测量脉冲大电流的四光路光学电流传感器技术

Optical current sensor with four paths for measuring high pulse current

在传统光学电流传感器技术的基础上,提出了一种四光路光学电流传感器,其通过四路输出信号可准确确定偏转角,使电流的测量范围不受正弦函数的单调性的限制,从而提高了电流的测量范围。配合四光路结构,提出了新的反正切函数数据处理方法,其不存在角度不灵敏区、可纠正原始数据的缺陷,从而提高了测量精度。实测了充电电压为4.5 kV、电容为50μF和导线有效穿过磁光探头14次的快开快门的总短路电流,其峰值达85 kA,与理论值87 kA能较好地吻合,从而证明了四光路光学电流传感器可有效地测量脉冲大电流。

Based on conventional optical current sensor, a new measuring technology of optical current sensor with four paths was put forward. As its four output signals were accurately able to obtain the azimuth of polarization, the measuring scope of current was out control of the monotone zone of sine function and was enlarged. In order to assist optical current sensor with four paths, a new experimental data processing method with arc-tangential function was introduced. As it didn＇t exist insensitive zone and was able to correct the drawback of original data, it could enhance measuring precision. The whole current which was shutter＇s short circuit through the magneto-optical sensing element with 14 times was measured at 4.5 kV voltage and 50 μF capacity. In agree with theoretical calculation value of 87 kA, the maximum experimental current was 85 kA. So the optical current sensor with four paths measuring high pulse current proved to be effective.