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* = 10^{10} 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 10^{10 }Ohms. Similarly model faults in other phases.

The attached file shows the calculation of the break matrix in Matlab: файл A_break.m