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강용철,Gang, Yong-Cheol 대한전기협회 2010 전기저널 Vol.399 No.-
부존자원이 부족한 우리나라는 1970년대 2차례 석유파동을 겪으면서 기술 집약적인 에너지원으로서 원자력발전의 중요성을 인식하고 지속적으로 원전건설 및 기술자립을 추진하여왔다. 1978년 7월 고리 1호기 준공에 따라 세계에서 21번째로 원전 보유국이 되었으며, 이후 30여 년간 끊임없는 원전기술개발을 추진하여온 결과, 지난해 말 아랍에미리트(UAE)에 APR1400 원전 수출이라는 쾌거를 이룰 수 있었다. 이에 그동안 우리나라 원자력 산업 발전 경과를 살펴보고 앞으로의 기술개발 방향을 조망하고자 한다.
강용철,김은숙 대한전기학회 2006 전기학회논문지A Vol.55 No.3
- This paper proposes a modified current differential relay for Y- transformer protection. The relay uses the same restraining current as a conventional relay, but the differential current is modified to compensate for the effects of the exciting current. A method to estimate the circulating component of the delta winding current is proposed. To cope with the remanent flux, before saturation, the core-loss current is calculated and used to modify the measured differential current. When the core then enters saturation, the initial value of the flux is obtained by inserting the modified differential current at the start of saturation into the magnetization cure. Thereafter, the core flux is then derived and used in conjunction with the magnetization curve to calculate the magnetizing current. A modified differential current is then derived that compensates for the core-loss and magnetizing currents. The performance of the proposed differential relay was compared against a conventional differential relay. Test results indicate that the modified relay remained stable during severe magnetic inrush and over-excitation, because the exciting current was successfully compensated. This paper concludes by implementing the relay on a hardware platform based on a digital signal processor. The relay does not require additional restraining signal and thus cause time delay of the relay.