iem3555 Phase A odd

[michael_franz]

TEAM:

Here is a screen capture of what we are reading for one of the iem3555 meters at a site.

Note that current A is a significantly higher than B or C ampere readings and the kW is negative.

Does anyone have a guess on why this would be?  All that I can come up with is either a bad sensor, the wrong sensor type on that phase or a problem with the meter itself.

Has anyone else witnessed this issue?

Sincerely,

Michael Franz l APC
Technical Consultant

[Yut]

Check wiring.

[michael_franz]

Yut:

Our electricians have checked the wiring.  I would suspect that if "A” were

backwards then it would read close to the rest in a balanced system but be

negative.

Here we are negative and over 40 times different than the other phases.

We believe that it is a malfunctioning sensor that is causing the issue.

Sincerely,

Michael