Patent ID: 7990242

Claim:
A transient voltage quashing (TQ) three-phase transformer comprising: a magnetic core having three limbs; three levels of windings placed around the three limbs, and including: a primary winding placed around each limb of the magnetic core and having terminals at which a three phase power supply may be connected; secondary windings placed around the limbs of the magnetic core and radially spaced from said primary winding, and which provide one or more three-phase output winding groups; tertiary windings placed radially in between said primary windings and said secondary windings; a plurality of surge suppressors coupled to the tertiary windings and which suppress transient voltages in (a) the tertiary windings, and (b) external circuits/devices connected to the tertiary windings; and wherein the surge suppressors further suppress transient voltages in (c) the secondary windings and (d) external circuits/devices connected to the output winding groups of the secondary windings.