Distance Relaying of Asymmetrical Double-Circuit Transmission Lines Considering Abnormal Faults

Distance relays undergo significant imprecision in measuring the accurate fault impedance in the case of asymmetrical double-circuit transmission lines (DCTLs). The research in the literature lacks dealing with the protection of asymmetrical DCTLs either through the distance relaying or other altern...

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Bibliographic Details
Published in:Iranian journal of science and technology. Transactions of electrical engineering 2023-06, Vol.47 (2), p.563-599
Main Author: Abdollahzadeh, Hamed
Format: Article
Language:English
Subjects:
Asymmetry
Circuits
Data processing
Double circuit
Electrical Engineering
Engineering
Fault location
Faults
Relaying
Research Paper
Time domain analysis
Transmission lines
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Summary:Distance relays undergo significant imprecision in measuring the accurate fault impedance in the case of asymmetrical double-circuit transmission lines (DCTLs). The research in the literature lacks dealing with the protection of asymmetrical DCTLs either through the distance relaying or other alternative approaches. Abnormal faults, such as inter-circuit and cross-country faults, are the other concerns of DCTLs, leading to serious malfunctions of the distance relays. Taking account of different types of faults including the abnormal ones, this paper proposes a functional approach for the distance relaying of asymmetrical DCTLs in the case where both the line circuits are in service. This is fulfilled through the fault-branch currents innovatively derived from the line six-phase circuit model analysis on a time-domain basis. The currents derived lead to the mathematical equations with linear combinations of designated functions, providing a splendid opportunity to design an adaptive linear combiners (ADALINE) corresponding to each fault type. Being given the line one-end measurements as the input, the ADALINE with its simple architecture and operating principle would return a fast and accurate online estimation of the fault distances as the output. The estimated fault distances are employed for the distance protection along with the fault location, without any post-fault data processing being needed for the latter function. Extensive simulation studies in PSCAD/EMTDC would reveal that the proposed approach would effectively fulfill the distance relaying of asymmetrical DCTLs and remedy the serious deficiencies of the conventional relays in facing high-resistance and abnormal faults.
ISSN:2228-6179
2364-1827
DOI:10.1007/s40998-022-00563-9