Reliable and efficient, our utility transformer delivers safe 120/240V power for Canada's residential and rural distribution networks.
01 General
1.1 Project Description
In 2025, a 75 kVA single-phase pole-mounted transformer was sent to Canada for an overhead distribution project. It was set up in a quiet suburban area to feed several homes and a few small local businesses through a 14.4 kV line. The region often faces freezing winters and sudden storms, so the 75 kVA utility transformer had to be tough enough to keep power steady no matter the weather.
The unit follows CSA C2.2-06 standards and runs at 24.94GrdY/14.4 kV to 120/240 V, 60 Hz. It uses ONAN cooling and aluminum windings, with 3% impedance for solid voltage regulation. A no-load tap changer (±2×2.5%) makes it easy to fine-tune the output when needed. With core losses of 141 W and load losses of 1,160 W, the transformer performs efficiently in day-to-day use.
It also comes with two arrester supports and an Internal Fault Detector (IFD) that gives a quick visual signal if anything goes wrong inside, so maintenance crews can act right away. Compact, sturdy, and simple to install, this utility transformer fits perfectly in residential zones, rural networks, and public lighting systems, delivering safe and reliable power across Canada.
1.2 Technical Specification
75 kVA pole mounted utility transformer specifications type and data sheet
| Delivered to | Canada |
| Year | 2025 |
| Type | Pole mounted transformer |
| Standard | CSA C2.2-06 |
| Rated Power | 75 kVA |
| Frequency | 60HZ |
| Phase | 1 |
| Number of Winding | 2 |
| Polarity | Additive |
| Cooling Type | ONAN |
| Primary Voltage | 24.94GrdY/14.4 kV |
| Secondary Voltage | 120/240 kV |
| Winding Material | Aluminum |
| Angular displacement | Ii6 |
| Impedance | 3% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 141 kW |
| On Load Loss | 1160 kW |
| Accessories | Arrester Support 1 & IFD 1 |
1.3 Drawings
75kVA pole mounted utility transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| Our utility transformer core adopts a high-quality wound core structure, ensuring compact magnetic circuits and reduced losses. Precision manufacturing and silicon steel laminations result in excellent performance—no-load loss measured at 0.128 kW (rated), 0.145 kW (105% voltage), and excitation current as low as 0.18%, proving outstanding efficiency. |  |
2.2 Winding
 | The transformer adopts a two-winding, single-phase structure with an additive polarity (vector group Ii6). The low-voltage winding uses aluminum foil, offering excellent short-circuit strength and heat dissipation, while ensuring lightweight construction. The high-voltage winding is made of copper round wire, ensuring superior conductivity, mechanical strength, and thermal stability for long-term reliability. |
2.3 Tank
| All components of our oil tank are processed with <1mm tolerance, using flat, rust-free steel plates that meet national standards. Welds are continuous, clean, and defect-free. Inner and outer splatter is thoroughly removed, especially around radiator bases and lifting lugs. Each transformer tank undergoes a 12-hour airtight test at 20kPa, ensuring no leakage. Structural strength and sealing performance meet or exceed quality requirements. |  |
2.4 Final Assembly
- Preparation
Clean the assembly area thoroughly. Prepare and inspect all qualified materials, including the wound core, pre-wound HV and LV coils, tank, and required accessories.
- Core & Coil Assembly
Assemble the wound core with HV and LV coils, install insulation parts, connect leads to the tap changer and bushings, and secure everything with proper binding and clamping.
- Tanking
Hoist the dried active part into the tank and fix it securely using base bolts to prevent movement during operation.
- Cover Sealing & Accessories
Place sealing gaskets, install the cover with integrated accessories, and tighten bolts evenly. Internally connect leads to bushings. Install components such as nameplate, pressure relief device, IFD, and arrester support as required.
- Vacuum Oil Filling
A critical step—apply high vacuum to thoroughly remove moisture and gases. Under vacuum, fill with qualified insulating oil to the specified level and allow sufficient soaking time, especially important for wound core designs.
- Sealing & Testing
Conduct a 20 kPa airtightness test for 12 hours—no leakage allowed. Adjust oil level and perform a full set of routine tests, including induced voltage withstand, no-load loss, and load loss tests.
- Finishing & Packing
Clean the surface, touch up paint, install terminal protectors, seal the drain valve, and affix the nameplate. Final packaging and storage follow.
03 Testing
TESTING STANDARD
CSA C2.2-06（R2022） Single-phase and three-phase liquid-filled distribution transformers
CSA C802.1-13（R2022） Minimum efficiency values for liquid-filled distribution transformers
TEST RESULT
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion |
| 1 | Resistance Measurements | / | / | / | Pass |
| 2 | Ratio Tests | / | The deviation of voltage ratio on the principal tapping: ≤0.5% Connection symbol: Ii6 | -0.02 | Pass |
| 3 | Polarity tests | / | Additive | Additive | Pass |
| 4 | No-load losses and excitation current | % | I0 :: provide measured value（100%） | 0.18 | Pass |
| kW | P0: provide measured value（100%） | 0.128 | |||
| % | I0 :: provide measured value（105%） | 0.37 | |||
| kW | P0: provide measured value（105%） | 0.145 | |||
| / | the tolerance for no load loss is +15% | / | |||
| 5 | Load losses , impedance voltage,total losses and efficiency | / | t:85℃ the tolerance for impedance is ±7.5% the tolerance for total load loss is +8% | / | Pass |
| % | Z%: measured value | 3.20 | |||
| kW | Pk: measured value | 1.104 | |||
| kW | Pt: measured value | 1.232 | |||
| % | Efficiency not less than 98.94% | 99.00 | |||
| 6 | Applied Voltage Test | / | LV: 10kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | / | Applied voltage (KV):2Ur | No collapse of the test voltage occurs | Pass |
| Duration(s):48 | |||||
| Frequency (HZ): 150 | |||||
| 8 | Insulation Resistance Measurement | GΩ | LV-HV to Ground | 3.64 | Pass |
| 9 | Leakage Test | / | Applied pressure：20kPA | No leakage and no Damage | Pass |
| Duration：12h | |||||
| 10 | Oil Test | kV | Dielectric Strength | 54.8 | Pass |
| mg/kg | Moisture Content | 9.5 | |||
| % | Dissipation Factor | 0.00237 | |||
| mg/kg | Furan Analysis | 0.03 | |||
| / | Gas Chromatography Analysis | / |
04 Packing and Shipping
05 Installation Requirements
Safety in Pole-Mounted Transformer Installation
Safety isn’t just a rule-it’s the starting point of everything. Installing a pole-mounted transformer means working at heights, handling heavy equipment, and connecting live power lines. Each step carries its own risks. That’s why careful planning and protection aren’t optional-they’re essential.
Personal Protective Equipment (PPE):
Start with the basics. Helmet. Gloves. Goggles. Protective clothing. Simple, but life-saving. Skipping even one piece, just once, can cause serious harm.
Follow Safety Standards:
Rules may seem rigid, but they exist for a reason. Every line in a safety code was written after someone got hurt. Following standards might feel slow, yet it’s the fastest way to prevent accidents.
Proper Training:
Training builds confidence-and saves lives. A well-trained team knows what to do, even when something goes wrong. They react faster, stay calm, and keep control. That makes all the difference.
Equipment Inspection:
Check everything. Cables, hooks, and hoists. A loose strap or frayed wire might look small, but it can change everything. A few minutes of inspection protect hours of safe work.
Warning Signs and Barricades:
Mark the zone. Bright tape, clear signs, solid barriers. They keep bystanders safe and remind workers to stay alert. Awareness is quiet, but it protects everyone.
06 Site and Summary
This 75kVA single-phase pole-mounted transformer is purpose-built to meet the demands of North American distribution networks, fully compliant with CSA C2.2-06 standards. Engineered for overhead applications, it delivers a stable 0.347 kV output from a 24.94GrdY/14.4 kV input-ideal for commercial lighting, institutional power supply, and urban distribution systems.
With robust ONAN cooling, reliable aluminum/copper windings, and integrated protection features like the Internal Fault Detector (IFD), this transformer ensures safe, low-maintenance operation. The compact pole-mounted design simplifies installation, reduces space needs, and supports efficient grid modernization.
Whether deployed for utility pole upgrades, public lighting systems, or infrastructure expansions, this utility transformer offers a dependable and cost-effective solution for enhancing energy efficiency and power stability in Canadian commercial environments.
