Resonance problems of fans, housings, and other components



■ Reason: The resonance of the fan, casing and other components will generate noise, which is generally mistaken for the noise of the transformer.


■ Judgment method:

1) Shell: Press the aluminum plate (or steel plate) of the shell with your hand to see if the noise changes. If there is a change, it means that the shell is resonating.

2) Fan: Use a dry long wooden stick to top the casing of each fan to see if the noise changes. If there is a change, it means that the fan is resonating.

3) Other parts: Use a dry long stick to top each part of the transformer (such as wheels, fan brackets, etc.) to see if the noise changes. If there is a change, it means that the parts are resonating.


■ Workaround:

 1) Check whether the aluminum plate (or steel plate) of the shell is loose, it may be deformed during installation, you need to tighten the screws of the shell, fix the aluminum plate of the shell, and correct the deformed part.

 2) To see if the fan is loose, you need to tighten the fastening bolts of the fan, and put a small piece of rubber between the fan and the fan bracket, which can solve the vibration problem of the fan.

 3) If the transformer parts are loose, they need to be fixed.




installation problem



■ Reason: Poor installation will aggravate the vibration of the transformer and amplify the noise of the transformer.


■ Judgment method:

1) The foundation of the transformer is not firm or flat (one corner is floating), or the bottom plate is too thin.

2) Putting up the transformer with channel steel will increase the noise.


■ Workaround:

1) The original installation method shall be modified by the installation unit.

2) The anti-vibration rubber pad is added under the transformer trolley to solve some noise.




Influence of installation environment



■ Reason: The operating environment affects the noise of the transformer, and the unfavorable environment increases the noise of the transformer by 3dB to 7dB.


■ Judgment method:

1) The transformer room is very large and empty, there is no other equipment, and there is an echo.

2) The transformer is too close to the wall, less than 1 meter. The transformer is placed at the corner, and the reflected noise from the wall is superimposed with the transformer noise, which increases the noise.

3) The oil transformer was originally used, and the noise of the transformer will be affected after the dry transformer is replaced. The reason is that the crude oil transformer room is relatively small, and there is an oil leakage chamber and an oil leakage hole, and the transformer is like being placed on a speaker.


■ Workaround:

Some sound-absorbing materials can be appropriately installed indoors.




The problem of busbar bridge vibration



■ Reason: Due to the large current passing through the parallel busbar, the busbar vibrates due to the leakage magnetic field. The vibration of the busbar bridge will seriously affect the noise of the transformer, which will increase the noise of the transformer by more than 15dB, which is difficult to judge. Generally, users and installation units will mistake it for the noise of the transformer.


■ Judgment method:

1) The noise varies with the size of the load.

2) Use a wooden stick to push the busbar bridge hard, if the noise changes, it is considered that the busbar bridge is resonating.

3) The busbar vibrates in the bridge, and it is useless to top it with a wooden stick. It is necessary to open the busbar bridge cover to check whether the busbar is fixed.


■ Workaround:

1) It is mainly to destroy the condition of the resonance of the busbar bridge, and tighten or loosen the boom screws.

2) Open the busbar bridge cover and fix the busbar.

3) The low-voltage outlet adopts a soft connection.

4) Please ask the manufacturer of the busbar bridge to solve it.




Transformer core self-resonance



■ Reason: There is an electromagnetic attraction between the silicon steel sheet joints and the laminations due to magnetic flux leakage.


■ Judgment method:

1) The noise of the transformer is too large, and other noises are mixed with the normal noise.

2) Transformer noise is wavy.


■ Workaround:

1) Tighten the screws on the transformer, including the screws at both ends of the clip, the through-hole screws, and the spacer screw.

2) Add anti-vibration pads under the transformer trolley to solve some noise.




Transformer coil self-resonance



■ Reason: When there is a load current passing through the winding, the magnetic leakage generated by the load current causes the vibration of the winding


■ Judgment method:

1) The noise of the transformer is too large, and the noise is relatively low.

2) When the load of the transformer reaches a certain level, noise starts to appear, sometimes it occurs and sometimes no phenomenon.


■ Workaround:

1) Tighten all the screws of the spacer to increase the axial compression force of the coil.

2) Loosen all the screws of the spacer, loosen all the bolts on the outgoing copper bar and the neutral copper bar, shake the low-voltage coil, move the high-voltage coil by 3-5 mm, and then tighten all the bolts.




Problems with the nature of the load



■ Reason: The voltage waveform of the transformer is distorted (such as resonance phenomenon), resulting in noise.


■ Judgment method:

1) In addition to the noise of the transformer itself, the noise is also mixed with "cluck, cluck" noise.

2) During the operation, the noise of the transformer will suddenly increase sharply, and it will return to normal soon.

3) Check whether the load has rectifier equipment and frequency conversion equipment.


■ Workaround:

Users can consider adding devices to reduce harmonics.

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