Development of a Method for Location of a Damaged Overhead Power Line Section in Case of Single-Phase Earth Faults

Single-phase earth faults (SPEFs) are the predominant type of damage in medium voltage networks and the root cause of accidents with significant economic damage. Damage location (location of damaged power line section) in the case of SPEF on an overhead power line (OPL) allows not only to reduce the time for SPEF location, but also to prevent the transition of the SPEF into a double earth fault. The article is devoted to the development of a method for location of the damaged OPL section using digital measuring transformers as primary converters. The proposed method is based on the measurement of electrical values at SPEF on the buses of the substation and at the sending ends of the OPL branches. The method is implemented in a prototype of 6 (10) kV automated power control and metering station (APCMS).