Power Cables
Techno Flex Cables boasts of one of the best qualities in the market. It not just manufactures, but also exports these Power Cables from its Mumbai factory. The company also offers engineering assistance to design cable products to different companies so that they can optimize the unique properties of different Power Cables required for their jobs.
A power cable is specifically designed for transmitting power. It even suffices the purpose of distribution. It comprises at least one independently protected electrical conveyor, typically kept intact with a general sheath. The product is utilized for transmission and appropriation of electrical power.
The underground links enjoy a few benefits, for example, these are less obligated to harm through storms, lightning, low support cost, a lower opportunity of issues, the much modest voltage drop, and a superior outward presentation.
Out of all brands Technoflex Cable has claimed a niche in the electrical conveyor industry. A wide product portfolio is bound to keep their ahead of competitors.
Techno Flex Cable is one of the best Power Cables manufacturer, Power Cables exporter, Power Cables supplier in Mumbai India. We serve this product in all over countires. If you want this Power Cables then please order Now !
Construction Details :
CONDUCTOR :
Plain bright annealed copper / alluminium, solid / stranded conductor confirming to IS: 8130: 1984.
INSULATION :
Type A, B, & C (HR) grade according to IS: 5831 : 1984 amended up dated.
INNER SHEATH :
Inner sheathing shall done by extrusion or by PVC tape binding that laid up cores shall not loose and prevent to water entering.
ARMOUR :
Gl armour wire / strip provides not only mechanical support but also earthing. The material use an according to IS : 3975 : 1974 amended up dated.
OUTER SHEATH :
Extruded STI / ST2(HR, FRLS, Halogenfree FRLS) type PVC is used according to IS : 5831: 1984.
APPLICATION :
In Thermal Power Station; Petrochemical Refineries; Steel & Cement Plant; Distribution System; Digital Control and Monitoring & Information systems; Air Ports; Building Towers; etc.
Techno Flex manufacture heavy duty Power Cable comprising of cores Single / Two / Three / Three & Half / Four Of Alluminium Conductor, PVC Insulated cores laid up, PVC Inner Sheathed OR PVC tape binding, GI wire / Strip Armoured & overall PVC sheathed cable confirming to IS : 1554 : Part-I.
Basic assumption for Current ratings :
- Max. Conductor Temp. : 70°C
- Thermal resistivity soil : 150°C CM/W
- Thermal resistivity of rvc : 650°C CM/W
- Ground temperature : 30°C
- Amb. air temperature : 40°C
- Depth oflaying : 75 cm (highest pt. of cable laid)
Rating Factors :
- Rating Factor for depth of laying Twin & Multicore Cables
- Rating Factor for the Single Core Cables (AC) in the formation in Air Applied to the corresponding ratings for trefoil groups in air.
- Rating Factor for variation in underground temperature for cables laid direct in ground & laid in duct.
- Rating Factor for variation in underground temperature for cables laid direct in ground & laid in duct.
| Depth Of laying cm | upto 25mm2 | Above 25mm2 & 300mm2 | Above & 300mm2 | Multicore |
|---|---|---|---|---|
| 70 | 1 | 1 | 1 | 1 |
| 90 | 0.99 | 0.98 | 0.97 | 0.99 |
| 105 | 0.98 | 0.97 | 0.96 | 0.98 |
| 120 | 0.97 | 0.96 | 0.95 | 0.97 |
| 150 | 0.96 | 0.94 | 0.92 | 0.96 |
| 180 or More | 0.95 | 0.93 | 0.91 | 0.95 |
| Nominal Area Of Conductor mm2 | Rating Factor |
|---|---|
| Upto & Including 185 | 1.07 |
| 240 | 1.10 |
| 300 | 1.08 |
| 400 | 1.04 |
| 500 | 1.00 |
| 600 | 1.00 |
| Ground Temperature 0C | 15 | 20 | 25 | 30 | 35 | 40 | 45 |
|---|---|---|---|---|---|---|---|
| Rating Temperature | 1.17 | 1.17 | 1.17 | 1.17 | 1.17 | 1.17 | 1.17 |
| Ground Temperature 0C | 15 | 20 | 25 | 30 | 35 | 40 | 45 |
|---|---|---|---|---|---|---|---|
| Rating Temperature | 1.33 | 1.25 | 1.16 | 1.09 | 1.0 | 0.90 | 0.83 |
Short Circuit Rating Of Alluminium Conductor Cable :
Techno Flex cables manufacturing method based on quality assurance plan & use of high standard raw material, therefore it withstand high Magnitude of short circuit rating. It is calculated as under:
where Ish - short circuit ratings in r.m.s. amp.
t - duration of short circuit in seconds
A - Area of conductor in sq.mm
Tabulated The Constant For Different Duration Of Short Circuits :
| Duration of Short Circuit in sec. | 1 Cycle = 0.02 sec | 2 Cycle = 0.04 sec | 5 Cycle = 0.1 sec | 10 Cycle = 0.2 sec | 25 Cycle = 0.5 sec | 50 Cycle = 1.0 sec | 2 sec | 3 sec | 4 sec | 5 sec |
|---|---|---|---|---|---|---|---|---|---|---|
| Short Circuit constant Per unit area | 536 | 378 | 239 | 169 | 107 | 75.7 | 53.0 | 43.6 | 37.8 | 34 |
Recommendation For Installation : Cables are the most important asset of any organization. Any damage to it will result in break down of the complete plant & machinery, hence proper attention should be paid while handling and laying them. So for its silent features which should be kept in view during installation as under:-
- Before laying the installation ofthe cable, It should be checked by meggar as a preliminary check against any probable fault.
- The drum should be always rolled in the direction of the arrow or opposite to the outside cable end.
- Avoid the possibility cable twist which will brutally damage the cable because cable have itself twisting force.
- Properly check the sequence of cores & no crossing of cores while connecting, also decide the direction in which the cable is to be pulled.
- Possible bending radius should be 12 times the overall diameter of the cable to be maintained. But at any case it should not be less than 8 times.
- In low temperature area the bending should not be very small radius because PVC compound become stiff & brittle and it shall get crack.
- All joints terminations armour wires & external metallic bonding should be connected to the earth, wherever possible armour at one end of the cable should be connected to main earth system at the supplying end by employing metallic connectors. Precautions should be taken to eliminate the chemical & by metallic corrosion ofthe earth connector.
- The design of the box & composition of the filling compound should provide an effective sealing against entry of moisture to conductor & annour connector.
- If hot pouring protective compounds are used, the temperature of the compound while pouring should not exceed 150°C.
- Where the cables are crossing the roads, the same should be laid in concrete ducts & avoid the sharp edges of concrete ducts in other hand cable may be damaged.
- We strongly recommend the user that after installation, 2KV DC voltage test should be carried out, through the each core before earthing.
