Description on Electrical Railway Network in Great Britain Sample Clauses

Description on Electrical Railway Network in Great Britain. In UK, Network rail is the infrastructure manager of the national rail network. Actually, they are in charge of track, signalling, bridges, tunnels and stations. A majority of the electrified track kilometres use AC overhead line in either 1x25 kV (Rail Return or Booster Transformer) or 2x25kV (Autotransformer-based) systems. The AC network operates typically from the public power supply, transformed from a source voltage of either 132kV (for 1x25kV) or 400kV (for 2x25kV). There are a few exceptions which vary between 66kV and 275kV. The DC network is also fed from the public power supply, and is distributed along the line to substations at either: 11kV, 22kV, 33kV or 66kV. The Tyne and Wear Metro has a shared section with Network Rail which is electrified with 1500 V DC overhead line which will be discussed in details in this report for better understanding of Metro electrical networks. The public electricity supply industry is split into the transmission network (operating at between 275kV and 400kV) and the distribution network (operating at between 132kV and 400V). Both of these networks are owned and managed by private companies, and are of fixed geographical nature. In figure 4.2, topology of electrical power supply of a typical 3rd rail 750 V DC is depicted. Although 750 V DC is normally considered to be a low voltage level to be used for railways, some railway lines are electrified by using this value both in UK and in Europe. The 750V direct current (DC) third-rail network is limited in the amount of power it can provide efficiently for train services. Figure 4.2- Typical rail 750 V DC Traction System configuration
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