Continuous Measurement of Voltage Distribution on a Polluted Insulator String

A method is described of measuring the voltage simultaneously at several points along a high-voltage insulator string under artificial conditions of severe salt pollution. Electrostatic probes placed opposite the points to be measured give signals from which a simple computer derives the original voltages. Disturbance of the voltage distribution is a minimum and no actual contact is made with the insulator. A response at frequencies up to more than 500c/s and an accuracy of ±5% are obtained.