• Title, Summary, Keyword: Partial discharge

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On-line Measurement of Partial Discharge (활선상의 부분방전 측정 방법)

  • Paek, Kwang-Hyeon;Choi, Yong-Sung;Park, Dae-Hee;Lee, Chang-Soo
    • Proceedings of the KIEE Conference
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    • pp.1936-1938
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    • 2004
  • In this paper, we discussed measurement method of PD (Partial Discharge) of 22.9[kV] cable. Cable rail track laying portable detector that can detect partial discharge of cable connection ashes by on-line done spot way to detect Lemke equipment and high broadcasting CT sensor that use antenna sensor using ICM mounting was explained. Because measurement corona signal is very big, analysis of partial discharge is difficult state, we used connector. It could be attenuated by 2 times. We found out that corona signal which generated on B phase is flowed on A phase and C phase. It could measure that partial discharge of A phase happens actually. We could confirm that partial discharge of about 250 ${\sim}$ 300 [pC] on A phase is dangerous.

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Effect of Electric Frequency on the Partial Discharge Resistance of Epoxy Systems with Two Diluents

  • Park, Jae-Jun
    • Transactions on Electrical and Electronic Materials
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    • v.14 no.6
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    • pp.317-320
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    • 2013
  • Partial discharge resistance for the epoxy systems with two diluents was investigated in the rod-plane electrodes arrangement, and the effect of electric frequency on the partial discharge resistance was also studied. Diglycidyl ether of bisphenol A (DGEBA) type epoxy was used as a base resin, and 1,4-butanediol diglycidyl ether (BDGE) or polyglycol (PG) as a reactive diluent was introduced to the DGEBA system, in order to decrease the viscosity of the DGEBA epoxy system. BDGE was acted as a chain extender, and PG acted as a flexibilizer, after the curing reaction. To measure the partial discharge resistance, 5 kV alternating current (ac) with three different frequencies (60, 500 and 1,000 Hz) was applied to the specimen in a rod-plane electrode arrangement, at $30^{\circ}C$. PG had a good effect, while BDGE had a bad effect on the partial discharge resistance of the DGEBA system, regardless of the electric frequency.

A Study on Partial Discharge Diagnostic System for Power Cable using RLCR

  • Park, Keeyoung;Choi, Hyungkee;Lee, Chulhee;Hong, Soomi
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.1
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    • pp.43-47
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    • 2016
  • This system is a diagnosis system that checks whether it causes a partial discharge of a power cable or not. It is to classify normal from abnormal-normal, PD (Partial Discharge) sound through analysis of RLCR (Relative Level Crossing Rate) and spectrogram energy algorithm. Partial discharge diagnostic system has a function that stores PD sound and analyzes the data. The wave shape of PD sound is similar to noise and is systematically generated by partial discharge. Therefore, in this paper, we could discreminate between normal and abnormal case using relative level crossing rate (RLCR) and spectrogram of frequency energy rate.

Time Delay Characteristics of Radiated Electromagnetic Wave with Partial Discharge (부분방전시 방사전자파의 시간지연특성)

  • Kim, Hae-Joon;Park, Kwang-Seo;Lee, Hyun-Dong;Kim, Ki-Chai;Lee, Kwang-Sik
    • Proceedings of the KIEE Conference
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    • pp.1774-1776
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    • 2001
  • The most of faults in gas insulation of power facilities are caused by partial discharge. Therefore we simulated partial discharge and measured the radiated electromagnetic wave emitted from partial discharge in the $SF_6$ gas by biconical antenna. This paper describes time delay characteristics of radiated electromagnetic waves with distance between antenna and discharge source.

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Lift-Off Voltage and Partial Discharge Characteristics of Free Metallic Particles in GIS (GIS 내 금속입자의 부상전압과 부분방전특성 연구)

  • Yun, Jin-Yeol;Han, Sang-Ok
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.2
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    • pp.127-132
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    • 1999
  • Both motion of free metallic particles from which most GIS internal failures are caused and partial discharges from the particles were examined using EHV GIS test chamber. Effects from particle length and gas pressure which are main factors to lead to breakdown failure were investigated theoretically and experimentally. Magnitude of both lift-off voltage and partial discharge inception voltage were measured respectively and, through these measurements, this paper showed the possibility of predicting breakdown fault and of taking action to prevent the fault in advance. The measurement of partial discharge when the particles began to move could be adopted to decide minimum sensitivity in developing predictive diagnostic equipments. Both the amount of apparent discharge and real discharge in GIS were examined theoretically and experimentally, then experimental results were analyzed on the basis of the theory.

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Partial Discharge Position Tracking Method using a GIS Partial Discharge Signal and Arrival Time Difference (GIS 부분방전 신호와 도착 시간차 분석을 통한 PD발생 위치 추적)

  • Choi, Mun-Gyu;Cha, Hanju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.9
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    • pp.1297-1301
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    • 2013
  • This paper analyzes of PD occurrence position through an analysis of the arrival time difference between the GIS partial discharge signal. Because of GIS (Gas Insulated Switchgear) is a facility very important power equipment and as part of the equipment that make up the power system, the stabilization of the power industry, which accounted for 88.5% share of GIS substation in the form of a substation is an important equipment for power supply. In the situation where we are gradually expanding the need for preventive diagnosis in order to improve the efficiency of equipment management and failure prevention for Preventive diagnosis. In this paper as a method for extracting pre-defect of failure of GIS Apply the average value method of calculating the 5 times each using a pulse of the first time of the second pulse (${\Delta}t$) with an oscilloscope generation position PD(Partial Discharge). the results of GIS internal inspection, the partial discharge of the actual the position of the partial discharge was confirmed with an accuracy of about 82% of positions. Arrival time difference in the most effective manner if the partial discharge of GIS internal occurs by applying the averaging method and TOA(Time of arrival) method, the partial discharge occurs you through the measurement and analysis of PD signal occurs was confirmed in the experiment are presented and diagnostic methods location tracking.

Normalization Diagnosis of Aging Process on Partial Discharge Signals of CV Cable (CV케이블의 부분방전 신호를 통한 열화과정의 정량적 진단)

  • 소순열;임장섭;김진사;이준웅;김태성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.451-455
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    • 1997
  • The partial discharge has been blown as the chief breakdown of power equipments. The analysis and the recognition is much difficult because the partial discharge signal is very small and has complex aging pattern. Recently, insulation aging diagnosis based on pattern of phase(Ф), partial discharge magnitude(q), number(n) has been very important. Owing to depreciate the reappearance of aging progress at the electrical tree pattern and to be difficult to analyze visually, the study on partial discharge pattern is suggested to normalizing analysis method of partial discharge signals. This parer is purposed on prediction of life-time measurement of cv-cable, on decision of risk degree with normalization and real-time measurement of partial discharge signals for aging diagnosis of cv-cable. As normalizing the aging signals of electrical tree in cv-cable, it is able to confirm risk degree of insulation material with the distribution of Ф-q-n and recognize the process of aging pattern using neural network.

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Partial Discharge Measurements of Artificial Defects in HTS Transformer Model using HFCT

  • Lee, S.H.;Shin, W.J.;Park, T.G.;Koo, J.Y.;Lee, B.W.
    • Progress in Superconductivity
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    • v.11 no.1
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    • pp.13-18
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    • 2009
  • Partial discharge measurements in cryogenic dielectric materials of HTS transformer are very important because partial discharge was regarded as primary source for ageing and breakdown of cryogenic materials. But, partial discharge measurement techniques and its effects in low temperature high voltage environments were not suggested and there exist only a few reports on this research fields. Therefore, in order to implement reliable HTS transformers, partial discharge diagnosis techniques for cryogenic materials of HTS transformers were investigated using partial discharge (PD) pattern analysis methods. In this works, four different types of artificial defects including turn to turn insulation, free moving particle, void and protrusion, have been fabricated since it was commonly regarded that they might cause the sudden service failures of the power apparatus. For this purpose, these defects are installed into the dielectric materials in liquid nitrogen and experimental investigations have been carried out for the diagnosis of HTS transformer. And various PD patterns caused by the amount of quench of superconductors were analyzed. Throughout this works, the different PD patterns in cryogenic dielectric materials in liquid nitrogen, and PD measuring technique could be the fundamental steps to establish diagnosis technologies of HTS transformer for power applications.

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A Comparative Study of The PD Pattern Analysis Based on PRPD and CAPD for The Diagnosis of Gas Insulated Transformer (GITr(Gas Insulated Transformer) 내부에 발생되는 PD 신호의 패턴분석을 위한 PRPD와 CAPD 적용결과 비교)

  • Jung, Seung-Yong;Koo, Ja-Yoon
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.6
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    • pp.308-312
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    • 2006
  • Partial Discharge (PD) phenomena occurred by different nature of insulating defects has been regarded as a random process by which Phase Resolved Partial Discharge Analysis(PRPDA) has been proposed and then commercially accepted for the diagnosis of the power apparatus since more than three decades. Moreover, for the same purpose, a novel approach based on the Chaotic Analysis(CAPD) has been proposed since 2000, in which Partial Discharge(PD) phenomena is suggested to be considered as a deterministic dynamical process. In this work, for the diagnosis of Gas Insulated Transformer(GITr), four different types of specimen were fabricated as a model of the possible defects that might possibly cause its sudden failures such as turn to turn insulation, inter coil insulation, free moving particle and protrusion. For this purpose, these defects are introduced into the Gas Insulated Transformer(GITr) mock-up and experimental investigations have been carried out in order to analyze the related Partial Discharge(PD) patterns by means of both Phase Resolved Partial Discharge Analysis(PRPDA) and Chaotic Analysis(CAPD) respectively and then their comparisons are made systematically.

Analysis of the Ultrasonic Signals by the Partial Discharge and Noises from the Transformer (변압기 부분방전과 노이즈에 의한 초음파 신호 분석)

  • Gwon, Dong-Jin;Jeong, Gil-Jo;Jin, Sang-Beom;Gwak, Hui-Ro
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.51 no.8
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    • pp.354-360
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    • 2002
  • The partial discharge detecting method using the ultrasonic technique has been investigated to monitor the insulation ageing of a transformer. However, the result of the studies on the ultrasonic technique for detecting of partial discharge in the operating transformer is not enough yet to utilize. This paper presents the analysis of the ultrasonic signals due to the partial discharge in a model transformer and the corona in air at a shielded high voltage room. In addition, the ultrasonic signals due to the vibration from the core, operation of the cooling pump, the fan and the OLTC at the 345㎸ power transformer, were analyzed and corona noise from overhead transmission line in 345㎸ substation were measured to remove the electrical and mechanical noises from the transformer. Furthermore, ultrasonic signal due to the partial discharge in the 154㎸ power transformer with in $C_2$$H_2$ gas warning condition was measured. The inside of the transformer was examined with care. which confirms the existence of the partial discharge source.