## What is the complex power in three-phase system?

This quantity S is called the complex power. The magnitude of complex power i.e. |S| = (P2 + Q2)½ is known as the apparent power and its unit is volt-ampere. This quantity is a product of absolute value of voltage and current.

## How do you calculate complex power?

The Complex sum of Real Power (P) and Reactive Power (Q) is known as Complex Power which can be expressed like S = P+jQ and measured in terms of Volt Amps Reactive (generally in kVAR).

**Which is the power equation for 3-phase system?**

For 3-phase systems, we use the following equation: kW = (V × I × PF × 1.732) ÷ 1,000.

**What is complex power flow?**

When θ is positive, the current lags behind voltage. This is a convenient choice of sign of θ in power systems where loads have mostly lagging power factors. Complex power flow in the direction of current indicated is given by. or.

### Why is complex power vi * Not Vim?

S^ = VI* is not “apparent power”, but “complex power”. Apparent power can be gained as an absolute value of S^, thus |S^| = S. Complex conjugate of current phasor is used because for S you need phase difference between the voltage phase and current phase.

### What is the formula for three phase real power in three phase star connected system?

Three-phase Voltage and Current

Connection | Phase Voltage | Phase Current |
---|---|---|

Star | VP = VL ÷ √3 | IP = IL |

Delta | VP = VL | IP = IL ÷ √ |

**Why do we use 1.73 for three phase?**

In a three phase circuit, the use of the constant 1.732 results from the fact that not all three phases are producing the same amount of power at the same time. Each phase’s voltage and current move through zero at different times.

**What is the unit of complex power?**

volt-amperes

Complex power, denoted by S, is the vector sum of real power and reactive power. Apparent power, denoted by |S|, is the magnitude of complex power. It uses the unit volt-amperes (VA) rather than watts.