75 kVA Transformer: Real Talk on Types, Specs, Uses, Price & Why Yawei Makes Sense
If you're looking at a 75 kva transformer, you're probably dealing with a solid mid-size power need-enough to run a small factory floor, a commercial building, a bunch of homes, or farm equipment without going overboard on capacity. It's that practical sweet spot between the little residential units and the big industrial beasts.
Yawei Transformer (Jiangsu Yawei Transformer Co., Ltd.) has been building these things for over 30 years. They're based in China, ship worldwide, and their units hit the usual international standards-IEEE, ANSI, DOE, CSA, UL, IEC. They do OEM/ODM work, offer at least a two-year warranty, and keep pricing competitive because they control a lot of the production themselves.
Quick Breakdown: What a 75 kVA Transformer Actually Does
Simple version: it steps voltage up or down without changing the frequency. The 75 kVA rating means it can handle 75,000 volt-amperes of apparent power. Real usable power (kW) depends on your power factor-around 60 kW if you're sitting at 0.8 PF, or the full 75 kW if everything's nice and clean at unity.
Rough full-load currents people usually ask about:
Three-phase at 208 V → about 208 A
Three-phase at 480 V → roughly 90 A
Single-phase at 240 V → around 313 A
Nothing fancy, just reliable conversion for everyday loads.
The Main Types You'll Run Into
Single-phase pole-mounted oil-immersed These are the ones you see
hanging on utility poles in rural and suburban areas. Sealed tanks, ONAN cooling, high-voltage bushings on top. Secondary is usually 120/240 V. Good for a cluster of houses, a farm, or small commercial spots.
Yawei's D11 series is pretty common here and keeps the losses low.
Three-phase oil-immersed Better when you need balanced three-phase power-workshops, small industrial sites, commercial buildings. Can be pole-mounted or ground-mounted. Typical voltages run from 6–35 kV on the high side down to 0.4 kV, 208Y/120 V, or 480 V.
Pad-mounted These sit on the ground in a locked, tamper-resistant cabinet. Popular for underground distribution in neighborhoods, shopping areas, that kind of place. Dead-front or live-front options, mineral oil or the greener ester fluids.
Dry-type No oil. Air-cooled or cast-resin. Preferred indoors-hospitals, schools, data centers, office buildings-where fire risk is a bigger deal. Less maintenance, cleaner, but usually costs a bit more.
Yawei makes both oil and dry versions with copper or aluminum windings, whatever fits the job.
Typical Specs for a 75 kVA Unit
Here's a quick reference table of what you'll usually see (numbers can shift a little depending on the exact design and standard):
| Parameter | Typical Range / Value |
|---|---|
| Rated Capacity | 75 kVA |
| Frequency | 50 Hz or 60 Hz |
| Primary Voltage (HV) | 6–35 kV (e.g., 7.2, 13.2, 13.8 kV) |
| Secondary Voltage (LV) | 120/240 V, 208Y/120 V, 400 V, 480 V |
| Cooling | ONAN (oil), air-cooled (dry-type) |
| Impedance | 2–6% |
| Temperature Rise | Oil 60–65 K; windings 65 K (or higher for dry-type) |
| Efficiency | High (DOE 2016 / equivalent compliant) |
| Winding Material | Copper or Aluminum |
| Vector Group | Dyn11, Ii0, Yyn0, etc. |
| Warranty | Minimum 2 years (Yawei standard) |
Yawei tests these pretty thoroughly. The goal is low losses and long service life so you're not dealing with headaches later.
What Does a 75 kVA Transformer Cost in 2026?
Prices bounce around based on type, copper vs aluminum, certifications, extras, and how many you're ordering. Here's a realistic ballpark for factory-direct Chinese pricing (FOB):
| Type | Approximate Price Range (USD) | Notes |
|---|---|---|
| Single-phase oil-immersed pole-mounted | $500 – $8,000 (commonly $1,000 – $5,000) | Most affordable; Yawei basic models often start in the $480–$899 range |
| Three-phase oil-immersed | $1,500 – $6,000 | Standard workhorse units |
| Single/three-phase pad-mounted | $3,000 – $10,000+ (some listings go higher depending on features) | Enclosure and protection push the cost up |
| Dry-type (ventilated or cast-resin) | $2,000 – $8,000+ | Costs more for the indoor/fire-safe advantage |
Copper windings cost more. UL or CSA certification adds a bit. Custom voltages or extra accessories (arresters, gauges, etc.) move the needle too. Volume helps. Yawei's factory-direct approach usually keeps things competitive-just send them your specs and they'll quote properly. Lead time is often around a month once drawings are locked in.
Where These Things Actually Get Used
You'll find a 75 kva transformer powering:
Groups of homes or farms off a pole
Small commercial buildings-retail, restaurants, offices
Light industrial shops and workshops
Schools, clinics, support systems for data centers
Solar or storage setups, temporary power, isolation jobs
Keep continuous loading around 80% or less if you want the unit to last. Overloading is the quickest way to shorten its life.
Why People Pick Yawei
They've been at this since 1992. Big production area, their own component factories (wire, tanks, radiators), solid engineering team. Products go out to more than 60 countries. They handle custom requests without drama and stand behind the two-year warranty. Quality control is pretty tight from materials through final testing, and the pricing is generally fair for what you get.
How to Choose Without Overcomplicating It
Figure out your total load (and leave some room to grow). Decide single-phase or three-phase, frequency, and the voltages you need. Location matters-pole for overhead, pad for underground, dry-type if it's indoors and fire safety is important. Check the efficiency standards and certifications your market requires. Then just ask for drawings and a firm price.
Bottom Line
A 75 kva transformer is a practical, workhorse piece of equipment for a lot of real-world power needs. Yawei makes solid ones at competitive factory prices, with the flexibility to customize and the certifications to ship pretty much anywhere.
If you need current pricing or a quote for a specific 75 kva transformer (pole-mounted, pad-mounted, oil, dry-type-whatever fits), reach out to Yawei directly through their site. Tell them what you're dealing with and they'll sort out the details.
FAQ
Q: How soon can you delivery the transformer?
A: It depends on the quantity and capacity of the transformer, normally within one month since the date drawing confirmed by buyer.
Q: How long can you provide the quality warranty?
A: 24 months since the date transformer operated.
Q: What payment method do you accept?
A: T/T (wire transfer) preferred, L/C both accepted.
