Power Quality - A high Number of of Voltage Dips or Spikes

Sense Labs
1

How was your issue detected?:
I noticed the situation in Sense Labs

Did you noticed any other signs of this issue around your home?:
No

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I downloaded the CSV data and noticed that a dip threshold appears to be <110v, not the -10% (108v) suggested in the text. At 110v threshold I have 74 hits, at 108v I have 13 hits.

Where should this threshold really be to ignore the dips from starting motor loads?

I have a ground source heat pump that seems to be the major culprit. I have had it tested recently and it is performing within spec.

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@ofangonline,
A lot depends on how sensitive other equipment in your home is to magnitude and duration of voltage dips and swells.

https://www.powerstandards.com/tutorials/voltage-sags-dips-and-swells/

I think this Power Quality measurement also gives you an idea of how well regulated your power really is.

@RyanAtSense, @JustinAtSense,
Since there is a a standard IT Industry Tolerance Curves for power quality events, it might be worthwhile characterizing sags and swells vs that standard, though the standard is really for industrial usage.

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It turns out we had a dicey neutral.

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Great catch and that’s exactly the type of post-assessment (Power Analysis) data that Sense could likely use to go deeper — one might hope for future refinements and alerts: “You may have a dicey neutral”.
@JustinAtSense this seems like a good one to request data access on.

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We’re already on it, @ixu :slight_smile:

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