2results about How to "Simple on-site operation" patented technology

This invention relates to the field of scour detection simulation of offshore wind turbine monopile foundations, specifically to a method for detecting the scour depth of offshore wind turbine monopile foundations based on a semi-analytical model. The method includes: establishing a pile-water-soil interaction model to obtain the dynamic control equations of the pile, water, and soil; analyzing the model boundary conditions; using Laplace transform to solve the control equations in the frequency domain to obtain solutions for pile displacement, seawater, and seabed potential functions containing unknowns; solving for the unknowns using the boundary conditions; obtaining the natural frequencies and mode shapes of the pile foundation at different scour depths; applying external excitation at the pile top in the field, then measuring the acceleration time history curves at different scour depths using pile acceleration sensors and vibration signal acquisition instruments, and then obtaining the natural frequencies of the pile-water-soil system through FFT transformation, which are then compared with the natural frequencies of the detection model to obtain the scour depth in the field.

The utility model relates to a connection change device for transformer. A connection change device for transformer comprises: a plurality of connection points, each connection point is connected with different coil tap in a plurality of coil taps of the high voltage side winding of transformer;A plurality of voltage equalizing balls, each voltage equalizing ball is configured to accommodate one of a plurality of connection nodes and is electrically connected with the corresponding connection point, so that the electric field around the corresponding connection point is homogenized;One or more connecting lines, each connecting line is configured to connect two connection points in a plurality of connection points via a corresponding voltage equalizing ball in a plurality of voltage equalizing balls, wherein the voltage that can be borne on the high voltage side winding of transformer is changed by changing the connection mode of one or more connecting lines and a plurality of connection points;And insulating oil is configured to immerse each connecting line and a plurality of voltage equalizing balls to insulate each connecting line and a plurality of voltage equalizing balls. Thus, the cost of connection change of transformer is significantly reduced.