An energy saving transformer is essentially a tapped transformer, usually auto-wound, providing a voltage reduction.  Many types of electrical equipment can operate perfectly well on a lower voltage with a consequent reduction in power consumption and in some cases an increase in operating life.  This is especially so with equipment designed to operate on 230V or 220V supply and where the supply voltage has remained at 240V, and similarly for three-phase equipment designed for 400V or 380V on 415V supply.

TEC manufactures single and three-phase Energy Saving Transformers in power ratings to approx 1 MVA depending on the voltage reduction required – typically from 2½% to 8% according to customer requirements.

They can be supplied for a fixed voltage ratio or with tappings for preset, manually selected or contactor/remote selection of the voltage reduction.  A sizing calculator for auto-transformers is available here and details of TEC single and three-phase power transformers here.

Harmonic Reduction

Where harmonics and high neutral currents are present three-phase energy saving transformers can be supplied with the winding arrangements of our HRT series Harmonic Reduction Transformers to enable the advantages of both reduced harmonics and power consumption to be provided in a single equipment.

For an introduction to power quality and harmonic considerations, click here

and for details of Harmonic Reduction Transformers, click here.

IMPORTANT NOTE:

Fixed ratio Energy Saving Transformers are only appropriate when the mains supply is known to be reasonably stable or the reduction ratio is relatively small.  A large reduction combined with possible voltage reductions by the electricity supplier (REC) can cause the supply voltage to the equipment being fed falling below its safe operating limits.  This can be completely avoided by fitting a Mains Voltage Stabiliser which continually corrects the supply voltage and can be set to provide and maintain the most economic voltage level.

For a technical note ‘Energy Saving and Equipment Life Prolongation by Voltage Reduction’ click here.

For details of Claude Lyons automatic voltage stabilisers click here.