Shipboard Power Quality, Harmonic Load & Transformer Capacity Tool
Screen whether added nonlinear shipboard loads fit the transformer without hiding harmonic current behind ordinary kVA. Simple mode combines active/reactive load, added THDi and the entered post-retrofit bus THDv. Advanced mode builds the nonlinear load package row by row, applies filter reductions, estimates RSS and arithmetic worst-case harmonic current, checks transformer derating, neutral triplen exposure, bus voltage distortion and source short-circuit strength.
Fast Transformer & Distortion Screen
Simple mode does not calculate bus THDv from THDi. Enter a measured/predicted post-retrofit THDv from the power-quality study or vendor/system-integrator analysis.
Transformer & System Basis
Nonlinear Load Register
THDi is entered per load. Filter reduction acts on THDi before aggregation. RSS aggregation is used for the primary screening result; an arithmetic-sum current is also shown as a conservative no-cancellation bound.
| Nonlinear load | Qty | Rated kW / unit | Demand % | PF | THDi % | Filter reduction % | Triplen share of harmonic current % |
|---|
Bus Voltage Harmonic Spectrum
Enter measured/predicted voltage harmonic magnitudes as % of fundamental. These are not derived from the load THDi register because accurate THDv requires network impedance by harmonic order.