The ability of diagnostic tests to estimate the remaining life of stator insulation

Stone, G.C.; Sedding, H.G.; Lloyd, B.A.; Gupta, B. K.

doi:10.1109/60.9359

Cited by 79 publications

(27 citation statements)

References 10 publications

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“…The identical changes in extracted parameters like 'L MA , L MB , and LR' further suggests that the deformation in the shape of extended parks current elliptic pattern increases with the change in an eccentricity (ε) from '0.2905' viz., close to zero (0) to '0.9411' viz., close to one (1).…”

Section: A Healthy State Of Insulation In 'Phase-b' and 'Phase-c' Wimentioning

confidence: 99%

“…In the previous investigations it is ascertained that there is no correlation between the results of any nondestructive type of (dc/ac) assessment parameters with destructive type of (dc/ac/impulse) breakdown levels [1]. There is a need to establish an economical nondestructive test method for an assessment of state of degradation of stator groundwall insulation caused due to various factors in an integrated way.…”

Section: Background Of Present Research Workmentioning

confidence: 99%

Section: Background Of Present Research Workmentioning

confidence: 99%

“…Both the type of test measures are as such relatively insensitive life indicators of stator winding insulation, which still have significant remaining life [1].…”

mentioning

confidence: 99%

“…Further, both the dc and ac type of nondestructive tests are useful to assess the remaining life of stator winding insulation when it is on the verge of failure. Both the type of test measures are as such relatively insensitive life indicators of stator winding insulation, which still have significant remaining life [1].More or less the credibility in estimating the insulation condition under nondestructive tests must be correlated with the results of destructive tests [2], [3]. In the previous investigations it is ascertained that there is no correlation between the results of any nondestructive type of (dc/ac) assessment parameters with destructive type of (dc/ac/impulse) breakdown levels [1].…”

mentioning

confidence: 99%

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Performance Evaluation of Computer Simulated Extracted Features of Induction Motor with Healthy State of Insulation Present in Any Two-Phases

Modak¹,

Inamdar²

2012

IJCEE

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Abstract-The state of degradation of stator groundwall insulation in induction motor results in the state of unbalance in three-phase stator current at fundamental frequency. In this investigation, the computer simulation model to determine this state of unbalance is developed. The practical assumption of stator winding of induction motor being star (Υ) connected with isolated neutral is considered.On the basis of park's transformation model the stator current data in three-phase machine variable ('abc') form is first transformed into equivalent two-phase ('dq') form. The graphical dq-data pattern form is realized and certain mathematical parameters are extracted. The extracted features of induction motor for particular case of variation in the state of degradation of stator winding insulation are presented. The performance evaluation of the same is done. On the basis of performance evaluation, it is possible to determine the appropriate selection of specific input parameter conditions for optimal design of suitable artificial neural network classifier. Index Terms-Computer simulation, induction motor, insulation degradation, park's current transformation, stator groundwall insulation I. BACKGROUND OF PRESENT RESEARCH WORKThe state of stator winding insulation of induction motor is affected by the combination of thermal, mechanical and environmental stresses. The diagnostic tests and measurements to assess the condition of stator winding insulation in a particular machine are mainly classified in two broad categories viz., destructive tests and nondestructive tests. The destructive tests are the effective means to provide the direct measure of the status of insulation system. Another Manuscript received November 22, 2011; revised February 29, 2012. The work presented in the research paper is part of Ph. D. research work of first author. The associated Ph. D. research work is in progress and registered by the first author under the guidance of second author at Shivaji University, Kolhapur, Maharashtra, India, since January 2008. The overall work is associated with the application of artificial intelligence (AI) based tool like artificial neural network (ANN) for the detection of state of unbalance of three-phase stator current data of three-phase induction motor used in continuous process industry. The application is in context to state of degradation of stator winding insulation of the respective phases. The present research paper only describes the modeling and simulation part of the state of degradation of stator winding insulation of three-phase induction motor under test.Amit J. more subjective means of assessing the insulation condition requires the dissection and examination of some sample of insulation. Both the above methods damage the winding and in turn make the machine unserviceable. The dc type of nondestructive test parameters are sensitive to dampness and contamination of a winding but are insensitive to the presence of voids and delamination. The dc type of nondestructive tests are useful to deter...

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Section: A Healthy State Of Insulation In 'Phase-b' and 'Phase-c' Wimentioning

confidence: 99%

Section: Background Of Present Research Workmentioning

confidence: 99%

Section: Background Of Present Research Workmentioning

confidence: 99%

“…Both the type of test measures are as such relatively insensitive life indicators of stator winding insulation, which still have significant remaining life [1].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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