Patent ID: 8270136
Filing Date: 2012-09-18
Classification: H02H

Abstract:
1. A circuit breaker zone selective interlock system comprising: a first current sensor; a first processor electrically coupled to said first current sensor, said first processor being responsive to computer executable instructions to transmit an interlock signal in response to detecting a first fault condition with said first current sensor, said first processor being further responsive to computer executable instructions for transmitting said interlock signal in response to detecting a second fault condition with said first current sensor, wherein said first processor is further responsive to computer executable instructions to trip a first circuit breaker in response to detecting said first fault condition; a second current sensor; a second processor electrically coupled to said second current sensor and coupled for communication with said first processor, said second processor being responsive to computer executable instructions to change a trip curve parameter to a user-defined trip curve parameter in response to said interlock signal due to said first fault condition, wherein said second processor is further responsive to computer executable instructions to delay a tripping response in response to said interlock signal due to said second fault condition, wherein said second processor is further responsive to computer executable instructions to trip a second circuit breaker in response to said second current sensor detecting a current level at or above an instantaneous trip threshold parameter, wherein said second fault condition is a fault having a current value in the instantaneous region of the trip curve parameter.