Patent ID: 7397233
Filing Date: 2008-07-08
Classification: G01R

Abstract:
1. A device for measuring alternating voltage in a conductor under test, the device comprising first and second sets of capacitive voltage sensors mounted on an electrically insulating support member, the first set of sensors being positioned along a first notional closed path and being connected in parallel between a first signal conductor and a reference conductor, the second set of sensors being positioned along a second notional closed path surrounding the first closed path and being connected in parallel between a second signal conductor and the same reference conductor as the first set, the support member being configured to allow a conductor under test to be introduced into the interior of the device so that the sensors surround the axis of the conductor under test, and each sensor having a signal electrode connected to the respective signal conductor and a reference electrode connected to the reference conductor, the sensors of the first set being orientated with the signal electrode facing the conductor under test, and the sensors of the second set being orientated with the signal electrode facing away from the conductor under test, and the device further including means for deriving the voltage in the conductor under test as a function of the voltage across the first signal conductor and the reference conductor and the voltage across the second signal conductor and the reference conductor.