First,WTTEZ cable structure:
2.Inorganic composite insulation;
3.Inorganic composite expansion filling;
4.Wrinkle copper tube sheath;
5.Low-smoke halogen-free outer sheath;
WTTEZ cable performance characteristics:
1 fireproof and fire resistant performance is very superior
In order to ensure the normal supply of the cable in the flame,that is,to keep the cable structure stable under fire conditions,in the cable structure design,a coating layer with refractory and expansion properties is added,and the coating layer is in flame condition and volume.Expansion makes the cable insulation structure more stable.Therefore,the cable can continue to supply power in the event of a fire close to the melting point of copper,which is a true fireproof cable.
2 continuous production length,large section,good bending performance
●Continuous production length is long
The production length of the cable is not limited by the processing technology and production equipment,and fully meets the power supply length.The longest can be produced to 2000 meters.
●Large cross section
The cable conductor is formed by stranding a plurality of single wires,which greatly increases the flexibility of the conductor,and the stranded conductor has good continuity of production,long processing length,and can reduce the number of joints,and the cross section of the single core cable can be Up to 800mm2.
●Good bending performance
The copper sheath is embossed to increase the flexibility of the cable and the bending performance is good.
3 large current capacity,waterproof
●Large current carrying capacity
When the cable is normal,the conductor temperature can reach 180°C.Under the premise of the same conductor cross section,the current carrying capacity far exceeds the conventional cable.
The cable is protected by a sealed non-magnetic metal tube and its water resistance is excellent.
4 with explosion-proof,anti-corrosion,no electromagnetic interference characteristics
Since the cable is made of copper sheath,and the cable is burned,the filling layer is expanded and compacted,and the combustible gas and flame cannot reach the electrical equipment connected to the cable,so the cable has explosion-proof characteristics.
●Good corrosion resistance
Because copper has good corrosion resistance,no additional protection is required in normal use environment.Under special environmental conditions,such as the environment with strong corrosive effect on copper,only a layer of low smoke is added outside the cable.The halogen-free outer protection can achieve corrosion resistance.
●No electromagnetic interference
Because the cable is laid under the shielding of the copper sheath,it will not interfere with the signal and control line when it is laid together with the information and control lines.
Second,WTTEZ inorganic composite insulated fire-resistant cable and BTTZ mineral insulated cable technology comparison
Project high flame retardant fire resistant cable mineral insulated cable BTTZ inorganic composite mineral insulated cable WTTEZ
Combustion performance flame retardant(Class A)non-combustible and non-combustible
Tobacco smoke smokeless smokeless
Halogen,high halogen,halogen free,halogen free
The fire resistance characteristics reach Class B 750°C-800°C 90min over Class A 950°C-1000°C 3h over Class A 950°C-1000°C 5h
Spray test cannot pass through
Vibration test cannot pass through
The length of production is required to be unlimited.The length of each section is not more than 50 meters.There is no limit on the length.No joint is needed in the middle.
The laying conditions are unrestricted and fixed,and it is not movable and unlimited.
Inorganic composite insulated fire-resistant cable(WTTEZ)has excellent fireproof performance,long production length,good bending performance,and can completely replace BTTZ cable in performance.It has excellent high temperature resistance,fireproof performance,good bending performance,advanced technology,simple installation,double stability of electrical insulation and cable structure under high temperature ignition environment,and is incomparable with traditional mineral insulated cables.At the same time,WTTEZ cable has advanced manufacturing technology and simple installation.Under the same conditions,its comprehensive cost is significantly lower than that of mineral insulated cable(BTTZ).
BTTZ mineral insulated cable structure and performance characteristics
1.BTTZ cable structure
Its structure is:1.solid conductor;2.magnesium oxide mineral insulation;3.copper sheath
2.BTTZ cable performance characteristics
The advantage of the BTTZ cable is that it is a non-combustible cable with excellent water resistance and radial waterproof and moisture-proof function due to its all-inorganic structure.
The disadvantages of BTTZ cable are:1 Firstly,it is not suitable for mobile occasions.Once the copper tube breaks,the insulation performance will drop rapidly,and the insulation performance will drop sharply at high temperature,so it is not suitable for large-scale use in engineering;2 secondly,this cable is insulated by magnesium oxide.Easy to absorb moisture,cable longitudinal moisture protection requirements and protection from metal sheath damage is particularly important,the use of sealant at the end,will seriously affect the service life;3 further manufacturing process also limits the length of cable manufacturing,resulting in increased joints,joints Waterproofing is also very difficult,often due to water in the joint,resulting in insulation resistance is not acceptable.
YTTW mineral insulated cable structure and performance characteristics
1.YTTW cable structure
1 copper conductor 2 high temperature(1375°C)does not burn inorganic(mineral)insulation with insulation 3 outer copper sleeve
2.YTTW cable performance characteristics
1 Advantage is a metal sheathed inorganic mineral insulated cable.Is a flexible fireproof cable,1,fire resistant
The two materials copper and magnesium oxide used in mineral insulated cables are inorganic.This cable will not burn or burn,and will continue to operate under conditions close to the flame.The copper sheath melts at 1083°C,while the magnesium oxide insulation cures at 2800°C.
2,high operating temperature
Mineral insulated cables are resistant to continuous operating temperatures up to 250°C.However,in an emergency,the cable can continue to operate for a short period of time at a temperature close to the melting point of the copper sheath.
Inorganic materials used in mineral insulated cables ensure stability,long life and fire resistance.
Insufficient:YTTW cable,first of all,its sheath is made of copper sheath,and the production cost increases with the large amount of copper.Cables with larger cross-sections are still harder and less flexible,so larger sections(greater than 630mm2)are not yet available and cannot meet the system's high current requirements.
The copper pipe of the cable is continuously welded in a longitudinal package,which is easy to fall off.When the China Pavilion of the Shanghai World Expo is used,a cable burst accident occurs due to the bending radius.At present,the China Pavilion has been hit hard and the risks are high.It remains to be seen.
Comparison of performance and performance of YTTW cable and BTTZ cable
1.YTTW--flexible fireproof cable;
BTTZ-rigid fireproof cable.
2,YTTW--cable manufacturing length is unlimited;
BTTZ--The cable is limited by the manufacturing process,the conductor cross section is small,and the production length is short.
3,YTTW--meet the requirements of design and construction acceptance specifications;
BTTZ--It is difficult to reach the"Code for Design of Power Engineering Cables""The middle of cable lines should not be'connected"is mandatory,"Code for Electrical Design of Civil Buildings"and"Code for Construction and Acceptance of Cables for Installation of Electrical Installations"Avoid intermediate joints,"reducing cable joints"requirements.