Harmonic THD workflow
How to prepare fundamental and harmonic RMS measurement records before using the Australian harmonic THD calculator.
THD record purpose
Harmonic THD calculation starts with one measurement record: a fundamental RMS magnitude and harmonic RMS magnitudes from the same voltage or current record.
The calculator shows distortion magnitude. It does not identify the source of distortion.
Workflow
- Confirm whether the record is voltage harmonics or current harmonics.
- Record the fundamental RMS magnitude from the analyser or report.
- Enter harmonic RMS magnitudes from the same record.
- Record threshold source and measurement location.
- Carry the result into equipment, DNSP or project review only with the measurement context attached.
Record table
| Field | Record | Review concern |
|---|---|---|
| Record type | Voltage or current harmonics | Do not mix record types |
| Fundamental RMS | H1 value from same record | Drives THD percentage |
| Harmonic rows | RMS magnitudes from analyser | Must share the same measurement set |
| Threshold basis | Project or equipment source | Not supplied by the page |
| Dominant harmonic | Largest entered harmonic row | Helps route follow-up review |
Boundaries
- Do not use THD alone to identify the source.
- Do not mix voltage and current values.
- Do not combine readings from different times.
- Do not hide analyser setup or threshold source.
Harmonic THD workflow in Australian work
Prepare harmonic THD inputs while keeping voltage and current records, analyser context and threshold basis separate. The useful record is not just the final number or definition; it is the combination of the entered value, the supply arrangement, the equipment or circuit reference and the decision that still needs project review.
harmonic THD workflow for Australian power-quality measurement records Keep the wording in Australian English, use metric units, and treat 230/400 V a.c. at 50 Hz as the ordinary low-voltage context unless the project information states a different value.
Checks that belong beside this page
- Regional scopeAustralia; Australian English; DNSP, analyser setup, equipment data, local authority and current standards source documents can override worksheet assumptions.
- Standards contextAS/NZS 61000 source category and Australian power-quality context noted for project review; current standards, instrument data, DNSP requirements and equipment data remain controlling inputs.
- Review timingReview cadence: Annual or when harmonic calculator fields, measurement-record fields, formula chart wording or Australian power-quality context changes.. Update trigger: Calculator formula change, measurement-record table change, DNSP context change, standards context update or project feedback.
Practical use sequence
For Harmonic THD workflow, begin with the circuit, board, load, cable route, equipment item or measurement record named by this topic. Record the value basis, such as current, voltage, kW, kVA, route length, test value, product rating, tariff value or worksheet field, then note the review boundary so another person can see what this page explained and what still needs a project decision.
The strongest Harmonic THD workflow record is specific enough to be reviewed later. It names the Australian context, keeps the entered assumptions visible, separates calculation support from compliance decisions and shows where a calculator, table, chart or term definition should be opened next.
Record detail to capture
Keep the Harmonic THD workflow note attached to Australia; Australian English; DNSP, analyser setup, equipment data, local authority and current standards source documents can override worksheet assumptions.. When the page is used during design, estimating, testing, review or study work, write the entered assumption, the source that supplied it, the circuit or equipment label and the person or role that must review the following action.
For Harmonic THD workflow, the review cadence is Annual or when harmonic calculator fields, measurement-record fields, formula chart wording or Australian power-quality context changes. and the update trigger is Calculator formula change, measurement-record table change, DNSP context change, standards context update or project feedback.. If the topic connects to Harmonic THD, open that page after the current definition, input basis or boundary has been recorded, so the next calculation inherits the right Australian context.
A complete Harmonic THD workflow record leaves four facts visible: why the page was opened, which Australian supply or equipment context applies, which value remains user-entered and what later change would alter the result. That makes the page useful as a working note instead of a loose reference copied away from the project evidence.
- InputsWrite down the entered values and their units before comparing results across calculators or reference pages.
- LocationKeep the value tied to the board, circuit, cable run, equipment terminal, supply point or worksheet row it describes.
- Authority checkCompare the record with current Australian requirements, DNSP or local authority conditions and product information.
- Review trailRetain the date, edition context and reason for the calculation so later changes can be traced.
Connected AUWiring pages
Use the related pages for Harmonic THD workflow when the topic needs a calculator input, lookup table, formula chart or supporting term before the project record is complete. Open Harmonic THD first when that page owns the next value or definition.
- Harmonic THDCalculate THD from entered fundamental and harmonic RMS magnitudes.
- Voltage unbalanceKeep voltage-unbalance records separate.
- Phase balancingReview load-current allocation where needed.
- Power-quality measurement recordKeep analyser and operating context visible.