Greetings,
I've been brushing up on my "power" knowledge.
I found this problem and solution but need a little clarification.
Problem:
" The following transformer is composed of 3 single phase transformers or pri:sec voltage ratio 480:120 volts. Each transformer is rated 4.5kVA. The voltage source is a balanced 3phase positive sequence source with VA - 277.1 (0 degrees) v.
Find the effective 3-phase turns ratio."
a = VLL_primary / (VLL_Sec) = (VLN_Pri / VLN_Sec) = 2.309
I guess first question -
In the solution
The 480 is labeled the LL_Pri while 120 is labeled LN_Sec
The LN_Primary is 277.1.
How do we know the 480 is the LL_Primary and how do we know the 120 is the LN_secondary?
Thanks
-Sparky
I've been brushing up on my "power" knowledge.
I found this problem and solution but need a little clarification.
Problem:
" The following transformer is composed of 3 single phase transformers or pri:sec voltage ratio 480:120 volts. Each transformer is rated 4.5kVA. The voltage source is a balanced 3phase positive sequence source with VA - 277.1 (0 degrees) v.
Find the effective 3-phase turns ratio."
a = VLL_primary / (VLL_Sec) = (VLN_Pri / VLN_Sec) = 2.309
I guess first question -
In the solution
The 480 is labeled the LL_Pri while 120 is labeled LN_Sec
The LN_Primary is 277.1.
How do we know the 480 is the LL_Primary and how do we know the 120 is the LN_secondary?
Thanks
-Sparky