Resistance testing device and method for tapping winding of dry-type transformer

The invention relates to a resistance testing device and method for a tapping winding of a dry-type transformer, which relates to the technical field of electrical measurement. The device comprises a direct current source and a first voltage measuring device, wherein one end of the direct current source is used for being connected with a head end of the first coil winding when the resistance of the first coil winding is detected; the first voltage measuring device is used for being arranged between the head end of the first coil winding and a first calibration tapping node when resistance of the first coil winding is detected; the first calibration tapping node is used for being connected with the head end of a second coil winding; the other end of the direct current source is used for being connected with a second detection tapping node when the resistance of the first coil winding is detected; the number of turns of the coil corresponding to the second detection tapping node is the same as the number of tur