• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권2호
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• pp.62-67
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• 2002

This paper provides the results of accelerated aging test of 18kV ZnO lightning arresters to investigate the leakage current characteristics. It was impossible to establish the replacement criterion for field operating lightning arrester because conventional aging test was only focused on the aging of ZnO elements. In general, it is possible to replace the aged arresters before the failure in the field using the leakage current measurement because it must be increased by the aging. But we can not use the method because we don't know the characteristics of the installed lightning arresters. Therefore in this paper we applied operating voltage and accelerating cycle which consists of temperature and humidity to the arresters. Then we measured the variation of total and resistive leakage current and found out the characteristics of the acted lightning arresters.

• KIEE International Transactions on Power Engineering
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• 제5A권2호
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• pp.171-176
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• 2005

The effects of surge arresters for the protection of transmission systems against direct lightning strokes have already been reviewed by many researchers. However, their studies have not encompassed underground cable systems. Therefore, in this paper we investigate the 22.9kV combined distribution systems that have arresters and ground wires. In addition, we analyze the overvoltages on underground distribution cable sections when direct lightning strokes contact the overhead ground wire using EMTP. Finally, we discuss the effect of lightning strokes according to the change of cable length and installation of arresters. This study provides insulation coordination methods for reasonable system design in 22.9kV underground distribution cable systems.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권6호
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• pp.253-259
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• 2002

This paper deals with the effects of grounding conductors for metal oxide surge arresters. When surge arresters are improperly installed, the results can cause costly damage of electrical equipments. In particular, the route of surge arrester connection is very important because bends and links of leads increase the impedances to lightning surges and tend to nullify the effectiveness of a grounding conductor. Therefore, there is a need to know how effective installation of lightning surge arresters is made in order to control voltage and to absorb energy at high lightning currents. The effectiveness of a grounding conductor and 18 [㎸] metal oxide distribution line arresters was experimentally investigated under the lightning and oscillatory impulse voltages. Thus, the results are as follows; (1) The induced voltage of a grounding conductor is drastically not affected by length of a connecting line, but it is very sensitive to types of grounding conductor. (2) The coaxial cable having a low characteristic impedance is suitable as a grounding conductor. (3) It is also clear from these results that bonding the metal raceway enclosing the grounding conductor to the grounding electrode is very effective because of skin effect. (4) The induced voltages of grounding conductors for the oscillatory impulse voltages are approximately twice as large as those for the lightning impulse voltages.

• 대한전기학회논문지:전력기술부문A
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• 제53권4호
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• pp.238-247
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• 2004

This paper describes the insulation coordination scheme of line in distribution system when the direct lightning surge strikes. The BIL that is applied to distribution system is not properly considered the performance and operation of arresters. Because of that, the high BIL is being used at partial system. This paper variously analyses the lightning overvoltage of line and equipment with earth of overhead grounding wire and installation types of arrester. From these result. authors examine the rationality of BIL.

• 조명전기설비학회논문지
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• 제23권4호
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• pp.79-85
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• 2009

이 논문은 피임펄스전류의 입사에 따른 ZnO 피뢰기의 열화 특성에 대하여 기술하였다. 뇌서지에 의한 ZnO 피뢰기의 열화특성을 분석하기 위해 시료 ZnO 피뢰기에 8/20[${\mu}s$], 2.5[kA]의 표준뇌임펄스전류를 인가하였다. 뇌임펄스전류를 인가한 것과 인가하지 않은 ZnO 피뢰기에 흐르는 상용주파수 AC 및 DC 누설전류를 측정하였다. 그 결과 임펄스전류의 인가횟수가 증가함에 따라 누설전류는 증가하였고 AC전압에서 누설전류의 비 대칭성은 뚜렷하게 나타났다. 뇌임펄스전류를 인가하지 않은 ZnO 피뢰기의 ZnO 입자는 균일한데 반해 뇌임펄스전류를 인가한 ZnO 피뢰기의 ZnO 입자는 불균일하게 변형되었다. 또한 뇌임펄스전류 인가에 따른 $Bi_2O_3$의 감소가 입계층의 결핍을 발생시키며 입계층의 결핍에 의한 전류의 집중이 ZnO 피뢰기 소자의 비선형 특성의 열화에 대한 중요한 요인으로 작용한 것으로 밝혀졌다.

• 대한전기학회논문지:전력기술부문A
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• 제53권2호
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• pp.104-110
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• 2004

This paper describes the lightning overvoltage occurred differently according to installation methods of arresters and overhead grounding wire in case of double circuits distribution systems. First, the analysis models are established considering the severe case between upper and lower distribution line, when the direct lightning surge strikes to the overhead grounding wire. The lightning overvoltage is variously analyzed with the change of grounding interval and resistance, arrester installation interval as well as the magnitude of surge using EMTP. After simulation results are compared with the BIL which is now used at field, the authors propose the methods for suitable shielding in domestic distribution systems.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1718-1720
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• 2001

The route of surge arrester connection is very important because bends and kinds of leads increase the impedance to lightning surges and tend to nullify the effectiveness of a grounding electrode conductor. There is a need to know how effective installation of lightning surge arresters is made in order to control voltage and to absorb energy at high lightning currents. The effectiveness of a grounding conductor and bonding for 18[kV] metal oxide distribution line arresters was experimentally investigated with lightning and oscillating impulse voltages.

• 대한전기학회논문지:전력기술부문A
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• 제55권10호
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• pp.433-439
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• 2006

This paper describes the characteristic evaluation of 154kV lightning arrester developed by domestic technology. To prove the protective ability of lightning arrester developed, various overvoltages were analyzed for A and B arrester were being used now at 154kV air and gas insulation substation, and for arrester developed. The results obtained by the various simulations show that the developed arrester has the effective protective ability and reducing ability of the overvoltage as A and B arrester, nevertheless there are somewhat differences among three kinds of arresters. Accordingly, it is evaluated that the arrester developed by domestic technology secured reliability can be installed actually at 154kV substation. In this paper, EMTP/ATP was used for simulation.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.596-598
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• 2000

This paper presents a new accelerating aging test facility for distribution lightning arresters. Aging parameters of lightning arrester are moisture ingress, electrical stress and surge absorption and so on. In this system, we applied 13.2kV to 6 samples and controled temperature and humidity of chamber and measured leakage currents of the all samples. Also we developed accelerating aging cycle which consists of -35$^{\circ}C$∼90$^{\circ}C$ temperature and 40%∼90% humidity. Through the aging test we found out the leakage current of aged sample increases rapidly according to the temperature rising. Hereafter we can determine the replacement guide of leakage current for field operating arresters and condition assessment of aged samples through this aging test.

• 조명전기설비학회논문지
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• 제15권2호
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• pp.13-20
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• 2001

본 논문은 배전선에 설치하는 내뢰설비인 가공지선과 피뢰기의 특성과 생략 방안에 대하여 언급하였다. 특히, 피뢰기의 중간 상을 생략하는 방안에 대하여 EMTP 시뮬레이션을 실시하여 생략시 나타날 수 있는 문제점과 생략 방안에 대해 기술하였으며, 가공지선은 지정된 경우에는 생략이 가능하고 피뢰기는 중간 상을 생략시 건전상의 피뢰기 용량을 재검토해야 할 것으로 생각된다.