Station Post Insulators
NGK has been supplying station post insulators with various mechanical rating in accordance with IEC standard or ANSI standard and so on.
In addition to products for HVAC, NGK can supply HVDC post insulators with appropriate shed design for HVDC.
NGK are also supplying semi-conducting glaze station post insulators, which have superior anti-contamination performance for severe contamination condition.
More than 10 thousand NGK semi-conducting glaze station post insulators have been used successfully in the world since 1973.
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.
Single rib shed
Double rib 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
BUS support (Japan)
Semi-conducting SP (Thailand)
Test & Standard
NGK station post insulators can meet the requirements and tests specified in the following standards.
IEC Standard and Technical Report
|60060-1||High-voltage test techniques Part1: General definitions and test requirements|
|60168||Test on indoor and outdoor post insulators of ceramic material or glass for systems with normal voltages greater than 1000V|
|60273||Characteristics of indoor and outdoor post insulators for systems with normal voltages greater than 1000V|
|60437||Radio interference test on high-voltage insulators|
|60507||Artificial pollution tests on high-voltage insulators to be used on AC systems|
|60815||Guide for the selection of insulators in respect of polluted conditions|
|61245||Artificial pollution tests on high-voltage insulators to be used on D.C. systems|
|C29.1||Electrical Power Insulators - Test methods|
|C29.9||Wet-Process Porcelain insulators - Apparatus, Post-type|
Inquiry about Porcelain Insulators
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