Abstract: In order to study the distribution of magnetic field and temperature field of dry-type transformer

iron core more accurately，analyze the influence of different excitation on the magnetic field loss and hot spot

temperature rise of dry-type transformer core，firstly，Maxwell was used to calculate the transient magnetic field

distribution of dry-type transformer，and the loss of the iron core under no-load condition was obtained. On this

basis，a three-dimensional dry-type transformer magnetic field-temperature field coupling calculation method was

proposed. The magnetic field loss was coupled to Fluent as the heat source of temperature field calculation，and the

fluid structure coupling method was used to calculate the temperature field distribution of dry-type transformer.

Finally，based on the above method，the magnetic field and temperature field of transformer core under harmonic

action were calculated，and the influence of harmonic on core loss and temperature rise of dry-type transformer was analyzed，which provides a reference for the monitoring of the temperature rise about the transformer core under harmonics.

      Key words: dry-type transformer；magnetic field-temperature field coupling；load loss；core temperature rise；harmonic