How to solve the abnormal noise of dry-type transformer
Writer： Hengfeng you electric Time：2023-04-11 views：times
There are also many problems with the sound of dry-type transformers. The more common one is the hum of dry-type transformers. what is the reason? In such a situation, how should we deal with it? Let’s take a look at the main process of handling the hum of dry-type transformers with the editor of Hengfengyou Dry-type Transformer Factory:
Dry-type transformer announces the method/process of buzzing
1, device problem
Reason: Improper installation will aggravate the vibration of the transformer and amplify the noise of the transformer.
Discrimination method:
1) The foundation of the transformer is not strong or flat (one corner is suspended), or the bottom plate is too thin
2) The use of channel steel device transformer will add noise
Treatment plan:
1) The original installation method is revised by the installation unit.
2) Anti-vibration rubber pads are installed under the transformer trolley to deal with part of the noise.
2, voltage problem
Reason: High voltage will overexcite the transformer, and the noise will increase and sharp, which will directly affect the noise of the transformer.
Judgment method: First look at the low-voltage output voltage, not the voltmeter on the low-voltage cabinet. The voltmeter is just an indicator, it should be measured with a more accurate multimeter.
Solution: Now the city's 10KV voltage is on the high side. According to the output voltage of the low-voltage side, the tap gear should be placed in the appropriate gear at this time. Under the premise of ensuring the quality of low-voltage power supply, try to increase the high-voltage tap (low-voltage output voltage is reduced) to eliminate the overexcitation of the transformer and reduce the noise of the transformer.
3, the impact of the installation environment
Reason: The operating environment affects the noise of the transformer, and the unfavorable environment increases the noise of the transformer by 3dB～7dB.
Discrimination method:
1) The transformer room is very large and empty, with no other equipment and echo.
2) The transformer is too close to the wall, less than 1 meter. The transformer is placed at the corner, and the wall reflection noise is superimposed on the transformer noise, adding noise
3) The original oil-type transformer, and the replacement of the dry-type transformer will affect the noise of the transformer. The reason is that the crude oil conversion chamber is relatively small, with oil leakage chambers and oil leakage holes. The transformer is like a speaker.
Solution: Some sound-absorbing materials can be properly installed indoors.
4. Resonance problems of electric fans, cabinets and other components
Reason: Resonance of electric fans, cabinets and other parts will cause noise, which is generally mistaken for noise from transformers.
Discrimination 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 any change, it indicates that the enclosure is resonating.
2) Electric fans: Use a long, dry mallet to hold the shell of each electric fan to see if the noise changes. If it changes, it means that the fan is resonating.
3) Other parts: Use dry long mallets on top of the transformer parts (such as wheels, fan brackets, etc.) to see if the noise changes. If there is a change, the parts will resonate.
Treatment plan:
1) Check whether the aluminum plate (or steel plate) of the shell is loose, and it may be deformed during installation. Need to tighten the screws of the shell, fix the aluminum plate of the shell, and batch the deformed part.
5. The nature of the load problem
Cause: The voltage waveform of the transformer is distorted (such as resonance) and noise occurs.
Discrimination method:
1) In addition to the noise of the transformer itself, the noise is also mixed with "click, click" noise.
2) During operation, the noise of the transformer will suddenly become louder and will return to normal soon.
3) Check whether there are rectifier equipment and variable frequency equipment in the load.
Treatment plan: The user can consider the rated equipment of the device to reduce harmonics.
6. Transformer phase loss problem
Reason: The transformer cannot be normally excited and noise occurs.
How to solve the abnormal noise of dry-type transformer
Treatment plan:
1) Power off the transformer, check whether the power supply is missing one phase;
2) Check whether the transformer high-voltage fuse is blown in one phase;
The above is the handling method and detailed process of common dry-type transformer hum problem, for your reference. If you have other questions about common dry-type transformers, you can call +86 15853252696 for further consultation.
