Mainly from the following several aspects to guarantee the safety of oil-immersed transformer:

1. Daily maintenance on a regular basis, timely transformer oil and dust on the high and low pressure casing, to prevent pollution flashover discharging wet and rainy weather, cause casing interphase short circuit, leading to high voltage fuse fusing.

2. Regularly to observe the oil level and oil color of oil-immersed transformer, regularly test the oil temperature, especially the load change is big, big temperature difference, harsh weather should be the number that tour of oil-immersed distribution transformer running top oil temperature is not higher than 95 ℃, the temperature rise shall not exceed 55 ℃, in order to prevent the deterioration of winding and oil tachycardia, top oil temperature rise is often more than 45 ℃.

3. Monitoring of oil-immersed transformer insulation resistance, check whether the lead is firm, paying special attention to the low voltage wire joint contact are in good condition, the temperature is abnormal.

4. Strengthen the electricity load in peak season, strengthens to each measurement with the changeable load, increase number of measurement when necessary, to adjust unbalanced three phase current transformer, prevent the neutral current is too large burn out due to lead the downstream equipment damage and the damage of transformer.