Distributions of the Magnetic Flux Density Near Down-Conductors Due to Various Impulse Currents

임펄스전류에 의한 인하도선 주위에서 자속밀도의 분포

  • 이복희 (인하대학 전기공학과) ;
  • 장근철 (인하대학 전기공학과) ;
  • 이수봉 (인하대학 전기공학과) ;
  • 강성만 (인하대학 전기공학과) ;
  • 이승칠 ((주)한진중공업)
  • Published : 2004.02.01

Abstract

This paper deals with the behaviors of magnetic flux density near down-conductors by lightning currents. The background on the principle of magnetic flux density measurements using the RL self-integrating magnetic field sensor was described. The magnetic flux density measuring device consisting of RL self-integrating magnetic field sensor and differential amplifier was designed and fabricated. The frequency bandwidth of the magnetic flux density measuring system ranges from 200 Hz to 300 KHz and the response sensitivity was 0.126 $\mu$T/㎷ The distributions of the magnetic flux density near down-conductors due to impulse currents with various rise times were analyzed as a parameter of the bonding conditions and materials of conductor and wiring conduits. The magnetic flux density due to impulse currents was inversely proportional to the distance between the down-conductor and measuring point. The amplitude of the magnetic flux density for PVC Pipe with down-conductor was 72 $\mu$T/㎷ at the distance of 1m and was higher than for steel conduits and coaxial cable. Finally the magnetic flux density is increased with increasing the di/dt it and oscillation frequency of lightning currents in this experimental ranges.

Keywords

Magnetic flux density;Impulse current;Down-conductor;Magnetic field sensor;EMI/EMC

References

  1. 木島 均, '接地と 雷防護', 電子情報通信學會, pp.15-30, 2001
  2. 이복희, 강성만, 이승칠, 이동문, 안창환, '뇌보호설비용 인하도선의 설치조건에 따른 전위상승', 대한전기학회 하계학술대회 논문집, pp.1724-1725, 2001
  3. 이복희, 강성만, 이승칠, 엄주홍, 이경옥 '인하도선 주변에서 발생하는 자장의 억제', 대한전기학회 전기물성.응용부문회 추계학술대회 논문집, pp.216-218, 2001
  4. 정시환, 유연표 '전력설비의 전자계와 민원', 대한전기학회 하계학술대회 논문집, pp. 93-96, 2001
  5. Peter Hasse and Jojannes Wiesinger, 'Handbuch fur Blitzschutz und Erdung, 4ed, Richard Pflaum Verlag Gmbh & Co. KG, pp.85-126, 1993
  6. AC fields working group of the IEEE, 'An Evaluation of Instrumentation Used to Measure AC Power System Magnetic Fields', IEEE Trans. PD, Vol. 6, No. 1, 1991 https://doi.org/10.1109/61.103761