During operation of electric power systems, not only short-circuit modes can occur, but also breaks. The phase coordinate method allows you to simulate wire breakage.
In fig. 1 shows a circuit replacement circuit. At the point of wire breakage, a large active resistance is set (R = 1010 Ohms).
Fig. 1. Break equivalent circuit
In the phase coordinate method, the break is described by the direct transfer matrix
where , , .
Cliff modeling is performed using resistances , , . To simulate a break, for example, in phase A, the resistance is set equal to 1010 Ohms. Similarly model faults in other phases.
The attached file shows the calculation of the break matrix in Matlab: файл A_break.m