Hello all,
Specs:
Open Delta (2)50kVA Transformers
The Customer uses motors frequently (208v and 240v)
They have a demand of ~100KW

I have recently ran into a situation where a customer is having power quality issues, after a new delta bank (distribution) was installed. They have stated that an older console loses power intermittently. "It is only for the older console, which runs 3 phase, 240 V, that we then transform to 1 phase, 380V." is the description of the main disruption. They have also noticed "some issues" with their A/C unit. Though they haven't went any deeper in detail.

What could be causing these kinds of issues?

 

Hello all,
Specs:
Open Delta (2)50kVA Transformers
The Customer uses motors frequently (208v and 240v)
They have a demand of ~100KW

I have recently ran into a situation where a customer is having power quality issues, after a new delta bank (distribution) was installed. They have stated that an older console loses power intermittently. "It is only for the older console, which runs 3 phase, 240 V, that we then transform to 1 phase, 380V." is the description of the main disruption. They have also noticed "some issues" with their A/C unit. Though they haven't went any deeper in detail.

What could be causing these kinds of issues?

Erratic connections (poor installation quality). Some other failure coincidentally occurring about the same time as the transformer installation. Have you confirmed voltages directly at the transformers during intermittency?

 

Erratic connections (poor installation quality). Some other failure coincidentally occurring about the same time as the transformer installation. Have you confirmed voltages directly at the transformers during intermittency?

So far, primary voltage and secondary voltage coming out of our system are within tolerance. However, we have not been able to check near the time of intermittence.