Lifetime Behavior of Turn Insulation in Rotating Machines Under Repetitive Pulsed Stress
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23220%2F25%3A43976219" target="_blank" >RIV/49777513:23220/25:43976219 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/1996-1073/18/14/3826" target="_blank" >https://www.mdpi.com/1996-1073/18/14/3826</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/en18143826" target="_blank" >10.3390/en18143826</a>
Alternative languages
Result language
angličtina
Original language name
Lifetime Behavior of Turn Insulation in Rotating Machines Under Repetitive Pulsed Stress
Original language description
Insulation materials are critical for the reliability and performance of electrical power systems, particularly in high-voltage rotating machines. While failures can arise from thermal, mechanical, or electrical stress, they predominantly manifest as electrical breakdowns. Prior research has primarily concentrated on aging in straight winding sections, despite evidence indicating that failures frequently occur in the bending regions of turn insulation. This study explores the influence of high-frequency pulsed electrical stress on the lifetime behavior of Type II insulation systems used in high-voltage rotating machines. Practical samples, designed with geometric configurations and technology akin to that in rotating machines, were tested under conditions characterized by voltage slew rates (dv/dt) exceeding 10 kV/mu s, with variations in frequency and waveform shape. The findings reveal that the rate of electrical aging remains consistent across differing pulse widths, risetimes, and polarities, displaying a similar lifetime exponent. Nonetheless, insulation durability is markedly more compromised under pulsed conditions. At the identical times-to-failure, the sinusoidal waveform necessitated nearly twice the applied peak voltage as the bipolar pulse waveform. This finding clearly suggests that pulsed excitation exacerbates insulation degradation more effectively due to the sharp rise times and high (dv/dt) rates imposing substantial electrical stress on dielectric materials.
Czech name
—
Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20201 - Electrical and electronic engineering
Result continuities
Project
<a href="/en/project/EH23_020%2F0008490" target="_blank" >EH23_020/0008490: Czech Incubator of Technologies for Energy Networks</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Energies
ISSN
1996-1073
e-ISSN
1996-1073
Volume of the periodical
18
Issue of the periodical within the volume
14
Country of publishing house
CH - SWITZERLAND
Number of pages
18
Pages from-to
nestránkováno
UT code for WoS article
001535323200001
EID of the result in the Scopus database
2-s2.0-105011696342