Üç Fazlı Güç Nasıl Hesaplanır? (kW, kVA)
Active power in a three-phase system P = √3·U·I·cosφ, apparent power S = √3·U·I It is found with (U line voltage). For example, for 400 V, 63 A, cosφ 0.9, S ≈ 43.6 kVA and P ≈ 39.3 kW. The √3 coefficient disappears in single phase.
3F: P = √3·U·I·cosφ, S = √3·U·I·1F: P = U·I·cosφ
Example calculation: 3-phase 400 V, 63 A, cosφ 0.9 → S = √3×400×63 ≈ 43.6 kVA, P = 43.6×0.9 ≈ 39.3 kW, Q ≈ 19.0 kVAr.
Three-Phase Power Calculator (kW/kVA)
Calculate active (kW), apparent (kVA), and reactive (kVAr) power from voltage, current, and power factor.
Active power P
–
Apparent power S
–
Reactive power Q
–
Notes: 3F: P=√3·U·I·cosφ, S=√3·U·I · 1F: P=U·I·cosφ, S=U·I · Q=√(S²−P²). Values are calculated according to your inputs; U is the line (phase-to-phase) voltage.
How is it calculated?
- Select the system (1F/3F) and line voltage (V).
- Enter the current (A) and the power factor (cosφ).
- Press Calculate; P, S, and Q will be displayed.
Frequently Asked Questions
What is the formula for three-phase power?
Active power P = √3·U·I·cosφ; apparent power S = √3·U·I. U is the line (phase) voltage.
Why is there a coefficient of √3?
In a three-phase system, the √3 relationship between line and phase magnitudes comes from this; when written with line voltage and line current, √3 is included in the formula.
How to convert from kVA to kW?
Apparent power is multiplied by the power factor: P(kW) = S(kVA)·cosφ.
Related tools and services
This tool and its content are for general informational purposes only; they do not constitute a binding inspection/declaration of conformity. Definitive results will be determined through on-site inspection in accordance with relevant legislation and standards. Get a quote →