Transformer power differential protection using real-time HIL test-based implementation of second-order transient-extracting transform

Hosseini-Biyouki, Mohammad Mahdi; Abyaneh, Hossein Askarian

doi:10.1016/j.ijepes.2021.107632

Cited by 6 publications

(1 citation statement)

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“…These features increase the computational complexity and reduce the accuracy of differential protection. Some algorithms identify the switching conditions based on the feature of the differential power signal [9]. Therefore, in these techniques, both voltage signals and current signals play an important role in causing additional cost and time requirements.…”

Section: Introductionmentioning

confidence: 99%

Efficient practical method for differential protection of power transformer in the presence of the fault current limiters

Sahebi

Abyaneh

Sadeghi

et al. 2023

IET Generation Trans & Dist

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The algorithms of the present generation of practical differential relays are based on two methods. The first method is based on the ratio of the harmonic content of the differential current, and the second one is based on the length of the time interval between the zero‐crossing points of the differential current, called the gap‐detection method. However, these methods suffer from the installation of the fault current limiters (FCLs) in the power system and current transformer (CT) saturation phenomenon. This paper deals with a simple practical method for differential relays to secure their performance. In the suggested method, a classifying algorithm is used to categorize the input signal of the relay and then the best method of the present generation of differential relays is employed. By this simple decision, the method takes the advantage of harmonic‐based and gap‐detection methods, while avoiding their drawbacks. To prove the robustness of the suggested method, a test bench with a resistive solid‐state fault current limiter (SSFCL) is implemented and examined in different situations. The results validate the consistency and the accuracy of the modified technique not only in the absence and the presence of the FCL but in the case of CT saturation.

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Section: Introductionmentioning

confidence: 99%