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Online state monitoring method for on-load tap changer of converter transformer

A technology of converter transformer and on-load tapping, which is applied in the direction of circuit breaker testing, instruments, measuring electricity, etc., can solve the problems of heavy workload, low measurement accuracy, and low efficiency, so as to prevent sudden failures and reduce Sudden failure, ensuring the effect of safe and stable operation

Inactive Publication Date: 2016-11-16
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages are heavy workload, low efficiency and low measurement accuracy, and failure to detect equipment failures within maintenance intervals in time, and the particularity of converter transformers and their on-load tap-changers, this method is not suitable for their safe and stable operation

Method used

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  • Online state monitoring method for on-load tap changer of converter transformer
  • Online state monitoring method for on-load tap changer of converter transformer
  • Online state monitoring method for on-load tap changer of converter transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 2.1 During the shifting process, when the contacts of the converter transformer on-load tap-changer are separated, it will cause weak vibration, but when the separated contacts are closed and the paddles connected to the contacts move at the same time, a strong impact will occur. The contacts and paddles generate a large vibration amplitude. According to this process principle, the method of the present invention utilizes the TVAS vibration acquisition device produced by Nanjing Unite Company to collect vibration signals.

[0024] 2.2 Perform denoising processing on the collected vibration signal.

[0025] denoising process such as image 3 As shown in the figure, the whole process of tap changer vibration is shown in the figure. The data in the box is used to analyze the signal source of the noise. The frequency spectrum analysis of this signal source is as follows: Figure 4 , 5 shown.

[0026] Figure 4 , 5 It is the time domain diagram and frequency domain dia...

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Abstract

The invention relates to an online state monitoring method for an on-load tap changer of a converter transformer. The online state monitoring method comprises the steps of: (1) acquiring vibration signals of a contact and a dialing piece by means of a vibration signal acquisition device during the shifting process of the on-load tap changer of the converter transformer; (2) performing denoising processing on the acquired vibration signals; (3) and comparing the denoised vibration signals of the on-load tap changer with vibration signals in a normal state, judging whether the on-load tap changer operates normally, and giving out anomaly prompting information if the on-load tap changer operates abnormally. The trial proves that, sudden failures can be effectively prevented and reduced after adopting the online state monitoring method provided by the invention, and the safe and reliable operation of the converter transformer can be further ensured.

Description

technical field [0001] The invention relates to an on-line state monitoring method for an on-load tap changer of a converter transformer. Background technique [0002] The converter transformer is a crucial key equipment in the ultra-high voltage direct current transmission project, and is the core equipment of the interface between the converter and the inverter in the AC and DC transmission systems. Its input and safe operation are the key and important guarantee for the project to obtain power generation benefits. The key role of the converter transformer requires it to have high reliability and high technical performance. Because of the joint action of AC and DC electric fields and magnetic fields, and the different parameters of various engineering systems, the structure of the converter transformer is special and complex, the key technology is difficult, and it has strict requirements on the manufacturing environment and processing quality. The converter transformer ...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/3271
Inventor 徐辉唐鑫刘志远邹洪森王宏丽张炯张斌赵欣洋尹磊秦有苏徐天书林恒侯亮吴昊王思杨稼祥张思齐赵希洋叶涛仇利辉李磊李敏靳武黄欣陈炳华张坤
Owner STATE GRID CORP OF CHINA
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