Braided Thermocouple Cables Information
We have CCV line with a Single point triple extrusion and computerized sophisticated control and monitoring systems
. The CCV line was imported from Machinenbau Scholz GMBH & Co KG, a pioneer in this technology and have supplied more than 250 lines world over. The process commences with a compacted circular conductor being fed from the pay off stands into the extruder on elevated platform. The conductor passes through extruder's crosshead, it is covered first with semiconducting screen layer then the XLPE insulation, followed by the outer semiconducting core screen. This crosshead is specially designed to feed three compounds from three extruders at one point described as Singe point Triple extrusion.Thereafter, the extruded core enters and passes through vulcanizing line known as CCV line (Continuous Catenary Vulcanising) and the XLPE insulated core is cured in the process. In CV line inert atmosphere is maintained by the Nitrogen gas which is at high pressure and high temperature.
Different thermocouple types (e.g. J, K, T, E, etc) use different mixtures of metals in the wire.All this means that the cables to be used for instrumentation should be designed and manufactured very carefully, KEI with its meticulous efforts in maintaining quality, stringent in process control during manufacture and the knowledge of cable designing, is proud to say that it is capable of supplying instrumentation cables meeting any Indian/International standard or a specific requirement desired by project authority. The efforts done by KEI are reqarded by acceptance of our quality by the country's prime organisations such as NTPC, PDIL, EIL, BHEL, TATA's, IOCL, L&T, ABB, KRUPP Ind, BPCL., HPCL, ESSAR, SIEMENS, Electricity Boards, Reliance, IOTL, Mukand, Honeywell, etc.
The cables are manu-factured as per IS:8784, ANSI-MC 96. 1, B.S., ENI, DIN and customers specification.PVC insulation benefits the lifespan, usage, and even organization of thermocouple wire and other high temperature cable. In thermocouple wires, the insulation exhibits excellent resistance to outside forces including weather, oil, liquids and chemicals. By protecting and maintaining thermocouple wire, the insulation elongates the life of the product. The insulation used on the high temperature cable is usually color coded, which makes for easy identification.
XLPE means cross-linked polyethylene or vulcanized polyethylene. The basic material is low density polyethylene. Polyethylene is a thermoplastic material consisting of long chain of hydrocarbon molecules. At elevated temperatures these molecules tend to move relative to one another so that the material becomes increasingly deformable and will eventually melt at the temperature around 110oC.By means of process similar to the vulcanization of rubber the polyethylene molecules can be cross-linked. The process of cross-linking or vulcanization consists of producing chemical bonds at interval between the long molecular chain to give a "ladder" effect which prevents slippage between molecules. As a result of cross-linking the material becomes heat resistant and does not soften at higher temperatures. Further it has better resistance to stress cracking and good resistance to ageing in hot air. With the change of structure there is no adverse effect on electrical properties.
Advantages of "KEI" XLPE CABLES
* Dielectric losses are very small.
* Higher current carrying capacity.
* Higher short circuit rating 250oC. as against 160oC for PVC.
* KEI XLPE can retain flexibility down upto - 40oC.
* Jointing and Termination is easy.
* Light in weight.
* They are not prone to fatigue damages due to vibrations or loading cycles.
* Has better resistance to most chemicals, oils, acids, etc.
* Can be installed along cable routes without elevation limitations.
Braided Thermocouple Cables Information
By: Peter Razor
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