INTELLIGENT TECHNIQUE FOR STABILIZING THE RESPONSE TIME OF TRANSMISSION LINE PROTECTION RELAY

Subject Area: POWER SYSTEM

It is impossible to develop a fault free system, regardless of how perfect the design might be, as time improves the system reliability and mean time to failure comes into place. This is not an exception for the new heaven transmission system. Delay in the relay response time is one of the factors identified as a challenge in the system and this affect power stability. This work presents the stabilizing response time of the transmission line protection relay using an intelligent based system. This will be achieved by the remodelling of the conventional relay employed in the existing system and optimize the operational efficiency using the singular value decomposition method. The methodology applied for the implementation of this study involves data acquisition from Enugu to Onitsha 330KV New Heaven transmission line which was done to study the conventional relay response time, considering some parameters such as the transmission capacity, line impedance, relay operating zones, transmission line distance, transformer ratings, actual relay time and nominal frequency. This methodology will enhance the operational speed and triggering time of the relays used for protection of the transmission line irrespective of the zones. The work will be implemented using Simulink and performance evaluation will be compared with the existing system and discussed. The relays in zone one are designed to trigger instantaneously. The relay in zone two are set to delay for 450ms before triggering while the relay in zone three are set to 750ms before it triggers. The result sows that the gap between the setting time and the triggering time of the relay is between (0.04 to 0.06ms).