Effect of floating conducting objects on critical switching impulse breakdown of air insulation

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · IEEE Transactions on Power Delivery

DOI:https://doi.org/10.1109/61.400917· OSTI ID:136569

Rizk, F A.M. ^[1]

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1. 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--
• Journal Information: IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 3 Vol. 10; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
BREAKDOWN
ELECTRIC ARCS
ELECTRICAL INSULATORS
FLASHOVER
MAINTENANCE
POWER SYSTEMS
POWER TRANSMISSION LINES