Trefas Industriell Effekt
Beräkningar för tunga industriella system. Hantera komplex √3-vektormatematik för motorer och anläggningens elcentraler.
Industrikonfiguration
Trefas AC
Resultatet uppdateras i realtid när du anger parametrarna.
Aktuellt resultat tar hänsyn till linjespänningsmultiplikatorn (√3 ≈ 1,732) och systemets verkningsgradsförluster. Lämplig för verifiering av motorns FLA.
Trefas Effektformler
Trefaseffekt ger 73 % mer effekt än enfas vid samma spänning och ström — med endast en extra ledare.
Aktiv Effekt (kW)
P = √3 × V × I × PF Faktorn √3 (1,732) tar hänsyn till 120°-fasförskjutningen mellan de tre strömvågformerna, vilket ger en jämn momentan effektleverans.
Skenbar Effekt (kVA)
S = √3 × V × I Skenbar effekt är den totala kapacitet som källan måste tillhandahålla, oavsett effektfaktor. Används för att dimensionera transformatorer och generatorer.
Understanding Three-Phase AC Power
Three-phase power is the standard for industrial and commercial electrical distribution. It consists of three sinusoidal voltages, each offset by 120°, that together produce a constant, smooth power delivery. This makes three-phase motors smoother and more efficient than single-phase equivalents — and allows a given amount of power to be transmitted with less conductor material.
Why √3 (1.732)?
The three-phase power formula uses the square root of 3 because of the vector relationship between line voltage and phase voltage. In a balanced three-phase system, line-to-line voltage (V_LL) equals √3 times the line-to-neutral phase voltage (V_LN). For example, 208V line-to-line corresponds to 120V phase voltage (208 ÷ 1.732 ≈ 120).
Three-Phase Advantages
- Constant Power Delivery: The three phases sum to a constant total at every instant — unlike single-phase which pulses at twice the supply frequency. This makes motors run smoother with less vibration.
- Higher Power Density: A three-phase system delivers 73% more power than single-phase at the same conductor size and voltage, making it far more economical for large loads.
- Simpler Large Motor Design: Three-phase induction motors have no starting capacitors or split-phase windings — the rotating magnetic field forms naturally from the three phases.
- Lower Neutral Current: In a balanced three-phase system, the neutral conductor carries zero current, saving conductor material in distribution systems.
Common Three-Phase Voltages
- 208V / 120V: US commercial — line-to-line / line-to-neutral. Common in office buildings and light industrial.
- 480V / 277V: US industrial standard. Used for large motors, HVAC, and industrial equipment.
- 400V / 230V: International (IEC) standard across most of Europe, Asia, and Australia.