Abstract:The quality of equipment is the material basis for the security and stability of power grid. Improving the level of power grid equipment, promoting the power grid equipment to move towards the middle and high-end, and constantly improving the intrinsic safety level of power grid are the most important tasks at present and in the future. Only by controlling the quality of grid equipment entering the network, that is, starting from the procurement quality, can the equipment quality be improved in essence. In recent years, State Grid Corporation of China has carried out supplier qualification and capability verification before bidding. Through verification and confirmation of supplier"s qualification, performance and other information and on-site actual production situation, it has preliminarily grasped whether potential suppliers have the qualification and ability to produce qualified products. However, there are still major failures during the operation of the equipment. Therefore, in order to effectively prevent and eliminate product technology risks, promote the transformation of existing power enterprises from scale expansion type to quality benefit type, strengthen the whole process quality control of power grid, improve equipment quality from the source, establish a supplier selection mechanism based on pso-elm, promote power grid equipment to move towards the middle and high-end, and improve the intrinsic safety and reliability level of power grid.