Methods of search of one-phase line-to-ground faults in electrical networks of 6 - 35 kV
The article analyses and classifies methods of search of one-phase line-to-ground faults in networks of 6 - 35 kV. Distance methods (location, wave, standing wave, loop, capacitive, by the values of emergency state) set and used on substation to disclose damaged sections of a line, are covered in depth. Topographic methods (inductive, electromechanical, acoustic), which allow to find out a place of one-phase line-to-ground faults during movement along the line, are also given in details. There are different examples of usage of different instruments and microprocessor-based protective devices to determine the place of line-to-ground fault.