Statistical analysis of digital distance protection

Problems of selection of efficiency algorithms of distance protection for a different type high voltage transmission lines are very topical. In this paper criteria and a program for statistical analysis of distance protection are considered. This program is based on the Monte Carlo method. The method is used for obtaining of statistical estimation of distance protection efficiency and graphical presentation of statistical estimations in operating characteristics for different modes in modern computers. Examples of statistical simulation of distance relay operation for phase-to-ground faults are shown. The proposed method helps users to select efficiency parameters and algorithms of distance protection. It may be used both in the stage of the distance protection synthesis, and of development to make a reasonable decision in selection of protection settings, co-ordination of primary and reserve protection characteristics.