Liquid Filled 
Secondary Substation 
Transformers 

SPECIFYING 
TRANSFORMERS 
The available incoming power supply 
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 transformers 
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 65oC average winding 
temperature rise by resistance 
above a 30oC 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 supplemented 
with four approximately 21/2 percent 
full-capacity taps, two above 
and two below normal. This combination 
allows compensating for either a 
higher or a lower than normal sustained 
primary voltage. 
STANDARD SECONDARY 
VOLTAGE RATINGS 
**
208Y/120240
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 voltage 
is fairly critical to lamp 
performance. Overvoltage causes 
overheating and subsequent short life 
of lighting equipment, while undervoltage 
reduces illumination output 
and may have adverse effects on the 
operation of fluorescent lamps. The 
120-volt rating for lighting transformers 
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. 
PRIMARY SECONDARY 
kVA LINE-TO-LINE VOLTS LINE-TO-LINE VOLTS 
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 
TABLE OF LINE CURRENTS

Cooling Panels 
38” 
Depth 
38” 
Flange to Flange 
HV Coordinations: 
• Power Vac 
• HV Air Switch 
• Busduct 
OR 
Optional 
HV Air 
Terminal 
Compartment 
(Heaters and 
Arresters 
Available) 
90” 
OR Height OR 
90” 
Optional 
LV Air 
Terminal 
Compartment 
(Heaters 
Available) 
OR LV Coordinations: 
• AKD-8/AKD-10 
• Power Break 
• Spectra Busway 
• Switchboard Mebane 
• Switchboard Houston 
• Limit Amp Mebane 
• Motor Control Mebane 
• Busduct 
26” 26” 
High Voltage Transformer 
Front View 
Low Voltage 
Dimensions and weights are subject to change without notice and should not be used for construction purposes. 
APPROXIMATE WEIGHT (Lbs.), VOLUME (Gallons), AND 
DIMENSIONS (Inches) 
(Oil Filled; 65oC 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 
APPROXIMATE WEIGHT (Lbs.), VOLUME (Gallons), AND 
DIMENSIONS (Inches) 
(Silicone Filled; 65oC 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; 55/65oC 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; 55/65oC 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. 
* ForKVA’s not listed, contact the factory. 

Percentage 
Impedance 
225 2.0* 
300-500 4.5* 
750-3000 5.75• 
STANDARD IMPEDANCES 
kVA 
* Minimum impedance
• 5.5% above 600VLV 
AUDIO SOUND LEVELS 
All transformers have an inherent 
sound caused by the alternating magnetic 
flux in the core. The sound 
level is proportional to the kVA size 
of the transformer. There are a variety 
of options to compensate for 
sound issues. For example: 
1. Strategically locate sites tominimize noise issues. 
2. Use flexible conduit connectionsto prevent sound from being 
transmitted to other locations. 
Use auxiliary vibration dampers 
when appropriate. 
3. Design transformer rooms so thatthey will minimize sound. 
4. Install the transformer away fromsmooth surfaces, hallways, stairways, 
and enclosures which may 
reflect, resonate, or echo the 
sound. 
STANDARD SOUND LEVELS 
SELF 
COOLED 
RATING kVA 
WITHOUT 
FANS 
WITH FANS 
RUNNING 
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-carryingparts for fan-cooling rating. 
2. Thermometer relay to control fan 
from liquid temperature. 
Low-
System BIL Insulation frequency 
Classs 
kV kV kV kV Kv 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 1.5 60 
8.32 75 8.7 26 88 1.6 75 
14.4 95 15 34 1.8 95 
Typical 
Impulse Test 
Voltage Test Chopped Wave Full Wave 
Min. Time to 
Flashover, 
19 69 
110 

2400 
4160 
4800 
6900 
7200 
12000 
12470 
13200 
13800 
Primary 
H2 
H3H1 
Secondary 
X2 
X1 
X3 
XN 
208Y/120 three- or four-wire 
480/277 three- or four-wire 
Delta-Delta connections 
2400 
4160 
4800 
6900 
7200 
12000 
12470 
13200 
13800 
Primary 
H2 
H3H1 
Secondary 
X2 
X3X1 
240 three wire 
480 three wire(Three Wire) 
(Three Wire) 
Voltage Delta-Wye connections Voltage 
Liquid- Filled Impulse Ratings 
Nominal 
SYSTEM 
Voltage, kV 
Standard 
BIL, kV 
Optional 
BIL, kV 
1.2 
2.5 
5 
8.7 
15 
30 
45 
60 
75 
95 
45 
60 
75 
95 
110 
Delta-connected primary windings 
are provided in standard secondary 
substation transformers. This is the 
simplest and most satisfactory connection. 
Wye-connected secondary windings 
gain the advantages of neutral 
grounding in the most practical and 
economical manner. 
DESIGN 
Thorough analysis by GE Prolec 
designers incorporate many new features 
utilizing state of the art 
technology. The result: high mechanical 
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 corrosive 
atmospheres. 
OIL-FILLED 
The oil-filled unit is the least 
expensive transformer, and is suitable 
for mounting outdoors or 
indoors enclosed in a vault. 
The oil used in GE Prolec transformers 
meets all the requirements 
of ANSI C57.106 and ASTM D3487, 
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 (polydimethylsiloxane) 
that has been specially 
processed to meet exacting dielectric 
specifications. To obtain an optimum 
combination of heat transfer and fireresistant 
properties, the transformer 
silicone fluid has a viscosity of 50 centistokes 
at 25oC. This fluid has a 
minimum fire point of 300oC and oxygen 
index of 21. 
The silicone fluid that we are using 
meets paragraph 450-23 (Less-
Flammable Liquid-Insulated 
Transformers) of the National 
Electrical code. OSHA by its Program 
Directive 100-68 permits the use of silicone 
transformers as equivalent to 
askarel transformers in its enforcement 
of the National Electrical Code. 
Transformer silicone fluid has suitable 
dielectric characteristics, is 
compatible with other materials used 
in construction of transformers, and 
has shown good thermal stability in 
accelerated aging tests with transformer 
materials. 
LESS-FLAMMABLE 
DIELECTRIC LIQUID 
R-TEMP OR EQUIVALENT 
A Fire Resistant Hydrocarbon Fluid 
(FRHF) dielectric coolant formulated 
for use in distribution transformers is 
available when its unique electrical, 
thermal and safety properties are 
advantageous. It is non-toxic and readily 
biogradable. It is also referred to as 
a High Fire Point Fluid, a High 
Molecular Weight Hydrocarbon or a 
Less-Flammable Dielectric Liquid. 
The dielectric coolant is a listed 
less-flammable fluid meeting the 
requirements of National Electrical 
Code Section 450-23, including a minimum 
fire point of 300oC and the 
requirements of the National Electrical 
Safety Code (IEEE C2-1993), Section 
15. 

CORE-AND-COIL 
CONSTRUCTION 
GE Prolec transformers are built 
with rectangular windings and core. 
The rectangular winding construction 
Film-insulated wire is used because it 
is less bulky than paper, has higher 
dielectric strength on a volts-per-mil 
basis, and does not tend to split or 
crack when small radius bends are 
made. To provide insulation between 
each layer in the high voltage 
windings, an electrical-grade adhe-
sive-coated paper is used. 
After completing the winding 
process the high and low voltage 
coils are clamped to the desired 
dimensions. They are then oven 
baked at a temperature which allows 
the adhesive coating on the paper to 
bond the adjacent conductors and 
wires together. The result is a winding 
structure which has high 
short-circuit strength and high electrical 
stress withstand capability. 
The transformer cores are conreduces 
the size of the tank that structed of non-aging, high grade, 
results in savings in weight and floor grain oriented silicone steel laminaspace 
without compromising tions with high magnetic 
performance and quality. 
permeability. Magnetic flux 
densities are kept well below 
First, the low-voltage coils are 
the saturation point. Core 
wound on a rectangular form that laminations are free of burrs and 
simulates the rectangular core leg assembled without gaps. The 
and serves as the main support for core clamping brackets are 
all the windings. These coils are of designed to provide an even dissheet 
winding construction using tribution of clamping forces to the 
strip conductors. An extra strong core yokes and legs. 
electrical-grade paper is used as the 
insulation between each low-voltage 
turn. 
The high-voltage coils are wound, 
under tension, over the low-voltage 
coils and are of layer-wound construction 
using film-insulated wire. 

LEAK-RESISTANT 
WELDED TRANSFORMER 
TANK CONSTRUCTION 
The tank design incorporates many 
desirable features which assure flexibility 
of location, ease of maintenance 
and installation, and rodent protection. 
The design, in effect, wraps the 
tank around the core-and-coil assembly. 
In so doing, the overall weight is 
reduced by reducing the tank material 
weight as well as the weight of the 
dielectric fluid. 
The underside of the tank is accessible 
from the front and back, and 
allows the free movement of air, which 
helps to keep the underside of the tank 
dry and deter the formation of rust. 
The high and low voltage bolted 
flanges have no openings, which eliminates 
the possibility of rodent access 
to adjacent high and low voltage terminal 
equipment. 
The tank cover is welded-on to 
eliminate contamination in the atmosphere 
from entering the tank. 
Cooling-panels are leak tested during 
the production cycle. 
Sealed tank construction is 
achieved by seam welding formed and 
punched steel plates. Additional 
braces are welded as necessary to the 
side-walls to provide adequate pressure 
and vacuum ratings. Cooling 
panels are welded (removable radiators 
available) to the front and rear 
tank walls. Tanks are designed for 12 
PSI. The tank is leak tested prior to, as 
well as after, coil drying and vacuum 
filling. Secondary substation transformer 
tanks feature side wall high 
voltage and low voltage bushings with 
flanges for connections to HV or LV 
switchgear or air terminal compartments. 
For ease of handling and installation 
sturdy lifting lugs are welded in 
place on each corner for lifting by 
crane. 
BUSHING DESIGN 
The bushing design utilizes bolted 
construction using time-tested gasketing 
techniques and materials which are 
compatible with the liquid dielectric. 
These techniques assure leak-free performance 
for the full life of the 
transformer. 
Both high and low voltage bushings 
are externally removable without 
the necessity of removing the tank 
cover. This enables easy replacement 
of the bushings, should such a replacement 
be required. 
The bolted-on porcelain or epoxy 
bushings are ideally suited for their 
application. 
GE Prolec provides transformers 
designed for standard arrangements or 
reverse arrangement whichever is most 
convient for installation. 

connections is with clamp type ter-B Non-corrosion diagrammatic 
minals (#2-4/0 AWG,250-500 nameplate 
MCM or 600-1000 MCM). B ANSI 61 paint finish, 5 mils thick
6. NEMAtwo hole lugs are available 
upon request. 
Optional Liquid and
7. GE Tranquell Intermediate, 
Distribution, and Station type Features 
arresters are available when specified. 
B Silicone fluid 
B High fire point fluid, such as 
R-TEMP. 
Standard Liquid and B 55/65oC Average Winding Rise 
The base is designed with bolt holes Features B Forced Air Cooling 
for easy tie down. It is constructed B Future Fan Wiring and Control 
for rolling, skidding or sliding in the B Type I Insulating mineral oil B Removable Radiators 
direction of either centerline. 
B 60 Hertz Operation B Pressure Relief Device 
B Externally operated de-energized B Fault Pressure Relay 
tap changer providing (2) 21/2 % B Winding Temperature Device 
Air Terminal Full Capacity taps above and B Devices with alarm contacts 
Compartments below Nominal B Top Filter Press Valve 
B 65oC Average Winding Rise B HV & LV Air Terminal 
1. Terminal boxes can be supplied on B Side-mounted bushings Compartments 
the primary or secondary side of B HV and LV flange connections B HV lightning arresters in ATC 
the transformer. B Pressure-vacuum gauge B Current Transformers 
2. HVterminal boxes are suitable for 
B Top filter press connections B Neutral Grounding Resistor
single or loop feed. 
3. Bolted-on end panel provides easyB Liquid level gauge
access to the cable fittings. B Liquid temperature gauge Special Design or
4. Incoming line cables can enter theB Pressure test valve Application
top or bottom of the terminal box B ANSI Grounding pad
and can be connected with up to 8 B Drain/filter valve with sampling B Special Impedances
cables per phase. 
5. The standard method for cable 
device B Low Loss 
B Tank lifting lugs B Rectifier Transformer 
B Isolation Transformer 
B Special Ambient 
B Special/Low Sound Level 
B 50 Hertz 
B Seismic Zone III and IV 
B Retrofit to Specific Dimensions 
B Non-standard loading conditions 
such as harmonic loading or 
specified K-factor 

The liquid-level gage, dial-type 
thermometer, and pressure-vacuum 
gage are grouped with the nameplate 
so that all are easily readable from 
one floor-level position. 
OPTIONAL 
ACCESSORIES 
Winding Temperature 
Indicator 
The winding temperature indicator 
provides a visual reading of the 
equivalent transformer winding hotspot 
temperature. Similar to the top 
liquid thermometer, the winding temperature 
indicator is located in the 
top liquid. The indicator reads the 
combination temperature of the top 
liquid and a heater. This heater, when 
supplied with current proportional to 
the winding current, is designed to 
closely approximate the winding hotspot 
rise over the top liquid; and thus, 
the indicator reading indicates winding 
hot-spot. 
The indicator comes equipped 
with two sets of contacts which can 
be used for actuating auxiliary 
devices. 
Fault-Pressure Relay 
The fault-pressure relay provides 
a positive and reliable means of 
detecting an excessive rate of pressure 
rise within the tank resulting 
from an internal arc. The relay is 
normally mounted on the transformer 
cover. The relay is equipped with 
one normally open and one normally 
closed momentary contacts; therefore, 
the user must provide for a 
seal-in circuit to operate other 
devices. 
Pressure-Relief Device 
The pressure-relief device is selfreclosing 
and self-resealing. The 
mechanism is set at the factory to 
operate within an accuracy of plus or 
minus 10 percent. 
A pressure-relief device will be 
furnished as a standard accessory on 
all silicone-insulated transformers. 
PAINT FINISH 
Metal surfaces are thoroughly 
cleaned of scale, oil, grease, rust and 
other foreign matter prior to painting. 
They are spray painted with one coat 
of primer. 
An intermediate flow coat of 
enamel is then applied. If the unit is 
for outdoor application a third flow 
coat is applied to give a minimum 
film thickness of five mils. 
Final finishes use an air dry 
enamel which is applied by either the 
hot air spray or conventional cold 
spray methods. 
The standard paint finish color is 
ANSI-Number 61, Light Gray, 
Munsell Notation 8.3G 6.10/0.54. 
STANDARD TESTS 
The following tests will be made 
on all transformers but not necessarily 
in the sequence listed. All tests are 
performed in accordance with the latest 
revision of ANSI Standard Test 
Code for Transformers C57.12.90—-
1980. 
1. Resistance measurements of all 
windings. 
2. Ratio tests on the rated voltage 
connection and on all tap connections. 
3. Polarity and phase-relation tests on 
the rated voltage connection. 
4. No-load loss at rated voltage on the 
rated voltage connection. 
5. Exciting current at rated voltage on 
the rated voltage connection. 
6. Impedance and load loss. 
7. Applied potential tests. 
8. Induced potential tests. 
9. Impulse tests. 

GUIDE FORM SPECIFICATIONS
GENERAL ARRANGEMENT This specification covers a complete three phase secondary substation-type transformer. The 
transformer shall be (Check One) 
(__) Standard Arrangement; When facing the front (nameplate) of the transformer, 
the incoming section shall be on the left and the outgoing section on the right. 
(__) Reverse Arrangement; When facing the front (nameplate) of the transformer, 
the incoming section shall be on the right and the outgoing section on the left. 
RATING Three-phase substation shall have the following self-cooled ratings: 
kVA :__________ 300-3750 kVA with LV rating of <601 volts.
750-5000 kVA with LV rating of >600 volts.
WINDING RISE : (__) 65 degree Centigrade rise…..(Standard). 
(__) 55/65 degree Centigrade rise. Allows for 12% additional capacity when operated at 65 
degree Centigrade. 
FAN COOLING: (__) OA, self-cooled; No fans available <750 kVA.
(__) OA/FFA self-cooled/future fan cooling capacity.
(__) OA/FA, self-cooled / fan-cooled increased capacity: 
(15% additional capacity….750 kVA-2000 kVA)
(25% additional capacity….2500 kVA-5000 kVA)
FREQUENCY: (__) 60 Hertz (Standard) (__) 50 Hertz 
INSULATING FLUIDS: (__) Mineral Oil (__) Silicone (__) High fire point fluid (ex. R-Temp) 
HV Rating: (__) __________ Delta or Wye * 
LV Rating: (__) __________ Wye * or (__) Delta
* HVWye-LV Wye available only for 2500 KVA and below. 
HV BIL: (__) Standard….HV 15 kV Class, 95 kV BIL; 5 kV Class, 60kV BIL
(__) Optional….HV 15 kV Class, 110 kV BIL; 5 kV Class, 75kV BIL
LV BIL: (__) Standard….LV 480 V Class, 30 kV BIL; 5 kV Class, 60kV BIL
(__) Optional….LV 480 V Class, 45 kV BIL; 5 kV Class, 75kV BIL
Impedance: (__) Standard….5.75 % for LV 7 600 V above 501 kVA; 7 501 kVA 
4.5 % Min or 5.50 % for LV 9 600 V and HV BIL = 110kV 
(__) Special _______ 
Note: ANSI allows the tested Impedance to vary 7.5 % above or below the designed Impedance. 

GENERAL CONSTRUCTION 
The liquid insulated, secondary type substation transformer shall be designed, manufactured 
and tested in accordance with the latest ANSI Standards. Impedance, sound 
level and voltage connections shall be in accordance with NEMA Standards. The core 
shall be constructed of high-grade gain oriented silicone steel laminations to reduce 
size, sound and losses. The coils shall be of rectangular construction utilizing extra 
strong, electrical grade, adhesive-coated paper between turns. The core and coil 
assembly shall be installed in a sealed tank, immersed in insulated liquid to prevent 
dirt, moisture and corrosive elements from deteriorating the electrical and mechanical 
integrity of the transformer. Transformer shall have four approximately 2.5 percent 
rated kVA taps, two above and two below rated primary voltage. These taps shall be 
available by means of an externally operated manual tap changer for operation only 
when transformer is de-energized, with provisions for padlocking the tap changer. 
STANDARD FEATURES Windings : HV Cu / LV Al Provisions for lifting and jacking 
Cover vent plug Drain and sampling device 
Top filter-press connection 12-PSI tank 
Liquid level gauge Pressure test valve 
Two tank grounding pads Pressure vacuum gauge 
Anodized aluminum Nameplate Dial type thermometer (liquid) 
Tank hand hole on transformer cover 
Pressure relief device (Silicone units) 
ANSI 61 Gray finish coat paint 
No load tap changer with handle on front wall of transformer 
OPTIONAL FEATURES (__) Windings: All Copper 
(__) Pressure relief device * 
(__) Fault pressure relay * 
(__) Winding temperature indicator * 
(__) Pressure relief device (Oil Units) * 
(__) Liquid level gauge * 
(__) Liquid temperature indicator * (liquid) 
* Device with electrical contacts
INCOMING SECTION (__) HV flange, 90” full-height (Standard) 
(__) Air filled terminal compartment: 26.4”deep and 38.4” wide. 
Compartments are full height. Space heaters standard in outdoor units. 
(__) Coordinated to HV Switch (supplier) _______ 
OUTGOING SECTION (__) LV flange, 90” full-height (Standard) 
(__) Air filled terminal compartment: 26.4” deep and 38.4” wide. 
Compartments are full height. Space heaters standard in outdoor units. 
(__) Coordinated to GE LV equipment _________ 
Includes copper flexible connectors. 
TEST REQUIREMENTS Each transformer shall receive all standard commercial tests in accordance with ANSI 
C57.12.90 (latest revision), with tests report available by serial number of the 
transformer. 
Routine tests include: 
-Resistance measurements of all windings 
-Ratio tests on the rated voltage connection and all tap connections 
-Polarity and phase relation tests on the rated voltage connection 
-No load loss at rated voltage 
-Exciting current at rated voltage 
-Impedance and load loss 
-Applied and Induced potential tests 

GE’s sales organizations and distributor network 
will provide technical sales and service for GE 
Prolec products as they do for all other GEJT&D 
products and systems. GE’s installation and 
service Engineers group, along with it’s network 
of Apparatus Service Centers strategically located 
throughout North America, provide the new joint 
venture with a service network second to none. 
All products manufactured under the JV will 
portray the GE monogram and carry the standard 
GE warranty. 
Look 
Come to Monterrey 
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Standards
ANSI/IEEE
NEMA,
NOM (Mexico)
BRINGING YOU QUALITY, TECHNOLOGY-BASED
TRANSFORMER PRODUCTS...
INDUSTRIAL TRANSFORMERS 
Phone: 1-800-GEPROLEC Fax: 011 528 156 2201 
US Contact (706) 291 3384 (706) 291 3144 
GE Dial Com 8 292-3384 8 292-3144 
Or contact your local GE Sales 
Representative for more information.