Sector
Power Infrastructure
Location
Primorsko, Municipality of Primorsko
Date of assignment: July, 2025
Completion date: April, 2026
The project comprised the complete reconstruction and modernization of the 110 kV switchyard at Primorsko 110/20 kV Substation, including the implementation of a Substation Automation System (SAS) enabling fully remote operation and monitoring.
Scope of Works
Demolition Works
Removal and disposal of the existing outdated 110kV switchyard infrastructure, including: primary equipment, reinforced concrete foundations, gaintry structures.
Civil and Structural Works
Construction of:
- Steel lattice gantries and gaintry structures
- Reinforced concrete foundations
- Supporting steel structures
- Cable trenches and duct banks
- Underground conduit networks
- Oil containment reservoir
- 110 kV switchyard perimeter fencing
- Internal concrete access roads
110 kV Primary Equipment Installation
Supply, installation and commissioning of new high-voltage primary equipment, including:
- SF₆ circuit breakers
- Disconnectors
- Instrument transformers (current and voltage transformers)
- Surge arresters
110 kV Busbar System
Construction of a new 110 kV busbar system utilizing ACSR-500 conductors, complete with insulator strings and high-voltage fittings.
20 kV Cable Infrastructure
Installation of new 20 kV power cable connections and associated cable systems.
Outdoor Lighting System
Design and installation of a complete outdoor lighting system for the 110 kV switchyard, comprising:
- Operational lighting
- Security lighting
- Emergency lighting
Auxiliary Systems
Installation and commissioning of:
- Grounding and lightning protection system
- CCTV surveillance system
- Intrusion detection and perimeter security system
Relay Protection and Control Systems
Protection engineering activities included configuration, testing and commissioning of:
- 110/20 kV power transformer relay protection
- 110 kV busbar differential protection
Metering Systems
Manufacturing and installation of revenue metering cabinets and associated equipment.
Substation Automation
Integration of the substation into the existing SCADA system, enabling centralized monitoring, control and remote operation.
Testing and Commissioning
Execution of factory and site acceptance activities, functional testing, protection testing, system integration testing and final commissioning of all installed equipment and systems.
Project Delivery
The project was successfully completed and commissioned within a challenging schedule of 180 calendar days, while maintaining uninterrupted compliance with the technical and operational requirements of the transmission network operator.
