Patent ID: 7129693

Claim:
A device to measure the voltage difference between two conductors, comprised of a high voltage arm consisting of more than one identical modular sections connected in series; where the electrical connections between modular sections are electrically insulated from the external environment; where each modular section is constructed from a plurality of series-connected identical electrical impedance elements distributed in one or more high voltage impedance strings; where each impedance string has the form of a spiral that is intertwined with one or more additional impedance strings such that each spiral-formed impedance string provides dielectric shielding for the other spiral-formed impedance strings; where each impedance element is comprised of a resistor in series with a capacitor; where one or more low voltage arms are comprised of strings of one or more impedance elements; where one or more low voltage arms are electrically connected in series with one end or both ends of the high voltage arm, across which a voltage is measured relative to the first or second conductors connected across the device terminals; and where one or more electronic circuits amplify the signals across one or more of the low voltage arm impedance elements and provide corrections for one or more of the ratios between the measured voltage difference and one or more of the output signals.