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

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

doi:10.1109/ceidp.2008.4772822

Cited by 12 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in inverse to the delamination defect case, the time transition of PD generation rate exhibits similar tendencies for negative and positive PD pulses. These tendencies are also confirmed for longer particles [11].…”

Section: Time Transition Of Partial Discharge Characteristicssupporting

confidence: 72%

“…For the delamination defect, this is proved from the change in PD inception electric field until a steady state characteristics have been obtained when a balance between charge accumulation and charge neutralization occurs [12]. For the metallic particle defect, the development of accumulated charges is confirmed from the surface potential measurements after 1 minute and 10 minutes of voltage application [11].…”

Section: Distribution Of Accumulated Surface Chargesmentioning

confidence: 99%

See 1 more Smart Citation

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

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: Time Transition Of Partial Discharge Characteristicssupporting

confidence: 72%

Section: Distribution Of Accumulated Surface Chargesmentioning

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.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The spacer length and the applied voltage values used in the test setup were selected so that the average electric field along the spacer surface was in the range of 2-2.5 kV rms /mm. This range of average electric field is normally used in the practical GIS [5].…”

Section: Experimental Arrangementmentioning

confidence: 99%

“…Due to electrostatic charging phenomenon, a free metallic particle can move in the gas gap and finally adhere to the GIS insulating spacer surface, thereby creating a potential defect. As a consequence of such defects, partial discharges (PDs) can occur in the SF 6 insulated systems [4,5]. Such PDs are very dangerous to the integrity of the GIS equipment.…”

Section: Introductionmentioning

confidence: 99%

Partial discharge pattern analysis using support vector machine to estimate size and position of metallic particle adhering to spacer in GIS

Khan¹,

Khan²,

Budiman³

et al. 2014

Electric Power Systems Research

View full text Add to dashboard Cite

“…8 e . With the accumulation of surface charge, its effect on discharge becomes increasingly more significant [31]. While the discharge repetition rate decreases significantly from S2 to S3, the apparent charge at S3 is significantly higher than that at S2.…”

Section: Discharge Development and Surface Charge Accumulationmentioning

confidence: 99%

Surface charge accumulation and pre‐flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage

Liu

Xu³

et al. 2020

High Voltage

View full text Add to dashboard Cite

With the increase in the voltage and capacitance of gas-insulated transmission lines (GILs), the insulation failure of GIL has attracted more and more attention. Further understanding of the partial discharge (PD) and flashover characteristics of metal particles on the insulator surface, as well as the flashover mechanism, is necessary to reduce the failure rate and improve the reliability of the equipment. In this study, an ultra-high voltage (UHV) AC insulator PD test and measurement system based on the cross-reference pulse current (PC) and ultra-high frequency (UHF) methods were established. The PD development and flashover characteristics of 5 mm-long metal particles at different positions on the surface of a UHV AC insulator, as well as the surface charge accumulation, were studied. The results show that the discharge of millimetre-scale metal particles on the insulator surface under PD test conditions is relatively low (generally lower than 2PC), and it is difficult to be detected by the conventional PC and UHF methods due to their insufficient sensitivity. Moreover, it is found that the weak PDs of the millimetrescale metal particles will result in a charge accumulation on the insulator surface under AC voltage, which eventually will lead to the insulator flashover. The PDs of the UHV AC insulator before flashover are generally small, which will make it difficult for online monitoring systems to give an effective alarm before flashover.

show abstract

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

Cited by 12 publications

References 4 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 discharge pattern analysis using support vector machine to estimate size and position of metallic particle adhering to spacer in GIS

Surface charge accumulation and pre‐flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage

Contact Info

Product

Resources

About