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Prediction of PDIV in motor coils using finite element method | IEEE Conference Publication | IEEE Xplore

Prediction of PDIV in motor coils using finite element method


Abstract:

The aim of this paper is the presentation of a method allowing the prediction, at the design phase, of the Partial Discharges Inception Voltage (PDIV) in motor coils made...Show More

Abstract:

The aim of this paper is the presentation of a method allowing the prediction, at the design phase, of the Partial Discharges Inception Voltage (PDIV) in motor coils made with classical enameled wire. The method is based on the comparison of electrical potential values - obtain with a Finite Element simulation - with those given by the Paschen's laws for the same inter-electrode gap. The originality of the study is the consideration of the real length of the electric field lines to compute the gap between the electrodes. With this prediction, it is possible to improve the capabilities of the Electrical Insulation System (EIS) of motors built in large series.
Date of Conference: 03-07 July 2016
Date Added to IEEE Xplore: 23 August 2016
ISBN Information:
Conference Location: Montpellier, France
Citations are not available for this document.

I. Introduction

Last few years have seen the development of more and more electric vehicles. The embedded power growth lead to use the electrical activators with very strong environmental or electrical constraints. For example, with more than 1.4MW of embedded power, the Dreamliner is the most electric aircraft for the moment and many systems are targeted to produce a new generation of planes like braking, de-icing systems, taxiing, passenger equipment, air conditioning and pressuring. These embedded systems have to deal with the weight of the copper conductors, and thus, the trend tries to increase the value of the supply voltage much higher than usual voltage. Moreover, the enameled wires technology uses a classical combination of PolyAmide-Imide (PAI) and PolyEster-Imide (PEI) - whose thicknesses are defined in an international standard [1] - designed for industrial voltages operating points. In addition, PWM converters currently feed the motors without any filter due to weight considerations. In these conditions, the steep voltage edges imposed to the system made of the motor and the connection cable causes a voltage peak that may exceed the PDIV in the motor insulation system [2]. When they appear, partial discharges (PD) cause very fast ageing of polymer insulating layers leading to a short life expectancy for standard motors fed by these systems [3], [4]. The variable operating conditions of the embedded systems can lead to unconventional values of the PDIV. Indeed, the conditions of appearance of partial discharges are intrinsically linked to pressure, temperature or humidity. So, it is necessary to calculate a relevant value of this threshold very early during the design of the motor to adjust its EIS. The method used in this study suggests to compute the distribution of the electric field in a motor coil to compare the results with those calculated with the Paschen's theory. Previous works using this method compute straight field lines between the conductors [5]. This can be done however only with simple geometries. The originality of the proposed method is the computation of the electric field line length to improve the accuracy of the results. That also makes it possible the computation of more complex problems and more complex geometries. In a first part, the method is detailed and validated with the suitable assumptions. Then, the use of the method in the domain of the coil insulation is explained. Geometrical and environmental considerations are taken into account to refine the results quality. In the third part, the method is implemented for the determination of a twisted pair PDIV. The last part discusses the results and the ways of improvement for the study.

Cites in Papers - |

Cites in Papers - IEEE (9)

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1.
M. Gómez de La Calle, Y.V. Cleaz, A. Gómez, G. Robles, J.M. Martínez-Tarifa, "Temperature effect on conservative PDIV prediction models based on Paschen’s Law", 2022 IEEE 4th International Conference on Dielectrics (ICD), pp.336-339, 2022.
2.
Y. Kemari, C. Van de Steen, G. Belijar, L. Laudebat, S. Diaham, Z. Valdez-Nava, C. Abadie, "A Townsend’s secondary ionization coefficient estimation method for partial discharge inception voltage prediction for insulating polymers", 2022 IEEE 4th International Conference on Dielectrics (ICD), pp.226-229, 2022.
3.
Manuel Gómez De La Calle, Juan Manuel Martínez-Tarifa, Ángel Manuel Gómez Solanilla, Guillermo Robles, "Uncertainty Sources in the Estimation of the Partial Discharge Inception Voltage in Turn-to-Turn Insulation Systems", IEEE Access, vol.8, pp.157510-157519, 2020.
4.
THéo Mathurin, Stephane Duchesne, Guillaume Parent, "Assessment of Finite Element Simulation Methodologies for the Use of Paschen’s Law in the Prediction of Partial Discharge Risk in Electrical Windings", IEEE Access, vol.8, pp.144557-144564, 2020.
5.
Daniel Roger, Sonia Ait-Amar, Ewa Napieralska-Juszczak, Piotr Napieralski, "Proposition for Improving the Design of Motor Windings for Low-Pressure Environment", IEEE Transactions on Industry Applications, vol.56, no.3, pp.2491-2499, 2020.
6.
Bertrand Revol, Stephane Azzopardi, Toni Youssef, Jean Sylvio Ngoua Teu, Cyrille Gautier, Rabih Khazaka, Sara Roggia, "Overview and new trends in technology bricks for reliability enhancement in future wide band gap power converters for More Electrical Aircraft (MEA) and More Electrical Propulsion (MEP) systems", IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, vol.1, pp.7128-7134, 2019.
7.
Avo Reinap, Akanksha Upadhyay, "Specification of a Specimen for Accelerated Thermal Aging Tests", 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED), pp.49-55, 2019.
8.
Philippe Collin, David Malec, Yvan Lefevre, "About the relevance of using Paschen's criterion for partial discharges inception voltage (PDIV) estimation when designing the electrical insulation system of inverter fed motors", 2019 IEEE Electrical Insulation Conference (EIC), pp.513-516, 2019.
9.
Daniel Roger, Mathieu Rossi, "Over-voltage distribution between turns of the transformer coils of large SST cells", 2019 IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG), pp.1-6, 2019.

Cites in Papers - Other Publishers (2)

1.
Leire Elorza Azpiazu, Gaizka Almandoz, Aritz Egea, Gaizka Ugalde, Xabier Badiola, "Study of Partial Discharge Inception Voltage in Inverter Fed Electric Motor Insulation Systems", Applied Sciences, vol.13, no.4, pp.2417, 2023.
2.
Patrick Xie, Gaurang Vakil, Chris Gerada, "Electric drive systems with long feeder cables", IET Electric Power Applications, vol.14, no.1, pp.16-30, 2020.
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