Wind power wire and cable will become the focus of development

With the rapid development of wind turbines, wind turbine cables that can withstand the special requirements of wind power, such as torsion, cold, salt spray resistance, oil resistance, ultraviolet resistance, softness, and mobility, will become one of the development priorities in the coming years.

The stator of the generator adopts ultra-high voltage cable, and the round cable will replace the rectangular copper bar, and the generator can be connected to the grid without the transformer, thereby greatly reducing the cost.

According to the principle of optimized design, the stator core slot of a large-sized motor is rectangular, and the distribution of the electric field strength of the rectangular cross-section conductor is not equal for the coil or bar in the slot. The four corners of the coil are as high as 9KW/mm. The four straight sides are only 3KW/mm. This will lead to a great waste of insulating material. Cables with a circular section do not have this problem and the electric field intensity is evenly distributed. Fundamentally, the problem of concentration of field strength at the corners, uneven insulation thickness, and non-thinning cannot be eliminated.

This reform can be used to increase the electric field strength from the original 2.5 KW/mm to 15 KW/mm. This circular cable adopts industrial mass production of cross-linked polyethylene insulation, the cost is low, but the voltage can be as high as 500KW, affecting many voltage selection factors, such as the connection of the power grid, local adjustment rules, the maximum output of wind energy per unit surface, to the website. The distance, the impact on the environment and so on. The output voltage of the generator is raised to the level of a high grid, and there is no need to go through a step-up transformer and go online. The circular cables used for generators do not require metal enclosure shielding, although they all use the same materials and solid extrusion insulation technology, which is a popular standard commodity on the market.