This paper presents a fast and accurate fault classifier for three-terminal transmission circuits. Traditional phasor-based methods fail to meet the high speed requirements of modern power grids and necessitate alternative solutions. The transient-based schemes use advanced signal processing techniques to achieve fast and accurate fault classification. As the three-terminal lines experience very pronounced transients during faults, the proposed method makes use of the fault-generated transients to quickly and correctly classify the fault. Many transient-based schemes fail to give the required accuracy since the transient patterns with relay-measured signals are highly influenced by fault conditions. Therefore, a thorough analysis of transient patterns is carried out in this paper, and based on the typical patterns revealed by the analysis of fault-generated transients an effective classification algorithm is developed. For high-speed classification, only a quarter-cycle of postfault voltage signals measured at the relay points will be processed for feature extraction using wavelet transform. The algorithm includes a hybrid procedure based on a probabilistic neural network for tackling the effects of fault inception angle and fault resistance in transient variations. Particularly, it is designed to overcome the problem with double-line-to-ground fault classification. The technique is simple and extensive simulation studies and comparison substantiate the efficacy of the proposed method under different fault conditions.
Three-terminal lines, fault classification, transients, wavelet transform, probabilistic neural network
BHUPATIRAJU, RAVI KUMAR VARMA; DHANIKONDA, VENKATA SESHA SAMBA SIVA SARMA; and PULIPAKA, VENKATA RAMANA RAO
"Transient- and probabilistic neural network-based fault classification in EHV three-terminal lines,"
Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 26:
2, Article 28.
Available at: https://journals.tubitak.gov.tr/elektrik/vol26/iss2/28