Direct current power supply system of non-floating charge type transformer substation based on lithium iron battery

The utility model discloses a direct current power supply system of a non-floating charge type transformer substation based on a lithium iron battery. The positive output end and the negative output end of high-frequency switch charging modules are respectively connected with a positive pole of a direct current busbar and a negative pole of the direct current busbar, the positive and the negative poles of a lithium iron battery pack are connected with the positive and the negative poles of the direct current busbar through a fourth air switch K4, a plurality of output branch circuits are connected on the positive and the negative poles of the direct current busbar, a plurality of the high-frequency switch charging modules are connected in parallel, and each high-frequency switch charging module is connected with a model BMJ-FPC monitor; an insulation monitoring device is connected with the monitor; and the output end of a current transformer CT mounted on each output branch circuit is connected with the insulation monitoring device. The system can realize hot standby and automatic supplementation of electricity of the lithium ion battery pack under a non-online floating charge way, and has the characteristics of prolonging the service life of power supply equipment, improving safety and increasing the degree of automation.