Results 271 to 280 of about 1,138,456 (310)

A novel CT saturation identification scheme for differential protection of generators

2011 IEEE Power and Energy Society General Meeting, 2011
A new CT saturation block scheme for generator differential protection implemented with mathematical morphology filter is presented. By use of the excellent singularity detecting together with the noise-repressing abilities, the time difference between fault occurrence and differential current emergence instant can be extracted in real time with very ...
Xiangning Lin, Zhiqian Bo
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A novel CT saturation detecting algorithm unaffected by a remanent flux

2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262), 2001
This paper proposes a novel current transformer (CT) saturation detecting algorithm unaffected by a remanent flux. At the instants of the beginning/end of saturation, the magnetizing inductance of the core changes significantly, resulting in severe wave distortion of the secondary current.
Y.C. Kang, S.H. Ok, S.H. Kang
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Microstructure of saturated bentonites characterized by X-ray CT observations

Engineering Geology, 2009
Abstract Bentonite is a very attractive raw material as a compacted clay liner at general waste disposal sites and also as a buffer material at radioactive waste disposal sites. It has been considered that the permeability of bentonite, the most important index for evaluating barrier materials, is closely related to its microstructure. Recent studies
Chie Kawaragi, Tetsuro Yoneda, Tsutomu Sato, Katsuhiko Kaneko   +3 more
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CT Saturation Calculations: IEC standards and nonconventional instrument transformers

IEEE Industry Applications Magazine, 2012
This article, completing a series of three articles, presenting themes related to current transformers (CTs), including test results, designed and tested from the viewpoint of the International Electrotechnical Commission (IEC) standards and practices outside of North America.
Pierre Bertrand, Michael Mendik, Terence Hazel, Pascal Tantin   +3 more
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Fast and Reliable CT Saturation Detection Using a Combined Method

IEEE Transactions on Power Delivery, 2009
Busbar differential relays may operate incorrectly for external faults due to current-transformer (CT) saturation. In this paper, two different techniques are suggested to detect CT saturation. The first proposed technique is based on the fact that the waveshape of the CT secondary current changes significantly at the instant of the saturation.
H. Dashti, M.S. Pasand, M. Davarpanah
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An Impedance-Based CT Saturation Detection Algorithm for Bus-Bar Differential Protection

IEEE Power Engineering Review, 2001
This paper presents an algorithm for CT saturation detection based on the measurement of the power system source impedance seen from the relay location. The algorithm estimates this source impedance using a short-data window impedance-estimation algorithm.
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A busbar differential protection relay immune to the effects of CT saturation

Eighth IEE International Conference on Developments in Power System Protection, 2004
This paper describes a busbar differential protection relay operating in conjunction with a current transformer (CT) saturation detection algorithm. The detection algorithm detects the start and end of each saturation period based on the third-difference function of the current.
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The research of the sampling method for CT saturation for numerical busbar protection

Eighth IEE International Conference on Developments in Power System Protection, 2004
The busbar protection is the most important relays in plants and substations of power system. It has direct effect on the security and stability for an electric power system. The busbar protection has thus a maximum degree of security against spurious operation for external short-circuits.
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Risk Analysis of CT Saturation Caused by Aperiodic Components

2022 IEEE International Conference on Electrical Engineering, Big Data and Algorithms (EEBDA), 2022
Zhang Guoxin, Wang Ganlin, Liu Hongshun, Yu Dayang, Wang Qilin, Chen Long   +5 more
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Determination of Critical Gas Saturation by Micro-CT

Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description, 2020
Steffen Berg, Ying Gao, Apostolos Georgiadis, Niels Brussee, Ab Coorn, Hilbert Van der Linde, Jesse Dietderich, Faruk Omer Alpak, Daniel Eriksen, Miranda Mooijer-van den Heuvel, Jeff Southwick, Matthias Appel, Ove Bjørn Wilson   +12 more
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