Under-voltage Protection of Power Transmission Lines

The continuous monitoring of the protection relay of the transmission line is desirable to ensure the system disturbance such as fault inception is detected in the transmission line. Therefore, the fault on the transmission line needs to be detected, classified, and located accurately to maintain the stability of the system. This paper presents design enhancement and development under voltage relay in power system protection using MATLAB/Simulink. The contacts of the under-voltage relay operate when voltage drops below a set voltage. It is used for protection against voltage drops to detect the short circuit. This work is carried out for all types of faults which only related to one of the parallel transmission lines. In overall operation conditions, the sample data were generated for the system by varying the different fault types and fault locations. This design system proposes the use of the MATLAB/Simulink-based method for fault classification and location of various types of faults.