Oil-Immersed Transformer | Reliable Power Distribution by ZTelec Yuguang
The oil-immersed transformer is one of the most widely used types of power transformers in the global energy industry.
It provides efficient heat dissipation, excellent insulation, and reliable operation for long-term power distribution.
As a professional transformer manufacturer, ZTelec Yuguang supplies a full range of oil-immersed transformers for industrial, commercial, and utility applications.
What Is an Oil-Immersed Transformer?
An oil-immersed transformer uses insulating oil as both a cooling and dielectric medium.
The oil circulates through the core and winding to remove heat and improve insulation strength, ensuring stable operation even under heavy load or harsh environments.
- Excellent cooling performance with natural or forced oil circulation
- Low noise and high mechanical strength
- Stable performance and extended service life
- Complies with IEC 60076 and ANSI C57 standards
Main Types of Oil-Immersed Transformers
Distribution Transformers
These are used in medium- and low-voltage networks to deliver power to factories, buildings, and communities.
Typical capacities range from 100kVA to 2500kVA.
Amorphous alloy transformer
Power Transformers
Designed for transmission and high-capacity stations, power transformers support voltages from 400V to 35kV, offering high reliability and low energy loss.
oil-immersed type transformer
Sealed or Hermetically-Type Transformers
The transformer tank is completely sealed to prevent moisture ingress and oil oxidation, suitable for humid or outdoor environments.
ZTELEC Electric Technology (Zhengzhou) Co., Ltd
On-Load Tap Changer (OLTC) Transformers
These allow voltage adjustment under load conditions, ensuring constant voltage delivery even with network fluctuations.
ztelecgroup oil transformer
Technical Parameters
| Item | Specification |
|---|---|
| Rated Capacity | 100kVA–2500kVA (customizable) |
| Primary Voltage | 6kV / 10kV / 11kV / 35kV |
| Secondary Voltage | 0.4kV / 0.415kV |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN / ONAF (Oil Natural / Air Forced) |
| Impedance Voltage | 4% ±10% |
| No-load Loss | ≤ 1.1 kW |
| Load Loss | ≤ 9.0 kW |
| Efficiency | ≥ 98.5% |
| Insulation Class | Class A (Oil-filled insulation) |
| Protection Grade | IP23–IP54 (customized) |
| Cooling Medium | Mineral Oil / Synthetic Ester |
| Applicable Standard | IEC 60076 / GB 1094 / ANSI C57 |
| Manufacturer | ZTelec Yuguang – Transformer & Insulation Material Manufacturer |
Oil-Immersed Transformers Applications
ZTelec Yuguang’s oil-immersed transformers are widely used across power distribution and industrial systems where high reliability is required.
- 🏭 Industrial plants and manufacturing workshops
- 🏢 Commercial and residential distribution networks
- ⚡ Power generation and substation systems
- 🌞 Renewable energy (solar and wind) integration
- 🚧 Infrastructure and construction projects
Three-phase Outdoor 10KV 2.5mva Oil Immersed Converter Distribution Transformer
ZTelec Yuguang Oil-Immersed Transformers Advantages
- High-quality silicon steel and copper winding materials
- Excellent insulation system using G10/G11 epoxy and aramid paper
- Low partial discharge, high dielectric strength
- Factory direct price with fast global delivery
- Customization available for voltage, capacity, and cooling type
ZTelec Yuguang also produces a full range of Dry-Type Transformers and Pad-Mounted Transformers,
providing complete power solutions for customers worldwide.
Why Choose ZTelec Yuguang
With over 20 years of manufacturing experience, ZTelec Yuguang is a trusted global supplier of transformers and electrical insulation materials.
We provide integrated R&D, production, and export services.
- ✅ ISO, CE, and UL certified factory
- ✅ Global exports to 50+ countries
- ✅ Custom engineering and OEM service
- ✅ Complete insulation material supply chain
- ✅ Strong technical support and after-sales service
Contact ZTelec Yuguang
For your next oil-immersed transformer project, contact ZTelec Yuguang for a free technical consultation and quotation.
