- 1MV collector bushings
- 2LV bus from inverters
- 3Cooling fins
- 4PV / BESS inverter
Inverter-Duty Step-Up Padmount
Step-up padmounts designed around inverters: reverse power flow, daily thermal cycling, harmonic ripple and DC offset. Electrostatic shield, dual LV windings and FR3 fluid available. CANDRON-built up to 7.5 MVA.
Built for Inverters, Not Just Rated for Them
Solar and battery inverters are hard on transformers. Power flows from the low-voltage side up to the grid, output swings from zero to full several times a day, and the inverter’s switching leaves ripple and a little DC in the current. An ordinary distribution transformer runs hotter and ages faster under that duty. Our inverter-duty units are designed for it from the start: sized for the real harmonic heating, shielded between windings, braced for cycling, and wound so each inverter can have its own isolated LV winding.
- Designed to the IEEE C57.159 guide for PV transformers
- Electrostatic shield between LV and HV windings
- Single or dual (split) LV windings for two inverters
- Heating calculated for inverter harmonic spectrum
- Wye or delta LV to suit the inverter grounding
- CANDRON has built a 3 MVA, 27.6 kV unit of this type
Inverter-Duty Step-Up Padmount in plain words
What it does
A 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.
Pick it when
- You are building a solar farm, battery storage site or EV-charging depot with inverters
- Power flows from the low-voltage side up to the grid
- The unit will load and unload many times a day
Better choice if…
The transformer only feeds ordinary building loads
See the Three-Phase Padmount →What's Included
- Step-up rated core and coil, braced for frequent load cycling
- Electrostatic shield with external ground
- LV 480, 600, 630, 690 or 800 V to match the inverter
- HV loop or radial feed, dead-front
- Load-break switch and fusing on the HV side
- Sealed tank, pressure relief, gauges with contacts
- FR3 natural ester for higher thermal margin
- Corrosion-resistant finish for exposed sites
- +Dual (split) LV windings
- +Vacuum fault interrupter
- +Skid-mounted package with the inverter or LV switchgear
- +Stainless-steel enclosure
- +Fibre-optic winding temperature monitoring
- +Surge arresters both sides
Full Specifications
| Parameter | Value |
|---|---|
| Rating | 500 – 7,500 kVA, three-phase, 60 Hz |
| Low voltage (inverter side) | 480 – 800 V, single or dual windings |
| High voltage (collector side) | Up to 34.5 kV (e.g. 27.6 kV, 25 kV, 13.8 kV) |
| Winding arrangement | Delta or wye HV; wye or delta LV to suit inverter |
| Electrostatic shield | Standard, grounded |
| Cooling | ONAN; KNAN with FR3 |
| Fluid | FR3 natural ester recommended; mineral oil available |
| Temperature rise | 65 °C average winding rise (55/65 °C dual rating optional) |
| Taps | 2 × 2.5% above and 2 × 2.5% below nominal, de-energized tap changer |
| Tests | Routine tests per IEEE C57.12.90 and CSA C2.1: ratio, polarity and phase relation, winding resistance, no-load and load losses, impedance, applied and induced potential, leak test |
Built to Standard
Where It's Used
- Utility-scale and community solar farms
- Battery energy storage systems
- Wind collector systems
- EV-charging depots with grid-tied inverters
- Microgrids and hybrid plants
From design and specification through factory testing, commissioning, and ongoing maintenance — CANDRON delivers at every phase.
- Engineering drawings and coordination studies
- Factory acceptance testing (FAT) with full reports
- Site commissioning and protection settings
- Spare parts, training, and maintenance support
Common Questions
A standard unit expects power to flow from HV to LV with a smooth daily load curve. Inverters push power the other way, swing between full and zero output, and add harmonic heating. A transformer not designed for that runs hotter and wears its insulation out sooner.
It is a grounded metal layer between the windings. It keeps high-frequency noise from the inverter’s switching off the medium-voltage system and protects the inverter from surges coming the other way.
Yes — with a dual (split) low-voltage winding, each inverter gets its own isolated winding, which keeps their switching from interacting.
Ready to Spec
Your Project?
Our engineering team responds with specs, lead times, and pricing the same day. Tell us what you need:
- kVA rating
- Inverter make, model and output voltage
- Number of inverters per transformer
- Collector voltage and grounding
- Site location and ambient
- Interconnection or utility requirements
Send us your project details and we'll respond with a price, lead time, and any clarifying questions — typically within a few hours.
Request a Quote →Or call +1 (647) 616-2595