特高压换流变压器绕组动稳定能力分析

When a short circuit occurs, the winding of UHV converter transformer is subjected to a large electromagnetic force, which may lead to deformation and damage of the winding, and even explosion. Therefore, it is necessary to study the characteristics of the winding when it is subjected to short-circuit force, which provides a basis for the analysis of the stress stability of the winding and further judgement for whether the winding design meets the requirements. According to the characteristics of winding structure, the valve winding, the grid winding and the voltage regulating winding are equivalent to spring systems with different elastic coefficients, and an analysis model of the dynamic stability characteristics of the winding under force is established. Combined with the actual coil pressure experiment, the characteristics of the winding under impact force and static pressure are analyzed. The results show that, when the winding is subjected to dynamic impact force, the compression amount of the upper cushion block is the largest, and it bounces upward after reaching the compression limit in a very short time. After several fluctuations, the coil can recover its original size. When the winding is subjected to static pressure, the force distribution of the coil is uniform, and the compression is linearly related to the static pressure. Within this structure design, the dynamic stability of UHV converter transformer windings can meet the requirements.