Partial-discharge-inception testing on low-voltage motors

Bogh, D.; Coffee, J.; Stone, G.C.; Custódio, J. R.

doi:10.1109/tia.2005.861369

Cited by 36 publications

(5 citation statements)

References 5 publications

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“…In inverter-fed motor-driven systems, the overvoltage occurring at the motor terminals can reach twice the bus voltage due to the impedance mismatch between the feeding cable and the motor windings under the PWM pulse [16,17]. Moreover, because of the random wound motor winding structure and uneven distribution of the overvoltage along the winding, the turn-to-turn electrical stress enhances greatly at the first few turns of winding [18][19][20][21][22]. Thus, the turn-to-turn insulation is more likely to be deteriorated by PWM pulsegenerated PD activity, resulting in a shorter service lifetime of the motor [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Voltage rise rate‐related generalised probabilistic lifetime model of turn‐to‐turn insulation in inverter‐fed motors

Yang,

Bai,

Lei

et al. 2023

High Voltage

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The lifetime model of turn‐to‐turn insulation in inverter‐fed motors is studied. A lifetime model has been built by considering the effect of inverter‐generated high voltage rise rate (dv/dt up to 20 V/ns). This model is followed by the generalised probabilistic model, in which the lifetime is proportional to the nth power of the voltage rise rate. Moreover, by investigating the effect of voltage rise rate on the partial discharge characteristics, it is found that the effect of voltage rise rate on the charge transport process in a voltage cycle is similar to that of the voltage amplitude. The enhanced partial discharge activity and induced charges are responsible for accelerated ageing and thus determine the final lifetime of turn‐to‐turn insulation. In this case, the generalised probabilistic electric lifetime model is applicable to the voltage rise rate as well as the voltage amplitude.

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Section: Introductionmentioning

confidence: 99%

Voltage rise rate‐related generalised probabilistic lifetime model of turn‐to‐turn insulation in inverter‐fed motors

Yang,

Bai,

Lei

et al. 2023

High Voltage

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“…The presence of through defects leads to insulation breakdown. The higher the probability of an inter-turn short circuit, the greater the number of damages [2,5,6].…”

Section: Introductionmentioning

confidence: 99%

Providing a Minimum Defectiveness of Inter-Turn Insulation at the Manufacturing Stage and During the Exploitation

Leonov¹,

Supueva²

2022

REFFIT

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The reliability of a low-voltage asynchronous electric motor is primarily determined by the reliability of the stator winding insulation. Common reasons for the failure of the insulation system are the unsatisfactory quality of the enameled wires and electrical insulating materials used for imperfection and violation of the technological process of winding and insulating work, and the discrepancy between operating modes. In the vast majority of cases, failures occur due to damage to the inter-turn insulation as the weakest element. This causes the need to study the insulation system resistance to the formation of defects. The results of assessing the stability of the insulation of winding wires to defect formation are obtained, taking into account the features of the operational loads characteristic of frequency-controlled drives with pulse-width modulation of the output voltage and the influence of the inter-turn insulation defectiveness level on its reliability indicators is also studied. The authors have developed the measures to reduce the defectiveness of inter-turn insulation at the manufacturing stage and during operation. This will ensure a minimum level of insulation defects and increase the resource of asynchronous electric motors by reducing the number of failures.

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“…It is now known that the space charges trapped in the polymer layers makes the analysis very complex [6]. Measurement method of the Partial Discharge Inception Voltage (PDIV) inside low voltage machines has been developed [7], [8]. PDs cause an earlier aging of the Electrical Insulation System (EIS) [9]- [12].…”

Section: Introductionmentioning

confidence: 99%

Proposition for Improving the Design of Motor Windings for Low-Pressure Environment

Roger

Ait-Amar

Napieralska‐Juszczak

et al. 2020

IEEE Trans. on Ind. Applicat.

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A new approach is proposed for designing coils free of partial discharges (PDs) for compact machines operating at high altitudes. The proposed method consists in using an enameled wire made with a thin additional resistive layer on the outer surface, which reduces strongly the electrical field in the voids between the wires of random coils. With such a wire, PDs occur only in specific zones situated near the wire connections and a local reinforcement of the insulation can increase strongly the partial discharge inception voltage (PDIV). The paper proposes a theoretical method for determining the properties of the resistive layer. The local reinforcement of the insulation is analysed with an electrostatic simulation and Paschen's law. Measurements confirm the effectiveness of the proposed method.

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Partial-discharge-inception testing on low-voltage motors

Cited by 36 publications

References 5 publications

Voltage rise rate‐related generalised probabilistic lifetime model of turn‐to‐turn insulation in inverter‐fed motors

Voltage rise rate‐related generalised probabilistic lifetime model of turn‐to‐turn insulation in inverter‐fed motors

Providing a Minimum Defectiveness of Inter-Turn Insulation at the Manufacturing Stage and During the Exploitation

Proposition for Improving the Design of Motor Windings for Low-Pressure Environment

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