A comparison of two numerical relay low impedance restricted earth fault algorithms in power transformer

• Published in: 2011 8th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology pp. 792 - 795
• Main Authors: Nimtaj, Babak, Mahmoudi, Amin, Palizban, Omid, Kahourzade, Solmaz
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.05.2011
• Subjects: 3I; A Decaying factor which A<1; Auxiliary negative sequence restraint current; Auxiliary positive sequence restraint current; Auxiliary zero sequence restraint current; Circuit faults; Differential current; Fault currents; Fundamental component of residual current; Fundamental component of star point current; Intermediate restraint current; K Stabilization factor; L−1; Manuals; Negative sequence current; Positive sequence current; Residual current (summation of three phase); Restraining current; Saturation magnetization; Star point current; Surges; time constant; Transformer cores; Trip effect current; Zero sequence current; ϕ Limit angle
• ISBN: 1457704250; 9781457704253
• DOI: 10.1109/ECTICON.2011.5947959

Low impedance restricted earth fault protection is one of the protection functions to protect the transformer winding with earthed star point. This paper presents a critical comparison of restricted earth fault between General Electric algorithm and Siemens Algorithm. Advantages and disadvantages of selected algorithms are investigated based on speed, sensitivity and security. The relay operation characteristic curves and restraint currents for each of algorithms are simulated by MATLAB SIMULINK.