• Title/Summary/Keyword: UHF PD

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A study on the UHF PD measuring technique for GIS with a metal flange around insulating spacer (스페이서에 Metal flange가 있는 GIS에서의 UHF PD 측정 기술 연구)

  • Kang, W.J.;Lee, C.J.;Kang, Y.S.;Park, J.B.;Lee, H.C.;Park, J.W.
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1638-1640
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    • 2003
  • In the recent years, UHF PD measuring technique for detecting partial discharges was proved the effective method for Gas Insulated Switchgear (GIS). However, in case of GIS with a metal flange around insulating spacer, UHF PD measurement using typical external UHF PD sensor is difficult. In this paper, a novel hole-type UHF PD sensor based on Archimedean spiral antenna theory has been proposed and realized. All spacers with metal flange have small hole in order to inject epoxy. Using the novel hole-type UHF PD sensor, it makes detection possible to PD signal that are emitted through the epoxy injection hole. Additionally, the measuring characteristic of UHF PD signals from several artificial defects in GIS and the novel ${\Phi}$-f-q pattern analysis technology are discussed.

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Signal Characteristics of Ultra-high Frequency Radiation from Partial Discharge in Insulation Oil (절연유에서 부분방전에 의한 극초단파 신호 특성분석)

  • Ju, Hyoung-Jun;Goo, Sun-Geun;Park, Ki-Jun;Han, Ki-Seun;Yoon, Jin-Yul
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.1
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    • pp.56-59
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    • 2008
  • We have designed 4 types(void in insulation paper, protrusion electrode, floating electrode, surface discharge) of partial discharge(PD) defect to simulate typical faults found in oil filled power transformers. Ultra-high frequency(UHF) radiation due to PD was measured using a UHF measuring system and a conventional PD measuring system, simultaneously. Electromagnetic radiation spectra of these defects show UHF radiation up to about 1.5-2 GHz range. The phase resolved partial discharge(PRPD) patterns of UHF radiation from the PD defects were also measured and the pattern reveals distinct feature for each defect types. The UHF measuring could be used to detect PDs in oil filled transformers and analysis of the PRPD pattern should provide useful information on origin of PD signal.

A Novel Sensitivity Verification Method for the UHF Partial Discharge Detection System in Gas Insulated Switchgear (GIS) (가스절연개폐장치용 UHF 부분방전검출장치의 새로운 감도 측정방법)

  • Gu, Seon-Geun;Park, Gi-Jun;Yun, Jin-Yeol
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.9
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    • pp.450-455
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    • 2001
  • We proposed a new sensitivity verification method for the UHF partial discharge(PD) detection system. Initially, we measure the UHF power induced by 5 pC PD which takes place near UHF sensor. Subsequently, we inject the swept UHF signal from a network analyzer into the GIS and measure the attenuation of the signal along the 71S Both the UHF power by 5 pC PD and the attenuation make it possible to verify the sensitivity and spatial coverage of the PD detection system. This method doesn\`t require the calibration of injected pulse type UHF signal into the GIS and makes us precisely measure the attenuation in frequency domain.

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GlSPD Analysis Using UHF Dual-Band Method (UHF 이중대역법을 이용한 GIS PD 분석)

  • Yi, Sang-Hwa;Choi, Jae-Gu;Kim, Kwang-Hwa
    • Proceedings of the KIEE Conference
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    • 2004.11d
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    • pp.63-66
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    • 2004
  • It is widely known that the ultra high frequency (UHF) method that detects the electromagnetic wave of the PD pulses in the gas insulated space is one of the most competitive methods for its high sensitivity. From the above point of view, this paper describes the characteristics of GIS PD signals measured with ultra wide band (UWB) GIS PD defecting system in which PD signals are defected into the dual UHF band. Thc UWB PD detection system consists of the UWB UHF coupler, the UWB low noise amplifier (LNA) and the oscilloscope. The dual bands for PD signals are 0.5-2GHz(full band) and 1-2GHz(high band). As results, it was found that the partial discharges of each defect have their own characteristic pattern and the ratio of High hand to Full band increases with gas pressure.

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On-line PD Monitoring Using UHF Technique (UHF 가술을 이용한 온라인 PD 모니터링)

  • Choi, Yong-Sung;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.04c
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    • pp.115-118
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    • 2008
  • A field-oriented UHF system for on-line PD monitoring of transformers. is designed, which has been installed inside the oil tank of a transformer 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 successfully captured long intermittent discharge signals that hadn't been detected through conventional techniques, and solved the problem successfully. The results demonstrate that UHF technique has great advantages for on-line PD monitoring of transformers. By adopting the peak detection technique, it becomes easy and effective for the transplantation of the phase-resolved pattern recognition technique from conventional method to UHF method, and then to realize continuous on-line monitoring, source characterization and trending analysis.

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GISPD Analysis Using UHF Dual-Band Method (UHF이중대역법을 이용한 GISPD분석)

  • Kim, Kwang-Hwa;Yi, Sang-Hwa;Choi, Jae-Gu
    • Proceedings of the KIEE Conference
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    • 2004.07c
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    • pp.1860-1862
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    • 2004
  • It is widely known that the ultra high frequency (UHF) method that detects the electromagnetic wave of the PD pulses in the gas insulated space is one of the most competitive methods for its high sensitivity. From the above point of view, this paper describes the characteristics of GIS PD signals measured with ultra wide band (UWB) GIS PD detecting system in which PD signals are detected into the dual UHF band. The UWB PD detection system consists of the UWB UHF coupler, the UWB low noise amplifier (LNA) and the oscilloscope. The dual bands for PD signals are 0.5-2GHz(full band) and 1-2GHz(high band). As results, it was found that the partial discharges of each defect have their own characteristic pattern and the ratio of High band to Full band increases with gas pressure.

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Ultra-wide bandwidth versus narrow bandwidth PD detection techniques for UHF partial discharge monitoring system (초광대역과 단일주파수(협대역) UHF 부분방전 검출기법 비교)

  • Park, Ki-Jun;Goo, Sun-Geun;Yoon, Jin-Yul
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1655-1657
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    • 2002
  • Ultra-wide bandwidth (UWB), narrow bandwidth (single frequency), and a combination of both technologies have been studied for the ultra-high frequency (UHF) partial discharge (PD) monitoring system as a detection scheme. We have experimentally compared those detection methods using a mock-up of 362 kV class single phase gas-insulated switchgear (GIS) and a stable PD source. A rolling-ball type PD cell that produces PDs of about 10 pC, is placed at one end of the GIS. An internal UHF PD sensor was attached several meters away from the PD source. The PD spectrum was measured up to 3 GHz. A useable bandwidth of more than 1 GHz was used to measure UWB signals from the PD. To simulate the narrow bandwidth scheme a bandwidth of 100 kHz centered at several different frequencies was used.

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Propagation Characteristics of GIS PD Signals by Dual UHF Band Method (2)

  • Choi, Jae-Gu;Yi, Sang-Hwa;Kim, Kwang-Hwa
    • Proceedings of the KIEE Conference
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    • 2004.05b
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    • pp.136-139
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    • 2004
  • It is widely known that the ultra high frequency (UHF) method that detects the electromagnetic wave of the PD pulses in the gas insulated space is one of the most competitive methods for its high sensitivity. From the above point of view, this paper describes the propagation characteristics of GIS PD signals measured with ultra wide band (UWB) GIS PD detecting system in which PD signals are detected into the dual UHF band. The UWB PD detection system consists of the UWB UHF coupler, the UWB low noise amplifier (LNA) and the oscilloscope. The dual bands for PD signals are 0.5-2GHz(full band) and 1-2GHz(high band). As results, propagation characteristics of GIS PD signals were measured in the mock-up GIS bus and it was found that the propagation characteristics of the high band showed a better result in accordance with the infernal configuration of the GIS bus than those of the full band.

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

  • Oh, Yong;Choi, Yong-Sung;Hwang, Jong-Sun;Lee, Kyung-Sup
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.2
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    • pp.176-180
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    • 2008
  • 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 successfully captured long intermittent discharge signals that hadn't been detected through conventional techniques, and solved the problem successfully. The results demonstrate that UHF technique has great advantages for on-line PD monitoring of transformers. By adopting the peak detection technique, it becomes easy and effective for the transplantation of the phase-resolved pattern recognition technique from conventional method to UHF method, and then to realize continuous on-line monitoring, source characterization and trending analysis.

PD Monitoring of Transformer Using UHF Technique (UHF 기술을 응용한 전력용 변압기의 PD 모니터링)

  • Choi, Yong-Sung;Hwang, Jong-Sun;Lee, Kyung-Sup
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.2116-2117
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    • 2008
  • This system has successfully captured long intermittent discharge signals that hadn't been detected through conventional techniques, and solved the problem successfully. The results demonstrate that UHF technique has great advantages for on-line PD monitoring of transformers. By adopting the peak detection technique, it becomes easy and effective for the transplantation of the phase-resolved pattern recognition technique from conventional method to UHF method, and then to realize continuous on-line monitoring, source characterization and trending analysis.

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