Behaviors of magnetic cores have a great influence on the output characteristics of linear transformer driver (LTD) in abnormal conditions. In order to predict the residual magnetization of the cores and guide the commissioning and operation of LTD modules, a precise numerical model for circuit simulation of LTD was constructed by utilizing the test results of magnetic cores. The magnetic field intensity and magnetic induction intensity of magnetic cores at all stages were studied under normal discharge, abnormal prefire, and demagnetization through the numerical simulation of the four-stage shared cavity LTD module. With an ideal ±70 kV charging voltage discharge sequence, each level of a magnet-ic core experiences a maximum remanence variation of 1.27 T with a steady remanence of approximately -0.38 T. The maximum remanence variation of the magnetic core due to single-branch self-discharge is 1.88 T under ±70 kV charging voltage, with a steady-state remanence of about 0.39 T. The magnetic core becomes saturated immediately after mul-ti-branch switches prefire. During the demagnetization process, the magnetic core closer to the load demagnetizes earlier, and the magnetic field intensity steps up with the demagnetization of all stages of magnetic core. Results in this paper can effectively simulate the magnetization process and remanent status of the LTD magnetic core in various conditions, and judge the influence of the current remanent magnetic core on the next discharge.
关键词
直线变压器驱动源/数值模拟/逆Preisach模型/磁化过程/剩磁/磁饱和
Key words
linear transformer driver/numerical simulation/inverse Preisach model/magnetization process/residual magnetization/saturation magnetization
维普
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