Over-current relay implementation assuring fast and secure operation in transient conditions

Lotfifard, Saeed; Faiz, Jawad; Kezunovic, Mladen

doi:10.1016/j.epsr.2012.02.001

Cited by 12 publications

(9 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3] OCRs are sequentially placed as main-backup pairs (MBPs) to protect the system against probable overcurrents. [1][2][3] OCRs are sequentially placed as main-backup pairs (MBPs) to protect the system against probable overcurrents.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10] Communication-assisted protection is more efficient compared to noncommunication-assisted methods, [11][12][13] especially for grids with distributed generations (DGs). 2,[17][18][19] Although the recognition of inrush currents enhances the overcurrent protection performance, the relatively long processing time 2 and the essential high-processing ability decrease the practical applications of inrush/transient overcurrent recognition. 9,11,14,15 Therefore, communication-assisted protection systems are expensive for utility owners, and it seems to be a long-term solution for future smart grids.…”

Section: Introductionmentioning

confidence: 99%

“…Overcurrent relays (OCRs) and fuses are the most economical and widely used protective devices in distribution systems. [1][2][3] OCRs are sequentially placed as main-backup pairs (MBPs) to protect the system against probable overcurrents. It is preferable to increase the sensitivity of OCRs without missing their selectivity for reducing the ; S f , safety factor for compensation of the measurement errors; S L f , safety factor for backup TCCs; S R f , safety factor for main TCCs; TCC L (I), lowered TCC of backup OCRs; TCC R (I), raised TCC of main OCPDs; TSM Temp , natural-valued variable for determination of the actual TSM; X m , thermal increment of OCRs; Z, objective function of the optimization problem Abbreviations: DG, distributed generation; DT, discrimination time; FCL, fault current limiter; FPA, flower pollination algorithm; GA, genetic algorithm; IM, induction motor; MBP, main-backup pair; MMT, minimum melting time; MPSO, modified particle swarm optimization; OCR, overcurrent relay; OCPD, overcurrent protection device; TCC, time-current curve; TD, time dial; TCT, total clearing time; TSM, time-setting multiplier negative effects of overcurrents.…”

Section: Introductionmentioning

confidence: 99%

“…The following practices are conventionally used for time-current graded coordination of overcurrent protection devices (OCPDs). (i) The pickup currents (I P ) of OCRs are selected considerably larger than the highest load current 2,[4][5][6] to guarantee the selectivity. However, that reduces the sensitivity of the protection systems.…”

Section: Introductionmentioning

confidence: 99%

“…• The recognition of inrush or transient overcurrents benefits the OCPDs by preventing them from operation during transient overcurrents. Therefore, shorter DTs can be considered for the time-current graded coordination of the OCDPs, 2,6,16 resulting in enhancement of the overall performance of the overcurrent protection scheme. Several signal processing-based methods are suggested in the prior literature to distinguish between a transient overcurrent from a fault or permanent overcurrent.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Optimal time‐current graded coordination of multistage inverse‐time overcurrent relays in distribution networks

Hamidi

Ahmadian

Patil

et al. 2019

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

Summary This paper proposes a method for optimal coordination of multistage overcurrent relays (OCRs) in radial distribution networks, including industrial, rural, and urban grids. The proposed method optimally coordinates multistage time‐current curves (TCCs) using the genetic algorithm (GA). The proposed method is able to determine the proper TCC type (eg, moderately inverse, very inverse, and extremely inverse), pickup current, and time‐setting multiplier (TSM) for each stage of TCCs. The proposed method utilizes the dynamic models of OCRs and fuses. This safeguards the relays against the maloperations resulting from the DC decaying part of fault currents and transient overcurrents caused by transformer energization or motor starting. The proposed method is evaluated using DIgSILENT Power Factory for power system analysis and Matlab for implementation of the proposed method. According to the simulation outcomes, the advantages and disadvantages of the proposed method are discussed and compared with the existing methods.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimal time‐current graded coordination of multistage inverse‐time overcurrent relays in distribution networks

Hamidi

Ahmadian

Patil

et al. 2019

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

Fault Location: The Models, Methods, and Solutions

Kezunovic

Dokic

Esmaeilian³

et al. 2022

Wiley Encyclopedia of Electrical and Electronics Engineering

View full text Add to dashboard Cite

Determining fault location in power systems using the available measurements and models is an important task since it allows the maintenance crews to inspect the site where the fault may have occurred, inspect the equipment, make repairs, and allow the operators to restore the service. Our article examines the fault‐location background, offers an overview of the basics of fault‐location algorithms, and surveys approaches to determining transmission line model parameters first. We cover the fault‐location methods based on the measurements of the waveforms reflecting electromagnetic transients, phasors, and electromechanical transients. We finally discuss the algorithms based on a combination of physics‐ and data‐based methods used for determining fault location in distribution systems and reflect on the algorithms for predicting faults in both transmission and distribution systems. We summarize the state of the art and critical implementation issues at the end followed by a comprehensive set of references.

show abstract

Protection and Monitoring of Digital Energy Systems Operation

Hamidi

Bhadra

2023

Power Systems

View full text Add to dashboard Cite

Over-current relay implementation assuring fast and secure operation in transient conditions

Cited by 12 publications

References 22 publications

Optimal time‐current graded coordination of multistage inverse‐time overcurrent relays in distribution networks

Optimal time‐current graded coordination of multistage inverse‐time overcurrent relays in distribution networks

Fault Location: The Models, Methods, and Solutions

Protection and Monitoring of Digital Energy Systems Operation

Contact Info

Product

Resources

About