Two phases to house - loss of neutral
in [Repair]
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From: terryc on 26 Nov 2009 10:19 On Thu, 26 Nov 2009 22:12:24 +1100, Phil Allison wrote: >>> Would the two utility meters correctly reflect the energy I consumed? >> >> **Briefly, yes. > > ** Indefinitely, actually. Yep, that is how 415VAC is obtained.
From: Van Chocstraw on 26 Nov 2009 16:46 Sylvia Else wrote: > I have to phases of power supply to my house - so three power lines, two > phases plus neutral. > > I've on occasion wondered what would happen if we lost the neutral line. > It seems to me that we'd then have the voltage between the two phases > across two sets of appliances, one set attached to one phase, and the > other set attached to the other phase, with the two sets in series as a > result of their common connection to the neutral wire. Since the two > sets are unlikely to represent equal loads, the net result would be a > large overvoltage on one set of appliances. > > My electrician says it's not an issue, but I can't see why. > > Any thoughts? > > Sylvia. With the exception of some pump motors, nothing in the house runs on 220. Even the stove splits 110 to the burners and 110 to the oven. No neutral and no 110's to anything.
From: Sylvia Else on 26 Nov 2009 18:33 terryc wrote: > On Thu, 26 Nov 2009 22:12:24 +1100, Phil Allison wrote: > > >>>> Would the two utility meters correctly reflect the energy I consumed? >>> **Briefly, yes. >> ** Indefinitely, actually. > > Yep, that is how 415VAC is obtained. But is it how it's metered? I haven't gone through the math, and I'd overlooked the fact that each meter sees a power factor of less than one, so I can't say now whether I think the meters would read correctly. But if there's a way of looking at the problem that makes the answer obvious, I've yet to see it. Sylvia.
From: who where on 26 Nov 2009 19:25 On Thu, 26 Nov 2009 16:46:51 -0500, Van Chocstraw <boobooililililil(a)roadrunner.com> wrote: >Sylvia Else wrote: >> I have to phases of power supply to my house - so three power lines, two >> phases plus neutral. >> >> I've on occasion wondered what would happen if we lost the neutral line. >> It seems to me that we'd then have the voltage between the two phases >> across two sets of appliances, one set attached to one phase, and the >> other set attached to the other phase, with the two sets in series as a >> result of their common connection to the neutral wire. Since the two >> sets are unlikely to represent equal loads, the net result would be a >> large overvoltage on one set of appliances. >> >> My electrician says it's not an issue, but I can't see why. >> >> Any thoughts? >> >> Sylvia. > >With the exception of some pump motors, nothing in the house runs on >220. Even the stove splits 110 to the burners and 110 to the oven. No >neutral and no 110's to anything. Ummmm ... The O/P is in AUSTRALIA, where the supply is nominal 230V single phase, NOT in Merka like you presumably are.
From: PeterD on 26 Nov 2009 20:54
On Fri, 27 Nov 2009 10:33:40 +1100, Sylvia Else <sylvia(a)not.at.this.address> wrote: >terryc wrote: >> On Thu, 26 Nov 2009 22:12:24 +1100, Phil Allison wrote: >> >> >>>>> Would the two utility meters correctly reflect the energy I consumed? >>>> **Briefly, yes. >>> ** Indefinitely, actually. >> >> Yep, that is how 415VAC is obtained. > >But is it how it's metered? > >I haven't gone through the math, and I'd overlooked the fact that each >meter sees a power factor of less than one, so I can't say now whether I >think the meters would read correctly. But if there's a way of looking >at the problem that makes the answer obvious, I've yet to see it. > >Sylvia. Do it the old fashioned way: make a test! Can't be that difficult, can it? |