Electrical Engineering - Re: basic question about HID lamps and power issues

Author

Re: basic question about HID lamps and power issues

operator jay

2007-02-18, 1:25 pm

xpost to a.e.e

"danny burstein" <dannyb@panix.com> wrote in message
news:eod29s$73k$1@reader2.panix.com...
> I've seen lots of discussion about the
> harmonics and other issues from HID lamps (or
> more properly, tehir power supplies).
>
> When I was working at an ISP I noticed some very
> headachey readings when looking at the supply
> and neutrals for the racks, but we were well
> below the current ratings so left things as is.
>
> Anyway... I know just enough about this to realize
> I don't know enough, so I figured I'd better ask
> a couple of questions even if they sound foolish.
>
> In my residential building complex we've got
> about 1,000 apartments, and I doubt there's
> enough usage of CFLs or HIDs or switching power
> supplies to be a major issue.
>
> However, we have a standalone muliti-story garage, which is
> illuminated 24 hrs/day by about 35 kw of high pressure
> sodium luminaires (with another 5 kw or so at night) getting
> fed via 3 phase AC. There's perhaps one or two addiotional
> kw of demand for some office equipment and (fluorescent)
> lighting. And a short occassional kw when opening/closing
> the garage doors.
>
> This building is separately metered.
>
> If I ask the utilty if the wave forms are screwing
> up the meter readings, would they laugh me out
> of the room? Is there any valid issue here?
>
> Thanks.

Where are you? What type of meter (electro mechanical spinnig disk?
electronic?) In what way do you think the meter is getting screwed up
and why do you think this? What is the problem? How long has this
been going on and has something changed? What's a typical monthly
bill and what breakdown / other info is on it?

You can go ahead and ask the Utility about it. If your building
demands so much harmonic current that it is screwing up the metering
then you will probably be responsible for remedying the situation.

j

danny burstein

2007-02-18, 9:25 pm

In <E00Ch.40321$gT4.8815@newsfe18.lga> "operator jay" <none@none.none> writes:

[ various snipppage ]

>xpost to a.e.e

>Where are you? What type of meter (electro mechanical spinnig disk?
>electronic?) In what way do you think the meter is getting screwed up
>and why do you think this? What is the problem? How long has this
>been going on and has something changed? What's a typical monthly
>bill and what breakdown / other info is on it?

As I said, I was just begnning the checkout
on this based on the rumblings I had seen posted.

There's nothing specific to point to just yet. I
bascially just wanted to know whether it was worth
taking some time to get more info (I'd have to
convince the management of the complex to let
me look around...) or whether I'd better use
that time cleaning out my car.

>You can go ahead and ask the Utility about it. If your building
>demands so much harmonic current that it is screwing up the metering
>then you will probably be responsible for remedying the situation.

That specific building - the garage - has a load that's
almost entirely high pressure sodium fixtures, hence
my curiousity.

Thanks

--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]

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