Abstract
Based on the analysis of heat transfer process in alternating current (AC) contactor, a thermal model of contactor is proposed in this paper. The conduction in the contactor and the convection and radiation around the exterior surfaces are considered in the model. The transient magnetic circuit method is adopted to calculate the heat generated by the winding and the shading coils. The temperature distribution of the main circuit is calculated by the thermal-electric coupling method, considering the resistance of conducting path, the contact resistance of main contact, the wiring terminals and the feedings. The theory of similarity for fluid and the Stefan-Boltzmann law is applied to calculate the heat transfer coefficient. The temperature field of an AC contactor with nominal current of 100A is simulated. And the results are verified by experiments. Based on the model, the influence of the screw force acting on the wiring terminals, the force of main contact spring and the section area of feedings on the temperature rise are researched. The results are useful in designing and optimizing AC contactor.
| Original language | English |
|---|---|
| Pages (from-to) | 71-77 |
| Number of pages | 7 |
| Journal | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society |
| Volume | 22 |
| Issue number | 5 |
| State | Published - May 2007 |
| Externally published | Yes |
Keywords
- AC contactor
- Contact resistance
- Temperature field
- Transient magnetic circuit
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