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UNCLASSIFIEDIn order to verify the technique, two trial field regions have been used in successfully analyzing the sheath helix and the case of a homogeneous dielectric support. A composite metal-ceramic helix has also been analyzed. Simulation for the composite helix shows a reasonable dispersion for some combinations of harmonics over a wide frequency range when results are compared to experiment. However, the impedance computation is not yet satisfactory.In future developments, major modifications will be made to the trial fields in order to satisfy all boundary conditions simultaneously and improve the predicted impedance. In addition, the technique will be applied to other devices including wedge and rod supports.

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Changes and improvements in a-c and d-c transmission techniques and in system requirements provided the incentive jor a new review of the relative suitability of a-c and d-c for extra-high-voltage overhead transmission. Results of this study show that d-c continues to have disadvantages that re strict its use, for EHV overhead applications, to point-to-point transmission of power over distances in excess of 750 to 900 miles