Precautions in the safe operation of power transformers: Power transformers mainly reduce the high-voltage power of the power grid to a voltage of 6000 volts (V) or 380 volts (V) that can be directly used to supply power to the electrical equipment.
If an overload or short circuit occurs inside the transformer, the insulating material or insulating oil will be decomposed by high temperature or sparking action, and will expand and vaporize, causing the internal pressure of the transformer to increase sharply, which may cause the transformer casing to explode. A large amount of insulating oil is ejected and burned. The flow will further increase the risk of fire.
Therefore, the power transformer should pay attention to the following items during operation: (1) It can not be overloaded: long-term overload operation will cause the coil to heat up, causing the insulation to gradually age and cause short circuit. (2) Regularly check the insulating oil quality: the oil quality should be tested regularly, and the unqualified oil should be replaced in time, or other measures should be taken. (3) Prevent the aging damage of the transformer core insulation, and the insulation aging caused by the long-term heating of the iron core. (4) Prevent inadvertent damage to the insulation due to maintenance. If it is found to be damaged, it will be disposed of in time. (5) Ensure that the wires are in good contact and the contact is poor and local overheating occurs. (6) To prevent lightning strikes, the transformer will burn out due to breakdown of insulation. (7) Short circuit protection: A short circuit occurs in the transformer coil or load. If the protection system fails or the protection setting is too large, the transformer may be burnt. A reliable short circuit protection is required for this purpose. (8) Well-protected grounding. (9) Ventilation and cooling: If the transformer coil wire is Class A insulation, the insulator is mainly paper and cotton yarn. For every 8 °C increase in temperature, the insulation life is reduced by about half; the normal temperature of the transformer is below 90 °C, and the service life is about 20 years; if the temperature rises to 105 °C, the service life is 7 years. The transformer is operated to maintain good ventilation and cooling.
If an overload or short circuit occurs inside the transformer, the insulating material or insulating oil will be decomposed by high temperature or sparking action, and will expand and vaporize, causing the internal pressure of the transformer to increase sharply, which may cause the transformer casing to explode. A large amount of insulating oil is ejected and burned. The flow will further increase the risk of fire.
Therefore, the power transformer should pay attention to the following items during operation: (1) It can not be overloaded: long-term overload operation will cause the coil to heat up, causing the insulation to gradually age and cause short circuit. (2) Regularly check the insulating oil quality: the oil quality should be tested regularly, and the unqualified oil should be replaced in time, or other measures should be taken. (3) Prevent the aging damage of the transformer core insulation, and the insulation aging caused by the long-term heating of the iron core. (4) Prevent inadvertent damage to the insulation due to maintenance. If it is found to be damaged, it will be disposed of in time. (5) Ensure that the wires are in good contact and the contact is poor and local overheating occurs. (6) To prevent lightning strikes, the transformer will burn out due to breakdown of insulation. (7) Short circuit protection: A short circuit occurs in the transformer coil or load. If the protection system fails or the protection setting is too large, the transformer may be burnt. A reliable short circuit protection is required for this purpose. (8) Well-protected grounding. (9) Ventilation and cooling: If the transformer coil wire is Class A insulation, the insulator is mainly paper and cotton yarn. For every 8 °C increase in temperature, the insulation life is reduced by about half; the normal temperature of the transformer is below 90 °C, and the service life is about 20 years; if the temperature rises to 105 °C, the service life is 7 years. The transformer is operated to maintain good ventilation and cooling.
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