On-line capacitance and dissipation factor monitoring of AC stator insulation

Younsi, Karim; Neti, Prabhakar; Shah, M.R.; Zhou, Jian; Krahn, John; Weeber, K.; Whitefield, C. David

doi:10.1109/tdei.2010.5595545

Cited by 85 publications

(41 citation statements)

References 8 publications

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“…This can be related to an Equivalent Series Resistance (ESR) representing losses in a non-ideal capacitor. Dissipation factor is used to indicate the quality of a capacitors but has also found an important role in assessing the health of insulation/dielectric materials [16], [17].…”

Section: ) Dissipation Factor Dfmentioning

confidence: 99%

An applied laboratory characterisation approach for electric machine insulation

Kavanagh

Howey

McCulloch

2013

2013 9th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED)

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Insulation is a fundamental part of electric machines as it provides suitable electrical isolation between the different parts and sub-components. Developing techniques for analysing properties of insulation is extremely useful for the assessment of operating conditions, insulation quality and degradation (state of health). This paper investigates a novel non-invasive experimental approach to characterise phase-to-phase and phaseto-ground insulation by measuring electrical impedance and derived parameters (capacitance, dissipation factor) over a wide frequency range (100 to 2 MHz) at various different temperatures. Due to its simplicity the method lends itself better to an electrostatics interpretation compared with the typical twisted pair approach. Analysis is presented for the method which show its effectiveness under different operating conditions. This work has important applications in the area of condition monitoring of insulation using impedance based measurements.

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Section: ) Dissipation Factor Dfmentioning

confidence: 99%

An applied laboratory characterisation approach for electric machine insulation

Kavanagh

Howey

McCulloch

2013

2013 9th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED)

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“…Using measured insulation leakage current during a motor's operation, indicators of ground-wall insulation health such as C & DF are derived. The technique to calculate C & DF in an online fashion has been discussed [8][9][10]. Motor endwinding contamination leads to insulation surface tracking that subsequently causes field enhancement in the end-winding region of the motor [7].…”

Section: Online Monitoring Of Motor Endwinding Contaminationmentioning

confidence: 99%

“…Therefore, prevention of such outages is highly preferred by both manufacturer and the end user. Recently, a high sensitivity differential current transformer (HSCT) has been developed for online monitoring the health of ground-wall insulation through capacitance (C) and dissipation factor (DF) measurements [8][9][10]. This is a major breakthrough in the arena of insulation health monitoring that can allow the recording of C and DF of motor insulation continuously during motor operation as opposed to an offline C & DF bridge test.…”

Section: Introductionmentioning

confidence: 99%

Online detection of endwinding contamination in industrial motors

Neti

Zhang

et al. 2011

2011 Electrical Insulation Conference (EIC).

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This paper discusses a novel online technique to detect moisture and surface tracking of stator end-winding insulation in medium/high voltage AC motors. A novel high sensitivity differential current transformer is used as a sensor for monitoring insulation capacitance and dissipation factor of motors online. A 100 hp, 4160V, 3-phase form-wound induction motor is tested with different contaminants sprayed on its end winding. Partial discharge couplers are also used to monitor partial discharge activity during insulation contamination tests. A comparison of both techniques to detect pre-cursors of motor failure due to end-winding tracking is presented in this paper.

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“…In [21] a significant resin weight loss was observed around the winding in a failed induction motor. Additionally, it was found in [22] that after the initial ageing cycles, there was a shift of the dissipation factor and the capacitance at all voltage levels towards lower losses and capacitances because of the drying out and post curing of the insulation.…”

Section: Introductionmentioning

confidence: 99%

The impact of thermal degradation on electrical machine winding insulation

Sumisławska

Gyftakis

Kavanagh

et al. 2015

2015 IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)

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. (2015) 'The impact of thermal degradation on electrical machine winding insulation' in IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (pp: 232-238 Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders. CURVE is the Institutional Repository for Coventry University

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On-line capacitance and dissipation factor monitoring of AC stator insulation

Cited by 85 publications

References 8 publications

An applied laboratory characterisation approach for electric machine insulation

An applied laboratory characterisation approach for electric machine insulation

Online detection of endwinding contamination in industrial motors

The impact of thermal degradation on electrical machine winding insulation

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