• 제목/요약/키워드: Partial Discharge(PD)

검색결과 502건 처리시간 0.042초

음향신호의 유중 전파특성 분석 (Analysis of Propagation Characteristics of Acoustic Signal in Insulation Oil)

  • 윤민영;박경수;왕국명;김선재;길경석
    • 한국전기전자재료학회논문지
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    • 제29권2호
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    • pp.114-119
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    • 2016
  • This paper dealt with the propagation characteristics of acoustic signal in insulation oil for the purpose of improving the reliability of AE (acoustic emission) method used for condition monitoring of oil-immersed transformers. A discharge source was placed in insulation oil and AE sensors ($f_c$ :140 kHz) were attached on the oil tank to study the changes of velocity and propagation path with the depth and distance. The average velocity was 1,436 m/s and the velocity decreased with the increase of depth from the oil surface to 430 mm. The propagation paths were classified into three sections by the shortest reflection path of the detected signal. The minimum distinguishable distance in each section was 70 mm. It was also verified that PD (partial discharge) with a magnitude over than 500 pC can be detected by the AE sensors.

카오스이론을 이용한 GIS 내부 절연결함 판별 (Discrimination of insulation defects in a Gas Insulated Switchgear (GIS) by use of a neural network based on a Chaos Analysis of Partial Discharge(CAPD))

  • 임윤석;이동일;구자윤;김정태;방항권
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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    • pp.2223-2225
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    • 2005
  • In this work, experimental investigation has been mainly done. For this purpose, UHF sensor has been designed and fabricated to detect the partial discharges produced from the 10 artificial defects introduced into the real scale 70kV GIS mock-up under the high voltage at the well shielded room. And also, in order to verify the applicability of the proposed method at the site, the proposed CAPD (chaos analysis of partial discharge) is combined with spectral analysis method in order to identify the nature of the above 10 defects. The PD pattern recognition of each defect has been fulfilled by applying self developed artificial neural network soft ware. The result shows that the recognition rate is reached to be 80% by newly proposed method while the traditional PRPD analysis method leads us to obtain 41%. In consequence, it can be pointed out that the proposed method seems likely to be applicable to the real GIS at the site.

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GIS에서 UHF 부분방전 검출법의 교정방안 연구 (The Study of The Calibration Method for The UHF PD Detection in GIS)

  • 이우영;정진교;최영길
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 E
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    • pp.2290-2292
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    • 1999
  • The Ultra-High Frequency(UHF) method for detecting a partial discharge in Gas-Insulated Substation(GIS) has some advantages compared to a conventional method(IEC 270) but there is a shortage in view of a quantitative analysis. Therefore, this paper describes the implementation of a calibrator and the calibration process based on it. And its characteristics are confirmed through the experiment using the 362kV GIS chamber.

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ANFIS 분류기법을 이용한 부분방전원의 분류 (PD classification by using ANFIS method)

  • 박성희;윤재훈;김병철;임기조;강성화
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.467-467
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    • 2007
  • Solid insulation exposed to voltage is degraded by electrical tree process. And the degradation of the insulation is accelerated by voltage application. For this experimental, specimen of electrical tree model is made by XLPE (cross-linked polyethylene). And the size of the specimen is $7^*5^*7mm^3$. Distance between needle and plane is 2 mm. Voltages applied to acceleration test are ranged 12 to 15 kV. And distribution characteristic of degraded stage is studied too. By PD detecting and data processing, discharge data was acquired from PD detecting system (Biddle instrument). The system presents statistical distribution of phase resolved. Moreover, the processing time of electrical tree is recorded to know the speed of degradation according to voltage. Finally, it's used PD classification by ANFIS method.

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전기트리시 발생하는 부분방전원 분류기법 비교 분석 (Comparing and Analysis for Classification of PD Source Generated by Electrical Tree)

  • 윤재훈;김병철;강성화;정수현;임기조
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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    • pp.464-465
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    • 2007
  • Solid insulation exposed to voltage is degraded by electrical tree process. And the degradation of the insulation is accelerated by voltage application. For this experimental, specimen of electrical tree model is made by XLPE (cross-linked polyethylene). And the size of the specimen is $7*5*7\;mm^3$. Distance of needle and plane is 2 mm. Voltages applied for acceleration test are 12 kV to 15 kV. And distribution characteristic of degraded stage is studied too. As a PD detecting and data process, discharge data acquire from PD detecting system (Biddle instrument). The system presents statistical distribution as phase resolved. Moreover the processing time of electrical tree is recorded to know the speed of degradation according to voltage.

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에폭시-나노콤포지트의 부분방전 저항성 특성연구 (Partial Discharge Resistance of Epoxy-Nanocomposites)

  • 박재준;이창훈;최태진;최태일;박용범;이성일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.1375_1377
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    • 2009
  • PD의 저항성은 에폭시원형을 포함한 3종류 즉, 에폭시 마이크로 콤포지트를 실란처리 및 미처리한 경우 그리고 나노-마이크로입자가 혼합된 콤포지트의 부분방전저항성을 연구하였다. 이들 재료들은 rod - gap - plane 전극 하에서 PD가 적용되었다. 원형에폭시수지보다 마이크로 콤포지트가 부분방전저항성이 우월하였다. 더욱이 SiO2 나노입자-마이크로 혼합된 콤포지트가 더욱더 큰 저항성을 얻었다. 이는 마이크로 입자사이로 나노입자가 치밀한 조직을 갖고 있기에 이러 우월한 특성을 나타낸 것으로 판단된다.

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DC 변전소 몰드변압기 온라인 상태 감시 시스템 구현 (Implementation of a Condition Monitoring System for Mold Transformers in DC Substations)

  • 박영;정호성;박철민;장순호
    • 전기학회논문지
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    • 제60권9호
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    • pp.1788-1794
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    • 2011
  • The mold transformer is a complex and critical component of DC substations in Metro system. In this paper, a cost effective and intelligent condition monitoring system for mold transformers in DC substations was developed. This paper also provides an overview of the management program using PD (partial discharge) data on mold transformers. Prior to application of the proposed system to Metro DC substations, experiments were performed at the metro line substation located in Seoul and presented case studies for the use of the intelligent condition monitoring system for mold transformer in DC substations. The experiment results indicated that the developing system can be need in helping mange the risk of unexpected failure of mold type transformers.

광섬유 센서를 이용한 초음파 검출 (A Fiber-Optic Sensor for Ultrasonic Measurement)

  • 심승환;이광식;이동인;이상훈;김달우
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 C
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    • pp.1715-1717
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    • 2001
  • The partial-discharge(PD) is accompanied by physical and chemical phenomena, such as heat, light, noise gas, chemical transformation, electric current, and electromagnetic radiation. The PD can be detected by measuring one of these changes. Although some techniques are employed in this purpose, several obstacles interfere with an on-line measurement. Now, a fiber-optic sensor for detecting ultrasonics is suggested for the on line measurement system with high accuracy. This paper describes the basic principles fiber-optic sensor for ultrasonic measurement.

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공기 및 복합유전체 갭에서의 방사전자파의 거리 및 편파특성 (The distance and polarization characteristics of electromagnetic wave radiated at needle-to-plane electrodes in Air and complex dielectric)

  • 김충년;이현동;박광서;박원주;이광식;이동인;이동헌
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2000년도 학술대회논문집
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    • pp.241-245
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    • 2000
  • In this paper, VHF(30~230[MHz]) electromagnetic waves radiated from partial discharge(PD) at two-type electrodes in air are measured and the peculiar patterns of their spectra are reported. Also, the polarization and distance characteristics of electromagnetic wave rediated by PD, were investigated. In case of epoxy insulator in inserted, the noise level of radiated electromagnetic waves is 0.6~6.2[dB] higher than the case in air at below 90[MHz]. The frequency spectrum distribution of radiated electromagnetic waves appears different in the whole frequency range according to the arrangement of antenna.

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Short Time Fourier Transform을 이용한 공기중 부분방전원 식별 (Discrimination of PD sources in air using Short Time Fourier Transform)

  • 이강원;장동욱;이용희;박성희;강성화;임기조
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 C
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    • pp.1871-1873
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    • 2002
  • Partial Discharge is radiated in the form of electromagnetic wave from variable sources. It can be taken by UHF antenna and the signal pulse from that has a nonstationary time-series which can be evaluated with several methods. One of them is STFT(short time fourier transform) processed in frequency region. Statistical results using STFT show the possibility being able to discriminate between several PD sources.

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