Cable
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Electrical Cable will be made of one or multicore insulated
core and sheath.Also we can add the protection layer over the insulated core.
Electrical Cable’s Size is much more big,Construction is much more complex,this
is the main different from normal wire.
Electrical Cable Sheath: PVC,PE,Rubber,Lead,etc. Function is
protect the insulated core from mechanical damage/wet/chemicals/light and other
kinds of damage.
Electrical Cable Insulated Core: Made of Aluminium(AL) Or
Copper(CU). The Insulated core can be made of one conductor or stranded by more
conductor.
Electrical Cable Insulation layer: Cable’s insulation must have
the higher insulation resistance,higher electric field strength,low dielectric
loss and low dielectric constant.The Common Material Of
Insulation-PVC(Polyvinyl Chloride),PE(Polyehylene),XLPE(Cross Linked
Polyethylene),RUBBER,etc.
Electrical Cable Outer Sheath:
Common Material-PVC,PE,Rubber,LSZH. For protect the protection layer(like Steel
Tape,Steel Wire,etc.) from corrosion and damage,we will use the extruded
PE,PVC,Rubber be the outer sheath.
Electrical Cable Protection
Layer: Common Material-Galvanized Steel Tape,Steel Wire,Copper Tape,Copper Wire
will be used at Armoured Layer wrapping at the inner sheath.Also the Armoured
Layer have the function of electric-field screening and electromagentic wave
interference.
Compare with the overhead
cable, Underground Power Cable’s advantage is small insulation distance between
insulated core,small occupation space(do not occupy the air space), will not be
polluted by ambient environment,Reliable power transmission,safe to people and
environment.
So the Electrical power cable
mostly will be used at popular place and heavy traffic place.And also when we
consider the clean and tidy,we can use the underground power cable.If we want
to transmit electric power through the river or ocean,we can use the power
cable.
Disadvantage of underground
power cable: cost is high,the cable installation and the check will be
troublesome.
Advantages of Underground Power Cables
1. Safe Operation :
If we consider about the
advantages of Underground Power systems for power distribution and
transmission. Normally underground power cables are safer than the overhead
power line. So the probability of the hazard occurrence is very less.
2. Good General Appearance :
The appearance of the
underground cables is really good than traditional overhead lines. Since it
located underground there is no such visibility of the line for people. So in
most urban cities and highly dense domestic areas, this type of cables are
widely used to have a better appearance compared with overhead power lines.
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