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이기홍(Kihong Lee) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
This paper gives the results of survey of lightning damages in apartments which are obtained by questionnaire and the cases of lightning damages of home automation systems in apartments. Survey result shows that lightning damages are increasing every year. Also the surge durability tests of home automation system were performed. It was reveled that two of the five specimens had failed to pass the durability test for the surge voltage.
공동주택에서의 서지보호장치(SPD) 시공 실태 및 개선방안
이기홍(Kihong Lee),엄철환(Cheolhwan Eom) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
SPD(Surge Protective Device) is very important in LPS(Lightning Protection System) to protect vulnerable electrical and electronics devices from surges caused by lightning strokes or switching. Also SPD should be installed with shot lead line to protect electronic installations. But this paper finds the fact that almost SPDs have been installed with lead line exceeding 0.5m in apartments. This paper suggests the improvement of SPD installation method with equipotential bonding bar to eliminate voltage caused by lead line impedance. Suggested method was certified by experiment with excellent performance.
공동주택 금속기와지붕 수뢰시스템의 자재 및 시공기법 개발
이기홍(Kihong Lee) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.10
Apartments covered with a metal roof made from galvalume steel are prevailing due to their economic and technical advantages. The metal roof, however, has disadvantages in terms of the installation of air-termination system on it because of the slip thickness of the metal roof. In this paper, the impacts of the lightning current to a metal roof were verified experimentally with a short lightning impulse current (10/350[㎲]). Also, we developed various supporters of air-termination conductor for the metal roof and verified their excellent workability and economical strength through field application test.
수선이력을 통한 임대아파트 수변전실의 역률보상용 커패시터 수명 및 수선교체주기의 통계적 검증
이기홍(Kihong Lee) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.10
It is generally recognized that the life of a capacitor can be affected by its operating temperature, terminal voltage or current. By the various reasons, many capacitors are failed in operating to a designed life expectancy. This paper studied the service life and the replacement cycle of power factor correction capacitors installed in apartment power service center using the maintenance record. From the results, it was confirmed that most power factor correction capacitors have service life and replacement cycle between 10 years and 20 years.
아파트 주동 분전반 노후 배선용차단기(MCCB)의 성능평가 실험
이기홍(Kihong Lee) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.11
MCCB is one of the most important electrical equipments for high reliable power supply system in apartment. Malfunctions of old MCCB(Mold Case Circuit Breaker) installed in apartment distribution panel may cause serious accidents, nevertheless, the performance evaluation effort of the old MCCB was very rare until now. This paper examined the performance of MCCBs used for more than 20 years by experiments. As a result, 14% of the MCCB specimens failed to pass the over-current trip tests and 11% of the MCCB specimens had occurred excessive temperature rise. In particular, it was confirmed that 50% of the MCCB specimens were broken in switching withstand test. The results obtained from the tests meant that the aging condition of MCCB used in apartments for more than 20years gets serious.
IEC 규격에 의한 공동주택 피뢰 및 접지시스템의 설계 · 시공 사례
이기홍(Kihong Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
This paper presents a case of design & election of lightning protection system(LPS) and earthing system in apartments. In addition, it also includes the result of several experimental verifications on the use of natural components of structures as part of a LPS such as metallic tiles, reinforcing steel in the buildings foundations and steelwork within reinforced concrete. The probability of a puncture on metallic tiles due to the charge of high impulse current(100㎄ 10/350㎲) has been evaluated in order to confirm the risk of a puncture. There was no any puncture on the metallic tiles at a high current of 100㎄,10/350㎲. The installation of the reinforcement bars as LPS conductors, however, must be very carefully implemented since it was proved that a poor tie between two reinforcement bars can easily cause serious cracking of the concrete even at a current of 50㎄, 10/350㎲.