• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1891-1892
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• 2008

본 논문에서는 부분방전 패턴인식을 위한 퍼지뉴럴네크워크(Fuzzy-Nueral Network를 설계한다. 퍼지뉴럴네트워크의 구조에서 규칙의 전반부는 개별적인 입력 공간을 분할하여 표현하고, 규칙의 후반부는 다항식으로서 표현되며 오류역전파 알고리즘을 이용하여 연결가중치인 후반부 다항식의 계수를 학습한다. 또한, 유전자 알고리즘을 이용하여 각 입력에 대한 전반부 멤버쉽함수의 정점과 학습률 및 모멤텀 계수를 최적으로 동조한다. 제안된 네트워크는 부분방전 패턴인식을 위해 다중 출력을 가지며, 초고압 XLPE 케이블 절연접속함의 모의결함에 대해 부분방전 신호를 패턴인식한다. 부분방전 신호는 PRPDA 방법을 통해 256개의 입력 벡터와 4개의 출력 벡터를 가지며, 보이드 방전, 코로나 방전, 표면 방전, 노이즈의 4개 클래스를 분류하며, 패턴인식률로서 결과를 분석한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.365-366
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• 2015

This paper describes the analysis on thermo-mechanical characteristics of underground cable termination. Specially, the interface pressures between stress relief cone and XLPE insulation were analysed according to the change of conductor temperature and ambient temperature. This interface pressures were measured by real test with current transformer and chamber and the interface pressure was changed with conductor and ambient temperature. This paper will continue to perform the test with various cases, then the relation between low interface pressure and breakdown will prove with test results in the near future.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1473-1474
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• 2015

0.6/1kV CV 전선은 저압 지중선용 또는 가공저압배전선로 및 복잡한 인입선 정비를 위한 가공인입 간선용으로 사용한다. CV 전선은 내열성이 높고 내약품성 및 내유성이 우수하며 시공에 따른 미관성이 우수하여 가공인입용으로 적용이 증가하는 추세이다.[10] 가공인입용 CV 전선내 전압선과 중성선 단면적은 동일하게 제작, 현장에 적용되고 있다. 본 논문에서는 3상4선식 0.6/1kV CV 전선을 가공인입선에 적용시 중성선의 단면적을 전압선 단면적보다 평균 47%를 축소 개발, 현장에 적용하여 최적으로 중성선을 운영하는 방안을 제시하였다.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.175-179
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• 1998

The insulation of cable which used for Ultra-High Voltage(UHV) underground power transmission requires excellent insulation capability for high voltage. The typical insulation materials are used XLPE, EPR, etc, but insulation efficiency of these is affected by void or alien substances, existed at the inside of insulators. In this paper, the partial discharge patterns of the defects within insulation cable are observed and analyzed. In this test, void, fiber and metal inclusions which possibly exist in cables, are simulated and investigated the patterns of partial discharges for each models Also the relations between calculated field strength and the insulation breakdown voltage. The experiment shows distinct partial discharge patterns in accordance with the kinds of defects within Insulation cable.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.05c
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• pp.148-151
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• 2002

In order to prevent the failures of underground distribution power cables we need to measure insulation condition in the field. Until now we used DC high voltage as a power source for the cable diagnosis but it was not proper method to the XLPE insulation cables because DC high voltage can affect sound insulation and can't diagnose exactly insulation degradation. For these reasons we imported isothermal relaxation current measurement system called by KDA-1 from germany but it's reliability did not proved in our URD cables. DC voltage decay measurement system was developed by domestic company but they don't have field experience. In this paper we tried to prove reliability of these two systems in the field. Through the field diagnosis and Ac breakdown test the two systems showed similar results.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11b
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• pp.601-604
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• 2001

The insulation materials of cables used for underground power transmission requires a higher insulating capability. and the most popular method to examine the cable is partial discharge test due to applying variation voltage. In the thesis. air void. silicone oil. of which may possibly exist real cables. are simulated by Electra 2D program. Also the relations between calculated field strength and the void defect type in the cable joint materails. In the modeling. electic field inner to the cable joint material composed by XLPE and EPDM is modeling simulated. We obtained the electric field distribution in void due to two conditions.

• Proceedings of the KIEE Conference
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• 1999.11d
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• pp.1057-1059
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• 1999

Recently, increased demand of electrical energy caused additional installation of underground power cable, Industrialization of metro makes civil works difficult. So installed ducts became a key of underground power transmission, LG cable set to work development of high stress cable. LG cable stated in 1996, got a certificate of type test in 1998, and applied at domestic site in Nov. 1999. High stress cable has some merit, decrease of civil cost, reduction of work time, by reason of decrease of dia. and weight, and economical system design, so LG cable has a good merit in comparison with competitive company in domestic and foreign market.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2008.04a
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• pp.411-414
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• 2008

본 논문에서는 다중 출력을 가지는 퍼지 집합 기반 퍼지뉴럴네크워크(Fuzzy-Nueral Network; FNN)를 설계한다. 퍼지 집한 기반 퍼지뉴럴네트워크는 각 입력 변수에 따른 개별적인 입력 공간을 공간 분할함으로서 네트워크를 구성한다. 규칙의 전반부는 앞서 언급한 개별적인 입력 공간을 분할하여 표현하고, 규칙의 후반부는 다항식으로서 표현되며 오류역전파 알고리즘을 이용하여 연결가중치인 후반부 다항식의 계수를 학습한다. 또한, 각 입력에 대한 전반부 멤버쉽 함수의 정점과 학습률 및 모멤텀 계수를 유전자 알고리즘을 이용하여 최적 동조한다. 따라서 유전자 알고리즘을 이용하여 퍼지뉴럴네트워크를 최적 설계한다. 제안된 네트워크는 초고압 XLPE 케이블 절연접속함의 모의결함에 대해 부분방전 신호를 패턴인식한다. 부분방전 신호는 PRPDA 방법을 통해 200개의 입력 벡터와 4개의 출력 벡터를 가지며, 보이드 방전, 코로나 방전, 표면 방전, 노이즈의 4개 클래스를 분류한다.

• Proceedings of the KIEE Conference
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• 1997.07e
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• pp.1853-1855
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• 1997

This paper describes the characteristics of partial discharge generated by conducting particle in cable splice using ultrasonic method. For simulating partial discharges generated by defects, outer semi conductor of cable splice as ring share electrode was used. The conductive particle was attached on the surface of cable insulator(XLPE) to examine the affection of conducting particles in cable splice. The correlation between the partial discharge quantity and the magnitude of the ultrasonic signal was investigated as the number, length, diameter and alignment of particle when applied voltage increased.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.251-252
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• 2008

In this study, we have investigated electrical properties of semiconductive materials for power cable caused by copper tape shield structure. Volume resistivity of specimens was measured by volume resistivity meter after 10 minutes in the pre-heated oven of both 23 [$^{\circ}C$] and 90 [$^{\circ}C$]. From this experimental results, the volume resistivity had different properties because of PTC/NTC tendency at between 23 [$^{\circ}C$] and 90 [$^{\circ}C$].