a.
Voltage [208] [380] [400] [480] [_____] volts line-to-line.
b.
Number of phases:
3-phase, 3-wire, plus ground.
c.
Voltage Range: Plus 10 percent, minus 15 percent, without
affecting battery float voltage or output voltage.
d.
Frequency:
[50] [60] Hz, plus or minus 5 percent.
e.
Power walk-in:
20 percent to 100 percent over 15 to 24 seconds.
f.
Total harmonic current distortion (THD) reflected into the primary
line: [5] [10] percent maximum.
g.
Transformer sub-cycle inrush:
4 to 8 times full load rating.
2.3.7
ac Output
**************************************************************************
NOTE: If the output voltage is 120/208 V and the
same voltage is not available for the static bypass
and maintenance bypass, a transformer will be
required in the bypass distribution system. Delete
load sharing and redundant module for single module
systems.
**************************************************************************
a.
Voltage [208] [380] [400] [480] [_____] volts line-to-line, [120]
[220] [277] [_____] volts line-to-neutral.
b.
Number of phases:
3-phase, 4-wire, plus ground.
c.
(1)
Balanced load:
Plus or minus 1.0 percent.
(2) 50 percent load imbalance, phase-to-phase:
Plus or minus 2
percent.
(3)
No-load voltage modulation:
Plus or minus 1 percent.
(4) Voltage drift: Plus or minus 1 percent over any 30 day
interval (or length of test) at stated ambient conditions.
d.
Voltage adjustment:
Plus or minus 5 percent manually.
e.
Frequency:
[50] [60] Hz.
f.
Frequency regulation:
Plus or minus 0.1 percent.
g.
Frequency drift: Plus or minus 0.1 percent over any 24 hour
interval (or length of test) at stated ambient conditions when on
internal oscillator.
h.
Harmonic content (RMS voltage): 3 percent single harmonic,
maximum; 5 percent total maximum with linear load. Voltage THD
shall be less than 7 percent with up to 50 percent nonlinear load
and a crest factor of less than 3 to 1.
SECTION 16265A
Page 18
Previous Page
