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UHF 기술을 이용한 온라인 부분방전 모니터링
On-line Insulation Diagnostic by PD Monitoring Field Practical of UHF Technique for On-line PD Monitoring 원문보기

전기학회논문지. The Transactions of the Korean Institute of Electrical Engineers. P, v.57 no.2, 2008년, pp.176 - 180  

오용 (동신대학교 전기전자공학과) ,  최용성 (동신대학교 전기공학과) ,  황종선 (전남도립대학 컴퓨터응용전기과) ,  이경섭 (동신대학교 전기공학과)

Abstract ▼ AI-Helper 아이콘AI-Helper

A field-oriented UHF system for on-line PD monitoring of transformers is designed, which has been installed inside the oil tank of transformer in a substation by two ways: on-line installing mode through the oil-valve and pre-installing mode through the man hole/hand hole cover. This system has succ...

주제어

#Power Transformer   #On-line Monitoring   #Partial Discharge   #UHF   #Field Test  

AI 본문요약
AI-Helper 아이콘 AI-Helper

* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

제안 방법

  • A stable and continual signal was found and recorded by the oscilloscope, see Figure 3. In order to find out its source, several layers of aluminum foil was wrapped onto the apertures at where the flange joints and all the signal lines were screened by a soft spiral iron pipe, which intention is to ensure good screening of the whole measuring system. After convinced that the interferences could be totally removed by the screening, we found that the signal still exists, then the sensor was withdrawn out of the transformer, still the signal existed, so we concluded that the signals are interferences brought about by the switched power of the amplifier.
  • The stationary device will be installed on the equipment during its service life, and its main functions are: continuously mordtoring the target, then decide whether there're PD or not; making phase-resolved statistical analysis of the UHF peak detection signals to plot charts, which is to make source characterization; recording important PD parameters and making trending analysis. The stationary part provides reserved port for the movable device to be connected in.
  • The system includes two main parts: the stationary continuous-working equipment that deals with the UHF peak detection signals, and the movable instrument that analyzes the original UHF signals in time domain as well as frequency domain. The stationary equipment is a self-developed industrial PC system, which is made up of a fast DAQ card and real-time analyzing software.
  • This paper adopts the peak detection technique in the field-oriented UHF on-line PD monitoring system of transformers, then the two practical working instances are introduced in detail, the results indicate the effectiveness of the UHF technique and ths superiority over conventional methods.

대상 데이터

  • The hardware components mainly consist of UHF sensor, UWB amplifier with peak detection module, RG142AJ cables, high-speed DAQ card, IPC and digital oscilloscope, the bandwidth ranges from 400M - 1500M Hz. UHF sensor is a self-compensative Archimedes antenna fed by a 50Q coaxial cable, which is matched through a 4-1 wide band ferrite-core transformer.
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참고문헌 (14)

  1. Okubo H, Suzuki, "A Frequency component of current pulse waveform in partial discharge measurement", 9th ISH [C] Graz, August 25-29, 1995 

  2. M.D. Judd, O. Farish, B.F. Hampton, "Broadband couplers for UHF detection of partial discharge in gas-insulated substations", IEE Proc. Sci. Meas. Technol., pp. 237-243, Vo1.142, No.3 May 1995 

    상세보기 crossref

  3. M.D. Judd, "Transient calibration of electric field sensors, Science, Measurement and Technology", IEE Proceedings, Volume: 146 Issue: 3, Pagers): 113, 116, May 1999 

  4. M.D. Judd, O. Farish, "A pulsed GTEM system for UHF sensor calibration", IEEE Trans. Instrumentation and Measurement, Vol. 47, no. 4, pp.875-880, August 1998 

    상세보기 crossref

  5. M.D. Judd, O. Farish, J.S. Pearson, "UHF couplers for gas-insulated substations: a calibration technique, Science, Measurement and Technology", IEE Proceedings, Volume: 144 Issue: 3, Pagels): 117 -122, May 1997 

  6. M. Knapp, R. Feger, K. Feser, A Breuer, "Application of the CIGRE-sensitivity verification for UHF PD detection in three-phase GIS, High Voltage Engineering Symposium", 22-27, Conference Publication No. 467, IEE, 1999 

  7. L. Yang, MD. Judd, "Propagation characteristics of UHF signals in transformers for locating partial discharge sources", Proc. 13th Int. Symposium on High Voltage Engineering (ISH), Delft, 2003 

  8. A.R. Convery, M.D. Judd, "Measurement of Propagation characteristics for UHF signals in transformer insulation materials", Proc. 13th Int. Symposium on High Voltage Engineering (ISH), Delft, 2003 

  9. W.R. Rutgers and Y.H. Fu, "UHF PD-Detection in a power transformer", 10th International Symposium on High Voltage Engineering, pp. 219-222, August 25-29, 1997 

  10. M.D. Judd, O. Farish, and B.F. Hampton, "The Excitation of UHF signals by partial discharges in GIS", IEEE Trans. Dielect. Elect. Insulation, Vol.3, pp. 213-228, Apr. 1996 

    상세보기 crossref

  11. Judd, M.D., Hampton, B.F., Farish, O., "Modeling partial discharge excitation of UHF signals inwaveguide structures using Green's functions", Science, Measurement and Technology, IEE Proceedings-, Volume: 143 Issue: 1, Pagers): 63 -70, Jan. 1996 

  12. M.D. Judd, "Using finite difference time domain techniques to model electrical discharge phenomena" , Electrical Insulation and Dielectric Phenomena, 2000 Annual Report Conference on, Volume: 2, Pagels): 622 -625 Vol.2, Oct. 2000 

  13. Xu Gaofeng et al, "A Calculational Method of transient electric field excited by partial discharge in gas insulated substation using Dyadic Green Function", Power System Technology, 2002. Proceedings. PowerCon 2002. International Conference on , Volume: 3, Pagers): 1438 -1441, Vol.3, Oct. 2002 

  14. Raja, K., Devaux, F., Lelaidier, S., "Recognition of discharge sources using UHF PD signatures", Electrical Insulation Magazine, IEEE , Volume: 18 Issue: 5, pp: 8 -14, Sept. -Oct. 2002 

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