Stringent New Tunnel Standards
The A2 tunnel project was carried out by the Avenue2 Consortium, consisting of construction engineering company Ballast Nedam and contractor Struckton, following a comprehensive planning period. Collectively there was a regular staff of more than 50, with over 500 contractors working on the project day to day.
The unique and complex design of the tunnel resulted in the Dutch Ministry of Infrastructure and the Environment introducing a new National Tunnel Standard (the Landelijke Tunnel Standard “LTS”) to ensure the highest standards of safety and security were adhered to. As a result, more than 50 different traffic and tunnel management technical installations were implemented in accordance with the new “LTS” standard. Each ensuring smooth traffic flow, preventing and detecting incidents, as well as ensuring measures were in place for timely responses to emergencies. However operating these 50+ subsystems including energy supply, lighting, ventilation, emergency stations, CCTV surveillance, fire alarm systems and more – presented a number of complexities.
An Integrated Tunnel Control System
AVEVA was selected as the end-to-end solution partner to manage the efficient monitoring and control of the various tunnel and traffic-related subsystems throughout the system. With the responsibility for the entire tunnel automation and energy distribution systems, Citect SCADA was at the core of the control system with redundant Citect SCADA servers integrated with hot standby Quantum PLCs. With the complexities of the “LTS” tunnel standard and requirements to consistently translate the standards into the PLC control system, a comprehensive software guideline was written with a dedicated library built for the equipment layer. The equipment layer was then generated from the central design database with the functional specification translated directly into the software.
The system architecture comprised:
- Citect SCADA redundant servers
- Modicon Quantum PLCs (7 redundant PLCs with hot standby and 3 single PLCs)
- Modicon STB I/O (300 STBNIC2212 | 10,000 I/O)
- Unity Application Generator (UAG) and EcoStruxure Control Expert (formerly Unity Pro)
- M580 PLCs and Magelis HMI
- Ethernet IP and Modbus TCP
- MV transformers and switchgear
- LV iPCC, LV distribution and Altivar drives
- UPS • Sensors (>1000)
Central Command Rooms
The Brains of the Tunnel The A2 tunnel has 2 main command rooms, one in a service building in the south and one to the north. Both are known as the ‘brains of the tunnel’ given their role in managing the data convergence for the entire tunnel system and the monitoring and controlling of more than 50 tunnel and traffic-related systems.
The tunnel’s Citect-based SCADA control system ensures that the vast volume of information that is being monitored, is seamlessly displayed to operators in a user-friendly graphical interface on workstations in both control rooms. Operators can view the system status in real-time, taking swift corrective action as needed on any of the tunnel and traffic-related technical subsystems being remotely controlled.
The combination of Citect SCADA and Quantum PLCs were selected due to their high level availability and reliability, with the PLCs configured using EcoStruxure Control Expert software (formerly Unity Pro). With system failures out of the question in such a critical application, the solution’s robustness and adherence to the stringent standards was instrumental in it’s success in being selected for the project.
Collaboration – Key to Project’s Success
The close collaboration and transparency between all parties involved in the A2 project, was also vital to it’s success. From the outset and throughout the comprehensive planning period all parties were aligned on the objectives and committed to the delivery of the tunnel within the set timeframe and allocated budget.
AVEVA’s willingness to go beyond being just a solution partner to actively collaborating within the project team, ensured the project was delivered successfully and on time.