what causes power transformers to blow?
The main reasons for power transformer explosion are as follows:
1. Insulation damage: Power transformers require a large amount of insulating materials, which may age, deteriorate, or enter water during prolonged use, leading to a reduction in insulation strength. If the winding insulation is damaged, a short circuit may be triggered, which may generate high temperature and cause fire.
2. Main insulation breakdown: If the transformer bushings are poorly sealed, this may lead to insulation damage or insufficient insulation distance. Under the action of overvoltage, insulation breakdown may occur, which may lead to fire.
3. Poor contact: If there is poor contact between the on-load tap-changer and the winding connections, high temperatures may occur and even cause a fire. Causes of poor contact may include loose bolts, poor soldering or damaged on-load tap-changer contacts.
4. Load short-circuit: When a load is short-circuited, the transformer is subjected to a large short-circuit current. If the protection system fails or the setting value is over-adjusted, this may cause the transformer to burn out.
5. transformer overheating: if the transformer is overheated for a long time, it may affect its service life, and in serious cases, it may even trigger oil injection combustion or explosion.
6. lightning strikes: the overvoltage generated by lightning may break through the insulation of the transformer, leading to transformer burnout and cause fire.
In order to prevent the explosion of power transformers, you need to regularly check and maintain the transformer, timely detection and treatment of insulation aging, poor contact and other issues. At the same time, it is also necessary to ensure that the load of the transformer is within the permissible range to avoid short circuits. In areas where lightning is frequent, it is also necessary to take lightning protection measures, such as the installation of lightning arrester, in order to protect the safety of the transformer.
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