I am working with a customer on a project and we had a odd problem possibly come up.
What is the most realistic way to get a reasonable measurement or estimates of a utility power transformer secondary impedance? (customer side)
We are working with a 25 KVA 120/240 volt AC transformer with approximately 80 feet of 3/0 aluminum conductor going from one side of the transformer to the source and back again. 40 feet each line.
We are working with a 30 KW grid tie inverter and are getting it certified next week. I realize the secondary becoming the primary in this application will be responsible for some of it but still we would like to be able to factor in the impedance to the equation.
Being I work with Grid tie inverters of lower powers I have not needed to ever factor active line impedance into a system design. I simply have not had a GTI capacity that could push enough power back to get the line voltages to raise more than 2% at most at my farm.
But for certification and production references we need to be able to calculate what may happen with a large GTI hooked up to undersized wiring of long lengths with an undersized power transformer. That way we can simulate the condition and make possible control program adjustments to limit current and voltage if the GTI recognizes a problem like this while feeding back.
What is the most realistic way to get a reasonable measurement or estimates of a utility power transformer secondary impedance? (customer side)
We are working with a 25 KVA 120/240 volt AC transformer with approximately 80 feet of 3/0 aluminum conductor going from one side of the transformer to the source and back again. 40 feet each line.
We are working with a 30 KW grid tie inverter and are getting it certified next week. I realize the secondary becoming the primary in this application will be responsible for some of it but still we would like to be able to factor in the impedance to the equation.
Being I work with Grid tie inverters of lower powers I have not needed to ever factor active line impedance into a system design. I simply have not had a GTI capacity that could push enough power back to get the line voltages to raise more than 2% at most at my farm.
But for certification and production references we need to be able to calculate what may happen with a large GTI hooked up to undersized wiring of long lengths with an undersized power transformer. That way we can simulate the condition and make possible control program adjustments to limit current and voltage if the GTI recognizes a problem like this while feeding back.