Results 251 to 260 of about 1,138,456 (310)

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Detection of Saturation and Reconstruction of the Secondary Current of a CT

International Journal of Emerging Electric Power Systems, 2010
During a short circuit condition, core of a Current Transformer (CT) may become saturated due to large primary current containing a significant DC component. The saturation of the core distorts the secondary current which may cause malfunction of the protective devices connected to the CT.
Ganesh Balu Kumbhar, Satish M Mahajan
openaire   +1 more source

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
openaire   +1 more source

Compensation of the distortion in the secondary current caused by saturation and remanence in a CT

IEEE Power Engineering Society General Meeting, 2004., 2004
Current-transformer (CT) saturation may cause the maloperation of a protection relay. This is particularly onerous when the remanent flux in the core of the CT adds to the flux change caused by the fault. The CT is forced into deep saturation and the waveshape of the secondary current is severely distorted.
Y.C. Kang, U.J. Lim, S.H. Kang, P.A. Crossley   +3 more
openaire   +1 more source

A CT Saturation Detection Algorithm Based on Wavelet Transformation

12th IET International Conference on Developments in Power System Protection (DPSP 2014), 2014
Current Transformer (CT) saturation may cause the maloperation or operating time delay of protective relays. In this paper, a CT saturation detection algorithm based on wavelet transformation is suggested. The WT (Wavelet Transformation) can be easily implemented with the multilevel filter banks.
null Sang-Hee Kang, null Min-Soo Kim, J.H. Shin, null Soon-Ryul Nam, null Jong-Jin Jung   +4 more
openaire   +1 more source

CT saturation effects on performance of digital overcurrent relays

2011 International Conference on Advanced Power System Automation and Protection, 2011
In general, modeling the behavior of the core in current transformers (CTs) used for protection and the effects of its operation outside the linear region are commonly reported in literature. The problem in using a mathematical TC model is to obtain the parameters in a particular case in order to implement that model easily, efficiently and accurately.
Aurelio Luiz Magalhaes Coelho, Paulo Marcio Silveira   +1 more
openaire   +1 more source

Phasor measurement and CT saturation compensation through embedding

2013 IEEE Power & Energy Society General Meeting, 2013
Phasor measurement measures the amplitude and phase angle of the signal to determine the health of the power system. If a fault occurs on a transmission line, the input current of a relay may contain harmonics and exponentially decaying DC offset. This paper proposes an embedding-based scheme, which transfers a power system signal to the phase space ...
T. Y. Ji, M. S. Li, Q. H. Wu
openaire   +1 more source

A discrete dynamic filter for detecting and compensating CT saturation

Electric Power Systems Research, 2007
Current transformers (CTs) are used in electric power systems for protection and measurement purposes. The current signals in the secondary side of a CT should be exact reproductions of the corresponding current signals on its primary side. CTs are susceptible to the saturation phenomenon which leads to inaccurate current measurement and therefore, may
K.M. El-Naggar, M.I. Gilany
openaire   +1 more source