Abstract
The mathematical model of automatic short-circuit calculation is proposed, that is directly used in coal mine high-voltage grid. The model combinates incidence matrix with short-circuit calculation in mine high-voltage grid. According to the connectivity of single-direction graph, the model describes the power supply relation matrix of branches node in coal mine high-voltage grid by the incidence matrix of bus node and branch node. The short-circuit calculation of all short-circuit points is achieved, according to the short-circuit matrix of three-phase and two-phase short-circuit current in all short circuit points given by the model. The analysis results show that the model can realize automatic short-circuit calculation accurately in coal mine high-voltage grid, and it provides a foundation for studying the performance of automatic short-circuit calculation and adaptive setting calculation of multiple fault operation mode.
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