Grounding Effectiveness at Grand Coulee 230-Kv Switchyards Verified by Staged Fault Tests
- 1 July 1951
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Transactions of the American Institute of Electrical Engineers
- Vol. 70 (2) , 1547-1552
- https://doi.org/10.1109/T-AIEE.1951.5060598
Abstract
Very little has been published in the past regarding the hazard to the integrity of long control circuits due to possible excessive rise in ground potential at one end of the circuits during station faults; and the verification of the safety of such control circuits through actual tests. This paper describes the rather unique arrangement at Grand Coulee power plant wherein the plant is located at the bottom of the Columbia River Channel and one of the associated 230-kv switching stations is located on a rocky plateau approximately 600 feet higher in elevation, thus requiring control cables over 4,000 feet in length. By means of several fault tests staged specifically for this purpose, and as a by-product of subsequent high-interrupting capacity circuit breaker tests, the actual rise in ground potential was determined and the safety of the control circuits positively verified, under 60-cycle fault conditions.Keywords
This publication has 2 references indexed in Scilit:
- Field Tests at Grand Coulee Dam on 10,000-Mva 230-Kv Low-Oil-Content Impulse Circuit BreakerTransactions of the American Institute of Electrical Engineers, 1951
- Development of the 230-Kv Ring Bus for Grand Coulee Power PlantTransactions of the American Institute of Electrical Engineers, 1948