No Fear of Lightning, No Power Outages-24/7 Protection with Our Pole Mounted Transformer!
01 General
1.1 Project Description
In 2025, a 50 kVA Single Pole Mounted Transformer was delivered to Canada for use in rural and semi-urban distribution networks. The site serves small residential clusters and local farm or commercial loads powered by a 13.8 kV overhead line. Designed to handle seasonal demand peaks and frequent storm conditions, the transformer ensures stable, efficient power supply even in harsh environments.
Built to CSA C2.2-06 standard, the unit features ONAN cooling, 13.8 kV / 0.347 kV ratings, Ii6 vector group, and Additive polarity. It includes an NLTC tap changer with a ±2 × 2.5% range for precise voltage adjustment. With aluminum windings, 2.3% impedance, and 98.35% efficiency, it offers strong performance with low loss and easy maintenance.
Mounted on a standard distribution pole with a fused primary cutout, surge arrester, and grounding system, this transformer provides a safe and flexible power distribution solution. Ideal for rural electrification, telecom sites, and small industrial loads, it combines durability, reliability, and excellent voltage control in one compact outdoor design.
1.2 Technical Specification
50 kVA Single Pole Mounted Transformer specifications type and data sheet
| Delivered to | Canada |
| Year | 2025 |
| Type | Pole mounted transformer |
| Standard | CSA C2.2-06 |
| Rated Power | 50 kVA |
| Frequency | 60HZ |
| Phase | 1 |
| Polarity | Additive |
| Cooling Type | ONAN |
| Primary Voltage | 13.8 kV |
| Secondary Voltage | 0.347 kV |
| Winding Material | Aluminum |
| Angular displacement | Ii6 |
| Impedance | 2.3% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5% |
| No Load Loss | 0.135 kW |
| On Load Loss | 0.705 kW |
1.3 Drawings
50 kVA Single Pole Mounted Transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| This Single Pole Mounted Transformer features an advanced wound core design, where the core is continuously wound from high-permeability cold-rolled silicon steel strips to form a seamless closed magnetic circuit. Compared to conventional laminated cores, the wound core offers lower no-load loss, reduced noise, uniform flux distribution, and enhanced short circuit resistance. |  |
2.2 Winding
 | This Single Pole Mounted Transformer employs advanced winding technology: the low-voltage (LV) side utilizes foil winding for superior current-carrying capacity and heat dissipation, effectively reducing eddy current losses; while the high-voltage (HV) side adopts precision layered wire winding to ensure insulation strength and voltage stability. This “foil-wound LV + wire-wound HV” combined design achieves optimal efficiency, compactness and short-circuit resistance, making it ideal for demanding outdoor pole-mounted applications. |
2.3 Tank
| This Single Pole Mounted Transformer employs a hermetically sealed cylindrical tank formed through precision roller bending process. Made from premium cold-rolled steel, the tank is shaped by CNC rolling machine with only one precision laser-welded longitudinal seam, rigorously inspected by X-ray and leak tests. The cylindrical design offers not only compact aesthetics but also exceptional mechanical strength and heat dissipation, featuring innovative internal oil guiding channels for efficient natural cooling. With triple-layer anti-corrosion coating (primer + epoxy intermediate + polyurethane topcoat), it withstands harsh environments like salt spray and acid rain. |  |
2.4 Final Assembly
 | 1. Winding Assembly: Slide the HV/LV windings onto the laminated core, ensuring proper alignment and insulation clearance. 2. Electrical Connections: Connect winding leads to tap changers, bushings, and other components, followed by tightening and insulation treatment. 3. Core-Coil Drying: Place the assembled active part into a drying oven to remove moisture and enhance insulation performance. 4. Tank Installation: Hoist the dried active part into the tank, secure it in position, and seal the tank cover. 5. Accessory Mounting: Install bushings, arrester, pressure relief valve. 6. Oil Filling & Sealing: Vacuum-fill with insulating oil, check oil level and sealing after settling, and conduct final tests for completion. |
03 Testing
| 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 | 0.06~0.10 | Pass |
| 3 | Polarity tests | / | Additive | Additive | Pass |
| 4 | No-load losses and excitation current | % | I0 :: provide measured value（100%） | 0.24 | Pass |
| kW | P0: provide measured value（100%） | 0.1065 | |||
| % | I0 :: provide measured value（105%） | 0.24 | |||
| kW | P0: provide measured value（105%） | 0.1172 | |||
| / | the tolerance for no load loss is +10% | / | |||
| 5 | Load losses , impedance voltage,total losses and efficiency | / | t:85℃ the tolerance for impedance is ±15% the tolerance for total load loss is +6% | / | Pass |
| % | Z%: measured value | 2.28 | |||
| kW | Pk: measured value | 0.634 | |||
| kW | Pt: measured value | 0.7405 | |||
| % | Efficiency not less than 98.84% | 99.01 | |||
| 6 | Applied Voltage Test | / | LV: 10kV 60s HV：34kV 60s | No collapse of the test voltage occurs | Pass |
| 7 | Induced Voltage Withstand Test | / | Applied voltage (KV):2 Ur | No collapse of the test voltage occurs | Pass |
| Duration(s):40 | |||||
| Frequency (HZ): 180 | |||||
| 8 | Insulation Resistance Measurement | GΩ | HV-LV·to·Ground | 451 | Pass |
| LV-HV to Ground | 489 | ||||
| HV&LV to Ground | 113 | ||||
| 9 | Leakage Test | / | Applied pressure：20kPA | No leakage and no Damage | Pass |
| Duration：12h | |||||
| 10 | Oil Test | kV | Dielectric Strength | 61.3 | Pass |
| mg/kg | Moisture Content | 10.6 | |||
| % | Dissipation Factor | 0.091 | |||
| mg/kg | Furan Analysis | ≤0.1 | |||
| / | Gas Chromatography Analysis | / |
04 Packing and Shipping
4.1 Packing
| The Single Pole Mounted Transformer is packed in a fully enclosed wooden crate constructed with moisture-proof plywood, featuring custom-molded foam inserts and anti-vibration brackets to immobilize the unit during transit. The exterior is coated with waterproof varnish and reinforced with steel straps, equipped with heavy-duty lifting lugs at all corners. Prior to packing, the transformer undergoes vacuum drying and is filled with 0.02MPa nitrogen. Prominent international symbols for center of gravity, “Keep Dry” and “This Side Up” are displayed. Certified to ISTA 3A standards, the packaging withstands 2000km road transport and international sea freight conditions. |  |
4.2 Shipping
 | The transformers will be shipped under CIF (Cost, Insurance, and Freight) terms, departing from Ningbo port to the Port of Montreal. The shipment will be transported via containerized sea freight, with secure loading and protective measures (anti-shock, moisture-proof, and anti-corrosion) to ensure safe long-distance maritime transit. The seller will arrange ocean transportation and provide marine insurance (All Risks), covering potential losses due to accidents or natural disasters during transit. Upon arrival at Montreal, the buyer is responsible for customs clearance and further inland transportation. |
05 Maintenance Of Pole-Mounted Transformers
Maintaining pole-mounted transformers isn’t just about ticking off a checklist. It’s about ensuring every unit continues to operate safely, efficiently, and for as long as possible. Safety, reliability, and consistency – they all depend on small details. Sometimes, the details others overlook.
(1) Regular Visual Inspection
The first step is always the simplest – just look. A quick scan often tells more than a report. Check for oil leaks, corrosion, or dents. Oil stains might suggest a bad seal; rust could mean the tank is slowly losing its strength. Fixing these early-before they grow into bigger problems-saves both time and equipment.
(2) Oil Level and Quality Check
Transformer oil is its lifeblood. It cools, insulates, protects. Low oil? That’s a red flag. Darkened or cloudy oil? Also trouble. Scotech’s experience shows that regular oil checks, even quick ones, prevent most overheating cases before they ever start.
(3) Oil Purification
Now, sometimes inspection isn’t enough. The oil might look fine but lose its properties over time – moisture, gases, tiny particles sneak in. That’s when purification comes in. Vacuum dehydration, filtration, degassing… a bit technical, yes, but necessary. Each cycle restores the oil’s strength, extending the transformer’s lifespan.
(4) Fastening Connections
Loose bolts don’t sound dramatic, but they cause real problems – arcing, heat spots, failures. Every connection matters: bushings, taps, grounding points. Scotech’s maintenance teams tighten, recheck, and tighten again if needed. It’s tedious work, but that’s what keeps transformers alive for years.
(5) Cleaning
Dust, bird droppings, even leaves – small things that block airflow and trap heat. Over time, the radiator can’t breathe. So, cleaning is not cosmetic; it’s part of the cooling system. A clean transformer runs cooler, lasts longer.
