Troubleshooting Of Three-phase Transformers

In order to ensure the safe and reliable operation of transformers, necessary inspections and tests should be conducted before operation, and strict monitoring and regular maintenance should be carried out during operation. When there are abnormalities in the transformer, they should be detected and dealt with in a timely manner.
Before putting newly installed and overhauled transformers into operation, special attention should be paid to checking whether the oil level in the oil storage tank is normal, whether the desiccant in the moisture absorber is damp, whether the safety airway is intact, whether the tap changer position is normal, whether the cooling device is complete, whether the control circuit is good, and whether the grounding device is intact; Pay special attention to measuring insulation resistance, absorption ratio, and determining connection group in the experimental project; Special attention should be paid to the physical quantities of the transformer during operation monitoring, which should be within the rated range.
During the operation of transformers, the most common faults include winding faults, iron core faults, and partial faults in bushings and tap changers; Based on the symptoms of the malfunction, the cause should be identified and appropriate measures taken. The following table lists the common phenomena, causes, and solutions of transformer faults.