IMPROVING THE PROTECTION OF 330KV TRANSMISSION LINE USING PHASOR MEASUREMENT UNIT (PMU) BASED RELAY

This paper improves the protection of 330kV transmission line using a Phasor Measurement Unit (PMU) based relay. This aim is to ensure that accurate line protection is provided on the TCN Alaoji-Onitsha 330kV Transmission Line and by extension the entire grid if PMUs are recommended and deployed on the interconnected lines which will enhance the present use of Supervisory Control and Data Acquisition (SCADA) for System Grid Operations Management. In this study, the 330kV Transmission 31-Bus Bars and Lines with their respective parameters were characterized. To achieve this, the TCN Onitsha-Alaoji 330kV Transmission line was simulated with and without the deployment of Phasor Measurement Units. This was implemented using Power System Analysis Toolbox (PSAT) MATLAB toolbox blocks for electric power system analysis and simulation. The simulated result was presented, discussed, and compared. Results of simulations showed that the PMU-based protection scheme improved the protection of the Nigeria 330kV transmission line (Onitsha-Alaoji Line) by 34% relative to the conventional protection scheme.
Keywords: PMU, SCADA, PSAT, TCN, Transmission line, Alaoji-Onitsha, Protection