Switchgear Manual Control Plug Racking Interlock Structure

摘要

Interlock structure for a circuit breaker is constructed and arranged such that 1) when a control plug is disconnected from a socket, a portion of a linkage structure engages a racking linkage, causing a portion of the racking linkage to engage a racking screw, preventing the racking screw from rotating and thus preventing racking of the circuit breaker, and 2) when the control plug is connected with the socket, the linkage structure is actuated thereby moving the portion of the linkage structure to disengage from the racking linkage such that the portion of the racking linkage disengages from the racking screw, permitting the racking screw to rotate thereby permitting the circuit breaker to be racked to a connected position, where the primary contacts are connected to the main bus.

主权项

1. An interlock structure for a circuit breaker, the circuit breaker having primary contacts connectable with a main bus, and a control plug for providing an auxiliary control voltage, the interlock structure comprising:
a racking truck constructed and arranged to receive the circuit breaker and to move the circuit breaker with respect to a rail, the racking truck comprising a rotatable racking screw for racking the circuit breaker, and a racking linkage associated with the racking screw, and normally biased so as to be disengaged from the racking screw, a socket constructed and arranged to receive the control plug, linkage structure between the socket and the racking linkage, the interlock structure being constructed and arranged such that 1) when the control plug is disconnected from the socket, a portion of the linkage structure engages the racking linkage, causing a portion of the racking linkage, against the bias thereon, to engage the racking screw, preventing the racking screw from rotating and thus preventing racking of the circuit breaker, and 2) when the control plug is connected with the socket, the linkage structure is actuated thereby moving the portion of the linkage structure to disengage from the racking linkage such that the portion of the racking linkage disengages from the racking screw, permitting the racking screw to rotate thereby permitting the circuit breaker to be racked to a connected position, where the primary contacts are connected to the main bus.