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Method for selecting inverter thyristor for intermediate frequency furnace
1) selected according to the operating frequency range of the intermediate frequency power supply;
The frequency is at 100HZ---500HZ with a selected turn-off time of 20μs-45μs for KK-type thyristors.
The frequency is at 500HZ--- 1000HZ with a selected turn-off time of 18μs-25μs for KK-type thyristors.
The KK-type thyristor with a frequency of 1000HZ--2500HZ with a selected turn-off time of 12μs to 18μs.
KKG-type thyristors with a frequency of 2500HZ---4000HZ with a selected turn-off time of 10μs to 14μs.
The KA-type thyristor with a frequency of 4000HZ---8000HZ with a selected off-time of 6μs - 9μs.
2) selected according to the output power of the intermediate frequency power supply;
According to the theoretical calculation of the parallel bridge inverter circuit, the current flowing through each thyristor is 0.455 times of the total current. Considering that sufficient margin is left, the thyristor of the same magnitude as the rated current is usually selected.
The power is 50KW----100KW of selected current 300A/1400V thyristor. (380V phase-in phase voltage)
The thyristor with a selected current of 500A/1400V with a power of 100KW--250KW. (380V phase-in phase voltage)
The thyristor with a power of 800 kW to 400 kW has a selected current of 800 A/1600 V. (380V phase-in phase voltage)
The thyristor with a rated current of 1500A/1600V with a power of 500KW--750KW. (380V phase-in phase voltage)
The thyristor with a selected current of 1500A/2500V with a power of 800KW-1000KW. (660V phase-in voltage)
The thyristor with a selected current of 2000A/2500V with a power of 1200KW-1600KW. (660V phase-in voltage)
The selected current of 1800KW-2500KW is 2500A/3000V thyristor. (1250V phase voltage)
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