ABB 3BHE024577R0101 PPC907BE PP C907 BE Module

ABB 3BHE024577R0101 PPC907BE PP C907 BE Module

The priority calculated by the primary load shedding is compared with the calculation of the thermal load shedding and manual load shedding. The commands which result in the shedding of the largest amount of load are passed to the substations. The shed commands are sent to the substation nodes, using a fast communication PC-element, to make sure that the time between detecting a circuit breaker position change in the central node and opening a substation motor breaker does not exceed the stability requirements.

Power measurements from the generator circuit breakers, a public power company incoming circuit breakers, and the substation feeder circuit breakers are taken from the metering and monitoring function module and delayed for 2 seconds to assure stability when shedding. Nominal power is calculated by adding a fixed value or a percentage to the actual generator power to represent the generator's ability in catching up when the load is increased.

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