POWER TRANSMISSION







Why high voltage is preferred in T&D?

TYPES OF TRANSMISSION LINES :



SOIL CLASSIFICATION :



TYPE OF TOWERS USED IN CONSTRUCTION OF TRANSMISSION LINES:



CIRCUITS IN TRANSMISSION LINES:



Maximum Permissible Tensile Strength for Cables:



ACCESSORIES REQUIRED FOR CONSTRUCTION OF TOWERS:




  • STUB TEMPLATE.
  • STUB TOWER PARTS
  • BOLT & Nuts
  • Measuring tape
  • Water level indicator


TOWER ACCESSORIES

  • TPHASE PLATE
  • CAUTION PLATE
  • CIRCUIT PLATE
  • NUMBER PLATE
  • ANTI CLIMBING DEVICE


CONDUCTOR ACCESSORIES:



  • MID SPAN COMPRESSION JOINS
  • REPAIR SLEEVES
  • VIBRATION DAMPERS
  • PREFORMED ARMOUR JOINTS
  • P G CLAMPS



400KV 220KV 110KV 66KV
No. of Disc Insulators in suspension string 23 14 7 4
No. of Disc Insulators in Tension string 2/25 16 8 5


HEIGHT OF THE TOWERS (Mtr):


A B C D
400KV 46.3 46 46 46
220KV 32.8 32.6 33 33.1
110KV 24.5 24.7 24.6 24.9
66KV 19.4 18.9 19.4 20.6

WEIGHT OF THE TOWERS (MT):


A B C D
400KV 9 15 18 23
220KV 3.4 5.3 6.2 7.6
110KV 2 3.2 3.3 4.7
66KV 1.3 1.6 1.9 2.6


Conductor spacing (Mtr):


400KV A B C D
Vertical 8 8 8 8
Horiozontal 14.8 17.3 18.3 19.2

220KV A B C D
Vertical 4.9 4.9 5 5
Horiozontal 9.2 10.0 11.2 10.4

110KV A B C D
Vertical 3.2 3.2 3.2 3.3
Horiozontal 6.0 6.0 6.8 8.8

66KV A B C D
Vertical 2.3 2.1 2.2 2.4
Horiozontal 4.2 4.4 4.8 6.2




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