1. Pay attention to the sound of the transformer
In the normal operation of the transformer, due to the influence of alternating magnetic flux, the silicon steel sheet will emit a uniform “click†sound, which has a direct relationship with the magnitude of the voltage and current and whether the three-phase load is balanced. Once the transformer fails, the sound becomes louder; it is accompanied by noise. Therefore, the operation can be judged based on the sound of the transformer operation.
2. The level of the oil level and the inspection of the oil
The normal oil level of the transformer should fluctuate between the upper and lower oil level lines of the oil level. High or low oil levels are not normal. When the transformer is overloaded, the oil will be thermally expanded and the oil level will rise. At this time, the cause of excessive current should be checked. When the transformer leaks oil, the oil level drops. When it falls below the cover, it will accelerate the aging of the oil or it is damp . When the windings are exposed to the oil surface, insulation performance will be reduced, and breakdown or leakage to earth or ground will be easily caused. When the oil level is lower than the upper mouth of the heat pipe, the oil stops flowing, and the heat cannot be dissipated, so that the temperature rises and the winding is burned. After the transformer is operated, the normal color of the transformer oil is light red or dark yellow. If the oil is deteriorated, the color will be darkened and have different colors. If the oil is dark, it means that the oil is seriously carbonized and should not be used again. The oil quality inspection of transformer oil should be carried out every three years.
3. Temperature monitoring When the transformer is in normal operation, the upper oil temperature should not exceed 95°C, usually not exceed 85°C, and the temperature rise must not exceed 55°C; the reason for the transformer's high degree of excess is that, in addition to poor manufacturing, it may also be a transformer. Caused by load, poor heat dissipation or internal failure; for transformers without a thermometer, a mercury thermometer can be attached to the transformer housing to measure the temperature; generally it cannot exceed 75°C. Transformers that exceed the rated current during operation are overloaded. Long-term overload operation of the transformer will increase the temperature, deteriorate the insulation performance, and reduce the service life of the transformer.
4 high voltage fuse is normal
(1) The possible causes of transformer low-voltage fuse blowing are: 1 buried wire, short-circuit overhead line short circuit; 2 transformer overload; 3 insulation damage or short circuit of electrical equipment; 4 fuse selection is too small, the quality of the melt itself is not Good, improper fuse installation, etc.
(2) The possible causes of transformer high-voltage fuse blowing are: 1 internal breakdown of the transformer insulation breakdown; 2 low-voltage equipment failure, but the low-voltage fuse is not broken; 3 if the arrester is installed in the outdoor drop fuse and transformer, lightning It may also be blown off by the high-voltage fuses; 4 the fuses are selected to be too small, the quality of the melt itself is not good, and the fuse is found to be improperly installed. The cause should be ascertained according to the accident phenomenon. After troubleshooting, the fuse can be replaced and put into operation again.
In the normal operation of the transformer, due to the influence of alternating magnetic flux, the silicon steel sheet will emit a uniform “click†sound, which has a direct relationship with the magnitude of the voltage and current and whether the three-phase load is balanced. Once the transformer fails, the sound becomes louder; it is accompanied by noise. Therefore, the operation can be judged based on the sound of the transformer operation.
2. The level of the oil level and the inspection of the oil
The normal oil level of the transformer should fluctuate between the upper and lower oil level lines of the oil level. High or low oil levels are not normal. When the transformer is overloaded, the oil will be thermally expanded and the oil level will rise. At this time, the cause of excessive current should be checked. When the transformer leaks oil, the oil level drops. When it falls below the cover, it will accelerate the aging of the oil or it is damp . When the windings are exposed to the oil surface, insulation performance will be reduced, and breakdown or leakage to earth or ground will be easily caused. When the oil level is lower than the upper mouth of the heat pipe, the oil stops flowing, and the heat cannot be dissipated, so that the temperature rises and the winding is burned. After the transformer is operated, the normal color of the transformer oil is light red or dark yellow. If the oil is deteriorated, the color will be darkened and have different colors. If the oil is dark, it means that the oil is seriously carbonized and should not be used again. The oil quality inspection of transformer oil should be carried out every three years.
3. Temperature monitoring When the transformer is in normal operation, the upper oil temperature should not exceed 95°C, usually not exceed 85°C, and the temperature rise must not exceed 55°C; the reason for the transformer's high degree of excess is that, in addition to poor manufacturing, it may also be a transformer. Caused by load, poor heat dissipation or internal failure; for transformers without a thermometer, a mercury thermometer can be attached to the transformer housing to measure the temperature; generally it cannot exceed 75°C. Transformers that exceed the rated current during operation are overloaded. Long-term overload operation of the transformer will increase the temperature, deteriorate the insulation performance, and reduce the service life of the transformer.
4 high voltage fuse is normal
(1) The possible causes of transformer low-voltage fuse blowing are: 1 buried wire, short-circuit overhead line short circuit; 2 transformer overload; 3 insulation damage or short circuit of electrical equipment; 4 fuse selection is too small, the quality of the melt itself is not Good, improper fuse installation, etc.
(2) The possible causes of transformer high-voltage fuse blowing are: 1 internal breakdown of the transformer insulation breakdown; 2 low-voltage equipment failure, but the low-voltage fuse is not broken; 3 if the arrester is installed in the outdoor drop fuse and transformer, lightning It may also be blown off by the high-voltage fuses; 4 the fuses are selected to be too small, the quality of the melt itself is not good, and the fuse is found to be improperly installed. The cause should be ascertained according to the accident phenomenon. After troubleshooting, the fuse can be replaced and put into operation again.
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