Reliable Distribution Transformer Manufacturer for Efficient Power Systems

Huajidian distribution transformers are core equipment from Wenzhou Huajidian Technology Co., Ltd., a leading supplier of medium- and high-voltage power distribution products in China. Covering voltages from 6 kV to 35 kV, these transformers are designed for voltage transformation and power distribution, offering high efficiency, strong environmental adaptability, and stable performance. Manufactured according to IEC 60076 standards, they are available in both oil-immersed and dry-type models, widely deployed in rural power grids, industrial parks, and commercial buildings across Southeast Asia, the Middle East, Africa, and beyond.

Core Technical Parameters

Voltage Rating: 6 kV, 10 kV, 20 kV, 35 kV (customizable)
Capacity Range: 50 kVA – 2500 kVA
Energy Efficiency: IEC 60076-11, maximum efficiency up to 99.7%
Cooling Method: Oil-immersed (natural/forced), Dry-type (natural/forced air)
Insulation Class: Oil-immersed: Class A; Dry-type: Class F/H
Protection Class: Dry-type IP54, Oil-immersed IP20

Main Product Categories

1. Oil-immersed Distribution Transformers

These units use high-purity silicon steel sheets and low-impedance winding technology, combined with vacuum oil injection. This ensures excellent insulation and heat dissipation, reducing no-load loss by 40% compared to traditional transformers. Ideal for rural grids, industrial parks, and outdoor substations.

2. Dry-type Distribution Transformers

Using epoxy resin vacuum casting, these transformers are flame-retardant, explosion-proof, and pollution-free. Compact and easy to install, they are widely applied in commercial buildings, data centers, underground substations, schools, and hospitals.

Core Advantages

Authoritative Certifications and Strict Quality Control: ISO 9001/14001 certified partner factories, IEC 60076 and IEC 62271 compliant, CE/IECEx/ATEX certified. Full-process quality checks including incoming materials, in-process inspections, and factory testing.
High Efficiency and Energy Saving: Optimized core materials and winding structures reduce no-load loss by 30–50% and load loss by 20%, helping customers save electricity and achieve low-carbon operation goals.
Strong Adaptability and Stable Operation:
- Temperature range: -30℃ to +55℃
- Moisture and corrosion resistance with fully sealed oil-immersed units
- Low noise operation ≤50 dB
Professional Support and Full-Process Service: Customized solutions, certification assistance for SABER and SNI, warranty service, stocked spare parts, and efficient after-sales support.

Real-world Application Case

10 kV Power Grid Upgrade – Southeast Asian Village

Background: A rural grid in Indonesia suffered voltage drops and equipment tripping during peak hours, affecting 2,000 residents and small factories.

Solution: 12 units of 10 kV 500 kVA oil-immersed transformers. On-site surveys and a proprietary technical solution ensured fast installation and logistics.

Results: Installed and commissioned in 30 days. Voltage stability reached 99.8%, peak-hour tripping eliminated, and overall energy consumption reduced by 35%.

FAQ

Q1: Difference between oil-immersed and dry-type transformers?

A: Oil-immersed transformers use insulating oil for heat dissipation, suitable for outdoor and industrial settings, with simpler maintenance. Dry-type transformers use epoxy resin and air cooling, are flame-retardant, compact, and ideal for indoor and high-safety environments.

Q2: How is safety ensured in high-temperature/high-humidity environments?

A: Oil-immersed units are fully sealed; dry-type units have moisture-proof insulation. Equipment withstands -30℃ to +55℃ and up to 95% humidity. High-temp, humidity, and vibration tests are performed before shipment.

Q3: What after-sales guarantees are provided?

A: Standard two-year warranty, extendable by negotiation. Core spare parts are stocked globally, with 24/7 remote technical support. On-site service can be arranged within 72 hours for overseas projects.

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11kV 200kVA 3 Phase Distribution Transformer

Power System 1kV, 200kVA 3 phase

Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670

The Huajidian 11kV 200kVA 3 phase distribution transformer is a fully sealed oil-immersed power distribution device independently developed and manufactured by a professional domestic manufacturer. The product adheres to standardized production and stringent quality control throughout the entire process. Even in small-capacity models, no compromises are made on craftsmanship or materials, resulting in advantages such as low noise, high structural strength, weather resistance, corrosion resistance, maintenance-free operation, and customization. The equipment is suitable for various scenarios including residential power distribution, rural power grid upgrades, and small-to-medium-sized industrial and commercial projects. It boasts stable operation and a comprehensive after-sales service system, meeting the power distribution needs of both domestic conventional projects and overseas non-standard projects. It is a reliable and cost-effective device for high and low voltage power distribution engineering.

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1000kVA 11kV 433V Transformer

Power System 1000kVA, 11kV/433V, 50Hz/60Hz

Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670

Huajidian is a professional manufacturer of power distribution equipment, specializing in 1000kVA 11kV 433V transformers. Our products, manufactured using dedicated production lines and mature processes, boast stable performance, strong environmental adaptability, and flexible customization options. Fully compliant with international power standards, they are ideal for small and medium-sized factories, mines, rural areas, and infrastructure projects overseas. Our factory can handle large-volume orders and customized projects, ensuring on-time delivery. Coupled with comprehensive technical services and simplified after-sales maintenance, our products have gained widespread recognition from customers worldwide.

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10 kV 50 kVA Distribution Transformer

Power System 50kVA, 10kV/0.4kV, 50Hz/60Hz

Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670

Huajidian's independently developed and manufactured 10 kV 50 kVA distribution transformer is a cost-effective, energy-efficient, and durable power distribution device suitable for small and medium-sized power consumption scenarios. The product adopts a low-loss iron core and a fully sealed oil conservator structure, boasting advantages such as low operating losses, strong environmental adaptability, and easy operation and maintenance. As a professional manufacturer with many years of experience in the R&D and production of distribution transformers, all Huajidian products are strictly tested in accordance with national and IEC standards and are widely used in rural power grid renovation, small and medium-sized industrial and commercial projects, and power supply scenarios in remote areas of China. Based on its stable field performance and flexible customization services, this product has become the preferred power distribution equipment for small-scale projects with limited budgets, adaptable to various complex operating conditions, and providing stable and safe power supply.

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100kVA 3 phase distribution transformer

Power System 100kVA, 10kV/0.4kV, 50Hz/60Hz

Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670

As a professional manufacturer of power equipment, Huajidian launches the high-performance 100 kVA three-phase oil immersed distribution transformer. This 100kVA 3 phase distribution transformer adopts fully sealed corrugated tank design, strictly complies with IEC, ANSI and other international standards. With outstanding energy efficiency, low noise, strong weather resistance and long service life, it is widely applied in rural power grids, small construction projects and outdoor power distribution scenarios. As a reliable supplier based in China, our factory has kept a 10-year zero-failure record for delivered products, delivering stable and cost-effective power distribution solutions for global customers.

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11kV 433V 315kVA Distribution Transformer

Power System 315kVA, 11kV/433V, 50Hz/60Hz

Certifications IEC 62271-200, IEC 694, GB3906, DIN VDE 0670

Huajidian is a high-tech enterprise with its own factory, integrating R&D and production, and a leading supplier of high-quality power equipment in the industry. This 11kV 433V 315kVA distribution transformer is suitable for 50Hz AC medium-high voltage power systems and is a core power distribution device for regional substations, industrial and mining enterprises, and new energy power plants. The product uses high-permeability silicon steel sheets and oxygen-free copper windings, combined with a mature oil-immersed self-cooling process, offering advantages such as low loss, low noise, and strong short-circuit resistance. The company strictly adheres to IEC standards and customer customization requirements, balancing quality and cost-effectiveness. The equipment has been widely used in power grid upgrades, industrial production, and new energy projects in China and overseas, demonstrating stable and reliable operation.

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HUAJIDIAN TEC is a professional Distribution transformer manufacturer and supplier in China. We have an experienced sales team, professional technicians, and an after-sales service team.

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