Effective Installations Technique of Grounding Conductors for Metal Oxide Surge Arrestors

배전피뢰기용 접지도선의 효과적인 설치기법

  • Published : 2002.06.01

Abstract

This paper deals with the effects of grounding conductors for metal oxide surge arresters. When surge arresters are improperly installed, the results can cause costly damage of electrical equipments. In particular, the route of surge arrester connection is very important because bends and links of leads increase the impedances to lightning surges and tend to nullify the effectiveness of a grounding conductor. Therefore, there is a need to know how effective installation of lightning surge arresters is made in order to control voltage and to absorb energy at high lightning currents. The effectiveness of a grounding conductor and 18 [㎸] metal oxide distribution line arresters was experimentally investigated under the lightning and oscillatory impulse voltages. Thus, the results are as follows; (1) The induced voltage of a grounding conductor is drastically not affected by length of a connecting line, but it is very sensitive to types of grounding conductor. (2) The coaxial cable having a low characteristic impedance is suitable as a grounding conductor. (3) It is also clear from these results that bonding the metal raceway enclosing the grounding conductor to the grounding electrode is very effective because of skin effect. (4) The induced voltages of grounding conductors for the oscillatory impulse voltages are approximately twice as large as those for the lightning impulse voltages.

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References

  1. 한국전력공사 ; '장기 송변전 설비계획', pp. 239, 2001. 3
  2. 李福熙 ; '高電壓大電流工學', 淸文閣, pp. 64-69, 1993
  3. 白龍鉉, 李福熙 ; '電力傳送工學', 普成文化社, pp. 235-247, 1996
  4. Joseph L. Koepfinger ; 'IEEE guide for the connection of surge arresters', IEEE Std 1299/C62.22, 1996
  5. David B. Miller, Andre E. Lux, Paul R. Barnes ; 'The effects of steep-front, short-duration impulse on power distribution components', IEEE Transactions, Vol. 5, No. 2, 1990. 4
  6. NESC handbook ; 'Surge arresters', Sec. 19, pp. 142-144, 1997
  7. 副馬光積, 堀內和夫, 電磁氣學, コロナ社, pp.60-79, 1999
  8. 전기설비 기술기준 ; '가공 전선로 지지물의 기초 안전율', 산업자원부 고시 제 1993-70호
  9. 배전 설계기준(3800) ; '배전선 내뢰기준(잠정)', 한국전력공사, 1995