Месяц: Август 2014

LIQUIDS FOR HIGH-VOLTAGE CAPACITORS

The capacitor is one of the oldest electrical components. An oil-immersed capacitor was developed in the 1850s, but the fundamental technologies of modern oil-impregnated and oil — filled high-voltage power capacitors originated with those of high-voltage power cables. After PCBs were developed around 1930, PCBs (mainly trichlorobiphenyl for high-voltage power capacitors) were used for can-type […]

LIQUIDS FOR SWITCHGEARS

Liquids for switchgear (switchgear oils) must have arc sup­pression properties and high dielectric strength. Arc suppres­sion properties are basically due to the high thermal conduc­tivity of hydrogen gas produced by the decomposition of switchgear oils. Thus it is desirable that liquids easily pro­duce hydrogen gas and that the amount of free carbon pro­duced by their […]

LIQUIDS FOR POWER CABLES

Oil-immersed power cables were developed and put into use in the 1880s, and a historic milestone in recent engineering and industrial progress was established by the invention and development of the oil-impregnated or oil-filled (OF) power cable by Emanuelli in 1923. OF cables are impregnated with oils without voids or moisture and then hermetically sealed […]