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자료유형
학술저널
저자정보
김동언 (한국해양대학교) 김남훈 (한국해양대학교) 임승현 (한국해양대학교 전기전자공학과) 길경석 (한국해양대학교)
저널정보
한국전기전자재료학회 전기전자재료학회논문지 전기전자재료학회논문지 제34권 제2호
발행연도
2021.1
수록면
136 - 141 (6page)

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Heating cables, widely used in office buildings, factories, streets and railways, deteriorate in electricalinsulation during operation. The insulation deterioration of heating cables leads to electric discharges that can causeelectrical fires. With this background, this paper dealt with a condition monitoring technique for heating cables by theanalysis of discharge signals to prevent electrical fires. Insulation deterioration was simulated using an arc generatorspecified in UL1699 under AC operation, and the characteristic and propagation of discharge signals were analyzed on a 100 meter-long heating cable. Discharge signals produced by insulation deterioration were detected as a voltage pulse because they are as small as a few mV and they are attenuated through propagation path. The frequency spectrum of discharge signals mainly existed in the range from 70 kHz to 110 kHz, and the maximumattenuation of the signal was 84.8% at 100 meters away from the discharge point. Based on the experimental results, a monitoring device, which is composed of a high pass filter with the cut-off frequency of 70 kHz, a comparator, a wave shaper and a microprocessor, was designed and fabricated. Also, an algorithm was designed to discriminate the discharge signal in the presence of noise, compared with the pulse repetition period and the number of pulse counts per 100ms. In the experiment, the result showed that the prototype monitoring device could detect and discriminate the discharge signals produced at every discharge point on a heating cable.

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