Results 231 to 240 of about 114,627 (294)

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.
Fernández Martínez, Cesáreo
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Generator Protection and CT-Saturation Problems and Solutions

IEEE Transactions on Industry Applications, 2005
This paper presents a new generator relay design, stator differential function in particular, coping with extreme cases of current transformer (CT) saturation: both AC saturation under large currents and/or residual flux; and DC saturation under low currents but large and long lasting DC components.
B. Kasztenny, D. Finney
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A CT saturation detection algorithm

IEEE Transactions on Power Delivery, 2004
This paper proposes an algorithm for detecting current transformer (CT) saturation by analyzing a secondary current. The current has points of inflection where saturation begins and ends. Then, discontinuity in the first difference of the current arises at the next instants of points of inflection, where the second and third differences of the current ...
Y.C. Kang, S.H. Ok, S.H. Kang
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Performance evaluation of distance relay with CT saturation

Applied Soft Computing, 2011
The decision of digital distance relay is very important for making the protection scheme in the transmission system more reliable. As the current signal is taken from the output of the current transformer, the distortion introduced by the saturation in it affects the performance of the distance relay.
Soumya R. Mohanty, V. Ravikumar Pandi, Bijaya K. Panigrahi, Nand Kishor, Prakash K. Ray   +4 more
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CT saturation tolerance for 87L applications

2015 68th Annual Conference for Protective Relay Engineers, 2015
This paper is exploring requirements for the line current differential function (87L) with regards to the tolerance to current transformer (CT) saturation. Typically, requirements provided by the manufacturers or standards are to eliminate CT saturation completely by proper sizing of CTs, which is not always practical.
Zhihan Xu, Matt Proctor, Ilia Voloh, Mike Lara   +3 more
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CT saturation in industrial applications: analysis and application guidelines

IET 9th International Conference on Developments in Power Systems Protection (DPSP 2008), 2007
This paper analyzes the problem of protection class CTs in detail and explains its underlying mechanics. Several actual relays are analyzed in terms of their response to heavily saturated waveforms. A formal, compact and easy to grasp method is shown to present complex relations between the CT response and the response of any given relay. Based on this
B. Kasztenny, J. Mazereeuw, H. DoCarmo
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CT Saturation Detection and Compensation Algorithm

2020
This division presents a new Current Transformer (CT) saturation detection and compensation algorithm. The proposed algorithm depends on a saturation detection index (Dn) which is derived using derivatives of current signals and Newton’s backward difference formulas.
Dharmesh Patel, Nilesh Chothani
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A morphological scheme for the correction of CT saturation waveforms

2011 IEEE Power and Energy Society General Meeting, 2011
The saturation of a current transformer (CT) will cause severe distortion in the secondary current. Each fundamental cycle of the secondary current consists of two portions, the unsaturated portion and the saturation. This paper proposes a morphological scheme for the detection of the saturations and an embedding and optimization scheme for the removal
T. Y. Ji, Q. H. Wu, W. H. Tang, L. Jiang
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Algorithm for CT Saturation Detection with the Presence of Noise

2018 4th International Conference on Electrical Energy Systems (ICEES), 2018
Current transformer (CT) saturation may cause phase shift between unsaturated and saturated signal and thus results in distance relay overreach or underreach. During CT saturation, using the dynamic current phasor accurate saturation period can be estimated.
Sandeep Biswal, Monalisa Biswal
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A phasor estimation algorithm during CT saturation

2011 IEEE Trondheim PowerTech, 2011
This paper proposes a phasor estimation algorithm based on the least square curve fitting technique for the distorted secondary current due to CT saturation. In this paper, the mathematical form of the secondary current during CT saturation is represented as the scaled primary current with the magnetizing current.
null Dong-Gyu Lee, null Sung-Rok Yoo, null Sang-Hee Kang   +2 more
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