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.
Instrument Technique and Sensor