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직류전원을 이용한 배전급 차단기의 등가 3상 합성투입시험법
박병락(Byung-Rak Park),조만영(Man-Yong Jo),김진석(Jin-Seok Kim),신희상(Hee-Sang Shin),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.7
The study about three-phase synthetic making test using DC power has been performed in order to increase the making test capacity on Vacuum Circuit Breaker. And, it made possible to solve the limitations that short-circuit testing facilities can not fulfill the testing requirements of VCB exceeding three-phase 36[㎸] 31.5[㎄]. By using DC power and high speed spark-gap switch, this method made the equivalence with the pre-arc that occurred during the making process under the fault condition of power system. As results, KERI(Korea Electrotechnology Research Institute) could have capacity to carry out type test for VCB under three-phase 52[㎸] 40[㎸], which satisfies the IEC Standard.
배전용 S2급 차단기의 차단 성능평가 시험법에 관한 연구
박병락(Byung-Rak Park),조만영(Man-Yong Jo),김진석(Jin-Seok Kim),신희상(Hee-Sang Shin),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.8
Technical requirements for medium voltage class circuit breaker were harmonized by IEC and IEEE, and IEC newly adopted the requirements for class S2 circuit-breaker for overhead-line with the ratings of high-frequency TRV(Transient Recovery Voltage), which IEEE already adopted. Under these circumstances, KERI(Korea Electrotechnology Research Institute) studied testing technologies and facilities, which enable to perform interrupting capacity tests for class S2 circuit-breaker. As results, KERI could carry out interrupting capacity tests for medium voltage class circuit breaker rated up to 3-phase 52[㎸] 40[㎄], which satisfies the IEC standard.
화학 플랜트에서의 비상발전기 용량선정 방안(PG3)에 관한 연구
이승재(Seung-Jae Lee),조만영(Man-Young Jo),김세용(Se-Yong Kim),김은태(Eun-Tae Kim),강병욱(Byoung-Wook Kang),박한민(Han-Min Park),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.12
PG and RG methods are widely known method for calculating the capacity of the emergency generator in construction electrical installation. PG and RG methods are mainly used as a saving a life, fire protection, fire fighting in construction. Because no long distance between the emergency generator and electric motor feeder, the relatively small motor power in construction electrical installation, the capacity of generator in PG and RG methods are little problem of voltage and reactive power of generator. However in many cases the application of the PG and RG method is difficult in the Chemical Plant because it is long distance between the generator and the motor Feeder and motor capacity is very large. Motor starting power factor is about 0.2 lagging power factor and motor starting current is about 6times during motor staring. Also Most of the staring current component is a reactive power component. therefore, it is many cases that lack of reactive power and excess of allowable voltage drop limit and After selection of emergency diesel generator, problems happen during motor starting. Therefore, to be selection of effective emergency generator, active generator power, reactive power and the required reactive power during large motor starting should be considered in chemical plant. It is also required of the verification process through simulation because hand calculation is very difficult considering study cases.