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Medium frequency induction furnace main circuit thyristor component selection basis
When using 6- pulse rectification or 12- pulse rectification, the current value of the thyristor is selected based on the rectified DC current, and is selected according to the following principles.
The selection of the thyristor current value of the intermediate frequency induction furnace :
A , calculate the rectified DC voltage according to the incoming line voltage
DC voltage Vd=1.35 × incoming voltage
DC voltage Vd=1.26 × incoming voltage
B , DC current
DC current I d Max= intermediate frequency power / DC voltage Vd
DC current I d Max=0.5 × medium frequency power / DC voltage Vd
c , the average current of the rectifier thyristor can be calculated as follows
Ikp max= I d Max / 2.72
d , the average current of the inverter thyristor can be calculated as follows
Ikkmax=0 . 45 × I dmax
Through the above formula, the specifications of the thyristors are selected and selected to have a safety factor greater than 2 times.
The selection of the thyristor voltage value of the intermediate frequency induction furnace :
A , the peak voltage tolerated on the rectifier thyristor Vkp=1.414 × incoming voltage Vi
B. Peak voltage tolerated on the inverter thyristor Vkk=1.414 × intermediate frequency voltage Vo
Wherein the intermediate frequency voltage Vo = 1.5 × DC voltage Vd (already calculated the Vd)
The calculated thyristor rectifier and inverter withstand peak voltages on Vkp and VKK, when selecting the thyristor, the thyristor voltage value by more than 2 times the peak voltage on the principle withstand SCR Select.
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