Theoretical Studies of the Cumulative Effects Related to the Application of Strong Electric Fields on the Lifetime of Solid Insulation Structures
The cumulative breakdown process of solid dielectrics results in partial discharge and degradation. As the pulse number or the time increases, the total insulation performance of a solid insulation structure decreases and the breakdown probability increases until the final breakdown occurs. A formul...
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Published in | IEEE transactions on plasma science Vol. 49; no. 3; pp. 1201 - 1206 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
New York
IEEE
01.03.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
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Summary: | The cumulative breakdown process of solid dielectrics results in partial discharge and degradation. As the pulse number or the time increases, the total insulation performance of a solid insulation structure decreases and the breakdown probability increases until the final breakdown occurs. A formula to describe the breakdown probability (<inline-formula> <tex-math notation="LaTeX">P </tex-math></inline-formula>) in the cumulative breakdown process is presented and a lifetime formula is defined as 1/<inline-formula> <tex-math notation="LaTeX">P </tex-math></inline-formula>. By assuming that the breakdown voltage (<inline-formula> <tex-math notation="LaTeX">V_{\mathrm {BD}} </tex-math></inline-formula>) conforms to the Weibull statistical distribution, a lifetime formula is derived with <inline-formula> <tex-math notation="LaTeX">V_{\mathrm {BD}} </tex-math></inline-formula> and its relative variance (<inline-formula> <tex-math notation="LaTeX">\delta </tex-math></inline-formula>) as the key parameters. It is found that the longest lifetime and the operation voltage conform to a power relation with 1/<inline-formula> <tex-math notation="LaTeX">\delta </tex-math></inline-formula> as the power exponent. In practice, <inline-formula> <tex-math notation="LaTeX">\delta </tex-math></inline-formula> should be as small as possible if a long lifetime is expected. |
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ISSN: | 0093-3813 1939-9375 |
DOI: | 10.1109/TPS.2021.3055813 |