1. Prevent the overload operation of the transformer: If the transformer is overloaded for a long time, it will cause the coil to heat up, gradually aging the insulation, causing short circuit between gates or to ground and decomposition of oil;

2. Prevent the aging and damage of the transformer core insulation: aging of the core insulation or damage to the entire clamping bolt casing will cause large eddy currents in the core, and long-term heating of the core will cause insulation aging;

3. Prevent accidental damage to the insulation during maintenance: When overhauling the hanging core of the transformer, attention should be paid to protecting the coil or insulating sleeve. If any scratch damage is found, deal with it in time;

4. The maximum unbalanced current of the low-voltage transformer shall not exceed 25% of the rated value; the allowable range of the transformer power supply voltage change is plus or minus 5% of the rated voltage; 

5. Ensure that the wires are in good contact: Poor contact between the internal connectors of the coils, 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 local overheating, damage to the insulation, and short circuits. or broken circuit. The high-temperature arc generated at this time will decompose the insulating oil, produce a large amount of gas, and increase the internal pressure of the transformer. When the pressure exceeds the protection setting value of the gas breaker without tripping, an explosion will occur;

6. Maintain good grounding: For low-voltage systems that adopt 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, current will appear on the neutral line. When this current is too large and the contact resistance is large, high temperatures will occur at the grounding point, igniting surrounding combustible materials;

7. Prevent high temperature: Temperature changes should be monitored when the transformer is running. If the transformer coil wire is Class A insulated, the insulator is mainly paper and cotton yarn. The temperature has a great impact on the insulation and service life. For every 8°C increase in temperature, the insulation life will be reduced by about 50%. Therefore, when the transformer is running, good ventilation and cooling must be maintained. If necessary, forced ventilation can be used to reduce the temperature rise of the transformer.