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鄭在甲(Jae Kap Jung),李相和(Sang Hwa Lee),權聖遠(Sung Won Kwon),姜銓洪(Jeon Hong Kang),金明壽(Myung Soo Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.5
A recently developed methods for on-site calibration of the current transformer (CT) comparator system have been reviewed in the paper. The method utilizes several traveling standards, which consist of the CT, non-reactive standard resistors, wide ratio error CT, and shunt resistors. The traveling CT is used for absolute evaluation of a standard CT belonging to industry. The non-reactive standard resistors and a wide ratio error CT are used for the linearity check of errors in the current comparator. The shunt resistors are used for evaluation of CT burden of industry.
전류변성기 비교 측정 장치의 비오차 및 위상각 오차의 직선성 현장 평가기술
鄭在甲(Jae-Kap Jung),權聖遠(Sung-Won Kwon),李相和(Sang-Hwa Lee),姜銓洪(Jeon-Hong Kang),金明壽(Myungsoo Kim) 대한전기학회 2006 전기학회논문지C Vol.55 No.6
A method for evaluation of the linearity of both the ratio error and phase angle error in the current transformer(CT) comparison measurement equipment has been developed by employing the standard resistors with negligible AC-DC resistance difference less than 10??. The non-reactive standard resistors for the linearity check of the system are used as the external burden connected with the secondary of CT under test. These burdens consist of nine standard resistors, with the nominal resistance of 0.01 Ω, 0.1 Ω, 0.2 Ω, 0.4 Ω, 0.6 Ω, 1 Ω, 2 Ω, 4 Ω, and 10 Ω. For linearity check, the developed method has been applied in the CT comparison measurement equipment belonging to the industry.
鄭在甲(Jae-Kap Jung),權聖遠(Sung-Won Kwon),李相和(Sang-Hwa Lee),姜銓洪(Jeon-Hong Kang),金明壽(Myung-Soo Kim),韓相吉(Sang-Gil Han),金潤亨(Yoon-Hyoung Kim),韓相玉(Sang-Ok Han) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2
National standard system for calibrating voltage transformer(VT) up to primary voltage of 240 ㎸ have been established in 2005. The system consists of voltage source, regulating unit, VT testing unit, standard VT, VT under test and VT burden. To verify and validate the performance for 240 ㎸ VT calibration system, the comparison with the National Measurement Institute of Australia(NMIA) has been performed using same VTs. The comparison results of the VTs mesured at the Korea Research Institute of Stansdards and Science(KRISS) are consistent with those measured at NMIA within 0.002 % for ratio error and 0.14 min for phase displacement in the primary voltage ranges of Vp = 3300 V - 22000 V with a secondary voltage of Vs = 110 V.
정재갑(Jae Kap Jung),이상화(Sang Hwa Lee),강전홍(Jeon Hong Kang),이승학(Seung Hak Lee) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
200 ㎸/20 kA 까지의 교류 고전압/대전류 국가표준시스템을 구축하였다. 구축한 교류 고전압 200 ㎸/20 kA 국가표준시스템 장비의 대한 소개 및 장비의 구성, 선진표준기관과의 국제비교결과를 논의한다.
鄭在甲(Jae-Kap Jung),李相和(Sang-Hwa Lee),姜銓洪(Jeon-Hong Kang),金明壽(Myung-Soo Kim),金潤亨(Yoon-Hyoung Kim),韓相吉(Sang-Gil Han),韓相玉(Sang-Ok Han) 대한전기학회 2008 전기학회논문지 P Vol.57 No.1
National standard system for calibrating current transformer(CT) up to primary current of 20,000 A have been established. The system consists of 20,000 A AC high current source, CT comparator, standard CT, CT under test and CT burden. An AC high current is applied to the primary windings of both the standard CT and the CT under test, and then the CT comparator measures the ratio error and the phase displacement by comparing the secondary currents of the two transformers. As a validity check for 20,000 A CT calibration system, the comparison with the two national standard institutes(NMIs) has been performed using same CTs. The comparison results of the CTs are consistent with those measured at two NMIs within 0.004 % for ratio error and 0.1 min for phase displacement in the primary current ranges of Ip = 10 - 20,000 A with a secondary current of Is = 5 A.
66㎸급 전압변성기 비교측정 장치의 현장 평가설비 구축
鄭在甲(Jae Kap Jung),李相和(Sang Hwa Lee),權聖遠(Sung Won Kwon),金明壽(Myungsoo Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.7
A recently developed methods for the on-site calibration of the voltage transformer (VT) comparator system have been reviewed in the paper. The method utilizes the several traveling standards consisting of the VT, the non-reactive standard resistors, the wide ratio error VT, and the decade resistors. The VT is used for the absolute evaluation of a standard VT belonging to the industry. The non-reactive standard resistor and wide ratio error VT are used for the linearity check of errors in the voltage comparator of the industry. The decade resistors are used for evaluation of a VT burden of the industry.
200 ㎸ 용량형 분압기 2대를 이용한 교류 고전압 측정범위 확장
鄭在甲(Jae-Kap Jung),李相和(Sang-Hwa Lee),姜銓洪(Jeon-Hong Kang),金明壽(Myung-Soo Kim),金潤亨(Yoon-Hyoung Kim),韓相吉(Sang-Gil Han),鄭辰慧(Jin-Hye Jeong),韓相玉(Sang-Ok Han),鄭鍾萬(Jong-Man Joung) 대한전기학회 2008 전기학회논문지 P Vol.57 No.1
The output voltage value of AC high voltage source has been usually obtained by multiplying low voltage value measured at both terminals of low voltage resistor by the dividing ratio of the high voltage capacitive divider. From the dividing ratio determined of each 200 ㎸ capacitive divider, we have developed step-up method for measuring the output voltage up to 400 ㎸ using two same type of 200 ㎸ capacitive dividers connected in series. The theoretical dividing ratio of 400 ㎸ capacitive dividers connected in series coincides with that of manufacturer's certification within measurement uncertainty. Thus, this developed step-up method makes it possible to extend the range of output voltage from 200 ㎸ to 400 ㎸, Furthermore. The dividing ratio of divider under test obtained using this step-up method is consistent with that obtained using one 200 ㎸ high voltage divider within corresponding uncertainties.
전류변성기 비교기와 정밀션트저항을 이용한 전류변성기용 부담의 평가기술
鄭在甲(Jae Kap Jung),李相和(Sang Hwa Lee),姜銓洪(Jeon Hong Kang),金明壽(Myungsoo Kim),權聖遠(권성원) 대한전기학회 2006 전기학회논문지C Vol.55 No.5
Both ratio error and phase angle error in current transformer(CT) depend critically on values of CT burden. Thus, precise measurement of CT burden is very important for the evaluation of CT. A method for the measurement of CT burden has been developed by employing the portable shunt precise resistor with negligible AC-DC resistance difference less than 10<SUP>-5</SUP>. The burden valuetvalue and power factor) can be calculated from resistance and reactance obtained by measuring the change of ratio error and phase angle error caused by the change of shunt resistor. The uncertainty for the method is evaluated and found to be about 2 %.