OPTICAL VOLTAGE MEASURING APPARATUS FOR GAS INSULATED ELECTRIC MACHINE

摘要

PURPOSE: To obtain an optical voltage measuring apparatus for gas insulated electric machine in which the voltage can be measured with high accuracy while facilitating the maintenance. CONSTITUTION: The optical voltage measuring apparatus comprises a ground electrode 20 fixed to an enclosure 10 while being spaced apart by a predetermined interval from a bus 11 contained therein with a hole 21 being made at a part facing the bus 11, an intermediate electrode 30 disposed oppositely to the back side of the ground electrode 20 with respect to the bus 11 while being spaced apart by a predetermined interval therefrom, an optical voltage sensor 40 connected with the intermediate electrode 30 and the ground electrode 20, and a signal processor 50 disposed on the outside of the enclosure 10 while being coupled optically with the optical voltage sensor 40. The optical voltage sensor 40 is interposed between the ground electrode 20 and the intermediate electrode 30 with the electrode 46 of an electrooptic crystal 44 constituting the optical voltage sensor 40 being abutted directly against the ground electrode 20 and the intermediate electrode 30 and connected therewith.