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ANSI/IEEE IEC 規格에 따른 變壓器의 短絡强度試驗의 比較
김선구(Sun-Koo Kim),김선호(Sun-Ho Kim),김원만(Won-Man Kim),나대열(Kim Dae-Ryeol),노창일(Chang-Il Roh),이동준(Dong-Jun Lee),정흥수(Heung-Soo Jung) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Generally Short Circuit Test of transformers are tested according to IEEE std C57.12.00-2000, IEC 60076-5(2000-07), ES148(1998.6.26) or KS C4309(2003). But ES148 (1998.6.26) is same as IEEE std C57. 12.00-2000 and KS C4309(2003) is revising coincidence with IEC 60076-5 (2000 ~07). On this study condition of the transformers before short circuit test, calculation method for test current peak value, tolerance on the asymmetrical peak and r.m.s value, short circuit testing procedure, number of short circuit test, duration short circuit test, and detection of faults and evaluation of short circuit test result will be compared with ANSI and IEC.
김선구(Kim Sun-Koo) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
There are many equipments as short circuit generator, induction motor, sequence timer, exciter, back up breaker and making switch for the short circuit test. Especially back up breaker and making switch are very important equipments of these. A role of a back up breaker is to break high-voltage and high-current for short circuit test and a making switch is to make the test current. The making switch should be operated always same speed/time and should be kept electrical-mechanical characteristics. Recently purchasers request to be tested the short circuit test by IECEE which should be adjusted within ±0.23㎳ of making angle. Now the hydraulic making switch is a unique switch for satisfaction of the above condition. This study introduces weighty parts, structure and principle of hydraulic making switch.
ANSI/IEEE와 IEC 표준에 따른 변압기의 단락강도시험방법 비교고찰
김선호(Sun-Ho Kim),김선구(Sun-Koo Kim),김원만(Won-Man Kim),나대열(Dae-Ryeol La),박영기(Young-Ki Park),이동준(Dong-Jun Lee),정흥수(Heung-Soo Jung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
Generally Short Circuit Test of transformers are peformed according to IEEE std C57.12.00:2006, IEC 60076-5:2006, KS C 4309:2003 and ES by KEPCO etc. Among these various standards IEC and IEEE standards are the basis of other standards as ES refers to IEEE std C57. 12.00 and KS C4309 is modification of IEC 60076-5. Therefore this study tries to compare these two main standards on the short circuit test conditions of the transformers before short circuit test, calculation method for test current peak value, tolerance on the asymmetrical peak and r.m.s value, short circuit testing procedure, number of short circuit test, duration short circuit test, and detection of faults and evaluation of short circuit test result.
최적화(最適化) 기법(技法)에 의한 저유함수(貯留函數) 유출(流出) 모형(模型)의 자동보정(自動補正)
심순보,김선구,고석구,Shim, Soon Bo,Kim, Sun Koo,Ko, Seok Ku 대한토목학회 1992 대한토목학회논문집 Vol.12 No.3
다목적댐 유역에서의 호우(濠雨)발생지 저수지 실시간(實時間) 운영을 위해서는 Telemeter 설비를 통해 온라인으로 전송된 강우(降雨) 및 유입량(流入量)(수위(水位)) 관측자료를 이용하여 강우(降雨)-유출(流出) 모형(模型)의 매개변수(媒介變數) 신속하게 보정(補正)하고 정확한 유입량을 예측하여야 한다. 지금까지는 유출모형의 매개변수 보정을 모형 운영자의 주관적인 판단 아래 시행착오(試行錯誤)에 의한 수동보정(手動補正) 방법을 사용하여 왔으나 최적화 기법을 이용하여 강우-유출모형의 매개변수를 자동으로 보정할 수 있는 방법을 제시하는 것이 본 연구의 목적이다. 최적화 기법으로는 다양한 조건하에서도 해의 안정성이 우수한 Pattern-Search법을 선정하였으며 목적함수로는 모형에 의해 산정된 유출량과 관측 유출량과의 편차의 제곱에 대한 누계치를 최소화 하는 것으로 하였다. 본 연구를 위하여 개발한 최적화 기법을 현재 한국수자원공사(韓國水資源公社)에서 소양강 다목적댐의 실시간 홍수조절에 사용하고 있는 저유함수(貯留函數) 유출모형의 매개변수를 과거의 홍수사상(洪水事象) 사용하여 자동으로 보정 하는데 적용하였다. 적용결과에 시행착오에 의한 수동보정 방법보다 시간 및 노력면에서 보다 효율적일 뿐아니라 홍수예측 기능도 보다 우수하여 저수지의 실시간 홍수예측 및 홍수조절에 알맞은 것으로 나타났다. For the real-time control of a multi-purpose reservoir in case of a storm, it is absolutely necessary to forecast accurate flood inflows through a good rainfall-runoff model by calibrating the parameters with the on-line rainfall and water level data transmitted by the telemetering systems. To calibrate the parameters of a runoff model. the trial and error method of manual calibration has been adopted from the subjective view point of a model user. The object of this study is to develop a automatic calibration method using an optimization technique. The pattern-search algorithm was applied as an optimization technique because of the stability of the solution under various conditions. The object function was selected as the sum of the squares of differences between observed and fitted ordinates of the hydrograph. Two historical flood events were applied to verify the developed technique for the automatic calibration of the parameters of the storage-function rainfall-runoff model which has been used for the flood control of the Soyanggang multi-purpose reservoir by the Korea Water Resources Corporation. The developed method was verified to be much more suitable than the manual method in flood forecasting and real-time reservoir controlling because it saves calibration time and efforts in addition to the better flood forecasting capability.