公开(公告)号：US12080461B2

公开(公告)日：2024-09-03

申请号：US17844294

申请日：2022-06-20

申请人： Hitachi Energy Ltd

发明人： Stephane Isler ,  Valter Porcellato

IPC分类号： H01F27/10 ,  G01K7/42 ,  G01R31/62 ,  H01F27/40

CPC分类号： H01F27/10 ,  G01K7/427 ,  G01R31/62 ,  H01F27/402 ,  H01F2027/406

摘要： A transformer assembly includes an electric transformer, a temperature sensor system, and a computation unit for determining a thermal state of the electric transformer. The electric transformer includes a cooling device having at least one liquid coolant channel to absorb exhaust heat from the electric transformer, a heat spreader for transferring heat from the liquid coolant to a heat dissipation surface of the heat spreader, and an air blower configured to effect an airstream along the heat dissipation surface. The temperature sensor system includes an entering coolant sensor for providing an entering coolant temperature signal, a leaving coolant sensor for providing a leaving coolant temperature signal, an entering airstream sensor providing an entering airstream temperature signal, and a leaving airstream sensor providing a leaving airstream temperature signal. The computation unit is configured to determine a thermal state of the transformer.