During the storage, transportation or operation and maintenance of transformer insulation oil, if the oil quality is poor or there are too many impurities and moisture, the insulation strength will be reduced. When the insulation strength decreases to a certain value, the transformer will short-circuit and cause sparks, arcs or dangerous temperatures. Therefore, the transformer should be regularly tested for oil quality during operation, and the unqualified oil should be replaced in time.
Prevent the aging and damage of the iron core insulation of the electric furnace transformer : the aging of the iron core insulation or the damage of the clamping bolts and sleeves will cause a large eddy current to the iron core and cause the long-term heating of the iron core to cause the insulation aging. Prevent inadvertent damage to the insulation during maintenance: When repairing the core of the transformer, care should be taken to protect the coil or insulation sleeve, and if any damage is found, it should be handled in time.
The internal contacts of the coil are not in good contact. The connection points between the coils, the contacts leading to the high and low voltage side bushings, and the fulcrum points on the tap changer will cause poor contact, which will cause local overheating, damage to insulation, short circuit or open circuit. The high-temperature arc generated at this time will decompose the insulating oil, generate a large amount of gas, and increase the pressure in the transformer. When the pressure exceeds the protection value of the gas breaker without tripping, an explosion will occur.
The short-circuit of the coil or load of the electric furnace transformer will cause a considerable short-circuit current. If the protection system fails or the protection setting is too large, the transformer may be burned. To this end, reliable short-circuit protection must be installed. Maintain good grounding: For low-voltage systems with protective zero connection, the neutral point on the low-voltage side of the transformer should be directly grounded. When the three-phase load is unbalanced, a current will appear on the neutral line. When this current is too large and the contact resistance is high, the ground point will become hot and ignite the surrounding flammable materials.
Therefore, the partial discharge of the transformer is small, and at the same time, it has a higher electric strength under the same insulation size. Self-extinguishing even after being lit by an open flame. It does not contain any toxins, and even after burning, it does not release harmful gases. The temperature of the burning smoke is not high and the transparency is high. In addition, it will not cause harm to people, equipment and the environment during manufacturing, transportation, storage and operation.