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Thanks to everyone who replied. cuky2000, the transformer secondary is ungrounded causing the phase to ground unbalanced voltages. Thanks for the diagram. With that said I will state that the system is running normal. The unbalanced phase to ground voltages is due to the ungrounded secondary...

Thanks to everyone that has replied to my questions. It's a big help. jghrist, Just to clarify on what you stated in your first reply, are the phase to ground voltages I mentioned earlier common for an ungrounded secondary even if the voltages were recorded at the secondary terminals of the...

A Lineman approached me today asking my opinion on something. We have an open wye/open delta connected transformer bank and I have a few of questions. 1)Should the primary neutral point float or be grounded and why? I understood that if the connection is a wye-delta the primary neutral point...

We have recently upgraded our SCADA system to a Windows based dual master system. We chose Survalent Technologies. The new system has been online for 1.5 years. The customer support is second to none. Highly recommended!! If you have a technical design question most of the time you are talking...

waross, Thanks for the responses. To respond to your reality checks: I agree with the loads being different and there being a single phase load that was not on after cleaning. There may be a logical reason for the difference in loading. As they put their panel back online, a lot of motors had to...

jghrist, While the load was unbalanced I checked the voltage at the secondary terminals on the transformer and they were within 1-1.5 volts of each other. After we corrected the connection problems they are within a .5 volt of each other. Correct me if I'm wrong jghrist, but it wouldn't seem...

Readings prior to cleaning connections: A1:420A B1:552A C1:350A N1: 73A A2: 13A B2: 7A C2:130A N2:189A A3: 80A B3: 10A C3:235A N3:195A All voltages looked good. The 1, 2, & 3 notations on the phases do not associate with a particular conductor, they are just used for representation...

LioneHutz, Thanks for the information. I plan on having all of the connections taken apart and cleaned. I will let you all know the outcome. Thanks!

Thank you all for your response! To answer itsmoked's question, I have checked the voltage at both ends of the cable and its fine. Also, the cable is only significantly hot at the A-Phase connector on the transformer. I do believe there was a bad connection there. As you move away from that...

I'm a new engineer for an electric utility with limited experience and have stumbled on something that really puzzles me. While infrared scanning a padmount transformer located outside of a plant we noticed overheating of conductors. Let me explain the setup. This is a 500 kVA 208/120 volt...