金昌干式变压器：金昌干式变压器的噪声_1

金昌干式变压器的噪声 　　
1.声学的若干基本概念
声音是由弹性介质的周期性振动产生的，振动频率在16—20000Hz之间，能引起人们的听觉。低于16Hz的叫次声，高于20000Hz的叫超声.。人的听觉感受不到次声和超声。
声音有三个特性，即音调、响度和音品。音调的高低决定于频率的高低。响度就是声音的强弱，声像的振幅越大，声音的响度也越大.响度的单位为昉。响度可用声强来衡量，即每秒钟通过垂直于声波传播方向1cm²面积的能量，其单位澳W /cm²。
2.金昌干式变压器降低嗓声的措施
金昌干式变压器噪声来源于金昌干式变压器本休和冷却系统两个方面，本体噪声主要由铁心硅钢片磁致伸缩所引起的振动，通过铁心垫脚和金昌干式变压器油传递给箱体和附件而产生;冷却系统的嗓声主要由风扇和油泵的振动引起。金昌干式变压器铁心嗓声的频谱范围在100-50OHz之间。

Dry-type transformer noise

1 Some basic concepts of acoustics
Sound is vibration periodic elastic medium, the vibration frequency between 16-20000Hz, can cause people's hearing. Below 16Hz is called infrasound, higher than 20000Hz is called ultrasound. Hearing people do not feel the infrasound and ultrasound.
There are three characteristics of sound, that pitch, loudness and timbre. The level depends on the frequency of the tone level. Loudness is the strength of the sound, audio-visual amplitude greater, the greater the loudness of sound. Loudness of the unit is Fang. Loudness can be used to measure sound intensity, that is perpendicular to the second sound wave propagation direction by 1cm ² area of energy, the unit O W / cm ².
2 dry-type transformers sound measures to reduce the throat
Transformer noise from the transformer and cooling system of the two off, the body mainly by the noise caused by magnetostriction of silicon steel core vibration by core pad feet and passed to the transformer oil tank and accessories and produces; the voice sound of the main cooling system by the vibration of the fan and pump. Power transformer core voice sound spectrum in the range between 100-50OHz.

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