S. Abul Gafoor

Bio: S. Abul Gafoor is an academic researcher from Bapatla Engineering College. The author has contributed to research in topics: Fault (geology) & Wavelet transform. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.

A transient current based bus zone protection scheme using wavelet transform

Abstract: This paper deals with the application of wavelet transform for the detection of busbar faults and providing backup for external faults In the event of internal faults the transient behavior of feeder and zone-2 currents is opposite to that of zone-1 source current In the event of feeder or zone-2 faults, the corresponding currents exhibit similar transient behavior as that of source current The transients of these current signals are analyzed using wavelet based multi resolution analysis to obtain detailed coefficients over a narrow moving window The fault indexes of each current signal, defined based on these detailed coefficients, are utilized to detect the internal faults as well as external faults The scheme is tested for different types of internal and external faults with various incidence angles and fault impedance The proposed scheme discriminates internal faults from external faults even in the presence of current transformer saturation

A Fault Zone Identification Scheme for Busbar Using Correlation Coefficients Analysis

Abstract: This paper proposes a new busbar protection scheme based on the analysis of correlation coefficients between the current waveforms of all lines connected to the busbar. The cross-correlation coefficients between current waveforms of each line in moving windows are calculated in a phase segregate manner with respect to a reference line. It's performance has been evaluated by modelling an existing 400-kV Indian substation in PSCAD/EMTDC software package. The proposed scheme is able to provide ultra-high-speed protection for the bus faults. It's stability has been tested against a wide range of external faults. It also solves the problem of CT saturation which is the biggest challenge in conventional low-impedance busbar differential protection schemes (87B).

A New Differential Protection Scheme for Busbar using Teager Energy Operator

Abstract: This paper proposes a new instantaneous energy coefficients-based differential busbar protection scheme (namely, 87BT). The differential and restraining coefficients are calculated in a mode-segregated manner from the instantaneous phase current values. In order to evaluate its performance, an existing 400-kV substation with double-bus single breaker configuration has been modelled in PSCAD/EMTDC. The proposed scheme is able to provide high-speed protection for the bus faults. Moreover, it remains stable against external faults. A comparative evaluation with respect to 87B in case of CT saturation conditions has also been presented.

A New Differential Protection Scheme for Busbar Using d–q–0 Transformation

Abstract: This paper presents a new differential protection scheme for busbar using d–q–0 transformation. The proposed method is based on derivation of operating and restraining currents by utilizing...

Fault Discrimination Algorithm for Busbar Differential Protection Relaying Using Partial Operating Current Characteristics

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Application of Wavelet Transform for IEC-61850 based Busbar Protection

Abstract: A wavelet transform approach to IEC-61850 based busbar protection has been proposed in this paper. Initially, areal mode current travelling waves (TWs) are calculated using Karenbauer phase-modal transformation. Thereafter, the postfault initial travelling wavefronts in the form of wavelet transform modulus Maximas (WTMMs) have been extracted using level-1 detailed coefficients of Daubechies-1 wavelet. In order to evaluate performance of the proposed scheme, an existing 400-kV Indian substation with double-busbar arrangement has been developed. The results obtained from the proposed algorithm show its high responsiveness for bus faults and firmness against external faults. At the end, the feasibility of on-field implementation of the proposed scheme for IEC-61850 applications has been discussed.