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Composite solid core support insulators

Composite solid core support insulators are covered by IEC 62231-1, Ed. 1.0: “Composite station post insulators for substations with ac voltages greater than 1 000 V up to 245 kV”.

Composite solid core support insulators

Composite solid core support insulators

Composite solid core support insulator development:
Several options were investigated. Both porcelain and composite hollow core insulators were installed many years ago using air as filling materials. However, catastrophic failures caused by moisture ingress and inner flashover raised questions about the reliability of this type.

A solid insulating filler material would be a great way to deal with any issues regarding inner electrical strength, leakage currents etc. However, high cost and weight would not allow solid materials for an economic solution.

A liquid insulation material provides a similar situation but requires special attention to solve issues like thermal expansion and leakage.

Fiber glass solid core support insulators are arising in the 1990’s replacing the some hollow core insulator on the substations.

 

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