Surge Test-Based Identification of Stator Insulation Component With Partial Discharge Activity for Low Voltage AC Motors

Lee, Sang Bin; Naeini, Alireza; Jayaram, S.; Stone, G.C.; Šašić, M.

doi:10.1109/tia.2020.2976719

Cited by 23 publications

(11 citation statements)

References 23 publications

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“…In the context of investigations on LV machines, imitations of the insulation system in the form of wire pairs according to the standard IEC60851-5 [48], so-called motorettes/formettes (single-or three-phase) [90], [92], [119], [143]- [145] and rarely -due to the associated high costs -complete stators are used as test specimens [119], [146]- [148]. Many contributions concentrate on the component level of the materials used and other manufacturing parameters [44], [47], [91].…”

Section: E Measurement Test Setup and Specimenmentioning

confidence: 99%

The Insulation Resilience of Inverter-Fed Low Voltage Traction Machines: Review, Challenges, and Opportunities

2022

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The use of wide bandgap (WBG) semiconductor devices, which enable higher switching slew rates, and the increase in DC link voltage, which provides system-wide advantages, exposes the winding system of traction machines to enhanced electrical stress. The resulting nonlinear voltage distribution along the motor winding favors partial discharges (PD), which in low voltage (LV) machines causes excessive damage to the insulation system, and premature failure can occur. A simple solution by increasing the enamel thickness of the wires leads on the one hand to a lower copper fill factor. On the other hand, this measure is not necessarily accompanied by an increase in electrical resilience in the case of pulsed voltage. It is therefore essential to understand the phenomenon of partial discharges, which is composed of a large number of processes and mechanisms, to be able to make an estimation of aging. The ultimate goal is to derive a lifetime model that links the dynamic load collectives -ideally in conjunction with the environmental stress influences -of a traction application to a usage-dependent and realistic prediction of the residual lifetime. To this end, this paper provides an overview of the current state of science and technology in this interdisciplinary topic by describing, with reference to high voltage (HV) technology/engineering, the design of the insulation system, the discharge physics, the degradation mechanisms, the statistical effects to be considered, and the partial discharge measurement methods.

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Section: E Measurement Test Setup and Specimenmentioning

confidence: 99%

The Insulation Resilience of Inverter-Fed Low Voltage Traction Machines: Review, Challenges, and Opportunities

2022

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“…(37) and (38) define the status of the switched lines in the initial network topology. Constraints (39) and (40) prevent each line in the set Ω from changing its status more than once through all the stages. Constraint (41) models the correlation between the lines defined for the switching exchange.…”

Section: B Optimal Transitional Droops For a Single Line-openingmentioning

confidence: 99%

“…For each droop technique, the lineopening operation is performed using two droop settings: the first one achieves proportional load sharing (PLS) among the DGs, and the second setting is the optimized transitional droops (OTD) that minimize the power flow in the switched line. To evaluate the severity of the produced voltage transient, the peak of the surge voltage (PSV) [39], [40] accompanying the lineopening operation is recorded for each droop technique and setting. Since the steady-state values of the voltage before and after performing the switching operation are different due to the change in the loading of the droop-controlled DGs, the PSV is measured relative to the steady-state value of the voltage after executing the line opening operation as clarified in Fig.…”

Section: A Assessment Of the Voltage Transient Improvement For A Single Line-switching Operationmentioning

confidence: 99%

Dynamic Transitional Droops for Seamless Line-Switching in Islanded Microgrids

El-Sayed

Farag

Zeineldin

et al. 2021

IEEE Trans. Power Syst.

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Line-switching operations introduce several concerns to microgrid operators since they trigger reliability and power quality issues in addition to increasing the wear and tear cost of switching devices. This paper proposes a novel methodology for achieving seamless line-switching in low-inertia islanded microgrids. The proposed methodology aims at mitigating the detrimental line-switching impacts by minimizing the power flow in the switched lines at the moments of executing the switching operations. The minimization of the power flow is realized by optimizing the droop control parameters of the DGs during the transition from one network topology to another. Besides, during executing a series of line-switching operations, the sequence of switching is also optimized to minimize the total switched power. While optimizing the line-switching execution sequence, the transitional droops are optimized for each line-switching operation within that sequence. A dynamic mixed-integer nonlinear programming problem is formulated to find both the optimized dynamic transitional droops and line-switching sequence simultaneously. Simulation results demonstrate the effectiveness of the proposed seamless line-switching methodology where the switched power can be reduced by more than 80% for a single line-switching operation and 54% considering a series of four switch exchanges in addition to achieving several instances of zero-current switching. As a result, a significant decrease in the peak of voltage transients has been recorded for some cases.

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“…nsulation related problems represent one the main causes leading to premature failures in electrical machines. The adoption of modern variable speed drives has been widely recognised, by the scientific community, as one of the primary reasons of machines' insulation over-stress [1][2][3]. The combination of fast switching devices (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…This means that a precise understanding of the insulation system's behaviour in terms of PD inception during actual operation is crucial for guaranteeing the simultaneous fulfilment of reliability and power density constraints. Various investigations have been carried out on PD analysis for insulation systems of Type-I machines [2,8,9], although only few of them refer to motors for aerospace applications [10][11][12]. In [10], an innovative 'contactless' PD detection method for machines' insulation is proposed, and its suitability is verified in a representative aerospace environment, down to 100 mbar pressure.…”

Section: Introductionmentioning

confidence: 99%

Electrical Machines for the More Electric Aircraft: Partial Discharges Investigation

Madonna

Giangrande

Zhao³

et al. 2021

IEEE Trans. on Ind. Applicat.

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Modern electrical machines employed in transportation applications are required to provide high performance in terms of power (and torque) density. At the same time, being these applications safety-critical, a significant level of reliability and/or fault tolerance is expected. Among all the factors which can compromise motors reliability, partial discharges inception is one of the most crucial, in particular for low voltage, random wound machines. This paper presents an extensive experimental investigation on partial discharges in electrical machines for aerospace applications. Measurements are carried out using both sinusoidal and fast-rising pulses in a representative aerospace environment, emulating the typical ambient conditions encountered throughout a commercial aircraft mission, and beyond (i.e. down to 30 mbar). As a main result of the investigation, it is proved that electrical machines employed for actuating primary flight control surfaces feature a higher risk of partial discharges inception. Therefore, their insulation system demands an extremely careful design.

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Surge Test-Based Identification of Stator Insulation Component With Partial Discharge Activity for Low Voltage AC Motors

Cited by 23 publications

References 23 publications

The Insulation Resilience of Inverter-Fed Low Voltage Traction Machines: Review, Challenges, and Opportunities

The Insulation Resilience of Inverter-Fed Low Voltage Traction Machines: Review, Challenges, and Opportunities

Dynamic Transitional Droops for Seamless Line-Switching in Islanded Microgrids

Electrical Machines for the More Electric Aircraft: Partial Discharges Investigation

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