220 KV CABLE LAYINGFROM SAKI TO SAHAR

Presented By-

ROUTE SURVEY:

Accurate measurement:

• It is essential to take exact measurement from start to end. It is useful for To find out total length of cable To find out length of HDP duct To find out length of FOP duct To find out length of major road crossing. To find out length of minor road crossing. To find out length of gate crossing. To find out length of bridge crossing.

Details of CABLE for ordering:

• Cable manufacturing company=NEXAN• XLPE Insulated 220 KV cable.• Length of conductor in single drum=500m.• Current carrying capacity of cable=950A• Total length of cable =2632m(for saki) 2572m(for narayan).

TRIAL PITS:

• A trial pit is an excavation of ground in order to study or sample the composition and structure of the subsurface, usually dug during a site investigation, a soil survey or a geological survey. Trial pits are dug before the construction.

• Trial pits are usually between 1 and 4 metres deep, and are dug either by hand or using a mechanical digger.

Joint bay:

• Joint bay is used for jointing the ends of cable.• The distance between two joint bay is 500 meter.• Total length of joint bay is 10 meter.• Total measurement of joint bay is shown in below fig.

Different layers of joint bay:

• Different layers used in joint bay such as- RR(Random Rabble)- 225*2 mm Layers. PCC- 75mm Earthing conductor 38 m Raft- 300mm Still bar for centring.

FIG.LAYERS OF JOINT BAY:

Specification of material used in joint bay: Earthing conductor-• for earthing of joint bay pure cupper conductor (0.2)is used.• For single joint bay 38 meter conductor is used.• 17 strands conductor used.• Each strand has 11 gauge dia.• Diameter of whole conductor is16 mm.• Structure of earthing conductor is below-

Steel Bar details:• Main steel=16mm dia.• Distribution steel=12mm dia.• Chairs=16mm dia.

FIG. OF JOINT BAY:

Trenching:A long, narrow cut in the earth for cable laying.

• we shall excavate the trenches to a width sufficient for satisfactory and safe working

• conditions and shall comply with all relevant Acts, Regulations and requirements of public

• or statutory authorities.• It shall excavate as necessary to provide the specified minimum cover but so as to• avoid damage or loss of support to, obstacles such as pipes, drains, cables and

other• utilities and services.• In general shall restore the area to be excavated to its original condition when• the excavation is complete. All excavations shall be completed in a timely manner

to• minimise disruption to all parties.• It shall provide all materials required for the excavation including, but not limited

to• pumping equipment, shoring, backfill, etc. The equipment must be provided for

the• entirety of the project.

Fig. of trenching-

ROAD CROSSING: In road crossing 200mm diameter pvc ducts are used.

Major road crossing Minor road crossing

Details of road crossing:

• Major road crossing:122.7 m A-K Road- 61m Marol-maroshi road- 20.4m Marol bhavan- 33.7m Makhawana road- 7.6m• Minor road crossing length:386.7 m

Cable laying:

Safety precaution takes for cable laying –• Use roller for pulling

Fig of cable laying: