Voltage sag and swell terms
How to record sag, swell, dip and interruption wording around Australian power-quality calculator records.
Term-record purpose
Sag, swell, dip and interruption words are easy to mix with other power-quality calculations. A voltage-unbalance value or THD value does not describe event duration by itself.
This guide keeps event language attached to the measurement record.
Workflow
- Identify whether the record is a steady measurement, start event or logged power-quality event.
- Record the term used by the analyser or report.
- Keep event duration and timestamp with the source record.
- Use voltage-unbalance or THD calculators only when their input type matches.
- Carry event records into DNSP, equipment or project review separately.
Term table
| Term | Record need | Do not confuse with |
|---|---|---|
| Sag or dip | Event magnitude and duration | Voltage unbalance percentage |
| Swell | Event over-voltage record | Nominal voltage setting |
| Interruption | Supply-loss event record | Harmonic distortion |
| Unbalance | Three comparable voltage readings | Sag duration |
| THD | Fundamental and harmonic RMS magnitudes | Voltage swell event |
Boundaries
- Do not calculate sag duration from spot voltages.
- Do not use THD as a voltage-event label.
- Do not remove analyser context from the term.
- Do not treat terminology as a network-performance decision.
Voltage sag and swell terms in Australian work
Keep sag, swell, dip and interruption language traceable without forcing those events into voltage-unbalance or THD calculators. 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.
voltage sag and swell terminology workflow for Australian power-quality 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 and current standards source documents can override worksheet assumptions.
- Standards contextAS/NZS IEC 61000.4.30 and AS/NZS 61000 source categories noted for project review; current standards, instrument data and DNSP requirements remain controlling inputs.
- Review timingReview cadence: Annual or when measurement-record fields, power-quality wording or Australian standards context changes.. Update trigger: Measurement table change, power-quality calculator boundary change, standards context update or project feedback.
Practical use sequence
For Voltage sag and swell terms, 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 Voltage sag and swell terms 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 Voltage sag and swell terms note attached to Australia; Australian English; DNSP, analyser setup, equipment data 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 Voltage sag and swell terms, the review cadence is Annual or when measurement-record fields, power-quality wording or Australian standards context changes. and the update trigger is Measurement table change, power-quality calculator boundary change, standards context update or project feedback.. If the topic connects to Voltage unbalance, 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 Voltage sag and swell terms 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 Voltage sag and swell terms when the topic needs a calculator input, lookup table, formula chart or supporting term before the project record is complete. Open Voltage unbalance first when that page owns the next value or definition.
- Voltage unbalanceUse only for comparable three-voltage measurement sets.
- Harmonic THDUse only for harmonic magnitude records.
- Motor voltage dipUse for motor-start dip estimates.
- Power-quality measurement recordRecord event time, location and instrument context.