Portable self powered line mounted device and method for measuring the voltage of electric power line conductors

A device for measuring the voltage of an electric power line conductor for a power system comprising:

• a first electrically conductive housing configured to be installed on a first power line conductor;
• a first virtual grounding member configured to electrically ground the first housing to a first power line conductor voltage;
• a first measuring resistor electrically connected between the first virtual ground member and an electrically isolated lead wire, the electrically isolated lead wire electrically connected to a first voltage dropping device, the first voltage dropping device configured to be electrically connected to an earth grounded neutral conductor;
• and
• a sensor electronics module configured to measure a voltage drop across the first measuring resistor, the voltage drop being directly proportional to a voltage between the first power line conductor and the earth grounded neutral conductor.

A device for measuring the voltage of an electric power line conductor for a power system comprising:

• a first electrically conductive housing configured to be installed on a first power line conductor;
• a first virtual grounding member configured to electrically ground the first housing to a first power line conductor voltage;
• a first measuring resistor electrically connected between the first virtual ground member and an electrically isolated lead wire, the electrically isolated lead wire electrically connected to a first voltage dropping device, the first voltage dropping device configured to be electrically connected to an ungrounded neutral conductor;
• and
• a sensor electronics module configured to measure a voltage drop across the first measuring resistor, the voltage drop being directly proportional to a voltage between the first power line conductor and the ungrounded neutral conductor.