Evaluasi Setting Distance Relay Pada Sutt 150 Kv Sistem Ketenagalistrikan Sulselrabar

Abstract

Transmission is a vital component of the power system that functions to deliver electrical energy from generation plants to distribution networks. Given the long distances involved, the probability of system disturbances increases significantly. To prevent these disturbances from spreading, a protection system is implemented—one of which is the distance relay. A distance relay operates based on impedance measurement, activating when the measured impedance from current (CT) and voltage (PT/CVT) inputs falls below a set threshold. This study aims to evaluate the distance relay settings applied by PLN on the 150 kV transmission line, specifically whether they conform to standard guidelines and existing literature. The evaluation was conducted using the DIgSILENT PowerFactory software, a specialized tool for advanced, integrated, and interactive analysis of power system operations and control. The simulation focused on the transmission line between GI Pangkep and GI Kima, with a line impedance of 15.14 Ω. The calculated settings yielded Z1P = 12.112 Ω at t1 = 0 s; Z2pri = 18.168 Ω at t2 = 0.8 s; and Z3pri = 19.74 Ω at t3 = 1.2 s. However, a comparison with PLN's actual settings revealed discrepancies—PLN applies a 100% zone 1 setting, which deviates from recommended standards. This is primarily due to the absence of active teleprotection on the GI Pangkep – GI Kima line. The findings indicate that while PLN's approach addresses specific operational limitations, it does not align with established guidelines, highlighting the need for setting adjustments to ensure reliable and effective protection.