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Figure 3.20(a) shows a three phase generator supplying a load through a three phase transformer rated 12 kV A 600 V 600 kVA. The transformer has per phase leakage reactance of 10%. The line to line voltage and the line current at the generator terminals are 11.9 kV and 20 A, respectively.

3. A single phase, 325 kVA, 11 kV 2.2 kV, 60 Hz transformer has the following equivalent circuit parameters referred to the high voltage side: R c = 57. 6 kΩ X m = 16. 34 kΩ R eq = 2. 784Ω X eq = 8. 45Ω (a) [15%] Draw the per unit equivalent circuit using the nameplate ratings as base values. Specify the values of the impedances in per unit.

Let's understand the concept of per unit system by solving an example. In the one line diagram below, the impedance of various components in a power system, typically derived from their nameplates, are presented. The task now is to normalize these values using a common base.

Here's a Calculator to Help You. Calculate 3 phase power by multiplying the voltage times the amperes times a power factor. The power factor adjusts the equation to allow for the effects of the 3 phase circuit. For 3 phase circuits, the power factor is the square root of 3 (about 1.73 if your calculator doesn’t have a square root function).

KVA Calculator is an online tool used in electrical engineering to measure the unknown quantity by two known quantities applied to the below formulas for single phase and three phase connection. To calculate KVA, you need to enter the known values of voltage and the current into the respective fields.

Electricity costs are based on kilowatts (kW), so divide watts by 1000 to convert to kilowatts (20,760 wats 1000 = 20.76 kW). Record the time the motor is in operation. For example, in a manufacturing plant, a 3 phase electric motor might run 8 hours a day, 5 days a week. This works out to an average of 173.3 hours per month.

How do you calculate amp draw if you have 3 phase volts and kw? ... Usually when a rate of current is stated on a 3 phase board it means per phase. Therefore, you woiuld be able to draw up to 200A ...

Z (per phase) = Real power 3 j Reactive power 3. The RHS is the per phase complex power for a balanced load. Since the LHS should be in units of ohms, you should reexamine what lead you to this equation. Consider an impedance Z with known complex power S delivered to it: [tex] \mathbf{Z} = \frac{\mathbf{V}}{\mathbf{I}} \\.

Three Phase Example: Using a 75 KVA Three Phase Transformer as a starting point. 75 KVA is equal to 75,000 VA. 75 KVA is equal to 75,000 VA. (K= 1,000) The full value in VA, 75,000 divided by 1.732 = 43,302, which is then divided by the Voltage 208V = 208.2 Amperes.

3.8 Power in Three Phase AC Circuits Since the phase impedances of a balanced star or delta connected load contain equal currents, the phase power is one third of the total power. As a definition, the voltage across the load impedance and the current in the impedance can be used to compute the power per phase.