Electric Contact Material Selection for Medium and High Voltage DC Circuit Breakers
Electric Contact Material Selection for Medium and High Voltage DC Circuit Breakers
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DOI：
10.1007/s42341-020-00180-5
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发表时间：
2020-02
影响因子：
1.9
通讯作者：
T. Damle;M. Varenberg;L. Graber
中科院分区：
文献类型：
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作者：
T. Damle;M. Varenberg;L. Graber
中高压直流电网越来越多地被提议用于陆地、船载和飞机电力系统。然而，多端直流网络只有通过开发直流断路器才能实现。由于断开直流电流很困难，混合断路器（由无电弧快速机械隔离开关 (FMS) 与固态开关并联组成）是最有前途的解决方案。 FMS 的电触点所承受的应力与交流和低压直流断路器和隔离开关的应力不同。触头材料的选择对直流断路器的性能有重大影响。 Ashby 方法用于通过将 FMS 触点的要求转化为目标和约束并导出每个目标的材料指数来系统地识别最适合的触点材料。最大限度地减少触点的功率损耗、磨损和过热被确定为关键目标。结果表明，铜基合金和化合物比银基合金和化合物以及其他接触材料更合适。
Medium and high voltage DC grids are increasingly proposed for terrestrial, shipboard and aircraft power systems. However, multi terminal DC networks can only be realized with the development of a DC circuit breaker. Due to the difficulty in breaking DC currents, hybrid circuit breakers—which consist of a non-arcing fast mechanical disconnect switch (FMS) in parallel with a solid state switch—is the most promising solution. The stresses experienced by the electric contacts of FMS are different from those of AC and low voltage DC breakers and disconnect switches. The choice of contact material has a significant impact on the performance of the DC circuit breaker. The Ashby method is used to systematically identify the best suited contact materials by translating the requirements of FMS contacts into objectives and constraints and deriving material indices for each objective. Minimizing power loss, wear and overheating of contacts are identified as the key objectives. The results suggest that copper-based alloys and compounds are more suitable than silver based alloys and compounds and other contact materials.