The combined NBDK system was developed by HITZINGER to supply both UPS load and EPS load with just one genset.
This system supplies without any loss of quality both the critical consumer within the specified tolerances and the consumer during emergency power operation.
Functional descriptionDuring grid operation (Stand By Betrieb) the consumer are supplied via the choke by the grid.
The necessary energy is stored in the kinetic module.
Choke and alternator operate as a stabilizing voltage filter and supply the consumer with clean energy and reactive load.
The non-critical emergency power consumer are supplied directly from the grid.
At grid failure the grid-power-switch opens and the UPS load is basically supplied without any interruoption with the energy which is stored in the KIN.
The diesel engine starts, Die Dieselmaschine startet, the electromagnetic clutch is shutted with over excitement and accelerates the diesel engine upt to the nominal speed.
After a short time the nominal speed of the diesel engine is reached and the diesel takes over the the suplly of the UPS load. (Frequency notch < 1%) and the storage of energy of the flywheel.
When this has happened and the suplliance of the UPS load is stable (after 10-15 sec.) also the non-critical supplier are switched on.
Technical Data
Voltage
| Static:: | +1% |
| | |
| Dynamic: |
a) at change of nominal load, cos-phi = 0,8,: +10%, voltage comeback within 0,3 seconds.
b) Short circuit at the input +/- 10%. Voltage tolerance after short circuit shut down <10% within: 0,3 seconds.
c) Mains shutdown at nominal voltage +/-10% within 0,3 seconds
|
| | |
| Frequency: |
a) at grid operation = grid frequency.
b) change grid to diesel operation at takeover of 100 % load +5%.
c) static – at diesel operation +0,5%.
|
In emergency power mode the interruption time is app. 10-15 sec.
When desired other tolerance values are possible! |
