Product line
Oil-immersed power transformers up to 31,500 kVA and 110 kV class with on-load or off-circuit tap changers for utility substations, solar and wind plants.
Power-class transformers step a transmission or sub-transmission voltage down to distribution level — or step solar and wind output up for export. Millenium builds three-phase oil-immersed units from 2,000 kVA to 31,500 kVA at 33, 35, 66, 69, 72.5 and 110/115 kV, with on-load tap changers, ONAN/ONAF cooling, conservator and Buchholz protection, and oil, winding and gas monitoring.
Each transformer is designed against the customer's single-line diagram and fault-level study, routine-tested to IEC 60076 and — where the project calls for it — temperature-rise and impulse type-tested with customer or third-party witnesses present.
No products match that search. Try a rating (e.g. “1600 kVA”), a voltage (“33 kV”) or a type (“ring main unit”) — or describe what you need and we will configure it.
Guide to IEC 60076 transformer FAT: routine and type tests, acceptance tolerances, documentation, and how to arrange witness testing.
· 9 min read
Key differences between IEC and ANSI/IEEE transformer standards for 60 Hz markets: voltages, BIL, temperature rise, bushings, testing and UL listing.
· 8 min read
A copy-able checklist of the electrical, mechanical and documentation data a transformer manufacturer needs to issue an accurate, comparable quotation.
· 8 min read
33 kV prefabricated step-up substation — Wind-power collection system. 33 kV collector system; step-up ratio fixed against the grid connection point…
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33 kV/11 kV distribution substation — transformer, RMU, LV switchgear, power distribution cabinets and related accessories — Urban and peri-urban…
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66 kV/11 kV oil-immersed grid transformer with radiator cooling and on-load tap changer — Utility transmission and distribution substation, desert…
Read the project sheet →Power transformers up to 31,500 kVA at 110 kV class, with on-load tap changers and ONAN/ONAF cooling, for utility substations and renewable-energy step-up duty.
Yes. OLTC units regulate the secondary voltage while the transformer stays energised and under load; off-circuit tap changers are fitted where manual, de-energised adjustment is sufficient.
All IEC 60076-1 routine tests — winding resistance, ratio and vector group, impedance and load loss, no-load loss and current, applied and induced voltage, and partial discharge — plus temperature-rise and lightning-impulse type tests on request.
The catalogue shows typical configurations. Every product is built to order — send your single-line diagram or spec and we will quote the exact unit.