Method to secure the performance of the differential protection in presence of fault current limiter applied into the neutral line

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Summary In this paper, by decomposing high‐frequency band of differential current using wavelet transform and giving the extracted features to the empirical mode decomposition method, internal faults from magnetization conditions in power transformers are discriminated. The merit of the suggested method is validated by various simulation results using PSCAD and practical data set gathered from a laboratory 3‐phase transformer. Internal faults could be precisely discriminated from magnetizing current in half cycle of the fundamental frequency; this is one advantage of the method. Also, an innovative technique is suggested to tackle current transformer saturation negative impacts on differential relays. At end, the method is assessed and compared with some other well‐known discrimination methods by plenty of simulations and experiments.

Section: The Proposed Algorithmmentioning

confidence: 99%

Identifying internal fault from magnetizing conditions in power transformer using the cascaded implementation of wavelet transform and empirical mode decomposition

Sahebi

Samet

Ghanbari

2017

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“…On the other hand, in order to handle the increased fault current, protection equipment such as fuses and breakers should be replaced with higher rating equipment, which is a time consuming and expensive approach. Utilizing fault current limiters (FCLs) is one of the most attractive techniques to overcome these problems . During normal operation of power system, these facilities have negligible effect on the power system.…”

Section: Introductionmentioning

confidence: 99%

“…Utilizing fault current limiters (FCLs) is one of the most attractive techniques to overcome these problems. [8][9][10][11][12][13][14][15] During normal operation of power system, these facilities have negligible effect on the power system. However, they limit fault current through an impedance when a fault occurs.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of directional relay algorithms in presence of wind turbines and fault current limiters

Samet

Ghanbari

Ashtiani

et al. 2018

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Summary Connection of distributed generations (DGs) to distribution networks changes their radial construction to mesh type and increases fault current level. In order to prevent over current relay tripping in case of out‐of‐zone faults, direction of faults must be determined. On the other hand, fault current limiters (FCLs) are a suitable technique to reduce the issue of fault current increasing. In this paper, it is confirmed that operation of FCLs affects voltage and current signals, drastically. Since fault direction is detected by directional relays using these signals, hence, FCLs can affect the performance of the relays. In the other hand, if the added DG is a wind turbine, it may affect the directional relays performance due to intricate fault behavior of wind turbines. To investigate the mentioned hypothesis, some of directional relaying algorithms are evaluated in presence of wind turbine and FCL.

“…The analysis of the impacts of SFCL on the power system and vice versa, the impact of the power system parameters on SFCL performance are the important aspects of these evaluations. Albeit, it has been performed meritorious studies in both terms, [15][16][17][18][19][20][21][22][23] but in the second term, 1 of the fields that have been less considered in the previous studies is the effect of fault resistance and the position of fault on the fault current reduction ratio (FCRR) of SFCL. FCRR is defined as the ability of SFCL to limit the fault current.…”

Section: Introductionmentioning

confidence: 99%

Impact of fault resistance and fault distance on fault current reduction ratio of hybrid SFCL

Barzegar-Bafrooei

Foroud

2017

Summary Superconducting fault current limiters (SFCLs), as the novel power system devices, have attracted attentions in the last years. However, in order to achieve the maximum benefit from SFCLs, their interaction with power system should be comprehensively evaluated before equipping the power system with them. This paper investigates the effect of fault resistance and fault distance on the steady‐state fault current reduction ratio (FCRR) of hybrid SFCL. Based on the equivalent circuit model, analytical studies are presented to obtain the relation between 2 abovementioned factors and the FCRR of hybrid SFCL. Then, through the detailed simulation studies, the current limiting behavior of hybrid SFCL is evaluated when the value of fault resistance and the position of fault change in wide range. As a result, although the hybrid SFCL is able to reduce the fault current under different circumstances; however, FCRR significantly varies under outside the control changing circumstances. For far faults and faults with high fault resistance, the FCRR of hybrid SFCL is not as good as the other fault conditions. Hence, in the last section of the paper, the remedial actions to enhance the performance of hybrid SFCL during these conditions are proposed.