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On-load tap-changer switching program online detection and diagnosis method

A technology of on-load tapping and switching, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., and can solve the problem that it can only be carried out offline

Active Publication Date: 2019-03-22
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

The OLTC needs to be disassembled during the DC detection method test, which can only be carried out offline

Method used

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  • On-load tap-changer switching program online detection and diagnosis method
  • On-load tap-changer switching program online detection and diagnosis method
  • On-load tap-changer switching program online detection and diagnosis method

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0028] The invention provides an on-line detection and diagnosis method for the on-load tap-changer switching program. The present invention judges online whether the on-load tap-changer switching program state is normal according to the characteristic peak of the OLTC online vibration data envelope curve. When the switching program is normal, The time interval of the characteristic peaks of the OLTC online vibration data envelope curve is basically the same. When the switching program is abnormal, the time interval of the characteristic peaks of the OLTC online vibration data envelope curve changes greatly. Therefore, the present invention is based on the characteristic peak of the...

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Abstract

The invention provides an on-load tap-changer switching program online detection and diagnosis method. The method comprises the following steps that original online vibration data is detected and acquired; an enveloping curve of the original online vibration data is calculated and is defined as an original fingerprint of on-load tap-changer vibration; an original fingerprint switching program feature vector X is calculated; to-be-diagnosed online vibration data is detected and acquired; an enveloping curve of the to-be-diagnosed online vibration data is calculated and is defined as a to-be-diagnosed fingerprint of on-load tap-changer vibration; a to-be-diagnosed fingerprint switching program feature vector X is calculated; correlation coefficients A are calculated; according to the correlation coefficients A and diagnosis criteria, it is judged whether an on-load tap-changer switching program is abnormal or not. By adopting the on-load tap-changer switching program online detection anddiagnosis method, the online detection purpose is achieved.

Description

technical field [0001] The invention relates to the technical field of electric appliance detection, in particular to an on-line detection and diagnosis method for switching programs of on-load tap changers. Background technique [0002] OLTC (On Load Tap Changer, on-load tap changer) is an essential and important device for UHV DC transmission. Its main function is to maintain a constant voltage on the DC side of the converter valve through voltage regulation without interrupting the load current. And compensate the voltage change of the AC system, keep the firing angle of the converter valve in the optimal operating range, and avoid commutation failure or even DC blocking caused by voltage fluctuations. Taking the ±800kV two-terminal DC transmission system as an example, there are 48 OLTCs installed inside the converter transformer on average every day, and more than 500 voltage regulation operations are performed. The operations are frequent and the role is important. The...

Claims

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Application Information

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IPC IPC(8): G01R31/327G01H17/00
CPCG01H17/00G01R31/3272G01R31/3275
Inventor 许渊毕建刚袁帅郑建弓艳朋常文治杜非王广真付德慧杨宁何文林郑一鸣李旭赵强
Owner CHINA ELECTRIC POWER RES INST
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