一种全数字化高压电流互感器在线校验系统  

An All-Digital On-Line Calibration System for High Voltage Current Transformer

作　　者：童悦[1] 李红斌[1] 张明明[1] 阎东[2] 王壅 

机构地区：[1]华中科技大学电气与电子学院,武汉430074 [2]河南电力试验研究院,郑州450000

出　　处：《电工技术学报》2010年第8期59-64,84,共7页Transactions of China Electrotechnical Society

摘　　要：随着电子技术和数字信号处理技术广泛应用于电力系统,电子式互感器技术日趋成熟。由于动态范围广、频带宽、无磁饱和等优点,电子式互感器已经开始取代传统式互感器应用于电力系统和其他工业领域。本文提出一种以高准确度的钳形空心线圈为电流传感器,以光纤传输系统为信号传输和供电方式,并通过虚拟仪器实现软件的数字积分器和加四阶矩形卷积窗运用FFT算法的全数字化高压电流互感器的在线校验。可以在不断电的情况下对现有的高压电流互感器进行监控,大大地提高了电力系统一次设备的可靠性。实验结果表明,该系统具有0.05级以上的准确度[1],挂网运行试验证明该系统易于现场操作,可靠性强。As the developing of electronics technology and digital signal processing,electronic current transformer is becoming mature. Because of its wide dynamic range and frequency band,and non magnetic saturation,the electronic current transformer is replacing the traditional current transformer in power system. As an application,an all-digital on-line calibration system for high voltage current transformer is proposed in this paper. It is based on a kind of high accurate clamp-shape air core coil for sensor and uses optical fiber transmission system for signal transmission and power supply. Finally it realizes the digital integrator and fourth-order convolution window algorithm for error calculation method by the virtual instrument in personal computer. This system can monitor high voltage current transformer on line,and improves the reliability of power system greatly. The experimental results show that,this system can reach the 0.05 accuracy class,and the on site operation results prove that it easy to operation and has high reliability.

关 键 词：钳形空心线圈 在线校验系统 数字积分器 光纤传输系统 全数字化 

分 类 号：TM932[电气工程—电力电子与电力传动]