33kV Pin Type Composite Insulators service conditions
The 33kV Pin Type Composite Insulators shall be suitable for continuous operation outdoors in tropical areas at altitudes of up to 2000m above sea level, humidity of up to 90%, average ambient temperature of +30ºC with a minimum of -1ºC and a maximum of +40ºC, heavy saline conditions along the coast and tropical sunshine conditions. The level of galvanizing for all ferrous parts and materials used shall be suitable for these conditions.

33kV Pin Type Composite Insulators

33kV Pin Type Composite Insulators materials and constructions
◆ The pin insulators shall be manufactured to IEC 61109, other applicable /latest IEC standards and the requirements of this specification
◆ The insulator shall be pin type moulded in one single piece and supplied complete with metal end fittings. Metal fittings shall be galvanized to ISO 1461 to suit service conditions specified in clause 33kV Pin Type Composite Insulators service conditions.
◆ The composite pin insulator shall be made of composite materials of high resistance to moisture, ultraviolet radiation, high temperatures and tropical sunshine conditions. The core shall be made of resin-impregnated glass fibres free from defects. The housing of the insulator shall be manufactured from high quality silicone rubber
◆ The under surface and grooves of sheds or skirts shall be easy cleaning. Sheds shall be substantially symmetrical in shape without appreciable warping
◆ The insulator shall be suitable for both vertical and horizontal applications. It shall be suitable for both bare and protected conductors
◆ The composite pin type insulator bottom metal end fitting shall be suitable for mounting on steel cross arm
◆ The top and side grooves shall be designed to accept conductor sizes in the range 7 – 18.2mm overall diameter
◆ The final color of the insulator housing shall be BROWN.

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