Magnetic Heating of Transmission Line Clamps

Magnetic heating of transmission line clamps is reduced by the use of nonmagnetic parts. An economical method is the use of a non-ferrous body. Of the three methods used to measure clamp power loss, the multiturn coil circuit is recommended. The results of tests made with the multiturn coil show the marked difference between the power loss of the all-ferrous clamp and that of the nonferrous-body clamp. If clamp and conductor losses are known, the temperature rise of a conductor inside a clamp can be estimated.