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 *R _{A}*,

*R*,

_{B}*R*. To simulate a break, for example, in phase

_{C}*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 ** A** in Matlab: файл A_break.m