Effect of floating conducting objects on critical switching impulse breakdown of air insulation
- Inst. de Recherche d`Hydro-Quebec, Varennes, Quebec (Canada)
The paper analyses the mechanism of breakdown of phase-to-ground and phase-to-phase air insulation in the presence of large conducting floating objects, under critical switching impulse stress. A new physical modeling approach is introduced which involves determination of the potential of the floating object by charge simulation technique, assessment of streamer breakdown and/or leader inception and propagation in the partial gaps and finally predicts the critical breakdown voltage of various configurations. As to phase-to-ground insulation, the investigation covers rod-plane, conductor-plane and conductor-tower leg configurations with different gap spacings as well as different shapes, dimensions and positions of the floating object. The phase-to-phase study additionally includes the effect of negative switching impulse content of the applied stress. The model is in excellent agreement with experiment and provides a novel tool for assessment of the effect of floating objects on switching impulse breakdown of some basic air gap configurations relevant to live line work.
- OSTI ID:
- 136569
- Report Number(s):
- CONF-940702-; ISSN 0885-8977; TRN: IM9552%%111
- Journal Information:
- IEEE Transactions on Power Delivery, Vol. 10, Issue 3; Conference: 1994 Institute of Electrical and Electronic Engineers/Power Engineering Society (IEEE/PES) summer meeting, San Francisco, CA (United States), 24-28 Jul 1994; Other Information: PBD: Jul 1995
- Country of Publication:
- United States
- Language:
- English
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