Tank-type circuit breaker partial discharge ultrasonic signal denoising and time difference identification method
A technology of ultrasonic signal and partial discharge, which is applied in the direction of circuit breaker testing, instrumentation, measuring electricity, etc. It can solve the problems of ultrasonic signal denoising, affecting positioning accuracy, difficult electrical signal time, etc., and achieves the effect of accurate and automatic positioning
Pending Publication Date: 2021-02-05
国网冀北电力有限公司超高压分公司
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The characteristic of this method is that the electrical signal can be used to quantitatively determine the strength of the discharge, but due to the influence of electromagnetic interference, it is sometimes difficult to determine the time when the electrical signal appears, which in turn affects the accuracy of positioning
[0006] Based on the physical and chemical phenomena generated during discharge, the monitoring methods for partial discharge of circuit breakers mainly include pulse current method, ultrasonic method, ultra-high frequency method and decomposition gas detection method; however, the existing methods and methods are difficult to achieve a thorough ultrasonic signal Denoising and fault location through time difference, so it is necessary to re-develop a method to solve the current problems
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[0041] refer to Figure 1 to Figure 11 A partial discharge ultrasonic signal denoising and time difference identification method of a tank circuit breaker includes the following steps,
[0042] 1) Use the ultrasonic sensor to obtain the partial discharge ultrasonic signal of the tank circuit breaker;
[0043] 2) Based on the cross-correlation coefficient, the optimal wavelet function for analyzing the partial discharge ultrasonic signal of the tank circuit breaker is selected, and the signal decomposition, threshold processing and signal reconstruction based on the discrete wavelet transform are used to realize the denoising of the ultrasonic signal;
[0044] 3) Apply the signal after denoising processing to obtain the partial discharge ultrasonic PRPD spectrum of the typical defect of tank circuit breaker;
[0045] 4) The energy criterion method is used to automatically calculate the ultrasonic signal energy and extract the signal time difference.
[0046]Furthermore, in st...
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The invention discloses a tank-type circuit breaker partial discharge ultrasonic signal denoising and time difference identification method. The method comprises the following steps: 1) acquiring a tank-type circuit breaker partial discharge ultrasonic signal by using an ultrasonic sensor; 2) selecting an optimal wavelet function for analyzing the partial discharge ultrasonic signal of the tank-type circuit breaker based on the cross correlation coefficient, and adopting signal decomposition, threshold processing and signal reconstruction based on discrete wavelet transform to realize ultrasonic signal denoising; 3) acquiring a typical defect partial discharge ultrasonic PRPD map of the tank circuit breaker by using the denoised signal; and 4) adopting an energy criterion method to automatically calculate ultrasonic signal energy and extract signal time difference. Db14 is selected as an optimal wavelet function for analyzing the partial discharge ultrasonic signal of the tank-type circuit breaker based on a cross correlation coefficient, ultrasonic signal denoising is realized by adopting signal decomposition, threshold processing and signal reconstruction based on discrete wavelet transform, and meanwhile, the time difference of the ultrasonic signal is automatically extracted by adopting an energy criterion method.
Description
technical field [0001] The invention relates to a method for denoising and time difference identification of partial discharge ultrasonic signals of tank type circuit breakers. Background technique [0002] The tank circuit breaker is a circuit breaker with an arc extinguishing chamber located in a grounded metal shell. It is an important control and protection equipment in substations and power systems [1-3]. The tank circuit breaker uses sulfur hexafluoride as its insulating medium and arc extinguishing medium. Convenience and other advantages. [0003] During the manufacture, transportation, installation and operation of tank circuit breakers, due to factors such as process, mechanical impact, switching operation or electrical aging, insulation defects will occur inside it. Under the action of test voltage or rated voltage, when the concentrated electric field strength at the insulation defect reaches the breakdown field strength of this area, partial discharge phenome...
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Login to View More IPC IPC(8): G01R31/12G01R31/327
CPCG01R31/1209G01R31/1227G01R31/327
Inventor 张金祥麻震烁李旸范曦光陈东明李沐付铠玮严逍彭凯董冠初侯宜男谭文玉
Owner 国网冀北电力有限公司超高压分公司