Guides: 3-phase
Three-phase power systems are the standard for industrial applications. These guides explain how 3-phase power works, how to calculate it, and when to use it in your electrical designs.
About This Topic
Three-phase power systems are the standard for industrial applications. These guides explain how 3-phase power works, how to calculate it, and when to use it in your electrical designs.
Recommended Learning Path
- Learn the fundamentals of 3-phase power systems
- Understand voltage relationships and phase angles
- Calculate current, power, and kVA for 3-phase loads
- Apply 3-phase calculations to motor and equipment sizing
- Explore power factor and efficiency considerations
Related Calculators
Use these professional calculators to apply the concepts covered in the 3-phase guides:
3-Phase Power Calculator
Calculate three-phase current, kW, and kVA for industrial electrical systems.
Use ToolFactory Load Calculator
Determine total electrical load, current, and breaker ratings for industrial facilities.
Use ToolTransformer Size Calculator
Calculate recommended transformer kVA rating based on load and power factor.
Use ToolAll Articles
Browse all 8 guides covering 3-phase topics:
3 Phase Power Explained: Wye vs Delta, 120° & Uses
What is 3-phase power? Learn 120° phases, line vs phase voltage, wye/delta & why factories use it—not a calculator; links to formula guide.
Read Full Article3 Phase Power & Current Formula (√3·V·I·PF) + Examples
3-phase power & current: kW=√3·V·I·PF, motor FLA from HP, 208–480 V current presets. Free examples—verify with the calculator.
Read Full Article3-Phase PF: Clamp Meter Measurement Steps (True vs Displacement)
How to measure 3-phase power factor with a clamp meter or analyzer—true vs displacement PF, field steps & examples. Free guide; verify with kW→kVA tool.
Read Full Article3-Phase Unbalanced Load Formula (% + Causes & Fixes)
Unbalanced load in 3-phase systems: % formula, causes, and correction steps. Free worked example—verify currents with the 3-phase power calculator.
Read Full ArticleOLTC vs OCTC: Difference & 13.8 kV Cost
OLTC vs OCTC difference: outage rules and 13.8 kV cost example. Free decision table—when on-load tap changers pay off; full forms link to the tap changer guide.
Read Full ArticleVoltage Regulation Formula (%VR = (Vnl−Vfl)/Vfl×100)
Voltage regulation formula: %VR = (Vnl − Vfl) ÷ Vfl × 100%. Free 480 V transformer example—then size kVA or check taps.
Read Full ArticlekVA Formula 3-Phase (√3 × V × I) + Examples
kVA formula 3-phase: kVA = √3×V×I÷1000 with 400/480 V examples. Free—then verify with the transformer size calculator.
Read Full ArticleTransformer Tap Changer Faults (OLTC & OCTC)
Identify and prevent common transformer tap changer faults. Free OLTC/OCTC symptoms, causes, and maintenance checklist for 3-phase units.
Read Full Article