CT Dimensioning for Single Slope Biased Differential Protection: Balancing Stability with Sensitivity
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Abhishek Khanna
Abstract
This paper demonstrates a systematic and objective approach for dimensioning of current transformers (CT) for biased differential relay. The paper proposes some mathematical formulae which allow protection engineers to dimension CT for meeting requirements imposed by sensitivity, and yet maintain stability for through fault. The formulae can be extended to CT with antiremanence magnetic paths. The suitability for the method is demonstrated for various sensitivity objectives and system conditions. The paper also discusses the implementation for different measurement algorithms.
References
1. Kasztenny B, Mazereeuw J, Demetrios KJ. CT saturation in industrial applications; analysis and application guidelines. Prot Control J 2006:5–24. Available online on www.GEMultilin.com.Search in Google Scholar
2. Khanna A. CT Dimensioning for Transmission line protections – an investigation into increasing saturation tolerance for protection functions. European Transactions on Electrical Power 2011; 1:608–623.10.1002/etep.465Search in Google Scholar
3. Gangadharan PK, Sidhu TS, Klimek A. Influence of current transformer saturation on line differential protection. IET J Generation Trans Distrib 2007;1:270–7.10.1049/iet-gtd:20060138Search in Google Scholar
4. Gangadharan PK, Sidhu TS, Finlayson GJ. Current transformer dimensioning for numerical relays. IEEE Trans Power Deliv 2007;22:108–15.10.1109/TPWRD.2006.881601Search in Google Scholar
5. IEC 60044–6. Instrument Transformers Part −6. Requirements for protective current transformers for transient performance, 1992 ed. International Electrotechnical Commission.Search in Google Scholar
6. Khanna A. Analysis of high impedance protection considering CT-transients and air gapped CTs with setting recommendations and a new fast acting algorithm for high impedance numerical relays. Int J Emerg Electric Power Syst 2012;12 Volume 12, issue 1. published online on 12-02-2011.10.2202/1553-779X.2589Search in Google Scholar
7. Zocholl SE, Guzma’n A, Hou D. Transformer modelling as applied to differential protection. Available online at www.selinc.com.Search in Google Scholar
8. Demetrios TA, et al. Mathematical models for current,voltage and coupling capacitor voltage transformers. IEEE Proc Power Deliv 2000;15:62–72.10.1109/61.847230Search in Google Scholar
9. Zieglar G. Numerical differential protection. Erlangen, Germany: Pulicis Corporate Publishing 2005:55–8.Search in Google Scholar
The views expressed here are solely of the authors and do not reflect the views of the organization to which the author belongs.
© 2013 by Walter de Gruyter Berlin / Boston
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Articles in the same Issue
- Masthead
- Masthead
- Research Article
- Studying Electromechanical Wave Propagation and Transport Delays in Power Systems
- Online Assessment of Voltage Stability in Power Systems with PMUs
- Design, Control, and Modeling of a New Voltage Source Converter for HVDC System
- Spatial Characterization of the Dynamic Response of Frequencies Utilizing Structural Partition Procedure for Large-Scale Power System
- Reference Current Extraction through Sliding DFT Assisted Single Phase p-q Theory for Shunt Active Power Filter
- CT Dimensioning for Single Slope Biased Differential Protection: Balancing Stability with Sensitivity
- Zonal Dynamic Equivalents Based on the Concept of Relative Electrical Distance
- Influence of Speed Governors of Hydropower Stations on Frequency Stabilization of Fixed-Speed Wind Farm
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- Parallel-Connected Photovoltaic Inverters: Zero Frequency Sequence Harmonic Analysis and Solution
