of the vector sensor can not be fully utilized

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