Transformer and Switch (TSW):
1. Railway Authorities will decide which voltage level is acceptable from the Transformer and Switch (TSW) to the Power Rail (PR).
2. Well established, reliable and therefore cheaper inter-connection components will affect decisions.
3. Somewhere between 12000vac and 6000vac is a good assumption to make when planning in advance.
4. The reference used here is that the break down voltage of air is 33000volts/cm.
5. A transformer is connected to the output of the (SHE) in order to raise it's output voltage to power transmission line levels.
6. Once the transmission level voltage is available, it may not be necessary to have a transformer in each (TSW) box along the track, because the equipment onboard the trains would then take care of accepting the available voltage level.
7. Where required, inter-state high level planning and agreement from day one will save money on the construction and running costs in certain areas later.
8. A very low voltage will be collected from the output of the transformer and sent back to the (SHE), where it is connected to the Power Supply and used to synchronize the frequency of the Turbine and Generator combination to that on the cable.
9. That is done by adjusting the opening of the valve Dir-V1.
10. Each (SHE) will send a unique code at a unique frequency to the switch and along the Power Cable (PR), so that it will be known what is connected to the cable and what their status is.