The noise of dry-type transformer belongs to low-frequency noise, which is one of the common noise sources in residential quarters and public buildings. For dry-type transformer noise, vibration reduction and sound insulation measures are usually adopted to control, which can achieve better noise reduction effect. Here is the noise control scheme for dry-type transformer.
I. Transformer vibration treatment
The vibration transmission of transformer can be controlled below 0.2% by using vibration reduction platform and low frequency vibration isolation treatment, so as to reduce the building structure noise caused by vibration transmission of transformer.
Second, bus cascade damping treatment
Soft connection handling for bus linings. The electromagnetic noise vibration may be transmitted to the building structure through a row for the copper row of the outlet slot frame of the hard-installed low-voltage bus, and it needs to be changed into a flexible wire connection in the middle of noise reduction.
Iii. Vibration reduction treatment of grounding plate
The fixed hard connection between the grounding iron plate and the transformer is changed. The original vibration of the transformer will be transmitted from the iron plate to the reinforcement in the cement and low-frequency noise will be generated. Therefore, it is also necessary to transform the transformer into a soft connection.
4. Vibration reduction treatment of bridge frame
Change the hard connection between bus bridge and transformer, and do vibration reduction treatment at the bridge.
Five, the machine room sound insulation treatment
The transformer room is soundproofed mainly from the three aspects of doors and Windows, ventilation and ventilation openings, and the ground. Sound insulation products such as soundproof doors and Windows, soundproof tubes, and floating floor damping pads are used to achieve sound insulation and noise reduction effect.
Decided in a case of structure vibration and airborne noise control, main measures on the basis of Hanks transformer vibration platform installation, bus replacement for weaving soft and sound insulation door installation, governance effect is as follows: transformer room adjacent room internal 47 db before modification, and modification after 28 decibels, and the background noise level, almost couldn't feel the low-frequency hum noise. Before the transformation, the transformer room phase door 57 dB, after the transformation 40 dB, and the background noise level, almost feel out of the low-frequency hum noise.
The dry type transformer has a wide range of use, so it can often receive the noise reduction of this project. For transformer noise control, the noise reduction scheme should be determined according to the main type of transformer noise. Only targeted treatment can achieve better results.
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