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170[kV] GIB 내에서 건조공기(Dry Air)의 절연파괴 특성
한기선,윤진열,주형준,Han, Ki-Son,Yoon, Jin-Yul,Ju, Hyung-Jun 한국조명전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.10
In this paper, we changed $SF_6$ insulation gases used already in the GIB(Gas Insulated Bus, gas insulated busbar) of switching appliances of power grid 170[kV] GIS(Gas Insulated Switchgear, Gas Insulated Switchgear) with green insulation dry air gases and studied dielectric breakdown voltage characteristics by the AC voltage withstand test. Withstand test AC voltage applied to the standard KEPCO's 170[kV] GIB with dry air insulation and and the equivalent of dry air and $SF_6$ gas were examined. Breakdown voltage of dry air, using an expression of the experiments were calculated and AC Withstand criterion of dry air insulation for the AC voltage test was derived. Using the criterion, dry air gases can be used instead of the $SF_6$ gas was confirmed in the factory acceptance test at 170[kV] GIB.
한기선,주형준,윤진열,유홍근,Han, Ki-Son,Ju, Hyung-Jun,Yoon, Jin-Yul,You, Hong-Geun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
In this paper, we studied the dielectric breakdown voltage characteristics by the AC withstand voltage test on using green insulation dry air instead of $SF_6$ insulation gas used in the GIB (gas insulated bus) of 362 kV GIS (gas insulated switchgear). The AC withstand voltage test applied to the standard KEPCO's 362 kV GIB with dry air insulation, and the equivalence of dielectric breakdown voltage for dry air and $SF_6$ gas were examined, and the empirical formulas of dielectric breakdown voltage for dry air were calculated, and the criterion of AC withstand voltage test for dry air insulation was derived. Using the criterion, dry air can be used instead of $SF_6$ gas for 362 kV GIB in the factory acceptance test was confirmed.
한기선(Ki-Son Han),권동진(Dong-Jin Kweon),구교선(Kyo-Sun Koo),이병성(Byung-Sung Lee),송길목(Kil-Mok Shong) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Mineral oil is the most widely used to insulation material of transformer because of the long experience and low cost. Although mineral oil has many advantages, it posses fire hazard when it use in the buildings. Thirty years ago, fire resistant hydrocarbon fluids and mold transformer were developed such as PCBs, Silicone oil, HMWH and Cast resin transformer. Cast resin transformer is widely used in the almost buildings in Korea. Recently, the application of ester fluids have been reported. This paper compares to advantages and disadvantages of the cast resin and ester fluid transformers.
한기선(Ki-Son Han),주형준(Hyujn-jun Ju),윤진열(Jin-Yul Yoon) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
To Apply a UHF PD detecting method to power transformer, we carry out a simulation and experiment on electromagnetic wave propagation characteristics. Frequency domain measurement of propagation loss for ultra high frequency (UHF) partial discharge in the winding of power transformer using a simulation tool and experiment process is presented. We compared the result of the simulation result and experimental results of transformer mock-up windings, modeled 154㎸ 20㎹A power in KEPCO substation.
170[㎸] GIB 내에서 건조공기(Dry Air)의 절연파괴 특성
한기선(Ki-Son Han),윤진열(Jin-Yul Yoon),주형준(Hyung-Jun Ju) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.10
In this paper, we changed SF? insulation gases used already in the GIB(Gas Insulated Bus, gas insulated busbar) of switching appliances of power grid 170[㎸] GIS(Gas Insulated Switchgear, Gas Insulated Switchgear) with green insulation dry air gases and studied dielectric breakdown voltage characteristics by the AC voltage withstand test. Withstand test AC voltage applied to the standard KEPCO's 170[㎸] GIB with dry air insulation and and the equivalent of dry air and SF? gas were examined. Breakdown voltage of dry air, using an expression of the experiments were calculated and AC Withstand criterion of dry air insulation for the AC voltage test was derived. Using the criterion, dry air gases can be used instead of the SF? gas was confirmed in the factory acceptance test at 170[㎸] GIB.
윤진열,한기선,주형준,구선근,Yoon, Jin-Yul,Han, Ki-Son,Ju, Hyung-Jun,Goo, Sun-Geun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
This paper describes the characteristics of electromagnetic wave propagation in power transformer. A transformer which is similar to 154 kV single phase on-site transformer unit was provided for the purpose of the experiment. The 12 dielectric windows on the transformer enclosure to install UHF (ultra high frequency) sensors and the full scale mock ups of winding and the core were also equipped in the transformer. Every sensors to be installed to the transformer was tested and verified whether they show same characteristics or not before the experiment. A discharge gap which was used as a PD (partial discharge) source moved to several necessary locations in the transformer to simulate dielectric defects. Propagation times of electromagnetic wave signal from PD source to sensors decided by the routes of both reflection phenomenon and diffraction phenomenon were compared each other. The experimental results showed propagation route of the PD signal makes an effect on the frequency spectrum of front part of the signal and the magnitude of the signal and propagation time of the signal when the signal is captured on the sensor.
주형준,한기선,윤진열,Ju, Hyung-Jun,Han, Ki-Son,Yoon, Jin-Yul 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
Frequency domain measurement of propagation loss for ultra high frequency (UHF) partial discharge in the winding of power transformer using a spectrum analyzer and pulse generator is presented. We compared the performance of the method using a network analyzer with and without a winding. Using a network analyzer simplifies the measurement and offers better dynamic range and frequency range. It also provides precise propagation loss within the winding in frequency domain at UHF range. We applied this method to measure UHF propagation loss of transformer mock-up, modeled 154 kV 20 MVA power in KEPCO substation.
주형준(Hyung-Jun Ju),한기선(Ki-Son Han),구선근(Sun-Geun Gu),윤진열(Jin-Yul Yoon) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
한전의 변전소 345㎸ GIS에서 부분방전 측정용 수행하였다. 부분방전 정밀측정 기술지원은 신가평 변전소 362㎸ GIS을 대상으로 수행하였고 여러 부분방전 측정 전문기관의 잘못된 방전위치 추정하여 GIS 개방점검시 결함위치 제거에 실패하여 정확한 방전위치를 정밀측정하였다. GIS 내부 결함 유무 및 위치를 판정하기 위해 현장 정밀측정용 한 결과 GIS 내부에서 발생하는 부분방전 신호중 절연체 결함에 의한 부분방전신호임을 확인하였다. 방전의 위치는 오실로스코프를 이용하여 TOA(Time of Arrival)방식을 통하여 위치를 확인하였다.
주형준(Hyung-Jun Ju),한기선(Ki-Son Han),윤진열(Jin-Yul Yoon) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
This paper was provided to help in detecting defects in power transformer. For this purpose, Surface discharge cells was designed and manufactured to simulate creeping partial discharge defect on paper-oil insulation surface. And compared the PD signal charecteristics in new Oil and Used Oil Breakdown phenomenon in the Surface discharge cell was examined when increasing the applied voltage in new oil and used oil. And PRPD(Phase Resolved Partial Discharge) pattern of the surface discharge cell was examined too.