Power take-off from transformer tap changer winding

Details Power take-off from transformer tap changer winding Power take-off from transformer tap changer winding

H - Electricity

02

M

323/31, 336/43

H02M 5/10 (2006.01)

Patent

CA 1246671

POWER TAKE-OFF FROM TRANSFORMER TAP CHANGER WINDING ABSTRACT OF THE DISCLOSURE A power system may have one or more stations which have a need for electrical power to service the station. Such a power station has at least one large power transformer with a tap changer winding to accommodate changes in demand for power. In the past a separate service winding was added to the power transformer to provide the take-off power for the station. The service winding had a low impedance and under fault conditions tended to carry high current. This required a mechanically stronger core and windings, and a heavier connection with the service winding. In the invention, instead of a separate service winding, an auxiliary transformer having two windings is provided. One winding is connected in parallel with the tap changer winding. The other winding provides take-off power for the station. Because the tap changer winding has a higher impedance than a service winding, it tends to carry a smaller current under fault conditions making it possible to use a smaller core and smaller connections for the power take-off.

461627

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