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Double Circuit tension tower
The substation is one of the important power distribution facilities in the power grid. It is mainly responsible for the tasks of conversion, transmission, distribution and control of electric energy in the power grid, so that the power grid can provide safe and stable power to various loads.
Double Circuit Transmission Line refers to the arrangement in which a total of six conductors are provided to make two different Transmission Circuit. In Double Circuit Transmission Line, there are two circuits each consisting of three conductors corresponding to three phases. Both the circuits in Double Circuit Transmission Line are mounted or run through the same Transmission Line. In Double Circuit Transmission Line, bundle conductors are mostly used.
A general thumb rule is that, if the number of conductor per bundle is 2 then it will be 220 kV line while if the number of conductor per bundle is 4 then it will be 400 kV line. This is general thumb rule and variation is expected.
Power supply using Double Circuit Transmission Line enables the transfer of more power over a particular distance. However, running two circuits in close proximity to each other will involve inductive coupling between the conductors. This needs to be taken into account when calculating the fault level and while designing the protection schemes. In case of Distance Protection of Double Circuit Line, a compensation for Mutual Coupling between the circuits shall be provided otherwise the Distance Relay may under-reach / overreach.