Partial discharge signal detection system of high-voltage switch cabinet

The invention discloses a partial discharge signal detection system of a high-voltage switch cabinet. The partial discharge signal detection system comprises a composite partial discharge sensor, a first metal electrode, a second metal electrode, a first insulating sheet, a second insulating sheet and a miniature high-frequency current transformer; the first insulating sheet and the second insulating sheet are oppositely arranged on the inner wall and the outer wall of the switch cabinet shell; the first metal electrode and the second metal electrode are fixedly mounted on the first insulating sheet and the second insulating sheet respectively; the composite partial discharge sensor is fixedly and electrically connected with the first metal electrode and is used for detecting a partial discharge signal; the miniature high-frequency current transformer is electrically connected with the second metal electrode; and the miniature high-frequency current transformer and the switch cabinet shell are grounded. The t