Review: Methods for relay coordination

Walke, Shubhangi B.; Jangle, Nayana N.

doi:10.1109/iccmc.2017.8282625

Cited by 5 publications

(5 citation statements)

References 21 publications

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“…For the topology shown in Figure 17, considering the direction of power flows, the OCRs responsible for protection of the system are given as MBPs in Table 12. OCRs 6,7,18,19,21,and 22 are corresponding to the open circuit breakers as tie switches. OCRs 2,5,10,12,14,17,20,23,25,and 27 are blocked by the directional relays, and they are not considered in protection coordination.…”

Section: Test Casementioning

confidence: 99%

See 1 more Smart Citation

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

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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.

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Section: Test Casementioning

confidence: 99%

“…OCRs 2,5,10,12,14,17,20,23,25,and 27 are blocked by the directional relays, and they are not considered in protection coordination. OCRs 6,7,18,19,21,and 22 are corresponding to the open circuit breakers as tie switches. OCRs 3,4,15,16,and 24 are already set based on the end loads.…”

Section: Test Casementioning

confidence: 99%

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

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“…Protective relays are the most important means to meet the aforementioned requirements [3]. The purpose of the protective relay is to de-energize the faulted part of the distribution power system and prevent the rest of the system from being affected in the event of an abnormal condition or fault, such as a short circuit [4]. To prevent the aforementioned events and their influence on consumers, the relays are set in coordination with each other.…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

A Comprehensive Assessment of Fundamental Overcurrent Relay Operation Optimization Function and Its Constraints

Rojnić

Prenc

Bulat³

et al. 2022

Energies

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The optimization of overcurrent relays’ operation is a topic associated with protection coordination of distribution networks. Usually, this refers to medium-voltage networks, since they are protected by numerical relay devices, as opposed to low-voltage networks, where utility operators allocate fuses. Correct setting of relays and optimal coordination is becoming a serious challenge to Distribution Network Operators around the world, since their networks’ passive operation has been greatly altered in the past two decades. Distributed generation units, a growing liberalized electricity market and more stringent legislation for distribution network planning and operation by state regulatory bodies have all indirectly affected the evolving of protection philosophy for distribution networks. In this paper the traditional optimization problem of overcurrent relay operation will be addressed and critically examined from both a theoretical and practical point of view. Optimization function, constraints and relay parameters will all be observed and compared with solutions used in distribution networks, and their modifications and improvements will be proposed and elaborated in detail.

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“…In [12][13][14][15], the threshold setting of OCRs is only valid for typical DG capacities. In [16], the authors have introduced a hybrid PSO-based protection coordination method to adjust TDS parameters of directional overcurrent relays. The paper [17] proposed an optimization function to calculate tripping and pick-up thresholds of OCRs in a range of pre-defined values.…”

Section: Introduction 1motivation and Assumptionmentioning

confidence: 99%

An Adaptive and Scalable Protection Coordination System of Overcurrent Relays in Distributed-Generator-Integrated Distribution Networks

Bùi

Nguyễn

et al. 2021

Applied Sciences

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Integration of distributed generators (DGs) into a distribution network (DN) can cause coordination challenges of overcurrent relays (OCRs) because of different fault-current contributions of DGs as well as the directional change in fault currents. Therefore, the OCRs should be properly coordinated to maintain their adaptability and scalability to protect the DG-integrated distribution network. In this study, an adaptive and scalable protection coordination (ASPC) approach has been developed for the OCRs in a DG-contained distribution network based on two implementation stages. At the first stage, the reliability improvement of fault-current calculation results is performed by determining the min-max confidence interval of fault current for each different fault type, which is the basis for properly selecting tripping and pick-up thresholds of definite-time and inverse-time OC functions in the same OCR. At the second stage, optimization algorithms are used for calculating protection-curve coefficients and Time-Dial Setting (TDS) multiplier for the inverse-time OC functions in the OCR. A real 22 kV DG-integrated distribution network which is simulated by ETAP software is considered a reliable test-bed to validate the proposed ASPC system of OCRs in the multiple-DG-contained distribution network. In addition, the coordination results of OCRs can be obtained by three common optimization algorithms, Particle Swarm Optimization (PSO), Gravitational Search Algorithm (GSA), and Genetic Algorithm (GA). These relay coordination results have shown an effective protection combination of the definite-time OC functions (50P and 50G) and the inverse-time OC functions (51P and 51G) in the same OCR to get the adaptable and scalable DN protection system.

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Review: Methods for relay coordination

Cited by 5 publications

References 21 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

A Comprehensive Assessment of Fundamental Overcurrent Relay Operation Optimization Function and Its Constraints

An Adaptive and Scalable Protection Coordination System of Overcurrent Relays in Distributed-Generator-Integrated Distribution Networks

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