XÂY DỰNG VÀ CẤU HÌNH SƠ ĐỒ LOGIC CHO RƠLE BẢO VỆ ĐIỆN ÁP VÀ TẦN SỐ TẠI TRẠM BIẾN ÁP 110KV

Abstract

The function of voltage and frequency protection relays is to ensure stability in the power system through load shedding or isolating the local grid in over voltage, drop voltage of phase - phase or phase - earth situation and over frequency or low frequency status. Relays installed at stations make the protection methods more efficient: reliable, selective, fast and economic. This paper focuses on presenting characteristics, logic diagram design, application software and configuration of SEL715A relay for protection frequency and voltage at 110kV stations.