66kV High Voltage Oil-immersed Power Transformer
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Voltage Level
66kV
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Rated Capacity
Customizable
|
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Cooling Method
ONAN / ONAF
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Application
Power Transmission & Substations
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Warranty 1 year
Product Overview
The 66–500kV high voltage oil-immersed power transformer is designed for power transmission systems, substations, industrial power networks, renewable energy grid connection, and large-scale infrastructure projects. It supports voltage step-up and step-down for stable power transmission under high-load operating conditions.
With a mature oil-immersed structure, strong insulation performance, efficient heat dissipation, and reliable mechanical strength, this transformer series is suitable for long-distance power transmission, regional grid substations, industrial power supply systems, and high-voltage energy projects.
DHDL provides customized high voltage transformer solutions according to project voltage level, rated capacity, voltage ratio, cooling method, impedance requirement, insulation level, protection accessories, installation environment, and applicable grid standards.
Technical Specifications
| Item | Specification |
|---|---|
| Product Type | High Voltage Oil-immersed Power Transformer |
| Voltage Range | 66kV / 110kV / 220kV / 330kV / 500kV |
| Application | Substations, transmission lines, industrial power systems, renewable energy grid connection, and key infrastructure projects |
| Cooling Method | ONAN / ONAF / OFAF, customizable according to project requirements |
| Installation | Outdoor / Substation installation |
| Customization | Voltage level, rated capacity, impedance, cooling method, insulation level, accessories, and project standards can be customized |
Technical Parameters
| Voltage Level | Typical Application | Recommended Use |
|---|---|---|
| 66kV | Urban and township substations, medium industrial power supply, renewable energy grid connection, and infrastructure power supply. | Suitable for medium-distance transmission, regional distribution, and power supply systems for cities, towns, and medium-sized industrial users. |
| 110kV | Regional substations, industrial high-voltage power supply, urban distribution networks, and renewable energy station grid connection. | Suitable for large-capacity regional power transmission, industrial power supply, and stable grid connection for renewable energy projects. |
| 220kV | Long-distance transmission lines, large industrial enterprises, regional high-voltage substations, wind farms, and solar power plants. | Suitable for high-capacity power transmission, large-load industrial systems, and grid connection for large-scale renewable energy projects. |
| 330kV | Extra-high voltage transmission lines, large regional substations, centralized renewable energy transmission, and large infrastructure power supply. | Suitable for long-distance and high-load transmission systems that require stable operation and high insulation performance. |
| 500kV | Extra-high voltage transmission lines, large regional or national key substations, renewable energy grid connection, high-voltage industrial loads, and critical infrastructure. | Suitable for major power infrastructure, long-distance bulk power transmission, and key grid projects requiring high reliability. |
Note: Rated capacity, voltage ratio, impedance, cooling method, insulation level, loss data, dimensions, and accessories can be customized according to project requirements and applicable grid standards.
Product Features
High Reliability
Designed for stable operation in high-voltage power systems, with strong short-circuit withstand capability and reliable long-term performance.
Low Loss & High Efficiency
Optimized core and winding design help reduce no-load loss and load loss, improving energy efficiency and operating economy.
Excellent Heat Dissipation
Efficient cooling design supports continuous operation under high-load conditions and helps maintain stable transformer performance.
Strong Insulation Performance
High insulation level improves operational safety and reliability in medium-, high-, and extra-high-voltage power systems.
Mature and Stable Structure
Reliable oil-immersed structure supports long service life, stable operation, and easier maintenance in substations and transmission systems.
Custom Engineering Design
Voltage level, capacity, cooling method, impedance, insulation level, accessories, and grid standards can be customized.
Factory Test Items
| Test Item | Test Type |
|---|---|
| Insulation Resistance Test | Routine Test |
| Winding DC Resistance Test | Routine Test |
| Voltage Ratio Test | Routine Test |
| Vector Group Test | Routine Test |
| No-load Loss and No-load Current Test | Routine Test |
| Load Loss and Impedance Voltage Test | Routine Test |
| Power Frequency Withstand Voltage Test | Routine Test |
| Induced Withstand Voltage Test | Routine Test |
| Sealing Test | Routine Test |
| Transformer Oil Test | Routine Test |
| Appearance and Nameplate Inspection | Routine Test |
| Packing Inspection Before Shipment | Routine Test |
Applications
Utility Distribution Networks
Reliable transformer solutions for urban and rural power distribution systems, helping ensure stable voltage conversion and continuous power supply.
Industrial Facilities
Suitable for factories, workshops, production lines, mining sites, and industrial power systems that require long-term stable operation.
Renewable Energy Projects
Applied in solar power plants, wind farms, energy storage stations, and microgrid systems for power conversion and distribution.
AI Data Center Power Infrastructure
Suitable for data center campus substations, medium-voltage power intake systems, and reliable power distribution infrastructure supporting high-density computing loads.
Why Choose DHDL Transformer
DHDL provides reliable transformer manufacturing, strict quality control, and project-based technical support for power distribution, industrial, commercial, and renewable energy applications.
Manufacturing Capability
- Transformers
- Distribution Cabinets
- Prefabricated Substation
- Energy Storage Cabinets
- Charging Piles
Quality Control
- Material inspection
- Winding and assembly control
- Drying and oil treatment process
- Routine testing
- Final inspection before delivery
International Standards
- IEC
- ANSI
- IEEE
- GB
- Project-specific technical requirements
Choose a dry-type transformer for indoor or high fire-safety applications, and choose an oil-immersed transformer for outdoor use, heavy loads, cost-sensitive projects, industrial power distribution, grid projects, and overseas engineering applications.
The safety risk mainly comes from design and manufacturing quality rather than the transformer structure itself, and with proper design, sealed construction, leakage prevention, and optional protection solutions, oil-immersed transformers remain a widely used choice in global power grids.
Transformer prices vary mainly because of material choices, copper or aluminum windings, silicon steel grade, loss level, energy efficiency, and whether the design is based on real operating conditions.
Yes, oil-immersed transformers are especially suitable for unstable grids and harsh environments because they offer strong temperature adaptability, stable structure, and optional anti-corrosion and moisture-resistant designs.
Instead of only providing parameters and quotations, we focus on matching the transformer to your actual load, avoiding over-configuration or under-configuration, and helping reduce long-term operating costs.
By sending an inquiry, you can quickly confirm whether your transformer selection is correct, whether there is a lower-cost alternative, and whether there are potential operating risks before making a costly decision.
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