Materials of porcelain insulator

 Some demand about materials of porcelain insulator in some tender.  Orient Group can provide porcelain insulators that meet the specification.

 
Materials of porcelain insulator
1.  Porcelain of porcelain insulator
High grade, wet process porcelain used in the manufacturer of insulator units shall comply with the requirement of IEC 60672. The porcelain used in the manufacture of shells shall be sound, free from defects thoroughly vitrified.
2.   Glaze of porcelain insulator
Where specified porcelain insulators shall be glazed Munsell Brown or Grey in accordance with ANSI Z55.1. The glaze shall cover all exposed parts of the insulator and shall have a good lusture, smooth surface and good performance under the extreme weather conditions of a tropical climate. It shall not crack or chip by ageing under the normal service conditions. The glaze shall have the same coefficient of expansion as of the porcelain body throughout the working temperature range.
3.   Cement of porcelain insulator
Cement used in the manufacture of the insulator shall not cause fracture by expansion or loosening by contraction. The cement shall not give rise to chemical reaction with metal fittings and its thickness shall be as small and uniform as possible. Proper care shall be taken to correctly centre and locate individual parts during cementing.
4.   Caps and Pins of porcelain insulator
Insulator caps and bases of malleable cast iron shall be manufactured from a suitable grade of MCI complying with the requirement of BS EN 1563 for spheroidal graphite, or BS EN 1562 for whiteheart and pearlytic. Ductile cast iron of suitable grade may be used for caps and bases.
Insulator end fittings of forced or cast aluminium alloy shall be manufactured from a suitable grade of aluminium alloy complying with the requirements of BS EN 515, 573, 586, 603, 604 or BS EN 1559, 1676, 1706 and/or BS EN 1676 or equivalent respectively.
5.  Security Clips of porcelain insulator
Security 'R' clips shall be of austenitic stainless steel capable of complying with the requirements of relating to inter-crystalline corrosion tests of BS 970: Part 1 and BS EN 10084, 10085, 10087, 10095, 10250 and PD 970. 2.5% extra Security clip shall be provided.
6.   Zinc Sleeve of porcelain insulator
Zinc sleeve shall have a total impurity not greater than 0.2 percent and shall comply with the requirement of BS EN 1179 or IEC 61325 or equivalent.
Insulator end fittings of forced or cast aluminium alloy shall be manufactured from a suitable grade of aluminium alloy complying with the requirements of BS EN 515, 573, 586, 603, 604 or BS EN 1559, 1676, 1706 and/or BS EN 1676 or equivalent respectively.
 
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