Question
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The English channel tunnel rail link is supplied at 25 kv rms from the United Kingdom and French grid systems. when there is a grid supply failure, each end is capable of supplying the whole tunnel but in a reduced operational mode. The tunnel traction system is a conventional catenary (overhead write) system similar to the surface main line electric railway system of the United Kingdom and france. What makes the tunnel traction system different and unique is the high density of traction load and the end-fed supply arrangement. The tunnel traction load is considerable. For which half tunnel, the load is 180MVA.(Barnes and wong, 1991). Assume that each line-to-line voltage of the Y-connected source is 25 kV rms and the three-phase system is connected to the traction motor of an electric locomotive. The motor is a Y-connected load with Z=168/21 degree ohm. Find the (a) magnitude of the line currents and power (b) delivered to the traction motor.
Explanation / Answer
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