Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of high voltage distribution transformer in China. If you're going to wholesale durable high voltage distribution transformer made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
The rated capacity of this transformer is 500 KVA, vector group is Dyn11 and it is ONAN cooled, the primary voltage is 33kV with ±2*2.5% tapping range (NLTC), the secondary voltage is 6.6kV.
Our High Voltage Distribution Transformer is a high-performance, oil-immersed three phase transformer designed for efficient medium-voltage power distribution. It is widely used to step down voltage from 11kV, 33kV, or higher levels to low voltage (e.g., 400V / 415V) for industrial, commercial, and residential applications.
Engineered with advanced electromagnetic design and premium materials such as grain-oriented silicon steel and high-conductivity copper windings, this transformer delivers low loss, low noise, and long service life. The oil-immersed structure ensures excellent insulation and heat dissipation, improving reliability under continuous operation.
With strict compliance to international standards (IEC, ANSI, IEEE), fast delivery capability, and full customization support, our transformers provide a dependable and cost-effective solution for global power distribution projects.
Technical Specifications
| Rated Power | 30 kVA – 5000 kVA |
| Phase | Three-phase / Single-phase |
| Primary Voltage | 6 kV – 35 kV Customized |
| Secondary Voltage | 0.4 kV / 0.415 kV / Customized |
| Frequency | 50 Hz / 60 Hz |
| Cooling Method | ONAN / ONAF |
| Vector Group | Dyn11 / Yyn0 (optional) |
| Winding Material | Copper / Aluminum |
| Impedance Voltage | 4% – 6% (customizable) |
| Tap Changer | ±2×2.5% or customized |
| Insulating Oil | Mineral oil / FR3 or customized |
Application Areas
Our high voltage distribution transformers are widely used in:
- Power distribution networks
- Industrial plants and factories
- Commercial buildings
- Residential communities
- Renewable energy systems (solar / wind)
- Infrastructure and utility projects
Distribution transformers play a key role in stepping down medium voltage to usable levels for end users, ensuring stable and efficient power supply.
Product Structure & Design Highlights
Core
High-permeability silicon steel reduces energy loss
01
Windings
Oxygen-free copper or aluminum for high conductivity
02
Tank
Corrugated or radiator type for enhanced cooling
03
Insulation System
Oil-paper insulation for high dielectric strength
04
Sealing
Fully sealed tank prevents moisture ingress and extends lifespan
05
The oil inside the transformer not only insulates internal components but also efficiently transfers heat to the tank surface for cooling, ensuring stable operation under heavy load.
Scope of Supply
Oil-immersed high voltage distribution transformer
Rated Power: Up to 5000 KVA
Primary Voltage: Up to 35 KV
Standard accessories (bushings, conservator optional, thermometer, etc.)
Test reports and technical documentation
Customization Options
We provide tailored transformer solutions based on your project
Voltage ratio customization (HV/LV)
Copper or aluminum winding options
Special loss requirements (low loss / eco design)
Tap changer (off-load / on-load)
Anti-corrosion or special environmental design
Compact or lightweight structure
high voltage distribution transformers ready to be delivered
Quality Assurance
Testing of high voltage distribution transformers
100% factory testing before shipment
Strict process quality control system
Compliance with IEC, ANSI, IEEE standards
Proven zero-failure manufacturing record
Each transformer undergoes routine tests including:
- Turns ratio test
- Insulation resistance test
- Load & no-load loss test
- Temperature rise test
Our Services
Pre-Sales Service
Professional transformer selection guidance
24/7 technical consultation
Fast customization design
After-Sales Service
12-month warranty (extendable)
Installation & maintenance support
Dedicated technical team response
Lifetime technical assistance
Packaging & Transportation
Export-standard wooden case or steel frame
Moisture-proof and shock-resistant packaging
Sea, air, and land transportation available
Full logistics tracking
Factory Strength
- Advanced CNC manufacturing equipment
- Strong R&D and engineering team
- Certified high-tech enterprise
- Stable supply chain & fast production
FAQ
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