Re: [GTALUG] Transient Harmonics at home; was mysterious restarts
Here's a nice overview of common issues in balancing linear vs. non-linear loads at home. You wouldn't think your little cluster is part of the problem but it can be. https://www.mikeholt.com/technical-power-quality-harmonics.php Sent from mobile.
On 06/19/2016 12:52 PM, Russell Reiter via talk wrote:
Here's a nice overview of common issues in balancing linear vs. non-linear loads at home. You wouldn't think your little cluster is part of the problem but it can be.
https://www.mikeholt.com/technical-power-quality-harmonics.php
The article is a bit dated. In the last decade or so server power supplies and high end UPSs have been power factor corrected or made to look more like a linear load. This has mostly been because of how power is metered and charged for. Older switching supplies would end up with a power bill that was higher than the actual power used. So if you have a lot of lower end power supplies you could be paying for more power than your actually using. -- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin@netvel.net ||
On 19 June 2016 at 14:32, Alvin Starr via talk <talk@gtalug.org> wrote:
Older switching supplies would end up with a power bill that was higher than the actual power used.
I thought is was the other way around. Older supplies with a low power factor use more energy that what is metered and thus charged for. Newer supplies have power factor correction at the insistence of the power companies and governments, so you are charged for the real amount of power that you're using. -- Scott
At the moment I'm browsing an interesting article on detecting harmonic pollution on the grid. Here's a download link. https://www.google.ca/url?q=http://jds.elfak.ni.ac.rs/ssss2014/proceedingsAndPublication/separated%2520chapters/14%2520Single%2520phase%2520system%2520for%2520detection%2520of%2520harmonic%2520pollution%2520sources%2520at%2520power%2520grid.pdf&sa=U&ved=0ahUKEwiAqMW727TNAhUB0oMKHXzcDRc4MhAWCBcwBQ&sig2=31mY_elJTtEgvosjwdsR0g&usg=AFQjCNHleUXzuXrRPWIHOHvYJVNDfXAQig Sent from mobile. On Jun 19, 2016 2:47 PM, "Scott Allen via talk" <talk@gtalug.org> wrote:
On 19 June 2016 at 14:32, Alvin Starr via talk <talk@gtalug.org> wrote:
Older switching supplies would end up with a power bill that was higher than the actual power used.
I thought is was the other way around. Older supplies with a low power factor use more energy that what is metered and thus charged for. Newer supplies have power factor correction at the insistence of the power companies and governments, so you are charged for the real amount of power that you're using.
-- Scott --- Talk Mailing List talk@gtalug.org https://gtalug.org/mailman/listinfo/talk
participants (3)
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Alvin Starr -
Russell Reiter -
Scott Allen