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Shed design

Contamination performance of station insulators is influenced by the kind and degree of contamination.
It is also largely influenced by the shed shape, especially for the application of DC systems.

Based upon accumulated laboratory test data and field experiences regarding efficiency of leakage distance of various shed shapes for AC & DC systems, NGK has established the following standard shed shapes.

Plain shed

Plain shed

Single rib shed

Single rib shed

Double rib shed

Double rib shed

Alternating shed

Alternating shed

Super deep rib shed (This shed shape is used mainly for DC use)

Super deep rib shed
(This shed shape is
used mainly for DC use)

DC fog withstand voltage characteristics of station insulators with various shed shapes

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