Phase-to-phase switching surge design. Addendum to transmission line reference book: 115-138 kV compact line design. Final report
EPRI project RP1492 extends the earlier project RP1202 to provide phase-phase switching surge design information for overhead transmission lines. This report combines information from both projects for phase spacings from 0.9 to 7.3 m (24 feet), covering designs from 115 kV to compact 765 kV. Phase-phase switching surges are considerably more complex than phase-ground, so the effects of numerous parameters on flashover probability are required. The most significant are provided here, including alpha, atmospheric factors, waveshapes and timing of phase-ground components, and line dimensions. An analytical study of the physics of breakdown in air was directed towards improved understanding of atmospheric effects on phase-phase flashover. Good results were obtained from a correction factor developed from physical analysis. These studies were augmented by reanalysis of data taken at a high-altitude site (Leadville). Advanced statistical methods included experiments using response surface techniques with accelerated teting methods, and maximum-likelihood data analyses.
- Research Organization:
- Power Technologies, Inc., Schenectady, NY (USA)
- OSTI ID:
- 5957893
- Report Number(s):
- EPRI-EL-3147; ON: DE83902673
- Country of Publication:
- United States
- Language:
- English
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Phase-to-phase switching surge design. Addendum to Transmission Line Reference Book: 115-138 kV compact line design. Final report
Transmission line reference book: 115--138 kV compact line design