Implementation of Rogowski Coil Based Differential Protection on Electric Arc Furnace Transformers of Mobarakeh Steel Company: Design Step

Ghanbari, Teymoor; Samet, Haidar; Jarrahi, Mohammad Amin; Daryabar, Darioush

doi:10.1109/eeeic.2018.8493988

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Electronic transformers are widely used in electrical power systems, especially the electronic current transformer based on Rogowski coil and the electronic voltage transformer based on capacitive voltage divider [1][2][3][4][5][6][7][8][9]. Since the output signals of Rogowski coil and capacitive voltage divider are proportional to the rate of change of the primary signals, they are required to recover the measured primary signals, which is usually realized by electronic integrator circuits [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An improved distance relay based on electronic transformer by using instantaneous value after equal transfer processes

Wen

Shi³

et al. 2022

IET Generation Trans & Dist

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This paper analyses the formation mechanism of the transmission distortion of electronic voltage transformer, and points out that the integrator will magnify the transient transfer error and superimpose the dynamic additional component on the output signal, which may cause the transfer distortion of voltage signal in serious cases. To restrict the electronic transformer transient variable error effect on distance relay, a distance relay method using instantaneous value after equal transfer processes is proposed. It directly uses output differential signals of the capacitor voltage divider and Rogowski coil. The capacitor voltage divider and Rogowski coil are decomposed into several typical variable link in series. The virtual digital transfer link, which is constructed by the digital filter, is used to compensate for the difference parts of the transfer link, so that the voltage and current signals pass through the same transfer link. It can mitigate the influence of voltage and current signal transfer difference on the calculation accuracy of distance relay. The simulation results show that the proposed distance relay method has fast operation speed and is less affected by abnormal voltage and current signal transfer, and its performance is better than existing distance relay methods.

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Section: Introductionmentioning

confidence: 99%

An improved distance relay based on electronic transformer by using instantaneous value after equal transfer processes

Wen

Shi³

et al. 2022

IET Generation Trans & Dist

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“…To address the second challenge, the protection algorithm should be updated based on the tap changing procedure [11]. Finally, the third challenge can be rectified by using Rogowski coils (RCs) instead of conventional CTs [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, we have chosen the PCBRC as the current sensor in this project. In our previous report in [16], design consideration and feasibility of the usage of PCBRCs have been briefly described. In this paper, we have manufactured the PCBRCs and tested them in a real experiment in the MSC.…”

Section: Introductionmentioning

confidence: 99%

Designing and manufacturing of electric arc furnace currents measurement system in Mobarakeh Steel Company by printed circuit board‐type Rogowski coils

Sadeghi

Samet

Ghanbari

et al. 2022

IET Science Measure & Tech

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This paper deals with the utilization of printed circuit board Rogowski coils (PCBRCs) for differential protection of electric arc furnace (EAF) transformers in Mobarakeh Steel Company (MSC), Isfahan, Iran. Because of a high level of current (in the range of 100 kA) in the EAF transformers in the MSC, employment of differential protection is quite challenging. Conventional current transformers (CTs) cannot offer reliable performance for very high current levels. The PCBRCs are a branch of Rogowski coils (RCs) that can be manufactured with high precision using computer-aided design approaches and have the capability for the measurement of very large currents. In this study, we have designed and manufactured two sets of PCBRCs to measure current in the primary and secondary sides of the EAF's transformers in the MSC. The PCBRCs are followed by a signal condition circuit (SCC) which includes a low-pass filter, amplifier, and voltage-to-current (V-to-I) converter block. Thanks to the SCC, the high current of the transformers can be properly sensed and transmitted over a long cable that connects the PCBRCs to the relay. Furthermore, a novel model is suggested for the EAF that includes characteristics of both time and frequency domain models. The suggested model is developed using a large number of recorded data from the MSC and can model the non-linear and time-variant behaviours of the EAF. The proposed PCBRCs, SCC, and EAF modelling are evaluated by some simulations and experiments in the MSC.

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Optimal Placement and Sizing of Fault Current Limiters in Power Systems with Uncertainties

Jarrahi

Mohammadi

Samet

2019

2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Syst

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Implementation of Rogowski Coil Based Differential Protection on Electric Arc Furnace Transformers of Mobarakeh Steel Company: Design Step

Cited by 6 publications

References 21 publications

An improved distance relay based on electronic transformer by using instantaneous value after equal transfer processes

An improved distance relay based on electronic transformer by using instantaneous value after equal transfer processes

Designing and manufacturing of electric arc furnace currents measurement system in Mobarakeh Steel Company by printed circuit board‐type Rogowski coils

Optimal Placement and Sizing of Fault Current Limiters in Power Systems with Uncertainties

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