Fuzzy adaptive transmission line differential protection with improved stabilization for near-by transformer inrush cases

Rebizant, W.; Solak, Krzysztof; Klimek, A.

doi:10.1109/ptc.2011.6019178

Cited by 1 publication

(2 citation statements)

References 6 publications

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“…Furthermore, adjusting the characteristics curve of the relay with a triple slope will be accompanied by low reliability in case of external faults with CT saturation. 5 In Dashti and Sanaye-Pasand, 6 an adaptive differential protection scheme was proposed with multiple functional zones to protect power transformers. Relay operating areas are set based on the current trajectory and fault status.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

“…However, the performance of the proposed design during CT saturation and inrush current has not been discussed. Furthermore, adjusting the characteristics curve of the relay with a triple slope will be accompanied by low reliability in case of external faults with CT saturation 5 …”

Section: Introductionmentioning

confidence: 99%