On-load phase-changing and wire-changing device for single-channel transformer direct-current resistance tester

The utility model relates to an on-load phase-changing and wire-changing device for a single-channel transformer direct-current resistance tester, which relates to an auxiliary expansion device for asingle-channel direct-current resistance tester of a power transmission and distribution transformer in the power industry, and is structurally characterized in that eight lead terminals are connectedwith test leads to form a test signal input end of the device, and four test terminals are connected with the direct-current resistance tester; for the test signal output end of the device, the transition resistance control switches respectively control the on-off states of the corresponding transition resistance loops, and the resistance test line selection switches respectively control the on-off states of the corresponding loops. The beneficial effects of the single-channel DC resistance tester are that the single-channel DC resistance tester can effectively reduce the charging and discharging times and time caused