Patent ID: 8982526
Filing Date: 2015-03-17
Classification: H01C

Abstract:
1. A polymer surge arrester, comprising: a nonlinear resistor; metal plates placed on an upper end face and a lower end face of the nonlinear resistor; electrodes placed on the upper end face and the lower end face of the nonlinear resistor via the metal plates; a plurality of insulating rods placed at peripheries of the nonlinear resistor and the metal plates, and each having an upper end portion and a lower end portion inserted into holes formed in the electrodes; a spacer inserted between an inner peripheral surface of the hole of the electrode and an outer peripheral surface of the insulating rod; a fixing screw attached to the hole of the electrode; and a double-ended bolt coupling the metal plate and the electrode together, the double-ended bolt having a left screw part and a right screw part opposite in a fastening direction to the left screw part which are provided on a same axis, the left screw part being attached to the metal plate the right screw part being attached to the electrode, wherein, by rotating the right screw part in the clockwise direction, a compressive load is applied on the nonlinear resistor in the axial direction of the double-ended bolt and a tensile load is applied on the insulating rods in the axial direction.