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유입 변압기에서 폴디드 다이폴형 센서의 부분방전 펄스 검출 특성
金光和(Kwang-Hwa Kim),李相和(Sang-Hwa Yi),宣鍾好(Jong-Ho Sun),姜東植(Dong-Sik Kang),金載哲(Jae-Chal Kim) 대한전기학회 2006 전기학회논문지C Vol.55 No.10
This paper describes that the distribution of electromagnetic field occurred by PD(Partial Discharge) pulse was calculated with simulation program and characteristics of calibration and PD pulses measured with folded dipole types sensors were analyzed. As the distribution of electromagnetic field in simulation was very random the wide band measuring methods were good. Therefore three folded dipole antenna types sensors which had different their widths were designed and made. The signal according to direction and distance between sensor and pulse source in these sensor was measured and the spectrum of surface PD were acquired in the experiment of model transformer. In this result the characteristics of sensor which had middle width was better than others and the main spectrum of PD signals in surface discharge were existed in around 220㎒, 320㎒ and from 450㎒ to 750㎒.
김광화(Kwang Hwa Kim),이상화(Sang Hwa Yi),선종호(Jong HO Sun),한상보(Sang Bo Han),김민규(Min Kyu Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
This paper was described about the calibration method and setup of calibration system. This method and system were based on ISO 12713 and 12714. This system consisted of a conical type reference sensor, test block, glass capillary source and measuring oscilloscope. The waves of reference sensor and tested sensor was shown and these wave was analyzed with ISO method.
GIS에서 주파수 특성을 갖는 이중 대역법에 의한 UHF 부분방전 측정기술
金光和(Kwang-Hwa Kim),李相和(Sang Hwa Yi),宣鍾好(Jong Ho Sun),姜東植(Dong Sik Kang) 대한전기학회 2006 전기학회논문지C Vol.55 No.3
This Paper describes a dual bands PD measurement method which has two different bandwidths. The one bandwidth is 0.5 - 2 ㎓ and the other is 1 - 2 ㎓. This method is used for GIS diagnosis. In the experiment, it shows that the ratios between two PD quantities in dual bands depend on the defect types and gas pressures. The variations of ratios in different pressures are more sensitive than ones in defect types. And These ratios increase with increasing SF6 gas pressures. As these ratios give us additive information of PD we can analyze the defect type as well as risk assessment for the GIS reliably. Therefore the above result shows that these ratios are one of parameters for diagnosing GIS.
UHF 부분방전 센서 보정을 위한 표준 전자계 생성 장치
이상화(Sang-Hwa Yi),선종호(Jong-Ho Sun),김광화(Kwang-Hwa Kim),강동식(Dong-Sik Kang) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.5
대상 전력기기와 위치가 정해지지 않은 상태에서 UHF 부분방전 센서의 성능 측정시, 유효높이는 유용한 파라메터이며 이를 용이하게 측정하기 위해서 표준전계 발생장치가 필요하다. 표준전계를 발생을 위해 평행판 전송선로 형태의 TEM Line을 설계 제작하였으며, 제작된 TEM Line의 특성을 살펴보았고, 표준프로브법을 이용하여 TEM Line의 내부 전계를 보정하기 위한 실험을 실시하였다.