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Liquid Filled Secondary Substation Transformers
Liquid Filled
Secondary Substation
Transformers kVA
SPECIFYING
TRANSFORMERS
The available incoming power sup-
ply determines the primary voltage and
the frequency of the transformer. The
voltage that is required by the load
determines the secondary voltage.
Present load, plus allowance for
growth, determines the kVA rating of
the transformer. Transformers with
specific combinations of voltages and
kVA ratings are available as standard
designs.
All secondary substation trans-
formers are three-phase, 60 Hz, with
high-voltage windings delta-connect-
ed. Transformers are also available in
50 Hz designs.
STANDARD kVA
RATINGS
225 kVA
1000kVA
300 kVA
1500 kVA
500 kVA
2000 kVA
750 kVA
2500 kVA
3000kVA
The standard kVA ratings are
based on a 65
o
C average winding
temperature rise by resistance
above a 30
o
C average ambient.
STANDARD PRIMARY
VOLTAGE RATINGS
All Delta:
2400 Volts*
12000 Volts
4160 Volts
12470 Volts
4800 Volts
13200 Volts
6900 Volts
13800 Volts
7200 Volts
*Not available above 1500 kVA.
Primary voltage ratings are supple-
mented with four approximately 2
1
/
2
-
percent full-capacity taps, two above
and two below normal. This combina-
tion allows compensating for either a
higher or a lower than normal sus-
tained primary voltage.
STANDARD SECONDARY
VOLTAGE RATINGS
208Y/120*
240*
480
480Y/277
* Not available above 1500 kVA
Secondary voltage ratings are
approximately 4.2 percent above the
standard motor voltages (460 and 230
volts), allowing for voltage drop in the
line between the substation and the
motor terminals without operating the
motor at subnormal voltage. Motors
and control operate satisfactorily on
voltages 10 percent above or below
rating.
Secondary lighting voltages are
standardized at the voltage rating of
the lamps (120 volt). Operating volt-
age is fairly critical to lamp
performance. Overvoltage causes
overheating and subsequent short life
of lighting equipment, while under-
voltage reduces illumination output
and may have adverse effects on the
operation of fluorescent lamps. The
120-volt rating for lighting transform-
ers normally gives the best results. If
the regulation is then too great, it is the
usual practice to correct it with a small
voltage regulator installed on each
feeder.
2
2400
4160
4800
6900
7200
12000
12470
13200
13800
208
240
480
600
112.5
27.1
15.6
13.5
9.4
9.0
5.4
5.2
4.98
4.7
312
271
135
108
150
36.1
20.8
18.0
12.6
12.0
7.2
6.9
6.6
6.3
416
361
18.
144
225
54.1
31.2
27.1
18.8
18.0
10.8
10.4
9.8
9.4
625
541
271
217
300
72.2
41.6
36.1
25.1
24.1
14.4
13.9
13.1
12.6
833
722
361
289
500
120
69.4
60.1
41.8
40.1
24.1
23.1
21.9
20.9
1388
1203
601
481
750
180
104.1
90.2
62.8
60.1
36.1
34.7
32.8
31.4
2082
1804
902
722
1000
241
139
120
83.7
80.2
48.1
46.3
43.7
41.8
2776
2406
1203
962
1500
361
208
180
126
120
72.2
69.4
65.6
62.8
4164
3608
1804
1443
2000
278
241
167
160
96.2
92.6
87.5
83.7
2406
1925
2500
347
301
209
200
120
116
109
105
3007
2406
3000
416
361
251
241
144
139
131
126
3608
2887
PRIMARY
LINE-TO-LINE VOLTS
SECONDARY
LINE-TO-LINE VOLTS
GE Prolec Transformers Meet
Latest Applicable Standards of
ANSI and NEMA
TABLE OF LINE CURRENTS 3
APPROXIMATE WEIGHT (Lbs.), VOLUME (Gallons), AND
DIMENSIONS (Inches)
(Silicone Filled; 65
o
C Rise; HV Copper; LV Aluminum)
KVA*
Height
Flange to Flange
Depth
Oil
Weight
750
98
49
66
220
6,900
1,000
98
54
70
310
8,200
1,500
98
58
74
320
9,700
2,000
98
60
80
360
11,900
2,500
98
62
88
410
13,400
3,000
99
65
104
490
15,900
APPROXIMATE WEIGHT (Lbs.), VOLUME (Gallons), AND
DIMENSIONS (Inches)
(Oil Filled; 55/65
o
C Rise; HV Copper; LV Aluminum)
KVA*
Height
Flange to Flange
Depth
Oil
Weight
750
94
49
66
240
7,000
1,000
94
54
66
310
8,400
1,500
94
58
72
360
10,000
2,000
94
60
88
400
12,100
2,500
96
62
96
420
13,700
3,000
99
65
104
490
16,100
APPROXIMATE WEIGHT (Lbs.), VOLUME (Gallons), AND
DIMENSIONS (Inches)
(Silicone Filled; 55/65
o
C Rise; HV Copper; LV Aluminum)
KVA*
Height
Flange to Flange
Depth Silicone Weight
750
98
49
70
230
7,100
1,000
98
54
72
320
8,600
1,500
98
58
91
330
10,100
2,000
98
60
96
370
12,300
2,500
99
62
104
430
14,000
3,000
99
65
110
500
16,400
Dimensions and weights are approximate for kVA, 15kV Class, 95 kV BIL and normal service conditions.
Flange to flange dimensions may decrease slightly for Class units, with LV of 5 kV.
Dimensions may vary with special requirements.
* For KVAs not listed, contact the factory.
Dimensions
and Weights
APPROXIMATE WEIGHT (Lbs.), VOLUME (Gallons), AND
DIMENSIONS (Inches)
(Oil Filled; 65
o
C Rise; HV Copper; LV Aluminum)
KVA*
Height
Flange to Flange
Depth
Oil
Weight
750
94
49
66
220
6,800
1,000
94
54
66
300
9,000
1,500
94
58
70
350
9,600
2,000
94
60
72
360
10,500
2,500
95
62
86
400
13,000
3,000
99
65
94
480
15,600
HV Coordinations: Power Vac HV Air Switch Busduct
OR
OR
Optional
HV Air
Terminal
Compartment
(Heaters and
Arresters
Available)
90
Height
90
Optional
LV Air
Terminal
Compartment
(Heaters
Available)
LV Coordinations: AKD-8/AKD-10 Power Break Spectra Busway Switchboard Mebane Switchboard Houston Limit Amp Mebane Motor Control Mebane Busduct
OR
OR
Depth
Cooling Panels
38
38
High Voltage
Low Voltage
Transformer
Front View
Flange to Flange
26
26
Dimensions and weights are subject to change without notice and should not be used for construction purposes. STANDARD IMPEDANCES
kVA
Percentage
Impedance
225
2.0*
300-500
4.5*
750-3000
5.75 * Minimum impedance
5.5% above 600V LV
AUDIO SOUND LEVELS
All transformers have an inherent
sound caused by the alternating mag-
netic flux in the core. The sound
level is proportional to the kVA size
of the transformer. There are a vari-
ety of options to compensate for
sound issues. For example:
1. Strategically locate sites to
minimize noise issues.
2. Use flexible conduit connections
to prevent sound from being
transmitted to other locations.
Use auxiliary vibration dampers
when appropriate.
3. Design transformer rooms so that
they will minimize sound.
4. Install the transformer away from
smooth surfaces, hallways, stair-
ways, and enclosures which may
reflect, resonate, or echo the
sound.
STANDARD SOUND LEVELS
SELF
WITHOUT
WITH FANS
COOLED
FANS
RUNNING
RATING kVA
300 & LESS
55
. .
500 56 .
.
750 58 67
1000 58 67
1500 60
67
2000 61 67
2500 62 67
3000 63 67
PROVISION FOR FAN
COOLING
Cooling fans will increase the
transformers capacity by 15 percent
(750-2499 kVA) and 25 percent
(2500-3000 kVA).
Includes:
1. Capacity in all current-carrying
parts for fan-cooling rating.
2. Thermometer relay to control fan
from liquid temperature.
Typical
Low-
System
BIL
Insulation
frequency
Impulse Test
Voltage
Classs
Test
Chopped Wave
Full Wave
Min. Time to
kV
kV
kV
kV
Kv
Flashover,
kV Crest
Crest
Micro-
Seconds
1.2
30
1.2
10
36
1.0
30
2.4
45
2.5
15
54
1.5
45
4.8
60
5
19
69
1.5
60
8.32
75
8.7
26
88
1.6
75
14.4
95
15
34
110
1.8
95
4
Electrical And Mechanical
Characteristics 5
Delta-connected primary windings
are provided in standard secondary
substation transformers. This is the
simplest and most satisfactory connec-
tion.
Wye-connected secondary wind-
ings gain the advantages of neutral
grounding in the most practical and
economical manner.
DESIGN
Thorough analysis by GE Prolec
designers incorporate many new fea-
tures utilizing state of the art
technology. The result: high mechani-
cal and electrical strength necessary to
meet the latest ANSI C57.12.90. This
is the standard test code and guide for
short-circuit testing of transformers.
Liquid-filled transformers are
available with three types of dielectric
fluid: oil, silicone and R-TEMP or
equal. All types are enclosed in sealed
tanks to keep the internal elements
free from dirt, moisture and corro-
sive atmospheres.
OIL-FILLED
The oil-filled unit is the least
expensive transformer, and is suit-
able for mounting outdoors or
indoors enclosed in a vault.
The oil used in GE Prolec trans-
formers meets all the requirements
of ANSI C57.106 and ASTM D-
3487, has high dielectric strength, is
free from impurities, is durable and has
a high flash point. These features
make it an excellent insulating liquid.
SILICONE-FILLED
The silicone fluid selected for use
in GE Prolec transformers is a clear,
liquid silicone polymer (polydimethyl-
siloxane) that has been specially
processed to meet exacting dielectric
specifications. To obtain an optimum
combination of heat transfer and fire-
resistant properties, the transformer
silicone fluid has a viscosity of 50 cen-
tistokes at 25
o
C. This fluid has a
minimum fire point of 300
o
C and oxy-
gen index of 21.
The silicone fluid that we are using
meets paragraph 450-23 (Less-
Flammable Liquid-Insulated
Transformers) of the Nat