A New Current-Based Technique for Discrimination between Internal Faults and Inrush Current within Power Transformers
MetadataShow full item record
Inrush current may lead to a false operation of the power transformer differential protection relay. Hence, it is very essential to distinguish inrush current from various internal transformer faults in order to improve the reliability of the differential protection scheme. This paper presents a new current-based technique to discriminate transformer inrush current from transformer internal faults. The proposed technique relies on converting the three phase transformer currents in both sides into modal current components using Clarke's transformation to produce three current modes namely, ground mode, areal mode 1 and areal mode 2. The features extracted from the three modes are then applied to the inrush discrimination equation proposed in this paper. The robustness of the proposed technique is evaluated through extensive simulation studies on a 132/15 kV, 155MVA power transformer using electromagnetic transient program (EMTP-ATP). Simulation results show the effectiveness of the new proposed technique in discriminating magnetizing inrush current from other transformer internal faults.
Showing items related by title, author, creator and subject.
Application of a Recursive Phasor Estimation Method for Adaptive Fault Component Based Differential Protection of Power TransformersAshrafian, A.; Mirsalim, M.; Masoum, Mohammad Sherkat (2017)© 2016 IEEE. An adaptive differential protection method is proposed for power transformers. First, the phasors of captured current signals are computed using an online recursive S-transform-based method of phasor estimation ...
Multi fault diagnosis based on loading matrix and score matrix of principal component analysis for a centrifugal pumpKamiel, B.; Howard, Ian (2014)Centrifugal pumps are one of the rotating machines that are widely used in various industries such as oil and gas, petrochemical, water treatment, power generation, agriculture, and fertilizers. During its operation, it ...
Finite-Element Performance Evaluation of On-Line Transformer Internal Fault Detection Based on Instantaneous Voltage and Current MeasurementsMasoum, A.; Hashemnia, Seyednaser; Abu-Siada, Ahmed; Masoum, Mohammad Sherkat; Islam, Syed (2014)This paper investigates the performance of a recently proposed online transformer internal fault detection technique through detailed non-linear three-dimensional finite element modelling of the windings, magnetic core ...