33kV / 35kV Oil-Immersed Transformers

Engineered for Reliable Medium-Voltage Power Distribution

YIMENG 33kV / 35kV oil-immersed transformers are intended for project-specific power distribution applications in utility substations, industrial plants, renewable energy facilities and infrastructure networks. A carefully specified transformer connects the incoming network voltage to the voltage required by downstream equipment, with capacity selected around the load profile and future expansion.

When specifying a 33kV oil transformer or a 35kV distribution transformer, define the primary and secondary voltages, rated capacity, frequency and vector group. Cooling method, winding material and tap-changing arrangements should be reviewed together with the operating conditions. ONAN cooling uses natural oil and air circulation; the final cooling configuration depends on the selected design.

Insulation coordination is an important part of transformer selection for 33kV and 35kV networks. The highest voltage for equipment, power-frequency withstand voltage and lightning impulse withstand level must be agreed for the project. Short-circuit impedance, no-load and load losses, temperature-rise limits and protection requirements should also be documented in the technical specification.

For outdoor substations or indoor installations, provide the site altitude, ambient temperature, available space and installation requirements. Send YIMENG your voltage ratio, kVA or MVA rating, application and delivery requirements to request a tailored technical proposal. Final dimensions, oil quantity, mass and guaranteed performance values are confirmed for the selected transformer.

Natural Cooling

Project Configuration

Winding Options

Engineering Support

Technical Specifications

Parameter	Specification
Product Type	Oil-immersed transformer
Rated Primary Voltage	33 / 35kV / Customizable
Rated Capacity	80kVA/ 200kVA/ 250kVA/ 500kVA/ 800kVA/ 1000kVA/ 1500kVA/ 2000kVA/ 2500kVA/ Customizable
Rated Secondary Voltage	110V/ 220V/ 400V/ 415V/ 433V/ Customizable
Rated Frequency	50 / 60 Hz
Number of Phases	3
Vector Group	Dyn11/ Yyn0
Cooling Method	ONAN
Tapping Range	±2 × 2.5% or ±5%
Tap Changing Mode	On-Load Tap Changing (OLTC)/ No-Load Tap Changing (NLTC)
Standard	IEC 60076 / GB 1094
Winding Material	Copper / Aluminum
Installation	Indoor / Outdoor
Short-Circuit Impedance(%)	Customizable
No-Load Loss(W)	Customizable
Load Loss(W)	Customizable
No-Load Current(%)	Customizable
Insulation Level(kV)	Customizable
Temperature Rise Limits(K)	Customizable
Insulating Liquid	Customizable
Overall Dimensions (L×W×H)(mm)	Customizable
Oil Mass(kg)	Customizable
Total Mass(kg)	Customizable
Applicable Standard()	Customizable