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Multi-terminal lines are more often used in modern power systems than before. They are becoming particularly popular in sub-transmission networks (i.e. in networks with rated voltages between 60kV – 160kV) but also in HV networks [3, 4]. Practical experience with such protection from a commercial installation in Sweden will be presented.
Numerical phase comparison protection overcomes the problems faced on the long EHV transmission system by providing dynamic compensation of charging current at all times thus providing stability during external fault conditions. With the implementation of impedance starters complimenting current and voltage starters, enhances the sensitivity thus enabling the gap detection algorithm, which is based...
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