The role of supply frequency in the evaluation of partial discharge inception voltage in XLPE-embedded cavities

Cavallini, A.; Krotov, V. A.; Montanari, Gian Carlo; Morshuis, P.H.F.; Mariut, Larisa

doi:10.1109/ceidp.2012.6378826

Cited by 17 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initial electron generation rate is strongly dependent on the supply voltage amplitude and frequency, material characteristics, geometries etc. [17,27,28]. The free electrons are usually generated from two main sources: surface emission and volume ionisation [24,29].…”

Section: Initial Free Electrons Availabilitymentioning

confidence: 99%

“…Surface emission is the major source of providing free electrons in which under the influence of electric stress and temperature, free electrons are generated from the insulation surface, cavity wall or the electrode surface [9,27,30]. Surface emission can be originated from the de-trapping of electrons from shallow traps within the insulation, the injection from boundary electrodes, the impact of ionisation process etc.…”

Section: Surface Emissionmentioning

confidence: 99%

“…Volume ionisation also provides free electrons via radioactive reaction due to collision between energetic photons and neutral gas molecules [27,33]. The ionisation process largely depends on the gas pressure, gas volume subjected to the ionisation, and the gas contents.…”

Section: Volume Ionisationmentioning

confidence: 99%

“…The PD process is very much dependent on the rising/falling time of the applied voltage and different time constants associated with the time-lag characteristics of the free charges (either electrons or ions) before or after a PD event. This dependency implies that a PD activity is highly affected by the applied voltage frequency [21][22][23][24][25][26][27][28]. External factors such as environmental conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…temperature, pressure moisture, humidity etc. ), and excitation waveforms also have some impacts [24][25][26][27][28]. A PD event is associated with various physical processes (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Diagnostic aspects of partial discharge measurement at very low frequency: a review

Morsalin

Das

2020

IET Science, Measurement &Amp; Technology

View full text Add to dashboard Cite

Electrical insulation of high voltage (HV) power equipment/apparatus plays very important roles in the sound functioning of power systems. Examining the insulation condition through partial discharge (PD) measurements has considerable importance as the presence of PDs in any HV systems stands for a sign of defects and degradations in electrical insulation. Generally, the PD measurements are performed with a supply voltage of normal power frequency (PF-50/60 Hz). As an attractive alternative, the PD measurement with a very low frequency (VLF-1 Hz or lower) applied voltage has emerged as a powerful diagnostic tool. A PD event is a random physical process, it depends mostly on the availability of free electrons that triggers the PD and the presence of space charge usually originated after a discharge. As the discharge characteristics vary with the supply voltage frequency; thus, the existing interpretation knowledge at 50 Hz may or may not be directly applicable to other test frequencies, particularly in the VLF range. Therefore, to provide a general insight, this paper presents various diagnostic aspects of PD measurements, and at the end, various discharge sources (e.g., void, surface, and corona) and their behaviours under varying the test voltage frequencies are discussed in detail.

show abstract

Section: Initial Free Electrons Availabilitymentioning

confidence: 99%

Section: Surface Emissionmentioning

confidence: 99%

Section: Volume Ionisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…temperature, pressure moisture, humidity etc. ), and excitation waveforms also have some impacts [24][25][26][27][28]. A PD event is associated with various physical processes (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations