Why in Hv transmission line as we see there are generally 6 or
more than 4 conductor wires are used instead of 4 i.e. 3 for
phase and 1 for neutral wire?????
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Answer Posted / siddhant
Transmission lines are generally delta connected, hence they
don't have neutral wire.They are generally of two types
Single Circuit, Double Circuit lines.Single circuit consists
of 3-Phases R,Y,B.Double Circuit just consists of 2 Single
circuit lines.For economizing the cost of transmission lines
it is tried to use as many Double Circuit towers as land
cost to build these towers are increasing day by day.Even 4
circuit towers are also in use at places which have 4x3=12
conductors.Above stands for 33KV,132KV & 220KV transmission
lines. The conductors used are ASCR(aluminum Conductor steel
reinforced) or AAAC(All aluminium alloy conductor).
For 400KV lines each phase consists of 2conductors generally
known as bundled conductors (ACSR/AAAC -Moose variant)i.e
total 6 conductors for Single ckt., 12 conductors for Double
Ckt.
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