Three-post insulator micro-defect partial discharge detection device

The invention relates to a three-post insulator micro-defect partial discharge detection device, which comprises a tank body, and is characterized in that at least two conductive cylinders are arranged in the tank body, each conductive cylinder is supported in the tank body along the same straight line, each conductive cylinder and the tank body are mutually insulated, any two adjacent conductive cylinders are arranged at an interval, and each two adjacent conductive cylinders are arranged at intervals, each conductive cylinder is provided with a measuring port, each conductive cylinder is provided with a connecting structure used for being fixedly connected with an insert on an insulating pillar of the three-pillar insulator, and the three-pillar insulator micro-defect partial discharge detection device further comprises shielding units corresponding to the three-pillar insulators, each shielding unit comprises shielding cylinders which are correspondingly buckled at the two ends of a conductive tube of the