Performance Improvement of Transformer Differential Protection During Cross-Country Fault Using Hyperbolic S-Transform

Shahbazi, Nassim; Bagheri, Sajad; Gharehpetian, Gevork B.

doi:10.1109/tim.2021.3128691

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…CCFs usually occur at two different positions or phases of a circuit, and simultaneously or with a short time delay. Detection of such faults by differential protection is difficult and is one of the problems of protection engineers today 10,31,32 . CCFs discussed in this study include the most complex and worst types of internal and external electrical and mechanical faults modeled with the time delay among them.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Detection of such faults by differential protection is difficult and is one of the problems of protection engineers today. 10,31,32 CCFs discussed in this study include the most complex and worst types of internal and external electrical and mechanical faults modeled with the time delay among them. Figure 11 presents a schematic of CCF.…”

Section: Modeling Of Ccfsmentioning

confidence: 99%

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Transformer differential protection scheme based on self‐adaptive biased characteristic curve and considering cross‐country faults

Shahbazi

Bagheri

Gharehpetian

2022

Circuit Theory & Apps

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The differential protection of transformers sometimes does not have reliable performance facing some faults and events such as saturation of current transformers (CTs) during internal and external faults, inrush currents, and crosscountry faults (CCFs). In this paper, a new transformer differential protection scheme based on the self-adaptive biased characteristic curve and considering CCFs and various disturbances are used. First, the maximum overlap discrete wavelet transform (MODWT) was used to extract the superior characteristics of sampled differential current of the transformer at different levels. Then, by calculating the duty cycle (D) values of energy coefficients extracted in each periodicity by MATLAB software, a new self-adaptive biased characteristic curve will be obtained in different operating conditions. Finally, the percentage differential protection operation is adjusted based on the new adaptive characteristic curve zones. Differential current sampling under different operating conditions was performed on a real three-phase transformer in EMTP software. The simulation results show that the proposed adaptive differential protection scheme can accurately detect various faults and events occurring in the transformer and increase system reliability.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Modeling Of Ccfsmentioning

confidence: 99%

Transformer differential protection scheme based on self‐adaptive biased characteristic curve and considering cross‐country faults

Shahbazi

Bagheri

Gharehpetian

2022

Circuit Theory & Apps

Self Cite

View full text Add to dashboard Cite

show abstract

“…Further, ST was utilized in [94] for the protection of the distribution feeder. A hyperbolic ST is implemented in [95] for transformer differential protection against cross-country faults which are the faults that occur at two different locations within the same circuitry. Moreover, a power calculation approach for nonstationary signals has been presented in [96] using ST and current's physical components power theory.…”

Section: Miscellaneous Applications Of Standard and Modified Stsmentioning

confidence: 99%

A Comprehensive Overview on Modified Versions of Stockwell Transform For Power Quality Monitoring

Kumar¹,

Saxena²,

Kumar

et al. 2022

IEEE Access

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The increasing trends toward the accurate identification of power quality disturbances (PQD) via power quality (PQ) monitoring require an appropriate digital signal processing (DSP) technique and a robust classifier. To this end, Stockwell transform (ST), one of the most efficient feature extraction DSP tools, and its several variants play an utmost role in PQ assessment framework. Its time-varying spectral characteristics generally extract the local instantaneous frequency spectrum from the global temporary behavior of PQD signal. However, the Standard ST suffers from thepoor time-frequency resolution because of its frequency-dependent Gaussian window (GW). While the analysis of the statistically time-varying signals requires a suitable balance between time and frequency resolution. To this end, this paper provides a comprehensive literature review on several modified versions of Standard ST for the first time to reduce the computational complexity of the algorithm as well as maximize the energy concentration of the timefrequency plane. A comparative analysis of all the modified STs has been presented in tabular form to provide the key characteristics of each technique. Additionally, a case study has been presented to substantiate the highest accuracy of the proposed algorithm over the other ST variants. Apart from the PQD classification, miscellaneous applications of Standard ST and its modified variants have been indicated. This review paper may provide a valuable resource to the researchers for further improvement of the timefrequency resolution of ST not only in classifying PQD but also for its other wide applications.INDEX TERMSEnergy concentration, power quality monitoring, power quality disturbance, Stockwell transform, time-frequency analysis.

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Countermeasures for reduction of screen currents due to cross country faults in MV cable distribution networks

Cerretti¹,

D'Orazio²,

Gatta³

et al. 2023

Electric Power Systems Research

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Performance Improvement of Transformer Differential Protection During Cross-Country Fault Using Hyperbolic S-Transform

Cited by 11 publications

References 28 publications

Transformer differential protection scheme based on self‐adaptive biased characteristic curve and considering cross‐country faults

Transformer differential protection scheme based on self‐adaptive biased characteristic curve and considering cross‐country faults

A Comprehensive Overview on Modified Versions of Stockwell Transform For Power Quality Monitoring

Countermeasures for reduction of screen currents due to cross country faults in MV cable distribution networks

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