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All Updated Guides

UPS Battery Maintenance Schedule & Replacement Checklist

Build a practical UPS battery maintenance schedule: inspect, trend, decide whether to replace, and verify runtime after a battery change.

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Transformer Derating Formula (kVA ÷ k_site — 127 kVA Example)

Transformer derating formula: minimum nameplate kVA = required kVA ÷ verified site factor. Includes a conditional 127 kVA example and OEM limits.

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Solar Transformer Capacity Check (750 kVA Example)

Check solar transformer capacity: max(PV, load, reverse)×margin with harmonics—750 kVA example. Free guide + sizing calculator.

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Transformer Sizing for Harmonic Loads (K-Factor and Non-Linear Loads)

Transformer sizing for harmonic loads for electrical engineers and designers: K-factor and non-linear load sizing, THD derating, and VFD/UPS examples.

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Transformer 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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kVA Formula 3-Phase (√3 × V × I) + Examples

kVA formula 3-phase: kVA = √3 × V × I ÷ 1000 with worked 400 V and 480 V examples. Free calculator—then verify the kVA with the transformer sizing calculator.

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Voltage 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.

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OLTC 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.

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Transformer Loss & Efficiency Formula (η)

Free transformer loss formulas: core vs copper loss, efficiency η = Pout/(Pout+losses). Worked 98.7% example—then size kVA in the transformer sizing calculator.

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3-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.

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