# How do you calculate 3 phase current of a transformer?

## How do you calculate 3 phase current of a transformer?

the following figure presents a nameplate of a three phase transformer….Using the aforementioned formula, let’s confirm this rating:

1. Primary Voltages or High Voltages (H.V) is 11000 volts.
2. Primary Current (current on High Voltage side) is 5.25 amps.
3. KVA = (√3. V x I) /1000= (1.732 × 11000 × 5.25)/1000=100 KVA.

## How do you find the fault current of a transformer?

You can determine the Full Load Amps of a transformer with the following formula: FLA = VA / L-L Voltage x 1.732, so using the example above we get FLA = 1000000 / 480 x 1.732 or 1000000 / 831.36 = 1202.84 (note the conversion from kVA to VA, 1000 x 1000 = 1000000).

## How do you calculate amps per phase?

Divide the power consumption in watts by the line voltage multiplied by the power factor to find the amperage. For three phase circuits the power factor is the square root of 3. If your calculator doesn’t have a square root function, use 1.73 as an approximation of the square root of 3.

## Is 3 phase current rating per phase?

If we had 8000 watts and 400vac single phase the current would be: 8000/400=20 amps. Because it is three phase, then each phase will see about 20/3 which is roughly 7 amps per phase if it is set up as a Wye system.

## What is the voltage on each side of a 3 phase transformer?

The line-to-line voltage on each side of the three-phase transformer is √3 times the nominal voltage of the single-phase transformer. The main advantage of a Y/Y connection is that we have access to the neutral terminal on each side and it can be grounded if desired.

## How do you calculate the apparent power of a three-phase system?

The key to doing this is that the sum of power in each phase is equal to the total power of the system. For example, take a 400 V (V LL) three phase system with the following loads: phase 1 = 80 A, phase 2 = 70 A, phase 3 = 82 A the line to neutral (phase) voltage V LN = 400/√3 = 230 V phase 1 apparent power = 80 x 230 = 18,400 VA = 18.4 kVA

## What are the disadvantages of a delta connected three phase transformer?

One disadvantage of delta connected three phase transformers is that each transformer must be wound for the full-line voltage, (in our example above 100V) and for 57.7 per cent, line current. The greater number of turns in the winding, together with the insulation between turns, necessitate a larger and more expensive coil than the star connection.

## What is a common magnetic core three-phase transformer?

A common magnetic core three-phase transformer can also be either a core type or a shell type. Since the third harmonic flux created by each winding is in phase, a shell-type transformer is preferred because it provides an external path for this flux. In other words, the voltage waveforms are less distorted for a shell-type transformer than