Recommended Protection - MGE UPS Systems Galaxy PW 30 kVA Installation Manual

Recommended protection

protection upstream of
Galaxy PW
The information provided here is purely
indicative, for a single-UPS unit
supplied by a 380 to 415 V, 50 to 60 Hz
distribution system. Check that all the
criteria mentioned in the previous
section are taken into account (short-
circuit current and protection of the
static-switch semiconductors on the
bypass AC input).
Protection downstream of
Galaxy PW
These protection devices ensure
discrimination for each of the Galaxy
PW output circuits. If the recommended
downstream protection is not installed
and a short-circuit occurs, the result
may be a break longer than 20 ms on
all the other output circuits.
Electrical parameters for determining cable cross-sections
this table has been drawn up for
rated phase-to-phase AC source and
load voltages of 400 V. For voltages of
380 V or 415 V, multiply the currents for
the bypass AC source and the load by
1.05 and 0.96 respectively;
Parameters for cables for a single-UPS unit
Rated UPS Line currents absorbed in Amps
output Normal AC source
in kVA with or
without battery (1)
20 33
30 49
40 66
50 83
60 100
80 133
100 166
120 199
160 262
200 329
(1) The rated normal AC source currents (In) have
been determined for a minimum float charging
voltage of 423 V and full rated load with a power
factor of 0.8.
Ratings of recommended protection devices upstream of a single-UPS unit
(Merlin Gerin circuit breakers)
Rated UPS Circuit breaker on normal
output AC input
in kVA Circuit breaker
20 NS 100N 3P
30 NS 100N 3P
40 NS 100N 3P
50 NS 100N 3P
60 NS 125E 3P
80 NS 160N 3P
100 NS 250N 3P
120 NS 250N 3P
160 NS 400N 3P
200 NS 400N 3P
Ratings of recommended protection devices downstream of a single-UPS unit
(Merlin Gerin circuit breakers)
Rated UPS Downstream circuit
output breaker(s)
in kVA Circuit breaker Control unit
20 to 40 kVA C60N
50 to 60 kVA C60N
80 to 120 kVA C60N
NC100
160 to 200 kVA NC100
the current values and cable cross-
sections for the normal AC source are
given for full rated load with a power
factor of 0.8 and a battery consuming
its minimum float charging voltage.
the battery current values and cable
cross-sections have been determined
for a battery at the end of discharging;
400 V Battery
bypass AC
source and load
29 52
43 72
58 103
72 128
87 154
116 205
144 256
174 308
231 410
289 512
(2) the cable cross-sections are given for copper
conductors (increase by 30% for aluminium
conductors). They are calculated according to
permissible temperature rise and allow for line
voltage drops over a maximum length of 100 m
(AC circuits) or 25 m (DC circuits if cables not
Characteristics (cont.)
Circuit breaker on bypass
AC input
Control unit Circuit breaker
TM 63D NS 100N 4P
TM 63D NS 100N 4P
TM 80D NS 100N 4P
TM 100D NS 100N 4P
TM 125D NS 125E 4P
TM 160D NS 160N 4P
TM 200D NS 250N 4P
TM 250D NS 250N 4P
STR 23 SE NS 400N 4P
STR 23 SE NS 400N 4P
C 10A
B 20A
C 20A
B 32A
C 50A
B 63A
C 63A
B 100A
the current values and cable sections
for the bypass AC source and load are
given for full rated load with a power
factor of 0.8.
For frequency converters, the
parameters concerning the bypass AC
source are not applicable.
Cross-sectional area of Cu cables in mm
Normal AC source 400 V
with or without battery bypass AC
source and load
16 16
25 25
35 35
50 35
50 50
95 or 2x50 70
95 or 2x50 70
95 or 2x50 70
95 95
120 120
provided). For greater lengths, the cross-sections
should be chosen to limit voltage drops to 3% (AC)
or 1% (DC).
Control unit
TM 63D
TM 63D
TM 80D
TM 100D
TM 125D
TM 160D
TM 200D
TM 250D
STR 23 SE
STR 23 SE
2 (2)
Battery
16
25
35
50
70
95 or 2x50
2x70
2x70
2x95
2x95
- 7
E-51028231XU/BH