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
Single rib shed
Double rib shed
Alternating shed
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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