• Title, Summary, Keyword: Partial discharge

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Preventive diagnosis of the power transformer by the moving average of ultrasonic signal number (超音波 信號 數의 移動平均에 의한 電力用 變壓器 豫防診)

  • 권동진;곽희로;정상진;김정부
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.3
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    • pp.432-437
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    • 1996
  • This paper describes a diagnostic technique of power transformers by on-line detection of ultrasonic signals. A trend of partial discharge variation in a real transformer was estimated by counting the number of ultrasonic signals until insulation paper in the point-to-plane electrode is punctured. The number of electrical signals is closely related to the ultrasonic signals generated by partial discharge. The trend of the ultrasonic signal number could easily be distinguished by taking moving average. The insulation failure due to partial discharge in transformers can be predicted based on the trend analysis of ultrasonic signal number caused by partial discharge. (author). 14 refs., 10 figs.

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Korean Institute of Electrical and Electronic Materials (XLPE 전력케이블의 부분방전 측정을 위한 평면 루프 센서 설계에 관한 연구)

  • Lim, Kwang-Jin;Yang, Sang-Hyun;Lwin, Kyaw-Soe;Park, Noh-Joon;Park, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.27-31
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    • 2008
  • In this study, The new type of loop antenna which detects the partial discharge was designed based on microstrip line technology. In diagnosis of power cable, partial discharge signal generally occurred at the frequency range lower than 100MHz because high frequency PD signals could be lost along the propagation path in the cable. The new type of loop antenna sensor has been studied by using Simulation software named CST microwave studio version 5.0. In partial discharge measuring experiments, commercial HFCT sensor was used as a reference sensor. Several experiments were made over HFCT sensor and loop antenna sensor in detection partial discharge on MV XLPE cable of 22.9kV. In this study, we have shown our loop antenna sensor can apply as a commercial HFCT sensor.

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A study of Partial Discharge Condition Monitoring Equipment In the Ultra High Voltage Gas-Insulated Switchgear(GIS) for Digital Sub-station application (디지털 변전소 적용을 위한 초고압 GIS 부분방전 상태감시장치 개발 연구)

  • Kim, Young-Noh;Cho, Young-Jun;Choi, Chul-Gang;Hwang, Chul-Min;Choi, Jae-Ok;Gang, Chang-Won
    • Proceedings of the KIEE Conference
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    • pp.1380-1381
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    • 2008
  • By applying the digital sub-station, the change of various protect and measuring equipments has been applying. This paper is analyzed that the development of GIS partial discharge condition monitoring equipment is suited to the electricity IT technology and digital sub-station. It's constitution apply to be able to suit the data to high rank for GIS partial discharge condition monitoring equipment that is suited digital sub-station and Watch-dog module that be able to monitor the inner communication of the GIS partial discharge equipment. And then it also be able to apply of GIS partial discharge equipment when digital sub-station is applied.

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Partial Discharge Distribution Characteristics along Defect of CNC Cable (배전급 CNC케이블의 결함 종류에 따른 부분방전 분포특성)

  • Yoon, Jae-Hun;Kang, Seung-Hwa;Choi, Han-Sick;Lim, Gee-Jo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.102-102
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    • 2010
  • A purpose of this paper is to recognize partial discharge pattern for cable insulation. The classification of PD sources was widely studied for two decades. this research sought to use the partial discharge detection method, and to diagnose the interface of cable, which is deemed vulnerable of cable systems. A research abalyzed faults that can occur in the interface of cable joint as well as accident mechanisms, manufactured test 22.9kV CNC cable, invented artificial faults and carried out partial discharge detection experiments. As a result, various PD pattern along defect measured and distinguished.

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An Analysis of the Partial Discharge Pattern Related to the Artificial Defects Introduced at the Interface in an XLPE Cable Joint using a Laboratory Model

  • Lee, Jeon-Seon;Koo, Ja-Yoon
    • KIEE International Transactions on Electrophysics and Applications
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    • v.2C no.5
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    • pp.239-245
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    • 2002
  • In this work, in order to realize the possible defects at the cable joint interface, four different types of artificial defects are provided : conducting, insulating substances, void and scratches. The analysis related to the PD patterns has been performed by means of conventional Phase Resolved Partial Discharge Analysis (PRPDA) and Chaotic Analysis of Partial Discharge (CAPD) as well which was proposed by our previous communication. As a result, it could be pointed out that each defect has shown particular characteristics in its pattern respectively and that the nature of defect causing partial discharge could be identified more distinctively when the CAPD is combined with the conventional statistic method, PRPDA.

A Study on the Partial Discharge Resistance Properties of Epoxy/Micro/Nano Alumina Composites (에폭시/마이크로/나노알루미나 콤포지트의 부분방전 저항성특성)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.6
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    • pp.1026-1031
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    • 2016
  • Neat Epoxy, nano alumina composites, micro alumina composites and multi-nano alumina composites were prepared and experiment were performed to measure their partial discharge resistant characteristics. The partial discharge resistance obtained for the microcomposites, nanocomposites and multi-nanocomposites are compared with those of unfilled epoxy and with GDE amount for surface modifier. It was observed that compare multi-nano alumina composites to micro alumina composites, the partial discharge resistance to degradation gets improved considerably. The improvement in the degradation resistance is attributed to the interface intension between the nano alumina composites and GDE, micro alumina and epoxy neat.

An Application of the On Line Partial Discharge Measurement Method in Transformer (온라인 변압기 부분방전 측정기법 적용)

  • Kweon, Dong-Jin
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.8
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    • pp.394-400
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    • 2001
  • This paper describes an application of the on line partial discharge measurement method in operating transformer. In the operating transformer, the partial discharge signal may be superimposed by radio intereference voltage(RIV) and pulse shaped noise signals generated by external corona. The partial discharge quantity showed about 3,800pC due to very high sinusoidal interferences at the measuring impedance terminal of the transformer bushing tap. In order to reject these noises, this paper applied RIV filter, band-pass filters and noise gating method. The resulting measuring sensitivity was improved from 3,800pC to 160pC.

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A Study on the Partial Discharge Resistance Characteristic for Optimizing the Mixing Ratio of Heterogeneous Inorganic Insulated Materials for Environmentally Friendly GIS Spacer (친환경 GIS Spacer용, 이종 무기물 절연소재의 혼합비 최적화를 위한 부분방전 저항성 특성 연구)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.9
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    • pp.1189-1196
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    • 2018
  • 7 type composites (40, 45, 50, 55, 60, 65, and 70 wt.%)were prepared for the environmentally friendly GIS Spacer. Five kinds of samples were prepared for optimization of the filler content ratio (MS: MA = 1: 9, 3: 7, 5: 5, 7: 3, 9: 1) of epoxy / microsilica and microalumina. As a result of evaluation of the partial discharge resistance characteristic, surface erosion is generally slowed down as the fill amount of micro silica is increased. Also, partial discharge resistance characteristics for the development of insulating materials with optimal mixing ratios of heterologous showed a higher partial resistance of discharge and a decrease in erosion, as the filler content ratio of micro silica was larger. In the future, various researches such as electrical, mechanical, and thermal studies will be needed to develop insulating materials that can commercialize power devices in environmentally friendly insulating gas.

Analysis of Partial Discharge Characteristics at Cryogenic Temperature below 77K (77K 이하 극저온 상에서의 부분방전 특성 분석)

  • Lee, Sang-Hwa;Kim, Bok-Yeol;Shin, Woo-Ju;Lee, Bang-Wook;Koo, Ja-Yoon
    • Proceedings of the KIEE Conference
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    • pp.1562-1563
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    • 2011
  • Partial discharge measurement is one of the effective diagnostic techniques to predict abnormal high voltage dielectric insulation conditions of the electric equipments. Recently partial discharge diagnostic techniques were also utilized to evaluate the cryogenic dielectric insulation of high temperature superconducting electric equipment in liquid nitrogen. Generally, liquid nitrogen at 77 K is used used as the cryogenic and dielectric media for many high temperature superconducting high voltage applications. When a quench in the superconductor occurs, bubbles are generated which can affect the dielectric properties of the liquid nitrogen. So in order to reduce the bubble formation, subcooled nitrogen was also employed for this purpose. In this work, investigation of partial discharge characteristics of subcooled liquid nitrogen were conducted in order to clarify the retardation of partial discharge initiation voltage according to the different subcooling temperature of liquid nitrogen. And also the relation of partial discharge phenomena and the activities of bubbles were analyzed. It was observed that PD inception voltages shows rather different characteristics according to the decrease of subcooling temperature and the activities of bubbles were strongly influenced by temperature of the subcooled liquid nitrogen.

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Performance Evaluation of SHF Sensor for Partial Discharge Signal Detection on DC Rectifier (DC 정류기 부분방전 신호검출을 위한 SHF 센서의 성능평가)

  • Jung, Ho-Sung;Park, Young;Na, Hee-Seung;Jang, Soon-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.7
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    • pp.1056-1060
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    • 2012
  • Online monitoring system is becoming an essential element of railway traction system for utilized to condition based malignance management and various techniques currently employed in railway traction system. Among the various techniques, it is efficient to detect partial discharge signals by electromagnetic wave detection in order to detect insulation fault of rectifier. Although VHF (Very High Frequency), UHF (Ultra High Frequency) sensors were adopted to detect partial discharge of power facilities, due to characteristics of urban railway, excessive noise occurs from 500 MHz to 1.5 GHz on UHF bandwidth. In this paper a new measurement system able to monitoring the conditions of power facilities on DC substation in metro was studied and set up. The system uses UHF sensors to measure the partial discharge of the rectifier due to electric faulting and dielectric breakdown. Comparison and estimation for performance of SHF sensor which had devised to detect partial discharge signal of urban railway rectifier has conducted. In order to estimate performance of SHF sensor, we have compared the sensor with existing UHF sensor on sensitivity upon frequency bandwidth generated by pulse generator, and also we have verified performance of the SHF sensor by detection results of partial discharge signal from urban railway rectifier.