115-Kv Bus Switching Surges
- 1 April 1960
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems
- Vol. 79 (3) , 777-781
- https://doi.org/10.1109/aieepas.1960.4500859
Abstract
In 1955, at the Black Dog Steam Station of Northern States Power Company (NSP), a 97-kv lightning arrester on the 115-2.4-kv reserve auxiliary transformer failed while de-energizing the 115-kv transfer bus with an air-break switch. The replacement of this arrester failed in 1957 when the 115-kv transfer bus was being energized through an air-break switch. These two arresters were not manufactured by the companies with which the authors are associated. Considering these failures as more than coincidental, a thorough investigation was initiated by NSP to attempt to explain how this transfer bus switching influenced the arrester failures. Analytical and Anacom (General Purpose Transient Analyzer) studies supplemented by field tests indicated sufficiently high overvoltages could be created by the transfer bus switch operation, due to a prestrike or restrike, to cause the lightning arrester to operate.Keywords
This publication has 2 references indexed in Scilit:
- Investigations of Switching Surges Caused by 345-Kv Disconnecting-Switch OperationTransactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, 1958
- Analytical Studies of Overvoltages Caused by Disconnecting-Switch OperationTransactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, 1958