722 / 2022-03-31 18:25:07

Study on Valve Screwing technology for automatic Oil Extraction of Operating Transformer

direct torque control,transformer,transfomer oil,Automatic Control,oil extraction

For operating oil-immersed transformer oil extraction problem, this paper takes the most widely used oil plug type oil ex-traction valve as the research object, and conducts a study on the mechanical screwing oil extraction technology required for unmanned oil extraction. It is found that the unscrewing of the oil extraction valve is mainly divided into three stages: locking, partial preload and slackening. The mechanical characteristics of the above three stages are analyzed in the paper, and it is found that the preload force and the resistance moment are mainly functions of the angular displacement. Through the engineering empirical formula, the active torque negative feedback control system is established to obtain a more ideal angular displacement-time curve, and the control curve of active torque with time is obtained based on simula-tion. To determine the minimum unscrewing torque, this paper finds that the minimum unscrewing torque increases non-linearly with the increase of the tightening torque and gradually converges to the tightening torque through tests. Finally, the design of the wrench for opening the valve housing and the screwing end of the oil valve is proposed to realize the full automation of the oil extraction process, which provides suggestions and guidance directions for the transformer un-manned oil extraction technology.