Research of remote backup protection functioning at the software and hardware complex RTDS

Remote backup protection is installed at the ends of the power line of 35-220 kV and provides detection of short-circuit on the low-voltage side of branch transformers. To support remote protection on 110 kV lines and above with two or multi-way power feed, it is mandatory to implement a three-stage remote protection from interphase short-circuit (phase-to-phase fault). To implement line protection with remote protection on a substation (in case of protection equipment operation failure, breaker failure on high voltage side and signal transfer device failure) seems to be more difficult comparing to a line short-circuit. It is related to limited possibilities of line protection sensitivity and, in many cases, operation parameters of a loaded line that define relay protection stage protection significantly exceed nominal power of the branch transformer.