This paper makes a detailed analysis based on the power frequency sine all the current differential protection criterions,based on the fault component differential protection criterions,based on the current fault component and the complex percentage differential protection criterion of four kinds of the basic principle of criterion.The conventional current differential protection is susceptible to fault the weaknesses of the influence of interim resistance,and to strengthen the differential protection action sensitivity,fault component based on sample value current differential protection,the principle of the criterion,action characteristics were discussed,the simulation and analysis through MATLAB,and the result shows that the fault component based on sample value current differential protection in the reliability and sensitivity is better than conventional current differential protection.
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