Instantaneous-Power-Based Busbar Numerical Differential Protection

This paper presents a new method for busbar differential protection based on the instantaneous power concept. In order to do so, the instantaneous power per phase of each network element connected to the busbar is computed by using the instantaneous current values and a voltage memory action strateg...

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Bibliographic Details
Published inIEEE transactions on power delivery Vol. 34; no. 2; pp. 616 - 626
Main Authors Vasquez, Francis A. Moreno, Silva, Kleber M.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Busbars
Busbars protection
Circuit faults
Computer memory
Computer simulation
Current transformers
differential protection
Electricity substations
Evolution
Fault currents
Fault detection
Faults
Impedance
Instantaneous current
instantaneous power differential protection
Relays
Saturation
Security
Software algorithms
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Summary:This paper presents a new method for busbar differential protection based on the instantaneous power concept. In order to do so, the instantaneous power per phase of each network element connected to the busbar is computed by using the instantaneous current values and a voltage memory action strategy. The performance of the proposed technique is compared to one of the traditional instantaneous-current-based differential protection algorithms, which is widely used by manufacturers of commercial relays. Both internal and external faults, as well as evolving external-to-internal faults, were simulated in a power substation with double-bus single-breaker configuration using the software ATPDraw. The obtained results reveal that the proposed algorithm is twice or more faster than the traditional instantaneous-current-based algorithm for most of the internal and evolving external-to-internal faults, while ensuring secure operation for external ones even when severe current transformer (CT) saturation takes place, through a new harmonic power restraint strategy. Also, since the proposed method provides faster fault detection time, the requirements for CT time to saturate may be alleviated, guaranteeing correct operation even in the case of early CT saturation.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2019.2896035