Current Transformer Model

Guerra, Fd.C.F.; Mota, W.S.

doi:10.1109/tpwrd.2006.887092

Cited by 53 publications

(21 citation statements)

References 21 publications

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“…Under the condition of harmonic, the stray and coupling capacitance of each part cannot be ignored .The Equivalent circuit model can be established [3]: In which, V Th is Equivalent source, The parameters of this model can consult reference [4] and [5].…”

Section: B Analysis Of Cvt Harmonic Measurement Errormentioning

confidence: 99%

Research on the Measurement error of Electric Energy Metering System under Harmonics

Yang¹,

Jian²,

Liu³

et al. 2015

Proceedings of the International Conference on Computer Information Systems and Industrial Applications

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Electric energy metering system consists of watt-hour meter, voltage transformer and current transformer. Hence, the error of electric energy metering system should be analyzed from the three parts. Aiming at the measurement accuracy of the power metering system under harmonics, the equivalent circuits of electronic watt-hour meter, capacitive voltage transformer and magnetic current transformer under harmonic conditions are built, and the harmonic measurement/metering error and the influencing factors are analyzed. The model of electric energy metering system is set up to analyze its error under harmonic conditions. This article provides a theoretical basis for the quantitative analysis of measurement error of the energy metering system under harmonics.

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Section: B Analysis Of Cvt Harmonic Measurement Errormentioning

confidence: 99%

Research on the Measurement error of Electric Energy Metering System under Harmonics

Yang¹,

Jian²,

Liu³

et al. 2015

Proceedings of the International Conference on Computer Information Systems and Industrial Applications

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show abstract

“…If magnetizing current can be determined, then correct primary current can be estimated. The CT modeling technique proposed in [3] and [11] is used to estimate the magnetizing current in the modeled CT. The estimated magnetizing current is then added to the measured secondary current and the result is an estimate of the correct secondary current.…”

Section: F Compensating Algorithmmentioning

confidence: 99%

“…In all considered test cases, the fault current waveforms, representing various fault conditions in terms of fault current magnitude, flux remnant, burden, time constant, and fault inception angle are obtained from EMTP simulations based on realistic subtransmission network parameters. The CT modeling based on [3], [11], and [21] and compensation algorithms are implemented in the MATLAB platform. The CT model used in this study is shown in Fig.…”

Section: Performance Evaluationmentioning

confidence: 99%

“…As a result, they are prone to saturation. Many studies on the analysis of steady-state and transient behavior of iron-cored CTs have been reported in the literature [1]- [5], [7], [11]. Several methods to compensate distortions of the CT secondary current have been presented in the literature [1]- [4], [11], [12], [14]- [18].…”

Section: Introductionmentioning

confidence: 99%

“…A new CT model is presented in [11], which includes the representation of the magnetic hysteresis and the dynamic losses in the core. The results are compared with those of the Preisach's model.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

ANFIS-Based Compensation Algorithm for Current-Transformer Saturation Effects

Erenturk

2009

IEEE Trans. Power Delivery

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This paper proposes an efficient compensation algorithm based on an adaptive network-based fuzzy inference system capable of converting a sampled current waveform that is distorted by current-transformer (CT) saturation to a compensated current waveform. Quick response time, no cumulative estimation error, desired sample-by-sample output, no dependency of CT parameters/characteristics and secondary burdens, and simplicity are some attractive features of the proposed method. The accuracy and robustness of the introduced compensation algorithm are demonstrated through extensive test cases reflecting a wide range of variations in fault conditions and CT parameters. The proposed algorithm has also been implemented and tested on a digital signal processor board.Index Terms-Adaptive network-based fuzzy inference system (ANFIS), compensation, current transformers (CTs), saturable cores.

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Analysis of Distance Protection’s Operation in Cases of Deep Saturation of Current Transformers

Osintsev

Naumova

Gracheva

2021

Lecture Notes in Civil Engineering

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There is usually no information about permissible error of current transformers in modes succeed by large relative short-circuit current, at which microprocessor-based protections operate stably. By this reason, it is necessary to use data, defined for analog relays. It leads to value appreciation of a project because it is often essential to reduce current transformers' error in case of a short circuit fault. Therefore, it is necessary to define the value of current transformers' error, permitted for impedance relays. Conclusions of fundamental and applied sciences (mathematical analysis, theoretical foundations of electrical engineering, theory of simulation), analytical methods of researching nonlinear circuits and digital signal processing were used. A simulation model was created for setting overall tests of the current trans-former (CT) system. It was a relay protection device that reflected all the important properties of studied objects and allowed an analysis of digital distance protection's operation at high levels of short-circuit currents. The factors influ-encing over digital distance protection's operation in case of deep saturation of CTs were revealed, and a certain algorithm for definition of the permissible CT errors was proposed. Stable operation of digital distance protection was observed in case of a fault nearby the place of current transformers' setting in all theoretically possible combinations of electrical system's power and length of a protected electric power transmission line. It is valid if electric load choice is carried with account for stable protection's operation in condition of a fault in the computational point and if voltage swell in secondary wirings is infeasible.

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Current Transformer Model

Cited by 53 publications

References 21 publications

Research on the Measurement error of Electric Energy Metering System under Harmonics

Research on the Measurement error of Electric Energy Metering System under Harmonics

ANFIS-Based Compensation Algorithm for Current-Transformer Saturation Effects

Analysis of Distance Protection’s Operation in Cases of Deep Saturation of Current Transformers

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