Condition assessment of stator insulation during drying, wetting and electrical ageing

Fernando, M. A. R. M.; Naranpanawa, W. M. L. B.; Rathnayake, Hansika; Jayantha, G. A.

doi:10.1109/tdei.2013.6678856

Cited by 31 publications

(13 citation statements)

References 16 publications

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“…An increase of PD activity and treeing effect are likely to be observed. Insulation resistance (IR) and polarization index (PI) are probably the most widely used diagnostic test in order to detect contamination and moisture problems on machine windings [18].…”

Section: Multistress Insulation Aging Factorsmentioning

confidence: 99%

Multistress Characterization of Fault Mechanisms in Aerospace Electric Actuators

Barater

Immovilli

Soldati

et al. 2017

IEEE Trans. on Ind. Applicat.

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Abstract1 -The concept behind the More Electric Aircraft (MEA) is the progressive electrification of on-board actuators and services. It is a way to reduce or eliminate the dependence on hydraulic, mechanical and the bleed air/pneumatic systems and pursue efficiency, reliability and maintainability. This paper presents a specialised test rig whose main objective is to assess insulation lifespan modelling under various stress conditions, especially investigating the interaction between ageing factors. The test set-up is able to reproduce a multitude of environmental and operational conditions at which electric drives and motors, used in aerospace applications, are subjected. It is thus possible to tailor the test cycle in order to mimic the working cycle of an electrical motor during real operation in aircraft application. The developed test-rig is aimed at projecting the technology readiness to higher levels of maturity, in the context of electrical motors and drives for aerospace applications. Its other objective is to validate and support the development of a comprehensive insulation degradation model.

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Section: Multistress Insulation Aging Factorsmentioning

confidence: 99%

Multistress Characterization of Fault Mechanisms in Aerospace Electric Actuators

Barater

Immovilli

Soldati

et al. 2017

IEEE Trans. on Ind. Applicat.

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“…Some types of insulations react dramatically and large changes can be appeared in their physical parameters [45,46]. Drying insulation during temperature increase and then preparing a high or medium temperature can prevent adverse effects in insulation and the machine windings.…”

Section: Influence Of Humidity Variationmentioning

confidence: 99%

Influence of ambient and test conditions on insulation resistance/polarization index in hv electrical machines - a survey

Torkaman

Karimi

2015

IEEE Trans. Dielect. Electr. Insul.

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Ambient and test conditions can affect the analysis results of the insulation system testing in high voltage (HV) electrical machines. In this context, insulation resistance (IR) and polarization index (PI) are two common techniques for winding insulation assessment in offline mode. This paper investigates the influence of main parameters that affects IR/PI tests results. Temperature, humidity, and pressure are the wellknown environmental parameters which could affect dielectric parameters of insulation such as IR and PI. On the other side, test voltage level and voltage polarities connections are two prominent factors in sampling the resistance during the test. Moreover, the insulation resistance value depends on the type of fault and its severity. The variations of insulation resistance with considering the mentioned parameters are evaluated in this paper, to study the possible correlation between IR/PI and changes in other parameters. It was found that with taking the effective parameters into account, the accurate and reliable insulation test interpretation can be achieved in HV electrical machines. A comprehensive review of literature was done and industry experts were surveyed for their ideas and experience under a research project. The main results are summarized in this paper.

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“…• measurement of the insulation resistance between windings and ground (R I ) and calculation of the polarisation (PI) and absorption (AI) indexes [2,3]; • measurement of the dissipation (DF) and tip-up factors (DF TU ) of the insulation [4][5][6][7];…”

Section: Introductionmentioning

confidence: 99%

“…omeasurement of the capacitance (C I ) and tip-up capacitance (C TU ) of the insulation [5,8,9]; • high-voltage test (hipot) with alternated (AC) and direct current (DC) [10,11]; • surge test [12].…”

Section: Introductionmentioning

confidence: 99%

Insulation failures prognosis in electric machines: preventive detection and time to failure forecast

Guedes¹,

Silva²

2020

IET Electric Power Applications

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This work presents a new approach to the on-line evaluation of the insulation of electric machines. Through the proposed system, it is possible to identify the stress agents causing the degradation of the insulation of low-and mediumvoltage machines. In addition, the estimation of the time-to-failure (TF) of the insulation is developed based on linear stochastic models autoregressive moving average and artificial neural networks. The identification of the stress agent and the estimation of the TF give a complete prognosis for the predictive monitoring of the machine insulation.

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Condition assessment of stator insulation during drying, wetting and electrical ageing

Cited by 31 publications

References 16 publications

Multistress Characterization of Fault Mechanisms in Aerospace Electric Actuators

Multistress Characterization of Fault Mechanisms in Aerospace Electric Actuators

Influence of ambient and test conditions on insulation resistance/polarization index in hv electrical machines - a survey

Insulation failures prognosis in electric machines: preventive detection and time to failure forecast

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