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在探月任务中,由于月球表面温度变化非常大,探测器上的电缆需要经历高温达125℃,低温达-180℃的严酷极限温度条件,因此电缆装联所用的电连接器、热缩套管、灌封胶等材料是否能经受住如此严酷的温度是一个疑问。为此开展了高低温下电缆用材料的特性变化试验,并对出现的问题进行了分析,得出了可适用于深空探测的合适的材料。试验结果如下:(1)airborn微小型电连接器在125℃高温下绝缘性能显著下降,国产J30JH微小型连接器高温绝缘性能较稳定;(2)125℃高温下国产RSG热缩套管发生熔化并粘连;(3)高低温循环作用下,采用ATUM套管加热缩带或纯热缩带的方式可保证尾罩处理满足使用要求。 相似文献
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随着信息技术的飞速发展,"智能化"这个词语已经遍布我们生活的方方面面,并逐步改变着人们生产生活的方式.智能技术在电网技术中的应用是促进电网发展的关键,而在智能电网中最重要的就是变电站,它是智能电网最关键的防护,作用非常显著.为了使智能变电站更适应智能电网的发展,需要对继电保护配置加以提升,以此来实现对电网的智能化保护.为此,本文首先介绍了智能变电站的具体结构,再综合阐述了几点保护配置的原则,并根据以往的经验和当前的电网改进方案,探讨继电保护配置. 相似文献
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To restrain the formation of AuSnx intermetallic components (IMCs) in solder joints, Zn was added into Sn-rich solders. The solder joints were fabricated by a laser reflow soldering method, and then they were aged at 125 ℃. The results show that the total thickness of AuSnx IMCs at the interface of pure Sn solder and Au foils reaches about 54 μm under the condition of 600 h aging. In Sn-1.5Zn solder joints, however, formation of AuSn4 IMCs is restrained greatly. As the content of Zn in the solder is increased to 3.5%(mass fraction), no AuSn4 IMC is observed at the interface. Au-Zn phases form beside AuSn2 and AuSn IMCs layers. As for Sn-9.0Zn solder joints, Au-Zn and Au-Zn-Sn phases and few AuSnx IMCs form at the interface. Moreover, total thickness of the phases and IMCs is far less than that ofAuSnx IMCs in the pure Sn solder joints. 相似文献
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