Proposed is a method of diagnosis of crawling of an induction motor by stator current Concordia analysis. It has been done by assessing generated harmonics using stator current Concordia. Stator current of an induction motor has been captured, normalised and then Concordia has been formed in the Park plane. The presence of different harmonics has been assessed by a rule set based on the features extracted from the patterns developed by stator currents. Dominance of seventh harmonics is determined which is the main cause of crawling without using any filter or any Fourier or wavelet transform based technique. This method has been validated by a laboratory prototype. © 2012 The Institution of Engineering and Technology.

MADHUCHHANDA MITRA

Applied Physics

S CHATTOPADHYAY

S KARMAKAR

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

Electronics Letters

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.

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

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

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

Stator current of induction motor is analysed at single phasing by measuring phase angle, symmetrical components, Skewness, Kurtosis and harmonic distortion in Park plane. Diagnosis of single phasing of induction motor has been achieved by sequence components and stator current based pattern assessment. Distinct phase shift from 120° to 180° is observed between healthy phases. Patterns are formed using line currents and single phasing is assessed by using rule sets developed from features extracted from those patterns. Experimental result agrees with rule set and result obtained by assessment using sequence components. Then assessment is done by analysing wavelet decomposition based Skewness and Kurtosis of stator current in Park plane. At last, area based approach is used for assessment of single phasing and different distortion factors because of harmonics in Park plane are assessed. Accuracy increases with the increase of sampling rate of data acquisition system and use of Park plane has reduced computation effort by two-thirds. Thus single phasing is detected by sequence components supported by pattern formation and feature extraction and then harmonics during single phasing are assessed by wavelet decomposition and area-based approach in Park plane. © The Institution of Engineering and Technology 2014.

IET Electrical Systems in Transportation

Analysis of stator current of induction motor used in transport system at single phasing by measuring phase angle, symmetrical components, skewness, kurtosis and harmonic distortion in park plane

Journal	Electronics Letters
Publisher	INST ENGINEERING TECHNOLOGY-IET
ISSN	0013-5194
Open Access	No