Stress grading system optimisation for an inverter-fed rotating machine

IF 4.4 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC High Voltage Pub Date : 2024-08-20 DOI:10.1049/hve2.12478
Peng Wang, Wenhuan Zhao, Yue Zhang, Shuai Yang, Andrea Cavallini, Chaofan Yu, Chizhou Cheng, Yingwei Zhu
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Abstract

Stress grading systems using non-linear resistive coatings are a key component to suppress surface corona in the end-windings of rotating machine. Compared to a sinusoidal-fed motor, the high slew rate of the voltage at the flanks of the repetitive square voltages from the inverter cause large capacitive currents to flow in the main wall insulation. These large currents, if not properly considered in the design phase, lead to severe electrothermal stress of the grading system. Experiments and simulations were conducted on a stress grading system whose structure arises from limitation posed by the motor structure. Measurements performed with different rise times show that the maximum potential along the conductive armour tape (CAT) increases non-linearly with increasing axial distance, and the potential at the edge of the CAT reached nearly twice the peak-to-peak voltage at 500 ns rise time, leading to corona inception. As metal plates are used in the machine to dampen vibrations in the end-winding, similar plates were also fastened to the stress grading system, worsening the already inadequate corona suppression performance. The stress grading system was therefore modified, avoiding the surface corona while, at the same time, reducing the temperature in the grading system to acceptable levels.

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优化变频器驱动旋转机械的应力分级系统
使用非线性电阻涂层的应力分级系统是抑制旋转机器端部绕组表面电晕的关键部件。与正弦馈电电机相比,来自逆变器的重复方波电压侧面的电压回转率很高,会在主壁绝缘中产生较大的电容电流。如果在设计阶段没有适当考虑这些大电流,就会导致分级系统产生严重的电热应力。我们对应力分级系统进行了实验和模拟,该系统的结构受电机结构的限制。不同上升时间的测量结果表明,随着轴向距离的增加,导电铠装带(CAT)沿线的最大电势呈非线性增加,在 500 ns 上升时间时,CAT 边缘的电势达到峰-峰电压的近两倍,从而导致电晕的产生。由于机器中使用金属板来抑制端部绕组的振动,应力分级系统上也固定了类似的金属板,这使得本已不足的电晕抑制性能更加恶化。因此,对应力分级系统进行了修改,避免了表面电晕,同时将分级系统的温度降低到可接受的水平。
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来源期刊
High Voltage
High Voltage Energy-Energy Engineering and Power Technology
CiteScore
9.60
自引率
27.30%
发文量
97
审稿时长
21 weeks
期刊介绍: High Voltage aims to attract original research papers and review articles. The scope covers high-voltage power engineering and high voltage applications, including experimental, computational (including simulation and modelling) and theoretical studies, which include: Electrical Insulation ● Outdoor, indoor, solid, liquid and gas insulation ● Transient voltages and overvoltage protection ● Nano-dielectrics and new insulation materials ● Condition monitoring and maintenance Discharge and plasmas, pulsed power ● Electrical discharge, plasma generation and applications ● Interactions of plasma with surfaces ● Pulsed power science and technology High-field effects ● Computation, measurements of Intensive Electromagnetic Field ● Electromagnetic compatibility ● Biomedical effects ● Environmental effects and protection High Voltage Engineering ● Design problems, testing and measuring techniques ● Equipment development and asset management ● Smart Grid, live line working ● AC/DC power electronics ● UHV power transmission Special Issues. Call for papers: Interface Charging Phenomena for Dielectric Materials - https://digital-library.theiet.org/files/HVE_CFP_ICP.pdf Emerging Materials For High Voltage Applications - https://digital-library.theiet.org/files/HVE_CFP_EMHVA.pdf
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