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Oil-Immersed Transformer Maintenance Inspection Content

Nov. 02, 2020

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Oil-immersed transformers are the key power distribution equipment transformers and are one of the most widely used substation equipment in power companies today. During the entire application process of power engineering, electric welders need to perform regular maintenance and inspections to facilitate stronger To ensure the normal operation of all machinery and equipment, to ensure early detection and early resolution of common faults, and to improve the efficiency of machinery and equipment applications. So what are the maintenance and inspection contents of oil-immersed transformers? Transformer manufacturers will introduce in detail the maintenance and inspection of oil-immersed transformers.

Oil-Immersed Transformer

1. Check whether the oil volume and oil tone of the transformer is normal and whether there is oil leakage

The oil quantity should be within 1/4~3/4 of the scale of the oil gauge. If the oil level is too low, check for oil leakage. If the oil leaks, power off and repair it. If there is no oil leakage, the oil should be supplied to the required oil level. When supplying oil, pay attention to the temperature value indicated on the scale of the oil gauge, and add the oil to the proper amount according to the average temperature at that time. The oil inspection is carried out by carefully observing the color of the oil. The light yellow color of the new oil turns into a light bright red after a period of operation. The oil that produces embrittlement and more severe air oxidation is dark red. After short-circuit failure and thermal breakdown of the insulating layer, the oil contains carbon and the oil turns black.

2. Check whether the high-voltage and low-voltage bushings are cleaned, whether there are cracks, knocks, and charge and discharge marks

Surface cleaning is a prerequisite for the casing to maintain the compressive strength of the insulating layer. When there is floating dust in the casing area, it will be stained with water in the rain or mist, resulting in a leakage current channel. Therefore, the floating dust on the casing should be cleaned up on time. Cracks in the bushing due to impact or charging and discharging will also reduce the compressive strength of its insulating layer, leading to charging and discharging. Therefore, if the casing is found to have cracks or knocks, it should be replaced immediately.

3. Check if the transformer operating temperature exceeds the requirements

The temperature rise during the operation of the transformer is mainly caused by its own heat. Generally speaking, the heavier the transformer load, the greater the amount of current passing through the electromagnetic coil during operation, the greater the heating value, and the higher the operating temperature. The higher the temperature, the more embrittlement of the insulating layer and the reduction of service life. According to the requirements, when the transformer is in normal operation, the temperature of the top oil in the automobile fuel tank should not exceed 85~95℃. If the oil temperature is too high, the heating inside the transformer will be aggravated, and the heat dissipation of the transformer heat pipe will be poor, need to withdraw from the operation quickly, find out the cause, and carry out maintenance.


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