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My SEL relay doesn't show the same harmonics as the fluke meter. Could the harmonics I measured with the Fluke meter be picking up the harmonics from either the CenterPoint city circuit or possibly the induced circulating current?

Absolutely, we have corrected one circuit (CGR3) and hope to correct 1 other in the next few months. The colored lines indicate overhead neutrals. It is difficult to describe, the circled numbers are our circuits (CGR1,CGR2,CGR3). The ones marked CP are CenterPoint city circuits. Originally...

When I first connected the meter, I had it set for Delta. When I corrected that I also checked the HZ. I don't understand why it shows as 50HZ on the screen shot.

I will see what I can find or create as it is difficult to describe. When you say Ring arrangements, are you talking about downstream ring bus? Unfortunately the Fluke manual doesn't give specific information in regard to which arrows are which values. I am too inexperienced in interpreting...

Unfortunately, I am not very experienced with phasor diagram other than to check meter connections are correct. I used a Fluke 435 II on each phase and the pole ground wire for each set separately. The meter is 1kv and under so I could not use the voltage leads but it still shows up on the...

I absolutely agree with this point, the problem is that there is a 1/2 mile run of overhead where the CenterPoint city circuit does not have its own overhead neutral.

Waross, Thanks for the input. I really appreciate all the input.

So, the pics in the original post were on circuit CGR1. That is the circuit that had a splice failure again on 3-15-23, so all building loads have been on circuit CGR2. The following pics are form readings this morning.

Thanks for all the replies. I will attempt to address all the questions below: No sure what you mean by " Path for other ground sources." Our substation transformers (2-33 MVA) are 138kv Delta to 12.470KV Wye. They leave our substation underground to the Utility substation that the circuits...

I work at a large University in Texas. When the electrical deregulation happened here the utility built us our own 138kv/12,470kv substation. Ever since we have had issues with our concentric neutrals burning up on our pole tops and splices burn up in our manholes every few years. Although my...