Feeding Circuit Configuration

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A general configuration of an AC feeding circuit is shown in below figure.

Each railway wayside is provided with Traction Substations (SS), Sectioning Posts (SP) for sectioning of feeding network, Sub-Sectioning Posts (SSP) for limited sectioning of feeding network, and Auto Transformer Post (ATP) which has only auto transformer.

The Traction Substation interval in the case of a conventional line is 30 to 50 km for the BT Feeding System and 90 to 110 km for the AT Feeding System, and in the case of a Shinkansen, 20 to 60 km for the AT Feeding System.
And the auto transformer interval is about 10 km for Shinkansen AT Feeding System, so not only SS but also SP, SSP and ATP have the auto transformers.

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