• Proceedings of the KIEE Conference
• /
• 2002.07c
• /
• pp.1727-1729
• /
• 2002

To cope with increasing of electric power demand in metropolitan areas, large capacity underground power cables are needed. Under such situations, our company has developed 345kV XLPE insulated cable and accessories. As the final step of development of the 345kV XLPE cable and accessories, the pre-qualification test was carried out on the test line composed of cables, pre-fabricated joints, EB-Gs and EB-As. This paper sums up the pre-qualification test conditions and the results.

• Proceedings of the KIEE Conference
• /
• 1999.11d
• /
• pp.1075-1077
• /
• 1999

XLPE cables are being used more widely all over the world as extra-high voltage transmission lines owing to the superior characteristics compared to OF cables. In view of the worldwide trend of utilizing high stress cables, we developed the accessories for 230kV XLPE cables which have smaller insulation thickness than that of present cables. The performance of the newly developed 230kV cable and its accessories has superior inital characteristics. As a result, the improved reliability of 230kV XLPE cable system has been obtained. This paper describes the major design concept and the test results of development procedure.

• Proceedings of the KIEE Conference
• /
• 1999.07e
• /
• pp.2051-2053
• /
• 1999

In this work, PD patterns and electrical trees are observed by use of the XLPE cable insulation. and the tree initiation voltage related to the contamination are also measured in order to calculate the electric stress necessary for the design of cable insulation. Throughout these works, correlation between the PD pattern and the shape of electrical tree has been observed that there may exist three distinct pattern of PD dependence on the stage of tree propagation, Such correlation could bring a basic information in connection with the partial discharge of cable system. It was also found that the electrical stress necessary for the initiation of electrical tree was measured to the 290kV/mm for the 154kV XLPE cables manufactured in KOREA.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2006.05a
• /
• pp.35-40
• /
• 2006

최근 전기에너지의 사용비율은 해가 거듭될수록 증가되고 있으며, 경량화 소형화로 인한 전력기기의 스트레스가 증가되었다. 또한 고압송전으로 인해 전기적 사고는 대형사고를 유발하므로 전력기기의 수명예측은 매우 중요한 과제이다. 이에 본 논문에서는 XLPE 절연체의 보이드 유무에 따른 부분방전 패턴을 K-means 분포통계함수를 이용하여 부분방전 패턴의 그룹화를 시도하였다. 또한 전하량과 방전빈도수의 분포를 비교하기 위해 위상-전하랑 및 위상-전하량-빈도수에 의한 그룹의 centroid 이동 변화에 대하여 조사하였다. 그 결과 보이드가 존재하는 경우 전하량의 높은 점에서 중심점을 형성하였고, 방전발생위상의 차이는 크지 않았다. 또한 위상-전하량의 클러스터보다 위상-전하량-빈도수의 클러스터에서 객체간 편차가 더 커짐을 발견하였다.

• Proceedings of the KIEE Conference
• /
• 2007.04b
• /
• pp.146-148
• /
• 2007

We studied the partial discharge detecting by sensing electromagnetic wave emitted from the partial discharge source in the MV XLPE cable with the new type of patch antenna sensor. In this study, we design new kind of Patch antenna and make many experiments compare with the existing HFCT sensor on MV XLPE cable in the laboratory. According to our experimental results our new sensor can defect pure PD and wider bandwidth 20MHz to 70MHz than HFCT and can easily localized manually on the cable.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.11a
• /
• pp.61-64
• /
• 2000

Three kinds of treeing inhibitors are added to investigate the effect on electrical properties of XLPE. The treeing inhibitors are barbituric acid, 4- (4-Nitrophenylazo) resorcinol and 4-(4-Nitrophenylazo) naphthol. Added amount of each treeing inhibitors varied form 0phr to 2.0phr. In order to know the changes of electrical properties, break down strength, tan$\delta$, and $\varepsilon$$_{r}$ were measured. Experimental results showed that electrical properties of each sample was slightly changed by amount of additives.s.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.11a
• /
• pp.73-76
• /
• 2000

The performance of insulate materials gets worse with stress time in power system and because this causes lowering of function and accidents in equipment,development and performance improvement of excellent insulate materials are needed to make stable system. In this paper, to study the influence of degradation in XLPE, inner semiconducting layer and outer semiconducting layer, we studied dielectric characteristics at temperature 25∼100[$^{\circ}C$] and frequency 20∼ 1 [MHz]

• Proceedings of the KIEE Conference
• /
• 2003.07c
• /
• pp.1888-1890
• /
• 2003

본 논문에서는 XLPE 고체 절연체내의 부분방전(partical discharge:PD)발생 및 진전에 따른 라 방사되는 UHF 대역의 방사전자파를 측정, 분석하고 PD진전에 따른 그 스펙트럼의 특성을 연구 하였다. PD를 모의하기 위해 침을 XLPE 절연체내에 삽입하고 그 사이에 보이드층을 만들었다. 고체절연체의 열화를 고려하여 일정시간 동안 일정 전압을 유지하고 이때 발생되는 방사전자파를 EMI, EMC 안테나(EMCO-3142)와 Spectrum analyzer로 측정, 분석하였다.

• Proceedings of the KIEE Conference
• /
• 2003.11a
• /
• pp.364-366
• /
• 2003

345kV XLPE Cable system was constructed between Yeongseo-Yeongdeunpo at first in Korea. XLPE cable have the advantage of OF cable. it is to raise the power transmission capacity and reduce the power loss and expenses. We also applied many new technology in this project at first. One is pre-fabricated joint which can be easily assembled in the field without any hand-skill, another is PD(Partial Discharge) test for after laying test. Especially, PD measurement for after-laying test was performed to evaluate the quality of the cable joint and termination. Through the good experience of this project, we have gotten the international competitiveness of power business.

• Proceedings of the KIEE Conference
• /
• 2003.07c
• /
• pp.1460-1462
• /
• 2003

XLPE compound have used for insulation of 22.9 [kV] power cable. XLPE compound is aged for use long time in distribution line. The cause of aging is water tree is happening and growth. Accelerated water tree test method are Accelerated volatge method and high frequency method. In this paper, high frequency accelerated water tree was performed. And the result was analysed AC breakdown voltage and size and number of water trees.