Meidensha Corporation
Meidensha Scott Connection/ Roof Delta Connection Transformer


Model: Scott Connection/ Roof Delta Connection
Features
Railway feeding systems demand high-capacity, single-phase AC power. To comply with Japanese regulations banning direct single-phase extraction from high-voltage lines, we utilize specialized connection transformers. These systems efficiently generate two single-phase outputs from a three-phase supply without causing voltage fluctuations or unbalance on the receiving grid.
Housing-Free Design: Employs integrated soundproof walls for effective noise reduction without extra housing.
Compact Footprint: Optimized via advanced electric field strength analysis technology.
Scott-Connection Transformer: Full insulation design eliminates the need for a surge arrester.
Roof-Delta Connection Transformer: Delivers lower energy losses and a more compact design than conventional modified Woodbridge connections.
Applications and Solutions
Scott-connection transformer
Operators apply this transformer to neutral non-grounded high-voltage power networks (11 kV to 154 kV or less).
Roof-delta connection transformer
Operators apply this transformer to neutral-grounded ultra-high-voltage power networks (187 kV or less).
Specifications
Roof-delta connection transformer
| 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 connecti |
154 kV Scott-connection transformer
| 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 |












