• Title/Summary/Keyword: Partial discharge detection

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The Application of Pre-Breakdown Partial Discharge Detection Method for Breakdown of Investigation of Long Distance XLPE Cable (장조장 XLPE 케이블 절연 파괴 원인 규명을 위한 전구차단 장치의 응용)

  • Lee, C.Y.;Kim, D.W.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1827-1829
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    • 2002
  • This paper describes AC test for long delivered drum length of cable using pre-breakdown partial discharge detection(PPD) method, which can be applied to observe the causes of electrical breakdown of EHV XLPE insulation. This method is to de-energize applied voltage to cable rapidly using pre-breakdown partial discharge, and is able to prevent complete breakdown. By this effect, defects such as voids, metal particles and protrusion in cable can be observed clearly. AC resonant test set was used for PPD method. Localization of partial discharge was performed by time difference detection of the traveling wave. Accuracy of localization was 1% to the length of test cable. Through several experiments with XLPE cable, successful results of PPD method were obtained.

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The measurement of partial discharge for preventive diagnosis in power machinery (전력용 기기의 예방진단을 위한 부분방전측정)

  • 김태성;구할본;임장섭;정우성
    • Electrical & Electronic Materials
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    • v.7 no.1
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    • pp.42-48
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    • 1994
  • The preventive diagnosis technique for power system is being highlighted as a research area for deterioration of insulation in machinery because of high-voltage power system. We make efforts to develop not only diagnosis of aging state but also detection of defects in the initial stage from preventive diagnosis technique. Especially, partial discharge is actively studied as a non-destructive diagnosis technique and very useful because partial discharge measurement reduces damage than conventional diagnosis technique. The loaded stress during this test is smaller than that of other diagnosis techniques. But the continuous research for various complicated analysis method is required because partial discharge has very small signals and its signals have complex forms. In this paper, the measurement of partial discharge was investigated and studied on many specimens with void. We made samples having artificial voids and measured partial discharge. In order to use as a practical diagnosis technique, we studied ways of measurement, measured illustrations and types of partial discharge which could be used in order to diagnose defects of power machinery.

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A Partial Discharge Diagnostic System for Power Cable Using FBDS(Frequency Band Detection Sensor) (주파수대역 검출센서를 이용한 전력케이블의 부분방전 진단 시스템)

  • Lee, Chul-hee;Choi, Hyung-ki;Hong, Soo-mi;Jeoung, Eui-bung;Park, Kee-Young
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.1
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    • pp.157-163
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    • 2017
  • This system is a diagnosis system that checks whether it causes a partial discharge of a power cable or not. PD(Partial Discharge) is detected by FBDS(Frequency Band Detection Sensor). That is, it means a acoustic sensor capable of detecting each frequency band. The wave shape of PD sound is similar to noise and is systematically generated by partial discharge. Therefore, in this paper, we could discriminate between normal and abnormal case using relative level crossing rate(RLCR) and spectrogram of frequency energy rate.

Patterns of the Ultrasonic Signal caused by Partial Discharge in Transformer (변압기 부분방전에 의한 초음파 신호의 발생형태)

  • 권동진;최인혁;정길조;박찬영;나현석;박재준
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.581-584
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    • 2000
  • Generally, it is known that many partial discharges are occurred in one voltage cycle. In this case, it is not easy to distinguish between ultrasonic signals caused by the partial discharge. We describes a pattern of the ultrasonic signal by the partial discharge in transformer. The test setup for ultrasonic signal measurement was to simulate a internal partial discharge by using a needle to plane electrodes. We compared the number of partial discharge and ultrasonic signal in one voltage cycle. The results showed that it was possible to distinguish between ultrasonic signals by analysing partial discharge detection method and ultrasonic signal on time domain.

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RF front-end Module for On-Line UHF Partial-discharge Monitoring System

  • Lee June Young;Kim Bok Ki
    • Proceedings of the IEEK Conference
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    • 2004.08c
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    • pp.776-779
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    • 2004
  • A RF front-end module is designed for GIS(Gas Insulated Substation) which is employed for effective and efficient very high voltage transmission. Major advantage of the unit is improved PO detection sensitivity through minimizing the effect of surrounding interference signals, which is achieved by controlling the gain and the selection of the frequency band, for the precise detection of any UHF PO (Partial Discharge) disturbance occurred in the GIS due to some unwanted problems. For the development of the module, various switches for providing selected signal paths, wideband LNA, 3 BPF for selecting detection frequency band, and video detector are designed, fabricated and measured on 1 mm FR4 substrate with various RF components. The detection sensitivity of the unit was <-60 dBm that is sufficient to detect UHF PO signals as low as 1 pC. It is believed that the value is enough to detect the signal occurred in GIS.

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Detection of Ultrasonic Signals by PD at the High Voltage Winding (고압권선에서 발생하는 부분방전에 의한 초음파 신호 검출)

  • Kweon, Dong-Jin;Kwak, Hee-Ro;Chung, Sang-Jin;Kim, Han-Sang;Song, Il-Keun;Kim, Kyoung-Wha
    • Proceedings of the KIEE Conference
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    • 1995.11a
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    • pp.456-458
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    • 1995
  • This paper describes a diagnosis of power transformers by on-line detection of ultrasonic signals. Partial discharge in power transformer generates ultrasonic signals. The trend of the ultrasonic signal number can be measured when partial discharge is generated in HV Winding. 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 in the trend analysis of the number of ultrasonic signals caused by partial discharge.

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Acoustic Signal Analysis to Discriminate Partial Discharge Sources (부분방전원에 따른 초음파신호 특성분석)

  • Lee, Y.H.;Park, S.H.;Lee, K.W.;Lee, Y.H.;Kang, S.H.;Lim, K.J.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1691-1693
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    • 2002
  • Acoustic partial discharge detection has been used on GIS testing for more than 10 years. Sensitivities show that most of critical defect types can be detected with a reasonable signal-to-noise ratio. The paper reports on acoustic partial discharge detection comparable to sensitive electrical PD(partial discharge) measuring method.

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The Fundamental Study About Partial Discharge Detection With The Radiated Electromagnetic Wave Characteristics (방사전자파 특성을 이용한 부분방전 검출의 기초연구)

  • Lee, Sang-Hun;Park, Gwang-Seo;Kim, Chung-Nyeon;Lee, Hyeon-Dong;Song, Hyeon-Jik;Kim, Gi-Chae;Lee, Gwang-Sik;Lee, Dong-In
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.7
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    • pp.412-417
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    • 2000
  • This paper offer fundamental materials about Partial Discharge(PD) detection by electromagnetic waves. All spectrum data-usually used as grape- can be used as numbers. And then the average of background noise spectrum strength was made. Average value subtract from every data. Then average value appeared, graphed. The graph was compared with the magnitude of charge. The shape of changes is similar, and the change of electric field strength could be seen in one sight. When the magnitude of charge is over than 100[pC], antenna can detect partial discharge. So this method will be very useful to diagnosis of insulation. It the performance of the antenna used in this experiment is analyzed, good results can be obtained.

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A Study on the Algorithm for Detection of Partial Discharge in G15 Using Wavelet Transform (웨이브렛 변환을 이용한 GIS의 부분방전 검출 알고리즘에 관한 연구)

  • 강진수;김철환
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.52 no.1
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    • pp.25-34
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    • 2003
  • Gas insulated switchgear(GIS) is an important equipment in a substation. It is highly desirable to measure a partial discharge(PD) in GIS which is a symptom before insulation breakdown occurs. The issue is that the PD signal is weak and sensitive to external noise. In this paper, the algorithm for detection of PD in GIS using wavelet transform is proposed. The wavelet transform provides a direct quantitative measure of spectral content, "dynamic spectrum", in the time-frequency domain. The recommended mother wavelet is 'Daubechies' wavelet. 'db4', the most commonly applied mother wavelet in the power quality analysis, can be used most properly in disturbance phenomena which occurs rapidly for a short time. Through the procedure of wavelet transform, noise extraction and reconstruction, the signal is Analyzed to determine the magnitude of PD in GIS. In experimental results, we can know that partial discharge is exactly detected in combination of Dl and D2 using wavelet transform.transform.

Design and Characteristics of AE Sensor for Detection of Metallic particle in GIS (GIS 내의 금속이물 탐지용 AE 센서의 설계와 특성)

  • 홍재일;정영호;류주현
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.6
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    • pp.502-508
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    • 2000
  • In order to detect the partial discharge with the metallic particle in GIS the AE(Acoustic Emission) sensor was designed and simulated by ANSYS 5.5 and manufactured as the coupled vibration mode. The measured resonant frequency and the maximum sensitivity frequency of three coupled AE sensors were as follows ; 147.88 kHz in 8.1mm $\Phi$$\times$8.1mm 128.82 kHz and 58.8 kHz in 9.5 mm$\Phi$$\times$9.5mm, 85.22 kHz and 32.6 kHz in 14.3 mm$\Phi$$\times$14.3 mm, resonant frequency of the AE sensor. The AE sensor of 9.5 mm$\Phi$$\times$9.5mm responded higher than the other coupled vibration mode AE sensor at the partial discharge detection in GIS.

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