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干式電流互感器

電流電壓互感器的正確選擇和使用

發布日期:2022-04-18 點擊率:164

  1、選擇
  ① 按被測量線路的電壓高低、電流大小選擇合適的電壓或電流互感器,以確保操作人員和儀表的安全。
  ② 一般選用互感器的準確度等級比測量儀表的準確度高兩倍。如0.5級儀表須選用0.1級互感器。
  ③ 根據需要接入互感器的負載(包括測量儀表及連接導線)大小及性質,選擇合適的額定容量的互感器。
  如額定容量S為5伏安的電流互感器,在次級額定電流I2N=5A和功率因數時,次級所能接入的最大負載
  2、使用
  ① 電壓互感器的次級線圈不許短路。電流互感器的次級線圈不許開路。
  ② 互感器的次級線圈、鐵芯及外殼都要可靠接地,以確保人身和設備安全。
  ③ 除特殊設計的可逆互感器外,一般互感器不許反方向使用(即不能將初級與次級互換)。
  ④ 儀表接入互感器后,應將電壓表讀數乘以變壓比,電流表讀數乘以變流比才是所測高電壓和大電流的數值。

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