3.2

Emergency Switchboard

In normal situation, the Emergency switchboard is energized from Main switchboard. When the voltage of the MSB fails the tie-breaker between MSB and ESB is automatically disconnected, the emergency generator set is automatically started and the emergency switchboard is energized automatically after a total delay of max. 45 seconds (allowing for stand-by generator to connect first). When MSB voltage restored, the emergency generator will be automatically disconnected, and then stopped with time delay. The ESB will be renewably energized by MSB via the reconnection of the bus tie-breaker.

Normally there is now power feed-back to the main switchboard in any occasion. Alternatively the emergency generator can be also used as harbour generator when required. In this case a select switch “Normal / Harbour” will be additionally furnished. In “Harbour” mode, the emergency generator is able to inversely supply the power to main switchboard.