宽声频局部放电信号的高速采集方法

Method of Broadband Acoustic Frequency Partial Discharge Signal High-speed Acquisition System

针对电气设备局部放电实时检测缺乏有效手段的问题,采用FPGA技术构建了双通道振动信号的高速采集系统,以实现对宽频声波振动信号的实时测量。首先,该系统通过FPGA建立各功能模块模型并施加不同频率的振动信号进行实验,最后,结合模拟放电设备采集对比宽声频振动信号。结果表明,在20 Hz～20 kHz的低频频段内,信号峰值达到3 V,衰减时间为12 ms,而在20～200 kHz的高频频段内,信号峰值为0. 15 V,衰减时间为1 ms。因此,基于FPGA的高速采集系统进行双路采集十分必要,并为电气设备局部放电宽声频声波检测与预警提供一种新的解决思路。

In view of the lack of effective means to detect the partial discharge of electrical equipment in real time,a high-speed acquisition system of dual-channel vibration signal using FPGA technology that realized the real-time measurement of broadband acoustic vibration signal was constructed.Firstly,the functional module model of the detection system was established by the FPGA.Then the experiment was carried out and different frequencies of vibration signals were acquired.Finally,the wide audio vibration signal was captured with the analog discharge equipment.The results show that the signal peak reaches 3 V and the decay time is 12 ms in the low frequency band from 20 Hz to 20 kHz.And in the high frequency band from 20 kHz to 200 kHz,the signal peak is 0.15 V and the decay time is 1 ms.Therefore,the high-speed acquisition system based on FPGA for dual channel acquisition is necessary and it provides a new solution for the partial discharge detection of wide frequency acoustic wave and early warning of electrical equipment.