• 제목/요약/키워드: Partial discharge detection

검색결과 196건 처리시간 0.029초

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

  • 이창영;김동욱
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 C
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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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전력용 기기의 예방진단을 위한 부분방전측정 (The measurement of partial discharge for preventive diagnosis in power machinery)

  • 김태성;구할본;임장섭;정우성
    • E2M - 전기 전자와 첨단 소재
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    • 제7권1호
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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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주파수대역 검출센서를 이용한 전력케이블의 부분방전 진단 시스템 (A Partial Discharge Diagnostic System for Power Cable Using FBDS(Frequency Band Detection Sensor))

  • 이철희;최형기;홍수미;정의붕;박기영
    • 전자공학회논문지
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    • 제54권1호
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    • pp.157-163
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    • 2017
  • 본 논문은 주파수대역검출센서(FBDS)를 이용하여 전력 케이블에서 부분방전(PD)가 발생했을 때 이것을 검출하고 진단하는 시스템 개발에 관한 논문이다. 주파수대역검출센서는 각 주파수대역에서 발생하는 부분방전을 음향학적으로 변환하여 검출한다. 부분방전은 그 음향학적 신호 형태로 잡음과 유사하다. 따라서 본 논문에서 상대적 레벨교차율(RLCR)과 주파수에너지 스펙트럼을 이용하여 정상과 비정상을 구별하여 부분방전을 검출하였다.

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

  • 권동진;최인혁;정길조;박찬영;나현석;박재준
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2000년도 하계학술대회 논문집
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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
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2004년도 학술대회지
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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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고압권선에서 발생하는 부분방전에 의한 초음파 신호 검출 (Detection of Ultrasonic Signals by PD at the High Voltage Winding)

  • 권동진;곽희로;정상진;김한상;송일근;김경화
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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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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부분방전원에 따른 초음파신호 특성분석 (Acoustic Signal Analysis to Discriminate Partial Discharge Sources)

  • 이용희;박성희;이강원;이용희;강성화;임기조
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 C
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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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방사전자파 특성을 이용한 부분방전 검출의 기초연구 (The Fundamental Study About Partial Discharge Detection With The Radiated Electromagnetic Wave Characteristics)

  • 이상훈;박광서;김충년;이현동;송현직;김기채;이광식;이동인
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제49권7호
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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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웨이브렛 변환을 이용한 GIS의 부분방전 검출 알고리즘에 관한 연구 (A Study on the Algorithm for Detection of Partial Discharge in G15 Using Wavelet Transform)

  • 강진수;김철환
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제52권1호
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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.

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

  • 홍재일;정영호;류주현
    • 한국전기전자재료학회논문지
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    • 제13권6호
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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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