Long-term overload of the transformer will not only affect its service life, but also cause great safety hazards, which is extremely undesirable.
Long-term overload of dry-type transformers is not acceptable. Because dry-type transformer is an important power equipment and electrical appliances. Overload means that its work is relatively large, which exceeds its own operating capacity. This kind of damage to dry-type transformer overload is relatively great.
Dry transformers rely on air convection for natural cooling, or increase fan cooling, and are mostly used for small-capacity dry transformers such as high-rise buildings, high-speed toll stations, local lighting, and electronic circuits.
Long-term overload operation of the dry transformer will cause the coil to heat up and gradually deteriorate the insulation. This will cause a short circuit between boxes, a short circuit between phases or a short circuit to the ground and the decomposition of the oil. The aging of the iron core insulation or the damage of the clamping bolt sleeve will cause the iron core to generate a large eddy current, causing the iron core to heat up for a long time and cause the insulation to age.
When repairing the hanging core of a dry transformer, care should be taken to protect the coil or insulating sleeve. If scratch damage is found, it should be dealt with in time.
It can be seen from the above that the influence of the overload of the dry-type transformer is great. Therefore, it is necessary to continuously improve the operation capability of dry-type transformers to make dry-type transformers operate more safely.