福州卓凱電子科技有限公司

VRDM3910/50LWB00

MRY01B-2 JANCD-MRY01B-1

VRDM3910/50LWB00

BN624A822G53 MC301

1、根據(jù)不同的電氣設備的供電方式選用不同的漏電保護器

　　單相220V電源供電的電氣設備，應選用二極二線或單極二線式漏電保護器。

　　三相三線式380V電源供電的電氣設備，應選用三極式漏電保護器。

　　三相四線式380V電源供電的電氣設備或單相設備與三相設備共用的電路，應選用三極四線或四極四線式漏電保護器。

　　2、根據(jù)電氣線路的正常泄漏電流，選擇漏電保護器的額定漏電動作電流

　　選擇漏電保護器的額定漏電動作電流值時，應充分考慮到被保護線路和設備可能發(fā)生的正常漏電流值。

　　選用的漏電保護器的額定漏電不動作電流，應小于電氣線路和設備的正常漏電電流的大值的2倍。

　　漏電保護器的額定電壓、額定電流、短路分斷能力、額定漏電電流、分斷時間應滿足被保護供電線路和電氣設備的要求。

　　漏電保護器接線錯誤方式：

　　1、用于支線保護時，各支線應有各自的專用零線，且兩相鄰支線路的零線不得相連。如果將兩分支線路相連，零線中的電流互流，破壞零序電流互感器內(nèi)的工作電流平衡，使漏電保護器發(fā)生誤動作。如果想就近利用動力分支線的零線作為照明分支線的零線，則會造成動力分支線的漏電保護器動作。

　　2、一個用電設備只能接在一條保護支路內(nèi)，不得跨接在兩條分支回路內(nèi)，不得接在零序互感器的前面，也不得采取一線一地制供電，否則，會導致漏電保護器誤動作。

　　3、裝有漏電保護器和未裝漏電保護器的用電設備，不得共用一個接地裝置。例如，當電機M1的絕緣損壞而外殼帶電時，電機M2的外殼也帶電，由于電流沒有經(jīng)過漏電保護器，所以未起到漏電保護的作用。

數(shù)字電源有用DSP控制的，還有用MCU控制的。

　　4、單相負荷應盡可能均衡分配。如果分配不均（如一相的線路偏長，設備集中），則負荷較重的一相，其漏電電流偏大，因而干線的三相不平衡漏電電流增大，達到一定值時就會使干線首端的漏電保護器動作。

柵極正電壓 的變化對IGBT的開通特性、負載短路能力和dVcE／dt電流有較大影響。

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我公司主要經(jīng)營西門子abb,施耐德等國外多家品牌，產(chǎn)品涉及變頻器，儀器儀表，變送器，可編程控制器plc和人機界面。

電話：15506917382??? 0591-62182535?

傳真：0591-22989937?? QQ：583745937? 聯(lián)系人：王工

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