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US 5,973,899 AGranted
Automated power feeder restoration system and method
AssigneePacifiCorp
InventorsBradley R. Williams, C. Thomas Eyford, III, Dean H. Miller
Life of this patent
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AssigneePacifiCorp
InventorsBradley R. Williams, C. Thomas Eyford, III, Dean H. Miller
Estimating the term…
A feeder restoration method starts in response to an overcurrent fault on a feeder (22) that causes a circuit breaker (42) to trip open, reclose once, trip again, and attempt to reclose again. During the time period between the first and second reclosings, any remote sectionalizing switches (46) on the faulty feeder are opened if they have also sensed the overcurrent fault, and a substation processor (50) evaluates the status of the faulty feeder and an alternate feeder (32, 34). After the second trip of the circuit breaker, the processor verifies whether the remote sectionalizing switch was closed and a remote tie switch (40) to the alternate feeder was open. If the circuit breaker locks open, the substation processor determines whether the remote sectionalizing switch did not sense the overcurrent condition (which indicates that the fault is between the circuit breaker and the sectionalizing switch) or simply failed to open. The processor then verifies that the remote sectionalizing switch voltage is zero and opens the switch. The processor next determines whether the alternate feeder and its associated transformer (30) and circuit breaker (44) can pick up the dropped load, and if they can, the substation processor modifies the alternate circuit breaker trip current settings to accommodate the new total load plus a surge current and closes the remote tie switch to transfer the load to the alternate feeder.
In a power distribution system including at least a first circuit breaker that receives power from a first transformer and provides power to a first feeder section that is connected to a second feeder section by a sectionalizing switch, and a second circuit breaker that receives power from a second transformer and provides power to a third feeder section, the second and third feeder sections being interconnectable by a tie switch and the first, second, and third feeder sections providing power to respective first, second, and third loads, a method of restoring power in response to a fault on a feeder section, comprising:
In a power distribution system including at least a first circuit breaker that receives power from a first transformer and provides power to a first feeder section that is connected through a sectionalizing switch to a second feeder section, and a second circuit breaker that receives power from a second transformer and provides power to multiple feeder sections through multiple sectionalizing switches, the second feeder section being interconnectable by a tie switch to one of the multiple feeder sections and the first, second, and multiple feeder sections providing power to respective first, second, and multiple loads, a method of restoring power to a load in response to a fault on a feeder section, comprising:
Dependencies are inferred from the claim text.