A Partial Discharge Ultrasonic Localization Method and Device Based on Controllable Response Power
A technology of response power and positioning method, applied in the direction of measuring device, fault location, measuring electricity, etc., can solve the problem of not realizing partial discharge positioning, and achieve the effect of simple structure, high signal-to-noise ratio of detection signal and small volume
Active Publication Date: 2021-05-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
Although F-P fiber optic ultrasonic sensors have been applied in practical electrical equipment, partial discharge localization has not yet been realized
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[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0034] The present invention aims at the deficiencies of current partial discharge ultrasonic detection methods for large electrical equipment, and proposes a partial discharge ultrasonic positioning method based on controllable response power (Steered Response Power, SRP), such as figure 1 The flow chart of the partial discharge ultrasonic localization method shown, the method includes the following steps:
[0035] Step 1: Preprocess the signal generated by the signal generating device and transmit it to the F-P fiber optic ultrasonic sensor array for signal acquisition;
[0036] Step 2: Perform time-domain interpolation on the sampling signals received by the sensor, and establish a generalized cross-correlation function model based on the interpolated sampling signals. The modeling method is as follows:
[0037] Assume that the signal detected by ...
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The invention belongs to the technical field of on-line partial discharge monitoring of high-voltage electrical equipment, and in particular relates to an ultrasonic localization method and device for partial discharge based on controllable response power. In order to overcome the shortcomings of the current partial discharge ultrasonic positioning method and device structure, weak anti-interference ability, etc., the present invention uses the F-P fiber optic ultrasonic sensor array to detect the ultrasonic waves generated by partial discharge, converts the acoustic signal into an optical signal and propagates through the optical fiber, and then Under the action of ultrasonic waves, the F-P fiber optic ultrasonic sensor array transmits the returned interference light through the photoelectric amplifier to the signal processing unit for signal acquisition and processing, and finally obtains the coordinates of the partial discharge point of the high-voltage electrical equipment. The invention is not subject to strong electromagnetic interference at the operating site, has strong noise resistance and robustness, and can provide relatively accurate positioning with only a short signal sequence, effectively avoiding the influence of aliasing waves, It is suitable for the localization of partial discharge of high-voltage electrical equipment.
Description
technical field [0001] The invention belongs to the technical field of on-line partial discharge monitoring of high-voltage electrical equipment, and in particular relates to an ultrasonic localization method and device for partial discharge based on controllable response power. Background technique [0002] Partial discharge is the main cause of insulation deterioration and destruction of power equipment. Strong partial discharge will quickly reduce the insulation strength. Therefore, on-line monitoring of partial discharge of large-scale power equipment is of great significance. Commonly used detection methods mainly include very high frequency (VHF) pulse current detection method and ultra high frequency (UHF) electromagnetic wave detection method. However, these two detection methods detect electrical signals and are easily interfered by electromagnetic signals; ultrasonic detection method is The ultrasonic signal generated by the partial discharge inside the equipment i...
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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 王伟高超飞宋树王杨超于雷王世杰王鹏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)