1970-02-01

VOLTAGES PRODUCED BY TRANSIENT CURRENTS FLOWING UPON SHIELDS OF CABLES 700932

Electromagnetic disturbances to aircraft and to aerospace and industrial ground facilities often produce large circulating currents in the shields of electrical cables. The electromagnetic disturbances may be caused by lightning, switching of high voltage circuits or by other electromagnetic effects. This paper presents experimental data showing how surge voltages are related to the type of construction of the cable, to the material of the cable shield, to magnitude and waveshape of the shield current and the type of termination of the shield. Special attention is given to industrial grade metal conduit since conduit, particularly the rigid steel variety, can have very effective shielding properties.

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