Dry-type transformers are easily overlooked during maintenance.

Many people will ask three-phase transformers, dry transformers need to do what ah? Do you need to do regular maintenance? The answer is that, if necessary, maintenance and regular inspections are required. As long as this is done, the life of the transformer will be extended and the chance of problems will be reduced.

1, dry-type transformer maintenance, first clean the porcelain casing and shell, then check the shell, gasket, porcelain casing for cracks, discharge traces or whether the rubber mat aging, whether the deformation of the cable and the bus, there is a crack Should be replaced.

2. Check whether the contact surface of the busbar is kept clean. The contact surface should be deoxidized and coated with electric compound grease.

3. Check whether the grounding of the transformer is good, whether the ground wire is corroded, and where the corrosion is serious, replace it.

4. Fasten the lead terminals, pins, grounding screws, and connection bus screws. If there is looseness, remove the screws, or use a thin flat 锉 light contact surface, or replace the spring washers or screws until the contact is good.

5. Clean the dust around transformers and accessories and check if the firefighting facilities and ventilation system are good.

6. Use 2500V megger to measure the high-side insulation resistance, and compared with the measured value before leaving the factory, the insulation resistance should not be less than 70% of the original data from the factory. If it is unqualified, it should be reported in time.

After the transformers have been tested, many people feel it is OK. In fact, they are wrong. Transformer fans and temperature control units that are used to run transformers are also required to be tested because they are transformers' detectors and protectors. Without them, transformers Life will be greatly shortened, so we must not only perform maintenance on the transformer, but also on the fan and temperature control unit to detect the normal operation of the fan, temperature control unit temperature is displayed accurately, set the temperature limit position is The entire line can be reliably connected. This is what we will check for maintenance.