Influence of accumulated surface charges on partial discharge activity at micro gap delamination in epoxy GIS spacer

Mansour, Diaa‐Eldin A.; Kojima, H.; Hayakawa, Naoki; Endo, Fumio; Ōkubo, H.

doi:10.1109/icpadm.2009.5252341

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…As evident from these figures, the time transition of PD generation rate exhibits different tendencies for negative and positive PD pulses and the higher the over voltage ratio against PDIV, the larger the generation rate of positive PD pulses to the negative PD pulses. Similar tendencies in time transition of PD generation rate are obtained for higher applied voltages [10]. For the metallic particle defect, the electric field distribution is first calculated around the tip of each size of metallic particles as shown in Figure 7.…”

Section: Time Transition Of Partial Discharge Characteristicsmentioning

confidence: 79%

Charge accumulation effects on time transition of partial discharge activity at GIS spacer defects

Mansour

Nishizawa

Kojima

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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The partial discharge (PD) measurements are considered as the most important tool for condition monitoring of Gas Insulated Switchgears (GISs). However, if spacer surface is involved in PD activity, charge accumulation process greatly affects the time transition of PD characteristics. This paper investigates this effect considering the defect types of delamination at the electrode/spacer interface and metallic particles adhered to the spacer surface as the most serious defects that can lead to major failure. Two different electrode configurations were built to simulate the two defect types. The PD characteristics were measured and analyzed from immediately after voltage application up to several minutes where steady state characteristics have been obtained. As a result, it was found that the generation rate of PD pulses changed considerably with time for both defect types. This tendency of PD characteristics has been discussed considering the effect of charge accumulation. Comparing these effects for negative and positive PD enabled to clarify the similarities and differences in the charge accumulation effect for both defect types which can contribute to the defect type identification in GIS. It was found that the effects of charge accumulation on the electric field strength for the delamination defect case as well as on the ionization volume for the metallic particle case were the responsible parameters for the different PD tendencies.

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Section: Time Transition Of Partial Discharge Characteristicsmentioning

confidence: 79%

Charge accumulation effects on time transition of partial discharge activity at GIS spacer defects

Mansour

Nishizawa

Kojima

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

Self Cite

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show abstract

“…Nevertheless, some unavoidable insulation defects may occur inside the GIS during manufacturing, assembling and operation. Among these defects, the defects at the surface of the epoxy spacer are considered as the critical ones because they can cause flashovers and consequently GIS faults under AC stress [3][4][5]. The flashover at the spacer surface is usually preceded by partial discharge (PD) activity in the vicinity of the insulation defect.…”

Section: Introductionmentioning

confidence: 99%

Study on the combined characteristics of UHF and optical signals induced by partial discharge at spacer surface in GIS

Han

Guo

Shen

et al. 2020

IET Generation, Transmission & Distribution

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Partial discharge detection at delamination of electrode/epoxy interface in GIS spacers

Mansour

Kojima

Hayakawa

et al. 2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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Influence of accumulated surface charges on partial discharge activity at micro gap delamination in epoxy GIS spacer

Cited by 7 publications

References 5 publications

Charge accumulation effects on time transition of partial discharge activity at GIS spacer defects

Charge accumulation effects on time transition of partial discharge activity at GIS spacer defects

Study on the combined characteristics of UHF and optical signals induced by partial discharge at spacer surface in GIS

Partial discharge detection at delamination of electrode/epoxy interface in GIS spacers

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