NDLI: Accurate coordination method based on the dynamic model of overcurrent relay for industrial power networks taking contribution of induction motors into account

Content Provider	IET Digital Library
Author	Maleki, Mahdi Ghotbi Chabanloo, Reza Mohammadi Farrokhifar, Meisam
Abstract	Induction motors are widely used in the industry. These motors contribute to short-circuit currents (SCCs) by generating transient currents. The transient component in the SCC causes a change in the operating times of the overcurrent (OC) relays and miscoordination between the main and the backup relays. Therefore, the conventional relay coordination methods that use fixed SCCs for a specific fault location are not suitable for industrial power networks. In addition, the contribution of induction motors may cause a false trip in non-directional OC relays at healthy feeder. Here, a method based on the dynamic model of the OC relay is proposed to take the effect of transient component of SCC into account in relays coordination. A new set of constraints is added to the conventional coordination constraints in order to solve the false trip issue. In this case, an optimisation algorithm is needed to coordinate non-directional OC relays. The proposed method is implemented in a power network of cement factory and the results indicate the effectiveness of the proposed method. Here the genetic optimisation algorithm has been used and the simulation has been achieved using DIgSILENT and MATLAB software.
Starting Page	645
Ending Page	655
Page Count	11
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 4, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.0325
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-12-10
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Accurate Coordination Method Asynchronous Machine Backup Relays Conventional Coordination Constraint Conventional Relay Coordination Method Distribution Network Dynamic Modelling False Trip Issue Fault Location Genetic Algorithm Induction Motors Industrial Power Network Miscoordination Nondirectional OC Relay Optimisation Technique Overcurrent Protection Overcurrent Relay Power Distribution Fault Power Distribution Protection Power Network Power System Protection Relay Coordination Relay Protection SCC Short-circuit Current Specific Fault Location Transient Component Transient Current
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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