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Post type insulators

 Post type insulators made from polymer or porcelain materials, post type insulators used to support and insulate 115kv in substations, stations and power plant.

Post type insulators

The specifications for post type insulators:
◆ ANSI C29.1-1988: main tests for electrical insulators
◆ ANSI C29.9-1983 wet process porcelain insulators – apparatus, post-type
◆ ASTM A153-1982: zinc coating (hot dip) on iron and steel hardware

Post type insulators main technical parameters

Overall height, mm 45
Impulse withstand, kv 550
Leakage distance, mm 99
Positive critical impulse flashover, kv 610
60Hz wet withstand, kv 230
Ultimate mechanical strength in cantilever, lbs 2600
Ultimate mechanical strength in tension, lbs 17500
Ultimate mechanical strength in compression, lbs 12000
Ultimate mechanical strength in torsion, in- lbs 30000

Post type insulators marking includes manufacturer’s name or symbol, the year of manufacture and load ratings. Load ratings shall be stated in units of pound.

Post type insulator packaging could occur during shipping, handling or long-term outside storage. If slatted crates are used, each insulator shall be sealed in plastic. If the sealed crates are used, plastic is not required.


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