The noise standard for amorphous alloy transformers is usually not more than 65dB when the capacity is 2500 kVA or below. Its noise level is affected by factors such as material characteristics, design parameters, and structural optimization. The specific analysis is as follows:

　　1、 Noise standard range

　　General standard: The noise standards for amorphous alloy transformers usually vary depending on their capacity. For amorphous alloy transformers with a capacity of 2500 kVA and below, the sound level limit should generally not exceed 65dB. This standard is determined based on market and user feedback, aiming to ensure that the noise generated by the transformer during operation does not have a significant impact on the surrounding environment.

　　Special standards: For larger capacity amorphous alloy transformers, the noise standards may be more stringent, and the specific values need to be determined based on discussions between the manufacturer and the user.

　　2、 Reasons for noise generation

　　Magnetostriction effect: The noise of amorphous alloy transformers mainly comes from the magnetostriction effect of the iron core under alternating magnetic flux. Due to the fact that the magnetostriction degree of amorphous alloy materials is about 10% higher than that of silicon steel sheets, the noise of amorphous alloy transformers is usually 6-8 dB higher than that of silicon steel sheet transformers.

　　Structural design: The structural design of amorphous alloy transformers can also affect their noise level. For example, the suspension method of the iron core, clamping structure, oil tank structure, etc. can all affect the vibration and noise of the transformer.

　　3、 Noise control measures

　　Optimizing magnetic flux density: The saturation limit of magnetic flux density for amorphous alloy transformers is about 1.5T, while silicon steel is 0.5T higher than amorphous. To reduce noise, it is necessary to ensure that the magnetic flux density of amorphous alloy transformers is lower in working conditions, generally not exceeding 1.25T. This can be achieved by increasing the cross-sectional area of amorphous alloy transformers and reducing the quality of the iron core.

　　Improved structural design: By improving the clamp structure, oil tank structure, and other measures, the vibration and noise of the transformer can be reduced. For example, placing silicone rubber pad and foam pad under the iron core, and binding the position with large amplitude of the iron core with insulating binding tape can significantly reduce the noise of the iron core.

　　Adopting noise reduction technology: increasing the support stiffness and surface at the bottom of the transformer, adding reinforcement bars to the upper frame, processing T-shaped steel in the upper frame and filling it with mud and sand can all increase damping, convert vibration kinetic energy into internal energy, and achieve the purpose of noise reduction.

　　4、 Actual cases and data support

　　Research case: A researcher tested the amorphous alloy iron core through the vibration test platform, and found that the core noise was significantly reduced when the silicon rubber pad and foam pad were placed under the iron core and the large amplitude position of the iron core was bound with insulating binding tape. During the noise testing process, the background noise was 32dB, but after taking noise reduction measures, the noise of the iron core was reduced by at least 10dB.

　　Market feedback: According to market and user feedback, the sound level limit for amorphous alloy transformers with a capacity of 2500 kVA or less shall not exceed 65dB. This standard has been widely recognized and applied in practical applications.