Say I have these 3 phase angles

-177, -179, 2.01

How do I average them?

-177, -179, 2.01

How do I average them?

Say I have these 3 phase angles

-177, -179, 2.01

How do I average them?

-177, -179, 2.01

How do I average them?

- Hi, you have an unusual result.

I don't agree with John. You can't add the 2 in, but you can change one of the negative phases to positive, by adding 360. Then the average becomes:

-177+360, -179+360, 2.01, and average the three.

But, now you will have a problem at some other transition point. In general, we do averaging by converting mag-phase into re-im, and averaging in re-im first. - Oops, I see I forgot about those pesky negative signs....
**and**made a math error!

I was thinking that the +2 reading was just after the transition of -180....but that would really be +178; not +2. I'm not sure how you can achieve those results in a valid measurement unless it was very noisy.

When in doubt, just follow Joel's advice!

And if the last phase reading was 7 then the average would be (177 +179 + 187)/3 or 1deg.

Thats my $0.02