Investigation on the surface discharge phenomenon at the oil-pressboard interface

Zainuddin, Hidayat; Mitchinson, P. M.; Lewin, P.L.

doi:10.1109/icdl.2011.6015439

Cited by 21 publications

(19 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both margin values were determined before the surface discharge experiment was commenced in order to establish the voltage range over which surface discharge experiment can be conducted without immediate flashover. The voltage level is greater than that previously reported [2,4], i.e. 25 kV which was applied on the 3% moisture of pressboard sample due to the extremely long period to get the first leakage current to occur when 6% and 9%.…”

Section: B Experimental Proceduresmentioning

confidence: 98%

“…The vaporized moisture and generated gasses push the remaining oil molecules out of the pressboard pores, thus making the white marks seen as the presence of a gaseous channel [8]. Normally, once the white marks bridge the gap, repetitive earth arcs will occur [4] and this is followed by full discharge that sometimes is visible in the form of full-gap arcing creeping at the oil-pressboard interface. The full discharges lead to a relatively small leakage current to flow with the characteristics that have been discussed in the previous section.…”

Section: Comparison Between Dry-band Arcing and Full Dischargementioning

confidence: 98%

“…The full discharges lead to a relatively small leakage current to flow with the characteristics that have been discussed in the previous section. The occurrence of subsequent full discharges [4] suggests that the charges accumulated on the pressboard surface are swept along with the full discharge during the conduction of leakage current. This can be explained by continuous PD activity will maintain the ionization process only to promote the next full discharge event after a certain period.…”

Section: Comparison Between Dry-band Arcing and Full Dischargementioning

confidence: 99%

See 2 more Smart Citations

Characteristics of leakage current during surface disharge at the oil-pressboard interface

Zainuddin

Lewin

Mitchinson

2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

Self Cite

View full text Add to dashboard Cite

Surface discharge at the oil-pressboard interface leads to the development of a conducting path that is generally accepted as white marks due to localized heating. The visible white marks are believed to be due to partial discharge (PD) energy that is high enough to dry out the pressboard through vaporizing the moisture and breaking oil molecules to generate gases in the pressboard pores. A long period of electrical stress applied to a surface discharge experiment using a needle-bar electrode configuration has led to the formation of full-gap white marks on the pressboard surface that bridged the needle tip and earth bar. During the surface discharge, leakage current may occur intermittently that sometimes is visible in the form of full discharge of arcing at the oil-pressboard interface bridging the needle tip and earth bar. This condition is expected to be similar to that of dry-band arcing from inclined-plane tracking experiments for outdoor insulation. This paper explains the surface discharge experiment and details the obtained leakage current characteristics in terms of waveforms and frequency spectra. Correlation between leakage current measurements using a shunt resistor and PD signal detection has been undertaken in order to identify the useful information for condition monitoring of surface discharge in a large transformer. An equivalent circuit to represent the leakage current occurrence at the oil-pressboard interface without considering the superimposed pulses due to individual PD events is also proposed. The effect of moisture on the experimental results is also discussed

show abstract

Section: B Experimental Proceduresmentioning

confidence: 98%

Section: Comparison Between Dry-band Arcing and Full Dischargementioning

confidence: 98%

Section: Comparison Between Dry-band Arcing and Full Dischargementioning

confidence: 99%

See 1 more Smart Citation

Characteristics of leakage current during surface disharge at the oil-pressboard interface

Zainuddin

Lewin

Mitchinson

2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

Self Cite

View full text Add to dashboard Cite

show abstract

“…The random appearance of gas bubbles that arise from the discharge tip may also appear anywhere along the white marks as seen [5]. The white marks play an important role in the occurrence of full discharge events that bridge the gap between the needle tip and the earth bar [6].…”

Section: Introductionmentioning

confidence: 98%

Study on the influence of gases on white marks and carbonized tracks generated by partial discharge in transformer oil-paper insulation

Cheng

Chen

et al. 2013

2013 IEEE International Conference on Solid Dielectrics (ICSD)

View full text Add to dashboard Cite

Partial discharge (PD) in oil-paper insulation of transformer is considered to be a serious fault condition. The movement of excessive charge over pressboard may result in mechanical and chemical damage to material through thermal and electronic action. With the development of PD, gases, white marks and tracks appeared. To research the relationship among the gases white marks and carbonized tracks, a needle-plate electrode configuration was set in laboratory. Pressboards with grooves of varying depths were made to release the gases. And all the pressboards were dissected layer by layer so as to observe carbonized tracks inside the pressboard. Besides, the phenomena of gases, white marks and tracks were recorded by taking photos. The experiment showed that: with the development of PD, carbonized tracks appeared on the pressboards. And as the decomposition of the insulation oil and pressboards, a large amount of gases were generated and overflowed through the pressboard pores, then white marks were formed; Moreover, due to the existence of residual gases, the surface of pressboard was raised where PD happened; As the gases loosed and even broke the pressboards' structure, PD took place more easily. As a result, carbonized tracks grew to be more.

show abstract

“…The length, velocity, charge, current, light emitted and voltage gradient of streamers are some of the parameters affected by the presence of dielectric solid barriers [2][3][4][5][6][7][8][9][10][11][12][13][14][21][22][23][24][25][26][27][28]. Strong indications of the influence of the permittivity and thickness of the solid on the mechanism of streamer propagation has been reported [1,5].…”

Section: Introductionmentioning

confidence: 99%

First mode negative streamers along mineral oil-solid interfaces

Ariza¹,

Becerra

Hollertz³

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

This is the published version of a paper published in IEEE transactions on dielectrics and electrical insulation. Citation for the original published paper (version of record):Ariza, D., Becerra, M., Hollertz, R., Wågberg, L., Pitois, C. (2017) First Mode Negative Streamers along Mineral Oil-solid Interfaces. IEEE transactions on dielectrics and electrical insulation, 24(4)Access to the published version may require subscription. ABSTRACTThis document presents an experimental study on the propagation of first mode negative streamers along mineral oil-solid interfaces. Samples made of an oil impregnated kraft paper and a low-porosity paper made from cellulosic micro and nano fibrils, as well as different polymeric films (low density polyethylene (LDPE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF)) are used as the solid. A comparison of the length, charge and velocity of streamers for all different mineral oil-solid interfaces is reported. It is shown that streamers propagate longer and faster along mineral oil-solid interfaces with low surface roughness, low porosity and higher electrical permittivity than mineral oil. Those streamers show a quasi-continuous injection of charge in the early stage of their propagation. This quasi-continuous charge injection consists of a sequence of small charge steps separated by few tens of nanoseconds in between. In comparison, the streamers that propagate along surfaces with similar permittivity to the mineral oil have lower injection of charge and higher stopping voltage conditions than streamers propagating free in the liquid without any solid barrier.

show abstract

Investigation on the surface discharge phenomenon at the oil-pressboard interface

Cited by 21 publications

References 6 publications

Characteristics of leakage current during surface disharge at the oil-pressboard interface

Characteristics of leakage current during surface disharge at the oil-pressboard interface

Study on the influence of gases on white marks and carbonized tracks generated by partial discharge in transformer oil-paper insulation

First mode negative streamers along mineral oil-solid interfaces

Contact Info

Product

Resources

About