Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
By-Ambuj Mishra

11/22/2013

LEAP Infraasys Pvt. Ltd.

1
1- SLECTION OF CABLE
A- Type of cables and their Application.
B- Selction and planing of cable installation.

General

L...
SLECTION OF CABLE
A-Type of cables and their Application:- A power
cable is an assembly of two or more electrical
conducto...
2- PVC Cable- PVC Insulated power cable is
used to transmit and distribute power on the
power line.
3-XLPE cable- This typ...
B- Selction and planing of cable installation.
 General-Which type cable are required and measuring
the Length of the cab...


Operating condition

A-System voltage- It’s a maximum operating voltage
whether DC or AC.
B-Earthing Condition- In 3-Ph...






Intermittent load-If the cable is switch “on” and “off”
pariodically so the time b/w switch “off” and then “on” i...
Guidelines for cable laying and installationA- Selction of route It is integrated part of the t/m and distribution system...
B- Minimum bending redius- Minimum bending
radius is the radius below which the cable
should not be bent..

Note-At the jo...
Minimum recommended bending radius are given in
tableVOLTAGE RATING

PILC CABLES

PVC & XLPE CABLES

Single-Core

Multi-Co...
Meathod of cables laying and installation
A-Laying direct in groung1- Laying of cable and bedding of minimum 75mm soil or
...
3- The desired minimum clearance are as fallowsPower cable to control cables
: 0.2 m
Power cable to communication cables
:...
B- Laying on racks in air1- Iside the buildings ,industrial plant,generating station
and substation cable are generally in...
C- Laying cable on racks inside tunnel. Inside
tunnel cable are generally installed on racks fixed
to the wall.
The arrang...
PACKING, TRANSPORT & STORAGE
1- Cable are generally received wound on wooden
drump,both ends of the cable being easilly
ac...
4- The site chosen for storage of cable drums
should be well-drained and should preferably
have a concrets surface.
5- All...
FOR YOUR
ATTENTION

11/22/2013

LEAP Infraasys Pvt. Ltd.

17
Upcoming SlideShare
Loading in …5
×

Installation & maintenance of power cable

""Installation & maintenance of power cable""

  • Be the first to comment

Installation & maintenance of power cable

  1. 1. By-Ambuj Mishra 11/22/2013 LEAP Infraasys Pvt. Ltd. 1
  2. 2. 1- SLECTION OF CABLE A- Type of cables and their Application. B- Selction and planing of cable installation.  General  Load condition  Installation condition 2- GENERAL A- Guidelines for cable laying and installation. B- Meathod of cables laying and installation. -Laying direct in ground. -Laying on racks in air. - Laying cable on racks inside tunnel. 3- PACKING, TRANSPORT & STORAGE 11/22/2013 LEAP Infraasys Pvt. Ltd. 2
  3. 3. SLECTION OF CABLE A-Type of cables and their Application:- A power cable is an assembly of two or more electrical conductors, usually held together with an overall sheath. Types:1-PILC Cables- Paper insulated lead covered cables continue to be very popular where utility service is required for underground electrical distribution systems. 11/22/2013 LEAP Infraasys Pvt. Ltd. 3
  4. 4. 2- PVC Cable- PVC Insulated power cable is used to transmit and distribute power on the power line. 3-XLPE cable- This type of Power Cable is used for power transmission and distribution line.In comparison with PVC Insulated Power Cable, XLPE power cable is much better than. 11/22/2013 LEAP Infraasys Pvt. Ltd. 4
  5. 5. B- Selction and planing of cable installation.  General-Which type cable are required and measuring the Length of the cable rute.  Rute indicators-Indicators should be provided at an interval not exceeding 200m and also at turning points of the power cable rute.  Soil condition-The knowledge of the soil and environmental condition helps in selecting type of finish of protective covering of the cable and the rute of laying.  Nature of soil-The current carrying capacity of the cable is dependent on the thermal resistivity of soil and groung temperature. 11/22/2013 LEAP Infraasys Pvt. Ltd. 5
  6. 6.  Operating condition A-System voltage- It’s a maximum operating voltage whether DC or AC. B-Earthing Condition- In 3-Phase system it is necessary to know where the neutral points effectively earthed,or earthed through resistance. C-Load Condition-Actual load condition helps in choosing correct cross-section of conductor for cable. Load condition are as follows Normal Load- Its means current w/b flowing continuously through cable. 11/22/2013 LEAP Infraasys Pvt. Ltd. 6
  7. 7.    Intermittent load-If the cable is switch “on” and “off” pariodically so the time b/w switch “off” and then “on” is not sufficent to cool the conductor to the ambient temp. Short time load-Under these load condition the conductor is allowed to cool down to ambient temp. Installation condition- Method of laying,installation details such as thermal resistivity,soil resistivity dimension of trench,number,type,cross section area and the load of all power cable. Basically difficulties expected during installation is1- Mechanical Stress 2- Vibration 3- Railway,road and river crossing. 11/22/2013 LEAP Infraasys Pvt. Ltd. 7
  8. 8. Guidelines for cable laying and installationA- Selction of route It is integrated part of the t/m and distribution system.  For transporting the cable drumps to work site ,it is necessary to check the road condition ,in including turns and width. Specialy attention should be paid to the load bearing capacity of the bridge.  If possible cable should be laid along the footpath rather than the carriage way,the route should be as far as possible , away from parallel running gas,water pipes & telecommunication cable. 11/22/2013 LEAP Infraasys Pvt. Ltd. 8
  9. 9. B- Minimum bending redius- Minimum bending radius is the radius below which the cable should not be bent.. Note-At the joint & termination bending redius for the individual core should be above 12 times the diameter over the insulation. 11/22/2013 LEAP Infraasys Pvt. Ltd. 9
  10. 10. Minimum recommended bending radius are given in tableVOLTAGE RATING PILC CABLES PVC & XLPE CABLES Single-Core Multi-Core Single-Core Multi-Core Up to 1.1 Kv 20D 15D 15D 12D Above 1.1 to 11 Kv 20D 15D 15D 15D Above 11 Kv 25D 20D 20D 15D Note-D is outer diameter of cable C- Maximum permissible tensile strength for cableTensile strength must be considered during the installation process. It is the maximum stress that a material can withstand while being pulled. 11/22/2013 LEAP Infraasys Pvt. Ltd. 10
  11. 11. Meathod of cables laying and installation A-Laying direct in groung1- Laying of cable and bedding of minimum 75mm soil or sand at the bottem of the trench and covering it with additional soil or sand of minimum 75mm and protecting it by means of tiles, bricks or slabs. 2- The disired minimum depth of laying from ground surface to the top of cable is as followsHigh voltage cables.3.3kV to 11kV rating : 0.9 m High voltage cables.22kV to 33kV rating : 1.05 m Low voltage and control cables : 0.75 m Cables at road crossings : 1.00 m Cables at railwaycrossings : 1.00 m 11/22/2013 LEAP Infraasys Pvt. Ltd. 11
  12. 12. 3- The desired minimum clearance are as fallowsPower cable to control cables : 0.2 m Power cable to communication cables : 0.3 m Power cable to gas/water main : 0.3 m * The power cables should not be laid above the telecommunication cable. * For identification of power cables, the cable protective cover,such as bricks or RCC slabs may be sutaible marked by world “Power cable” . 4- Ducting blocks shouls be used where cables cross road & railway tracks. Spare ducts for future extension should be provided. The diameter of the pipe or duct should be at least 1.5 times the outer diameter of the cable. LEAP Infraasys Pvt. Ltd. 12
  13. 13. B- Laying on racks in air1- Iside the buildings ,industrial plant,generating station and substation cable are generally installed on racks fixed to the wall or supported from ceilling.Rack may be ladder or perforated type. 2- The vertical distance b/w the two racks should be minmum 0.3 m and the clearance b/w the first cable and the wall(if racks are mounted on wall)should be 25mm. 3- Cable laid on horizontal racks need be clamped at suitable intervals.The distance b/w the vertical clamps should not be more than 2 m. - The arrangement of cable tray as shown is figer. 11/22/2013 LEAP Infraasys Pvt. Ltd. 13
  14. 14. C- Laying cable on racks inside tunnel. Inside tunnel cable are generally installed on racks fixed to the wall. The arrangement as shown in fig. 11/22/2013 LEAP Infraasys Pvt. Ltd. 14
  15. 15. PACKING, TRANSPORT & STORAGE 1- Cable are generally received wound on wooden drump,both ends of the cable being easilly acceasible for inspection and testing. 2- The cable drums not be dropped or thrown from railway wagons or trucks during unloading operations.A ramp or crane may be used for unloading cable drums. 3- The arrows painted on the flange of the drum indicate the direction in which the drum should be rolled. 11/22/2013 LEAP Infraasys Pvt. Ltd. 15
  16. 16. 4- The site chosen for storage of cable drums should be well-drained and should preferably have a concrets surface. 5- All drums should be stored in such manner as to leave sufficient space b/w them for air circulation.During storage, the drum should be rolled to an angle of 90* once every three months. 11/22/2013 LEAP Infraasys Pvt. Ltd. 16
  17. 17. FOR YOUR ATTENTION 11/22/2013 LEAP Infraasys Pvt. Ltd. 17

×