The technique of finite-impulse-response filtering applied to digital protection and control of medium voltage power system

When developing a relaying algorithm, digital filtering is an important step. A method to design a FIR filter based upon two objectives is given. These objectives are to allow easy computation and to be as close as possible to a given frequency response. With the help of an example, an original method is also proposed to evaluate the complete sequence of a digital relaying algorithm, based on FIR filtering. It is shown how such an algorithm can be used, not only for protection but also for each function of an integrated protection and control system.<>