Detection method of partial discharge of electrical equipment and device thereof

A technology for partial discharge detection and electrical equipment, applied in the direction of testing dielectric strength, spectrum analysis/Fourier analysis, etc., can solve the problems of difficult installation and maintenance of contact measurement methods, improve reliability and sensitivity, and overcome installation and maintenance Difficulty, the effect of improving utilization efficiency

Active Publication Date: 2012-06-20
GUANGXI POWER GRID ELECTRIC POWER RES INST +1
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Problems solved by technology

[0005] Another purpose of the present invention is to solve the technical problems existing in the prior art; to provide a non-contact ultra-high frequency detection method using an external antenna, which can overcome the shortcomings of the contact mea

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  • Detection method of partial discharge of electrical equipment and device thereof
  • Detection method of partial discharge of electrical equipment and device thereof
  • Detection method of partial discharge of electrical equipment and device thereof

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[0026] Examples:

[0027] A method for detecting partial discharge of electrical equipment includes the following steps:

[0028] Step 1. Establish a partial discharge test model for model test. Use a digital storage oscilloscope to measure the partial discharge current waveforms under different discharge forms through a shunt, and then use Matlab software to Fourier transform the current waveform to obtain the partial discharge of electrical equipment Typical spectrum characteristic curve of current; among them, the different discharge forms are: pin-board discharge, air gap discharge, oil wedge discharge, surface discharge, suspension discharge, internal oil gap discharge. The specific operation method to obtain the typical spectral characteristic curve is as follows:

[0029] Step 1.1, connect the shunt in series in the discharge circuit of the test model, and connect the output end of the shunt to the digital storage oscilloscope via a coaxial cable, measure the current waveform...

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Abstract

The invention relates to a detection method partial discharge of electrical equipment and a device thereof. The detection method comprises the following steps of: erecting a measuring antenna in the position which is 20-30m away from the equipment to be detected, measuring an electromagnetic wave electric field component radiated from the electrical equipment, transmitting the measured signal waveform of the electromagnetic wave electric field component into a digital storage oscilloscope for storage, transmitting the signal waveform from the digital storage oscilloscope to a computer via a communication cable, performing Fourier decomposition on the signal waveform by application software of the computer to get a frequency spectrum characteristic curve of radiated electromagnetic waves, and performing contrastive analysis on the frequency spectrum characteristic curve according to the corresponding relation between a 1GHz-3GHz ultra-high frequency component and the partial discharge characteristic of the electrical equipment so as to identify and evaluate the partial discharge characteristic of the detected electrical equipment. The detection method has the following advantages: 1-3GHz ultra-high frequency signals of the radiated electromagnetic waves generated by the partial discharge are measured through an ultra-high frequency detection method, so that the detection is less affected by external interference signals, and reliability and sensitivity in detection of the partial discharge can be greatly improved.

Description

technical field [0001] The invention relates to a partial discharge detection method and a device thereof, in particular to a partial discharge detection method and a device of electrical equipment. Background technique [0002] At present, the detection and evaluation of partial discharge characteristics of electrical equipment can be divided into two categories: non-electrical measurement method and electrical measurement method according to the nature of the detected physical quantity. [0003] The non-electrical method detects non-electrical phenomena such as ultrasonic waves, emitted light, heat, and new products that are generated during the partial discharge process to identify partial discharges of electrical equipment; the electrical measurement method detects electrical pulses and electromagnetic radiation generated during the partial discharge process. , Charge transfer and electrical energy loss and other electrical phenomena to identify partial discharge of elec...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R23/16
Inventor 黎大健张玉波韦巍赵坚夏长征
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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