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  Medium-frequency electric furnace and Series Resonant Electric Furnace If its capacitance is appropriately deducted, it will keep burning forever. What’s the reason for this?

1. The primary reason is that, during prolonged use, overheating of the capacitance caused by water, electric furnaces, or electrical components entering the condenser’s water system can lead to scale buildup and damage. Therefore, during operation, it’s important to monitor the capacitance of the cooling water flow. If the flow rate becomes abnormal, appropriate measures should be taken immediately.

   
   

2. The required intermediate-frequency signal voltage is too high. During the long-term operation and management of an intermediate-frequency induction furnace, if the furnace is adjusted to a voltage level that exceeds the rated operating voltage of the heating capacitor—commonly available technical specifications for the heating capacitor’s rated output voltage include 750V and 1200V—this can lead to overvoltage breakdown of the heating capacitor. If such a situation has not yet occurred, it is necessary to either reduce the intermediate-frequency voltage control or replace the heating capacitor with a model that has a higher voltage-withstanding rating.

3. The capacitance’s positive electrode is grounded. If, in the case of a furnace, the capacitance’s insulation deteriorates, it will lead to a ground-fault condition involving the cathode shell capacitance. Should this occur, you’ll need to rework the capacitance using an insulation cabinet.

2. Why does the same set of thyristors in the medium-frequency induction furnace keep failing?

1. During prolonged use, electric furnaces may experience overheating and failure of the electric heating capacitors due to scale buildup in the capacitor cooling pipes or blockage caused by foreign objects entering the water supply system.

2. If the intermediate-frequency voltage is too high, and during prolonged use the intermediate-frequency furnace is adjusted to a level exceeding the rated voltage of the capacitors, it can lead to overvoltage breakdown of the capacitors.