Fatigue analysis and experimental research on the sealing stick of 550 kV circuit breaker
                                             GAO Zhen kui, QIN Xiao yu, MA Xiao hong, ZHANG Lei, LUO Chang luo
                                       （Henan Pingzhi High Voltage Switchgear Co., Ltd., Pingdingshan 467013, China）

Abstract: In order to solve the problem of how to analyze the fatigue life of the circuit breaker sealing stick.The sealing stick of 550 kV circuit breaker was studyed, respectively, stress tests and open colse operation tests were carried out to achieve the stroke time curve and stress time curve of a section of sealing stick.A three dimensional simulation model was created,and these curves were used as simulation boundary conditions. The flexible simulation ability of ANSYS and ADAMS was combined to get the force on the sealing stick at each position; and finally the Workbench N_code designlife module according to S N curve or ε N curve were used to carry out fatigue life analysis;Two simulation results were got.Different applications of these two methods were discussed, and then the actual operation of the sealing stick life experiment was completed. The results indicate that according to S N curve to analyze sealing stick s fatigue life can get a results which is good consistency with actual opearing test, which provides a method for predicting the fatigue life of other moving parts in 10 000 times life experiments.

Key words: sealing stick; parameter measurement; coupled analysis; fatigue life