What Items Should Be Checked For Dry-type Transformer Interrupted Operation

Under the conditions of severe cold and humid temperatures and regional conditions, if the dry-type transformer suddenly stops running, it is necessary to check whether there is an abnormal wet cold and cold condition. If so, be sure to remove the frost from the surface to avoid thermal breakdown. In order to ensure that everything that does not endanger the insulation winding of transformers is not operated normally. If the insulation resistance value is not less than 2MΩ/1000V transformer, everything can operate normally. The heat generated by the operation of the transformer will return to the insulation resistor that is normal. Under the practical operating standards of everything that works. The temperature of the transformer itself is higher than its surrounding operating temperature, so it is not easy to reduce the insulation resistor.
Dry-type transformers in the whole process of application will often have damage conditions, dry-type transformers burn out there are many reasons, so when your dry-type transformer burns out, pay attention to the analysis of the cause of burnout, how to carry out better development grasp the dry-type transformer burnout, then will promote dry-type transformer more protective, characteristics will be more improved. What are the causes of dry-type transformer burnout? Let's analyze it carefully with the web editor:
1. The end of the dry-type transformer is damaged, and the other wire cakes are not damaged (thanks to everyone pulling the brake immediately). The dry-type transformer end insulation is usually a weaker base area, and the two cakes in front of the end of the 10kV electromagnetic coil should be insulated (the photo is not very clear, everyone looks at it themselves, it should be different from other cakes). Is it useful to look at the design and manufacturing?
2. If the production and operation are normal, then the power network repair is an inducement, dry-type transformer turns off the power, the power supply is caused by the actual operation overvoltage, I don't know how many times there is wood and open, and how many times it is broken?
3. Due to the overvoltage caused by the actual operation, the end insulation thermal breakdown occurs, resulting in a short circuit fault between turns or cakes, and damage the end of the electromagnetic coil.
4. The pressure test level of dry change is generally slightly lower than that of oil, because he operates indoors. Some power bureaus also stipulate that dry change and oil change have the same withstand voltage test level. 10kV dry change, DC withstand voltage test is 28kV, oil change is 35kV. Look at the factory nameplate is 28kV. Look at the factory nameplate This dry-type transformer is a dry-type transformer in the plateau area, and the insulation should be improved.