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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 gives a new more practical software reliability model based on architectures of software components. This model uses semi-Markov chain and can give the quantitative evaluation about the digital protection's software. It analyzes the relation between the material architecture of software's modules and the reliability of software then changes the model into a semi-Markov one based on the...
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