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Based on a new mathematical model for electromagnetic fields calculation, a numerical calculation method in design of power substation grounding system is presented. The method is applicable in many cases regardless of frequency. And the method has been proved to be available by calculating cases.
A high-power, mid-high frequency transformer using silicon steel core is designed for a 30kW, 3 kHz switch-mode power supply (SMPS). Based on the area product method (AP method), the material and type of magnetic core are selected. The winding turns and transformer loss are calculated. The wire specifications are decided. The temperature field and electric… (More)
Characterization of two CYP77 gene family members related to development of ornamental organs in petunia.