Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Implantation of DC Optical Current Sensor Based on Faraday Effect for HVDC

페러데이 효과를 이용한 특고압 직류전송용 광전류 센서 구현

  • Received : 2019.04.15
  • Accepted : 2019.05.29
  • Published : 2019.05.31
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Abstract

We proposed and demonstrated DC(direct current) optical current sensor based on Faraday effect for HVDC(high voltage direct current). The RIG((Bi1.3Gd0.43Y1.27)Fe5O12) was adopted as Faraday device because of its high Verdet constant and good thermal stability. The differential amplification scheme for signal processing was present. The sensor showed high linear response for the input current. Measurement range of the sensor was 0~200A and measurement error was less than 1%.

Keywords

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Fig. 1. Polarization rotation induced by Faraday effect in faraday device.

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Fig. 2. Schematic structure of proposed optical current sensor.

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Fig. 3. Fabricated optical current sensor.

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Fig. 4. Electronic circuit for signal processing.

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Fig. 5. Experimental set-up for measuring the performance of current sensor.

Table 1. Material and function of the optical devices

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Table 2. Applied current Vs. acquired current value after signal processing.

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