• Title/Summary/Keyword: PD magnitude

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

  • Kim, Jeong-Tae;Kim, Nam-Jun;Lee, Jeon-Seon;Gu, Ja-Yun
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.4
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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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Design and Fabrication of a LabView Based Partial Discharge Analyzer (LabView 기반 부분방전 분석장치의 설계 및 제작)

  • Cha, Hyeon-Kyu;Lee, Jung-Yoon;Park, Dae-Won;Kil, Gyung-Suk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.3
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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.

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

  • 송현석;이재화;장덕근;이동준;곽희로
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2002.11a
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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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The Effect of Pressurized Hydrogen on the Aging and Partial Discharge Activity in Generator Winding Insulations (가압 수소가 발전기 고정자 권선 절연 열화와 부분 방전 특성에 미치는 영향)

  • 김진봉
    • Journal of the Korean Society of Safety
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    • v.14 no.4
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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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Dense Ceramic-metal Composite Inorganic Membranes for Oxygen Separation (산소 분리를 위한 무공성 세라믹- 금속 복합 무기막)

  • 김진수
    • Proceedings of the Membrane Society of Korea Conference
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    • 2002.05a
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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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The signal analysis of PD in DS for GIS (GIS 단로기 내부의 부분방전 신호분석)

  • Kim, Jong-Seo;Kim, Jin-Tea;Cheon, Min-Ou;Park, No-Bong;Park, Yong-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.11a
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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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Analysis of trouble signal of inner DS for GIS (GIS 단로기 내부의 이상신호 분석)

  • Kim, Jong-Seo;Lee, Eun-Suk;Park,, Yong-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07b
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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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Detection and Location of Partial Discharge in Transformers (변압기내 부분방전 탐지 및 위치검출)

  • 곽희노;김재철;황선주;권태원;윤용범
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.6 no.4
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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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Detection and Location of Partial discharge in Transformers Using Logoski coil and Ultrasonic sensor (로고스키 코일과 초음파 센서를 이용한 변압기내 부분방전 탐지 및 위치검출)

  • Kwak, Hee-Ro;Kim, Jae-chul;Kim, Eung-Sang;Han, Min-Koo;Kwan, Tae-Won;Yoon, Young-Beum
    • Proceedings of the KIEE Conference
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    • 1990.07a
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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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RECOGNITION OF TREE GROWING USING PD SIGNAL ANALYSIS IN LOW DENSITY POLYERHYLENE BLENDED WITH ANILINE (Aniline이 첨가된 LDPE에서 부분방전 펄스 분석에 의한 트리성장 길이의 인식)

  • 육형상;강성화;임기조;박수길;박대희
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1994.11a
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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.