35 kV Oil-Immersed Transformer

Oil-Immersed Transformers for Reliable Power Distribution

Oil-immersed transformers are available in a wide range of capacities and configurations, making them suitable for both medium-scale and large-scale power applications. Designed to meet the demands of modern power systems, these transformers comply with major international standards including IEC, ANSI, and GB, ensuring stable performance, safety, and global compatibility.

With flexible design options, oil-immersed transformers can be customized to meet specific voltage levels, power ratings, cooling methods, and environmental conditions. They are widely used across industrial facilities, commercial buildings, and utility substations, providing cost-effective and durable solutions that help optimize energy distribution networks.

Transformer Capacity Range

We specialize in medium- and large-capacity oil-immersed transformers tailored for industrial and utility-scale power systems. The minimum standard capacity for oil-immersed transformers is 630 kVA. For large-scale and complex applications, we have extensive experience in manufacturing high-capacity transformers exceeding 5000 kVA, delivering customized solutions for demanding grid and substation environments.

Although low-capacity transformers below 630 kVA, such as conventional distribution transformers, can be manufactured, they are not supplied as standalone products. These units are only provided as part of an integrated solution combined with medium- or large-capacity transformers, ensuring optimal system coordination and performance.

Product Features and Standards Compliance

Our oil-immersed transformers are developed through the absorption and integration of advanced domestic and international technologies. Designed specifically for urban and rural power grid transformation, their overall performance exceeds the requirements of GB/T 6451 and fully complies with national standards such as GB 1094 as well as international IEC standards.

Significant Energy Savings

Using advanced computer simulation and optimization software, oil-immersed transformers are engineered for high energy efficiency. These products exceed national energy-saving standards, helping users significantly reduce operational losses. In power substations and long-term operation scenarios, the energy-saving benefits can lead to substantial cost reductions over a ten-year service period.

High Electrical, Mechanical, and Thermal Strength

The transformers feature excellent electrical insulation performance, achieved through precise winding layout design and detailed electric field calculations. Mechanical strength is enhanced through rigorous testing and structural optimization, allowing the transformer to withstand extreme conditions such as short-circuit impacts.

Thermal performance is further improved by advanced fluid dynamic analysis and optimized cooling structures. These measures ensure effective heat dissipation and maintain safe operating temperatures even during continuous or heavy-load operation.

Low Partial Discharge Performance

To protect the insulation system and extend service life, the transformers are designed with extremely low partial discharge levels. Accurate static electric field calculations and the use of high-quality insulating materials significantly reduce partial discharge, ensuring stable and reliable operation under normal and stressed conditions.

Low Noise Design

With increasing emphasis on environmental protection and user comfort, oil-immersed transformers are engineered for low noise operation. By utilizing high-permeability silicon steel cores and optimized low-noise cooling fans, overall noise levels are reduced by approximately 8–10 dB below national standards, making them suitable for urban and noise-sensitive installations.

High Reliability and Long Service Life

Supported by advanced manufacturing technology and a comprehensive quality assurance system, these oil-immersed transformers deliver low loss, low noise, low partial discharge, and high operational reliability. Their performance meets the stringent requirements of both domestic and international markets, ensuring long service life and stable power supply.

35kV Oil-Immersed Transformer Technical Overview

35kV oil-immersed transformers are available in multiple capacity options and structural configurations to meet different grid and substation requirements. Fully compliant with IEC, ANSI, and GB standards, they offer excellent electrical performance, robust mechanical strength, and strong environmental adaptability.

By combining cost-effective design with durable construction, these transformers provide an ideal solution for industrial plants, commercial facilities, and utility power systems seeking reliable and efficient energy distribution.