With the rules, the nodaladmittancematrix can be obtained by simple row and column transformations in the unconstrained indefinite-admittance matrix.
利用这些规则，可以通过对无约束网络的不定导纳矩阵进行初等的行、列变换得到约束网络的导纳矩阵。
2
Many optimal bus-labeling methods have been proposed in order to improve the efficiency of computation of nodaladmittancematrix in power systems and to save the computer memories.
The nodaladmittancematrix in phase coordinates of the transformer is obtained, which can be conveniently used to interface with power systems and traction networks in related analyses.