There are Two main reasons for the need to transform from three phases to two phases.
1. To give a supply to an existing two phase system from a three phase supply.
2. To supply two phase furnace transformers from a three phase source.

TEC incorporates a special three phase core design which has two windings, the main and teaser, the centre limb is 41% larger in section and left unwound.

The three phase side is connected in a Tee formation, with the main winding wound for the full line volts and centre tapped. This winding is also interleaved so that any magnetic effect of a current entering at the centre point is cancelled out.
The teaser winding is wound for 87% of the line volts with one end connected to the centre point of the main winding.

Each secondary is a simple single phase winding with the volts and amps no different from what would be expected in an ordinary single phase transformer.

 TEC Products


CL DgreyL outline 4ptv2

The Claude Lyons Group
2 Tower House, Hoddesdon, Herts, EN11 8UR, England
Spares are obtainable from who are stockists of surplus Claude Lyons units and spares .

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Company registered in England No 222791
Registered office as above

VAT Reg No. GB 213 5042 15


UK Established Since 1918

The Claude Lyons Group was founded in the UK in 1918 and is still in private ownership. Since our early days we have been innovators in areas related to voltage and power control and more recently in energy saving and harmonic mitigation. Operating as a global exporter with many years experience we can justifiably call ourselves a world leader in the field of voltage stabilisers, power conditioning and uninterruptible power supplies (UPS)