Passive loop optimisation for HV Joint zone

The limits of magnetic flux densities over buried High Voltage cables require, in some cases, means to shield these fields; a method widely used in the industry is the application of passive loops. Short-circuited passive loops represent a subset of passive loops and mainly differ in the connection between the cable terminations. A numerical optimization approach has been carried out to optimize the shielding capabilities of passive loops over HV cable junction zones. The mathematical model, the topological layout, and the effects of shielding wire size and numbers have been studied, and the results presented. A comparison with concentric passive loops and HMCPL shielding has been conducted, highlighting the advantages and disadvantages of this apparatus.