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      上海人民電器廠介紹交流接觸器選型的原則

      2020/10/16 11:05:35      點擊:
      上海人民電器廠介紹交流接觸器選型的原則,要注意以下幾點:
      1、交流接觸器的電壓等級要和負載相同,選用的接觸器類型要和負載相適應。
      2、按短時的動、熱穩定校驗。線路的三相短路電流不應超過接觸器允許的動、熱穩定電
      流,當使用接觸器斷開短路電流時,還應校驗接觸器的分斷能力。
      3、接觸器吸引線圈的額定電壓、電流及輔助觸頭的數量、電流容量應滿足控制回路接線
      要求。要考慮接在接觸器控制回路的線路長度,一般推薦的操作電壓值,接觸器要能夠在
      85~110%的額定電壓值下工作。如果線路過長,由于電壓降太大,接觸器線圈對合閘指令有可能不起反映;由于線路電容太大,可能對跳閘指令不起作用。
      4、根據操作次數校驗接觸器所允許的操作頻率。如果操作頻率超過規定值,額定電流
      應該加大一倍。
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