Contribution of Electrical–Thermal Aging to Slot Partial Discharge Properties of HV Motor Windings

Kang, Ailiang; Tian, Mingliang; Song, Jiancheng; Lin, Lingyan; Li, Wei; Lei, Zhipeng

doi:10.1007/s42835-018-00076-8

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…Accordingly, the surface potential is easily developed on the insulation layer by the impulse voltage with fast rise times, and partial discharge (PD) occurs between the stator core and motor windings and even penetrates the main insulation of EVs motor. 9,10) Insulating paper is used between stator windings and motor core, which can reduce the incidence of insulation failure in EV slot. Figure 3 shows that the Aramid paper is used as slot insulation material in EVs motor due to its good electrical properties, high heat resistance and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Electrical aging characteristics of Aramid paper under nanosecond impulse and AC voltages for the stator slot of electric vehicle motors

Zhang¹,

Chen²,

Matsumoto³

et al. 2022

Jpn. J. Appl. Phys.

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The electric vehicles (EVs) have been helping to alleviate the pressure of the world energy crisis. However, the insulation of EVs driving motors usually suffers from the electrical stress caused by partial discharge (PD) during the operation. Aramid paper in the stator can reduce the incidence of electrical degradation. In this context, PD characteristics, topography and chemical groups changes of Aramid paper under AC and repetitive nanosecond impulse voltages were compared. The results illustrated that the increase of ambient temperature will promote the activity of PD under AC voltage. The PD magnitude under nanosecond impulse voltage is almost 100-fold that under AC voltage. PD caused by nanosecond impulse voltage leads to more severe destroy of chemical groups and higher roughness. This investigation offers an important reference for exploring the electrical aging of Aramid paper for the slot of stator in EVs motor.

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Section: Introductionmentioning

confidence: 99%

Electrical aging characteristics of Aramid paper under nanosecond impulse and AC voltages for the stator slot of electric vehicle motors

Zhang¹,

Chen²,

Matsumoto³

et al. 2022

Jpn. J. Appl. Phys.

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show abstract

“…Among them, the key project in offshore platform construction, namely welding technology, has also developed rapidly, and new welding technologies have gradually emerged. Although traditional welding methods, such as submerged arc welding (SAW) have high welding efficiency, they also have high energy consumption, serious pollution and poor working environment [1,2]. In addition, SAW usually adopts double-sided welding and requires turning plate treatment, which is not conducive to the welding of large flat plate components.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Heat-Affected Zone in Submerged Arc Welding and Laser Hybrid Welding of 690 MPa High Strength Steel and its Relationship with Ductile–Brittle Transition Temperature

Wang

Xie

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The comparative study of submerged arc welding (SAW) and laser hybrid welding (LHW) was carried out for a 690 MPa high strength steel with thickness of 20 mm. Microstructure and ductile-brittle transition temperature (DBTT) evolution in welded zone were elucidated from the aspect of crystallographic structure, particularly, digitization and visualization of 24 variants. The impact toughness of each micro zone in LHW joint is better than that of SAW, in which the DBTT of equivalent fusion line and heat-affected zone (HAZ) can reach − 70 and − 80 °C, while that of SAW is only − 50 °C. LHW technology induces narrowing of the HAZ and refining of the microstructure obtained in weld metal and HAZ. Meanwhile, the austenite grain size and transformation driving force in the coarse grained heat-affected zone (CGHAZ) are reduced and increased, respectively. It makes variant selection mechanism occurring in CGHAZ of LHW dominate by close-packed plane grouping, which promotes lath bainite formation with high density of high angle grain boundary, especially block boundary dominated by V1/V2 pair. While for SAW, the lower transformation driving force inferred from the large amount of retained austenite in CGHAZ induces Bain grouping of variants, and thus triggers the brittle crack propagating straightly in granular bainite, resulting in lower impact toughness and higher DBTT.

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Effect of Temperature on PD Characteristics Under Nanosecond Pulses

Zhang

Chang

Feng

et al. 2023

Springer Proceedings in Physics

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Contribution of Electrical–Thermal Aging to Slot Partial Discharge Properties of HV Motor Windings

Cited by 6 publications

References 13 publications

Electrical aging characteristics of Aramid paper under nanosecond impulse and AC voltages for the stator slot of electric vehicle motors

Electrical aging characteristics of Aramid paper under nanosecond impulse and AC voltages for the stator slot of electric vehicle motors

Microstructure Evolution of Heat-Affected Zone in Submerged Arc Welding and Laser Hybrid Welding of 690 MPa High Strength Steel and its Relationship with Ductile–Brittle Transition Temperature

Effect of Temperature on PD Characteristics Under Nanosecond Pulses

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