Journal ArticleDOI
Understanding the surface discharge characteristics of thermally aged copper sulphide diffused oil impregnated pressboard material
TLDR
In this article, the impact of thermal aging with copper sulphide diffused oil impregnated pressboard (OIP) material for surface discharge inception voltage (SDIV) variation was investigated.Abstract:
An attempt has been made to understand the impact of thermal aging with copper sulphide diffused oil impregnated pressboard (OIP) material for surface discharge inception voltage (SDIV) variation. The SDIV of Copper sulphide diffused OIP material reduces with increase in thermal aging. The UHF signals generated due to surface discharges with copper sulphide diffused OIP at the point of inception have frequency content in the range 0.7-1.5 GHz with its dominant frequency at 0.9GHz. HFCT measurement indicated that the rise time of injected current pulse due to surface discharge activity in the negative and positive half cycle of the AC voltage are about 0.8ns and 1ns respectively. It is also found that increase in thermal aging of copper sulphide diffused OIP, the amplitude and width of the current pulse increases. The magnitude of surface charge and its mean life is high with thermal aging temperature of copper sulphide diffused OIP material. Polarity of surface charge acquired by OIP due to AC corona charging depends on the surface condition of the pressboard material and its charge decay rate is lower than under DC voltage. Atomic Absorption Spectroscopy (AAS) and Energy Dispersive Spectrometry (EDS) study confirms the presence of copper sulphide on the surface of OIP and is found to be increased for copper sulfide diffused OIP material compare to unused OIP material. Scanning Electron Microscope (SEM) analysis indicates formation of cracks with thermally aged OIP material. Phase Resolved Partial Discharge (PRPD) study indicates that the surface discharge activity occurs near the peaks of the applied AC voltage at inception and at the rising portion of the applied AC voltage at higher voltages. It is found that the tensile and flexural strength reduces drastically for thermally aged copper sulphide diffused OIP material compare to unused specimen.read more
Citations
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Journal ArticleDOI
Failure mechanism of transformer oil-immersed cellulosic insulation induced by sulfur corrosion
Sihang Gao,Lijun Yang,T. Ke +2 more
TL;DR: In this article, the authors investigated the effect of sulfur corrosion on the characteristics of transformer cellulosic insulation and showed that sulfur contamination had a minimal effect on the power-frequency breakdown voltage but considerably decreased its long-term electrical life.
Journal ArticleDOI
The Evolution of Trapping Parameters on Three-Layer Oil-Paper of Partial Discharge Degradation for On-Board Traction Transformers
TL;DR: It can be concluded that surface charge and trap distribution are helpful to clarify partial discharge (PD) mechanism.
Journal ArticleDOI
Surface Discharge Characteristics of Different Solid–Liquid Insulation Materials in Power Transformers
TL;DR: In this paper, the effects of different solid and liquid insulation materials on the surface partial discharge (PD) characteristics were investigated using PD inception voltages (PDIV), apparent charges (pC), and phase-resolved PD (PRPD) patterns.
Journal ArticleDOI
Understanding the dielectric properties of pressboard material thermally aged in Dibenzyl Disulphide (DBDS) included transformer oil
TL;DR: In this paper, the surface discharge inception voltage (SDIV) of unaged and copper sulphide diffused OIP material was studied by adopting Ultra High Frequency (UHF) technique.
References
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Journal ArticleDOI
A study of the degradation of cellulosic insulation materials in a power transformer. Part III: Degradation products of cellulose insulation paper
TL;DR: In this paper, the furan products formed by accelerated ageing of cellulose insulation paper in Shell Diala B transformer insulation oil over the temperature range 130-170 °C are investigated, and the results have been correlated with those observed for the changes in the molecular weight and tensile strength of the insulation paper.
Journal ArticleDOI
Partial discharge characteristics over differently aged oil/pressboard interfaces
TL;DR: In this article, the authors used the TJ (triple junction) model to study the characteristic of partial discharge (PD) from inception to flashover, and the max PD charge, pattern, frequency and current pulse were measured during the flashover process.
Journal ArticleDOI
Concentration dependence of corrosive sulfur on copper-sulfide deposition on insulating paper used for power transformer insulation
TL;DR: In this article, the authors investigated copper-sulfide deposition on coil insulating paper used for power transformer insulation with the aim of obtaining the concentration dependence of corrosive sulfur.
Highly Sensitive Detection Method of Dibenzyl Disulfide and the Elucidation of the Mechanism of Copper Sulfide Generation in Insulating Oil
TL;DR: In this paper, a high sensitivity detection method of dibenzyl disulfide (DBDS) in insulation oil was realized using solid phase extraction (SPE) with active alumina adsorbent followed by gas chromatography equipped with a mass spectrometry (GC-MS).
Journal ArticleDOI
Surface discharge initiated by immobilized metallic particles attached to gas insulated substation insulators: process and features
TL;DR: In this paper, the developing process of surface discharges initiated by immobilized metallic particles attached to Gas Insulated Substation (GIS) insulators under gradually-raised applying voltages was studied.
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