An Investigation of Relay Protections Trips in Medium Voltage Power Grids

摘要: The relay protections, used in case of phase-to-phase faults and phase-to-ground medium voltage electrical networks, as types are the overcurrent protections protection. most common power line’s ones. It is expected that largest number trips will be from protections. An investigation for activations a five-year period 110/20 kV substation has been made. analysis by successful unsuccessful auto reclose grid operational safety was analyzed based on obtained results.