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Norwegian Technical Porcelain in Fredrikstad on a postcard from approximately 1920-1940. Norsk Teknisk Porselen AS (NTP) is a Norwegian manufacturer of ceramic and composite insulators based in Fredrikstad. NTP mostly produces ceramic insulators for electrostatic precipitators, with sales worldwide. Founded in 1916, the first plastic product ...
Porcelain has been used for electrical insulators since at least 1878, [59] with another source reporting earlier use of porcelain insulators on the telegraph line between Frankfurt and Berlin. [60] It is widely used for insulators in electrical power transmission system due to its high stability of electrical, mechanical and thermal properties ...
NGK Insulators has been producing porcelain continuously for nearly 100 years, and, sometime in the mid 1980s, its total output surpassed 150 million porcelain units.
Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4–10 kV/mm. [8] Glass has a higher dielectric strength, but it attracts condensation and the thick irregular shapes needed for insulators are difficult to cast without internal strains. [9]
Under Frederick the Great the acid resistance of porcelain was used for laboratory and pharmacy equipment. In 1849 the first ceramic bell insulator was used on the telegraph route between Frankfurt and Berlin. In 1891, porcelain insulators were presented for the first time at the International Electrotechnical Exhibition in Frankfurt. The ...
Victor Insulators, Inc. based in Victor, New York (founded 1893 by Fred M. Locke) is the oldest insulator company in North America. They originally made glass insulators for electrical lines. They suspended operations during the Great Depression , but resumed operations in 1935 as Victor Insulators.
An insulator of a telephone transmission line A pin insulator ceramic plate used for 20 KV lines. A pin insulator is a device that isolates a wire from a physical support such as a pin (a wooden or metal dowel of about 3 cm diameter with screw threads) on a telegraph or utility pole.
Electrical stoneware: historically used for electrical insulators, although it has been replaced by electrical porcelain. Another type, Flintless Stoneware, has also been identified. It is defined in the UK Pottery (Health and Welfare) Special Regulations of 1950 as: "Stoneware, the body of which consists of natural clay to which no flint or ...
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