The integrated damper winding behaves like a continuous classic damper winding during sudden short circuits in large, saturated hydro generators

The integrated damper winding design, where the ends of the damper bars are brazed to copper plates, provides an indirect electrical pole-to-pole connection through the contact of the pole with the rotor rim in salient pole synchronous machines. This design is an alternative to the continuous classic design, where solid copper elements through the pole gap connect the damper bars of adjacent poles directly. The advantage of the integrated damper winding is the absence of mechanically stressed copper elements in the pole gap. A disadvantage of the integrated damper winding is that the ratio of the subtransient reactances in the quadrature and direct axes 𝑋q′′ ⁄𝑋d′′ is higher than for the continuous classic design. This conclusion is primarily based on the results of applied voltage tests at…