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Estimation of the primary current in a saturated transformer
[1991] Proceedings of the 30th IEEE Conference on Decision and Control, 2002It is pointed out that, when a current in a power system is measured using a transformer, the measurement can be distorted by transformer saturation. The authors examine two methods of estimating the primary current from the secondary in the presence of saturation.
K.W. Chen, S.T. Glad
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Detection of Partial Saturation and Waveform Compensation of Current Transformers
IEEE Transactions on Power Delivery, 2015Derivative-based approaches have been widely used for detecting current-transformer (CT) saturation. This letter proposes an efficient approach for detecting CT saturation with a generic discrimination index without the need for setting definition. For this aim, the simultaneous samples-based multiplication of the secondary current by its derivative is
Esmail, E. +5 more
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Current Transformer Saturation Effects on Coordinating Time Interval
IEEE Transactions on Industry Applications, 2011The primary function of protective devices is to remove faulted equipment from the electrical system. It is typically very advantageous for these devices to isolate as small of a section of the electrical system as possible. Overcurrent protection is the most common protection function used, as faulted equipment typically results in a large short ...
Terrence Smith, Richard Hunt
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Current Transformer Burden and Saturation
IEEE Transactions on Industry Applications, 1979A tutorial review of the steady-state and transient behavior of current transformers used with power system relays and meters is presented. ANSI accuracy standards are discussed and consideration is given to the significance of burden and saturation in the application of protective relays.
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Study on Transient Saturation Characteristic of Current Transformer
2020 7th International Forum on Electrical Engineering and Automation (IFEEA), 2020Current transformer (CT) is an important measuring equipment to transfer the current signal from the primary side of the system to the secondary side. Most relay protection depends on the current signal transferred by CT. However, CT is prone to transient saturation due to the influence of the aperiodic component of the fault current. This paper deeply
Gao Qi, Huang Shaofeng
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Correction of Saturated Current Transformers Secondary Current Using ANNs
IEEE Transactions on Power Delivery, 2006Current transformers (CTs) provide instrument-level current signals to meters and protective relays. Protective relays' accuracy and performance are directly related to steady-state and transient performance of CTs. CT saturation could lead to protective relay maloperation or even prevent tripping.
H. Khorashadi-Zadeh, M. Sanaye-Pasand
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Statistical approach for evaluation of current transformer saturation
2018 Simposio Brasileiro de Sistemas Eletricos (SBSE), 2018Historically, power system protection schemes were performed by electromechanical relays and regime symmetrical component currents. Many modern digital relays have been installed in the last years, replacing old electromechanical solutions, but not accompanied by the current transformers (CT) substitution due to their long life span.
Eduardo Bortolin Argenton +2 more
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New method of detection of current transformer saturation
11th IET International Conference on Developments in Power Systems Protection (DPSP 2012), 2012A new method for detection occurrences of CT saturation is presented in this paper. The presented algorithm applies only first order derivatives of signals which is possible it has been designed in a new innovative methodology in which phase current signals are considered as coordinates of a 3D vector.
D.J. Bak +4 more
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A Scheme for Detection and Assessment of Current Transformer Saturation
2017 9th International Conference on Measuring Technology and Mechatronics Automation (ICMTMA), 2017Current transformer (CT) saturation may result in the distortion of CT secondary current, which will give rise to improper operation of relay protection devices in power system. In this paper, a novel scheme is proposed to detect CT saturation and assess the level of saturation.
Chen Hong +4 more
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Neural network for current transformer saturation correction
1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333), 1999Current transformer (CT) saturation can cause protective relay misoperation or even prevent tripping. This paper presents use of artificial neural networks (ANN) to correct CT secondary waveform distortions. The ANN is trained to achieve the inverse transfer function of iron-core toroidal current transformers which are widely used in protective systems.
D.C. Yu +5 more
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