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모선 및 TR Bank 구성방식에 따른 TRV 특성에 관한 연구
조계술(Kyeh-Sool Cho),최홍규(Hong-Kyoo Choi),박준열(Jun-Yeal Park),서범관(Beom-Gwan Seo),조시현(Shi-Hyun Cho),장래창(Rae-Chang Jang),이강수(Kang-Soo Lee) 한국조명.전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
전력설비의 고장 시 신속하고 안전하게 고장회로를 분리하기 위한 차단기는 선정 시 고장전류의 크기와 함께 과도회복전압(TRV : Transient Recovery Voltage)이 검토되어야 한다. 차단기별 적합한 과도회복전압(TRV)의 평가는 과도회복전압파고치(U0)와 초기상승률(RRRV)를 검토하여야 하며, 국제적으로 IEC 62271-100 기준에 따른다. 본문에서는 전압 22.9[㎸], 수전용량 6[MVA]의 설비를 기준으로 Cable의 길이변화, 변압기의 Bank 구성방식, 계통 구성방식을 달리하여 과도회복전압(TRV)의 발생 유형 및 특성을 검토하였으며, IEC 62271-100기준과 비교 검토하였다.
EMTP-RV를 이용한 대용량 전기설비의 차단기 TRV에 관한 연구
조계술(Kyeh-Sool Cho),최홍규(Hong-Kyoo Choi) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.10
In electric power system, the circuit breaker is not operated when the higher voltage then the rated TRV(transient Recovery Voltage) appeared in the circuit breaking, The TRV of a circuit breaker means the characteristics of reignition by the arc between two poles. and is decided by the value of connecting Impedance. In this paper we of carried out many kinds of experiments varying the types of bus, the types of installation, the length of installation between 22.9 [kV] level circuit breaker and MTR in general 154/22.9[kV] system, We also simulated the characteristics of TRV using EMTP-RV program. The suitability of TRV in assessed by Uc, RRRV(Rate of Rise of Recovery Voltage) which are defined by the international guide, IEC62271-100. The values of RRRV gained from the cable-made bus are 590[%] lesser than those from the NSPB-made bus respectively. So the triangled type is more rational in the aspect of TRV.
온도특성을 고려한 저압간선의 경제적인 설계기법에 관한 연구
최홍규(Hong-Kyoo Choi),조계술(Kyeh-Sool Cho) 한국조명·전기설비학회 2002 한국조명·전기설비학회 학술대회논문집 Vol.2002 No.-
A size of low-voltage conductor cables is determined by the voltage drop of a system, the cable impedance and the cable ampacity based on temperature correction factor in accordance with the condition of cable installation. Therefore, the proper temperature correction factor according to the condition of cable installation should be applied to determining the cable ampacity and also the skin effect and proximity effect, along with the kind and size of conductor and the condition of cable installation, should be properly considered to analyze the proper value of resistance and the reactance of the conductors. This paper addresses the systematic design flow for determining the size of low voltage level conductor cables in calculating the temperature character where error should be minimized in comparison with the general formula and which can be applied in design work for determining the size of conductor cables.
최홍규(Hong-Kyoo Choi),원진희(Jin-Hee Won),송영주(Young-Joo Song),조계술(Kyeh-Sool Cho) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
Airport facility is infrastructure that become external creditworthiness and linear measure of country competitive power. Among them, receive and supply of electric power facility of airport is very important in peculiarity, trustability, safety side of airport. In this paper, sorted domestic airline as 4 classes by code to accomplish standardization for receive and supply of electric power facility of airport. And established justice and coverage about receive and supply of electric power facility using without any standard present and analyze problem for receive and supply of electric power facility of existing airport and presents standard. Finally, present standard single-line diagram by airport grade and system grade standard of receive and supply of electric power facility of airport.
전위강하법을 이용한 접지저항 측정시 오차보상기법의 적용에 관한 연구
하춘섭(Chun-Sup Ha),최홍규(Hong-Kyoo Choi),박준열(Joon-Yeol Park),송영주(Young-Joo Song),조계술(Kyeh-Sool Cho),이정은(Jung-Eun Lee) 한국조명.전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
일반적으로 접지저항 측정 시 사용하는 전위강하법은 접지전극과 전류보조전극의 저항구역이 중첩되지 않도록 멀리 이격한 상태에서 61.8[%]지점에 전위보조전극을 위치시켜 측정하여야 한다. 하지만 보조전극의 위치에 장애물이 있는 경우 보조전극의 위치변화에 따라 오차가 발생하고, 측정에 어려움이 발생한다. 따라서 본 논문에서는 반구형 접지전극 수치모델로 제안된 오차보상기법을 Mesh접지전극에 적용하여 실증실험을 통해 접지저항 값을 비교·분석하였다.
崔洪圭,趙啓術,徐梵寬 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-
A size of low-voltage conductor cables is determined by the voltage drop of a system, the cable impedance and the cable ampacity based on temperature correction factor in accordance with the condition of cable installation. Therefore, the proper temperature correction factor according to the condition of cable installation should be applied to determining the cable ampacity and also the skin effect and proximity effect, along with the kind and size of conductor and the condition of cable installation, should be properly considered to analyze the proper value of resistance and the reactance of the conductors. This paper addresses the systematic design flow for determining the size of low voltage level conductor cables in calculating the voltage drop of a power system and proposes a new improved the calculating formula where error should be minimized in comparison with the general formula and which can be applied in design work for determining the size of conductor cables.