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Old June 11th, 2016, 06:01 PM   #81
0tomek0
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Quote:
Originally Posted by Kpc21 View Post
I think there difference is rather between countries. Germany uses 750 V, Poland 600 V. Other countries may use also other voltages, there can be even differences between different cities.

There is not a big difference between the 600 V and 750 V voltage. Actually we have a few trams in Łódź which were imported from Germany, designed for the 750 V voltage, and they work in Łódź where the power supply voltage is 600 V - after changing the polarity, which was needed because we have + at the rails and - at the catenary (so if we take the rails - which are grounded - as a reference point, then the voltage at the catenary is -600 V) and the most popular system is with + at the catenary.

So the difference in the catenary radius should also not be big.
German tram systems use 600V as well. Augsburg, Nuremberg, Frankfurt/Main, Berlin, Bremen and Potsdam are the examples.

A tram consuming 400kW will be taking current of 670A in case of 600V supply. In case of 750 it drops to 530 only. The problem of switching vehicles from one system to another should not be a big issue.
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Old June 26th, 2017, 06:33 AM   #82
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Tramway of Rio de Janeiro (VLT)



Rio de Janeiro Light Rail (Portuguese: VLT do Rio de Janeiro) is a modern light rail system serving Rio de Janeiro, Brazil. The system is among several new public transport developments in the region ahead of the city's successful bid for the 2016 Summer Olympics. Its official name is VLT Carioca, the initialism "VLT" (which stands for Veículo leve sobre trilhos, literally Light vehicle over rails) being equivalent to the English term light rail. The first phase, consisting of a single 15-kilometre line between the Novo Rio Bus Terminal and Santos Dumont Airport and 18 stops, was inaugurated on 5 June 2016, two months ahead of the Olympics opening ceremony, with regular service beginning the following day. For the first month of operation, it was free of charge to ride, but only two trams were in service between noon and 15:00 on the section between Parada dos Museus in Praça Mauá and Santos Dumont Airport. The remainder of the line was opened and service was expanded to full-time operation on 12 July, although only 16 of the 18 stops on the line are in use. The network uses 32 Alstom Citadis 402 low-floor trams carrying 420 passengers each. They are bi-directional, air-conditioned, have seven sections, and eight doors per side. The first five trams were built in Alstom's facility in La Rochelle, France, and the remaining 27 were built in Alstom's facility in Taubaté, in the state of São Paulo. The trams are the first to use a combination of ground-level power supply (APS) and on-board supercapacitor energy storage (SRS) to eliminate overhead lines along the entire route. The remainder of the three-line, 28-km network will open in stages by the end of 2017. It is estimated that when the entire network is at full capacity, it would be able to eliminate 60% of buses and 15% of automobile traffic circulating in the city centre.



















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Old June 26th, 2017, 06:33 AM   #83
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Old June 26th, 2017, 09:10 AM   #84
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Another wire-free tram that is being used in China is a hydrogen powered tram which has zero pollution and very quiet.
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Old June 27th, 2017, 12:46 PM   #85
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New tram line in Kaohsiung, Taiwan uses CAF Urbos cars with supercapacitors installed.
They can charge on stops/
https://en.wikipedia.org/wiki/Circul...(Kaohsiung_MRT)
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