Low-frequency transformers are one of the common devices used in power systems to convert electrical energy from one voltage level to another. Due to long-term use and the influence of external environment and other factors, low-frequency transformers often have some problems. This paper will introduce the common problems of low-frequency transformers, and provide corresponding solutions.

The low-frequency transformer will generate a certain amount of heat during the working process, but if the temperature rise is too high, it may lead to the aging of insulation materials, the decline of insulation strength, and even cause serious consequences such as fire.

Solution: 1. Check the cooling system of the transformer regularly to ensure that the cooling effect of the cooler is good. 2. Check the insulation material of the transformer. If it is aging or damaged, replace it in time. 3. Increase the transformer ventilation volume to improve the heat dissipation effect.

Insulation breakdown refers to the failure of insulation materials to withstand voltage and damage, resulting in abnormal current flow, which may cause fire or other safety accidents.

Solution: 1. Regularly carry out insulation resistance test to ensure the quality of insulation materials. 2. Avoid transformer overload operation to reduce the load of insulation materials. 3. Regularly clean the transformer surface to prevent dust or dirt from affecting the insulation material.

The short circuit fault refers to the short circuit in the winding or insulation material of the transformer, resulting in an abnormal increase in current, which may cause fire or equipment damage.

Solution: 1. Check the winding of the transformer regularly. If the winding is found loose or short circuit, repair or replace it in time. 2. Increase the overload protection device of the transformer to cut off the power supply in time to avoid the expansion of short circuit fault.

Insulation oil is a commonly used insulation material in low-frequency transformers, which will age after long-term use, leading to a decline in insulation performance.

Solution: 1. Check the insulation strength of the insulation oil regularly. If it is found that the insulation strength decreases, replace the insulation oil in time. 2. Control the operating temperature of the transformer to avoid overheating of the insulation oil.

Some problems often occur in the use of low-frequency transformers, such as high temperature rise, insulation breakdown, short circuit fault and insulation oil aging. In order to ensure the normal operation and safety of the transformer, we should regularly check and maintain the transformer, and take corresponding measures to reduce the occurrence of failures. Only by keeping the transformer in good condition can we ensure the stable operation of the power system.