For railways Scott-connection transformer / Roof-delta connection transformer
This transformer converts three-phase power (special high pressure or ultra-high pressure) to two sets of single-phase power supply. Electric railway specific transformer
Product Features
For AC power feeding system for railways, it requires a large capacity single phase AC power supply. However, in Japan, by regulations, it is not allowed to produce single-phase power from a single-phase high-voltage or ultra high-voltage. Therefore, it is necessary to produce single-phase power from a three-phase high-voltage or ultra high-voltage power.
Given above, a special connection transformer has been adopted. This effectively makes 2 sets of single-phase power from the three-phase power without giving the bad effect of voltage fluctuation or three-phase voltage unbalance at the the power-receiving side.
- Housing-free design by using a soundproof wall for noise reduction
- Compact design by our electric field strength analysis technology
- The scott-connection transformer makes a surge arrester unnecessary due to its full insulation design.
- The roof-delta connection transformer realizes lower energy loss and compact design compared with a conventional modified Woodbridge connection
Applications and Solutions
Scott-connection transformer
This transformer is applied to a neutral non-grounded high-voltage power network (equal or less than 11 kV to 154 kV ).
Roof-delta connection transformer
This transformer is applied to a neutral grounded ultra high-voltage power network (187 kV or less).
Specifications
| Item | Rated specification |
|---|---|
| Application | For power feeding a Shinkansen train |
| Type | Oil immersed self-cooling type (with a soundproof wall) |
| Rated capacity | 70MVA |
| Rating type | 300% 2 min |
| Rated primary voltage | 220kV |
| Connection | Roof-delta connection |
| Item | Rated specification |
|---|---|
| Application | For power feeding a Shinkansen train |
| Type | Oil immersed self-cooling type (with a soundproof wall) |
| Rated capacity | 50MVA |
| Rating type | 300% 2 min |
| Rated primary voltage | 154kV |
| Connection | Scott connection |
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