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4. Nonelectrical discharge detection 4.1 Introduction 4.2 Noise detection in air 4.3 Noise detection in oil insulated installations 4.4 Light detection
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4.1 Introduction Discharge magnitude 측정에는 부적절. Location of discharge 에는 유용 : light, sound 4.2 Noise detections in air 기중방전 (corona,surface, discharge) 의 위치를 acoustic method 에 의해 측정가능. 4.2.1 Audible noise 귀에 의한 방전검출 : 수백 pC 방전가능 매우 정숙한 환경 : 50pC
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4.2.2 Ultrasonic noise Narrow band : 30 ~ 50kHz ( 주파수가 낮으면 외부노이즈와 구별힘 들며, 주파수가 높으면 매질을 통과할수록 감쇠가 커진다.) 4.2.3 Trouble – shooting The acoustic method is an excellent aid for trouble shooting. 4.3 Noise detection in oil-insulated installations Fig 4.3 참조 Nonelectric detection methods 는 방전의 크기를 측정할수 없지만 external discharge 에의한 영향을 받지않기때문에 electrically noise surroundings 안에서 good result 를 얻을수 있다.
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4.3.1 Location High-voltage equipment, transformer, gas-insulated switchgear 에 위치 한다. 4.3.2 Capacitors Sensitivity : 20pC Not always clear, large capacitor is ensured. 4.3.3 solid insulation 케이블에서의 PD location 을 센서의 위치에 따라 찾기가 어려우므로, 휴 대용 센서를 이용하여 쉽게 측정가능. Fig 4.5
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4.3.4 compressed-gas insulations 4.3.5 Conclusion 방전의 종류구별에 상관없이 detection 4.4 Light detection Pd 검출시 광으로 판별 4.4.1 visual detection 4.4.2 photography
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4.9 conclusions Light detection :excellent auxiliary method for partial discharge detection and provides a sharp location at a good sensitivity, unaffected by electric disturbances in the test circuit or the mains. Photographic records usually are made at various test voltage,around and above the inception voltage.
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