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Contact Material for Vacuum Interrupters based on CuCr with a Specific High Short Circuit Interruption Ability

机译：具有特定高短路中断能力的基于CuCr的真空断路器的触头材料

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Vacuum interrupters (VI) with a specific high short circuit interruption ability are mostly equipped with the well known contact material based on copper and chromium. A review of different production techniques as well as behaviour and microstructure of commercially available materials is presented with emphasis on two of the predominantly applied methods. The contact material''s switching performance strongly depends on its mechanical properties, gas and element concentration evaluated for each batch of base material. The contacts microstructure is investigated using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). Switching performance is proven on standard VIs and the examination is held in a high performance lab by interrupting a sequence with a huge number of short circuit currents in accordance to the standards according IEC 62271-100. When conducting limitation tests at higher demands than required a ranking of material batches is presented. The study is based on standard contact material with a chromium content of 25 wt.% used on the transverse magnetic field (TMF) contact system. Derived from the results a very compact VI for a rating of 40.5 kV at 40 kA with increased specific performance is introduced.
机译：具有特别高的短路中断能力的真空灭弧室（VI）大多装有以铜和铬为基础的众所周知的接触材料。介绍了不同的生产技术以及可商购材料的行为和微观结构，并重点介绍了两种主要应用的方法。接触材料的转换性能在很大程度上取决于其机械性能，气体和每批基材评估的元素浓度。使用扫描电子显微镜（SEM）和能量色散X射线（EDX）研究了触头的微观结构。开关性能已在标准VI上得到证明，并根据高性能的实验室，根据IEC 62271-100的标准，通过中断具有大量短路电流的序列来进行检查。当以超出要求的更高要求进行极限测试时，会列出材料批次的等级。该研究基于在横向磁场（TMF）接触系统上使用的铬含量为25 wt。％的标准接触材料。从结果中得出了非常紧凑的VI，额定电流为40 kA时额定电压为40.5 kV，具有更高的比性能。

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