Dynamic behavior of 500 kV metal oxide arresters with a new type of lead dampers
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Abstract:
In order to find out dynamic behaviors of the 500 kV zinc oxide arresters with and without a new type of lead damper, the dynamic behavior experiment and finite element analysis are carried out by means of single point input and single point output(SISO）measurement. The results of dynamic behavior experiment show that the primary frequencies of these two structures are between 1 Hz and 10 Hz and the difference between these two primary frequencies is not obvious, indicating that the overall stiffness of the two structures is low. The frequency of these two structures has hardly changed by the lead dampers, but the damping ratio of the arresters with the dampers is increased nearly 3 times, thus the fashion of vibration-reduction control of the dampers is to provide additional damping to the equipments. Owning to increment of damping device with the new type of lead dampers, there is an above reduction of 46% in the maximum stress of bottom porcelain pipe and the new type lead dampers can also decrease the relative displacement at the top of bushing. The results of finite element analysis show that the level modes of the 500 kV zinc oxide arresters with and without the new type of lead dampers are main modes and the vertical modes and torsional modes are not obvious.
