6–38.5kV Oil-immersed Distribution Transformer
|
Voltage Range
6–38.5kV
|
Rated Capacity
30–2500kVA
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|
Transformer Type
Oil-immersed
|
Application
Power Distribution
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Warranty 1 year
Product Overview
The 6–38.5kV oil-immersed distribution transformer is designed for reliable power distribution in utility grids, industrial facilities, renewable energy projects, outdoor substations, and infrastructure power systems. It uses transformer oil as both the insulation and cooling medium, providing stable operation under long-term load conditions.
With mature structure, excellent heat dissipation performance, and strong overload capability, this transformer is suitable for outdoor installation and demanding operating environments. It can support voltage step-up, step-down, and safe power transmission in medium-voltage distribution networks.
This series can be customized according to project requirements, including voltage level, rated capacity, tap range, vector group, protection accessories, cooling method, installation environment, and applicable standards. DHDL provides project-based transformer solutions for stable and efficient power distribution.
Technical Specifications
| Item | Specification |
|---|---|
| Product Type | Oil-immersed Distribution Transformer |
| Voltage Range | 6–38.5kV |
| Rated Capacity | 30–2500kVA |
| Low Voltage | 0.4kV |
| Vector Group | Dyn11 / Yyn0 / Yzn11 |
| Tap Range | ±5% / ±2×2.5% |
| Cooling Medium | Transformer Oil |
| Installation | Outdoor / Indoor Transformer Room |
Technical Parameters
| Rated Capacity (kVA) |
High Voltage (kV) |
Tap Range | Low Voltage (kV) |
Vector Group | No-load Loss (W) |
Load Loss (W) |
No-load Current (%) |
Short-circuit Impedance (%) |
|---|---|---|---|---|---|---|---|---|
| 50 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 170 | 1200 | 2.1 | 6.5 |
| 100 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 230 | 2010 | 2.0 | 6.5 |
| 125 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 270 | 2370 | 1.5 | 6.5 |
| 160 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 290 | 2820 | 1.4 | 6.5 |
| 200 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 340 | 3320 | 1.3 | 6.5 |
| 250 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 400 | 3950 | 1.2 | 6.5 |
| 315 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 480 | 4750 | 1.1 | 6.5 |
| 400 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 580 | 5740 | 1.0 | 6.5 |
| 500 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 680 | 6910 | 1.0 | 6.5 |
| 630 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 830 | 7860 | 0.9 | 6.5 |
| 800 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 980 | 9400 | 0.8 | 6.5 |
| 1000 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 1150 | 11500 | 0.7 | 6.5 |
| 1250 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 1400 | 13900 | 0.6 | 6.5 |
| 1600 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 1690 | 16600 | 0.6 | 6.5 |
| 2000 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 1990 | 19700 | 0.6 | 6.5 |
| 2500 | 33 / 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | Dyn11 / Yyn0 | 2360 | 23200 | 0.6 | 6.5 |
Note: The above parameters are for 50–2500kVA 33–38.5kV oil-immersed transformers. Final technical data can be customized according to project requirements and applicable standards.
Product Features
Strong and Reliable Structure
The transformer adopts a high-strength oil tank structure with excellent mechanical strength and strong short-circuit withstand capability.
Low Operating Noise
Optimized core structure and manufacturing process help effectively reduce operating noise and improve operation comfort.
Convenient Maintenance
The reasonable structural design makes daily inspection and maintenance easier, helping reduce long-term operation and maintenance costs.
Strong Environmental Adaptability
Suitable for complex operating environments such as high temperature, high humidity, high altitude, and outdoor power distribution sites.
High Safety Performance
Complete protection devices can be configured to improve operational safety, equipment reliability, and long-term system stability.
Customized Design Available
DHDL can customize transformer design according to different national grid standards, project requirements, and customer specifications.
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
- Oil immersed transformers
- Dry type transformers
- Pad mounted transformers
- Distribution transformers
- Power transformers
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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