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Energy Optimisation
for Public Transportation

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Energy Optimisation for Public Transportation

Railway, tram and subway systems have a very large quantity of unused energy available, which is “burned off” via rheostatic and mechanical brakes on the vehicles and thus remains unused. Stationary, modular flywheel storage of the net powersafe company stores the electrical energy generated during braking and makes it available later for accelerations. The high level of efficiency, the non-contact magnetic bearings with a floating rotor and minimum maintenance guarantee the transport operator maximum cost savings.

The Vycon® modular flywheel storage is the core component of the system. The operating software and visualisation are special developments of net powersafe and are brought to bear as standard features in applications for energy optimisation. This can truthfully be referred to as a “pioneering” engineering achievement.

In the past few years, net powersafe has installed or purchased more than 20 MVA of flywheel installations in Switzerland. This excellent record makes our company the market leader in this technology field. Reliable, efficient and ecologically significant energy supply is the focus of our activities.

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Model: RR125

Output: 125 kW rated

Energy content: 1875 kWs (0.52 kWh max.)

Flywheel speed: 10000 rpm to 20000 rpm

Rated DC voltage: Input/output 750 VDC / 1500 VDC

DC current: 167 ADC @ 750 VDC

Recharging time: 15 sec.

Auxiliary power supply: 120/200/208/240/480 VAC, single-phase, 50/60 Hz 5500 VA max.

Ambient Conditions

Housing: IP2X

Ambient temperature, operation: 0 °C to +50 °C

Minimum temperature during cold start: 0° C

Ambient temperature, storage: -20 °C to +70 °C

Humidity: 0% to 95%, not condensing

Installation altitude: up to 1525 m without a reduction in power

Power loss, system: < 5% of rated power

Mechanical specifications:

Weight: 998 kg, including packaging material

Dimensions (W x D x H): 76 cm x 76 cm x 187 cm

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In the era of sustainable energy, energy storage plays a central role in the efficient use of renewable resources. Energy storage technologies enable the storage of excess energy and its provision when demand exceeds current supply, which is particularly important when using solar and wind power.

These technologies not only transform the way we consume energy but also significantly support the energy transition. Batteries, for example, are among the most widely used forms of energy storage. Lithium-ion batteries are especially popular due to their high energy density and efficiency, making them an ideal solution for both private and commercial use.

Moreover, pumped-storage power plants offer a time-tested method for large-scale energy storage. They use surplus energy to pump water to higher elevations, which is then released when needed to drive turbines and generate electricity. This method provides an effective means of grid stabilization and the integration of renewable energy.

Energy storage systems contribute not only to grid stability but also offer economic advantages. The ability to store energy when prices are low and use it when prices are high can significantly reduce costs. Consumers benefit from a reduced dependence on grid electricity and can also contribute to lowering CO₂ emissions.

Innovation in this field is progressing rapidly. From the development of new materials to advanced technologies, energy storage promises to become even more efficient and cost-effective. With the increasing integration of intelligent control systems, energy storage solutions will soon not only be able to store power but also anticipate demand and optimize energy distribution.

In a world that is increasingly dependent on renewable energy, energy storage solutions provide the flexibility and reliability needed for a sustainable energy future. As an integral part of the global energy infrastructure, they will continue to play a crucial role in promoting environmental sustainability and energy independence.