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Detecting dry-type transformer failures through abnormal sounds
Release time: 2018-03-10 Click times: 1044 times

There is noise in the dry-type transformer. If the sound of the transformer is larger than normal and there is obvious noise, but there is no obvious abnormality in the current and voltage, it may be caused by the looseness of the internal clamps or the screws pressing the iron core, which will increase the vibration of the silicon steel sheet.
When the dry-type transformer is running, there is no noise at all. This is a very normal phenomenon, but sometimes there will be a lot of noise, which means that it can be judged by the sound whether the transformer is faulty. In fact, the sound of the dry-type transformer can also be seen whether it is damaged. Generally speaking, the dry-type transformer has several problems in sound, which indicates that the dry-type transformer has failed and must be repaired. Common sound problems of dry-type transformers during operation indicate that your dry-type transformers are broken. Let's take a look at them below:

There is a sound of discharge from the dry-type transformer. If there is a partial discharge inside or on the transformer, there will be a "cracking" discharge sound in the sound blue. When this happens, if you can see a blue corona or spark near the transformer bushing at night or in rainy weather, it means that the porcelain is badly contaminated or the equipment clamp is not in good contact; if the transformer's internal discharge, If it is an electrostatic discharge of an ungrounded component or a poor contact of the tap-changer, the transformer should be further tested or deactivated.
Dry-type transformers boil water. If the sound of the transformer is mixed with water boiling sound and the temperature changes sharply and the oil level rises, it should be judged that the transformer winding has a short-circuit fault or the tap-changer is severely overheated due to poor contact. At this time, the transformer should be stopped for inspection.
There is a popping noise in the dry-type transformer. If there is an uneven cracking sound in the transformer sound, it is the breakdown of the internal or surface insulation of the transformer. At this time, the transformer should be stopped and inspected immediately.
The above sound problem is a detail that cannot be ignored. Everyone should take good care of it, otherwise it will be really difficult to use, not only the use of dry-type transformers is not good, but it may shorten the service life!

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