IMPEDANCE BASED FAULT DETECTION IN TRANSMISSION LINES
Keywords:
Fault location, impedance-measurement, Programmable Logic Controller(PLC), Supervisory Control And Data Acquisition (SCADA), power system faults, power system reliability, transmission line measurementsAbstract
For calculating the fault distance in a transmission line various impedance based algorithms have been
formulated. Every algorithm has its own input requirements. It is important to understand each fault locating method for
the purpose of choosing the most appropriate algorithm. This project gives us a detailed study of impedance based one
ended fault location algorithms and how error sources DC offset, CT saturation, untransposed lines, system load,
uncertainity in earth resistivity and mutual coupling effect each algorithm. The location of a fault is estimated with the
help of PLC and SCADA. The program to find the fault distance is written in PLC and then the PLC is interlinked with
SCADA for controlling and monitoring the process. From field data testing and theoretical analysis fault location
application scenario and data availability are the criteria for selecting suitable algorithms.
