Dry-type plug-in bushing, manufacturing method of the same, and high-voltage installation comprising same

A method for manufacturing a plug-in bushing, comprising:

• a cast molding process of molding a resin insulating body in a form surrounding an outer circumference of a long cylindrical conducting body and exposing both ends of the conducting body by injecting a resin into a predetermined mold in a casting method;
• a control electrode and support fitting connection process of coupling an electric field control electrode and a lower support fitting and then inserting the electric field control electrode and a lower support fitting from above the resin insulating body to be connected thereto in a state fixed at a designed position;
• a support molding material forming process of forming a molding groove in a circumferential direction in which the lower support fitting contacts the resin insulating body and inserting a liquid state resin through a molding material injection part defined in the lower support fitting to fill and cure the inside of the molding groove;
• after the support molding material forming process, an insert injection process of insert-injecting an injected insulating body by injecting an insulating material made of a silicon material into a predetermined mold in a state of the control electrode and support fitting connection process;
• and
• a stress cone connection process of allowing a pre-injection-molded stress cone to pass from a lower portion of the conducting body and be tightly coupled and connected to a lower portion of the resin insulating body.