The Journal of the Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회논문지)

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
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Development of Equipment to Measure Insulation Resistance and Evaluate the Lifetime of High-voltage Cable in Operation

운전 중인 고전압 케이블의 절연저항 측정 및 수명평가장치의 개발

  • Received : 2014.08.08
  • Accepted : 2014.10.10
  • Published : 2014.10.31
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Abstract

In this paper, we find out the lifetime index in order to determine the time-dependent trend of deteriorating performance of 6.6kV high-voltage power cable in operation at a power station. The cable systems used in our study have been in operation for 13 years. With measurements for the 13 years, we analyzed the insulation resistances. By developing measuring equipment (comprized mainly of transformer, temperature sensor, and LPF) operating by the three-phase electric power, we analyzed the changing characteristics of insulation resistance of power cable. In contrast to 22kV cables, 6.6 kV cables have thicker insulation. Therefore the characteristics of 6.6kV cables are different from that of 22kV cables. The study found that as time passes, the insulation resistance does not decrease continuously; it decreases to a certain value, then does not decrease any more and shows properties of oscillation. We could not detect the process of deterioration in the preceding twelve years. The cable system showed great stability so that deterioration was not apparent. In this case, it is not possible to measure the future life indices of power cables because the lifetime indices are not predictable

이 논문은 발전소에서 설치 운전 중인 6.6kV 고전압 케이블이 시간에 따라 성능이 악화되는 현상의 추세를 결정하는 수명지수를 파악하기 위한 논문이다. 우리가 연구한 케이블 시스템은 설치 후 13 년 동안 운전하고 있다. 삼상전력에 연결되는 변류기, 온도센서 LPF 등을 이용한 측정장치를 개발하여 케이블의 절연저항 변화 특성을 해석하였다. 고전압 22kV 케이블과 비교하면 절연체의 두께가 더 두껍기 때문에 특성을 다르게 나타낸다. 동작시간이 경과함에 따라, 절연저항이 계속 감소하지 않음을 확인 하였다. 일정한 값으로 감소하다가 더 이상 감소하지 않고 상하진동하는 특성을 나타내었다. 지난 13 년 동안의 열화과정을 파악할 수 없었지만, 시스템이 안정 상태에서 동작을 하였다는 사실은 열화가 아직 발생하지 않았다는 의미이다. 이런 경우에는, 수명지수를 예측할 수 없기 때문에 케이블의 수명을 정량적으로 예측할 수 없음을 확인하였다.

Keywords

References

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