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PROTECTING ELECTRIC CONTROL EOUIPMENT

机译:保护电气控制设备

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摘要

If it is a given that your cables are sized properly for both steady-state currents and predictable short-term surges, you have two choices for protection from short circuits and overloads: fuses and circuit breakers.rnFuses. Common practice is to put in a fuse rated for 125 percent of the maximum load current — or the next standard size up, The voltage rating is important too because it affects arc extinction time and energy let-through. If the load is subject to high inrush currents — such as that on motors, transformers and heaters that have low cold resistance — note their duration. They could, upon startup, take some six times the steady-state current, but usually only for a few seconds.
机译:如果假设电缆的尺寸适合稳态电流和可预测的短期电涌,则有两种选择可防止短路和过载:保险丝和断路器。通常的做法是装入额定值为最大负载电流的125%的保险丝,或者增加下一个标准尺寸的保险丝。额定电压也很重要,因为它会影响消弧时间和能量传递。如果负载承受高浪涌电流(例如,具有低抗冷性的电动机,变压器和加热器上的浪涌电流),请注意其持续时间。在启动时,它们可能需要大约六倍于稳态电流的电流,但通常只需几秒钟。

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  • 来源
    《Process Heating》 |2009年第5期|24-25|共2页
  • 作者

    Arthur Holland;

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  • 正文语种 eng
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