Discrimination method for detecting turn-to-turn insulation faults of air-core reactor by pulse voltage process based on FFT transform domain characteristics
An air-core reactor and pulse voltage technology, applied in the direction of electric winding testing, etc., can solve the problems that the criterion is difficult to obtain accurately, is not intuitive enough, and the frequency domain amplitude spectrum method lacks the basis for frequency band selection, etc., to achieve accuracy and reliability, and the discrimination method is intuitive Effect
Inactive Publication Date: 2020-05-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0007] The present invention provides a pulse voltage method based on the characteristics of the FFT transform domain to detect inter-turn insulation faults of air-core reactors, which is used to solve the problem that the pulse voltage method is not intuitive enough and the criterion is difficult to be accurate when judging the inter-turn insulation faults of air-core reactors. Obtained, and the technical problem of the lack of basis for frequency band selection in the frequency domain magnitude spectrum method
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[0035] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.
[0036] The discriminative method for detecting inter-turn insulation faults of air-core reactors based on the pulse voltage method based on FFT transform domain characteristics of the present invention includes:
[0037] 1. Criteria for detecting inter-turn insulation faults of air-core reactors based on pulse voltage method based on FFT transform domain characteristics
[0038] (1) The principle circuit of the pulse voltage method is as follows: image 3 as shown, image 3 The typical values of the parameters in: resistance R w =50Ω, capacitor C=3nF, U is charged to 180kV. Using the air-core reactor in normal state, based on the pulse voltage method, a pulse oscillation circuit is added to the air-core reactor to obtain the time-domain oscilla...
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The invention discloses a discrimination method for detecting turn-to-turn insulation faults of an air-core reactor by pulse voltage process based on FFT transform domain characteristics. The method comprises: criterion and discrimination procedures for detecting the turn-to-turn insulation faults of the air-core reactor by pulse voltage process based on FFT transform domain characteristics. The criterion of the method comprises: based on pulse voltage process and FFT transformation, due to the fact that a frequency corresponding to the peak point of a spectrogram is attenuation resonant frequency, adding a frequency domain criterion to obtain spectrograms and attenuation resonant frequency of the air-core reactor in a normal state and a critical state. The discrimination procedure of themethod comprises: discriminating whether the reactor fails or not according to the position relation between the peak point of the spectrogram of the to-be-detected reactor and the peak points of thespectrograms in the normal state and the critical state. The discrimination method for detecting the turn-to-turn insulation faults of the air-core reactor by the pulse voltage process based on the FFT transform domain characteristics is intuitive, accurate and high in reliability.
Description
technical field [0001] The present invention relates to the field of fault diagnosis of electric power equipment, in particular to a discrimination method for detecting inter-turn insulation faults of air-core reactors by pulse voltage method based on FFT transform domain characteristics Background technique [0002] The actual operation of air-core reactors at home and abroad and a large amount of data show that the main cause of dry-type air-core reactor burnout is inter-turn short circuit fault. The pulse voltage method is a common method for detecting inter-turn insulation faults of air-core reactors. This method judges by comparing the time-domain waveforms of the voltage at both ends of the air-core reactor under the calibration voltage and the test voltage, and observing the change of the zero-crossing point and the speed of decay. Whether the inter-turn insulation is intact. However, the result obtained by this method is the time-domain waveform of the voltage chang...
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IPC IPC(8): G01R31/72
Inventor 杨鑫易俊华祝欢欢董盼姚铮
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY