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The standard of station post insulators

 IEC 60273 is the traditional basic standard for station post insulators, “Distinguishing feature of indoor and outdoor post insulators for systems with nominal voltages greater than 1000V”. However, latest edition of 1990-02 only covers the designs of station post insulators made from ceramic material or glass for lightning impulse withstand voltage levels above 325 kV. Only for levels below equal 325 kV also designs made from organic material are described.

station post insulators
Also IEC 62231 “composite station post insulators for substations with a.c. voltages greater than 1000 V up to 245 kV”, just under edition, vicariously shows the present limitation of composite technique to certain lengths of station post insulators , being a basic constriction of the today’s solid core designs. The standardization environment described above clearly points out the situation: the system voltages for todays (solid core) composite station post insulators designs are limited, since the diameters realized by this technique is limited. 
The higher voltage levels are served by ceramic technique, at which a stacking technique is usual to realize the needed heights up to several meters. This situation obviously suggests the composite hollow core technique being an appropriate option to cover station post insulators at high lengths and voltage levels, using the well-practiced manufacturing techniques for one-piece designs up to 12 meters and even more.
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