Numerical Distance Relay in Scheme for Transmission Line Fault Using IOT
Keywords:
Computer numerical control; Discrete Fourier transforms; Electrical fault detection; Phasor measurement; Power system faults; Power system protectionAbstract
Impedance reach of numerical distance relay is severely affected by Fault Resistance (RF), Fault Inception
Angle (FIA), Fault Type (FT), Fault Location (FL), Power Flow Angle (PFA) and series compensation in
transmission line. This paper presents a different standalone adaptive distance protection algorithm for detection,
classification and location of fault in presence of variable fault resistance. It is based on adaptive slope tracking
method to detect and classify the fault in combination with modified Fourier filter algorithm to locate the fault. To
realize the use of the planned technique, simulations are performed in PSCAD using multiple run facility & validation
is carried out in MATLAB® considering wide variation in power system disturbances. Due to adaptive setting of
quadrilateral characteristics in accordance with variation in fault impedance, the proposed technique is 100 %
accurate for detection & classification of faults with error in fault location estimation to be within 1 %. Moreover, the
proposed technique provides significant improvement in response time and estimation of fault location as compared to
existing distance relaying algorithms, which are the key attributes of multi-functional numerical relay.
