Research on Definition of Short-Circuit Region for Γ-Source Circuit Breaker

This article proposes a method defining area of short-circuit and load step change for Γ-source circuit breaker through deriving the law between the variables of transformation ratio, coupling coefficient, load and the boundary resistance. First, the equivalent circuit as well as the steady-state an...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2024-05, Vol.39 (5), p.6271-6280
Main Authors: Song, Weizhang, Wang, Chen, An, Ning, Han, Zhenhong, Xue, Dan, Wheeler, Patrick
Format: Article
Language:English
Subjects:
Circuit breakers
Circuit faults
Coupling coefficients
Couplings
Equivalent circuits
Mathematical analysis
Resistance
Short circuits
Short-circuit region definition
Thyristors
Transfer functions
Transformers
Transient performance
Z-source converter
Γ-source breaker
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Summary:This article proposes a method defining area of short-circuit and load step change for Γ-source circuit breaker through deriving the law between the variables of transformation ratio, coupling coefficient, load and the boundary resistance. First, the equivalent circuit as well as the steady-state and transient performance of Γ-source circuit breaker are analyzed. Then, the nonlinear segment equation of the boundary resistance for definition method through theoretical calculation and experimental data is fitted to avoid misoperation opening caused by load step change. Finally, the law between the transformer ratio, coupling coefficient, the load and the boundary resistance is obtained to define an accuracy short-circuit region. The feasibility and effectiveness of the proposed method have been verified using experimental results.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2024.3361254