Minnesota's first commuter rail line, which began operation in November 2009, is expected to carry up to 3,400 passengers a day during the first year of operation, helping to reduce traffic congestion as well as commuter travel time. At a cost of $320 million, Northstar Rail includes six new train stations and an 80,000-square-foot vehicle maintenance facility where diesel-electric engines and passenger cars are serviced and even washed. Because safe and reliable service is paramount to the new commuter rail line, engineers/consultants specified a 1,000 kW MTU Onsite Energy emergency standby generator set for the maintenance facility to ensure that, even if a utility outage occurs, trains will be ready and in service when needed.
This MTU Onsite Energy power system is designed for robust applications that need dependable electrical power.
Northstar Rail trains are powered by diesel-electric locomotives and therefore run independently of utility power. All five locomotives and the 18 passenger cars are serviced at the vehicle maintenance facility at the Big Lake Station, the northwest terminus of the line, and it is here that reliable electric power is needed to keep trains running on time.
"The MTU Onsite Energy generator supports all of the vehicle maintenance facility's electrical loads, so regardless of utility power outages or weather-related power outages, the facility is operational and the trains still run," said Tim Stalpes, sales engineer for Interstate Power Systems, the local distributor for MTU Onsite Energy.
The vehicle maintenance facility is 38 feet high and more than 600 feet long and includes four different types of rail track: a component removal track, designed for repairs on two cars at once; a larger repair-and-maintenance track; a storage-and-inspection track; and a train-wash track, located in a separate building. The building's electric loads include HVAC, lighting and electrical service to the administrative offices, but the majority of the load is for large-scale industrial equipment for the ongoing maintenance and repairs performed on the cars and engines. This includes truck hoists and a wayside power cabinet for the component removal track. Wayside power provides heating, lights and ventilation to trains when they are not powered by the diesel-electric locomotive. The train wash alone is 20 percent of the load.
The 1,000 kW MTU Onsite Energy power system includes an MTU 16V2000 engine with 1,495 brake horsepower, a 480-volt alternator and transfer switch. The Series 2000 engine features an advanced diesel engine controller, or ADEC, that optimizes combustion and allows the engine to meet current exhaust emissions requirements.
"In the event of a utility power outage, the generator will assume the load within 10 seconds of power loss," said Clarence Cronin of Design Electric, St. Cloud, Minn., the project's electrical contractor. Because it's likely the facility will expand in the future, or the electrical loads will increase, the power system is sized for approximately 20 percent growth.