Medium Voltage and Low Voltage Bus Ducts
Bus ducts instead of cables in a distribution system has many advantages.
• Bus ducts are less prone to faults unlike cables
• Bus ducts, being mechanically more strong, has better short circuit capacities
• Aging of the insulation in a bus duct is low compared to that in cables and the intermittent insulators can be replaced if required
• Though bus ducts occupy more space, they are more mechanically protected
• Bus bars offer better cooling and so is most ideal for higher current ratings
• Terminations can be done better with bus bars and if done properly, chances of failures at terminations are nil.
• The current carrying capacity of a cable is very much dependent upon the installation such as grouping , installed in air or trench etc.
• The value of a bus duct depreciates very less compared to that of cable and it can be re-installed elsewhere with modifications with less waste.
Types of Bus Ducts:
A. With Copper or Aluminium Busbars as required
B. Indoor or Outdoor types
C. Interleaved Bus Bar system for very large AC current carrying systems
Flexible Links : Either Fusion Welded Copper or Braided Copper Wire
Cu.Al Bimetal sheets : To eliminate galvanic corrosion at Copper to Aluminum connections.