Waveshape recognition technique to detect current transformer saturation

Ali Hooshyar; Majid Sanaye-Pasand

Waveshape recognition technique to detect current transformer saturation

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Author(s): Ali Hooshyar ¹ and Majid Sanaye-Pasand ¹
- Affiliations: 1: Control and Intelligent Processing Center of Excellence, School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Iran
Source: Volume 9, Issue 12, 04 September 2015, p. 1430 – 1438
DOI: 10.1049/iet-gtd.2014.1147 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 01/05/2014, Accepted 15/03/2015, Revised 08/02/2015, Published 21/04/2015

This study presents a technique to identify current transformer (CT) saturation based on waveshape properties of the CT secondary current. First, a variable-length window, designated as the symmetry assessment window (SAW), is defined. Certain distinctive features of the distorted and undistorted currents inside the SAW are extracted by defining two variance functions. Using the extracted features, a new criterion is introduced to detect CT saturation. The proposed method is unaffected by fault current characteristics and CT variable parameters, such as CT burden, core remanence and its magnetising curve. One major contribution of this method is allowing cheaper measurement systems for busbar protection by easing the relay CT requirements. Analysis of real power system fault currents in a real-time manner using a hardware setup is accompanied by PSCAD/EMTDC simulation results to verify the accuracy and high speed of the proposed technique in various conditions.

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