• Title, Summary, Keyword: Partial discharge

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A study on the PD detecting of C-GIS using AE sensor (AE센서를 이용한 C-GIS의 부분방전 검출에 관한 연구)

  • Lee, H.Y.;Lee, Y.H.;Sin, Y.S.;Seo, J.M.
    • Proceedings of the KIEE Conference
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    • pp.1659-1661
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    • 2003
  • Recently, diagnostic techniques have been investigated to defect a partial discharge in high voltage electrical equipment. We have studied the characteristics of the acoustic partial discharge originating from the electrical defects in cubicle GIS(C-GIS). An acoustic emission(AE) sensor is used on the enclosure to detect partial discharge source because the sensor is sensitive to stress waves in its frequency range that may not be from a partial discharge source. AE signal is analyzed with phase-magnitude-frequency number(${\Phi}$-V-n) and pulse per second(PPS). Experience result has shown that the omitted acoustic signal has phase dependency and phase shift characteristic according to increase with applied voltage. These result will be helpful to the pattern recognition of the acoustic partial discharge in a C-GIS.

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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.

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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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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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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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.

Partial Discharge Phenomenon with $SF_6$ Gas Pressures in Insulation consisting of Insulation Paper and $SF_6$ Gas (SF_6 가스와 절연지의 절연계에서 가스압력에 따른 부분방전현상)

  • 선종호;김광화;박정후;조정수
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.2
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    • pp.65-71
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    • 2001
  • This paper describes partial discharge phenomenon with SF6gas pressures in insulation consisting of insulation paper and SF6 gas. We made the specimens with SF6 gas gaps which exist between aramid papers and electrodes and calculated the electric field intensity in the these gaps. We measured the partial discharge inception voltages and the AC breakdown voltages with the test method of IEC 60060-2 and did the partial discharge degradation experiments with a constant voltage. According to gas pressures, the breakdown voltages in SF6gas gaps were calculated by Paschen's law. And these results showed the ability applying partial discharge inception voltages evaluation to Paschen's law and the relationship between the PD quantities occurring insulation breakdown and PD occurring area.

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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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A Study on the Partial Discharge Pattern Recognition by Use of SOM Algorithm (SOM 알고리즘을 이용한 부분방전 패턴인식에 대한 연구)

  • Kim Jeong-Tae;Lee Ho-Keun;Lim Yoon Seok;Kim Ji-Hong;Koo Ja-Yoon
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.10
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    • pp.515-522
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    • 2004
  • In this study, we tried to investigate that the advantages of SOM(Self Organizing Map) algorithm such as data accumulation ability and the degradation trend trace ability would be adaptable to the analysis of partial discharge pattern recognition. For the purpose, we analyzed partial discharge data obtained from the typical artificial defects in GIS and XLPE power cable system through SOM algorithm. As a result, partial discharge pattern recognition could be well carried out with an acceptable error by use of Kohonen map in SOM algorithm. Also, it was clarified that the additional data could be accumulated during the operation of the algorithm. Especially, we found out that the data accumulation ability of Kohonen map could make it possible to suggest new patterns, which is impossible through the conventional BP(Back Propagation) algorithm. In addition, it is confirmed that the degradation trend could be easily traced in accordance with the degradation process. Therefore, it is expected to improve on-site applicability and to trace real-time degradation trends using SOM algorithm in the partial discharge pattern recognition