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| Research on the Protection Configuration of Traction Substation in Bilateral Interconnected Power Supply Mode |
| WANG Jilai |
| (China Railway First Survey and Design Institute Group Co. Ltd, Xi′an, Shaanxi 710043, China |
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Abstract Research purposes: In order to solve the problems of train deceleration, power loss, overvoltage and power supply reliability caused by the phase splits of electrified railways, especially mountainous electrified railways, a bilateral interconnected power supply system was proposed, so that two adjacent traction substations can be connected to each other. Through connection between the groups, the in-phase power supply of the catenary within the group range was realized, which provided conditions for canceling the phase splits. However, there were significant differences between the protection configuration scheme of traction substations under the bilateral interconnected power supply mode and the unilateral power supply mode, which had an important impact on the main wiring form and operation mode of the traction substation and the reliability of the traction power supply system. In this paper, relied on the bilateral interconnected power supply test project, by 110 kV traction substation as an example, from the structural characteristics of the bilateral interconnected power supply system, the protection configuration scheme of the traction substation was studied.
Research conclusions: (1) In the bilateral interconnected power supply mode, the longitudinal protection was used on the feeder of the traction substation. (2) In the bilateral interconnected power supply mode, an independent 27.5 kV bus differential protection was used in the traction substation. (3) In the bilateral interconnected power supply mode, the incoming line of the traction substation should be combined with the local substation to set up the incoming line optical fiber differential protection. (4) The research conclusions can provide a theoretical basis for the engineering application of bilateral interconnected power supply technology.
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Received: 08 December 2021
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2022, Vol. 39 
