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:
Three-Phase Power: What It Is & Benefits
What is three-phase power? Three AC waveforms 120° apart—benefits vs single-phase, wye/delta, and industrial uses. Free examples with links to the 3-phase calculator.
Read Full Article3 Phase Power & Current Formula (√3·V·I·PF) + Examples
3 phase power & current formulas: P=√3·V·I·PF and I=kVA·1000/(√3·V). Free 480V examples—verify with the 3-phase calculator.
Read Full ArticleMeasure 3-Phase PF with Clamp Meter (True vs Displacement)
Measure 3-phase PF with clamp meter or analyzer: true vs displacement PF, field steps, examples. Free guide—verify with kW to kVA.
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 Tap Changer (13.8 kV Cost Example)
OLTC vs OCTC: outage rules and cost at 13.8 kV. Free decision table—when on-load tap changers pay off for 3-phase plants.
Read Full ArticleTransformer Voltage Regulation Formula (%Z & Secondary VD)
Calculate transformer voltage regulation with %Z and load PF—480 V worked example. Distinguish regulation from conductor voltage drop.
Read Full Article3-Phase Transformer kVA Formula (√3·V·I + Examples)
3-phase transformer kVA: √3×V×I formula with 400/480 V examples. Free guide—verify instantly 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.
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