Instrumentation of Replacement Base Insulator Assembly -VLF East Tower, Lualualei,Hawaii.

摘要

The cone-type base insulators beneath a 1,500-foot-high guyed VLF antenna was replaced with station post-type base insulators. Strain gages were mounted on both types of insulators during the tower raising and lowering operations to determine the distribution of load on the base insulator assembly. The maximum strain deviation for the cone-type insulators from the average strain was 6%,which indicated that the load was distributed almost equally on the three insulators at the midtier. The strain deviation for the station post-type insulators varied from -36to +52% when compared with the average strain value. Finite element computer analyses were performed for both the cone and post insulators subjected to a direct axial load. The vertical and circumferential stresses compared very well with the average values of the experimental strain readings.