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Physics Maths Engineering

Correlation-based polarity-check algorithm for instrument transformers

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R. A. Mahmoud,

R. A. Mahmoud


E. S. Elwakil

E. S. Elwakil


  Peer Reviewed

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© attribution CC-BY

  • 0

rating
403 Views

Added on

2024-12-25

Doi: https://doi.org/10.1186/s43067-024-00172-y

Related Subjects
Physics
Math
Chemistry
Computer science
Engineering
Earth science
Biology

Abstract

AbstractA polarity identification is very important for operation of transformers, measurement and protection equipment, where it is useful in analyzing of transformer connections and operation as well as testing of protective systems. Moreover, it’s essential in assessment of power systems performance during both normal and abnormal operation. Ensuring the correct polarity of the primary and secondary windings in voltage and current transformers is of paramount importance for various measurement and protection schemes in power networks. This paper proposes a digital polarity detector and tester using correlation coefficients and nine polarity indices calculated for instrument transformer signals. In order to test the performance of the proposed polarity tester algorithm, MATLAB code is imported to the LABVIEW model, and the numerical data obtained from the synchronous generator terminals via instrument transformers are interfaced with the computer through the Data Acquisition Card (DAC). The experimental system consists of a motor-generator set supplying a three-phase inductive load with instrument transformers connected to measure each phase voltage and current. The obtained results for various operating conditions and different types of abnormal conditions prove that the suggested algorithm is accurate, reliable and applicable to smart grids and substation automation systems. It can be considered as an integrated system incorporated with digital fault recorders, relays and meters.

Key Questions

What is the main purpose of the proposed algorithm?

The proposed algorithm aims to detect polarity errors in voltage and current transformers using correlation coefficients for improved protection and measurement accuracy.

How does the algorithm test transformer polarity?

The algorithm calculates auto and cross-correlation coefficients of the measured voltage and current signals to identify polarity conditions.

What types of operating conditions were tested?

The algorithm was tested under normal and abnormal conditions using a motor-generator system to evaluate performance in various scenarios.

Why is polarity checking crucial in power systems?

Correct polarity ensures proper operation of protection schemes, power meters, and synchronization processes, preventing malfunctions in electrical systems.

How accurate is the proposed polarity detection algorithm?

The algorithm is shown to be accurate, reliable, and capable of detecting polarity errors with a fast response time in real-time applications.

How can the algorithm be implemented in practical systems?

The polarity detection system can be integrated into digital relays, meters, and fault recorders for smart grids and substation automation.

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ARTICLE USAGE


Article usage: Dec-2024 to May-2025
Show by month Manuscript Video Summary
2025 May 142 142
2025 April 65 65
2025 March 58 58
2025 February 50 50
2025 January 69 69
2024 December 19 19
Total 403 403
Show by month Manuscript Video Summary
2025 May 142 142
2025 April 65 65
2025 March 58 58
2025 February 50 50
2025 January 69 69
2024 December 19 19
Total 403 403
Related Subjects
Physics
Math
Chemistry
Computer science
Engineering
Earth science
Biology
copyright icon

© attribution CC-BY

  • 0

rating
403 Views

Added on

2024-12-25

Doi: https://doi.org/10.1186/s43067-024-00172-y

Related Subjects
Physics
Math
Chemistry
Computer science
Engineering
Earth science
Biology

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