I believe we should all understand this truth, power transformers in use after a certain period of time will encounter some problems, but we can sometimes judge the fault through the sound of dry transformer, let’s look at it in detail.
1, lack of phase sound
When the transformer phase, if the second phase is not, send the second phase is still silent, send the third phase when there is a sound; If the third phase is disconnected, the sound does not change, as in the second phase. There are three reasons for phase deficiency:
(1）The power supply is short of a phase;
(2) transformer high voltage fuse fuse one phase;
(3) The transformer is broken by vibration (but not grounded) due to its careless transportation and fine high voltage lead.
2. Pressure regulating tap switch is not in place or poor contact
When the transformer is put into operation, if the tap switch is not in place, a large “tweet” sound will be issued, resulting in high voltage fuse fuse is broken seriously; If the tap is not in good contact, there will be a slight “squeak” spark discharge sound, once the load is increased, it may burn the tap contacts. Encounter this situation, to timely repair power outage.
3, fell into the foreign body and threaded screw loose
When the transformer clamp core threaded screw loose, the core left nut parts or transformer fell into the small metal objects, the transformer will be issued “ding-dang” knocking sound or “hoo… Breathe…” The wind and the “squeak, squeak, squeak” sound like the magnet pulling the shim, while the voltage, current and temperature of the transformer are normal. This kind of situation generally does not affect the normal operation of the transformer, can wait until the power failure for processing.
The above content is about the dry transformer sound judgment fault some introduction, DO not know everyone is clear?
Post time: Sep-11-2021
