Seismic Performance Study of Composite Insulator Assembled in 1 000 Kv Capacitor Voltage Transformer By Quasi-Static Test and Shaking Table Test

Abstract eng:
Insulators are main structural elements for many kinds of equipment in electrical substations. Traditionally, insulators used in substations are made of porcelain, which are vulnerable in earthquake events due to the brittleness of porcelain material. In recent years, insulators made of fiberglass reinforced polymer have gained great importance for better mechanical properties. However, studies on seismic performance of electrical equipment which assembles composite insulators are still limited. This paper studies mechanical properties and seismic performance of hollow core composite insulators by impact test, quasi-static bending test and shaking table test. Full scale composite insulators assembled in 1 000 kV capacitor voltage transformer, which is so for the highest voltage level, are taken as specimens. Flexural stiffness, vibration modes and damping ratio are obtained from bending test and impact hammer test of composite insulators. Failure mode of the insulator under static bending load is observed, which is mainly failure of metallic flange. These parameters are employed in seismic modeling of the 1 000 kV capacitor voltage transformer and seismic response of the equipment is analyzed. In the last, shaking table test of the equipment is carried out as validation, which proves that the numerical model built in this paper has a high overall accuracy in seismic response prediction. The study gains insights on the performance of composite insulators and provides an example for seismic performance evaluation of composite insulators, which are meaningful seismic design of electrical substation. The study also points out that increasing the strength of metallic flange should be a major consideration for further seismic performance improvement of composite insulators in this scale.

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