ZTelec 35kV three phase oil-immersed power transformer is a key device in medium-voltage transmission and distribution systems. It efficiently converts 35,000 volts of electrical energy into lower voltage levels for industrial, commercial, and public utility applications. Built with advanced materials and strict quality control, this transformer ensures high performance, durability, and operational safety even under demanding grid conditions.
High-Quality Design by ZTelec China
Manufactured by ZTelec China, this 35kV transformer adopts cold-rolled grain-oriented silicon steel, high-grade transformer oil, and a robust oil-paper insulation system. The optimized magnetic circuit and precision-engineered core reduce energy loss, noise, and temperature rise, guaranteeing long service life and stable power delivery.
Main Features and Advantages
High Efficiency and Low Loss
Equipped with low-loss silicon steel laminations and precision coil windings to minimize both no-load and load losses, improving energy efficiency and lowering operating costs.
Superior Insulation and Safety
Adopts a high-grade oil-paper insulation system and refined transformer oil with strong dielectric properties, ensuring excellent insulation performance and fire resistance.
Reliable Cooling System
Features ONAN/ONAF cooling modes for stable heat dissipation and consistent temperature control during long-term or heavy-load operation.
Strong Mechanical Performance
The winding and magnetic core are mechanically reinforced to resist vibration, short-circuit forces, and transport stress, improving structural stability.
Customized Design Options
Voltage ratios, impedance values, and protection levels can be customized according to client specifications and site conditions, ensuring perfect compatibility with project requirements.
Global Standards Compliance
All ZTelec 35kV transformers are fully compliant with IEC 60076, GB 1094, and ANSI C57 international standards, ensuring reliability, interchangeability, and safe grid operation worldwide.
Application Scenarios
ZTelec 35kV oil-immersed power transformers are widely used across various industries and infrastructure systems:
Power substations and medium-voltage grid interconnection systems
Heavy industrial facilities such as steel, petrochemical, mining, and manufacturing plants
Renewable energy generation and grid integration for wind and solar systems
Railway traction and transportation power networks
Urban and rural power distribution networks
They ensure stable voltage regulation, high operational efficiency, and long service life, even under high temperature, humidity, or vibration conditions.
Technical Parameters of 35kV Three Phase Oil-Immersed Transformer
The following table lists the typical specifications for ZTelec China’s 35kV transformers. Custom designs and parameters can be provided upon request.
| Parameter | Specification |
|---|---|
| Rated Capacity | 630 kVA – 31500 kVA |
| Rated Primary Voltage | 35 kV (optional: 33 kV / 36 kV) |
| Rated Secondary Voltage | 10.5 kV / 6.3 kV / 0.4 kV or customized |
| Rated Frequency | 50 Hz / 60 Hz |
| Cooling Method | ONAN / ONAF |
| Connection Group | Dyn11 / YNd11 / YNyn0 |
| Impedance Voltage | 6% – 10% |
| Insulation Level | LI200AC85 / LI170AC70 |
| Temperature Rise | ≤ 65 K (oil) / ≤ 75 K (winding) |
| Protection Level | IP54 / IP55 optional |
| Loss (Typical) | No-load loss ≤ 0.35%, Load loss ≤ 1.2% |
| Dielectric Oil Type | Mineral insulating oil / Biodegradable ester oil |
| Cooling System Accessories | Oil conservator, radiator, thermometer, Buchholz relay |
| Standard Compliance | IEC 60076 / GB 1094 / ANSI C57 |
Why Choose ZTelec 35kV Power Transformer
With over 60 years of transformer manufacturing experience, ZTelec YUGUANG provides reliable power solutions for substations, renewable energy systems, and industrial distribution networks worldwide. Our 35kV three-phase oil-immersed transformer is designed for high efficiency, environmental safety, and long-term operational reliability.
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