Sepac - Traction Rectifiers
SEPAC CORPORATION has extensive experience in handling traction rectifier contracts for main line, suburban, underground, rapid transit, tramway, trolleybus and mining railways. In these last years the designs have advanced in line with modern digital technology and techniques. Many Equipment are supplied as part of a comprehensive contract involving transformers, rectifiers, a.c. and d.c. switchgear, supervisory control and auxiliary equipment. Modernization with silicon rectifier replacements for ageing mercury arc equipment have also been undertaken.
The majority of d.c. traction systems employ a nominal track supply of 600-750 Volts although sets of up to 500kW operating at 3000 Volts have been supplied. Rectifiers for traction services are usually naturally air cooled for quiet operation and enhanced reliability. Where this mode of cooling in not possible alternative arrangements such as forced air cooling and closed-air circuit designs are available.