Transformers for data centers & AI

The electrical challenges

Harmonic-rich, 100% electronic load

Switch-mode supplies draw non-sinusoidal current: the RMS value understates the real heating. A K-rated design oversizes the windings thermally rather than simply adding kVA.

Redundancy means half load

N+1 architectures run transformers at roughly half load, 24/7. Load losses drop, but no-load losses run permanently — which is why going beyond the Tier 2 floor usually pays back here.

Fire safety inside the building

No liquid indoors: cast-resin class F1 is the reference, ester the alternative where a liquid-filled unit is acceptable to your fire strategy.

Monitoring expected

Facilities teams expect winding temperature and status over RS485 / Modbus for DCIM integration.

What we adapt for this sector

Parameter	Our approach
Technology	Cast resin (F1) or ester-filled, per your fire strategy
K-factor	K4 – K13 depending on the measured or estimated harmonic spectrum
Losses	Tier 2 floor; reduced-loss designs quoted where TCO justifies
Monitoring	Temperature control unit, RS485 / Modbus output on request
Delivered lead time	15 to 18 weeks — production + shipping

Indicative approach — the final specification follows your requirement, confirmed at quotation.

Matching products

Cast resin (dry) →Oil-immersed (ester) →MV substation →

Frequently asked

Why is a K-rated design necessary?

Because converter harmonics create eddy-current losses the RMS current doesn't reveal. Without thermal oversizing the windings run hotter than designed and the insulation ages faster — a cheap fix at design time, an expensive one afterwards.

Cast resin or ester for a data center?

Cast resin (F1) is the default indoors: no liquid at all. Ester is a valid route where your fire strategy accepts a liquid-filled unit and you want the cooling and overload behaviour of an immersed design.

Do reduced-loss designs really pay back?

On a site running continuously at partial load, no-load losses are permanent — over a 20–30 year life they usually outweigh the purchase premium. We quote both so the calculation is yours to make.