Engineering Overview
As part of the national clean power transmission upgrade, WIN-TEC was awarded the complete electromechanical erection and commissioning of the 220kV Polpitiya grid substation expansion bay, incorporating two 250MVA auto-transformers and associated switchyard gantry structures.
The Challenge
Working inside an energized 220kV switchyard environment demanded zero-tolerance electrical clearance safety boundaries, live induction mitigation, and precision crane coordination near overhead high-voltage transmission conductors.
The Engineering Solution
Our chartered safety and substation engineers instituted a rigorous 3-tier permit-to-work (PTW) lock-out/tag-out system with mobile laser perimeter alarms. All heavy transformer haulage and erection was executed during planned weekend transmission outages without interrupting regional supply.
Key Scope & Technical Deliverables
- 2 x 250MVA 220/132/33kV three-phase power transformers erection
- 220kV SF6 outdoor circuit breakers, disconnector switches, and CT/VTs
- Numerical distance and differential protection relay panels integration
- Control cabling, trenching, and substation earthing mesh testing
- Comprehensive dielectric breakdown, sweep frequency response (SFRA), and turn-ratio testing
Project Results & Impact
Project Quick Facts
- Client Ceylon Electricity Board (CEB)
- Location Polpitiya, Central Province
- Category power
- Completion Year 2022
- Contract Duration 18 Months