Voltage Regulation — Transformer Glossary

The percentage change in secondary voltage from no-load to full-load, expressed as a percentage of the rated secondary voltage.

Backelectrical

Voltage Regulation

The percentage change in secondary voltage from no-load to full-load, expressed as a percentage of the rated secondary voltage.

Good voltage regulation means the output voltage stays close to rated value under varying load. Typical regulation for distribution transformers is 3–5%. Lower impedance improves regulation but increases fault current levels. OLTC tap changers provide dynamic voltage regulation under varying load and supply conditions.

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Where this term matters in the ETS portfolio.

transformersSolar PV Application TransformersSpecialised transformers for photovoltaic power plants and inverter stations.

transformersBESS TransformersBattery Energy Storage System transformers optimised for cyclic loading, harmonic-rich environments, and bidirectional power flow.

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Taps (Voltage Taps)Connection points on the transformer winding that allow the turns ratio to be adjusted, changing the output voltage.

OLTC (On-Load Tap Changer)Mechanical device that adjusts the transformer's turns ratio while energised and under load, allowing voltage regulation without interrupting supply.