http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
金鉉洙(Hyun-Soo Kim),李相奉(Sang-Bong Rhee),呂相敏(Sang-Min Yeo),金喆煥(Chul-Hwan Kim),柳承憲(Seong-Heon Lyu),金聖巖(Seong-Arm Kim),元鳳周(Bong-Ju Weon) 대한전기학회 2008 전기학회논문지 Vol.57 No.10
Recently, it is common in a distribution system of Korea Electric Power Corporation (KEPCO) to find instances where distribution lines are parallel. A traditional method of an induced voltage calculation is not suitable for parallel distribution lines. For more actual analysis of induced voltage on telecommunication lines in parallel distribution lines, a new calculation method is needed. This paper presents a new calculation method of an induced voltage on telecommunication line using equivalent n circuits matrix in parallel distribution lines. The advantages of the calculation method are using actual neutral current value and not using screening factor for considering the overhead ground wire and the neutral wire. To verify the effectiveness and the accuracy of the method, various case studies are performed with EMTP(Electro-Magnetic Transients Program).
김인수(In-Soo Kim),한웅(Woong Han),여상민(Sang-Min Yeo),김철환(Chul-Hwan Kim),원봉주(Bong-Ju Weon),임용훈(Yong-Hun Lim) 대한전기학회 2009 전기학회논문지 Vol.58 No.3
As the telecommunication lines bring into widespread use, one of the most important aspects related to power distribution systems is effectively to evaluate the effect on the telecommunication lines from power lines. One of the efficient methods to evaluate the effect is to measure the induced voltage of a telecommunication line as a result of a ground-loop. If the power lines cause high induced voltage, the ground reference in the telecommunication lines is no longer a stable potential, so signals may ride on the noise. A ground loop is common wiring conditions where a ground current may take more than one path to return to the grounding electrode at the arrangement between the power lines and telecommunication lines. When a multi-path connection between the power lines and telecommunication line circuits exists, the resulting arrangement is known as a ground loop. Whenever a ground loop exists, there are potential for damages or abnormal operations of the telecommunication lines. The power lines can induce the voltage on the communication line. The effects can be calculated by considering the inductances and capacitances. However, if we assume that there are only power lines, it doesn’t have a practical meaning because there are conductors with other purpose in the neighborhood of the lines. If we consider that case, we need more complex system. Therefore we suggest more complex system considering the conductors with other purpose in the neighborhood of the lines. The neutral wires and the overhead ground wires are considered for calculating the induced voltage. We assume that there are the messenger wires beside the power line as a result of increased use of them. The main purpose of this paper is a study on a shielding effect of messenger wires in the distribution lines. EMTP(Electro-Magnetic Transients Program) program is used for the induced voltage calculation.
백승도(Seung-Do Baik),최종혁(Jong-Hyuck Choi),김태영(Tai-Young Kim),민병욱(Byeong-Wook Min),위화복(Hwa-Bok Wi),원봉주(Bong-Ju Weon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
최근 대기환경 악화로 송전용 철탑 도장의 열화가 촉진되어 내후성이 강한 신도료를 송전철탑에 적용이 필요하게 되었다. 도료 제조업체의 신도료로 도장시편을 제작하여 옥외에 폭로후 전문기관에서 성능을 확인하였으며, 이를 토대로 도료의 재질을 실리콘 아크릴우레탄계로 변경하였으며, 철탑용 도료 성능시험 기준을 강화하여 철탑 재도장에 따른 유지보수 비용 절감이 될 수 있도록 개선하였다.