Page 84 - E24 Electrical Notebook

80 - Dynamic Diesel UPS - Technical Data

Available Standard Specification (*The DUPS solution can be tailored to site specific requirements)

Input Voltage: 380-415V, 50Hz General Altitude 300m AMSL*
440-480V, 60Hz 40 Deg C*
Voltage Tolerance: Up to 11kV direct connection (via Tx to 33kV) Ambient 0-95%*
Power Factor: +/- 10% (+/- 20% option) Relative Humidity IP23*
THID: >0.98 0-100% load Protection >1,000,000 hours
<2% (Meets G5/4) Reliability

Output Voltage Static: +/- 1.0%

Voltage Dynamic*: a) + 10% Load Change Maximum voltage drop + 1.5%
+ 30% Load Change Maximum voltage drop + 3.0%

+ 50% Load Change Maximum voltage drop + 5.0% Recovery Time
+ 100% Load Change Maximum voltage drop + 10.0% <0.2 sec

b) Short circuit on incoming feeder +/- 10%

Frequency: a) During mains operation = mains frequency
b) Mains failure to diesel engine operation with 100% active load
c) Static - during diesel engine operation +1%
+0.2%

Overload Capacity: 10% of rated load for a period of 1 hour
25% of rated load for a period of 10 minutes
50% of rated load for a period of 2 minutes

Power Factor: 0.8
Efficiency: up to 97%
Short Circuit Capacity: >15 FLC
Load Crest Factor: Unlimited

Unbalanced Load Capability: 100%

The input stabilising filter system also includes the coupling choke; this connects the input grid supply with the UPS high quality output supply. It allows
large voltage differences between both AC systems by means of reactive currents for any direction, independent of the active power flow. The special
design of the choke provides a high degree of decoupling in both directions between the input and output.

The input current consists only of the sinusoidal fundamental waveform required for power transfer. Likewise, harmonics and transients in the input voltage
have no effect on the quality of the output voltage. This independence is achieved through the calculated combination of the coupling choke high impedance
characteristics to harmonic currents and the special design synchronous machine windings and selective damper cage representing a short circuit to
these harmonics, preventing reflection to the mains supply.

Hence the coupling choke provides: I Real I Load (apparent)
I Fundamental
• Static & Transient voltage decoupling of the input mains & the UPS Bus Vin +/- 10% I Reactive
• Harmonic filtering I Harmonic
• Input load levelling irrespective of 100% unbalanced output load 3rd, 5th...
• Input power factor correction >0.98 from 0-100% load at nominal
V Alternator V Out
voltage

In the event of input short circuit the current flow towards the grid network
is limited by the choke at <200% I nominal until the input is disconnected.
During this transient situation the coupling choke maintains the UPS bus
voltage, ensuring all kinetic stored energy can be fully utilised for
supporting the critical load.

Hitzinger UK Ltd Tel : +44 (0) 1732 529 641
50 Churchill Square Fax : +44 (0) 1732 529 642
West Malling
Kent Email : info@hitzinger.co.uk
ME19 4YU Website : www.hitzinger.co.uk