Modeling Electrical Aging of Polyimide Kapton HN Under High-Voltage High-Frequency Pulse Waveforms

Mirza, Arshiah Yusuf; Chen, Weiqiang; Bazzi, Ali M.; Nguyen, Hiep H.; Cao, Yang; Lv, Hao

doi:10.1109/tdei.2022.3204075

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…An element aging is an occurrence of irreversible changes in its material, affecting its ability to perform the required service [26]. Causes of aging are factors imposed by operation, environment, technology, or test that influence the performance of the component subjected to stresses [27].…”

Section: A Ageing Of Shaft Elements From Torsional Stressmentioning

confidence: 99%

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

Lingom,

Song-Manguelle,

Betoka-Onyama

et al. 2024

IEEE Access

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Despite consistent maintenance and monitoring equipment installed in pumped storage hydropower (PSH) facilities, many shafts and electrical component failures are reported, possibly resulting from undetected sources. These sources include undetectable vibrations or, in certain conditions, highfrequency mechanical or electrical harmonics. They may induce premature material fatigue and aging, leading to accelerated wear and premature system failure. This paper presents a direct method for plotting Campbell diagrams of large motors supplied by variable frequency drives for torsional analysis purposes. The method is applied to two-level, three-level neutral-point clamped, and seven-level cascaded H-bridge multilevel inverters, commonly used industrially available voltage source inverter (VSI) topologies for pumped PSH plants. These diagrams display the locations where torsional stress components induced by VFDs can interfere with shaft resonance modes. These locations are where threatening torsional stresses can build up. The method simplifies the determination of the magnitude of stimulus forces in the motor airgap that may threaten the shaft. An analytical assessment of the cascaded H-bridge VFD-induced torsional stresses under unbalanced operation is also proposed. The accuracy of the theoretical developments is supported by selected simulations results at different operating points and different fault conditions. Hybrid experimental-numerical VFD-induced harmonic stress analysis is also performed to demonstrate the relevance of the proposed study. Results are crucial for a robust design of the system integration to avoid catastrophic failures.

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Section: A Ageing Of Shaft Elements From Torsional Stressmentioning

confidence: 99%

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

Lingom,

Song-Manguelle,

Betoka-Onyama

et al. 2024

IEEE Access

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“…These factors drive the high economic value of PIs and the growing demand for power electronics. [22,23] Therefore, PI specialty plastics with dynamic, reversible properties have become a new research field that has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Rising of Dynamic Polyimide Materials: A Versatile Dielectric for Electrical and Electronic Applications

et al. 2023

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Polyimides (PIs) are widely used in circuit components, electrical insulators, and power systems in modern electronic devices and large electrical appliances. Electrical/mechanical damage of materials are important factors that threaten reliability and service lifetime. Dynamic (self‐healable, recyclable and degradable) PIs, a promising class of materials that successfully improve electrical/mechanical properties after damage, are anticipated to solve this issue. The viewpoints and perspectives on the status and future trends of dynamic PI based on a few existing documents are shared. The main damage forms of PI dielectric materials in the application process are first introduced, and initial strategies and schemes to solve these problems are proposed. Fundamentally, the bottleneck issues faced by the development of dynamic PIs are indicated, and the relationship between various damage forms and the universality of the method is evaluated. The potential mechanism of the dynamic PI to deal with electrical damage is highlighted and several feasible prospective schemes to address electrical damage are discussed. This study is concluded by presenting a short outlook and future improvements to systems, challenges, and solutions of dynamic PI in electrical insulation. The summary of theory and practice should encourage policy development favoring energy conservation and environmental protection and promoting sustainability.

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Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

Lagerweij,

Niasar

2024

High Voltage

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Innovative test methods are required to keep up with the increased demand for insulation materials which can withstand the high‐frequency square‐wave voltages generated by power‐electronic equipment. Test systems using high‐voltage, high‐frequency transformers have proven versatile and easy to realise. The authors investigate the application of amorphous cut cores in such transformers. Analytical and numerical models for the transformer and its frequency response are developed, aiding the design process. An amorphous core‐based transformer is designed for 8 kVpk output at 100 kHz and compared to two previous designs based on ferrite cores. The frequency and pulse response, as well as the high‐voltage and thermal performance, are evaluated. The comparison shows that while the low parasitics of the amorphous‐based transformer allow for superior frequency response, they are unsuitable for long‐duration tests with high pulse repetition frequencies (25–100 kHz) due to increased core losses. The partial discharge inception and flashover voltage are comparable to the ferrite‐based transformers.

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Modeling Electrical Aging of Polyimide Kapton HN Under High-Voltage High-Frequency Pulse Waveforms

Cited by 3 publications

References 21 publications

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

Variable Frequency Drives-Induced Torsional Stresses in Pumped Hydropower Storage Applications

Rising of Dynamic Polyimide Materials: A Versatile Dielectric for Electrical and Electronic Applications

Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

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