Calculation Of Electromagnetic Parameters And Analysis Of Harmonic Magnetomotive Force Of Stator Wingding Of Powerformer

Powerformer is a new high voltage generator,which use XLPE cable as stator winding instead of rectangular conductor bars,thereby it overcome the shortcomings which the shape of these conductors results in an uneven electric field distribution with high electric field strenghs at the corners especially and prevents the output voltage of the conventional generator from exceeding about 36kV． Powerformer offers a direct connection to the network without the need for a step-up transformer．As a consequence, there are some merits in the total plant equipped with Powerformer,such as high effiency, high availability,low maintaining cost and giving less environmental impact. Powerformer have some changes in constract with the conventional generator,subsequently it also have some new problems．In order to have an economical,efficient,credible development and application．The structure and the philosophy of electromagnetism of Powerformer will be on speaking terms changes．Electrical design,magnetism design,thermal design and structural design are have some new changes． Above all,the electromagnetism parameter and the harmonic magnetomotive force of Powerformer are studied in this paper．First,it mainly utilizes analytics to deduce formula of slot leakage reactance．It considers three instances,including monolayer-slot,multilayer isometric-slot and multilayer anisometric-slot．Then,the analytics and the FEM are utilized to calculate slot leakage reactance of stator winding of prototype of Powerformer and compare their results．Second,the theory of utilitzing FEM to calculate the reactance of Powerformer is simply introduced,including stable reactance,transient and subtransient reactance．Specially,the saturated influence of the stable reactance is considered．Then, the results are analysed．Final,it mainly introduces the influence of harmonic magnetomotive force of stator winding and analyses the harmonic magnetomotive force of stator winding．Then,it mainly analyse harmonic magneto-motive force of stator winding through arranging various arrays of stator winding and observe their influence．...