Powering Safe & Efficient Energy Distribution
A Pole Mounted Transformer is a type of distribution transformer mounted on utility poles to step down high-voltage electricity from overhead lines to lower voltages suitable for residential, rural, and light commercial use across the United States.
These compact transformers play a critical role in the electrical distribution network by converting medium-voltage power to common service voltages like 120/240 V that safely power homes, farms, businesses, and street lighting. Their elevated design keeps them above ground-level hazards such as flooding and minimizes space usage, making them ideal for suburban and rural grid infrastructure where underground distribution is impractical.
Pole mounted transformers can be single-phase or three-phase units depending on load requirements, and they are valued for cost-effective installation, easy access for maintenance, and compatibility with existing overhead systems. By efficiently managing voltage conversion and distribution, these transformers help ensure reliable, safe, and continuous electric service throughout communities nationwide.
| Parameter | Details |
|---|---|
|
Applicable Standard |
ANSI C57.12.20 |
|
Type
|
CON and CSPCON Type & CSP Type |
|
Frequency |
60Hz / 50Hz |
|
Efficiency Standard |
DOE 2016 / CSA 802.1 / TP1 |
|
Core |
C.R.G.O (Cold Rolled Grain Oriented) / Core & Amorphous Core |
|
Winding Material |
Cu-Cu / Cu-Al / Al-Al |
|
Tap Range |
±5% in 2.5% increments (4 tap positions: +2, +1, 0, -1, -2) |
|
Product Scope |
5 kVA – 167 kVA |
|
Primary Voltage |
2400V to 19920V |
|
Secondary Voltage |
120V to 600V |
| Additional Parameter | Details |
|---|---|
|
Insulation Class |
Typically Class A or B (consult spec sheet for precise class) |
|
Cooling Method |
ONAN (Oil Natural Air Natural) |
|
Mounting Type |
Pole-mounted or Pad-mounted (based on CSP or CON type) |
|
Temperature Rise |
Generally 55°C / 65°C |
|
Impedance Range |
Usually 2% to 6% depending on size |
|
BIL (Basic Impulse Level) |
95kV (typical for 15kV class), varies with voltage rating |
|
Enclosure Type |
Sealed Tank (with pressure relief) or Conventional vented tank |
|
Protection Features (CSP) |
Internal primary fuse, secondary breaker, lightning arrester, relay |
| Rated Power (kVA) | High Voltage (kV) | Low Voltage (V) | No-Load Loss (W) | Load Loss (W) | Oil Weight (kg) | Total Weight (kg) |
|---|---|---|---|---|---|---|
|
3 |
6, 6.35, 6.66, 7.2, 7.6, 10, 11, 13.2, 13.8 |
120/240, 240/480, 139/277, 120/208, 600 |
9 |
45 |
– |
– |
|
5 |
Same as above |
Same as above |
19 |
75 |
– |
– |
|
10 |
Same as above |
Same as above |
36 |
120 |
22 |
150 |
|
15 |
Same as above |
Same as above |
50 |
195 |
30 |
210 |
|
25 |
34500 / 19920 or 6–13.8 (per above) |
120–240, 240–480, 347, 600 |
80 |
290 |
45 |
258 |
|
37.5 |
13800 / 7957 |
Same as above |
105 |
360 |
50 |
340 |
|
50 |
13200 / 7620 |
Same as above |
135 |
500 |
62 |
395 |
|
75 |
12470 / 7200 or others |
Same as above |
190 |
650 |
88 |
480 |
|
100 |
Same as above |
Same as above |
210 |
850 |
94 |
530 |
|
167 |
Same as above |
Same as above |
350 |
1410 |
138 |
680 |
|
250 |
– |
– |
– |
2000 |
– |
990 |
|
333 |
– |
– |
– |
2500 |
– |
1160 |
Three Phase Transformers Table 2
| Voltage Ratio | kVA Rating | Maximum No-Load Losses in Watts | Maximum Load Losses in Watts |
|---|---|---|---|
|
33kV/400/230V |
25 |
85 |
1210 |
|
33kV/400/230V |
50 |
160 |
1440 |
|
33kV/400/230V |
100 |
310 |
1900 |
|
33kV/400/230V |
200 |
540 |
2810 |
Single Phase Transformers Table 3
| Voltage Ratio | kVA Rating | Maximum No-Load Losses in Watts | Maximum Load Losses in Watts |
|---|---|---|---|
|
33kV/250V-0-250V |
10 |
25 |
614 |
|
33kV/250V-0-250V |
15 |
40 |
652 |
|
33kV/250V-0-250V |
25 |
52 |
780 |
|
33kV/250V-0-250V |
50 |
100 |
1008 |
Cost-Effective Installation – Pole mounted transformers typically require less infrastructure compared to ground or underground systems, reducing installation time and expenses for utility projects.
Space Efficiency – Mounted on utility poles, they save valuable ground space, ideal for areas where land use or terrain makes ground installation difficult.
Improved Safety – Their elevated position keeps high-voltage equipment out of easy reach, reducing risks from flooding, accidental contact, or vandalism.
Easy Access for Maintenance – Line crews can service or replace units from bucket trucks without extensive ground-level disruption, enabling faster repairs and lower downtime.
Flexibility for Rural & Remote Areas – These transformers are well-suited for overhead distribution in rural, suburban, and low-density regions where underground cabling is cost-prohibitive.
Efficient Power Distribution – They reliably step down medium voltages from transmission lines to usable levels (such as 120/240 V), ensuring dependable electricity for homes and small businesses.
Residential Distribution: Step down medium-voltage lines to low voltages (e.g., 120/240 V) to supply homes and neighborhoods with usable electricity.
Rural & Suburban Areas: Ideal for overhead distribution where underground cabling is impractical or cost-prohibitive, serving widely spaced homes and farms.
Small Commercial Loads: Supply electricity to small shops, offices, restaurants, and similar commercial facilities on overhead lines.
Agricultural & Farm Power: Provide power for irrigation systems, farm buildings, and agricultural equipment in remote or rural settings.
Light Industrial Support: Three-phase pole mounted transformers serve light industrial loads like small factories, workshops, and HVAC systems.
Public Infrastructure & Street Lighting: Feed street lights, traffic signals, and other public electric infrastructure along roadways.
Temporary or Remote Installations: Used at construction sites or remote installations where overhead infrastructure is present.
Telecom & Utility Equipment: Power remote telecom towers and utility assets in areas served by overhead distribution lines.
Premier Transformer is a reputable Pole Mounted Transformer manufacturer based in the United States, supplying high-performance distribution transformer solutions for overhead power systems. Their pole-mounted units are engineered to safely step down medium-voltage power on utility poles to service voltages used in residential, commercial, and light industrial applications. These transformers are built with quality materials, cover a wide range of kVA ratings, and adhere to applicable ANSI standards for U.S. distribution systems.
With over 45 years of engineering and manufacturing expertise, Premier Transformer focuses on precision design, rigorous testing, and durability to ensure reliable performance in real-world environments. Their products support efficient power distribution while meeting industry expectations for safety, efficiency, and long-term service life.
Our strict compliance with these standards ensures that our pole-mounted transformers are built to withstand rigorous conditions while delivering optimal performance. We focus on insulation, temperature management, sound level control, and corrosion protection to maintain excellence in every product.
