WhenEquipment transformerWhen running and working, there is almost no sound, no noise, and it is very quiet. However, various problems also occur in practical applications, and various problems occur in sound. The common problem is that the sound of the transformer is loud and loud, which is a typical problem. So what is the cause of this problem?
（1) Excessive grid voltage will increase the working magnetic density of the transformer, resulting in increased product noise. At this time, the noise of the product can be reduced by properly adjusting the voltage of the transformer tap.
（2) When the equipment transformer is equipped with silicon controlled rectifier equipment, the current and voltage of the low-voltage side circuit contain a large number of higher harmonics. If the transformer is usedYynOWiring mode, due to the high-voltage side usingYThe wiring method and there is no neutral line, so the third harmonic current cannot flow, which distorts the main magnetic flux in the iron core. In addition to the basic magnetic flux, it also contains a large number of higher harmonics, especially the third harmonic component is large, so the noise increases significantly. Therefore, it is possible to passDynllConnected transformer andSCRAn isolation transformer is installed between the devices to reduce the noise of the product.
（3) When the three-phase load of the equipment transformer is severely unbalanced, a large zero-sequence current will appear on the low-voltage side. A large zero-sequence magnetic flux is generated in the magnetic core. The zero sequence flux is a sine wave at the fundamental frequency. Its presence will change the magnitude and phase of each magnetic flux, thereby severely increasing or saturating one or two magnetic densities of the iron core, thereby significantly increasing transformer noise. withDynllThe connected transformer can reduce noise.
（4) When the iron core of the equipment transformer is grounded at multiple points or the local iron core chip is short-circuited, the local magnetic flux of the iron core will be distorted, resulting in a significant increase in transformer noise. For this case, as long as the iron core is eliminated, the noise of the transformer can be reduced.
The above is the main reason for the loud sound of the main equipment transformer. You can find a solution based on the above reasons. The above information is for reference only. For more information, please pay attention to our website for consultation!