Fault location for multi-terminal lines

Worldwide there is a trend to increase the use of renewable energy to replace the conventional energy sources as far as possible. Beside small installations like photovoltaics panels on rooftops of private homes we can observe big wind and photovoltaics or solar farms supplying significant amounts of electrical power into the grid. These big wind, photovoltaics and solar power plants are not seldom directly connected to existing transmission or distribution lines. In this case we get transmission lines with three or more terminals.