The zero sequence impedance of the cable changes with the zero sequence current as the zero sequence current flows in the ground and the sheathing simultaneously.

 
  • 電力電纜的零序阻抗隨零序電流的大小而改變,如果采用恒定值的零序阻抗來(lái)進(jìn)行零序電流保護的整定,容易導致保護的不正確動(dòng)作。
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