Title :
Short-time withstand current of electrical apparatus
Author :
Zhenbiao, Li ; Yicheng, Zhang
Author_Institution :
Dept. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
Most electrical apparatus should be able to withstand the short time high current. Generally it is believed that the temperature rise of apparatus is proportional to the I/sup 2/t (I denotes current and t time), therefore in the Lab we can increase the time and decrease the current to do an equivalent experiment based on the equal I/sup 2/t. But in this paper, the author find the equivalent experiment principle should be rather than I/sup 2/t. Detailed solution of the heat conduct equations is given, and the calculated results for Cu and Ag are listed.
Keywords :
electric current; electrical contacts; heat conduction; Ag; Cu; electrical apparatus; equivalent experiment principle; heat conduction equation; short-time withstand current; temperature rise; Conducting materials; Conductivity; Conductors; Contact resistance; Electrodes; Joining processes; Laplace equations; Surface resistance; Temperature dependence; Testing;
Conference_Titel :
Electrical Contacts, 1997., Proceedings of the Forty-Third IEEE Holm Conference on
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-3968-1
DOI :
10.1109/HOLM.1997.638053
