Direct-current ground loss positioning method based on source-load conversion technology

The invention provides a direct current ground loss positioning method based on a source-load conversion technology. The method comprises the following steps: S1, delimiting a circuit breaking method operation range in which a circuit breaking method needs to be used for positioning an ungrounded feeder line; S2, arranging a small source-load conversion power supply at an air switch of each branch feeder line within the operation range of the switching-off method, wherein when the source conversion power supply is inserted into the input end of the air switch, the load is a branch load in a charging state, and when the source-mint conversion power supply is inserted into the output end of the air switch, the branch back-up power supply is used for monitoring the voltage of the output end; S3, determining that the output end of the power supply air switch of each branch feeder is inserted with a source-load conversion power supply, then positioning the ground-uninsulation feeder of the direct current system by