Power Flow Based Monitoring Of State Estimation Using The Weighted Least Square

his current study aims to analyzing the results of measurements of Remote Terminal Unit and detect bad measurement on the bus by using State Estimation. The research was conducted at Load Control Unit of PT. PLN SULSELRABAR (South, Southeast, and West Sulawesi, hereafter SULSELRABAR). The data used in the analysis were data of channel impedance, and the results of RTU measurements, including data about bus, voltage, MVAR injection, and load data in the electric system of SULSELRABAR. The results reveal that from 37 buses in the system, 22 buses can be monitored via the RTU, and 30 buses can be estimated by using the estimation method with Weighted Least Square (WLS). Based on the results of state estimation, bad measurements occurred on the bus of 27 and of 29, with error levels of 0.0575 and 0.0871 respectively.