Fundamental differences of the PD measurement according to IEC 60270 and in UHF range

Hoek, S.M.; Coenen, Sebastian; Bornowski, Markus; Tenbohlen, Stefan

doi:10.1109/cmd.2008.4580234

Cited by 14 publications

(14 citation statements)

References 1 publication

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“…This result coincides with the results of [11]. Protrusion was removed and the same chamber tested for PD and now PD value obtained was less than 1pC, confirming the presence of protrusion in a GIS HV conductor by literature and experimentation.…”

Section: A Protrusion On Hv Conductorsupporting

confidence: 89%

“…But PD signal was initiated at positive half cycle. These results coincide with the result of [11]. So protrusion was removed and tested for PD and PD value obtained was less than 1pC.…”

Section: B Protrusion On Enclosuresupporting

confidence: 86%

“…Fig 3 shows the PRPD pattern for HV conductor defect. The positive half wave of the high voltage corresponds to the positive phase, and the negative one to the negative phase [11]. The PD signals arriving from the defects are amplified and showed on the ICM compact PD monitor for electrical method and FSH4 spectrum analyzer for UHF method.…”

Section: A Protrusion On Hv Conductormentioning

confidence: 99%

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Analysis of partial discharge signals in 420 kv gas insulated substation

Prabakaran

Usa

Kumar³

2013

2013 IEEE 1st International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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Gas insulated substation (GIS) reliability has been proven for more than forty years, yet some failures has been reported. Some of the failures are due to the presence of metallic and non metallic particles inside the GIS compartment. The defect can be generated in GIS during production, maintenance, installation and due to ageing of the component. The particle can give rise to field nonuniformities, which can reduce the breakdown strength. Proven technique to assess GIS insulation condition is partial discharge measurement in GIS. Hence for proper assessment of the failure it is necessary to have a good understanding of the partial discharge (PD) patterns. This paper identifies PD patterns for different defect using electrical and UHF method. As insulation failure usually starts with PD activity, this paper investigates the differences in PD characteristics in SF 6 gas with different types of defects using electrical and UHF method. A series of tests has been done to establish a correlation between partial discharge as well as the applied voltage for different defects. Experimental results show that correct identification of defects can be achieved based on considered PD characteristics.Keywords-Gas insulated substation (GIS), Partial discharge (PD), artificial defects, conventional method, Ultra high frequency (UHF) method.I.

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Section: A Protrusion On Hv Conductorsupporting

confidence: 89%

“…But PD signal was initiated at positive half cycle. These results coincide with the result of [11]. So protrusion was removed and tested for PD and PD value obtained was less than 1pC.…”

Section: B Protrusion On Enclosuresupporting

confidence: 86%

Section: A Protrusion On Hv Conductormentioning

confidence: 99%

See 1 more Smart Citation

Analysis of partial discharge signals in 420 kv gas insulated substation

Prabakaran

Usa

Kumar³

2013

2013 IEEE 1st International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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“…Another feature of the UHF method is its ability to provide a precise trigger signal for acoustical PD localization. Since the introduction of UHF PD measurements on transformers it has been seen as a major disadvantage that UHF measurements cannot be calibrated in terms of PD charge magnitudes [8]. But for a risk analysis under on-site conditions the apparent charge value of a PD activity is of subordinated importance compared to PD type identification (pattern recognition) and the exact location of the fault.…”

Section: Introductionmentioning

confidence: 99%

Application of the UHF technology to detect and locate partial discharges in liquid immersed transformer

Hoek

Krüger

Körber³

et al. 2014

Elektrotech. Inftech.

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The paper explains theoretical aspects of PD signal propagation in the UHF range inside a transformer. The influences of inner structures inside the transformer and the sensor characteristics on UHF measurement results are discussed. Based on practical examples measured on transformers ranging from 100 MVA to more than 1000 MVA the sensitivity of UHF measurements is described with respect to the measurement frequency used and the propagation path between PD spot and UHF sensor. Another discussed aspect is a comparison of PD pattern recorded with a UHF system and pattern of the same fault acquired by conventional PD equipment.The application of UHF signals triggering an acoustical PD localization system is shown. Found limitations of the UHF method are discussed, too.Finally, an outlook on foreseeable evolutions and developments in the field of UHF PD detection, measurement and monitoring is given.

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“…This can be used to discriminate between them during on-site and on-line measurements by choosing a suitable measurement frequency or by combining the conventional and the UHF technique. However, there are general uncertainties related to the comparability of the UHF measurements to conventional IEC conformant tests [7]. For example, during CIGRÉ Session 2008 the Special Reporter of Study Committee D1 asked the question: "How can the relation between the conventional PD measurement and the UHF measurement be determined and generalized?"…”

Section: Introductionmentioning

confidence: 99%

Untitled

2012

ijeei

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Partial Discharge measurements are considered as a powerful technique for testing and monitoring the condition of high-voltage insulations sinceit serves as an early breakdown indicator. In the present contribution, the authors describe the fundamentally different propagation mechanisms of electrical impulses in the conventional measurement frequency range according IEC 60270 and in the ultra-high frequency range. Electromagnetic field simulation and measurements in GIS are used to elaborate the signal propagation mechanisms. The low-frequency components of the PD signals propagate mainly via the conductor, whereas the high-frequency components (UHF signals) are radiated as electromagnetic waves. The sensitivity and spectrum of the measurement depends strongly on the geometric position of the PD, damping and resonances of the propagation path, and the frequency response of the receiver. Due to their different, complex propagation mechanisms, apparent charge level after IEC 60270 and UHF antenna peak voltage cannot be compared directly nor can frequency spectra be easily used for deriving information about the physical nature of the defect.

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Fundamental differences of the PD measurement according to IEC 60270 and in UHF range

Cited by 14 publications

References 1 publication

Analysis of partial discharge signals in 420 kv gas insulated substation

Analysis of partial discharge signals in 420 kv gas insulated substation

Application of the UHF technology to detect and locate partial discharges in liquid immersed transformer

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