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Relationship between polarity of surface leader and contact angle on insulator with backing electrode under AC voltage application

Relationship between polarity of surface leader and contact angle on insulator with backing electrode under AC voltage application

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When AC high voltage is applied in air to a cylindrical insulator with a backing electrode the polarity of generated leaderlike surface discharges depends on the contact angle. The contact angle is the angle between the insulating surface and high voltage electrode on the insulator. In the range of the angle from 60° to 120° the negative surface leaders appear in the range from 120° to 180° the positive surface leaders appear. No negative surface leaders appear in the range of the angle from 120° to 180°. The onset voltage of the positive leader is higher than that of the negative one. AC flashover voltage along the surface in air also shows dependence on the contact angle, which results from the difference in the onset voltage between the positive and the negative leaders. Impulse flashover voltage, on the other hand, shows no precise contact angle dependence.

References

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      • T.S. Surdarshan , R.D. Dougal . Mechanisms of surface flashover along solid dielectrics in compressed gases: a review. IEEE Trans. , 5 , 727 - 746
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      • R. Lee , T.S. Sudarshan , J.E. Thompson , G.R. Nagabhushana . Predischarge current measurements in vacuum gaps bridged with plexi-glass insulators. IEEE Trans. , 3 , 280 - 286
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      • Japanese Electric Committee, JEC-212, 1981.
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      • E. Nasser . Development of spark in air from a negative point. J. Appl. Phys. , 2839 - 2847
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      • Y. Yamano , S. Kobayashi , Y. Takahashi . Improvement of flashover strength and reduction of surface charge-induced field enhancement of insulating material. IEEE Trans. , 2 , 189 - 195
http://iet.metastore.ingenta.com/content/journals/10.1049/ip-a-3.1993.0018
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