EFFICIENT SHIELDING OF THREE-PHASE CABLE LINE MAGNETIC FIELD BY PASSIVE LOOP UNDER LIMITED THERMAL EFFECT ON POWER CABLES

Abstract

This paper deals with a mitigation of a three-phase cable line magnetic field by a new type of passive shield. We consider a cable line with a flat arrangement of cables. The developed single-loop shield has an asymmetric magnetic coupling with the cable line, due to the use of two different ferromagnetic cores. Its high shielding efficiency is experimentally confirmed. As the developed shield is 0.2÷0.3 m away from the cable line, its thermal effect on the cable line is negligible. As the result, we obtain expressions for the shielding efficiency, parameters of the shield and the cores.

Keywords

• cable line
• magnetic field
• passive loop
• shielding
• magnetic core