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

journal contribution
posted on 29.06.2021, 00:37 by Sayidul Morsalin, Narottam Das
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.

History

Volume

14

Issue

10

Start Page

825

End Page

841

Number of Pages

17

eISSN

1751-8830

ISSN

1751-8822

Publisher

Institution of Engineering and Technology

Language

en

Peer Reviewed

Yes

Open Access

No

Acceptance Date

03/12/2020

External Author Affiliations

University of New South Wales

Author Research Institute

Centre for Intelligent Systems

Era Eligible

Yes

Journal

IET Science, Measurement and Technology