描述
6ES5948-3UR21 VERSION7
供電系統(tǒng)的浪涌主要來自兩方面的原因：外部（雷電原因）和內(nèi)部（電氣設(shè)備啟停和故障等）。浪涌的特點(diǎn)往往是時(shí)間很短（雷電造成的過電壓往往在微秒級(jí)，電氣設(shè)備造成的過電壓往往在毫秒級(jí)），但是瞬時(shí)的電壓和電流極大，極有可能對(duì)用電設(shè)備和電纜造成危害，所以需要浪涌保護(hù)器對(duì)它們進(jìn)行保護(hù)。
浪涌保護(hù)器，英文名SurgeProtectiveDevice，簡稱SPD，是一種為各種電子設(shè)備、儀器儀表、通訊線路提供安全防護(hù)的電子裝置，主要用于限制過電壓和泄放電涌電流。浪涌保護(hù)器一般是與被保護(hù)的設(shè)備并聯(lián)，當(dāng)產(chǎn)生過電壓時(shí)，可以起到分流和限壓的效果。防止過大的電流與電壓對(duì)設(shè)備產(chǎn)生損害。
浪涌保護(hù)器的核心元件是內(nèi)部的一個(gè)非線性元件。根據(jù)非線性元件的不同，浪涌保護(hù)器可以分為開關(guān)型（核心元件主要為放電間隙）和限壓型（核心元件主要為壓敏電阻）。
放電間隙和壓敏電阻的工作原理雖然有差異，但是基本的特性非常相似：在沒有過電壓時(shí)，他們的阻抗都非常高，一般是兆歐級(jí)，幾乎相當(dāng)于斷路。當(dāng)出現(xiàn)過電壓時(shí)，阻抗迅速下降到幾歐，浪涌電流就會(huì)通過浪涌保護(hù)器流入地，而不會(huì)進(jìn)入設(shè)備，同時(shí)，由于浪涌保護(hù)器的這時(shí)的阻抗很小，它的兩遍電壓也比較小，同時(shí)因?yàn)樗捅槐Ｗo(hù)的設(shè)備并聯(lián)，也就防止設(shè)備承受較大的浪涌電壓。這樣，就起到了泄流和限壓的效果。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價(jià)格，大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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