A New Restricted Earth Fault Relay Based on Artificial Intelligence

Ebadi, Ali; Hosseini, Mehdi; Abdoos, Ali Akbar

doi:10.5829/ije.2019.32.01a.08

Cited by 6 publications

(12 citation statements)

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“…By applying these settings, a strict evaluation of the proposed method performance is achieved. Then, the detection accuracy of the proposed method is evaluated for a wide range of internal and external fault events in comparison with the conventional method and an intelligent method [17]. It must be noted that two methods are simulated using MATLAB program but there is no interface between this program and PSCAD.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…To obtain a comprehensive and comparative assessment of the proposed method detection accuracy, its performance is evaluated for a wide range of internal and external faults in comparison with the conventional method [20] and the intelligent method [17]. To simulate internal fault events, voltage source is connected to the Y winding of power transformer under study and it supplies full-load power.…”

Section: A Comprehensive Comparative Accuracy Assessmentmentioning

confidence: 99%

“…The Krstivojevic and Djurić [15,16] proposed a new REF algorithm based on a time domain phase comparator that yields desirable results for inrush current condition and only single phase to ground type of external fault. Ebadi et al [17] have designed a new REF relay based on artificial intelligence which is slower than conventional method. They also employed time-frequency analysis to create an effective supervision method for conventional REF relays [18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Simple Method to Avoid Maloperation of Transformer Restricted Earth Fault Relay during External Fault Events

2021

IJE

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Section: Simulation Resultsmentioning

confidence: 99%

Section: A Comprehensive Comparative Accuracy Assessmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Simple Method to Avoid Maloperation of Transformer Restricted Earth Fault Relay during External Fault Events

2021

IJE

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“…As shown in Fig. 1, a part of a high voltage substation in Iran [21,22], including a power transformer, grounding transformer and CTs is modeled in PSCAD software. The specification of the power transformer and CTs are presented by Tables 1 and 2, respectively.…”

Section: Test Studymentioning

confidence: 99%

“…This model is based on the phenomenological model of a ferromagnetic core and the relationship between the magnetic moment and the intensity of the magnetic field. Currently used models, use mathematical techniques, which approximate the behavior of the hysteresis loop for recoil loops and renascence effects [22,23]. For many studies, these models are quite adequate except where accurate values of renascence are required following a circuit interruption with a subsequent reclose into a live circuit.…”

Section: Test Studymentioning

confidence: 99%

A Hybrid Intelligent Method for Compensation of Current Transformers Saturation Based on PSO-SVR

Gorji

Hosseini

Abdoos

et al. 2021

Period. Polytech. Elec. Eng. Comp. Sci.

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The Current Transformers (CT) saturation may cause the protective relays mal-operation either non-recognition of internal fault or undesirable trip under external fault conditions. Therefore, compensation of CT saturation is very important for correct performance of protective schemes. Compensation of CT saturation by combination of signal processing methods and intelligent algorithms is a suitable solution to solve the problem. It decreases the probability of mal-operation and increases the reliability of the power system. In this paper, Support Vector Regression (SVR) method is employed to compensate the distorted secondary current due to CT saturation. In SVR method, despite the other methods such as MLPand ANFIS, instead of minimizing the model error, the operational risk error is considered as target function. In this method, by using Kernel tricks, a smart RBF neural network is obtained, so that all operational procedures will be optimized automatically. In this paper, an intelligent method based on Particle Swarm Optimization (PSO) algorithm is presented to determine the optimal values of SVR parameters. Due to the stability and robustness of this method in presence of noise and sudden changes in current, this method has a high accuracy. In addition, a sample power system is simulated using PSCAD software. Afterwards, current signals are extracted and fed to PSO-SVR algorithm, which is implemented in MATLAB environment. The obtained results show the preference of the proposed method in aspect of estimation accuracy as compared to some presented methods in the field of CT saturation detection and correction.

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Presenting an Adaptive Restraint Method to Improve Performance of Ground Differential Protection of Power Transformer

Bkhaitawi

Abdoos

Ebadi

2022

IJE

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The ground differential (GD) relay is used to detect internal ground faults on the power transformer windings and terminals. In fact, this relay is employed as a complement to the phase differential (PD) relay. However, its stability is affected by magnetic saturation in current transformers (CTs) cores so that the spurious differential current caused by CT saturation may lead to the relay malfunction. In this paper, by modifying the restraining current definition in a conventional method, an adaptive restrain method is proposed. To evaluate the proposed method performance compared with conventional method, a real 230/63 kV power transformer under a large number of internal fault, external fault and in rush current cases are simulated in PSCAD/EMTDC environment. It is worth noting that Jiles-Atherton (JA) model is utilized to simulate CTs. MATLAB software is used to implement and analyze these methods using obtained simulation. Obtained results show that the proposed method is quite superior to the conventional method, despite its simplicity.

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A New Restricted Earth Fault Relay Based on Artificial Intelligence

Cited by 6 publications

References 0 publications

A New Simple Method to Avoid Maloperation of Transformer Restricted Earth Fault Relay during External Fault Events

A New Simple Method to Avoid Maloperation of Transformer Restricted Earth Fault Relay during External Fault Events

A Hybrid Intelligent Method for Compensation of Current Transformers Saturation Based on PSO-SVR

Presenting an Adaptive Restraint Method to Improve Performance of Ground Differential Protection of Power Transformer

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