50 KVA Pole Transformers-14.4/0.12*0.24 KV | Canada 2025

50 kVA pole transformers with Dual Voltage & IFD protection - efficient, surge-ready power for coastal and rural distribution networks

01 General

1.1 Project Description

The 50 kVA single-phase pole-mounted transformer is designed for dependable overhead distribution in coastal and rural areas. It operates at 60 Hz and supports dual primary voltages (24,940 GRDY or 14,400 V), allowing installation on various feeders while providing 120/240 V output on the secondary. The unit uses aluminum windings and a laminated steel core, with ONAN cooling and mineral-oil in a sealed tank for long outdoor life. It achieves ≥99.04% efficiency, with no-load loss 130 W, load loss 492 W, and impedance 2.16% (±10%). A Non-Load Tap Changer (NLTC) ±2 × 2.5% keeps voltage stable under changing loads.

The pole transformers also carries a 9 kV high-voltage arrester to clamp lightning and switching surges to ground before they can stress the insulation or damage windings – a must for feeders exposed to thunderstorms, salt spray, and winter wind/ice. The dual-voltage feature allows utilities to keep fewer transformer types in stock and install units quickly during outages or upgrades. With a 50 kVA rating, it can serve more homes and businesses than a 25 kVA transformer, making it a reliable, low-maintenance solution for coastal and rural distribution networks.

1.2 Technical Specification

50kVA pole transformers specification and data sheet

1.3 Drawings

50kVA pole transformers dimensions and weight details

02 Customized Design for Coastal Climate Conditions

Since the installation site is in a coastal area-with humid air, frequent rain, and a bit of salt in the air-we went beyond a basic setup and made a few targeted upgrades:

2.1 High-Voltage Bushing Protective Covers

We went ahead and put protective covers on the high-voltage bushings-mainly to keep that insulation happy and stable. You know, in a damp, rainy, sometimes just plain wet environment, exposed insulation is kind of asking for trouble. These covers? They basically shield it from moisture, from the salty coastal air, from all the little things that could make life harder for the transformer.

2.2 9 kV HV Arrester

Then there’s the 9 kV HV arrester. Small, yes, but it’s a big deal when those surprise voltage spikes hit-storms, switching, or just the random quirks of coastal weather. It’s there to catch them, stop flashovers, and basically keep the system from freaking out on a bad day.

03 Manufacturing

3.1 Core

The wound core is made for outdoor use. Its stacked design resists vibration and keeps the transformer steady on poles. It reduces no-load loss, works well on long feeders, and can handle wind, ice, and other weather, giving homes and small businesses reliable electricity.

3.2 Winding

This pole-mounted transformer uses a low-voltage foil winding and a high-voltage wire winding, copper and aluminum combined. The LV foil keeps impedance low. Heat spreads evenly. HV wire is flexible, handles load changes. Copper-aluminum mix-balances efficiency and cost. Reliable, durable, fits small grids, residential or light commercial, day after day.

04 Testing

05 FAQ

Q1: Is it safe to install a transformer in humid or coastal environments? Yes, generally it’s safe. But, coastal areas—humidity, salt in the air, sometimes just wet and damp—can be tough on a transformer. That’s why we recommend moisture-resistant designs, like high-voltage bushing covers, corrosion-resistant materials, and solid grounding. Helps prevent insulation issues. Keeps things running longer. A quick check now and then catches problems early.Q2: Can a transformer overheat? It can. Especially if loads are high, or it’s running constantly, or ventilation isn’t perfect. You need proper sizing first. Cooling? Very important. Oil temperature or winding temp—monitor them. And pick a transformer with the right temperature rise rating for your expected load. Overheat too long, insulation ages faster, efficiency drops, risk of failure rises.Q3: Is a lightning arrester necessary? Yes, strongly. Even small surges, lightning, switching spikes—they happen. Without a surge arrester, insulation could fail, flashovers can occur, transformer life shrinks. A simple device, but it makes a big difference. Coastal storms or unstable grids—arrester is basically peace of mind. Q4: How often should a transformer be maintained? At least once a year. Electrical tests—insulation resistance, winding resistance, ratio checks. Grounding—make sure it’s solid, low resistance. Insulation—look for cracks, corrosion, moisture. Oil-immersed units? Oil quality analysis, DGA, moisture, acidity. Sometimes more often, if the load is heavy or environment harsh. Keeps it running, avoids surprises.