Current Transformer Modeling for Electromagnetic Transient Simulation in Protection Systems

Afonso, José; Toscano, Pablo; Briozzo, Isabel

doi:10.1109/tdla47668.2020.9326170

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…Evaluasi eksperimental dari model CT diimplementasikan menggunakan EMTP, dimana model yang dikembangkan pada program EMTP memberikan hasil yang sangat memuaskan untuk sebagian besar kasus (Ahamed & Rao, 2015) (Syahputra, 2015). Salah satu perangkat lunak yang cukup populer dalam bidang sistem tenaga listrik adalah Electromagnetic Transients Program (ATP) yang merupakan versi dari EMTP adalah alat yang mampu digunakan untuk mengevaluasi unjuk kerja transformator arus (Afonso et al, 2020a) (Afonso et al, 2020b) (Georgiev et al, 2021).…”

Section: Pendahuluanunclassified

Studi Kejenuhan pada Current Transformer (CT) Akibat Arus Hubung Singkat

Setia,

Een Taryana,

Naufal Nur Aiman

et al. 2023

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Model pendekatan analisis saturasi CT dilakukan dengan menggunakan simulasi software ATPDraw dan Mathcad. Input data simulasi diperoleh dari pengujian CT pada GI Priok Barat yaitu rasio, kurva eksitasi V-rms-Irms, Rct. Berdasarkan hasil simulasi, bahwa model CT berhasil diimplementasikan terhadap kondisi CT di GI Priok Barat yang mengalami kejenuhan, terlihat dari hasil bentuk gelombang yang mengalami distorsi dan nilai THDi sebesar 40,612%. Hasil ini selanjutnya dibandingkan dengan standar IEC 61869-2 dengan parameter yang didapat dari pengujian CT-Analyzer terhadap E-t, Ek, Ie, Kx, dan Rct, bahwa E-t sebesar -1%, Ek sebesar 635,25 V, Ie sebesar 13,5 mA, Kx sebesar 0,084 dan Rct 7432,57 ohm. Hasil ini mengalami penyimpangan dari standar yang ditentukan artinya CT tersebut mengalami kerusakan dan kejenuhan. Setelah dilakukan penggantian CT, diuji kembali dan didapatkan nilai E-t sebesar -0,010%, Ek sebesar 936,09 V, Ie sebesar 9,68 mA, Kx sebesar 14,39 A, Rct sebesar 4,226 ohm, serta hasil simulasi bentuk gelombang tidak mengalami distorsi, kemudian nilai THDi didapat sebesar 0,08%. Hal ini menunjukkan bahwa CT dalam keadaan baik dan tidak mengalami kejenuhan ketika nilai arus hubung singkat sebesar 20 kA.

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Section: Pendahuluanunclassified

Studi Kejenuhan pada Current Transformer (CT) Akibat Arus Hubung Singkat

Setia,

Een Taryana,

Naufal Nur Aiman

et al. 2023

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“…Calculations of the secondary current as a function of time at the short-circuit current in the primary circuit of the current transformer were performed using the field-circuit method with three-dimensional space-time analysis [30][31][32][33].…”

Section: Mathematical Model Of the Current Transformermentioning

confidence: 99%

“…Moreover, in the case of the accidental opening of the secondary terminals of the current transformer, a very high voltage would be induced in the secondary winding [19,20]. With the use of numerical methods [21][22][23][24][25][26][27][28] and space-time analysis of 3D electromagnetic fields, it is possible to check the operation of a short-circuit current transformer during short circuits before testing a prototype at the design change, i.e., the currents at an asymmetrical short circuit [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Operation of Cascade Current Transformers for Measurements of Short-Circuit Currents with a Non-Periodic Component with a Large Time Constant of Its Decay

Leśniewska

Olak

2022

Energies

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Simulations of emergency states and tests of resistance of electrical devices to emergencies are performed in specialized high-power laboratories, the so-called short-circuit laboratories. For most electrical power devices, such measurements are required by international standards. The basic equipment of short-circuit testing laboratories consists of current transformers for measuring short-circuit currents. These transformers should not only enable the accurate conversion of sinusoidal currents—which is typical for conventional current transformers, but also asymmetrical short-circuit currents containing an aperiodic component, which classic current transformers cannot reproduce. Therefore, manufacturers and designers try to meet the market demands and design these special class 0.2 current transformers. To meet the high technical requirements, the field-circuit method with three-dimensional space–time analysis of electromagnetic fields was used during design, considering physical phenomena in ferromagnetic cores (i.e., hysteresis and eddy current losses) and the load of the secondary winding of the current transformer by the measurement system. The article presents simulations of secondary currents for the short-circuit current transformer model, and the results were confirmed by measurements and oscillograms of the currents flowing in the windings of the real model. The prototype of the designed short-circuit transformer meets the IEC/EN standard requirements. When measuring harmonic currents, the transformation errors meet the requirements of class 0.2. During the short-circuit current waveforms, the maximum instantaneous peak error does not exceed 1% of the error for all the subsequent maxima of the current waveform during the specified transient switching cycle. In comparison, the standard allows this error to be 10%.

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“…For example, they are characterized vs. frequency and for power quality (PQ) applications in [ 8 , 9 ] and [ 10 , 11 ], respectively. Modeling is used in [ 12 ] for Rogowski coils, in [ 13 ] for an innovative current transformer (CT), and in [ 14 ] for legacy CTs. In [ 15 ], LPITs are characterized inside a realistic measurement chain containing phasor measurement units (PMUs).…”

Section: Introductionmentioning

confidence: 99%

Novel and Simplified Procedure to Test Immunity of Low-Power Voltage Transformers

Mingotti

Peretto

Tinarelli

2022

Sensors

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International technical committees put considerable efforts into the writing process of standards. They always try to find a tradeoff between the rigorous scientific requirements and the practical needs of manufacturers and final users. In addition, researchers keep investigating to improve the existing standards with new procedures, achievements, and findings. The purpose of this work is to contribute to that direction. It introduces a simplified and low-cost procedure to test low-power voltage transformers (LPVTs). The procedure is designed to assess the immunity of LPVTs when subjected to external electric fields. The need for this procedure comes from the existing immunity test, which is efficient but sometimes difficult to implement. The proposed one, instead, is simpler, cheaper, does not require the application of the rated voltage, and can be replicated at all voltage levels. In the paper, the procedure is described and demonstrated with experimental tests. From the results, it is possible to appreciate the validity of the proposed solution and the different ways it could be developed, implemented, and improved.

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Current Transformer Modeling for Electromagnetic Transient Simulation in Protection Systems

Cited by 4 publications

References 9 publications

Studi Kejenuhan pada Current Transformer (CT) Akibat Arus Hubung Singkat

Studi Kejenuhan pada Current Transformer (CT) Akibat Arus Hubung Singkat

Analysis of the Operation of Cascade Current Transformers for Measurements of Short-Circuit Currents with a Non-Periodic Component with a Large Time Constant of Its Decay

Novel and Simplified Procedure to Test Immunity of Low-Power Voltage Transformers

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