케이블 특성에 의한 점화위험성 예측에 관한 실험적 연구

강준구; 권영철; Joon Goo Kang; Young Chel Kweon

Journal of the Korean Industrial and Engineering Chemistry, Vol.14, No.5, 599-604, August, 2003

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케이블 특성에 의한 점화위험성 예측에 관한 실험적 연구

Experimental Study on the Prediction of Ignition Risk by Cable Characteristics

강준구, 권영철 ^{1, †}

산업기술시험원 에너지설비팀, 서울 152-848
¹선문대학교 기계공학과, 충남 336-840

Joon Goo Kang, and Young Chel Kweon^{1, †}

Energy Evaluation Team, Korea Testing Laboratory, Seoul 152-848, Korea
¹Dep. of Mech. Eng., Sunmoon University, Chungnam 336-840, Korea

E-mail:

초록

케이블 특성에 의한 점화위험성을 예측하기 위하여 RLC 변화에 대한 불꽃점화 실험과 케이블 허용인덕턴스의 L/R 비율에 대한 실험을 수행하였다. 허용인덕턴스의 비율은 Bass와 IEC/EN의 계산과 서로 비교하였다. 불꽃점화시험을 위해 표준불꽃 점화시험 장치를 그리고 다른 농도를 가진 3종류의 혼합가스를 사용하였다. 실험결과로부터 저항성, 용량성, 유도성의 점화위험성은 서로 다르게 관찰되었다. 불꽃점화시험에 의한 전압과 전류파형은 저항성과 유도성의 경우에 구형파를 용량성의 경우에 톱니파의 형태를 가졌으며, 회로 개폐순간의 발생전압은 유도성이 저항성과 용량성보다 크게 나타났다. 한편, 허용 L/R 비율은 전원저항과 케이블저항이 높을수록 증가하며, 전압이 증가할수록 감소하였다.

An experimental study on the spark test by RLC changes and the L/R test by cable allowable induction was carried out to predict the ignition risk by characteristics. Experimental data obtained from L/R test were compared with the those of Bass and IEC/EN. The standard spark test apparatus and three gas mixtures with each different concentration are used as the experimental apparatus and explosive gas mixtures. From the present results, it was observed that resistive, capacitive and inductive properties were shown different risk characteristics. The inductive voltage measured during circuitry on/off was much larger than resistive and capacitive cases. As a result of L/R ratio test, it was found that the allowable L/R ratio increased as the circuit resistance and the cable resistance increased and decreased as the voltage increased.

Keywords:cable characteristics;ignition energy;explosive gas mixture;ignition risk;explosion;L/R ratio

[References]

Zabetakis MG, Flammability Characteristics of Combustible Gases and Vapours, U.S. Bureau of Mines, Bulletin 627 (1965)
Olenik H, Rentzsch H, Wettstein W, Explosion Protection Menual, 2nd edition (Brown, Boveri & CIE) (1984)
IEC 60079-4, Method of Test for Ignition Temperature (1975)
Frey G, Ergebnisse Nauer Untersuchungen uber Die Eigensicherheit Elektrischer Gerate und Anlagen Bericht Nr. 41, Elekrie 14 (1960)
Streich R, Fortschritte und Neue Physikalische Erkenntnisse auf dem Gebiete des Explosionsschutzes, Industrie-Anzeiger 80 (1958)
Wehrli P, Eigensicherheit Elektrischer Stromkreise, Bulletin SEV56 (1965)
White AG, Freytag HH, Handbuch der Raumexplosionen, Verlag Chemie GmbH, Weinheim/Bergstrabe (1965)
Mulier K, Eigensichere Stromkreise, ETZ-A 78 (1957)
Wehner E, Elektrische Eigensicherheit beim Schieben, ETZ-A 76 (1955)
Gehm KH, Uber den bau und Die Verwendung von Explosions Ges Chutzten Mebund Regelgeraten (Regeltechnik) (1957)
BSI 5501-7 Electrical Apparatus for Potentially Explosive Atmospheres. Intrinsic Safety "i" (1977)
Bass HG, Intrinsic Safety Instrumentation for Flammable Atmospheres (Quartermaine House Ltd. U.K.) (1984)
IEC 60079-11, Electrical Apparatus fir Explosive Gas Atmospheres, Intrinsic Safety "i" (1999)
EN 50020, Electrical Apparatus for Potentially Explosive Atmospheres. Intrinsic Safety "i" (1977)

[Related Articles]

[1] Zabetakis MG, Flammability Characteristics of Combustible Gases and Vapours, U.S. Bureau of Mines, Bulletin 627 (1965)

[2] Olenik H, Rentzsch H, Wettstein W, Explosion Protection Menual, 2nd edition (Brown, Boveri & CIE) (1984)

[3] IEC 60079-4, Method of Test for Ignition Temperature (1975)

[4] Frey G, Ergebnisse Nauer Untersuchungen uber Die Eigensicherheit Elektrischer Gerate und Anlagen Bericht Nr. 41, Elekrie 14 (1960)

[5] Streich R, Fortschritte und Neue Physikalische Erkenntnisse auf dem Gebiete des Explosionsschutzes, Industrie-Anzeiger 80 (1958)

[6] Wehrli P, Eigensicherheit Elektrischer Stromkreise, Bulletin SEV56 (1965)

[7] White AG, Freytag HH, Handbuch der Raumexplosionen, Verlag Chemie GmbH, Weinheim/Bergstrabe (1965)

[8] Mulier K, Eigensichere Stromkreise, ETZ-A 78 (1957)

[9] Wehner E, Elektrische Eigensicherheit beim Schieben, ETZ-A 76 (1955)

[10] Gehm KH, Uber den bau und Die Verwendung von Explosions Ges Chutzten Mebund Regelgeraten (Regeltechnik) (1957)

[11] BSI 5501-7 Electrical Apparatus for Potentially Explosive Atmospheres. Intrinsic Safety "i" (1977)

[12] Bass HG, Intrinsic Safety Instrumentation for Flammable Atmospheres (Quartermaine House Ltd. U.K.) (1984)

[13] IEC 60079-11, Electrical Apparatus fir Explosive Gas Atmospheres, Intrinsic Safety "i" (1999)

[14] EN 50020, Electrical Apparatus for Potentially Explosive Atmospheres. Intrinsic Safety "i" (1977)