Guide Specification – 3-Phase Static Uninterruptible Power Supply
March 2009
9
Rated Load Power Factor
: 0.9 PF lagging
Overload Capacity
: 125% for 2 min.,
150% for 1 min.
Harmonic Voltage Distortion
: 2% maximum THD (100% Linear Load)
: 5% maximum THD (100% Non-linear Load)
Phase Displacement
: 1° Maximum at 100% load
Voltage Transients:
100% Load Step Change
: +/-2% Maximum (Without battery assistance)
Loss or Return of Input
: +/-1% Maximum
Transfer from Bypass to Inverter : +/-5% Maximum
(At Bypass Rated Voltage)
Recovery Time
: 20 ms
Crest Factor
: 2.3
5
FUNCTIONAL DESCRIPTION
The UPS shall protect the load against surges, sags, undervoltage, and voltage fluctuation. The
UPS shall have built-in protection against permanent damage to itself and the connected load for
all predictable types of malfunctions. The load shall be automatically transferred to the bypass
line without interruption in the event of an internal UPS malfunction. The status of protective
devices shall be indicated on a LCD graphic display screen on the front of the UPS.
5.1
IGBT Rectifier
5.1.1 General
A solid-state, multi-level IGBT Rectifier shall convert the incoming AC power into DC
power to supply the inverter input and system battery.
5.1.2 Voltage Regulation
The rectifier output voltage shall not deviate by more than +/- 1.0% RMS under the
following conditions:
0% - 100% loading (balanced and unbalanced non-transient loading)
+15% – 20% utility voltage change
+/-10.0% utility frequency change
5.1.3 Reflected Harmonic Content
Input current THD shall be
3% maximum at 60%-100% load
6% maximum at 25%-59% load.
5.2
IGBT DC-DC Converter
5.2.1 General
A solid-state IGBT Battery Converter/Charger shall control battery charging.
5.2.2 Battery Charge Current Limit
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