On Thu, 02 Jul 2009 15:41:12 +0100, James Salisbury wrote:

Hi,
An OT question for those west of the pond. I have just been on Holiday
in Montreal and have noticed that the local HV network is wired in Star

No different to this country. All system transformers are wired delta/star,
with the star point being connected to earth through a liquid resistance to
limit fault current. How else could the system be protected against earth
faults if there were no connection to earth?

and there are many instances of single phase extensions. What happens to
the LV when the HV neutral breaks?

There is no neutral conductor on the 11kv system. I'm guessing you saw an
aerial earthwire. Normally only used in the country on tower lines,

--
The Wanderer

Computers are incredibly fast, accurate, and stupid;
humans are incredibly slow, inaccurate and brilliant;
together they are powerful beyond imagination. ¡X Albert Einstein