Dependence of partial discharge characteristics at spacer surface on particle size in SF&lt;inf&gt;6&lt;/inf&gt; gas insulated system

Hayakawa, Naoki; Okusu, T.; Nishizawa, Kunihide; Kojima, H.; Endo, Fumio; Yoshida, Masanobu; Uchida, Kôji; Ōkubo, H.

doi:10.1109/cmd.2008.4580227

Cited by 15 publications

(4 citation statements)

References 6 publications

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“…Then, the PD become stable. PD characteristics are greatly influenced by the duration of the applied voltage, as was also seen in the present experiments [5].…”

Section: Discussionsupporting

confidence: 67%

Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage

Danikas¹,

Zhao²,

Cheng³

2011

Journal of Electrical Engineering

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In this paper, some results are presented on experiments concerning partial discharges (PD) behavior of epoxy resin samples. The main idea is to see whether a sample with PD at its inception voltage, still presents some tendency to charging effects below inception. An effort is being made to relate the present work with previous publications on the same main idea. The experiment arrangement is three layers of epoxy resin with a void in middle layer. Different level voltages under inception voltage are applied to the arrangement and different PD waves are registered under different level voltages. To make sure that the tendency to charging effects below inception, infrared spectrum analysis is also conducted and the result is content to clarify our objective.

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“…Then, the PD become stable. PD characteristics are greatly influenced by the duration of the applied voltage, as was also seen in the present experiments [5].…”

Section: Discussionsupporting

confidence: 67%

Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage

Danikas¹,

Zhao²,

Cheng³

2011

Journal of Electrical Engineering

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“…Partial discharge (PD) measurement is usually used for this purpose [2]. In particular, PD measurements have been investigated for identification of defect type and size in GIS [3,4]. Generally, PD inception and propagation characteristics are changed by the local electric field at defects.…”

Section: Introductionmentioning

confidence: 99%

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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“…PDIV characteristics in lower and upper electrodes' surface show the similar tendency and it decreases depending on increase of the particle length. Hayakawa [11] pointed out that PDIV is dominated by the electric field intensity near the metallic particle tip and the longer the particle length L, the higher the electric field intensity near the metallic particle tip is. Figure 10.…”

Section: Particle Fixed On the Upper Electrodementioning

confidence: 99%

Partial Discharges Characteristics of Harmful Conducting Particles Around Spacer Under AC Voltage in Atmospheric Air

Tan

Zhang

Jia

et al. 2009

2009 Asia-Pacific Power and Energy Engineering Conference

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Harmful metallic particles inside gas insulated switchgears (GISs), which are the most problematic among various defects in a GIS, is significant to the reliable operation of such electric equipment in power transmission network. This paper investigates, on an experimental basis, the partial discharge (PD) characteristics initiated from particles under ac voltage in atmospheric air with those placed freely on the lower electrode's surface of GIS model, having adhered to the insulated spacer's surface, and fixed on the upper electrode's surface, respectively. PD and breakdown characteristics in terms of the particle size (length and radius) and the location between the spacer and the particle have been studied in detail. All results are compared with each other to clarify the influence of the particle geometry size and location on PD characteristics. The amount of PD pulses in unit time, which shows the severe extent in PD, has been also investigated. The influence mechanism of the particle location on PD characteristics is discussed in this paper.

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Dependence of partial discharge characteristics at spacer surface on particle size in SF<inf>6</inf> gas insulated system

Cited by 15 publications

References 6 publications

Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage

Experimental Data on Epoxy Resin Samples: Small Partial Discharges at Inception Voltage and Some Thoughts on the Possibility of the Existence of Charging Phenomena Below Inception Voltage

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

Partial Discharges Characteristics of Harmful Conducting Particles Around Spacer Under AC Voltage in Atmospheric Air

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