Systems analysis of ultra-high-speed relaying and its impact on transmission networks. Final report
The purpose of the study was to determine the value to the electric utility industry of ultra-high-speed fault clearing and, in particular, the value of one-cycle total fault clearing time for EHV and UHV systems. Protective relaying aspects were examined to determine to what extent existing relay schemes can be improved and to identify promising new concepts that would fulfill the requirements of one-cycle fault clearing. System stability studies were made for three different types of applications that would benefit from high-speed fault clearing. These applications included radial systems designed to be stable for normally cleared faults, energy centers designed to be stable for breaker failure, and ''dumbbell'' systems consisting of two large systems interconnected by weak ties. Nominal voltage levels of 345, 500, 765, and 1,100 kV corresponding to maximum voltage ratings of 362, 550, 800, and 1,200 kV were included in the analysis. Where appropriate, both existing and future machine reactances and inertia constants were used. Performance of the various systems were compared on the basis of permissible power transfer with one-cycle fault clearing compared to three-cycle fault clearing and were evaluated in terms of dollars per kilowatt-mile difference in transmission costs.
- Research Organization:
- Stone and Webster Engineering Corp., Boston, MA (USA)
- DOE Contract Number:
- EC-77-C-01-2097
- OSTI ID:
- 6597552
- Report Number(s):
- HCP/T2097-01
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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