ACB

The ACB system connects to the entire power system at one point, where the implication of failure is not accepted. Consideration is given to the fault current available at the Point of Common Coupling (PCC) panel when selecting the ACB model and size. The Busbar Protection System requires you to size the ACB using the calculations as follows: You must review the actual continuous load, if the busbars will handle future expansion and any faults that may occur when using your ACBs will produce contact erosion.

The method that you use to determine your trip unit settings will depend on the philosophy that you have for protecting your equipment. The long time trip, short time trip, instantaneous trip and earth fault trip settings must coordinate with those trip units that you intend to coordinate with downstream MCCBs to ensure that you maintain selectivity.

The incomer and bus coupler schemes must be studied in order to understand how the closing logic and mechanical interlocks work together. Along with the trip units, you can apply accessory options such as motorised operation, shunt trip and under voltage release to satisfy requirements for remote operation or automatic transfer.

The design of an enclosure accommodates a drawer as well as functioning as a system for isolating from active service, allowing for safe and easy removal and maintenance of component(s) as located in the enclosure. The control wiring for the closing and tripping circuits has been validated through functional simulation using a test device, and the following indications have also been verified: spring charger status, breaker ON/OFF (machine ON)/tripping status and breaker status/errors prior to shipment.

These ACBs operate in US power distribution systems, the ACBs are designed to operate at high levels of fault and operate multiple applications of transferring load between feeders, and provide coordinated and clear-fault protective coordination while providing racks for removal of each ACB without interruption of power to the entire board.