Very high frequency overvoltages at open air EHV substations during disconnect switch operations
Journal Article
·
· IEEE Transactions on Power Delivery
EHV open air substations experience flashovers produced by very high frequency overvoltages (VHF OV) during disconnect switch operations. It was found during field tests that the highest measured value of sparkover voltage across the EHV switch gap between contacts during its operation was 1.9 p.u. The most unfavorable scheme, theoretically, occurs when a bus is fed from a single transformer, without outgoing lines. Calculations showed that in 787 and 525 kV substations with branched buses VHF OV could result in flashovers on a bus open end with unfavorable ratio of bus lengths. For transformer insulation protected with an arrester VHF OV are not dangerous. Some protective measures are recommended.
- OSTI ID:
- 372253
- Report Number(s):
- CONF-960111--
- Journal Information:
- IEEE Transactions on Power Delivery, Journal Name: IEEE Transactions on Power Delivery Journal Issue: 3 Vol. 11; ISSN 0885-8977; ISSN ITPDE5
- Country of Publication:
- United States
- Language:
- English
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