Patent ID: 9645190
Date: 2017-05-09
CPC Classifications: G01R

Claim:
1. A partial discharge sensor comprising: a first ground that includes a high-voltage wire, and constitutes a closed space in a manner to surround the high-voltage wire; a cylindrical branch pipe that is provided at a part of the first ground to protrude to an outer space; a first opening at an end of the branch pipe on a side to the closed space; a lid at an end of the branch pipe on a side opposite to the first opening; a first metal container disposed in a recess space constituted by the branch pipe and the lid and having at least one hole through which gas can pass; a slit that is provided in a surface of the first metal container on a side of the first opening; a desiccant that is provided in the first metal container; an interval retainer that retains an interval between the slit and the desiccant, such that the desiccant does not contact the slit; and a coaxial wire disposed inside the first metal container, wherein at one end of the coaxial wire, an outer conductor of the coaxial wire is connected to the first metal container at a portion near the center of the slit, and an inner conductor of the coaxial wire is connected to the first metal container on the opposite side across the slit with respect to a position where the outer conductor is connected, whereby the outer conductor and the inner conductor are operated as a slot antenna to detect a high frequency wave due to a partial discharge occurring in the closed space.