General expression for positive switching impulse strength valid up to extra long air gaps
- 1 November 1975
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Apparatus and Systems
- Vol. 94 (6) , 1989-1993
- https://doi.org/10.1109/t-pas.1975.32045
Abstract
A new algebraic expression has been established for the critical sparkover voltage (CSOV) afair insulation submitted to positive switching impulses. By using the concept of the gap factor, the expression is found to be valid for all practical gap configurations in the distance range 1 to at least 30 m. Based on these considerations, an absolute limit of 2.4 MV is foreseen for the rated voltage of AC systems. Sparkover voltages under A.C. or lightning impulses are also predictable. Complementary investigations concerning the physics of discharge are needed for further improvements.Keywords
This publication has 4 references indexed in Scilit:
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- Influence of Switching Impulse Wave Shape on Flashover Voltages of Air GapsIEEE Transactions on Power Apparatus and Systems, 1973
- Switching and Lightning Impulse Discharge Characteristics of Large Air Gaps and Long Insulator StringsIEEE Transactions on Power Apparatus and Systems, 1968
- Influence of Air Gap Characteristics on Line-to-Ground Switching Surge StrengthIEEE Transactions on Power Apparatus and Systems, 1967