Patent ID: 9159488
Filing Date: 2015-10-13
Classification: H01F

Abstract:
1. A vacuum capacitor instrument voltage transformer comprising: a vacuum vessel comprising a grounded insulating tube and electrically conductive end plates that close open ends of the insulating tube in a manner to provide a vacuum condition in the insulating tube; and a system that is installed in the vacuum vessel and comprises: a primary line-path side main capacitor portion; a ground side voltage dividing capacitor portion; a transforming device that measures a current provided by a ratio in capacitance between the main capacitor portion and the voltage dividing capacitor portion and outputs a corresponding voltage; a main ground circuit through which a leak current flows from an outer surface of the primary line-path side vacuum vessel to ground; and a voltage dividing ground circuit through which a leak current flows to ground through a voltage dividing insulating cylindrical member that is disposed between a grounded portion and each of the main capacitor portion and the voltage dividing capacitor portion.