Huajidian oil immersed transformers are the core product of Wenzhou Huajidian Technology Co., Ltd. These highly efficient and reliable devices are suitable for high and low voltage power distribution, adaptable to complex operating conditions and heavy-load scenarios. Manufactured by qualified enterprises in Wenzhou (China's electrical capital), these transformers feature a fully sealed structure, excellent heat dissipation, strong overload capacity, and full compliance with international standards such as IEC 60076.
As a professional power equipment supplier, Huajidian provides customized solutions for power grid companies, industrial parks, and power plants in Southeast Asia, the Middle East, Africa, and North America. The products operate stably in high-temperature, high-humidity, and salt spray environments.
Huajidian oil immersed transformers utilize mature design and manufacturing processes. The core, windings, and other core components are completely immersed in high-performance insulating oil, which provides both insulation and heat dissipation. The product range covers voltage levels from 6 kV to 330 kV and capacities from 30 kVA to 500 MVA, enabling both step-up and step-down power transformation. Widely used in power grid upgrades, industrial parks, mining enterprises, and large-scale power transmission projects, it is a core piece of equipment in power distribution systems.
Utilizes high-permeability, oriented cold-rolled silicon steel sheets with automated lamination technology, effectively reducing no-load losses and operating noise.
High-voltage windings use high-quality enameled copper wire, while low-voltage windings employ copper foil winding technology, resulting in excellent short-circuit withstand capability.
Provides both insulation and heat dissipation, with a heat dissipation efficiency 40% higher than dry-type transformers.
Constructed from corrosion-resistant steel plates with corrugated heat sinks, automatically compensating for volume changes caused by thermal expansion and contraction of the insulating oil.
The insulating oil circulates naturally, removing heat from the equipment. Short-term overload capacity can reach 120%–150% of the rated load, suitable for peak electricity consumption periods and harsh operating conditions. The top oil temperature rise is ≤55 Kelvin, ensuring long-term stable operation.
The fully sealed structure prevents moisture and dust intrusion, and the product is designed for a service life exceeding 30 years. The core and windings undergo vacuum drying to thoroughly remove internal moisture, and the reinforced structure can withstand short-circuit impacts.
Compared to dry-type transformers, the production and overall operation and maintenance costs of this product can be reduced by 30%–50%. The fully sealed design essentially eliminates maintenance, requiring only periodic oil quality checks, significantly reducing subsequent operating expenses.
The equipment can operate stably in a temperature range of -40℃ to +55℃, unaffected by high humidity, salt spray, and dusty environments, making it perfectly suited for coastal areas of Southeast Asia and desert regions of the Middle East.
In 2024, Huajidian provided eight 35kV/10kV oil immersed transformers for a heavy industrial park in Surabaya, Indonesia. The region has a humid climate with high rainfall, and the equipment was under heavy load for extended periods.
Thanks to its excellent moisture-proof sealing performance and strong overload capacity, this batch of equipment operated without failure during the typhoon season, ensuring continuous production for more than 20 manufacturing companies in the park. Customer feedback indicates a 15% reduction in monthly electricity costs compared to older equipment.
Huajidian has signed exclusive agency and long-term strategic cooperation agreements with several leading manufacturers in Wenzhou, strictly implementing a three-tiered quality control system:
100% inspection of all raw materials, including silicon steel sheets, copper wire, and insulating oil, to ensure compliance with international standards.
Full-process monitoring of key steps such as winding, drying, and oiling to standardize production processes.
Each piece of equipment undergoes a full set of tests before leaving the factory, including full voltage, full load, and short-circuit withstand tests, with test reports issued.
Products possess ISO 9001/14001 system certification and IEC 60076 type test reports, and also comply with CE, IECEx, ATEX, and other standards. We can assist customers with market access certifications in countries such as Saudi Arabia (SABER) and Indonesia (SNI).
A: Oil-immersed transformers rely on insulating oil for heat dissipation, resulting in high heat dissipation efficiency, large single-unit capacity, and lower cost. They are suitable for outdoor, heavy-load, and harsh environments. Dry-type transformers use air as the heat dissipation medium, have smaller capacity, and are more expensive, but offer excellent fire resistance and are mostly used indoors and in locations with high fire protection requirements. Huajidian can match the appropriate model for your application scenario.
A: Yes. We support personalized customization of voltage levels, equipment capacity, cooling methods, and insulating oil types. For special needs such as high altitude, extreme cold, high temperature, and corrosion resistance, we can adjust the materials and equipment structure to ensure stable operation of the product in extreme environments.
Power System 15000kVA, 50Hz/60Hz, Three Phase
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System 4000kVA, 50Hz/60Hz, Three Phase
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System 2500kVA, 50Hz/60Hz, Three Phase
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System 1600kVA, 50Hz/60Hz, Three Phase
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
Power System Three Phase, 50Hz/60Hz
Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670
