Dynamic zone selection for busbar protection Using graph theory and path analysis

•Logic equations are automatically obtained, therefore, removing the possibility of user error in entering the equations.•Measuring and tripping zones are represented as graphs, which facilitates the implementation of the method and expansion of the busbar arrangement dynamic zone selection logic.•T...

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Bibliographic Details
Published in:Electric power systems research 2021-08, Vol.197, p.107241, Article 107241
Main Authors: Bainy, Rômulo G., Johnson, Brian K., Guzmán, Armando
Format: Article
Language:English
Subjects:
Algorithms
Busbars
Graph theory
Graphs
Mathematical analysis
Power system protection
Protection zone selection
Protective relaying
Software
Studies
Substation
Switching
Switching sequences
Transformers
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Summary:•Logic equations are automatically obtained, therefore, removing the possibility of user error in entering the equations.•Measuring and tripping zones are represented as graphs, which facilitates the implementation of the method and expansion of the busbar arrangement dynamic zone selection logic.•The proposed method also introduces a low-impedance differential protection scheme based on graph theory.•The equations obtained by the method were tested using real-time simulation and a commercially available relay.•Enhanced representation of polarity of CTs by using directed edges This paper presents a detailed description of a dynamic zone selection approach for busbar protection using path analysis and graph theory. The main benefit is that the dynamic zone selection logic equations for busbar protection applications are automatically obtained by an offline software-based tool. The method accounts for normal busbar-switching sequences, in-service transfer, bypassed current transformers, breaker substitution, paralleled busbars, and a check zone. The equations can be set up and executed in existing protective relays. The method was tested in a busbar arrangement for different switching scenarios and fault conditions, and the results have proven its effectiveness.
ISSN:0378-7796
1873-2046
DOI:10.1016/j.epsr.2021.107241