IEC 61850-Based Centralized Protection against Single Line-To-Ground Faults in Ungrounded Distribution Systems

We developed an International Electrotechnical Commission (IEC) 61850-based centralized protection scheme to prevent single line-to-ground (SLG) faults in the feeders and busbars of ungrounded distribution systems. Each feeder intelligent electronic device (IED) measures its zero-sequence current voltage signals periodically transmits phasors a central IED via Generic Oriented Object Substation Event message. Using phasors, detects SLG busbars. To achieve protection, angle differences between currents are exploited, their calculation compensates for data desynchronization. The IEDs were implemented using MMS-EASE Lite library, while transmitted calculated based on fault simulated by Power System Computer Aided Design / Electro-Magnetic Transient Control (PSCAD/EMTDC). determined if was or busbar aggregating analyzing received from IEDs. results confirmed validity efficiency our scheme.