ANALYZING AND EVALUATING THE CHARACTERISTIC OF NUMERICAL DISTANCE PROTECTION RELAY USING ETAP SOFTWARE

Abstract

The paper presents the process of automatically creating parameters for adjusting distance protection zones for a 110kV power grid with 33 nodes. After entering values of the line parameter, generator parameter, and load parameter into the Excel spreadsheet. The paper uses the Matlab GUI tool to read these data and plot the power grid to calculate the distance protection zones (Z1, Z2, and Z3) for a chosen numerical relay SEL 311L at the Buon Koup - Hoa Phu line. Next to build a grid simulation model by using ETAP software and evaluate the working of the relay with various conditions such as fault resistance, fault location, fault type and taking into account the participation of Truc Son PV source. The result of the paper provides insight into distance protection function principles to use popular on a transmission line. The statements from the paper are very consistent with reality because it overcomes one of the protective coordination challenges faced by technicians in real-world operations when checking the setting manually takes considerable time. In addition, the paper also suggests adding a limited relay library of ETAP for the manufacturer to consider such as Toshiba GRZ200, Nari RCS 902.