35kV Oil-immersed Transformer

Our 35kV oil-immersed transformers cover S11, S13, S18, S20 and S22 energy-efficient models, and they run on both 50 Hz and 60 Hz. Voltage combinations, connection groups, tap changers, corrosion protection, and insulation levels can all be customised to your project specs. We build them to IEC 60076, and if you need UL, CE, or EAC marks, we can arrange that too.

On the core stacking side, we run a fully automated JOERG robotic line with 45° miter joints and a one-sheet-at-a-time approach. In real-world tests, that cuts no-load losses by 7–10% and drops excitation current by over 30% compared to conventional methods. The payoff? Lower self-consumption, less heat, and much quieter operation – a clear win whether you’re installing in a remote village with a weak grid or a crowded city substation.

Leaks are one of the biggest headaches with older transformers, and they’re a major maintenance drag for overseas owners. That’s why we use robotic welding on every tank, plus our own patented sealing structure – expansion rings, retaining rings, and rotatable baffles work together to keep the gasket tight against the cover. For corrosion protection, we offer coatings from C3 up to C5-M, so the enclosure stands up to tropical islands, Central Asian deserts, South American coastlines, or Russian deep-freeze.

We don’t push standard “off-the-shelf” boxes. Instead, we deliver an engineered package that actually fits your local climate, your grid characteristics, and your certification rules. Tell us your project parameters – we’ll put together a tailored technical proposal and a step-by-step plan to get you through local approvals.