35kV oil immersed transformers

35kV oil immersed transformers

Designed for primary distribution networks, 35kV oil immersed transformers offer reliable voltage step-down from high-voltage grids to medium-voltage systems. With high thermal stability, low losses, and strong short-circuit resistance, they are ideal for power plants, utility substations, and large-scale infrastructure.

Why Use 35kV Oil Immersed Transformers?

High Efficiency

Constructed with low-loss silicon steel cores and precision-engineered windings, 35kV transformers meet or exceed international energy efficiency standards such as IEC 60076 and DOE 2016, minimizing operational costs over decades of use.

Long Service Life

With corrosion-resistant steel tanks, high-grade insulation, and sealed oil systems, these transformers are designed for 25+ years of reliable performance, even in outdoor or demanding environments.

Voltage Flexibility

Available in multiple configurations and voltage classes, including:

  • 15kV up to 36kV Series

  • 33kV Series

  • 35kV Series

Technical datasheets are available for each series to assist with precise project selection.

Key Features of 35kV Oil Immersed Transformers

Core and Windings

Low-loss cold-rolled silicon steel cores combined with high-conductivity copper or aluminum windings provide excellent electrical efficiency and thermal performance.

Cooling System

Standard ONAN (Oil Natural Air Natural) cooling ensures reliable heat dissipation. Optional ONAF (forced air) systems are available for high-capacity models. Corrugated tanks or bolt-on radiators enhance cooling efficiency.

Protection and Safety

Equipped with Buchholz relays, oil level indicators, pressure relief valves, thermometers, and optional surge arresters or on-load tap changers (OLTC) to enhance protection and operational flexibility.

Low Noise Operation

Engineered for low sound levels (<60 dB for 1000–2500kVA), suitable for utility and industrial applications near populated areas.

Environmental Adaptability

Available with biodegradable insulating oil and sealed-tank construction to prevent leakage and reduce environmental risks.

Applications of 35kV Oil Immersed Transformers

  • Primary Distribution Substations

  • Industrial Parks and Heavy Industry

  • Power Generation Plants

  • Infrastructure Projects (Airports, Rail, Ports)

  • Renewable Energy Integration (Wind, Hydro, Solar)

Standards and Compliance

  • Design Standards: IEC 60076, ANSI/IEEE C57.12, GB, AS, CSA

  • Testing: 100% routine tests per IEC/IEEE; optional type and special tests available

  • Certifications: CE, ISO9001, ISO14001, ISO45001, RoHS (on request)

Advantages of CHBEB 35kV Oil Immersed Transformers

  • Excellent thermal and dielectric performance

  • Strong short-circuit withstand capability

  • Fully customizable (voltage ratio, impedance, tank design)

  • Low loss, low noise, and high energy efficiency

  • Long service life with minimal maintenance

Choose CHBEB

Choose CHBEB 35kV oil immersed transformers for a powerful, efficient, and durable solution to your primary power distribution needs. With over 60 years of transformer manufacturing experience, CHBEB serves clients in Asia, Africa, the Middle East, and global EPC markets.

👉 Need technical specs or drawings?
Browse by voltage category:

  • 15kV up to 36kV Serie

  • 33kV Serie

  • 35kV Serie

Or contact our engineering team for project consultation and pricing.