Transformer with test circuit

A transformer, comprising:

• a primary circuit with a primary inductor,
• a first secondary circuit with a first secondary inductor that is galvanically isolated from the primary inductor and coupled to the primary inductor, and
• a second secondary circuit with a second secondary inductor that is galvanically isolated from the primary inductor and coupled to the primary inductor, wherein the second secondary inductor is implemented redundantly with respect to the first secondary inductor, such that the first secondary inductor is wound upon the second secondary inductor or the second secondary inductor is wound upon the first secondary inductor,
• wherein the first and second secondary inductors are connected to one, or each to one, DC voltage source as well as each to a test circuit with a tapping point for tapping off a test voltage.