Particle size identification in GIS by ultra high speed measurement of partial discharge

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

doi:10.1109/cmd.2008.4580321

Cited by 5 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…Meanwhile, it is reported that the presence of contaminating particles has long been recognized as a major factor on insulation failure in GIS [1]. Currently, from the viewpoint of maintenance of electric equipment, many attempts have been made to analyze the cause and mechanism of failures by analyzing partial discharges (PD) signals generated by the particles [2,3]. For that, Cook [4] pointed out that the insulation strength triggered by a metallic conducting particle decreases more than 80% in the coaxial electrodes system.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Partial Discharge Detection Techniques under the Condition of Metallic Particle Adhering to Solid Spacer in SF6

Ōkubo

Nishizawa

Okusu

et al. 2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

View full text Add to dashboard Cite

Particle size identification in GIS by ultra high speed measurement of partial discharge

Cited by 5 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

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

Partial Discharge Detection Techniques under the Condition of Metallic Particle Adhering to Solid Spacer in SF6

Contact Info

Product

Resources

About