DEVICE FOR MEASURING AN ELECTRICAL QUANTITY OF ONE PHASE OF AN AC ELECTRIC CURRENT OF AN OVERHEAD ELECTRICAL NETWORK

The invention relates to a device for measuring an electrical quantity of one phase of an AC electric current in an overhead electrical network, comprising: a sensor designed to be attached to an electric line of the overhead electrical network, said sensor including: an electrically conductive plate; an electrical conductor, designed to electrically connect the plate to the electric line, in order to circulate a first electric current from the electric line through the electrical conductor; a processing unit, designed to determine the electrical quantity from a value of the first electric current and a value of a capacitance between the plate and the ground. Said device also comprises a generator, electrically connected to the electrical conductor and designed to inject a second electric current through the electrical conductor, said second electric current having a frequency other than the frequency of the first electric current, the processing unit also being designed to calculate the value of the capacitance between the plate and the ground as a function of a value of the second electric current.