intermediate frequency electric furnace power supply
The intermediate frequency electric furnace power supply is a thyristor variable frequency power supply, which is matched with the induction coil and belongs to the exclusive power supply of the intermediate frequency furnace. Its operating frequency range is 100-8000Hz. In the circuit function of the intermediate frequency power supply, it can be divided into four parts: rectification trigger circuit, inverter circuit, regulator circuit, and operation protection circuit. Operation protection circuit part of intermediate frequency electric furnace power supply:
There are various operations and protection circuits in the control circuit of intermediate frequency electric furnace power supply. have any effect on the system. The specific protection functions are:
1. Phase loss protection of the intermediate frequency electric furnace power supply – </span> of the intermediate frequency electric furnace power supply detects whether the three-phase AC input has a phase loss, which can save the detection circuit of the fast fuse fault indicator.
2. Overcurrent protection of intermediate frequency electric furnace power supply – the system overcurrent cut-off protection of intermediate frequency electric furnace power supply, the overcurrent level does not need to be set separately, and the control circuit is automatically set at 1.5 times the rated output.
3. Overvoltage of intermediate frequency electric furnace power supply – intermediate frequency output overvoltage protection, overvoltage level does not need to be set separately, and the control circuit is automatically set at 1.5 times the rated output intermediate frequency voltage. The overvoltage protection action cuts off the rectifier bridge on the one hand, and directly connects the inverter bridge on the other hand, which can effectively prevent the damage of the inverter thyristor caused by the open circuit of the output cable.
4. Low water pressure of the intermediate frequency electric furnace power supply – The cooling water pressure protection of the intermediate frequency electric furnace power supply has a delay action of 5-8 seconds, which can prevent the system from tripping due to the instantaneous fluctuation of water pressure.
5. The control power supply of the intermediate frequency electric furnace power supply is under-voltage – the protection of the low power supply voltage of the control circuit can prevent the random triggering of the main circuit when the control circuit is powered off.
