# FON; what is the voltage on the top set of wires in a street supply

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As I understand it, the bottom set of wires in a street supply are
240/415V. So what V(s) are the top set of wires?

TIA.

Re: FON; what is the voltage on the top set of wires in a street supply

6.6 & 11 in older areas, 22 in metro and 33 in country areas.
The most common in the metro area is the 22,000V distribution feeder
running at up to 300Amps per phase near the substation but usually much
less than that.

Re: FON; what is the voltage on the top set of wires in a street supply

Should see the big towers  near me (St Marys) They have barbed wire on them
and signs (in picture form) that state that climbing the towers will kill
you.  OUCH...

Mitch..

Re: FON; what is the voltage on the top set of wires in a street supply

the big towers could be 66, 132 or 330 kV
let the idiots climb the tower - - it helps stop the inbreeds from
breeding

Re: FON; what is the voltage on the top set of wires in a street supply

hehe helps raise the national average IQ

Re: FON; what is the voltage on the top set of wires in a street supply

I've been informed that the big towers are 330KV (OUCH!)

Mitch..

Re: FON; what is the voltage on the top set of wires in a street supply

Mitchell wrote:

Highest voltage used in aus is 500kV, runs through NSW, VIC and SA
QLD uses 275kV and 330kV, Basslink runs at 400kV DC

Barbed wire and spikes stops people fiddling with the line, Climbs up
and touches a wire it will also trip the breakers and potentially cause
a lot of other problems. The line of course would also have to be put
out of service for a little while which would cost a huge amount of
money

For original question, distribution voltages used are 3.3kV, 6.6kV,
11kV, 22kV, 33kV and even 66kV is sometimes transformed directly down
to 240/415 on a pole transformer...

Most common voltage by far in aus is 11kV.  3.3 and 6.6 are old and
getting rare. 3.3kV is used in industry for larger motors and things -
carries a lot more punch than 415 but easier to handle than 11kV. VFD's
are available for 3.3kV but not 11kV as well...

Somes states use 22kV and some don't. Mainly used in rural areas but
also in newer towns and in areas which have been upgraded. 33kV is
mainly used as subtransmission and in rural areas  - all the equipment
costs significantly more than for 11 or 22kV. 22kV equipment only costs
marginally more than 11kV equipment

Re: FON; what is the voltage on the top set of wires in a street supply

:
: Mitchell wrote:
: > > the big towers could be 66, 132 or 330 kV
: > > let the idiots climb the tower - - it helps stop the inbreeds from
: > > breeding
: >
: > I've been informed that the big towers are 330KV (OUCH!)
: >
: > Mitch..
:
: Highest voltage used in aus is 500kV, runs through NSW, VIC and SA
: QLD uses 275kV and 330kV, Basslink runs at 400kV DC
:
: Barbed wire and spikes stops people fiddling with the line, Climbs up
: and touches a wire it will also trip the breakers and potentially
cause
: a lot of other problems. The line of course would also have to be put
: out of service for a little while which would cost a huge amount of
: money
:
: For original question, distribution voltages used are 3.3kV, 6.6kV,
: 11kV, 22kV, 33kV and even 66kV is sometimes transformed directly down
: to 240/415 on a pole transformer...
:
: Most common voltage by far in aus is 11kV.  3.3 and 6.6 are old and
: getting rare. 3.3kV is used in industry for larger motors and things -
: carries a lot more punch than 415 but easier to handle than 11kV.
VFD's
: are available for 3.3kV but not 11kV as well...
:
: Somes states use 22kV and some don't. Mainly used in rural areas but
: also in newer towns and in areas which have been upgraded. 33kV is
: mainly used as subtransmission and in rural areas  - all the equipment
: costs significantly more than for 11 or 22kV. 22kV equipment only
costs
: marginally more than 11kV equipment

As loads (Amps) increase due to higher infill housing densities and
cheap inefficient Chinese aircons, older areas with the lower
distribution voltages are being upgraded to the higher voltages.

Often transformers have dual windings to accept the higher voltages and
all it needs is the overhead line to have the insulators changed.

Older underground areas with "paper-lead" cables are being maxed out
with the higher current demands, damage from multiple faults and high
voltage fault testing / detection. these areas are often replaced with
new XLPE cables and upgraded to higher voltages, with the old cables
abandoned.

As for the basslink cable - how is anyone going to climb it?  Like. what
has it got to do with the price of eggs!

Re: FON; what is the voltage on the top set of wires in a street supply

11000 or more.

If you look closely at the devices they're hooked to and the poles you'll
sometimes see labels or warning plaques.

--

Bye.
Jasen

Re: FON; what is the voltage on the top set of wires in a street supply

I asked that question of an electrical engineer a while ago about
some high voltage transmission lines. The top wire was significantly
smaller in diameter than the other wires. He said it was a sacrifical
earth wire for protecting the high voltage wires from lightning strikes.

Re: FON; what is the voltage on the top set of wires in a street supply

In NSW they are increasingly tubes with fibe optic inside. My
understanding is the Transgrid (?) is becoming a big dark fibre provider.

Re: FON; what is the voltage on the top set of wires in a street supply

Hmm.. cool.... Is that what they mean by "broadband over powerlines"?   8)

Re: FON; what is the voltage on the top set of wires in a street supply

No.

Re: FON; what is the voltage on the top set of wires in a street supply

On Wed, 10 May 2006 15:39:52 +1000, Terry Collins

No, 230 and 400. But thats another story.