Abstract
To analyze the overheating problem of the valve-side bushings of high voltage direct current (HVDC) converter transformer, which is mainly caused by current-carrying connections defects at copper–aluminium transition region in the bushing, this paper set up a 3-D electromagnetic-thermal analysis model for the valve-side bushings, and a method was proposed to calculate the thermal distribution of the valve-side bushings under the influence of current-carrying connections defects. Based on this model, the details of an example were shown in this paper, and the numerical results agreed with the measured results within 1%. Then, the temperature field distribution characteristics of valve-side bushing under different working current I, defect degree k, and ambient temperature Tamb were determined. According to the characteristics, the temperature difference ΔT and working current I of the bushing were applied to evaluate contact resistance at the copper–aluminium transition region of the bushing, which can be provided by a novel method to evaluate for current-carrying connections defects in the valve-side bushings.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
