Overview
The SC(B)10 series dry-type power transformers are built around an epoxy resin vacuum casting process. Because the coils are cast in epoxy resin under vacuum, the transformer achieves excellent insulation performance with low partial discharge.
The iron core is made from high-quality cold-rolled silicon steel sheets using a good lamination process, which results in low no-load loss. The coils are made from materials with high electrical conductivity, giving low load loss and a good energy-saving effect.
After curing, the coils form a rigid whole, which gives strong short-circuit resistance and high mechanical strength. A noise reduction design is applied to both the iron core and the coils, so the operating noise is low. There is no need for insulating oil, which is the defining advantage of a dry-type transformer over an oil-immersed design.
Key Features
- Epoxy resin vacuum casting — the coils are produced by epoxy resin vacuum casting, giving excellent insulation performance and low partial discharge.
- Cold-rolled silicon steel core — high-quality cold-rolled silicon steel sheets are used for the iron core with a good lamination process, leading to low no-load loss.
- High conductivity coils — the coils are made from materials with high electrical conductivity, which results in low load loss and a good energy-saving effect.
- Rigid cast coil structure — after curing the coils form a rigid whole, giving strong short-circuit resistance and high mechanical strength.
- Low operating noise — noise reduction design applied to the iron core and coils keeps the operating noise low.
- No insulating oil — a dry-type design requires no insulating oil, which simplifies installation and reduces fire risk compared with an oil-immersed transformer.
Technical Specifications
| Model | SC(B)10 series |
|---|---|
| Product type | Dry-type power transformer (cast resin) |
| Coil manufacturing | Epoxy resin vacuum casting process |
| Insulation performance | Excellent insulation performance with low partial discharge |
| Iron core material | High-quality cold-rolled silicon steel sheets, good lamination process |
| No-load loss | Low, as a result of the core material and lamination process |
| Load loss | Low, as a result of high conductivity coil materials |
| Coil structure | Rigid whole after curing; strong short-circuit resistance and high mechanical strength |
| Noise | Low operating noise through iron core and coil noise reduction design |
| Insulating oil | Not required |
Applications
- Indoor distribution — installations where an oil-free transformer is preferred for fire safety.
- Commercial and public buildings — distribution inside occupied buildings where oil is not acceptable.
- Industrial facilities — power supply for manufacturing and processing plants.
- Renewable energy and infrastructure — distribution in solar, wind and infrastructure projects.
Installation Conditions
- No insulating oil is required, so no oil containment or bunding arrangement is needed.
- Because the coils form a rigid cast structure, the transformer is mechanically robust, but it should still be positioned on a level foundation.
- Maintain the clearances required for ventilation around the transformer so the heat generated by the coils and core is dissipated.
- Allow access for cable termination and for inspection of the windings.
How to Select
- Capacity required in kVA.
- Primary and secondary voltage.
- Vector group and impedance (%Z).
- Cooling type and whether forced air cooling is required.
- Installation environment and the protection requirements of the location.
FAQ
What is the advantage of epoxy resin vacuum casting?
Casting the coils in epoxy resin under vacuum produces excellent insulation performance with low partial discharge. After curing, the coils also form a rigid whole, which gives strong short-circuit resistance and high mechanical strength.
Why is the no-load loss of this transformer low?
The iron core is made from high-quality cold-rolled silicon steel sheets using a good lamination process. This combination is what keeps the no-load loss low.
Why is the load loss low?
The coils are made from materials with high electrical conductivity, which reduces the resistance of the winding and therefore the load loss, giving a good energy-saving effect.
Does a dry-type transformer need insulating oil?
No. There is no need for insulating oil in a dry-type transformer, which is the main difference from an oil-immersed design and removes the need for oil containment at the installation.
How is the noise level kept low?
A noise reduction design is applied to both the iron core and the coils of the transformer, so the operating noise is low.
Where is a dry-type transformer normally installed?
Dry-type transformers are normally chosen for indoor distribution and for commercial, public and industrial buildings where an oil-free transformer is preferred, since no insulating oil is required.
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