Abstract:In order to accurately analyze the magnetic characteristics and loss characteristics of offshore wind power transformer at different temperatures under low frequency operation，this paper first deduces the influence of magnetic characteristics of transformer core silicon steel sheet under the influence of different temperature and frequency. The magnetization curves and loss curves of a low frequency offshore transformer core silicon steel sheet at different temperatures and different frequencies are measured by experiments. The influence of low frequency and low temperature operation on transformer operation is analyzed. The finite element software is used to establish a three-dimensional model for simulation verification. Then，the variation law of loss curve of silicon steel sheet when the transformer works under the condition of power frequency 50 Hz and low frequency 20 Hz respectively at 80 ℃ is analyzed. Finally，based on the experimental analysis and simulation verification，the general variation law of the working loss of offshore wind power transformer under low frequency and low temperature environment is obtained，which provides the basis for reducing the transformer loss and design.