In the context of high power
transmissions, the insulators are the support structures for wires and devices.
The use of knobs and tube house wiring provides the flexible insulation. The HV
power transmission use air as insulation or wires are buried in the ground for
insulation. Besides, these methods, there is no other
economic way to insulate the HV lines. In transmission, the insulators are used
to separate the wire from any structural support. The other reasons of using
insulation is to stop the lighting from connecting the wires , and stop sparks or ground shots by not
allowing the buildup of water , oil or dirt on the insulator . To prevent this
kind of build up on insulators, they are designed in ridged form.
Wood and glass insulators were used
initially as the insulators. Dry wood may be good insulator but it is not the
perfect one. Glasses were used to insulatre telegram lines and telephone lines,
as the electricity was used only for telephone and telegraph lines. However,
these were only for low voltage currents.
Ceramics are used to Electrical
BPL Kits Manufacturer insulate the high power transmission lines and
temperature. Glass insulators were not able to withstand high power and
temperature. They would crack at the high temperatures. Initially the simple
porcelain products were used as insulators. But later, for higher voltages, the
new designs were made in existing porcelain products to enhance their
performance with special coating.
Besides, these insulators, the many
other common insulators used according to the requirements of the transmission
of power and wires. The plastic has replaced rubber as insulation material for wires.
PVC, nylon and cresyl phthalate are the
type of plastic that are used now in most type of wires.
Paper and cardboard are used today in
some situations as they are cheap and can be used perfectly with high heat and
high voltages. Mica is another good insulator and conductor .mica can be easily
shaped and stamped for electrical components. This product is also used in many
common capacitors.
Teflon is durable, slipper and have
resistant to corrosion. This material is used in cables jackets. Teflon can
come in many forms like FEP and ETFE.
PFA, Perfluoroalkoxy is considered
better than PTFE in flexibility. It has resistant to chemical attack and is transparent.
The negative point of this material is
that it cannot be folded unlimited number of times. The PFA is used near the
sea shores, because it has resistant to salt spray. The dielectric strength of
this material is 4 times higher than PTFE
Some non conductivity gases GI Strip
Manufacturer in Delhi used
to stop the formation of arc between two conductors in compact encapsulated
metal container. Gas is also used in switch gears to disconnect two voltages
safely. Some gas insulated transformers are also used.
Petroleum product is also used as an
electrical insulator and heat conductor. The insulating oil can take heat away
from transformer coil. Insulating oil is also used by some capacitors.
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