Abstract

The paper reflects more than ten years of design and manufacturing of insulators for insulated crossarms in 420 kV networks, mainly for a pivoted attachment to the tower. With the availability of high strength cores with large diameters, single post solutions became the preferred option, because of the better aesthetic appearance. General technical aspects of compact lines such as alternative designs, advantages and disadvantages are presented and specific issues in the design stage and for the practical testing are discussed. Typically, the electrical design of the insulated crossarm is less challenging in comparison to the mechanical design. For this reason, a full scale mechanical testing of the critical load scenario is recommended

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