Tram outdoor mobile energy storage power supply

How did modern tramways develop a new energy storage system?

In terms of modern tramways, early alternative solutions involved either onboard traction batteries (typically in the form of Nickel-Metal Hydride cells), or onboard supercapacitors. These technologies established a new form of technology, generally termed ‘Onboard Energy Storage Systems’, or OESS.

How is a tram powered?

Trams are typically powered by an overhead contact line with a 750 or 600 V DC power supply wire at 4 to 6 m above the rail level. The electric current returns through the rails, and all metallic parts of the vehicles must be earthed to ensure safety against accidental electrocution.

What power source do trams typically use?

Trams generally use an overhead contact line with a 750 or 600 V DC power supply wire at 4 to 6 m above the rail level. The electric current returns through the rails.

How does the TramWave system work?

The TramWave system operates by raising its contact shoe with a magnet when the vehicle does not require power from the contact rail. This occurs in all situations where the vehicle is coasting, powered through its pantograph, or through an on-board storage or power generation equipment. Fig. 9: Longitudinal section illustrating the principle of operation of the TramWave system.

How a battery exchange system can be used in a tram?

A system of battery exchange by robots has been developed in China for use in trams. Frequent recharge operations are carried out at stations or at the end of the line, using either physical or inductive contact to the power supply at some stations. A 30 m long tram may need two Li-ion batteries of about 50 kWh with a mass of about 800 kg each.

How does the electric current return in tram systems?

The electric current returns through the rails and all metallic parts of the vehicles must be earthed, to ensure safety against accidental electrocution. Trams generally use an overhead contact line with a 750 or 600 V DC power supply wire at 4 to 6 m above the rail level.