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


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.


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


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