Assuming that the insulator is structurally equivalent to a short column member sitting on top of the column, you may use normal beam elements to model it. Define a porcelain material and assign it to the insulator. Assign the appropriate cross section to it using the Define option within Properties Whole Structure. That way it would be like any other structural member but as long as you do not need to check/design it, you can just ignore the forces in those members.
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