GE AKD-10 - Page 29

28
M
ain Feeder circuit breakers
Fully rated or Zone
s
elective Selective selective Fully rated
T
able 28.2
6
00 volts, three phase
Transformer
r
ating 3-phase Max short-circuit Full load
S
hort-circuit rating sym current (A)
kVA and MVA available continuous Long-time inst. Long-time
impedance from primary current Transformer 100% or long-time Long-time short-time Long-time
p
ercent system (amperes)
À Â
a
lone Motor load Combined short-time
À
s
hort-time inst. inst.
50 8700 10600
100 9600 11500
500
1
50 481 10000 11900
4
.5%
Á
250 Â (674) 10200 1900 12100 WPS-08 WPS-08 WPS-08 WPS-08
500
10500 12400
7
50 10500 12400
U
nlimited
10700 12600
50 10000 12900
100 11100 14000
7
50
1
50 722 11500 14400
5
.75%
250
 (1010) 11900 2900 14800 WPS-08 WPS-08 WPS-08 WPS-08
500 1
2200 15100
750 12300 15200
Unlimited 12600 15500
50 12400 16200
100 14300 18100
1000
150 962 15000 18800
5.75%
250
 (1347) 15600 3800 19400 WPS-16 WPS-08 WPS-08 WPS-08
500 16200 20000
750 16400 20200
Unlimited 16700 20500
50 16500 22300
100 19900 25700
1500
150 1443 21400 27200 WPS-08 WPS-08 WPS-08
5.75%
250
 (2021) 22700 5800 28500 WPS-16
500 23900 29700
750 24300 30100
WPH-08 WPH-08 WPH-08
Unlimited 25100 30900
50 19700 27400 WPS-08 WPS-08 WPS-08
100 24800 32500
2000
150 1925 27200 34900
5.75%
250
 (2694)
29400 7700 37100 WPS-20 WPH-08 WPH-08 WPH-08
500 31300 39000
750 32000 39700
Unlimited 33500 41200
50 22400 32000
100 29200 38800 WPH-08 WPH-08 WPH-08
2500
150 2406 32400
42000
5.75%
250
 (3368) 35600 9600 45200 WPS-32
500 38500 48100 WPX-08 WPX-08 WPX-08
750 39500 49100
Unlimited 41800 51400 WPH-16 WPH-16 WPH-16
50 24600 36100 WPH-08 WPH-08 WPH-08
100 33000 44500
WPX-08 WPX-08 WPX-08
3000
150 2887 37200 48700
5.75%
250
 (4041) 41500 11500 53000 WPS-32
500
45500
57000
WPH-16 WPH-16 WPH-16
750 46900 58400
Unlimited 50200 61700
50
27200
41600
WPH-08
WPH-08
WPH-08
100 38000 52400
3750
150 43700 58100 WPH-16 WPH-16 WPH-16
5.75%
250 3608 49800 14400 64200 WPS-40
500
 (5051) 55500 69900
750 57700 72100 WPH-32 WPH-32 WPH-32
Unlimited
62800
77200
50 30500 49700
WPX-08 WPX-08 WPX-08
100 44800 64000 WPH-16 WPH-16 WPH-16
5000
150
53000
72200
WPH-32 WPH-32 WPH-32
5.75%
250 4811 62100 19200 81300 WPS-50
500 71300 90500
750
 (6735) 75000 94200
Fused
Fused
Fused
Unlimited 83700 102900
breaker breaker breaker
À With transformer operating on base temperature rise, without fans. Larger frame size main
br
eaker may be required when dual temperature rise for forced cooled transformers are used.
Á Minimum impedance.
 Maximum forced cooled rating indicated in parentheses.
L = Long-time delay trip (overload tripping)
S
= Short-time delay trip (selective fault tripping)
I
=
Instantaneous trip (high fault current fast tripping)
S
elf-cooled
T
ransformer type kVA % increase with fans
L
iquid filled: 65° C rise 750-2000 15%
2
500-5000 25%
L
iquid filled: 55/65° C rise 750-2000 15% (fans) + 12% (65° C)
2500-5000 25% (fans) + 12% (65° C)
V
entilated dry 750-2500 33%
C
ast coil 500-2500 40%
3
000-5000 25%
LS
L
S LSI LI
LI
LI
D
istribution or motor control center
Table 28.1 Transformer forced cooled ratings
Fully rated
a
rrangement
S
electively
coordinated
a
rrangements