A voltage sensor system (1, 1') for sensing voltage in a conductor (40, 40', 40"), the voltage sensor system (1, 1') comprising: a first plate; a first electrode corresponding to and disposed a first distance away from the first plate; a second plate; a second electrode corresponding to and disposed a second distance away from the second plate; and a differential amplifier electrically connected to the first electrode and the second electrode and being configured to output an output voltage that is proportional to a difference in voltage between the first electrode and the second electrode, characterized by the voltage sensor system further comprising: a control unit configured to control one of the first plate and the second plate to be grounded and the other of the first plate and the second plate to be electrically floating; an inverting buffer electrically connected between the control unit and the second plate; wherein the control unit includes an output that is directly electrically coupled to the first plate and is electrically coupled to the second plate via the inverting buffer such that a single signal provided at the output of the control unit causes one of the first plate and the second plate to be grounded and simultaneously causes the other of the first plate and the second plate to be electrically floating, wherein the control unit has a first state in which it controls the first plate to be grounded and the second plate to be electrically floating, and a second state in which it controls the first plate to be floating and the second plate to be grounded, wherein the control unit is configured to switch between the first state and the second state after a predetermined period of time, wherein when voltage in the conductor (40, 40', 40") induces an electric field, the one of the first and second plates (10, 12) that is grounded is configured to shield its associated electrode (14, 16) from the electric field; and wherein the other of the first and second plates (10, 12) that is electrically floating is configured to allow the electric field to pass through it and induce voltage in its associated electrode (14, 16). a first plate; a first electrode corresponding to and disposed a first distance away from the first plate; a second plate; a second electrode corresponding to and disposed a second distance away from the second plate; and a differential amplifier electrically connected to the first electrode and the second electrode and being configured to output an output voltage that is proportional to a difference in voltage between the first electrode and the second electrode, characterized by the voltage sensor system further comprising: a control unit configured to control one of the first plate and the second plate to be grounded and the other of the first plate and the second plate to be electrically floating; an inverting buffer electrically connected between the control unit and the second plate; a control unit configured to control one of the first plate and the second plate to be grounded and the other of the first plate and the second plate to be electrically floating; an inverting buffer electrically connected between the control unit and the second plate; wherein the control unit includes an output that is directly electrically coupled to the first plate and is electrically coupled to the second plate via the inverting buffer such that a single signal provided at the output of the control unit causes one of the first plate and the second plate to be grounded and simultaneously causes the other of the first plate and the second plate to be electrically floating, wherein the control unit has a first state in which it controls the first plate to be grounded and the second plate to be electrically floating, and a second state in which it controls the first plate to be floating and the second plate to be grounded, wherein the control unit is configured to switch between the first state and the second state after a predetermined period of time, wherein when voltage in the conductor (40, 40', 40") induces an electric field, the one of the first and second plates (10, 12) that is grounded is configured to shield its associated electrode (14, 16) from the electric field; and wherein the other of the first and second plates (10, 12) that is electrically floating is configured to allow the electric field to pass through it and induce voltage in its associated electrode (14, 16).