Feeding schemes are adopted to the specific power requirements, return current circuit design, restrictions with regards to electromagnetic compatibility and other relevant factors. Traditionally, a single-phase feeding scheme with a return current circuit along the line or with booster transformers is used. However for railway lines with a high power demand, in particular high speed lines or heavy haul freight lines, two-phase systems with autotransformer substations provide the most favourable performance.
Hitachi Energy portfolio covers the complete scope from the grid connection to the overhead contact line:
- Electrical, mechanical and civil design of the substations
- Grid compliant solutions
- High voltage switchgear
- Traction power transformers
- Medium-voltage switchgear and components
- Substation automation systems (protection, local and remote control)
- Auxiliary power supply
- Power quality equipment
- Service and maintenance contracts
Special emphasis is placed on optimizing the footprint of the substations and on having a high degree of pre-fabrication by adopting a modular design.
Hitachi Energy provides a comprehensive range of pre-fabricated high voltage and medium voltage modules, thus reducing on-site installation and commissioning works significantly.