Plan site power with accurate factor checks. Use phase methods, harmonic inputs, and load views. See results above, then export clean project reports fast.
Use the harmonic method, direct power method, or electrical values method. The form uses three columns on large screens, two on medium screens, and one on small screens.
| Load | Phase | Voltage (V) | Current (A) | Real Power (kW) | DPF | THD (%) | True PF |
|---|---|---|---|---|---|---|---|
| Tower Crane Panel | Three | 400 | 38 | 20.00 | 0.96 | 12.00 | 0.9532 |
| Site Lighting Board | Single | 230 | 18 | 3.60 | 0.92 | 18.00 | 0.9055 |
| Concrete Mixer Feed | Three | 400 | 24 | 13.10 | 0.89 | 8.00 | 0.8872 |
| Portable Welder | Three | 400 | 30 | 16.40 | 0.94 | 22.00 | 0.9182 |
These rows illustrate how harmonic content can reduce true PF even when displacement PF remains high.
True PF = P / S
P is real power in kW. S is apparent power in kVA. This method works when measured load power and apparent demand are already known.
Distortion Factor = 1 / √(1 + THD²)
Use THD as a decimal. In this page, entered THD percent is converted to a decimal before calculation.
True PF = Displacement PF × Distortion Factor
This is useful for non-linear construction loads such as welders, drives, temporary lighting boards, and electronic equipment.
Single phase: S = V × I / 1000
Three phase: S = √3 × V × I / 1000
Use line voltage and line current.
Q = P × tan(cos⁻¹(DPF))
This gives an estimated reactive component from the displacement angle. It is helpful when comparing motor-heavy and harmonic-heavy site loads.
It shows how effectively the temporary electrical system converts supplied apparent power into useful real power after phase shift and harmonics are considered.
Displacement PF only reflects phase angle. True PF also reflects waveform distortion, so harmonic-heavy equipment can reduce the final value.
Welders, variable-speed drives, LED lighting drivers, battery chargers, and electronic power supplies can add distortion and reduce true PF.
Use single-phase for smaller boards and light tools. Use three-phase for cranes, mixers, pumps, and temporary distribution systems fed by three-phase service.
Yes. Use the direct power method with real power and apparent power, or the electrical values method when voltage, current, and real power are known.
Many teams aim for values close to 0.95 or higher, but actual targets depend on equipment mix, generator sizing, and utility or contract requirements.
Reactive power helps explain phase-angle demand and supports load reviews, generator planning, and capacitor discussions for motor-driven site equipment.
CSV exports the result table for spreadsheet review. PDF captures the displayed report and chart for project records or client documentation.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.