A method for detection of sustained earth-faults in rural overhead lines protected by petersen coils

The paper describes a method of localizing sustained earth-faults on systems protected by Petersen coils. The method is based on the measurement of variations of electrostatic field strength in the vicinity of the overhead line. A description is given of the apparatus used and of results of tests made. The practical applications of the method are explained. An additional use of the apparatus is indicated as a voltage detector on overhead high-voltage lines.