Power Systems Modelling and Fault Analysis

9 Control and limitation of high short-circuit currents

9.1 General

Many power system networks can be subject to high potential short-circuit fault currents. Some of the reasons for this include the connection of new generation plant to transmission and distribution networks, the strengthening of the power networks by the addition of new parallel routes, the use of low impedance equipment to improve voltage and reactive power control and system transient stability, the connection of many induction motors in industrial networks, and others. In this chapter, we describe some of the practical methods and techniques that may be used for the control and limitation of the magnitude of short-circuit currents in both power system operational and design ...