Engineering Application of Partition of Medium Voltage Power Supply Network in Urban Rail Transit

The medium voltage network of urban rail transit is an important link between main substation, traction power supply system and power and lighting power supply system. It also restricts the determination of the location and quantity of main substation. The division of ring network partition of operation and construction line has experienced the process of "short section", "long section" and "short section". The principles of several protection modes in different zones are expounded, and the protection reliability and power supply system maintenance are analyzed. At the same time, taking actual engineering application as example, the zoning forms of medium voltage ring network are compared, and division of partition is analyzed from aspects including tide current meter, protection method choice and cable investment, providing reference for design.