MANUFACTURING | PROCESS | QUALITY
High Tension cable plant is complete with heavy duty machines for wire drawing and conductor making, laying up, armouring , sheathing and packing.
Sriram Cables boosts of its having one of the most modern plant in india for manufacturring of HT cables with latest technologies like Single Point Triple extrusion CDCC (Completely Dry Cured and Cooled Curing) Process and Singe Point Triple extrusion.
We provide various sheathing options using PVC, HDPE, FRLS, ZHFR, PCP or CSP compound.
Sriram Cables manufacturing plant and process ensures high qaulity XLPE cables for the new age power sector and industry. Our modern plant takes full advantage of the new generation XLPE compounds which offer fast curing and superior electrical parameters, dimensional control and higher productivity.
Triple Extrusion and CDCC process ensure contamination free cores. All three layers are bonded and core has least eccentricity and ovality. Insulation itself is free of micro voids and with negligible moisture content.
To control the manufacturing process the line has been provided with many sophisticated instruments and servo controls all monitored by the computer. Important systems are X Ray Non touch sensors of SIKORA make for thickness and dimensional control. This system continuously measures the dimensions of insulated cores. Unit has capability to measure multilayer dimensions in all directions and record and analyse the data on line. CCV tube has a Touch Less Sag control system. This ensures no marks/lines on core unlike older lines.
Computerised control system ensures optimum efficiency, fast start up, synchronized operations of compound feeds, three extruders, CCV line gas temperature zones, pay off and takeup. Nevertheless our XLPE cables compare better than those produced with older plants when checked for Microvoids, Moisture content, PD levels, dielectric strength.
We have strict Quality plan and fully equipped Testing laboratory to ensure cables of best quality are produced as per the design and specifications prescribed. Cables have been type tested as per International Standards.
Sriram Cables offers variety of designs to suit different installations viz. Aerial Bunched cables, Water tight construction, Stainless steel armouring for Offshore and Ship installations etc.
Sriram Cables is manufacturing LT Power Cables with PVC or XLPE insulation of voltage grade upto 3.3 KV conforming to various Indian and International Standard Specifications.
CROSS LINKED POLYETHYLENE (XLPE)
CROSS LINKED POLYETHYLENE (XLPE) 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 110°C.
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 "SRIRAM CABLES" XLPE CABLES
Dielectric losses are very small.
11 KV & 33 KV Aerial Bunched cables are used for power distribution in cities where ground space is constrained.
Size ranges from 35 Sqmm to 400 Sqmm
Stranded aluminium conductor
Screened by an extruded semi conducting layer - XLPE Insulated.
XLPE (CROSS LINKED POLYETHYLENE)
Coloured polyester strip Red, Yellow and Blue, under copper tape
1KV Volt Grade are used for distributing power to individual consumers by utility service providers such as electricity boards and electricity distributing authorities. The cables are suspended overhead using electrical poles. The cables can be tapped intermittently from any required position, enabling them to be used in urban as well as rural areas.
Single Phase or Three Phase systems with or without Street Light line.
Phase or lighting conductor: Electrical grade Aluminium of H2 or H4 grade as per IS: 8130
XLPE with Sioplas Technique.
Ridges provided on the insulation of Phase Conductors: 1 ridge for the 1st phase, 2 ridges for the 2nd phase and 3 ridges for the 3rd phase. The Neutral phase may have 4 ridges if required.
COLOUR OF INSULATION
As the cable remains exposed to environmental elements such as UV rays from sunlight, the insulation is mixed with a small amount of carbon black to prevent the deterioration of polythene.
CONSTRUCTION OF CABLE
The phase conductor can be of single phase or three phases. A lighting conductor can be also incorporated for street lighting. A messenger conductor supports the weight of the cable and keeps the assembly strung under tension. Phase conductors are made of concentrically stranded Aluminium Wires having 7 or 19 wires.
Messenger conductors are made of a specially treated Silica, Magnesium and Aluminium Alloy having 7 or 19 wires. Phase and lighting conductors may be insulated with XLPE compound of Sioplas Technology. Messenger conductors are kept either bare or insulated. Phase and lighting conductors are sometimes twisted around the messenger conductor. In special cases a neutral conductor may also be provided separately. Generally, the messenger acts as earth and neutral.