When the thyristor damage need to check the analysis of the reasons, the core can be removed from the cooling jacket, open the core box and then remove the chip, observe the signs of damage to determine what is the reason. The following are some common causes of thyristor damage to determine the method:

Voltage breakdown

Thyristor can not withstand the damage due to voltage, the chip has a smooth hole, and sometimes need to use magnifying glass to see. The reason may be due to the tube itself pressure drop or circuit breakdown caused by high voltage breakdown.

2. The current is damaged

The sign of current damage is that the chip is burned into a pit, rough, and located away from the control pole.

3. The current rate of increase is damaged

The mark is the same as the current damage, and its position is near the control pole or just above the control pole.

4. The edge is damaged

If occurred in the chip round chamfer, there are small smooth holes. With a magnifying glass can be seen on the chamfer surface with thin metal scratches. This is caused by the manufacturer's installation inadvertently. It causes voltage breakdown.

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