The three-phase temperature of dry-type transformer makes its important performance. Only when the three-phase temperature of dry-type transformer is stable, its operation will be more safe and stable. Therefore, in the operation of dry-type transformer, the three-phase temperature needs to be kept in balance. However, what is the problem of large temperature difference meter sometimes? Let's analyze it as follows:
First of all, make sure that the temperature difference of 30 degrees you are waiting for and how to get it. The accuracy of the measurement method should be confirmed first. Otherwise, there will be no precondition.
2. In your case, it is likely that the load of phase A is heavier. The C phase load is lower. If that's the case, it's basically 10 degrees off. It's still normal.
3. If the three-phase load is balanced, the difference is 30 degrees. Then you should first check the external conditions of the transformer, such as the cooling environment, including ventilation, whether the thermometer temperature probe is inserted properly, and so on.
4. If everything is normal, the difference is 30 degrees. There's a problem.
5. You should change the position of thermometer probe first (e.g. phase a to phase C). Of course, it's going to be blackout. I think most of the time it's probably a thermometer problem.
6. If there is still a problem, check the condition of the coil. This is very difficult to deal with (a) whether the insulation resistance of the transformer is qualified; B. measure the DC resistance of the transformer to see if there is a turn to turn short circuit.
7. The second reason is that it is almost impossible to happen; the iron core of the transformer is not working properly, which is only possible in theory, but almost not in fact. If there is nothing wrong with anything else, you can only update the transformer if you only suspect it. )
The above is the reason analysis of large difference of three-phase temperature of dry-type transformer. In the operation of dry-type transformer, we should pay attention to the transformer with operating temperature to ensure the stability and safety of dry-type transformer operation.
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