The equation you are looking for is amperage = kva x 1000/1.73 x voltage.
150 x 1000 = 150000/1.73 x 480 = 150000/830 = 180 amps for primary side of transformer.
150 x 1000 = 150000/1.73 x 240 = 150000/415 = 361 amps for the secondary side of the transformer.
The electrical code requires Transformers and motors conductors to be sized at 125% of the rated amperage.
So 180 x 125% = 225 amps, and 361 x 125% = 451 amps.
A 3/0 copper conductor with an insulation factor of 90 degrees C is rated at 225 amps.
A 600 MCM copper conductor with an insulation factor of 90 degrees C is rated at 475 amps.
Parallel 3/0 copper conductors with an insulation factor of 90 degrees C will give a capacity of 450 amps.
There is no 2 phase 240 volt secondary.
Any two legs of a three phase system are classified as single phase. Single phase 240 volts can be obtained from any of the following transformer tap connections, A-B, B-C, C-A.
The ground wire is based on the current carrying capacity of the feeder conductors. To calculate the feeder conductor size the transformer amperage must be calculated. To calculate the transformer amperage the primary and secondary voltages must be stated.
For a single phase connection a 400 MCM wire will be needed. For a three phase connection a 3/0 wire will be needed.
You need to mention the Load connected to find the current.
An autotransformer is a transformer with at least two windings where a part of one winding (the common winding) is shared between both primary and secondary outputs.
You have to connect each phase (R,Y & B respectively) of earthing transformer zig zag winding to each phase of power transformer delta secondary respectively. Then the zig zag winding of earthing transformer star point to be earthed.
D is for the primary winding -> triangle Y is for the secondary winding -> star N -> secondary grounded 5 -> phase difference 180 degrees/5 = 30 degrees
This is the rated output of the transformer, obtained by multiplying the rated secondary voltage by the rated secondary current. And it's 'kV.A', not 'kva'.
A: The only way can be possible if the transformer is an isolation type. Yes, you can put the input into the secondary side. This will create a step-up transformer.
The voltage phase shift between primary and secondary connections in a transformer is 180 electrical degrees.
it has three primary windings & three secondary windings.
For a transformer, the turns ratio always applies between its primary and secondary windings. So the turns ratio for a three-phase transformer is the ratio of primary to secondary phase voltages, not between line voltages.
A single-phase transformer works with a single-phase supply, while a 3-phase transformer is used with a 3-phase supply. A single-phase transformer has 2 wires on the primary and secondary (ignoring taps) while a 3-phase tansformer has 3 or 4 wires on the primary and secondary.
To eliminate certain harmonics.
This 480-v three-phase transformer probably has a 208-v three-phase secondary which has 120 v from each line to neutral. In that case the primary current is 0.433 times as much as the secondary current, so 100 amps in the secondary means 43.3 amps in the primary.
First find the ratio of the transformer. 6600/220 volts. Second find the secondary current, I = W/E, 99000/220. Third divide the secondary current by the transformer ratio. The answer will be the primary current. To check your answer (W (or VA) = V x A) multiply the primary current times the primary voltage and the secondary current times the secondary voltage and they should both equal the transformer's kVA.
The # of windings in a transformer are based on the primary and secondary voltages the transformer is rated for not the way the windings are connected.
The phase relationship between the primary voltage and the secondary voltage of a transformer is 180 degrees (typically) on single phase transformers. If working with three phase transformers, a zero phase shift is often used in Y/Y grounded transformers. If the transformer is wired Delta / Wye, the phase shift will be 30 degrees. I've seen transformers with a phase shift of 150 as well (quite abnormal, but it exists!) due to the starring and a delta / wye configuration. If you are looking at a transformer phasor diagram, this will show the phase shift between primary or secondary (three phase transformers). For single phase, there should be a drawing showing polarity markings - what goes in the polarity marking on the primary comes out on the secondary polarity marking.
primary winding flux links with secondary winding produses voltage across the secondary winding
200 and 100