Voltage unbalance
Voltage unbalance meaning in Australian three-phase power-quality records.
Meaning in three-phase voltage records
Voltage unbalance describes how far measured three-phase voltages differ from their average or expected relationship. In Australian 230/400 V a.c., 50 Hz records it is usually a power-quality measurement value, not a diagnosis by itself.
The term should stay attached to the measurement point, voltage set, operating condition and threshold source. Mixing line-to-line and phase-to-neutral values without a clear basis can make the record hard to interpret.
Measurement set and threshold basis
Voltage-unbalance records need a consistent measurement set and a stated comparison basis. The calculator can process entered values, but the project still needs to say what threshold or source is being used.
| Record context | Keep visible | Why it matters |
|---|---|---|
| Measurement point | board, equipment or supply location | Shows where the voltage set was taken |
| Voltage set | phase-to-phase or phase-to-neutral values | Prevents mixed measurements from being compared |
| Review basis | entered threshold, equipment note or DNSP context | Separates the result from a universal limit |
What unbalance does not diagnose
Voltage unbalance does not identify the cause on its own. Load distribution, supply conditions, equipment behaviour, measurement timing and instrument setup may all matter.
This glossary page does not set universal limits or diagnose faults. It defines the term so the calculator, chart and measurement table can be read consistently.
Using unbalance results
Use the voltage unbalance calculator for entered voltage measurements. Use the measurement table to record the point, operating condition and threshold basis before the result is used in a power-quality review.
Source and review
Check the terminology source, review timing and Australian application before carrying this term into a project record.
| Item | Value |
|---|---|
| Source | AUWiring voltage unbalance calculator wording, formula chart and power-quality measurement record table. |
| Source type | Australian terminology |
| Derivation basis | AUWiring Australian glossary term; no utility limits are reproduced as universal pass criteria. |
| Last checked | 2026-07-13 |
| Review interval | Annual terminology review or sooner if voltage-unbalance calculator wording changes. |
| Review trigger | Update when voltage-unbalance calculator, chart or measurement table changes. |
| Version used | T41-2026-07-13 |
| Australian application | Australia; Australian English power-quality terminology. |