Innovative Sierra AC + DC UPS System: Redundancy and Easy Maintenance for Modern Railways

In the world of railway technology, ensuring a continuous power supply to critical systems is paramount. This year at InnoTrans Hall 22 Stand 276, CE+T Power and Gertek will present the Sierra AC + DC Uninterruptible Power Supply (UPS) system. Perfectly matching the demanding needs of the railway industry, the Sierra system offers unparalleled redundancy, easy maintenance, and robust performance. 

Overview of Sierra AC + DC UPS System 

The Sierra system is a cutting-edge solution engineered to provide reliable power in both AC and DC with one module. This dual functionality is crucial for modern railway operations, which often require both types of power for different systems. The Sierra system’s core strengths lie in its high redundancy, modular design, and ease of maintenance, making it an indispensable asset for railway operators aiming to enhance their infrastructure’s reliability and efficiency. 

Key features are: 

• Bi-directional ports
• High redundancy
• Ease of maintenance 

AC + DC Functionality

A standout feature of the Sierra system is its innovative conversion technology. The system is equipped with three bi-directional ports: two AC ports and one DC port. This unique design allows for seamless energy conversion between these ports using a single, compact module. The bi-directional capability means that energy can flow in either direction through each port, providing unparalleled flexibility in power management, handling both AC and DC loads.  

Its future-proof design allows for easy integration of a mix of AC and DC loads, adapting to evolving requirements without necessitating major infrastructure overhauls. This adaptability ensures that railway operators can integrate new technologies seamlessly, maintaining efficiency and operational continuity. 

By combining converters and inverters into a single module, this all-in-one platform offers several key advantages minimizing the need for extensive human resources and making staff training easier and more efficient, but also simplifies logistics.   

Redundancy for Uninterrupted Operation

Uninterrupted operation is critical in railway systems, where downtime can lead to significant disruptions. The Sierra system incorporates multiple layers of redundancy to mitigate power interruptions effectively: 

• Dual power inputs: the system can receive power from two independent sources, ensuring that if one source fails, the other can take over without interruption. 
• Intelligent monitoring and management: the Sierra system is equipped with advanced monitoring and management software that continuously checks the health of the system remotely. 
• Hot-swappable modules: Maintenance and replacements can be performed without shutting down the system. If one module fails, others continue to run, ensuring continuous operation.

Easy Maintenance

Maintenance is a crucial aspect of any railway power system, and the Sierra system is designed to make this process straightforward and efficient. Key features that facilitate easy maintenance include: 

• Modular design: the system’s modular architecture allows individual components to be easily accessed and replaced (thanks to hot-swappability), reducing the time required for maintenance and minimizing the risk of errors. 
• User-friendly Monitoring: the system provides real-time information on system status, performance metrics, and maintenance needs. This interface simplifies troubleshooting and ensures that maintenance teams can quickly identify and address any issues. 
• Simplified training: as an all-in-one platform, the Sierra system reduces the complexity of training staff. Maintenance personnel only need to be familiar with a single system rather than multiple components, lowering training costs and ensuring that staff retain their knowledge and skills more effectively. 

Technical Specifications 

The Sierra system boasts impressive technical specifications that cater to the high demands of railway applications: 

• Input and Output Voltage: 230, 240 & 277 Vac, 48 Vdc 
• Power Capacity: The total output power per module is 2.7 kW, limited to 2.4 kW for each AC or DC port, scalable with additional modules up to 1,2 MW 
• Efficiency: Up to 96% energy efficiency 
• Operating Temperature Range: -20°C to +65°C, suitable for various environmental conditions 

All detailed information can be found here. Note that we also have a solution for smaller load needs, discover more about our Sierra 10 here. 

Proven Performance: Projects and References 

The Sierra system has been successfully deployed in projects across Germany, demonstrating its reliability and effectiveness. It has been adopted by major railway operators worldwide, benefiting from CE+T’s extensive experience since its founding in 1934.  

These real-world applications underline the system’s robustness and versatility: 

• Signaling systems: the Sierra system ensures continuous power to signaling systems, maintaining safe and efficient train operations. This reliability is crucial for preventing signal failures that could lead to delays or accidents.
• IT network security: the Sierra system provides reliable power for inter-site communication networks, enhancing IT infrastructure security. This capability is vital for maintaining continuous and secure communication between different railway sites. 
• Telecommunication networks: The Sierra supports the renewal of GSM-R networks and the transition to the Future Railway Mobile Communication System (FRMCS-5G). This future-proofing ensures that railway communication systems remain up-to-date with technological advancements. 
• Control systems: supporting the power needs of control systems that manage train movements, track switching, and other critical functions. 

Beyond Backup: Fuel Cells and Solar Integration 

The Sierra system not only excels in providing backup power but also opens up discussions on energy management and storage. By integrating with fuel cells and solar energy systems, the Sierra system supports a transition from mere backup to comprehensive energy management solutions. This capability positions the Sierra system as a future-proof platform capable of meeting evolving energy needs. The integration with renewable energy sources ensures sustainable and efficient power management, aligning with future trends in the railway industry. 

Discover our Railway Power Solution at InnoTrans 

The Sierra system represents a significant advancement in railway power supply technology. Its combination of dual AC and DC functionality, high redundancy, and easy maintenance make it an ideal choice for railway engineers looking to enhance the reliability and efficiency of their systems. We invite you to visit our booth at InnoTrans, Hall 22 Stand 276, to learn more about the Sierra system and see firsthand how it can benefit your railway operations. 

About CE+T Power 

Founded in 1934, CE+T Power is a global leader in power electronics, based in Belgium with projects worldwide, specializing in the design and manufacturing of innovative solutions for energy conversion. With a commitment to quality and innovation, CE+T provides reliable and efficient power systems for a wide range of applications, including critical infrastructure in the railway industry. Visit the website ! 

About Gertek 

Based in Germany, Gertek is a renowned provider of advanced technology solutions for the railway and telecommunications sectors. Known for its expertise in integrating cutting-edge power systems and communication networks, Gertek delivers robust, reliable, and future-proof solutions that meet the evolving needs of modern railway operators. Visit the website!