Source: https://news.railanalysis.com/kolkata-metro-energises-blue-lines-first-33kv-traction-substation-with-dc-breaker-panel/
Publisher: Rail Analysis India
Kolkata Metro has energised its first 33kV Traction Substation on the Blue Line, featuring India’s longest DC breaker panel and 12-pulse rectifier. This modernised system replaces a 40-year-old 11kV substation, improving reliability, efficiency, and headway capacity. The project marks a major upgrade towards energy efficiency and sustainability.
Introduction:
On October 14, 2024, Shri P. Uday Kumar Reddy, General Manager of Metro Railway Kolkata, energised the first 33kV Traction Substation for the Blue Line. This milestone includes the introduction of India’s largest DC breaker panel and 12-pulse rectifier, replacing the outdated 11kV system at Noapara.
Details of the Upgraded Substation:
The state-of-the-art Traction Substation now features 33kV Gas Insulated Switchgear (GIS), the longest High-Speed Circuit Breaker (HSCB) panel, and an IGBT-based regenerative battery charger. The new 3MW twelve-pulse rectifier has 50% more capacity than the old six-pulse rectifier system, improving headway requirements.
Project Timeline and Execution:
Planning for the substation replacement began in July 2024, with day-wise tracking to ensure smooth execution. The project, which commenced in August, was completed in just two months without disrupting Noapara station or the Car-Shed. Final testing concluded in October, with approval from government inspectors.
Benefits of the 33kV Upgrade:
The upgrade from 11kV to 33kV brings numerous advantages, including higher reliability, reduced distribution loss, and environmental benefits.
By eliminating the old 11kV cables, Metro Railway will save on energy costs, reduce core losses in transformers, and enhance overall system efficiency.
Future Plans for Substation Upgrades:
Following the success at Noapara, Kolkata Metro plans to upgrade Belgachia and Dumdum substations by the end of February 2025.
The estimated savings from equipment and energy costs are expected to be around ₹350 crores for the entire Blue Line.
Conclusion:
Kolkata Metro’s 33kV substation upgrade marks a significant step in improving operational efficiency and sustainability. With the success of Noapara’s substation, similar upgrades will follow at Belgachia and Dumdum, ensuring enhanced service for the growing Blue Line network, while also contributing to long-term energy savings.
