The electrical component which connects a number of transmission lines operating at the same voltage is the-

Concept:

Busbar:

• A busbar is a strip or bar of Copper, Brass, or Aluminum that conducts electricity within a switchboard, distribution board, substation, battery bank, or other electrical apparatus.
• Its main purpose is to conduct electricity, not to function as a structural member.
• Normally bus-bar is rated in terms of current, voltage, frequency and short time current based on the application.
• Bus bar has the same voltage at every point.

Temperature rise in the Busbars:

• During the short-circuiting, the bus bar should be able to withstand the thermal as well as mechanical stress.
• The heat dissipation through convection and radiation during this short duration is negligible
• All the heat is observed by the busbar itself.

Additional Information 

• Power line conductors are either solid or stranded. Rigid conductors such as hollow aluminum tubes are used as conductors in substations
• Distributor – A distributor is a conductor from which tapings are taken for supply to the consumers.
• Service Mains – Service Mains is a small cable that connects the distributor to the consumer's meter.