Therefore, it is advisable to take the following method for grid three-phaseshort-circuit current calculation.
为此，建议采取以下的方法进行电网三相短路电流计算。
2
Based on the detailed analysis of basic principle, the traditional three-phaseshort-circuit criterion of phase selection element based on sudden-change of phase current differential is improved.
Two Solutions to the model equivalent parameter estimation are proposed, one based on the three-phaseshort-circuit capacity, this method works with good computational speed, but accuracy is not high;