Wind energy plant with short circuit current improved plant transformer

摘要

Wind energy plant for generating electrical power with a connected via a connecting line (4) plant transformer (6) with at least one phase strand for delivering the power in a network (9). The plant transformer (6) has a first and a second winding pair for each phase strand, the second winding pair (65) being spaced from the first winding pair (61), and each of the winding pairs (61, 65) being in the stray field of the other Winding pair (65, 61) is arranged. The result is a magnetic cross coupling between the pairs of windings. Thus, two systems for the power flow are formed. In the case of a short circuit in one of the two parallel systems, the effect is that the power flow through the crosswise coupling also takes place via the other parallel system. Because of the high impedance due to coupling via the stray field, however, only a relatively small increase in the short-circuit current takes place in the desired manner, so that overloading of the components is prevented.