power cable Basic structure of
No matter what kind of power cable,
Its most basic components are three parts,
I.e. conductor
Insulation and
Sheathing. For power cables with medium voltage and above, the conductor has high potential when transmitting electric energy.
In order to improve the distribution of electric field,
Reduce the electric field distortion at the conductor surface and the outer surface of the insulation layer,
Avoid sharp points
Terminal discharge,
The cable shall also have internal and external shielding layers.
Generally speaking,
The basic structure of power cables must have conductors
(Also
Weighable core)
, insulation layer, shielding layer and protective layer, which are poor in composition and structure
Different types of power cables with different purposes are formed
The filler core and filler shall be added to make the cable round and convenient for production, manufacturing and construction laying.
one
Conductor (or conductor core)
：
Its function is to conduct current. There are solid cores and strands. Materials include copper, aluminum, silver, copper clad steel, aluminum clad
Steel, mainly copper and aluminum. Copper conducts electricity much better than aluminum.
two
Refractory layer:
Only fire-resistant cables have this structure.
Its function is that the cable can withstand a certain time in a fire,
For people
More time to use electricity when escaping.
three
Insulation:
It is wrapped outside the conductor to isolate the conductor, bear the corresponding voltage and prevent current leakage.
There are many kinds of insulation materials,
Some require a small dielectric coefficient,
To reduce losses,
Some requirements are obstructed
Flammability or high temperature resistance,
Some require that the cable will not produce or produce less smoke or harmful gas when burning,
yes , we have
It is required to be resistant to oil and corrosion, and some are required to be soft.
four
Shielding layer:
Outside the insulation layer and inside the outer sheath, the function is to limit electric field and electromagnetic interference.
For different types of cables, the shielding materials are different, mainly including: copper wire braiding, copper wire winding
Aluminum wire (aluminum alloy wire) braiding, copper tape, aluminum foil, aluminum (steel) plastic tape, steel tape, etc.
five
Fill layer:
The filling function is mainly to make the cable round and stable in structure. Some cable fillers also play a role in blocking water
Fire resistance, etc.
The main materials are polypropylene rope
Fiberglass rope
Asbestos rope
Rubber, etc,
There are many kinds,
But one of the main performance requirements is non hygroscopic materials, which of course cannot conduct electricity.
Basic structure of power cable
No matter what kind of power cable, its most basic components are three parts, namely conductor, insulation layer and sheath. For power cables with medium voltage and above, the conductor has high potential when transmitting electric energy. In order to improve the distribution of the electric field, reduce the electric field distortion on the conductor surface and the outer surface of the insulation layer, and avoid tip discharge, the cable should also have internal and external shielding layers. In general, the basic structure of power cable must be composed of four parts: conductor (also known as core), insulation layer, shielding layer and sheath. The differences in composition and structure of these four parts form different types of power cables with different purposes. Core fillers and fillers need to be added between the insulated cores of multi-core cables to facilitate the cable to be twisted into a round shape, It is convenient for production, manufacturing, construction and laying.
Conductor (or conductor core): it is used to conduct current. There are solid cores and strands. Materials include copper, aluminum, silver, copper clad steel, aluminum clad steel, etc., mainly copper and aluminum. Copper conducts electricity much better than aluminum.
Fire resistant layer: only fire resistant cables have this structure. Its function is that the cable can withstand a certain time in a fire, giving people more time to use electricity when escaping.
Insulating layer: it is wrapped outside the conductor to isolate the conductor, bear the corresponding voltage and prevent current leakage. There are a variety of insulation materials. Some require a small dielectric coefficient to reduce loss, some require flame retardant performance or high temperature resistance, some require that the cable will not produce or produce less smoke or harmful gases when burning, some require oil resistance and corrosion resistance, and some require flexibility.
Shielding layer: outside the insulation layer and inside the outer sheath, it is used to limit electric field and electromagnetic interference. For different types of cables, the shielding materials are different, mainly including copper wire braiding, copper wire winding, aluminum wire (aluminum alloy wire) braiding, copper tape, aluminum foil, aluminum (steel) plastic tape, steel tape, etc.
Filling layer: filling is mainly used to make the cable round and stable. Some cable fillers also play the role of water resistance and fire resistance. The main materials are polypropylene rope, glass fiber rope, asbestos rope, rubber, etc. There are many kinds of materials, but one of the main performance requirements is non hygroscopic materials, which of course cannot conduct electricity.
