Cast Coil Dry Type Transformer Preventive Test

The safe use of cast coil dry type transformer is inseparable. For the safe use of dry-type transformers, various operations should be paid attention to. The following introduces the issues that should be paid attention to in the safe operation of dry-type transformers from several aspects.

1. Network operation

1.1 After the auxiliary protection device and monitoring system are grounded and qualified, the dry-type transformer should be operated under no-load first, and the protection system should be checked and adjusted after three times of impact closing.

1.2 After the product leaves the factory, the tap positions of the high voltage side are connected according to the rated value position. Voltage adjustment is required during operation, and the corresponding tap connection can be made according to the tap voltage indicated on the product nameplate, and it must be done when the power supply of the dry-type transformer is cut off.

1.3 The cast coil dry type transformer adopts a temperature controller, and the temperature measuring element is embedded in the upper end of the low-voltage coil, which can automatically detect and display the respective working temperatures of the three-phase coils. When the coil temperature reaches the design temperature, the thermometer can automatically start the fan, stop the fan, alarm, trip, and the set temperature can be adjusted by the user according to the manual of the thermostat.

2. Maintenance

After the dry-type transformer has been running for a period of time, the power should be cut off and the following necessary inspections and maintenance should be carried out.

2.1 Check coils, iron cores, sealing wires, tap terminals and fasteners in various parts to check for damage, deformation, loosening, discoloration, overheating marks and corrosion. If there is any abnormal situation, it should be identified. reasons and take necessary measures.

2.2 Remove the dust on the dry-type transformer. All parts that can be touched by hands should be wiped with a dry cloth, but no volatile cleaners should be used. For the hard-to-wipe parts inside the iron core coil, use compressed air to blow off the dust.

2.3 The dry-type transformer equipped with the fan should also remove the dust and soil in the fan, and check the grease of the fan bearing, and supplement or replace it if necessary.

2.4 After the inspection and maintenance is completed, before the dry-type transformer is put into operation again, it should be carefully checked whether there is any metal or non-metallic foreign matter falling, left in the coil and iron core and on the insulating parts.

3. Safety matters

3.1 The power supply of the temperature controller (and the fan) should be obtained through the switch screen, not directly connected to the dry-type transformer.

3.2 Before the cast coil dry type transformer is put into operation, the grounding system of the dry-type transformer room must be checked.

3.3 The door of the dry-type transformer shell should be closed to ensure the safety of electricity use.

3.4 The dry-type transformer room should have measures to prevent small animals from entering, so as to avoid accidents.

3.5 The staff must wear insulating shoes when entering the transformer room, pay attention to the safe distance of the electric part, and do not touch the dry-type transformer.

3.6 If it is found that the noise of the dry-type transformer suddenly increases, you should immediately pay attention to the load condition of the dry-type transformer and the voltage of the power grid, strengthen the observation of the temperature change of the dry-type transformer, and contact the relevant personnel for consultation in time.

3.7 Dry-type transformers should be checked once every 3-5 years, and some preventive tests can also be done at this time.

3.8 The installation, testing, operation and maintenance of dry-type transformers must be undertaken by qualified professionals.

The above are the main matters and main operation steps of common dry-type transformer safety operations for your reference. The safety performance of dry-type transformers should be well grasped, so as to realize the safe and stable operation of dry-type transformers, so as to improve the safety of dry-type transformers. Properly run dry-type transformers.