high-voltage electrical equipment;  modeling;  Modal analysis

The calculation model of high-voltage electrical equipment is established, and the specific numerical analysis of several typical high-voltage electrical equipment is carried out by applying the subspace iterative method, and the modal differences between the mechanical calculation model of rigid node system and flexible node system are compared. The calculation results show that the calculation model of high-voltage electrical equipment is more in line with the flexible node system. That is, the rotational stiffness of the connection between the porcelain casing and between the equipment and the bracket should be included in the calculation, and the results obtained can provide a reference for the seismic design of high-voltage electrical equipment.