采用激光供能方法的光纤电流互感器

研制了一种新型的电流互感器,高压端采用Rogowski线圈作为电流传感头.传感头输出信号经A/D转换器变成数字量后编码成曼彻斯特码,由塑料光纤发送到低压端,用激光供能的方法为高压端的电子器件提供能源.低压端用D/A转换器恢复母线电流信号.该方法克服了传统电磁式电流互感器的固有缺点,也解决了直接从电力母线获得高压端电子器件工作能量的方法所带来的死区问题,加快了电子式电流互感器的实用化进程.

Optic-Fiber Current Transducer Powered with Laser Energy

A novel current transducer which uses Rogowski core as current sensor head was designed. The signal from sensor head is sampled by a A/D converter, then the digital result is transformed to Manchester code and send to low voltage part by plastic fiber. Energy for electronic devices on the high voltage part is supplied with laser from low voltage part. At low voltage part, a D/A converter is used to resume the primary current signal. The design conquers the inherent defects of traditional electromagnetic current transducer, and resolves the problem of dead area in powering the electronic devices in high voltage part from the power line directly. The new current transducer will accelerate the practical process of electronic current transducer.