Precautions for operation and maintenance of electric furnace transformer
In the process of storage, transportation or operation and maintenance of transformer insulating oil, if the oil quality is poor or there are too many impurities or moisture, the dielectric strength will decrease. When the dielectric strength decreases to a certain value, the transformer will be short-circuited and cause sparks, arcs or Risk temperature. Therefore, the oil quality of the transformer should be checked regularly during operation, and the unqualified oil should be replaced in time.
In order to prevent the aging and damage of the iron core insulation layer of the electric furnace transformer: the aging of the iron core insulation layer or the damage of the fastening bolt sleeve will cause the iron core to generate large eddy currents, which will cause eddy currents. Long-term heating of the iron core will cause insulation aging. In order to prevent accidental damage to the insulation during maintenance: When checking and repairing the hanging core of the transformer, please pay attention to the maintenance of the coil or insulating sleeve. If scratches are found, please deal with them in time.
The internal joints of the coils, the connection points between the coils, the contacts leading to the high and low voltage side bushings, and the fulcrum on the tap changer are poorly touched, which will cause local overheating, damage to the insulation and lead to short circuits or short circuits. Open circuit. High temperature generated at this moment The arc will break apart the insulating oil, generate a lot of gas, and add pressure in the transformer. When the pressure exceeds the maintenance setting of the gas circuit breaker without tripping, an explosion will occur.
If the coil or load of the electric furnace transformer is short-circuited, the transformer will receive a considerable short-circuit current. If the maintenance system is faulty or the maintenance setting is too large, the transformer may be burned. Therefore, a reliable short-circuit protection device should be installed. Maintain good grounding: For the use and maintenance of low-voltage systems connected to zero, the neutral point of the low-voltage side of the transformer should be directly grounded. When the 3-phase load is unbalanced, the current will appear on the zero line. When the current is too large and the touch resistance is large, the high temperature will Combustible materials appearing at the pick-up address and lit around.
Therefore, the partial discharge of the transformer is small, and at the same time, it has a high electrical strength under the same insulation scale. Even if it is ignited by an open flame, it will self-extinguish. It does not contain any toxins, and even if it is burned, it will not release harmful Gas. The flue gas of incineration is not high in temperature and high in transparency. In addition, it will not cause damage to personnel, equipment and the environment during manufacturing, transportation, storage and operation.