Protection device with directional zone selective interlock functionality
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United States of America Patent
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Dec 26, 2017
Grant Date -
Apr 2, 2015
app pub date -
Sep 8, 2014
filing date -
Sep 10, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A protection device, externally connectable to an existing circuit breaker with zone selective interlock functionality, enables a circuit breaker to implement directional zone selective interlock. The protection device includes a first input port and a first output port connectable to a circuit breaker, and second and third ports for connecting to a protection device of another circuit breaker and for transmitting interlock signals via an input bus and an output bus inside the EDP. A control unit is configured to enable one of the second and third ports as a second input port and the other as a second output port according to the direction of current currently flowing through the circuit breaker; and configured to forward an interlock signal from the first input port to the output bus and to forward an interlock signal on the input bus received from the second input port to the first output port.
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