“…In the present case, the maximum VPSI occurs at S equal to 3.0, in consequence the S SC , applying (26), correspond to 10 p.u., as it is expected. Once S SC is known, it is possible to find V S using (19), after that E is obtained and finally Z TH can be determined. In this paper, this interesting condition is used to define a basic scheme of voltage stability monitoring based on S SC as it will be presented in the next section.…”