800 kVA 11 kV Oil Immersed Transformer
Nov 10, 2025
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Product Overview
The rated power of the oil transformer is 800 kVA. It is a step-down transformer from 11 kV to 550 V: the primary voltage is 11 kV and the secondary voltage is 550 V. The transformer has a reasonable arrangement of oil tubes and connections, which increases the mechanical strength and short-circuit withstand capability. The 800 kVA distribution transformer is designed with advanced technology and adopts high-quality materials and components, which results in reliable quality and long operation time.
Technical Specification
| Item | Detail |
|---|---|
| Model | S11-800 kVA-11/0.55 kV |
| Type | Oil immersed transformer |
| Standard | IEC 60076 |
| Rated power | 800 kVA |
| Frequency | 50 Hz |
| Phase | Three |
| Cooling type | ONAN |
| Primary voltage | 11 kV |
| Secondary voltage | 550 V |
| Winding material | Copper |
| Vector group | Dyn11 |
| Impedance | 4.5% |
| Tap changer | NLTC |
| Tapping range | plus/minus 2 x 2.5% |
| No-load loss | 0.98 kW |
| Load loss | 7.5 kW |
| Accessories | Standard configuration |
Applications
Industrial and commercial: powers factories, chemical plants, and commercial buildings.
Residential: provides electricity to residential areas and housing complexes.
Utility: used by grid companies for distribution networks and infrastructure projects.
Specialized sectors: found in locations such as mines, hospitals, and airports.
Power projects: utilized in power stations and photovoltaic projects.
Transformer Bushing
When the lead wire of the transformer winding passes through the oil tank cover from the oil tank, it must pass through an insulation bushing so that the live lead wire is insulated from the grounded oil tank. Insulated bushings are generally made of porcelain, and their structure depends on the voltage class. Higher voltage classes require longer and larger bushings with improved creepage performance.
How to Identify Transformer Oil
1. Color: new oil is generally light yellow with no sediment.
2. Transparency: the higher the transparency, the better the oil.
3. Smell: qualified oil has no smell, or only a little kerosene smell.
Routine checks also include dielectric strength testing and moisture measurement to confirm the oil remains fit for service.
Frequently Asked Questions
Q: What is the rating of this transformer? A> 800 kVA, three-phase, 50 Hz, 11 kV/550 V, ONAN cooling.
Q: What is the vector group? A> Dyn11, with plus/minus 2 x 2.5 percent off-circuit tapping.
Q: What are the losses? A> No-load loss 0.98 kW and load loss 7.5 kW.
Q: What standard applies? A> IEC 60076.
Q: Why is a bushing needed? A> To insulate the live lead wire from the grounded oil tank where it passes through the cover.
Q: How is oil quality checked? A> By color, transparency, smell, and routine dielectric and moisture tests.
Need an 800 kVA or other capacity oil immersed transformer? Contact us with your rating, voltage, and standard for a quotation.