An investigation on slot configuration in new generation of synchronous generators based on XLPE cables

Regarding the change of slot in high voltage synchronous generators, and the importance of slot leakage reactance in subtransient and transient short circuit currents and in the amount of synchronous reactance, this paper studies the effect of the changing of slot and conductor shape in high voltage synchronous on the amount of slot leakage reactance, using analytical formula and numerical analysis. Considering three different slot configurations for one sample high voltage synchronous generator, rated at 63 kV and 25 MVA, the slot leakage reactance is calculated by applying conventional formula for rectangular conductor cross-section, and using finite element method. Then, the results are compared to each other. Finally, the effect of the new slot configuration of high voltage generator on slot leakage reactance is shown. Therefore, from electromagnetic viewpoint, it has been tried to introduce a better slot configuration of high voltage synchronous generator in this paper.