I tried checking all three phase CT secondaries with a fluke yesterday on each Main, with the tie open, closed, and with Main-A open and the tie closed so all load on B.
I pretty much measured 0.2 - 0.3A constantly. Which I am thinking is just noise. Because it never changed, there was roughly...
Wow. Thank you for doing that.
If it's the voltage variance on TRB between the phases, wouldn't you see the neutral current on that main breaker all the time?
The only thing is like I said there isn't an electronic relay looking at the transformer CT's or rather the main breaker CT's. Those...
Lets say the ratios being off a bit on TR-B is the problem.
Wouldn't there be neutral current on Bus-B all the time, if the voltages were off because of the varying ratios on each phase?
Let's say A phase voltage was slightly lower than B & C. Wouldn't A-Phase amps be slightly higher then for...
I have a spreadsheet with all the different tests we have done, and some of the values.
I think I will remove any plant info from it and attach it today, so maybe that will help.
I really appreciate the responses so far!
Based on most recent test data for the two Main Sub transformers.
TR-A
Expected Ratio = 19.167
Actual Ratios:
H3-H1/X0-X1 = 19.152
H1-H2/X0-X2 = 19.142
H2-H3/X0-X3 = 19.152
Measured Voltage:
VCA = 12590
VAB = 12600
VBC = 12540
TR-B
Expected Ratio = 19.167
Actual Ratios:
H3-H1/X0-X1 =...
bacon4life (Electrical)26 Sep 24 23:15
Are there any load tap changing transformers or voltage regulator? Perhaps phases on different transformer taps could cause neutral current.
No there is not either.
Thanks for the response!
Hello,
I'm new here.
I joined because I was searching for an answer to my question and found some threads on here that sounded like they answered it, but they didn't.
But at the very least it sounded like there might be someone on here that has experience with this issue, and can help.
So...
