Report & Project
FE-IEC312-—
Equipment Under Test (EUT)
Assessment Purpose
Field/indicative assessment: computed per Cl. 4 & 5 methodology, but formal compliance presumes the Cl. 7 reference test-supply conditions. Treat results as an engineering indication unless measured under those conditions.
A Supply System Parameters
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B Short-Circuit Ratio Rsce (Cl. 3.14, Cl. 5.2)
Rsce = Ssc / Sequ (Sequ = √3·Un·Iequ for 3-phase, Un·Iequ for single-phase/interphase) · equivalently Isc / Iequ
C Equipment Type & Table Selection — Fig. 3 Flowchart
Balanced three-phase → Table 3 (general), or Table 4 / Table 5 if conditions below are confirmed. Unbalanced three-phase / single-phase / interphase → Table 2.
Confirm any condition below to qualify for the relaxed Table 4 / Table 5 limits. Leave all unchecked to use the general Table 3 baseline.
Computed
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Sequ (kVA)
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Rsce
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Rsce floor category
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Table applied
Limits are looked up at the highest tabulated Rsce that does not exceed the computed value (the conservative floor-snap method used in the IEC normative tables, not linear interpolation) — e.g. an actual Rsce of 95 uses the Rsce=66 row.
Import Measurement Data
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Drag & drop your filled .xlsx or .csv template here, or click to browse
Columns expected: Order, Label, Description, L1 Current (A), L2 Current (A), L3 Current (A) — Iref row first
Reference Current
Iref = average r.m.s. input current per Cl. 4.1 (manufacturer may specify within ±10% of measured value). Not the fundamental I1.
Harmonic Spectrum — measured average current, per phase (Cl. 4.2.4)
Enter the average r.m.s. measured current for each harmonic order, in amperes. Triplen rows are greyed/locked for balanced three-phase equipment (cancel by definition).
Project Summary & Overall Compliance Verdict
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Rsce used
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Table applied
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THC/Iref (worst)
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PWHC/Iref (worst)
NOT YET COMPUTED
Per-Harmonic Assessment, by Phase
Verification status: Tables 2, 3, 4 & 5 limits, THC/PWHC, and the 16/h even-harmonic rule are taken directly from the validated Foretec Excel v3 workbook (IEC_LIMITS sheet). For Tables 2/3/4, harmonics H14–H40 not individually listed have no individual limit — they are covered only by the THC/Iref and PWHC/Iref aggregate checks. Table 5 lists additional explicit higher orders plus an unlisted-order floor (1%→3% of Iref, interpolated between Rsce 33 and 250).