Building of Auto Reclose Function on Numerical Protection Relays by Matlab - Simulink Software

In present-day power systems, an automatic reclosure function (F79) has been proposed in the manufacturer of numerical protection relays such as ABB, Sel, Areva, Siemens,... which are individual algorithms to re-energize a transmission line after a transient fault trip. The objective of this paper is to review the various configuration and setting parameter considerations for applying F79 to relay protection. After that, we analyse a disturbance fault record of relay Schneider P443 at a 171 feeder of 110kV Tinh Phong substation, Quang Ngai Province and simulate F87L, F79 and F25 on relay Siemens 7SL82 at a 110kV Tam Ky – Tam Anh overhead line, Quang Nam Province with Matlab Simulink software under conditions such as a permanent fault, a transient fault,... The result is presented in order to determine the choice of suitable parameters, evaluate accurate reliability and time of successful signal F79, unsuccessful F79, and block F79