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According to a field case on the mal-operation of transformer differential protection in the ultra-high voltage (UHV) experiment project in China, a new scheme of second harmonic blocking criterion is proposed in this paper. Based on the simulation model of UHV transformer established in MATLAB/SIMULINK, the causes of mal-operation is analyzed. The factors such as initial angle and remnant flux which...
A commercial system that performs syntactic and semantic analysis during a TV advertising break could facilitate innovative new applications, such as an intelligent set-top box that enhances the ability of viewers to monitor and manage commercials from TV streams.
The mal-operation of transformer differential protection will occasionally take place after the removal of external fault due to current-transformer (CT) saturation. Study show that CT saturation can be divided into three kinds. Firstly, the influencing factors of CT saturation and effect of CT saturation to transformer differential protection are studied. Secondly, this paper analyzes the characteristic...
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