Thus different protection devices are used for Power System Protection out of which numerical relays embedded with digital signal processor (DSP) are able to improve the protection operations significantly. The data acquisition device designed in this paper is specifically used for the collection of various data of relay protection test instruments. The design selects DSP as the core controller of the data acquisition device. The. The relay protection device is the core equipment that ensures the safe and stable operation of a power grid. These relays are capable of performing complex processing faster and with higher accuracy as. DSP series devices are 8A power relays that are nearly as small as signal relays.