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This paper proposes a new perturbation method for the passivity enforcement of MoC-based macromodels. The method generalizes quadratic programming with equality constraint introduced for lumped macromodels. Numerical examples show that the presented method's superiority.
The measuring technique of the synthesis electric field in the vicinity of the DC transmission lines becomes more and more important for the evaluation on the electromagnetic environment and the detection of the insulation faults, and the field mill is frequently used for the measurement of the DC electric field. The parameters of the field-mill affects its measuring accuracy, therefore in the paper...
The character of the voltage at the end of the opened phase conductor was studied and an improved voltage criterion was proposed to distinguish between transient and permanent faults. The performance of the improved criterion is hardly influenced by the load currents of healthy phases, transmission line length, fault distance and fault earth resistance. For EHV/UHV lines with shunt reactors, the improved...
The analysis in theory shows that the protection based on the energy ratio of a high frequency component to a low one can be applied on the EHV lines equipped with shunt reactors and its performance is hardly influenced by the number and locations of reactors. The protection has satisfactory performance to metallic short circuit faults, so it's immune to the different fault earth resistances. If a...
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