### How to choose inverter thyristor for induction melting furnace?

How to choose inverter thyristor for induction melting furnace?

1) Select according to the operating frequency range of the induction melting furnace;

The selected turn-off time of frequency is 100HZ—500HZ is 20µs-45µs KK type thyristor.

The frequency is 500HZ—1000HZ, the selected turn-off time is 18μs-25μs KK type thyristor.

KK-type thyristor whose frequency is 1000HZ—2500HZ and the selected turn-off time is 12μs-18μs.

KKG type SCR with a frequency between 2500HZ—4000HZ and the selected turn-off time is 10µs-14µs.

KA-type thyristor whose frequency is between 4000HZ—8000HZ and the selected turn-off time is between 6μs and 9μs.

2) Select according to the output power of the induction melting furnace;

According to the theoretical calculation of the parallel bridge inverter circuit, the current flowing through each thyristor is times the total current. Considering that there is enough margin, the thyristor with the same size as the rated current is usually selected.

The selected current 300A/1400V thyristor with a power of 50KW—-100KW. (380V phase-in voltage)

The selected current 500A/1400V thyristor with power from 100KW to 250KW. (380V phase-in voltage)

The selected current 800A/1600V thyristor with a power ranging from 350KW to 400KW. (380V phase-in voltage)

The selected current 1500A/1600V thyristor with power between 500KW and 750KW. (380V phase-in voltage)

The selected current 1500A/2500V thyristor with a power of 800KW-1000KW. (660V phase-in voltage)

The selected current 2000A/2500V thyristor with a power of 1200KW-1600KW. (660V phase-in voltage)

The selected current 2500A/3000V thyristor with power between 1800KW and 2500KW. (1250V phase-in voltage)