Kilovolt-amps Calculation

Kilovolt-amps Calculation

Kilovolt-amps Calculation is a tool that finds the total power of the AC circuit in single or three phases using its volt and current amperes. Kilovolt-amps tell the power factor of the circuit called the ratio of real power concerning the apparent power.

What is meant by Kilovolt-amps?

Kilovolt-amps (KVA) are a unit of power of AC circuits which mostly used in electrical systems. It also shows the total power in an alternating current (AC) circuit that contains both real power and reactive power of the circuit.

The total value of kilovolt-amps depended on the certain value of the parameters of the circuit namely the voltage (V) and the current (I).

The mathematical formula of the kilovolt-amps is stated below.

KVA = (V × I)

Where,

• V = total voltage of the circuit in volts
• I = total current of the circuit in amperes

What is meant by a single-phase Circuit?

Single phase circuit shows the change in voltage and current polarity in a regular pattern. In a single-phase system, the power is delivered to the user’s circuit by a single framework.

Moreover, in a single-phase system is a single power line and a neutral line. The voltage between the power line and the neutral line generates the alternating current. The waveform of the voltage and current in a single-phase circuit is a sine wave.

What is meant by a Three-phase Circuit?

A three-phase circuit shows an electrical power distribution system or circuit with three separate alternating current frameworks and each phase difference of 120 degrees. In three-phase Circuits, three power lines and one neutral line which build efficient methods of power transmission and distribution.

In three-phase Circuits, the AC waveforms are in sinusoidal form and denoted as phase A, phase B, and phase C. These phases are cut off from each other by one-third of a cycle (or 120 degrees) and creating a continuous or smooth power flow.

How to evaluate the Kilovolt-amps?

Example 1:

Find the kilovolts-amps if the voltage of a single phase circuit is 10 volts and amperes is 20.

Solution:

Step 1:

Write the data from the given condition carefully.

V = total voltage of the circuit = 10(volt), I = total current of the circuit = 20 (amp), KVA =?

Step 2:

Write the formula of the KVA in detail.

KVA = (V × I)

Step 3:

Put the all values in the above formula.

V = 10(volt), I = 20 (amp),

KVA = (V × I)

KVA = (10 × 20)

KVA = 200

Example 2:

Find the kilovolts-amps if the voltage of a single-phase circuit is 30 volts and the amperes is 50.

Solution:

Step 1:

Write the data from the given condition carefully.

V = total voltage of the circuit = 30(volt), I = total current of the circuit = 50 (amp), KVA =?

Step 2:

Write the formula of the KVA in detail.

KVA = (V × I)

Step 3:

Put the all values in the above formula.

V = 30(volt), I = 50 (amp),

KVA = (V × I)

KVA = (30 × 50)

KVA = 1500