Abstract
A method is proposed to investigate the dynamic characteristics of a magnetic release in molded case circuit breaker. Based on the static field assumption, two grids of the magnetic torque and flux linkage are calculated with the variation of the current and air gap firstly. Considering the influence of tripping force, coupled with circuit equation and mechanism motion equation, the dynamic characteristics may be obtained with Runge-Kutta 4 method. And the influence of the reaction spring on the operation characteristic is analyzed. Experiments demonstrate that the difference of the protection characteristic curve between experiment and simulation is below 10%, and it is easier to adjust the initial length of the reaction spring to meet the requirement of changing tripping current linearly, relative to adjusting the stiffness of the reaction spring and the initial working air-gap.
| Original language | English |
|---|---|
| Pages (from-to) | 890-894 |
| Number of pages | 5 |
| Journal | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University |
| Volume | 39 |
| Issue number | 8 |
| State | Published - Aug 2005 |
Keywords
- Action characteristics
- Finite element method
- Magnetic release
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