The excitation control system has two functions, which are also referred to as performance requirements. The first is to provide the DC electric energy to the excitation winding of the synchronous generator and thus to provide the rated voltage value at the generator terminals. The second is to perform the controlling, limiting and protection functions necessary for a successful operation of the power system. Any system depending on special application and excitation includes some or all of these functions. In this study, a novel and functional user interface developed with LabVIEW for over excitation limiter (OEL) have been presented. This interface provides monitoring, recording, range comparing and protection for OEL, frequency and voltage quantities with the enable/disable functions for all actions.