NDLI: Waveshape recognition technique to detect current transformer saturation

Content Provider	IET Digital Library
Author	Hooshyar, Ali Pasand, Majid Sanaye
Abstract	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.
Starting Page	1430
Ending Page	1438
Page Count	9
ISSN	17518687
Volume Number	9
e-ISSN	17518695
Issue Number	Issue 12, Sep (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/9/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2014.1147
Journal	IET Generation, Transmission & Distribution
Publisher Date	2015-04-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Busbar Protection Busbars Core Remanence CT Burden CT Saturation Detection CT Secondary Current CT Variable Parameter Current Transformer Saturation Detection Current Transformer Saturation Identification Distinctive Distorted Current Feature Extraction Distinctive Undistorted Current Feature Extraction EMTDC Simulation Fault Current Characteristic Magnetising Curve Measurement System Power Engineering Computing Power System Fault Power System Measurement Power System Measurement And Metering Power System Protection Power System Simulation Power Transformer Protection PSCAD Simulation Real Power System Fault Current Analysis Relay CT Requirements Relay Protection SAW Symmetry Assessment Window Transformer And Reactors Variable-length Window Variance Function Wavehape Recognition Technique
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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Waveshape recognition technique to detect current transformer saturation

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