Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
권호 표지

Magnetic Field Measuring System by using Loop-type Sensor

루우프형 센서를 이용한 자장측정계

  • Lee, Bok-Hee (Dept. of Electrical Engineering, College of Engineering, Inha University) ;
  • Kil, Gyung-Suk (Dept. of Electrical Engineering, College of Engineering, Inha University) ;
  • Park, Dong-Hwa (Dept. of Electrical Engineering, College of Engineering, The University of Inchon)
  • 이복희 (인하대학교 공과대학 전기공학과) ;
  • 길경석 (인하대학교 공과대학 전기공학과) ;
  • 박동화 (시립 인천대학교 공과대학 전기공학과)
  • Published : 1995.05.31
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Abstract

This paper deals with the active magnetic field measuring system which can measure the time-varying magnetic fields generated by power installations and lightning discharges. The magnetic field measuring system consists of the loop-type magnetic field sensor and the active integrator operated by a differential amplifier. The theoretical principle and design rule of the time-varying magnetic field measuring device and the calibration apparatus are introduced. From the calibration experiments, the frequency bandwidth of the full measuring system ranges from 270 Hz to about 2.3 MHz and the response sensitivity for magentic field strength is 128 $mV/{\mu}T$, respectively, and the calculated B-field values in the center of the loop-type sensor versus the the applied current made with a region of ${\pm}3\;%$error. The actual survey experiments by using lightning impulse current and oscillating impulse current were performed, the results of comparision between the input current waveforms and the magnetic field waveforms are a good agreement with each others and their deviations are less than 0.5 %.

본 논문은 전력설비와 뇌방전에 의하여 발생하는 시변자장을 측정할 수 있는 능동성 자장측정계에 대하여 기술하였다. 자장측정계는 루우프형 센서, 차동증폭기로 동작되는 능동성 적분기로 이루어졌다. 시변자장측정계와 교정장치의 이론적 원리 및 설계방법에 대하여 제시하였으며, 교정실험으로부터 주파수대역 $270\;Hz\;{\sim}\;2.3\;MHz$, 응답감도 128 $mV/{\mu}T$를 얻었고, 교정실험계에서 자장센서범위의 자계의 세기는 ${\pm}3\;%$이내로 균일하였다. 적용실험으로는 대전류 발생장치에 의하여 모의 뇌임펄스전류와 진동성 임펄스전류를 발생시켜서 인가전류와 검출자장의 파형을 비교하였으며, 이의 결과는 거의 일치하였고, 편차는 0.5 %이내이었다.

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