- 1Loop-feed bushing wells
- 2LV spade bushings
- 3Cooling fins
- 4Penta-head lock
- 5Pressure relief
Liquid-Filled
Transformers
Oil- and ester-filled transformers for the grid and the outdoors — from a 5 kVA polemount to a 100 MVA power transformer. 8 products in three families, explained in plain words.
- 8Liquid-filled products
- 5 kVA → 100 MVARating range
- 230 kVHighest voltage class
- FR3Natural ester option
Where liquid-filled transformers win
Outdoors, all weather
A sealed, welded tank shrugs off rain, snow, dust and salt. That is why nearly every outdoor transformer is liquid-filled.
More power per dollar
Fluid carries heat away far better than air, so the same kVA fits in a smaller, lower-cost unit — the gap grows with size.
Handles overloads
The fluid’s thermal mass soaks up short overloads and cold-load pickup without damage.
Long, measurable life
A fluid sample tells you how the insulation is ageing. Well-kept units run for decades.
What do you need to do?
Pick what you’re powering and how the power arrives — we’ll point you to the right transformer. Still unsure? Call +1 (647) 616-2595.
Tap one or more needs above — we’ll show the transformers that fit, best match first.
Three families, 8 products
Padmount Transformers
Locked, ground-level transformers for underground power — homes, buildings, plants and solar farms.
- Three-Phase Padmount45 – 10,000 kVA · up to 34.5 kVA locked steel cabinet on a concrete pad that takes underground medium-voltage cable in and gives a building or site its three-phase service voltage.
- Single-Phase Padmount10 – 250 kVA · up to 34.5 kVA low, lockable box on a small pad that feeds homes and small buildings their 120/240 V service from an underground cable.
- Inverter-Duty Step-Up500 – 7,500 kVA · up to 34.5 kVA padmount built to take power from solar or battery inverters and step it up to the medium-voltage collector system — running backwards, cycling hard and handling inverter ripple all day.
Substation & Power Transformers
Transformers for main electrical yards, utility substations and mobile power.
- Unit Substation300 – 5,000 kVA · up to 34.5 kVA substation-style transformer with flanged throats on each side, so the medium-voltage switch and the low-voltage switchboard bolt straight onto it as one lineup.
- Power Transformer5 – 100 MVA · up to 230 kVA large substation transformer that takes transmission or sub-transmission voltage and steps it down to distribution voltage for a utility, plant or renewable project.
- Portable Substationup to 12.5 MVA · up to 72 kVA complete substation — disconnect, protection, transformer and low-voltage gear — built on a trailer or skid so it can be moved in, connected and energized quickly.
Polemount Transformers
Overhead transformers for utilities, farms and rural services.
- Single-Phase Polemount5 – 333 kVA · up to 34.5 kVThe round can on a hydro pole: it takes overhead distribution voltage and steps it down to 120/240 V for homes, farms and small businesses.
- Three-Phase Polemount30 – 300 kVA · up to 34.5 kVOne three-phase tank on a pole or platform — an alternative to a bank of three single-phase units when an overhead-fed site needs three-phase power.
The whole range, side by side
| Product | Rating | Voltage | Cooling | Mounting |
|---|---|---|---|---|
| Padmount Transformers | ||||
| Three-Phase Padmount | 45 – 10,000 kVA | 2.4 – 34.5 kV primary | ONAN (KNAN with FR3) | Concrete pad, outdoor |
| Single-Phase Padmount | 10 – 250 kVA | Up to 34.5 kV · 120/240 V | ONAN (KNAN with FR3) | Low-profile pad |
| Inverter-Duty Step-Up | 500 – 7,500 kVA | LV 480 – 800 V · HV up to 34.5 kV | ONAN / KNAN | Pad or skid |
| Substation & Power Transformers | ||||
| Unit Substation | 300 – 5,000 kVA | 2.4 – 34.5 kV primary | ONAN / ONAF | Pad, close-coupled |
| Power Transformer | 5 – 100 MVA | Up to 230 kV primary | ONAN / ONAF / ONAF2 | Substation yard |
| Portable Substation | 1 – 12.5 MVA | Up to 72 kV primary | ONAN / ONAF | Trailer or skid |
| Polemount Transformers | ||||
| Single-Phase Polemount | 5 – 333 kVA | Up to 34.5 kV · 120/240 V | ONAN | Pole |
| Three-Phase Polemount | 30 – 300 kVA | Up to 34.5 kV primary | ONAN | Pole or platform |
Ratings shown are our standard build range. Larger, smaller and special designs are available — ask our engineers.
Size it before you call
Free calculators our engineers use every day — handy for a first pass at the rating and fault level.
Common questions
Liquid-filled or dry-type — which should I choose?
Outdoors, or above a few MVA, liquid-filled is usually the better value. Indoors, near people, or where fire and spill rules are strict, a dry-type transformer avoids containment and fire-separation costs. Many sites use both.
Mineral oil or FR3 natural ester?
Mineral oil is the economical standard. FR3 natural ester is made from vegetable oil: it is biodegradable, has a fire point above 300 °C (a “less-flammable” fluid), and slows paper insulation ageing. Choose it near buildings, water, or anywhere the fire code or environmental permit asks for a less-flammable fluid.
Do you build to Canadian standards?
Yes. Distribution transformers are built to CSA C2.1 and the CSA C227 padmount standards, power transformers to CSA C88, alongside the matching IEEE C57.12 standards. Every unit is tested in our facility before it ships.
Can you match a utility’s specification?
Yes. Send the specification and we will confirm compliance item by item, including voltages, fusing, bushings, finish and nameplate requirements.
How fast can I get one?
It depends on the rating and options. Call or send your requirements and an engineer will give you a firm date the same day; check our in-stock inventory for units ready now.
Do you offer field service?
Yes. Our field team handles delivery supervision, oil testing, commissioning and maintenance on what we build and on other makes.
Tell us about the load and the line
Send the kVA, voltages and how the power arrives. A CANDRON engineer will recommend the right transformer and quote it the same business day.