Influence of Electrical Discharges in Oil and Combinations of Oil and Paper

Mathes, K. N.

doi:10.1109/tei.1976.297926

Cited by 14 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oil-paper insulation is the main form of internal insulation in power transformers [7][8][9][10]. There is much research available into the aging of oil-paper insulation and the factors affecting PD therefrom [11][12][13][14][15]. Mitchson designed a model for point discharge and investigated the effects of voltage and time on oil-paper insulation therewith [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Wang

Zhang

Jiang

et al. 2019

IET Science, Measurement & Technology

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Wang

Zhang

Jiang

et al. 2019

IET Science, Measurement & Technology

View full text Add to dashboard Cite

“…In oil-immersed transformer turn insulation, there are some random bubbles in the insulation [22]. The oilpaper insulation could be simplified by a double composite dielectric model [23].…”

Section: Discussionmentioning

confidence: 99%

Electrical aging lifetime model of oil-impregnated paper under pulsating DC voltage influenced by temperature

Grzybowski

2013

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

Main insulation of windings connected with valves in high voltage direct current (HVDC)convert transformers withstands pulsating DC voltages. This paper presents breakdown properties of oil-impregnated paper under pulsating DC voltages at different temperatures. Progressive stress tests were carried out to obtain breakdown voltages of oil-impregnated paper with thickness of 0.2 mm under pulsating DC voltages at different temperatures. Constant stress tests were executed to measure time to breakdown of the oil-paper specimens. Both types of the experiments were also undertaken under either AC or DC voltages. An electrical aging lifetime model was proposed for the oil-impregnated paper, and parameters of the electrical aging lifetime model were presented. Experiments and analysis results show that the breakdown voltages and time to breakdown of oilpaper insulation are influenced by temperature significantly.

show abstract

“…In transformer turn/turn insulation, PD can be incepted at gas pockets inside the cellulose [7]. Vacuum-degassed and perfectly impregnated papers achieve very high PDIV values.…”

Section: Methodsmentioning

confidence: 99%

“…All PDIV values in the paper are reported in the maximum values. Since, after some time, PD activity changes due to conditioning [7], the PDIV under sinusoidal voltage with and without notches were measured at regular intervals during test time. Then, the detected PDIV under notched voltage was reported in relative values as:…”

Section: Methodsmentioning

confidence: 99%

“…A diagnostic approach of HVDC systems subjected to PD was reported in [6]. However, little of this work is for paper/oil insulation, probably due to the inherent complexity of testing paper/oil insulated systems [7]. Moreover, there is little information about PD activity under sinusoidal notched voltages, which seems an important issue as shortcircuited turns can often be found by forensic analysis [8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The role of HVDC voltage waveforms on partial discharge activity in paper/oil insulation

Jiang

Cavallini

Montanari

et al. 2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

View full text Add to dashboard Cite

This paper discusses the role of high voltage direct current (HVDC) voltage waveforms on partial discharge (PD) activity in paper/oil insulation systems. A variety of voltages were simulated by the PSIM software and synthesized using a high voltage amplifier. Kraft paper sheets were used to create defects incepting PD. The PD signals were coupled by a high frequency ferrite core current transformer. PD quantities including PD inception voltage (PDIV), pattern, amplitude distribution and repetition rate were recorded. The results show that the PDIV under notched voltage becomes higher increasing firing and overlap angles. PD patterns change with the HVDC voltage waveforms showing that large PD likely occurs at the rising front of the notches. PD amplitude and repetition rate are both directly proportional to notch depth. It is expected that such results can improve the design of UHV converter transformers.

show abstract

Influence of Electrical Discharges in Oil and Combinations of Oil and Paper

Cited by 14 publications

References 8 publications

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Effect of the oil‐paper insulation aging on partial discharge characteristics in a hemispherical surface model

Electrical aging lifetime model of oil-impregnated paper under pulsating DC voltage influenced by temperature

The role of HVDC voltage waveforms on partial discharge activity in paper/oil insulation

Contact Info

Product

Resources

About