The transformer is a static device that operates continuously, which is more reliable in operation and has less chance of failure. However, since most of the transformers are installed outdoors, and are affected by the load during operation and the short-circuit fault of the power system, various faults and abnormal conditions will inevitably occur during the operation.
According to the nature of maintenance work, transformer maintenance is divided into major repairs and minor repairs. It is customary for oil-immersed transformers to be overhauled on the side that needs to drain the oil and hang the core (or lift the bell jar) for maintenance. Carrying out oil treatment is called minor repairs. Next, let's learn more about the routine maintenance process of transformers and the technological process of overhaul projects with the editor of www.toeta.cn.
First, the conventional transformer maintenance process
1. Clean the casing and check the porcelain casing for discharge marks and damage:
2. Check whether the fastening bolts at the top of the casing are loose. Whether it is overheated;
3. Clean accessories such as transformer oil tank and oil storage tank, safety air passage and pressure regulating device;
4. Check the dust and other debris deposited in the valve cover of the pressure relief valve;
5. Check whether the oil level of the oil tanks is normal, whether the oil level gauge is in good condition and clean, and discharge the oil in the sewage collection basin;
6. Check the respirator and replace the desiccant that has failed and discolored:
7. Supplement the insulating oil of the transformer body and the oil-filled bushing;
8. Check whether the radiator has oil leakage and whether the cooling fan is normal;
9. Check the thermometer measuring the oil temperature of the upper layer;
10. Check whether the gas relay has oil leakage, whether the valve opening and closing is flexible and reliable, and the insulation of the control cable is good:
11. Check and deal with the grounding wire of the transformer shell and the neutral point grounding device:
12. Check the operation control circuit of the tap changer, the transmission part and its contact action, and clean the inside of the operation box;
13. Take oil samples from the transformer body and oil-filled bushings for simplified analysis, and take oil samples from the transformer body and capacitive bushings for chromatographic analysis;
14. Deal with defects such as seepage and oil leakage that can be eliminated on the spot;
15. Carry out electrical tests for specified items.
