特快速暂态过电压光学测量系统的设计

发布时间：2018-10-20 16:41

【摘要】：提出一种应用Pockles效应的特快速暂态过电压(VFTO)光学测量方法。通过光学敏感头感应一次VFTO信号,并将电压的变化信息通过光缆传输至电气单元进行解析,最终得到实际电压。该传感器采用光学测量方式,具有可靠性高、抗干扰能力强、测量精度高、测量频带宽的优点。设计制作的新型光学传感器的低频截止频率低于10 Hz,高频截止频率高于1 GHz。对隔离开关操作所引发的VFTO进行了测量试验,通过同步触发装置同时采集两侧安装的光学传感头和电容式传感头信号,对比验证了VFTO光学测量方法的可行性。试验结果表明:光学测量方式与电容式测量方式均反映了刀闸分合闸的过程,2种方式的分合闸持续时间测量结果吻合较好;电容式测量方式测得的VFTO振荡幅度明显小于光学方式的测量结果,光学测量方式在高频段性能要优于电容式测量方式。
[Abstract]:This paper presents an optical measurement method for very fast transient overvoltage (VFTO) based on Pockles effect. The VFTO signal is induced by the optical sensor head, and the voltage change information is transmitted to the electrical unit through the optical cable for analysis. Finally, the actual voltage is obtained. The sensor has the advantages of high reliability, strong anti-interference ability, high measuring precision and frequency bandwidth. The low frequency cutoff frequency of the new optical sensor is less than 10 Hz, and the high frequency cutoff frequency is more than 1 GHz.. The VFTO caused by the operation of the isolation switch is measured and the signals of the optical sensor head and capacitive sensor head installed on both sides are simultaneously collected by the synchronous trigger device. The feasibility of the optical measurement method of VFTO is compared and verified. The experimental results show that both optical measurement and capacitive measurement reflect the process of switch opening and closing, and the results of the two methods are in good agreement with each other. The amplitude of VFTO oscillation measured by capacitive measurement is obviously smaller than that of optical measurement, and the performance of optical measurement is better than that of capacitive measurement in high frequency band.
【作者单位】：武汉大学电气工程学院;中国电力科学研究院;南瑞航天(北京)电气控制技术有限公司;
【基金】：国家电网公司科技项目(GY71-14-080)~~
【分类号】：TM595

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