In a common standard configuration, the emergency power system comprises a so-called "dual circuit breaker control system," where two switchboard panels, each equipped with a circuit breaker for connection to the grid and an emergency generator, are configured and supplied with the corresponding SYMAP® generator protection and control unit. In an emergency power system, the grid voltage is constantly monitored. In the event of a grid failure, the generator starts with a short delay. As soon as the generator supplies voltage, the grid breaker opens, followed by the closing of the generator breaker. During emergency power operation, consumers are supplied with stable frequency and voltage. Once the system detects a return of grid voltage on all three phases of the grid feed-in, it automatically switches from emergency power operation to grid operation with a delay, but without interrupting the power supply.
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