TY - GEN
T1 - Simulation of the effect of armor coating conductivity on the stress grading coating performance under PWM multilevel waveforms
AU - Espino-Cortes, Fermin P.
AU - Asiain-Olivares, Tomas I.
AU - Gomez, Pablo
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2014
Y1 - 2014
N2 - The high electric field present along the stress grading (SG) coatings in coil ends of medium voltage rotating machines fed by adjustable speed drives (ASD) can lead to surface discharge and an increased resistive heating. Previous works had shown that the analysis of SG coatings for coil ends in motors working with ASD requires consideration of the effect of the conductive armor coating. Usually the design of the conductive armor coating (CAT) and the SG coatings is done separately; however, it is important to understand the combined performance of both coatings, especially under pulse width modulated (PWM) waveforms. With this purpose, transient finite element method (FEM) was used to analyze how changes in the conductivity of the CAT modify the electric field and resistive heat density along both coatings for multilevel PWM waveforms. According with the results, the increment of the CAT conductivity reduces the maximum heat and maximum electric field in the CAT; however, a change in the properties of the SG coating can be required to avoid transferring the problem to this coating, either for three or five levels PWM waveforms.
AB - The high electric field present along the stress grading (SG) coatings in coil ends of medium voltage rotating machines fed by adjustable speed drives (ASD) can lead to surface discharge and an increased resistive heating. Previous works had shown that the analysis of SG coatings for coil ends in motors working with ASD requires consideration of the effect of the conductive armor coating. Usually the design of the conductive armor coating (CAT) and the SG coatings is done separately; however, it is important to understand the combined performance of both coatings, especially under pulse width modulated (PWM) waveforms. With this purpose, transient finite element method (FEM) was used to analyze how changes in the conductivity of the CAT modify the electric field and resistive heat density along both coatings for multilevel PWM waveforms. According with the results, the increment of the CAT conductivity reduces the maximum heat and maximum electric field in the CAT; however, a change in the properties of the SG coating can be required to avoid transferring the problem to this coating, either for three or five levels PWM waveforms.
KW - Electric field
KW - Erosion
KW - Pollution
KW - Spacer cable system
KW - Tracking
UR - http://www.scopus.com/inward/record.url?scp=84978394485&partnerID=8YFLogxK
U2 - 10.1109/ICACACT.2014.7223542
DO - 10.1109/ICACACT.2014.7223542
M3 - Contribución a la conferencia
AN - SCOPUS:84978394485
T3 - 33rd Electrical Insulation Conference, EIC 2015
SP - 172
EP - 175
BT - 33rd Electrical Insulation Conference, EIC 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 33rd Electrical Insulation Conference, EIC 2015
Y2 - 7 June 2015 through 10 June 2015
ER -