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- Title
An Analysis of Positive Switching Impulse Voltage and negative streamer growth in point-sphere gap towards Valve Hall.
- Authors
K., Vinoth Kumar; M., Kowsalya; In-Ho Ra; N., Samanvita; Singh, Amarjeet; P., Venkatesh Kumar
- Abstract
Relevant investigations into HVDC valve hall discharge characteristics, particularly in sphere-plane gaps equipped with numerous spherical shielding balls, play a crucial role in insulation design. In order to gain insights into the discharge process within such gaps, a series of experiments were carried out using positive switching impulse voltage. The results indicated that larger spherical electrode diameters contributed to a faster streamer-to-leader transition process. However, initial charge injection of the streamer was notably higher in sphere-plane gaps than in rodplane gaps. These findings shed valuable light on the unique characteristics of the discharge phenomenon in HVDC valve halls and can inform more effective insulation design strategies and the investigation on negative streamer development in synthetic ester and mineral oil utilizing a pressboard barrier electrode method is discussed in this article. The point and sphere were separated from one another at various locations by a 5 mm thick pressboard barrier. Standard lightning impulse voltage served as the reference system. This made it possible to apply the data to actual insulating systems with narrower oil gaps and insulating barriers between them. In order to compare alternate liquid dielectric characteristics to mineral oils, it is critical to understand how the pressboard barrier impacts streamer behaviour within the electrode gap. This is what the study set out to determine. Results showed that the pressboard barrier outperformed free liquid gaps in terms of efficiently preventing breakdown in both liquids studied as well as lowering the streamers' propagation velocity in synthetic ester.
- Subjects
INSULATING oils; LIQUID dielectrics; MINERAL oils; VALVES; CHARGE injection; INSULATING materials; ELECTRIC insulators &; insulation
- Publication
Przeglad Elektrotechniczny, 2024, Vol 2024, Issue 5, p190
- ISSN
0033-2097
- Publication type
Article
- DOI
10.15199/48.2024.05.35