Title :
Calculation of the Short-time Withstand Current for Air Circuit Breaker
Author :
Xiang, Honggang ; Chen, Degui ; Li, Xingwen ; Ji, Liang ; Tong, Weixiong
Author_Institution :
Xi´´an Jiaotong Univ., Xian
Abstract :
In the optimization design of contact system for the air circuit breaker (ACB), it is important to calculate the short-time withstand current. Introducing the contact bridges to describe contact spots between movable and fixed contacts, transient analysis is carried out by coupling electromagnetic field and thermal field to parallel contact systems, where nonlinear of ferromagnetic splitter plates and properties of conduct material varying with temperature are under consideration. In each time step of calculation, the cross-sectional areas of the contact bridges are changed with the contact forces by Holm formula. The proposed method could be used to analyze the short-time withstand current of ACB.
Keywords :
circuit breakers; electromagnetic coupling; ferromagnetic materials; transient analysis; ACB; Holm formula; air circuit breaker; electromagnetic field coupling; ferromagnetic splitter plates; parallel contact system; short-time withstand current; transient analysis; Bridge circuits; Circuit breakers; Conducting materials; Coupling circuits; Design optimization; Electromagnetic coupling; Electromagnetic fields; Temperature; Thermal conductivity; Transient analysis; ACB; contact bridge; short-time withstand current;
Conference_Titel :
Electrical contacts - 2007, the 53rd ieee holm conference on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
1-4244-0837-7
Electronic_ISBN :
1-4244-0838-5
DOI :
10.1109/HOLM.2007.4318225