Modeling and Simulation of Overcurrent and Earth Fault Relay with Inverse Definite Minimum Time
Transmission networks are an important part of an electric power system. The transmission lines not only have high power transmission capacity but also they are prone of larger magnitudes. Different types of faults occur in transmission lines such as single line to ground (L-G) fault, double line to ground (L-L-G) fault, line to line (L-L) fault and three phases (L-L-L) fault. These faults are needed to be cleared quickly in order to reduce damage caused to the system and they have high impact on the electrical power system equipment’s which are connected in transmission line. The main fault in transmission line is L-G fault. Therefore, protection relays are needed to protect transmission line. Overcurrent and earth fault relay is an important relay used to protect transmission lines, distribution feeders, transformers and bus couplers etc. Sometimes these relays can be used as main protection or backup protection. The modeling of protection relays is important to indicate the effects of network parameters and configurations on the operation of relays. Therefore, the modeling of overcurrent and earth fault relay is described in this paper. The overcurrent and earth fault relays with standard inverse definite minimum time are modeled and simulated by using MATLAB/Simulink software. The developed model was tested with L-G, L-L-G, L-L and L-L-L faults with various fault locations and fault resistance (0.001Ω). The simulation results are obtained by MATLAB software which shows the feasibility of analysis of transmission line protection with overcurrent and earth fault relay.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3593184Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 342
 Himan Mahajan, Ashish Sharma: “Various Techniques used for Protection of Transmission Line A Review”, International Journal of Innovations in Engineering and Technology, Vol. 3 Issue 4 April 2014.
 Manhattan, Kansas: “Design of A Differential Protection Scheme for A 345 kV Transmission Line Using SEL 311L Relays”, 2014.
 Manhattan, Kansas: “Protection and Communication for A 230 kV Transmission Line Using A Pilot Overreaching Transfer Tripping (POTT) Scheme”, 2013.
 H.J. Altuve, K. Zimmerman, and D. Tziouvaras: “Maximizing Line Protection Reliability, Speed, and Sensitivity”, Annual Georgia Tech Protective Relaying Conference, 20-22 April 2016.
 P. R. Subcommittee: “Protective Relaying Philosophy and Design Guidelines PJM Relay Subcommittee”, 2013.
 Fecime; “Chapter 9, Overcurrent Protection for Phase and Earth Faults”, Network Protection and Automation Guide, PP. 123-151, 2008.
 Z. Wang, J. Li, W. Yang, and Z. Shi: “Impact of Distributed Generation on the Power Supply Reliability”, IEEE PES Innovative Smart Grid Technologies, 2012.
 Seyed Hadi Mousavi Motlagh, Kazem Mazlumi: “Optimal Overcurrent Relay Coordination Using Optimized Objective Function”, Hindawi Publishing Corporation ISRN Power Engineering Volume 2014.