描述
6DD1642-0BC0
供电系统的浪涌主要来自两方面的原因：外部（雷电原因）和内部（电气设备启停和故障等）。浪涌的特点往往是时间很短（雷电造成的过电压往往在微秒级，电气设备造成的过电压往往在毫秒级），但是瞬时的电压和电流极大，极有可能对用电设备和电缆造成危害，所以需要浪涌保护器对它们进行保护。
浪涌保护器，英文名SurgeProtectiveDevice，简称SPD，是一种为各种电子设备、仪器仪表、通讯线路提供安全防护的电子装置，主要用于限制过电压和泄放电涌电流。浪涌保护器一般是与被保护的设备并联，当产生过电压时，可以起到分流和限压的效果。防止过大的电流与电压对设备产生损害。
浪涌保护器的核心元件是内部的一个非线性元件。根据非线性元件的不同，浪涌保护器可以分为开关型（核心元件主要为放电间隙）和限压型（核心元件主要为压敏电阻）。
放电间隙和压敏电阻的工作原理虽然有差异，但是基本的特性非常相似：在没有过电压时，他们的阻抗都非常高，一般是兆欧级，几乎相当于断路。当出现过电压时，阻抗迅速下降到几欧，浪涌电流就会通过浪涌保护器流入地，而不会进入设备，同时，由于浪涌保护器的这时的阻抗很小，它的两遍电压也比较小，同时因为他和被保护的设备并联，也就防止设备承受较大的浪涌电压。这样，就起到了泄流和限压的效果。
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