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Examination of Conductor and Sheath Temperatures Dependent on the Load Currents through High-Power Live Cables at a Power Station

발전소에서 활선 고전력 케이블의 운전 부하전류에 따른 도체 및 피복표면의 온도 분석

  • Um, Kee-Hong (Dept. of Information Technology, Hansei University)
  • Received : 2016.11.14
  • Accepted : 2017.02.03
  • Published : 2017.02.28

Abstract

High-voltage power systems operate in order to generate and transmit electric power at power stations. Compared to low-power systems, high-power systems are complex in structure, large-scale, and expensive. When high-power cable accidents occur, most facilities are incapacitated-including low-power systems-causing huge economic losses. Great care must therefore be taken in designing, installing and managing power systems. Although dependent on installation circumstances and usage conditions, in some cases the cross-sectional areas of cables fall short of the critical area due to the expansion of and improper design and installation of power facilities. In this situation, the exceeded ampacity (allowable current) above the critical value caused by the operating current initiates the deterioration processes of power cables. In order to systematically monitor power cables operating at power stations, we have developed the first device of its kind in Korea. In this paper, we present the analyzed characteristics of expected temperatures of cables based on the load current of high-voltage cables operating at Korean Western Power Co. Ltd. We can predict the lifetime of cables by analyzing the temperature obtained from our device.

발전소에서 전기를 생산 및 공급하기 위하여 고전압 전력 시스템이 동작하고 있다. 고전압 시스템은 저전압 시스템과 비교하여 구조가 복잡하고, 규모가 크고, 가격이 비쌀 뿐만 아니라. 사고 발생시 저압 시스템을 포함하는 대부분의 설비들에 정전사고가 발생하여 막대한 경제적 손실을 초래한다. 설계부터 시공 및 관리를 더욱 철저히 해야 한다. 설치환경 및 사용 조건 부하량 등에 따라 차이가 있겠지만, 증설과정, 부적절한 설계 등으로 인하여 케이블의 단면적이 부족할 경우가 발생하며, 운전 전류에 의하여 초과된 허용온도는 케이블의 열화 상태를 초래한다. 우리는 케이블의 사고를 체계적으로 감시 및 예방하기 위한 측정 장비를 개발, 한국서부발전 주식회사(Korean Western Power Co. Ltd.)에 설치하여 활선 케이블을 진단하였다. 이 논문에서 우리는 케이블의 부하전류를 측정하고, 측정된 부하전류에 의한 온도 특성을 예측 연구한 결과를 제시한다. 이 온도 값을 해석하여 케이블의 열화에 미치는 영향을 예측할 수 있다.

Keywords

References

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