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- 저자 : 이종훤(Jong-Hweon Lee) (검색결과 7 건)
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스팀터빈 발전기 비동기 투입 사례연구를 통한 비동기 방지 알고리즘 개발
이종훤(Jong-Hweon LEE) 대한전기학회 2012 전기학회논문지 Vol.61 No.10
Asynchronous phenomenon occurs on the synchronous generators under power system when a generator"s amplitude of electromagnetic force, phase angle, frequency and waveform etc become different from those of other synchronous generators which can follow instantly varying speed of turbine. Because the amplitude of electromagnetic force, phase frequency and waveform differ from those of other generators with which are to be put into parallel operation due to the change of excitation condition for load sharing and the sharing load change, if reactive current in the internal circuit circulates among generators, the efficiency varies and the stator winding of generators are overheated by resistance loss. When calculation method of protection settings and logic for protection of generator asynchronization will be recommended, a distance relay scheme is commonly used for backup protection. This scheme, called a step distance protection, is comprised of 3 steps for graded zones having different operating time. As for the conventional step distance protection scheme, zone 2 can exceed the ordinary coverage excessively in case of a transformer protection relay especially. In this case, there can be overlapped protection area from a backup protection relay and, therefore, malfunctions can occur when any fault occurs in the overlapped protection area. Distance relays and overcurrent relays are used for backup protection generally, and both relays have normally this problem, the maloperation, caused by a fault in the overlapped protection area. Corresponding to an IEEE standard, this problem can be solved with the modification of the operating time. On the other hand, in Korea, zones are modified to cope with this problem in some specific conditions. These two methods may not be obvious to handle this problem correctly because these methods, modifying the common rules, can cause another coordination problem. To overcome asynchronizing protection, this paper describes an improved backup protection coordination scheme using a new logic that will be suggested.
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임피던스 계전기를 이용한 발전기 비동기 투입 보호 연구
이종훤(LEE Jong-Hweon) 대한전기학회 2011 전기학회논문지 Vol.60 No.11
Asynchronous phenomenon occurs on the synchronous generators under power system when a generator"s amplitude of electromagnetic force, phase angle, frequency and waveform etc become different from those of other synchronous generators which can follow instantly varying speed of turbine. Because the amplitude of electromagnetic force, phase frequency and waveform differ from those of other generators with which are to be put into parallel operation due to the change of excitation condition for load sharing and the sharing load change, if reactive current in the internal circuit circulates among generators, the efficiency varies and the stator winding of generators are overheated by resistance loss. Where calculation method of protection settings and Logic for Protection of Generator Asynchronization will be recommended, A distance relay scheme is commonly used for backup protection. This scheme, called a step distance protection, is comprised of 3 steps for graded zones having different operating time. As for the conventional step distance protection scheme, Zone 2 can exceed the ordinary coverage excessively in case of a transformer protection relay especially. In this case, there can be overlapped protection area from a backup protection relay and, therefore, malfunctions can occur when any fault occurs in the overlapped protection area. Distance relays and overcurrent relays are used for backup protection generally, and both relays have normally this problem, the maloperation, caused by a fault in the overlapped protection area. Corresponding to an IEEE standard, this problem can be solved with the modification of the operating time. On the other hand, in Korea, zones are modified to cope with this problem in some specific conditions. These two methods may not be obvious to handle this problem correctly because these methods, modifying the common rules, can cause another coordination problem. To overcome asynchronizing protection this paper describes an improved backup protection coordination scheme using a new Logic that will be suggested
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이종훤(Jong-Hweon LEE),전명렬(Myeong-Ryeal JEON),최한열(Han-Yeol CHOI) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
전력계통의 비접지 계통에 지락 고장이 발생하면 중성점 이동으로 고장이 발생하지 않은 건전상의 전위가 상승한다는 사실은 누구나 다 알고 있다. 이는 전기적으로 균형을 이루고 있는 계통에 지락 고장으로 상간 불균형이 초래되기 때문인데 보통 비접지 계통의 보호는 1상 지락 시는 고장전류가 거의 없기 때문에 영상 과전압을 이용한 한시 보호계전 방식으로, 2중 접지 시는 과전류 계전방식으로 보호 하고 있다. 그런데 고장전류가 없어 상대적으로 파급이 적을 것 같은 1상 지락고장 시 건전 상에 발생한 과전압이 또 다른 고장을 유발, 더 큰 고장으로 진전되어 많은 복구비용을 발생하게 하거나 예상치 못한 현상을 일으켜 고장원인을 분석하고 처리하는데 어려움을 초래하기도 한다. 본 논문은 발전소 비접지 계통에서 발생하는 중성점이동 현상에 대해서 논하고자 한다.
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이종훤(Jong-Hweon Lee),정우중(Woo-Joong Jung),신성식(Seong-Sik Shin),이형(Hyung Lee),신창균(Chang-Gyun Shin) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper analyzes operation sensitivity of a relay, a blind spot of differential protection relaying, and how to protect the blind spot in protective relying of 3φ Y-Delta transformer consisting of three 1φ transformers which Korean pumped storage power plants have been using. Each different protective relayings must be adopted because there are differences between 3φ trans-former and 3φ transformer consisting of three 1φ trans-formers. Also, in the system using high resistance grounding for fault current restriction of delta side, protection for delta side faults have to be considered properly.
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김경열,김희동,김병래,공태식,김병한,이상길,이종훤,최홍석,Kim, Kyeong-Yeol,Kim, Hee-Dong,Kim, Byeong-Rae,Kong, Tae-Sik,Kim, Byong-Han,Lee, Sang-Kil,Lee, Jong-Hweon,Choi, Hong-Suck 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.10
When the high voltage motor fails in power plants, there will be an occurrence where the generator's output would be reduced or the generators would trip. Despite of these effects, the causes of deterioration of the high voltage motor is very seldom investigated. In this paper, the collected data which tested in the field over 10 years have been treated statistically, and analyzed to correlate the insulation deterioration of high voltage motor and installation environment, number of start/stop, and service life. Moreover, the proper period of insulation test is developed to map out maintenance strategy and reduce maintenance costs.
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