摘要
高压输电线中的电流测量大都采用铁芯式电流互感器。由于铁芯的非线性特性,一次测电流过大或含有高次谐波分量时,会出现磁路饱和现象,使电流互感器二次测电流数值和波形发生失真,从而引起测量精度下降。文中,设计了一种干涉式光纤电流传感器,提出了使用Rogowski线圈进行电流-电压转换,利用压电晶体实现相位调制,用迈克尔逊干涉仪进行相位检测的方法,解决了在高压端无源情况下,由电流转换的电压小的问题,提高了传感器的精度、可靠性和测量范围。
Current in high voltage wire is mostly measured by mutual induction transducer with iron core. Because of the nonlinear feature of iron core, when its first-order side current is too large or it contains high-order harmonic waves, magnetic track saturation is generated.As a result,its secon-order side current and waveform are distorted,thus the measure accuracy is decreased. A novel optical fiber current sensor is designed in the paper. Rogowski coil are used to carry out current-voltage conversion.Piezoelectric and a Michelson interferometer are used to demodulate phase. So the accuracy, reliability and measurement range of the sensor are improved.
出处
《仪表技术与传感器》
CSCD
北大核心
2006年第4期4-5,共2页
Instrument Technique and Sensor
