基于正交双路光纤电流互感器暂态信号处理

Transient signal processing based on quadrature dual-path optical current transducer

提出利用正交双路光纤信号传输的处理方法,满足了光纤电流互感器在电力系统暂态保护应用中的实时处理要求。论述了磁光式光电电流互感器(MOCT)系统的原理,其中普通MOCT系统通过测量载流导体周围线性偏振光偏振面的旋转角度,间接测量出导体中的电流值;正交双路MOCT系统不是用信号滤波的方法得到交/直流信号,而是直接用正交双路信号的信息进行数字信号处理,得到偏转角度,从而获得导线电流值。基于Matlab的仿真实验说明正交双路MOCT系统测量和监控高压输电线中传输电流的方法实时性强、延迟小、精度高。

An approach to producing and processing quadrature dual-path optical signal is presented to meet the real-time processing requirement of electric power transient protection with optical current transducers. The principle of MOCT（Magnetic Optical Current Transducer）is discussed. In common MOCT system,the amperage of a conductor can be indirectly got by measuring the revolvable angle of the linear polarization＇s optical plane around the carrying current conductor with signal filter. While in quadrature dual-path MOCT system,it is directly got by measuring the revolvable angles with digital signal processing. Simulation with Matlab proves that the latter is of less processing delay and high precision in high-voltage transmission line current measuring and monitoring. This project is supported by Research Fund of Education Office of Shaanxi Province （04JK310） and Research Fund of Weinan Teachers College（03YKS009）.