Understanding 3 phase sequencing

[ardhuru]

I'm working on a system that has to be polling the 3 mains phases, and to visualize the waveform, I created an Excel spreadsheet, where the 3 phases in sequence would be as denoted by the black, red and blue columns (using the US color convention), each 120 degrees out of phase.

Now, looking at the data, I would have expected the waveform to be 3 sign waves, in the sequence Black-Red-Blue, but they come out Black-Blue-Red. I found out another page that does something similiar at http://en.wikipedia.org/wiki/Image:T...e_voltages.png , and sure enough the sequence is Black-Red-Blue.

This has me perplexed. When I plot 3 waves, shouldnt they come out in sequence? (0 degrees-120-degrees-240 degrees)

I might be doing something entirely foolish here, and would greatly appreciate any help.

Regards,

Anand