Dynamic Load Model Study for Overhead Transmission Lines. Final Report, January 1977--September 1977

摘要

Additional testing of scale models and full scale testing of a steel pole transmission line located in Billerica, Massachusetts, is reported. A scale model of exp 1 / sub 25 the geometric scale was designed, fabricated and tested under simulated dynamic loading including broken static wire, broken conductor and ice unload of static wire. Full scale tests simulating broken static wire and ice unload of the static wire were performed in the field. The primary objective was to compare the test results at model scale to the test results at full scale, thereby to verify the method of model analysis. The full scale transmission line and the full scale instrumentation, the model test line and the model instrumentation, the actual tests conducted on each system, and the results obtained are described. A concept referred to as ''equivalent pole-top load'' is introduced and it is shown that this is a convenient concept for analysis. The dynamic bending strains at the base of the pole are correlated with model ground line moments. Model ground line moments are also correlated with dynamic tension changes in static wire and conductor for the model. Certain loading effects near a dead-end structure are also briefly studied. (ERA citation 03:017470)