Journal
HIGH VOLTAGE
Volume 5, Issue 3, Pages 327-333Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/hve.2019.0095
Keywords
flashover; electric fields; insulator contamination; power overhead lines; ice; power engineering computing; solid modelling; dimensional electric field simulation; flashover path analysis; ice-covered suspension insulators; ice-covered insulators; electric field distribution; actual icing situations; moderate icing condition; electric field distortion degree; icicle length; icicle deviation angle
Categories
Funding
- National Natural Science Foundation of China [51637002]
- Funds for the Central Universities of China [2018CDQYDQ0003]
- Fundamental Research Funds for the Central Universities [2019CDXYDQ0010]
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Flashover of ice-covered insulators seriously affects the safe operation of transmission lines. It is necessary to study the electric field distribution for flashover analysis of ice-covered insulators. The electric field of ice-covered insulators was mostly calculated by a two-dimensional (2D) axisymmetric model that cannot be well corresponded to actual icing situations. In this study, a 3D electric field simulation model of ice-covered suspension insulators under moderate icing condition with applied DC voltage was established. Two characteristic parameters, E-av and E-max were proposed to measure electric field distortion degree. Based on the simulation results, the effects of water film conductivity, icicle length, icicle deviation angle, and icicle distribution on E-av and E-max were studied. The results showed that icicles have a significant influence on the electric field distribution of insulators. E-av increases with the increase of icicle length and decreases with the increase of icicle deviation angle. E-max increases with the increase of the icicle length, icicle spacing and adjacent icicle length difference. When the icicle deviation angle is 45 degrees, E-max is the largest. Lastly, the possible flashover paths were analysed based on the simulation results, which would provide a theoretical basis for building a flashover model of ice-covered insulators.
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