| 摘要 |
<p>An arc flash system (2) includes a circuit breaker (6) having separable contacts (12), an operating mechanism (14), a trip unit (16) including a sensor (18) sensing current (20) flowing in a power circuit (4), a trip circuit (22) cooperating with the operating mechanism to trip open the contacts responsive to the sensed current (21) or a first signal (24), and a communication interface (26) outputting the sensed current, and an interface circuit (28) including a processor (30) having a first output (32) of the first signal, an input (33) of a second signal (34), and a second output (36) of a third signal (38), and a communication interface (40) cooperating with the processor to determine (138,144,146,148,150,152) and communicate (158) cause of trip information (123) to the trip unit communication interface, input the sensed current, and communicate the sensed current to the processor. A light sensor (8) senses light from an arc flash (42) associated with the power circuit and outputs the second signal. A shorting apparatus (10) shorts the circuit responsive to the third signal.</p> |
