NDLI: Thermal Characterization of Electrical Wires and Insulation Operated in Variable Frequency Mode

Content Provider	Springer Nature Link
Author	Cardenas, Dorindo E. Ezekoye, Ofodike A.
Copyright Year	2015
Abstract	NFPA 70 provides guidelines on conducting wire size rating for different service current ratings. Additionally, an engineering calculation method is provided for unusual cases. While not apparent, these guidelines are valid only for 60 Hz type frequencies. Electrical conductors have increased Joule heating with higher frequency operation because of electromagnetic effects like skin and proximity effects and the increase of total reactance of conductors and appliances. Until now, those effects have not been a fire safety concern, but the large increase in high power applications using frequencies higher than 60 Hz in variable frequency drives, also called adjustable frequency drives or simply “AC drives”, to control the operation of large motors, changes this. While research has improved the performance of motors and AC drives, there has been relatively little research on the thermal effects and fire safety implications of these systems. In this paper we show that conductors used with common variable frequency power electronics have heat dissipation rates that can be up to 50% larger than what is calculated according to the standard formulas used for 60 Hz systems. Using accelerated aging models for the wire insulation it is shown that these increases in heat dissipation rate can reduce useful cable life by a factor of two or more.
Starting Page	1071
Ending Page	1092
Page Count	22
File Format	PDF
ISSN	00152684
Journal	Fire Technology
Volume Number	51
Issue Number	5
e-ISSN	15728099
Language	English
Publisher	Springer US
Publisher Date	2015-03-22
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electric conductor Variable frequency drive Overheating Signal shape Power factor Civil Engineering Mechanics Characterization and Evaluation of Materials Physics
Content Type	Text
Resource Type	Article
Subject	Materials Science Safety, Risk, Reliability and Quality

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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