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首页> 外文会议>MedPower 2014 >The effect of the fuse enclosure temperature rise on low voltage overhead conductor protection
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The effect of the fuse enclosure temperature rise on low voltage overhead conductor protection

机译：保险丝盒温度升高对低压架空导体保护的影响

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摘要

This work examines aspects of low voltage distribution line protection through fuses. More specifically, the effect of the increased ambient temperature inside a fuse-box, due to joule losses, on the current rating of the fuses is examined in conjunction with the ampacity of the overhead conductors. The temperature rise of the fuse-box is calculated according to IEC 60890 with some improvements so as to cope with external installation of the switchboard, i.e. the heat gain due to solar irradiance. Finally, whether the protection offered by the fuses is sufficient, is examined, as fuse operation at high ambient temperatures causes a shift of the time current curve towards shorter times. Through this work, the exact relation between conductor ampacity and fuse rating can be ascertained, thus enabling protection engineers to identify any possible cases of conductor over-loading, under-utilization, or nuisance tripping of the feeder.
机译：这项工作研究了通过熔断器进行低压配电线路保护的各个方面。更具体地说，结合架空导体的载流量，检查了由于焦耳损耗而引起的保险丝盒内环境温度升高对保险丝的额定电流的影响。保险丝盒的温度升高是根据IEC 60890计算得出的，并进行了一些改进，以适应配电盘的外部安装，即因太阳辐射而产生的热量。最后，要检查保险丝提供的保护是否足够，因为在高环境温度下的保险丝操作会导致时间电流曲线向更短的时间偏移。通过这项工作，可以确定导体载流量和熔断器额定值之间的确切关系，从而使保护工程师能够确定导体可能出现的导体过载，供电不足或误跳闸的情况。

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