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Transformers neutral grounding accessing small reactance is an effective measure to restrain short circuit current in 500kV power grid. But accessing small reactance will bring changes to the zero-sequence parameters of system. The relay protection, especially the main transformer protection and transmission line protection nearby will be affected and act incorrectly when unsymmetrical earth fault...
This paper establishes a simulation platform of large scale power grid with multi-infeed DC using EMTDC, in order to analyze the interaction of AC/DC systems and its influence on protective relaying. The principles and methods of the models adoption, the scale of power system, network simplification and data processing are dealt with to balance the simulation demands between precision and efficiency...
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