• 제목/요약/키워드: PD magnitude

검색결과 104건 처리시간 0.031초

전력케이블에서 교류전압과 진동파 전압을 이용한 부분방전 측정 (Partial Discharge Detection for the Power Cables using AC and Oscillating wave Voltage)

  • 김정태;김남준;이전선;구자윤
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제48권4호
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    • pp.247-252
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    • 1999
  • In this paper, in order to investigate availability of the OW-PD measurement method which has been proposed as an alternative of AC-PD measurement method to an after laying test and/or diagnosis for the power cable system, partial discharges owing to the needle-type defect integrated into the cable have been measured using AC and OW(Oscillating Wave) voltages. In the AC-PD measurement, the magnitude, phase and pulse number of partial discharges have been changed with the duration of voltage application, which can be analyzed through the relation with the process of the electrical tree initiation and propagation. In addition, the characteristics of partial discharges using OW voltage are appeared to be similar to those in case of AC-PD measurement and to be different with the shapes of electrical tree. From these results, it is concluded that the OW-PD measurement method is available to the tests for the cable system.

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LabView 기반 부분방전 분석장치의 설계 및 제작 (Design and Fabrication of a LabView Based Partial Discharge Analyzer)

  • 차현규;이정윤;박대원;길경석
    • 한국전기전자재료학회논문지
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    • 제25권3호
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    • pp.229-235
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    • 2012
  • This paper dealt with the fabrication of a partial discharge (PD) analyzer for insulation diagnosis of power facilities like transformers, cables and gas-insulated switchgears. An analytic algorithm for the phase (${\phi}$), the magnitude (q), and the pulse count (n) of PD pulse was designed and a time-frequency (TF) map algorithm was applied in the system to eliminate noises by analyzing the time and the frequency component of signals. All the algorithms were operated by a LabView graphical program. The detection circuit consists of a coupling capacitor, a detection impedance, and a low noise amplifier. A plane-plane and a point-plane electrode system were fabricated to simulate different types of insulation defects. In the experiment, we could easily understand the characteristics of PD pulses using the prototype PD analyzer.

GIS내 PD 종류에 따른 UHF신호의 특성연구 (A study on the UHF signal Characteristics by two kinds of PD in GIS)

  • 송현석;이재화;장덕근;이동준;곽희로
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2002년도 학술대회논문집
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    • pp.251-255
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    • 2002
  • This paper describes the analysis of UHF signals taking place at partial discharges due to defects in GIS. To imitate the defects, two kinds of electrode were employed. One is to generate the PD due to corona discharge, and the other surface discharge. As a result, the magnitude of the UHF signals acquired from the discharges increased with the applied voltage. However, each frequency distribution trend at corona discharges and surface discharge was similar even though the applied voltage increased. Frequency distribution between corona discharge and surface discharge was clearly distinguish.

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가압 수소가 발전기 고정자 권선 절연 열화와 부분 방전 특성에 미치는 영향 (The Effect of Pressurized Hydrogen on the Aging and Partial Discharge Activity in Generator Winding Insulations)

  • 김진봉
    • 한국안전학회지
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    • 제14권4호
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    • pp.100-107
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    • 1999
  • The purpose of the study is to investigate the effect of H$_2$ pressure on partial discharge (PD) activity and aging rate in turbine generator winding insulations. A series of field tests and laboratory tests were peformed to investigate the effect of $H_2$ pressure on PD activity. Field tests were conducted at two unit turbine generators in two conditions, in $H_2$ pressure and in air atmosphere. Obtained results are as follows ; 1) ${\Delta}tan{\delta}$ and maximum partial discharge are reduced with increase of $H_2$ pressure and partial discharge inception voltage. 2) The reduction ratio of ${\Delta}tan{\delta}$ due to $H_2$ pressure is higher than one of PD magnitude. 3) Partial discharge pulses suffer from attenuation and distortion when transmitted along windings, because of the complex L-C network between windings. From the result, partial discharge pulses are subjected to resonance phenomena in a generator winding.

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산소 분리를 위한 무공성 세라믹- 금속 복합 무기막 (Dense Ceramic-metal Composite Inorganic Membranes for Oxygen Separation)

  • 김진수
    • 한국막학회:학술대회논문집
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    • 한국막학회 2002년도 춘계 총회 및 학술발표회
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    • pp.35-41
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    • 2002
  • Dense oxygen ionic conducting materials can be used for oxygen separation membranes at high temperatures. However, they show relatively low permeation flux because of their large resistances. To reduce resistances and improve the oxygen permeation flux, thin dense yttria-stabilized-zirconia (YSZ)/Pd composite dual-phase membranes were fabricated by a new approach that combines the reservoir method and chemical vapor deposition (CVD). A thin porous YSZ layer was coated on a porous alumina support by dip-coating the YSZ suspension. A continuous Pd phase was formed inside pores of the YSZ layer by the reservoir method. The residual pores of the YSZ/Pd layer were plugged with yttria/zirconia by CVD to ensure the gas tightness of the membranes. The oxygen permeation fluxes through these composite membrane were 2.0$\times$10$^{-8}$ mol/cm$^2$.s and 4.8$\times$10$^{-8}$ mol/cm$^2$.s at 105$0^{\circ}C$ when air and oxygen were used as the permeate gases, respectively. These oxygen permeation values are about 1 order of magnitude higher than those of pure YSZ membranes prepared under similar conditions.

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GIS 단로기 내부의 부분방전 신호분석 (The signal analysis of PD in DS for GIS)

  • 김종서;;천민우;박노봉;박용필
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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    • pp.679-682
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    • 2004
  • GIS equipment has problems on confidence according to long-time usage, development of diagnosis technique has been importantly recognized accordingly. Therefore. measurement and analysis of PD has been generally used much equipment of GIS. But, in case of measurement of PD at field, real trouble signals are difficult to classify noise. Accordingly, a variety of trouble conditions for DS were simulated, and detected signals were analyzed by the application of electrical and mechanical methods. For this analysis, detected signals were accumulated according to phase-magnitude with the application of Induction sensor, and then we analyzed the characteristics. For the simulation experiment, we made DS for 170kV GIS and analyzed the characteristics of detected signals with the application of neural network algorithm.

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GIS 단로기 내부의 이상신호 분석 (Analysis of trouble signal of inner DS for GIS)

  • 김종서;이은석;박용필
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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    • pp.1207-1210
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    • 2004
  • Recently, because GIS equipment has problems on confidence according to long-time usage, development of diagnosis technique has been importantly recognized. Therefore. measurement and analysis of PD has been generally used much equipment of GIS. But, in case of measurement of PD at field, real trouble signals are difficult to classify noise. Accordingly, a variety of trouble conditions for DS were simulated, and detected signals were analyzed by the application of electrical and mechanical methods. For this analysis, detected signals were accumulated according to phase-magnitude with the application of Induction sensor, and then we analyzed the characteristics. For the simulation experiment, we made DS for 170kV GIS and analyzed the characteristics of detected singals with the application of neural network algorithm

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변압기내 부분방전 탐지 및 위치검출 (Detection and Location of Partial Discharge in Transformers)

  • 곽희노;김재철;황선주;권태원;윤용범
    • 한국조명전기설비학회지:조명전기설비
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    • 제6권4호
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    • pp.53-59
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    • 1992
  • This paper describes an instrument for the detection and geometric location of partial discharge (PD) source in transformers. This instrument measures electric current pulses and ultrasonic pulses simultaneously, counts the number of electrical pulses and determines the geometric location of PD in transformers. It was found that there is a relationship between partial discharge magnitude and pulse repetition rate when the applied test voltage and oil temperature were varied. Through the laboratory test using model transformer, it was clarified that this detector could be used for detecting and locating PD in the transformer.

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로고스키 코일과 초음파 센서를 이용한 변압기내 부분방전 탐지 및 위치검출 (Detection and Location of Partial discharge in Transformers Using Logoski coil and Ultrasonic sensor)

  • 곽희로;김재철;김웅상;한민구;권태원;윤용범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1990년도 하계학술대회 논문집
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    • pp.279-282
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    • 1990
  • This paper describes an nstrument for the detection and geometric location of partial discharge(PD) sources in transformers. This instrument measures electric current pulses and ultrasonic pulses simultaneously, counts the number of electrical pulse and determines the geometric location of PD in transformers. It was found that there is a relationship between partial discharge magnitude and pulse repetition rate when the applied test voltage and oil temperature were varied. Through the laboratory test using model transformer, it was clarified that this detector could be used, satisfactory for detecting and locating of PD in the transformer.

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Aniline이 첨가된 LDPE에서 부분방전 펄스 분석에 의한 트리성장 길이의 인식 (RECOGNITION OF TREE GROWING USING PD SIGNAL ANALYSIS IN LOW DENSITY POLYERHYLENE BLENDED WITH ANILINE)

  • 육형상;강성화;임기조;박수길;박대희
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1994년도 추계학술대회 논문집
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    • pp.202-205
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    • 1994
  • There is a close relation between electrical treeing and internal partial discharges in solid dielectrics. In this paper, the characteristics of electrical treeing and partial discharge in solid dielectrics are investigated. We carried out the measurements of electrical treeing and PD(partial discharge) characteristics. From the experimental results, we found out that maximum PD magnitude increased linearly with time at first stage, thereafter increased remarkably. These tendencies are very similar to the characteristics of tree growth with time.