Answer / eng_entropy

I agree with Manya and adding that:-

1-HVDC transimission line have lower losses than Ac lines
for the same power capacity.

2-It is very easy to control the active power in the link
in HVDC systems.

3-HVDC system is the only way to make an exchange of power
between two different networks.


HVDC . . . High Voltage DC system

Answer / j@ru ( sati)

i am agree wiyh above all and adding that the ac
transmission is cheaper at a distance called breakdown
distance which is about 800-1000 km .above this distance of
transmission line dc is cheaper ..but it should be noted
that the initial cost of installation for dc is more than
ac.as rectifier station installation is costly.
thank you

Answer / virendra

Both transmission have there own advantages &
disadvantages..

However for Lond distance say 1000 Km distribution the DC
transmission is cheaper because of Line losses but in short
distance AC is cheaper because the Cost of AC DC coverter
Substation is very high.

Answer / rishav gaurav

Ty
pical
advantages
of
hig
h
voltage
DC
transmission over
hig
h
voltage
AC
transmission
are
listed
below
:
1.
No
stabilit
y
problems
due
to
transmission
line length
since
no
reactive
power
needs to
be
transmitted.
2.
No
limitation
of
cable
lengths for
underground
cable
or
submarine
cable
transmission
due
to
the
fact that
no
charging
power
compensation
needs
be
done.
3.
AC
power
systems
can
be
interconnected
employing
a
DC
tie
wit
hout
reference to
system
frequencies,
shor
t-circuit
power,
etc.
4.
High-speed
control
of
DC
power
transmission is
possible
because
the
control
ang
le,
a,
has
a
relatively
shor
t
time
constant.
5.
Fault
isolation
between
receiving
end
and
sending
end
can
be
dynamically
achieved
due
to
fast
efficient
control
of
the
hig
h
voltage
DC link.
6.
Employing
simple-control
logic
can
change
the
energ
y
flow
direction
ver
y
fast.
This
can
help
in
meeting
peak
demands
at
either
the
sending or the receiving station.
7. High reliability of thyristor converter and inverter
stations makes this mode of transmission a
viable solution for transmission lengths typically over 500 kms.
8. The right-of-way needed for high voltage DC transmission
is much lower than that for AC
transmission of the same power capacity.

Answer / thowsif

DC Transmision is Cheaper & most efficient than AC.

Answer / manya

dc transmission is cheaper above break down distance means
it is cheaper for long distance.

Answer / ch.phani

ac transmission is cheaper though the losses in this are
high compared to dc
because dc cannot be stepped up directly and so the the
inverters and rectifiers comes into picture which has to
deal the high powers (in the order of mw).asn so the cost
is high

Answer / m.stalin

ac is cheaper. i am agree with the above

Answer / ramanharikrishnan

A.C is Cheaper.

Answer / sym

in my opinion AC transmission is cheaper compared to DC.

losses due to DC transmission are more compared to AC
transmission.

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