Emergency power supply for a temporary power supply in Africa
In many African countries, the power supply and stability cannot be compared with the situation in Germany. It can happen that some areas / districts do not have a stable power supply for several hours. To ensure the logistics and the processes of the temporary power supply, 5 emergency power gensets are installed, which can guarantee the emergency power supply for several days. With an additional function, the emergency power supply units can also be operated in permanent island mode. In this functional application, the temporary power is supplied by the emergency power gensets.
A power failure can have many different reasons
Defective transformer at the utility company or at the end customer
Short circuit / earth fault
Defective power cable / joints
Defect in the substation / relay station
Defect of electrical components in own electrical installation
The power part is designed for a rated current of 722A. A 3WL breaker from Siemens is installed as a generator breaker.
Generator circuit breaker:
Breaker type = circuit breaker (protection via secondary tripping)
Poles = 3-pole
Rated current = 1000 A
Rated breaking capacity = 50 kA
Design = fixed installation
Motor drive = 230 VAC
Closing release = 230 VAC
Shunt release = undervoltage release 24 VDC
The mains circuit breaker to be controlled is located in the customer's low voltage main distribution board.
The emergency power gensets and the genset controls are located in different rooms. A remote panel has been installed on the emergency power genset for convenient operation and monitoring of the system status. The most important operating states can be initiated and monitored via the remote panel.
Mode of operation:
Each of the emergency power gensets are responsible for a separate low voltage main distribution. Normally, the consumers are supplied via the mains supply. If a mains failure is detected, the emergency power genset is started and after reaching the nominal values (400 VAC / 50 Hz) the mains circuit breaker is opened and the generator circuit breaker is closed. The consumers are supplied by the genset
After the mains voltage has returned and the adjustable mains stability time has elapsed, the emergency power genset is adjusted to the frequency and voltage of the mains incomer, the mains circuit breaker is switched on again synchronously with the unit, and the generator circuit breaker is switched off.
If you have any questions regarding this application or other concepts, our technical sales team will be happy to assist you.