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Electric heating Electric furnace If burnout occurs, the main causes are as follows:
1. Water shortage: During prolonged use, medium-frequency induction furnaces may develop scale buildup in the cooling tubes of capacitors or experience blockages caused by foreign objects entering the water supply system, leading to overheating and eventual failure of the heating capacitors. Therefore, during operation, it is important to closely monitor the flow rate of the cooling water for the heating capacitors. If any abnormality in the flow rate is detected, appropriate measures should be taken immediately.
2. If the intermediate-frequency voltage is too high, and the intermediate-frequency furnace is operated at an excessively high setting for a prolonged period—exceeding the rated voltage of the heating capacitor (common rated voltages for heating capacitors include 750V and 1200V)—this can lead to overvoltage breakdown of the heating capacitor. In such a case, you’ll need to either reduce the intermediate-frequency voltage or replace the heating capacitor with a model that has a higher voltage rating.
3. The cathode of the heating capacitor is grounded. If, during the operation of the electric furnace, the heating capacitor develops poor insulation, the capacitor’s cathode may become grounded, leading to breakdown of the capacitor’s casing. Should this occur, the insulation of the capacitor cabinet will need to be reconditioned.