Inductive melting furnace inverter thyristor selection method

1) selected according to the operating frequency range of the intermediate frequency power supply of the induction melting furnace ;

Frequency 100H the Z --- 500H the Z selected turn-off time 20 is [mu] S-45 [mu] S of KK thyristor.

Frequency 500H the Z --- 1000H the Z selected turn-off time 18 is [mu] S-25 [mu] S of KK thyristor.

Frequency 1000H the Z --- 2500H the Z selected turn-off time 12 is [mu] S-18 is [mu] S of KK thyristor.

Frequency 2500H the Z --- 4000H the Z selected turn-off time in 10 [mu] S-14 [mu] S of KKG SCR type.

The KA -type thyristor with a frequency of 4000H Z ---8000H Z with a selected turn-off time of 6 μ s — -9 μ s .

2) selected according to the output power of the intermediate frequency power supply of the induction melting furnace ;

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/1400 V thyristor. (380 V phase-in voltage )

The power is 100K W - -250K W with a selected current of 500 A / 1400 V thyristor. (380 V phase-in voltage )

The power is 350K W - -400K W with a selected current of 800 A / 1600 V thyristor. (380 V phase-in voltage )

The power is 500K W - -750K W with a selected current of 1500 A / 1600 V thyristor. (380 V phase-in voltage )

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

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

Power 1800K W is -2500K W is selected current of 2500 A / 3000 V thyristor. (1250 V phase voltage )