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US 2003/0223167 A1Published application
Distributed bus differential relay system
OwnerEric A. Udreninventor
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OwnerEric A. Udreninventor
Estimating the term…
A distributed bus differential relay system has a separate differential relay element at each feeder location to trip the associated circuit breaker in response to a fault in the protected bus. The only conductors between feeders form a set of leads connecting current transformers in each of the feeders in parallel. Preferably, the current transformer in each feeder also serves as the current transformer for the associated circuit breaker and the differential relay element is incorporated into the overcurrent relay or trip unit of the circuit breaker which is implemented by a microprocessor. Compliance voltage across the cts is limited by a varistor or saturating reactor which is protected from overheating by a time delayed shorting device.
A distributed bus differential relay system for an electric power distribution system comprising a bus, a plurality of feeder lines including at least one feeder line supplying power to said bus and the remaining feeder lines connected to draw power from said bus, and a plurality of circuit breakers each connecting an associated one of said feeder lines to said bus, said relay system comprising:
Dependencies are inferred from the claim text.