Power distribution network ground fault and insulation resistance identification device

The utility model relates to a power distribution network ground fault and insulation resistance identification device which comprises a first branch, a second branch, a third branch, a fourth branch, a controller and a man-machine interface. The first branch and the second branch are both composed of a capacitor C1, one end of the first branch and one end of the second branch are externally provided with a port M and a port N respectively, and the other ends of the first branch and the second branch are internally connected in parallel; the third branch is formed by connecting an inductance element L1 and a capacitor C2 in series, one end of the inductance element L1 is externally provided with an output port P, and the other end of the capacitor C2 is connected with the parallel connection point of the first branch and the second branch; the filter capacitor C3 of the fourth branch is connected in parallel with the capacitor C2 of the third branch; a current signal acquisition end of the controller is conne