Case Study · Railway
DC/AC inverters for emergency HVAC systems – Supplying fresh air to passengers in critical situations
Power supply for rolling stock can be critical, especially in emergency related applications such as HVAC (heat ventilation and air conditioning) systems, where a ventilation circuit is needed for safety and passenger comfort reasons when a train loses its main power source (catenary or diesel motor) in the middle of the route.
The challenge in power conversion systems for railway applications is the performance, as failures cannot be tolerated under extreme mechanical stress when temperatures can reach large ranges.
Choosing the right DC/AC inverter is key for a correct functioning of the auxiliary emergency system, as it gets fed by 24V, 36V, 72V or 110V batteries and converts the input into 3 phase AC power (150 .. 400Vac). This way, the inverter feeds a 3ph motor that turns on the fans to keep the ventilation in the train running.
Powering The Challenge
At Premium, we have supplied 3ph DC/AC inverters for this kind of applications for years. We do not only offer expertise in this field, but also reliable and robust solutions, which become the perfect match in harsh environmental conditions (extreme temperature and humidity, and high levels of shock and vibrations) while offering a very compact size to fit in small spaces.
All Premium DC/AC inverters comply with the EN50155 standard, which guarantees performance for electronic equipment used in rolling stock. This standard lays down minimum requirements for:
- Input voltage range
- Electrical isolation
- Operating temperature
- Shock and vibration
- Expected useful life
Our solutions can be found in trains all around the world:
- CAF´s Civity fleet for the UK, where our ODX-1300 DC/AC inverters are used in emergency fans
- Bombardier´s streetcars in Cologne, where our ODX-3000 and ODX-6000 are currently being used for HVAC emergency systems
- Metro Chile also includes our ODX-1300 inverter series for HVAC purposes