Device and method for measuring sudden/large-dynamic range partial discharge ultrasonic signal

Abstract

The invention discloses a device for measuring a sudden / large-dynamic range partial discharge ultrasonic signal, which comprises four parallel liner measurement channels with different ranges, in addition, a logarithm measurement channel is also connected in parallel, wherein each channel comprises an A / D. The method comprises the steps of: S1, sending signals to the four liner measurement channels with different ranges after being amplified and filtered, and synchronously sampling and processing the signals by the A / D; S2, sending the amplified and filtered signals to the logarithm measurement channel, and synchronously sampling and processing the signals by the A / D; S3, in the step S2, if the sampling data exceeds the preset trigger level by at least continuous three times, stopping sampling after 19 milliseconds, storing the sampling data of the liner measurement channels with different ranges before and after triggering within 20 milliseconds, and selecting the sampling data with highest quantization accuracy as the final result. The device for measuring the sudden / large-dynamic range partial discharge ultrasonic signal is capable of accurately collecting a partial discharge ultrasonic signal, and is also capable of avoiding the problems of false triggering caused by noise and smaller signal missing.

Description

technical field [0001] The invention relates to a measuring device for sudden / large dynamic range partial discharge ultrasonic signals, which is suitable for high-precision measurement of partial discharge ultrasonic signals with a dynamic range of 100dB. The invention also relates to a method of measuring bursty / high dynamic range ultrasonic signals using said device. Background technique [0002] The partial discharge inside the high-voltage electrical equipment will generate ultrasonic signals, which can be detected by multiple ultrasonic sensors installed on the equipment casing, and can be transmitted to multiple sensors according to the time difference of the ultrasonic signal (such as figure 1 As shown in the waveform characteristic diagram of the partial discharge ultrasonic signal), the location of the partial discharge is calculated by using the method of spatial analytic geometry, so as to realize the location of the fault. [0003] Due to the randomness of parti...

AI Technical Summary

Problems solved by technology

For ultrasonic signals with a large dynamic range, the traditional linear signal trigger method is usually difficult to correctly set the appropriate trigger level because the size of the signal cannot be predicted. Many invalid data are generated due to false triggering of sampling. If the trigger level is high, it is likely to miss the sampling of smaller signals and lose valid measurement information.

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