Power Cables

The Utility of Power Cables

These are arranged and created by voltage, current to be conveyed, working most outrageous temperature, and justification behind applications needed by the client.

For mining, we give extra mechanical fortitude to POWER CABLES with twofold building up. For the clients of wind POWER CABLES all around, require versatile and UV protected interface with the mechanical outrageous sheath so we plan as indicated by their essential. Our fine items like power links are dealt with by specialists.

The underground connections partake in a couple of advantages, for instance, these are less committed to hurt through storms, lightning, low help cost, a lower chance of issues, the much unobtrusive voltage drop, and a predominant outward show.

Out of all brands Techno flex Cable has guaranteed a specialty in the electrical transport industry. A wide item portfolio will undoubtedly keep their in front of contenders.

Techno Flex Cables are one of the best Power Cables manufacturer, Power Cables exporter, Power Cables supplier in Mumbai, India. We are serve in all Asian, Gulf, and African countries efficiently. If you want this product please quote Now!

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

1. Max. Conductor Temp. - 70°C
2. Thermal resistivity soil - 150°C CM/W
3. Thermal resistivity of rvc - 650°C CM/W
4. Ground temperature - 30°C
5. Amb. air temperature - 40°C
6. Depth oflaying - 75 cm (highest pt. of cable laid)

Rating Factors

1. Rating Factor for depth of laying Twin & Multicore Cables



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



2. Rating Factor for the Single Core Cables (AC) in the formation in Air Applied to the corresponding ratings for trefoil groups in air.

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



3. Rating Factor for variation in underground temperature for cables laid direct in ground & laid in duct.

Ground Temperature 0°C	15	20	25	30	35	40	45
Rating Temperature	1.17	1.17	1.17	1.17	1.17	1.17	1.17



4. Rating Factor for variation in underground temperature for cables laid direct in ground & laid in duct.



Ground Temperature 0°C	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 :

Example: Short Circuit rating of 70 sq.mm area of conductor with short duration 0.5 sec = 70 x 107 = 7490A

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 :

1. Before laying the installation ofthe cable, It should be checked by meggar as a preliminary check against any probable fault
2. The drum should be always rolled in the direction of the arrow or opposite to the outside cable end
3. Avoid the possibility cable twist which will brutally damage the cable because cable have itself twisting force
4. Properly check the sequence of cores & no crossing of cores while connecting, also decide the direction in which the cable is to be pulled
5. 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
6. In low temperature area the bending should not be very small radius because PVC compound become stiff & brittle and it shall get crack
7. 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 of the earth connector
8. The design of the box & composition of the filling compound should provide an effective sealing against entry of moisture to conductor & annour connector
9. If hot pouring protective compounds are used, the temperature of the compound while pouring should not exceed 150°;C
10. 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
11. We strongly recommend the user that after installation, 2KV DC voltage test should be carried out, through the each core before earthing