The use of (single-phase) auto-transformers gives, compared to a system with booster-transformers, a lower voltage drop, higher power capability, and the possibility to place converter stations at greater distances from each other. The system (OCS) uses a second feeder (negative feeder) with a 180° phase difference from the contact wire, which doubles the voltage level of the system.
Advantages compared to single-phase feeding systems:
- Lower losses due to higher voltage
- A longer distance between catenary feeder substations
- Better collection of returning stray currents
- Reduced interference in communications
Product scope:
- Frequencies: 16.67, 25, 50, 60 Hz
- Power ratings: 4 - 15 MVA
- Single-phase
Why Hitachi Energy
- Compactly designed, low-weight transformers
- Solution for kiosk mounting with an integrated oil sump
