Measuring partial discharges in DC insulation systems. A challenge, but also a must

Montanari, Gian Carlo; Seri, Paolo; Cirioni, Leonardo

doi:10.1109/icpadm.2018.8401147

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…For a gap length d, the breakdown voltage of a non-uniform field gap is expressed as [14,79] γ[e ∫ 0 d αdx − 1] = 1 (7) In most cases, the formula is impractical to predict the inception voltage for corona discharge. Based on many experimental measurements, Peek proposed an empirical formula of corona inception field for a concentric cylindrical electrode arrangement, including a smooth surface with an inner radius r i and an outer radius r o .…”

Section: Inception Voltagementioning

confidence: 99%

“…has critical importance to the sound functioning of power networks [1][2][3]. The insulation status degrades gradually with the operating time, mainly due to the onfield electrical, mechanical and thermal stresses which can eventually lead to complete failure of the whole equipment [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The regular condition monitoring or diagnostic testing of electrical insulation is important as it can significantly reduce the potential risk of catastrophic damage due to equipment failure while in service [4,[7][8][9][10][11]. For condition assessment, partial discharge (PD) measurements have been used as a powerful diagnostic tool for a long time [6,[11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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

Morsalin

Das

2020

IET Science, Measurement &Amp; Technology

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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.

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Section: Inception Voltagementioning

confidence: 99%