嘉峪关干式变压器：嘉峪关干式变压器的噪声

嘉峪关干式变压器的噪声 　　
声音的基本概念
嘉峪关干式变压器在运行中产生绵密的声音，它主要是硅钢片在磁场作用下产生的磁致伸缩和器身由于电磁力所引起的振动结果。
声音由弹性介质的周期振动而产生，当振动频率在16—2000Hz之间可引起人们的听觉。低于16Hz称次声.高于2000Hz称为超声、次声和超声人们的听觉都感受不到。
声音的三个特性是音调、响度和音品。音调高低决定于频率的高低，响度为声音强弱，声源振幅越大.声音强度越大，响度单位为口方，其值用声强来衡量，即每秒通过垂直声波传播方向单位面积Cm²的能量，单位为尔格/cm²。
声音从声品角度分为乐音和噪音，乐音是由周期性振动的.人们听到后能产生舒适感。噪声是许多发声的组合，它的波形是无规律的非周期性曲线，人听到不舒服。通常声音中可能包括乐音和噪音两种成分。
人们能听到声强为10-8—10-3W/cm²声强与频率、振幅的平方成正比，其变化范围较大。
声音的倾率与其音调、声强和响度有关，当然也就与听觉范围直接相联系。
声音是以波的形式均匀地向各方向传播.故声音具有波动的特性.即有反射、折射.干涉、驻波和共振等现象。
嘉峪关干式变压器噪声的传播是由铁心到夹件、绕组.同时也由铁心到空气。产音的传播过程可使传播介质有疏密变化，也即有声强和声压的变化，
应该指出.嗓声水平不是用算术加减的，当嗓声的声源功率增加一倍或由一个声源变成两个声源时，则声强将增加一倍.声压增加根号3倍，而噪声水平只增加101g2=3dB。
嘉峪关干式变压器大部分安装于户内.其噪声通常均低于油浸式嘉峪关干式变压器。由于嗓声对环境是一种污染和现代社会的公害.因而公共场所对噪声水平要求较高。

Transformer noise

The basic concepts of sound
The dry type power transformers in operation to produce a dense sound, it is mainly the results of the vibration caused by the magnetostriction and the body of the silicon steel sheet produced in the magnetic field due to electromagnetic force.
The sound generated by the periodic vibration of the elastic medium, when the vibration frequency between 16-2000Hz can cause people's hearing. Below 16Hz, said infrasound. Above 2000Hz known as ultrasound, infrasound and ultrasound hearing of people with no sense.
Three characteristics of the voice pitch, loudness and timbre. Pitch is determined by the level of frequency and loudness for the strength of sound, the amplitude of the sound source the greater the greater the intensity of the sound, the loudness unit for the port side, and its value to measure the sound intensity per second through a vertical acoustic wave propagation direction unit area of ??Cm, ² energy, in units of erg / cm ².
The voice from the perspective of sound products into the music and noise music by periodic vibration. People hear a comfort. Noise is a combination of voice, its waveform is irregular aperiodic curve, people hear uncomfortable. Usually sound, including music and noise of two components.
People can hear the sound intensity 10-8-10-3W/cm ² sound intensity and frequency, amplitude is proportional to the square of its range.
Dumping rate and its tone of the sound, sound intensity and loudness is related, of course, directly linked with the hearing range.
The sound is the form of waves in all directions evenly spread. Therefore, the characteristics of the sound fluctuations that reflection, refraction, interference, standing waves and resonance phenomena.
The dry-type power transformer noise transmission to the folder from the core, winding from the core into the air. Production sound propagation process allows propagation medium density changes, ie changes in sound intensity and sound pressure,
It should be noted that the level of the voice sound is not arithmetical addition and subtraction, when the sound source of the voice sound power doubling or by a sound source into two sources, keep still forced to doubling the sound pressure to increase the square root of 3 times the noise level increased by only 101g2 = 3dB.
Most of the dry type power transformers installed in the indoor and the noise is usually below the oil-immersed transformer. As the voice sound kind of pollution and nuisance of modern society on the environment. Thus in public places require a higher noise level.

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