HE Yuling, LI Yong, ZHANG Wen, et al. Impact of inter-turn short fault on winding insulation temperature rising characteristic in PMSG[J]. Electric Machines and Control, 2024, 28(4): 18-30.
DOI:
HE Yuling, LI Yong, ZHANG Wen, et al. Impact of inter-turn short fault on winding insulation temperature rising characteristic in PMSG[J]. Electric Machines and Control, 2024, 28(4): 18-30. DOI: 10.15938/j.emc.2024.04.003.
Impact of inter-turn short fault on winding insulation temperature rising characteristic in PMSG
The winding insulation temperature rising characteristic was investigated before and after interturn short circuit(ITSC)in permanent magnet synchronous generators(PMSG). Firstly,the magnetic flux density,stator current,core loss and copper loss expressions in normal and ITSC conditions were deduced. Then three dimensional finite element analysis(FEA)models were established. The varied types of loss were calculated in the electromagnetic filed and imported into the temperature field to obtain the temperature distribution of winding insulation. Finally,the experiments were taken on the LR-5 prototype PMSG to measure the winding insulation temperature. The experiment results are good accorded with the theoretical analysis and FEA results. It is shown that the winding temperature will increase signifi cantly acted by the shorted winding current under ITSC fault. The server ITSC fault degree is intensified,the higher winding insulation temperature will be. In addition,the deformation,strain and stress resulting from the uneven distribution of thermal load on the winding insulation will also intensify. The insulation at the nose end of the winding is prone to damage due to high temperatures. This can be addressed by improving the cooling and heat dissipation structure or applying a heat-resistant coating to enhance the reliability of the insulation at the nose end.
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