MADHUCHHANDA MITRA

Applied Physics

S SENGUPTA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Power Systems

This study deals with inter-turn short-circuit assessment of DC traction motors used in railway locomotives. This has been done by analysing input current spectra of rectifier unit feeding the traction motor. The analysis includes multi-resolution analysis and discrete wavelet transform (DWT) of current spectra to calculate approximate and detailed coefficients and then to evaluate the skewness, kurtosis and root mean square values. Variation of those values with respect to percentage of inter-turn short circuit at different DWT decomposition levels has been observed. A number of curves have been chosen for fault assessment based on the observations. Deviations from normal condition have also been observed by logic matrix. Depending on the features obtained, normal and different percentages of short in the traction motor windings have been classified and an algorithm has been proposed accordingly. Case study has been carried out on Indian WAP4 locomotive, wherein the input current to the rectifiers has been analysed and efficacy of the proposed algorithm has been validated. If for the locomotives, these parameters are monitored, percentage of inter-turn short circuit in the winding may be assessed far before massive system degradation occurs. © The Institution of Engineering and Technology 2018.

IET Electric Power Applications

Inter-turn short-circuit assessment of DC motor used in railway locomotive

This paper deals with the identification of a faulty load bus, in a multi-bus power system, monitoring the inter-harmonic and sub-synchronous inter-harmonic operating point in P-δ plane, depending on passivity model based Gauss-Seidal iteration technique. In this analysis, real power, load angle and bus voltage have been calculated and the shifting of the various operating points in the inter-harmonic and sub-synchronous inter-harmonic P-δ curves have been assessed, for different feeders. The technique has been implemented in IEEE 30 bus system. Considerable change has been seen for fundamental and sub-synchronous inter-harmonic operating points in P-δ plane. © 2016 IEEE.

2016 2nd International Conference on Control, Instrumentation, Energy and Communication, CIEC 2016

Identification of faulty load bus in a multi-bus power system

This paper presents an approach for detection of Current Transformer (CT) saturation and assessment of Root Mean Square (RMS) value of primary current during saturation by Multi Resolution Analysis (MRA). This has been achieved by capturing voltage across secondary of CT and decomposing it by Discrete Wavelet Transform (DWT) for different primary currents. MRA is performed on secondary voltage. MRA shows oscillatory notches during saturation; positive peak of the notch is measured wherefrom saturation is detected. Then wavelet decomposition is performed and RMS value of approximate coefficients is measured for different primary currents. Then interpolation and extrapolation methods are applied for assessment of RMS value of primary current during saturation. Simulated results show very optimistic result in assessment of primary current at saturation. © 2016 IEEE.

Assessment of saturated current transformer primary current by multi resolution analysis of its secondary current

In this paper steady state harmonic stability has been assessed in IEEE 14 bus system for fault at generator bus. It has been achieved by applying passivity based impedance model in Gauss-Seidal iteration technique. Power and load angle have been determined at normal condition as well during fault condition at generator bus. Fundamental and harmonic bus voltages have been determined both for normal and fault conditions. Operating points in P-δ plane have been identified and zone of operation has been assessed for both fundamental and harmonic components. Significant shift of the harmonic operating points have been observed during fault condition.

IET Conference Publications

Steady state harmonic stability analysis in IEEE 14 bus system for fault at generator bus

Harmonics free system voltage or currents form a closed loop in voltage-voltage or current-current plane. In this loop cleavages appear with the presence of harmonics, order of which is directly proportional to number of cleavages. Reactive and active power of the system are related with the area in v-i and vi-t planes covered by the curves consisting of fundamental waveform along with harmonic components, wherefrom, active power and reactive power distortion factors have been measured to assess power quality in a three-phase power system. Park transformation technique has been used for power distortion factor measurement, which has reduced the computational effort to a great extent. © 2014 Elsevier Ltd. All rights reserved.

Measurement: Journal of the International Measurement Confederation

Harmonic power distortion measurement in Park Plane

This paper presents a computer aided novel technique for electric power quality assessment. This has been done by assessment of unbalance and presence of harmonics in a power system. This is achieved by developing some feature patterns formed by power system data, wherefrom rule set has been generated to analyze unbalance and presence of harmonics in a power system. The study of the unbalance is accomplished in voltage-voltage plane, whereas the study on harmonics is done in Clarke and Park domain using Clarke and Park Transformation matrices.

Journal	Power Systems
Publisher	-
ISSN	1612-1287
Open Access	No