In This thesis is concerned with the application of Dynamic Voltage Restorer (DVR) as a fault current limiting device. Power systems are always facing expansion and complexity due to increasing demand to electric energy. While this expansion results in both voltage profile and higher reliability, it naturally increases the short circuit capacity of network bus bars. This, in turn, imposes some expenses to network operators for upgrading network components, and particularly circuit breakers. Therefore, network operators and designers always try to avoid these expenses by proper methods and without adverse effect on the advantages of network expansion. There are many methods and techniques that may be used for control and limitation of the magnitude of short circuit current in a power system network. Network reconfiguration is a method by which the operator can reduce the number of sources contributing to short circuit currents, these reducing it’s magnitude. Another method is to use the so-called Fault Current Limiter (FCL). The transformer type superconducting fault current limiter, has many advantages such as the design flexibility of the current limiting device. The transformer type superconducting fault current limiter is composed of a series transformer and a superconducting current limiting device. The primary winding of the transformer is connected in series to the power system line, and the secondary winding is short circuited through the superconducting current limiting device whose normal resistance plays an important roles in limiting the fault current. In this thesis the basic characteristics and the design indexes of the transformer type superconducting fault current limiter are Key Words: fault current reduction, FCL, Dynamic Voltage Restorer (DVR)