The Oil-Immersed Power Transformer is engineered for dependable, efficient, and long-lasting performance in electrical power transmission and distribution networks. The transformer’s core is constructed from high-grade cold-rolled silicon steel sheets, precision laminated to minimize core losses. Its windings are manufactured with high-purity copper conductors, designed to reduce electrical resistance and improve efficiency. The oil-immersed insulation and cooling system not only enhances dielectric strength but also effectively dissipates heat, ensuring continuous operation under high loads. The tank structure is built to withstand mechanical stresses and environmental conditions, making it ideal for demanding installations. These transformers are widely used in utility substations, industrial plants, renewable energy integration points, and large commercial facilities. With strict adherence to IEC and GB/T manufacturing standards, they offer long service life, high operational safety, and minimal maintenance requirements.

Technical Specifications

(Example values; can be adjusted based on actual rating)

Parameter	Value
Rated Capacity	10 kVA – 250 MVA
Rated Voltage	Up to 220 kV
Frequency	50 / 60 Hz
Cooling Method	ONAN / ONAF / OFAF
Insulation Level	IEC 60076 / GB/T compliant
No-load Loss	As per efficiency class requirements
Load Loss	As per IEC standards
Vector Group	Dyn11 / Yyn0 / Others available
Impedance Voltage	As per customer specification
Dielectric Strength	≥ 35 kV (AC) / BIL as per rating
Temperature Rise	55°C / 65°C
Noise Level	≤ 60–70 dB (depending on rating)
Tap Changer	Off-circuit or On-load tap changer (±2×2.5% or as specified)
Cooling Medium	Mineral oil or biodegradable ester oil
Standards Compliance	IEC 60076, GB/T 6451, ANSI (optional)

About Manufacturer

WELTRUS (Hangzhou Weltrus New Energy Technology Co., Ltd.) is part of the Welfull Group, established in 1993, with an annual operating income exceeding 5.6 billion yuan. Leveraging a strong industrial and financial foundation in Zhejiang Province, China, WELTRUS stands at the forefront of clean energy and power technology development. R&D & Innovation: Weltrus brings extensive R&D experience in energy storage, power transformation, photovoltaic technology, new energy vehicle systems, and HVAC/R. This technical strength enables continuous product innovation, ensuring transformers meet evolving global standards for efficiency, safety, and environmental performance.