Dry type transformer is skilled in maintenance and maintenance, for dry type transformer should be enhanced unceasingly of dry type transformer maintenance and maintenance of the basic ways and methods, the dry type transformer repair and maintenance of common basic steps is to constantly improve, but also to achieve dry type transformer maintenance and maintenance of the basic ways and methods, for the manufacturer to have specialized technical personnel to operate, and the operation of the frequency and time, so the dry type transformer maintenance and maintenance of the basic method is as follows:
Dry transformer maintenance should be checked whether the dry transformer ground is good, whether the ground wire is corrupt, serious corruption should be replaced; Tighten the lead terminals, pins, grounding screws and connecting bus screws; Be sure to clean the dust around and on the accessories of the dry-type transformer during maintenance, and check whether the fire fighting facilities and ventilation system are good. If there is any problem with the cooling fan and the temperature controller is defective, disconnect the ground switch on the high voltage side, lock the high voltage open joint comb, and measure the insulation resistance with a 2500V rocking meter. Measured value compared with the dry type transformer before they leave the factory, the insulation resistance should not be less than 70% of the raw data when delivery from factory, if not up to standard shall report immediately disposal, close high side grounding switch again, let dry type transformer discharge, check the transformer room and dry type transformer for legacy tools, evacuate the scene, detailed doing dry type transformer maintenance electrician personnel commissioning records.
Dry transformer maintenance precautions:
One, prevent dry transformer overload operation: if long-term overload operation, will cause coil heating, insulation gradually aging. When a dry transformer is in operation, its coils and coils generate copper and iron losses, which are converted into heat energy, causing the core and coils of the dry transformer to heat up. If the temperature exceeds the allowable value for a long time, the insulation will gradually lose mechanical elasticity and make the insulation aging.
Two, check the exhaler, if the lack of oil regularly refueling. Monitoring the upper oil temperature in the operation of the dry transformer cannot guarantee the safe operation of the dry transformer. It is also necessary to monitor the temperature difference between the upper oil temperature and the cooling air - namely, the temperature rise. The difference between the temperature of the dry transformer and the temperature of the surrounding air is called the temperature rise of the dry transformer
Reasonable Capacity During normal operation, the power load borne by the dry type transformer shall be about 75-90% of the rated capacity of the dry type transformer.
There are two kinds of overload: normal overload and accident overload. Normal overload is caused by an increase in electricity consumption under normal power supply. It will increase the temperature of dry-type transformer, lead to accelerated insulation aging of dry-type transformer and decrease its service life. Therefore, overload operation is generally not allowed. Under special circumstances, the dry-type transformer may be overloaded within a short period of time, but shall not exceed 30% of the rated load in winter and 15% of the rated load in summer. In addition, the overload capacity of the dry-type transformer should be determined according to the temperature rise of the dry-type transformer and the manufacturer's regulations. When an accident occurs in the power system or user substation, in order to ensure the continuous power supply to important equipment, dry transformer is allowed to run under excessive load for a short time, that is, the accident overload, which will cause the coil temperature to exceed the allowable value, so the insulation will age faster than the normal condition. However, the chance of accident overload is less, in general dry type transformer is underload operation, so a short period of overload caused damage to the insulation of dry type transformer. The time and multiple of the accident overload shall be executed according to the manufacturer's regulations.
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