Why does the induction heating furnace burn the thyristor?

The induction heating furnace is an electromagnetic induction heating equipment. The frequency of the induction heating furnace is changed by the frequency of the induction coil to generate a magnetic field to generate a magnetic field to deheat the metal. Small size, strong function, relatively simple structure, etc., are very commonly used semiconductor devices. If the induction heating furnace is always burning out the thyristor under normal use, we must be vigilant, analyze the cause, and solve the problem. Let’s talk about the reason why the induction heating furnace burns the thyristor.

A. First, check the induction heating furnace comprehensively

1. Focus on checking whether the insulation layer of the induction coil of the induction heating furnace is damaged, and whether the insulation between the induction coil and the yoke is intact

2. Whether the water-cooled cable of the induction heating furnace is bulged, and whether the connector is loose

3. Whether the cooling water pipe of the induction heating furnace body is leaking or blocked

4. Is the grounding protection of the induction heating furnace intact?

5. After confirming that the inspection points are in good condition, switch the induction heating furnace body and send electricity to the test furnace

B. Check whether the connecting bolts of the induction heating furnace connecting copper bars, furnace change switches, reactors, capacitors and other components are loose, whether there are other metal laps, whether there is water leakage, whether the cooling is intact, whether the reactor core is present Displacement, whether the capacitor is bulging or leaking.

C. Check whether the cooling water jacket of the thyristor of the induction heating furnace is cooled properly, whether the contact surface with the thyristor is smooth, and whether the installation meets the requirements.

D. To check the quality of the thyristor of the induction heating furnace, whether the thyristor is broken down at instant start or the thyristor is broken down when the load increases, check whether the electrical parameters of the thyristor meet the requirements.

In short, it is normal for the thyristor to be burnt in the induction heating furnace to appear once in a while, and it is not normal if it appears frequently. Through the above analysis and summary of the reasons for burning thyristors in induction heating furnaces, we must find out the reasons for burning thyristors in induction heating furnaces and solve them thoroughly.