开封干式变压器：开封干式变压器降低嗓声的措施和噪声测量

开封干式变压器降低嗓声的措施和噪声测量 　　
(1)降低噪声的措施
减少铁心硅钢片磁致伸缩，降低磁通密度是降低噪声的有效措施，但降低磁密又会导致铁心尺寸增大，从而增加铁心硅钢片的数量，进而增加了嗓声的辐射表面积.这样势必造成开封干式变压器制造成本增加，因此通过降低磁密以降低嗓声水平的措施受到了一定限制。
当开封干式变压器铁心磁密在1.5&mdas电 话：0635-8888299h;1.55T范围时，磁密每变化0.1T，嗓声变化2—3dB，设计时应考虑磁密变化与铁心质量变化关系.这也就是干变成本变化的关系。
为降低噪声，也可从结构与工艺上采取措施而加以解决。对于树脂绝缘开封干式变压器设计时，在适当位置加缓冲件，如在铁心和低压绕组间加以橡胶适形撑块，其作用一方面撑紧低压绕组.另一方面起到缓冲作用。因为铁心产生的噪声是通过铁心与低压绕组间的空隙.高低压绕组间空隙及高压绕组表面传播，以及通过铁心下端传播出去.所以在铁心垫脚上加橡胶垫等也是使声音通过缓冲结构而得到衰减，加缓冲措施后可使嗓声水平下降，但只在结构上采取措施不能达到大幅度降低噪声水平的效果。
(2)噪声测量
为了检验开封干式变压器的嗓声水平需进行噪声测量。因为环境噪声将影响测量结果.因此测量不应在生产车间内进行。一般在产品安装后测量。测量时.在开封干式变压器周围放置了若干测音器.以测量其平均值表示开封干式变压器的平均嗓声水平，这时噪声的辐射表面即开封干式变压器基准轮廓线，基准轮廓线到外围(测量)轮脚线距离不小于1m，开封干式变压器大部分属于配电开封干式变压器范围，要求在主要辐射面上安装2-3个测音器。

Transformer to reduce the throat sound
(1) measures to reduce noise
Reduce the magnetostriction of the core silicon steel to reduce magnetic flux density is an effective measure to reduce noise, but to reduce the flux density will lead to the core size increases, thereby increasing the number of silicon steel core, thus increasing the radiation surface area of the throat sound. This is bound to the dry type power transformer manufacturing costs, by reducing the flux density in order to reduce the level of the voice sound of the measures has been limited.
When dry-type power transformer core flux density in the 1.5-1.55T range, flux density changes 0.1T, my voice changes 2-3dB, the design should take into account changes in the flux density with the core quality changes. This is dried to become the changes in the relationship.
To reduce noise, can also be taken from the structure and process measures to solve them. Resin dry-type power transformers in place plus buffer between the core and low-voltage winding to be rubber conformal support block, and its role on the one hand to hold tight and low-voltage winding. On the other hand play a buffer role. Because 华盈非晶合金变压器有限公司the core noise generated by the gap between the core and low-voltage winding surface spread between high and low voltage winding gaps and the high voltage winding, and spread out through the core the bottom pad feet plus rubber pad in the core is also the voice through the buffer structure attenuation, plus buffer measures can make a voice sound levels, but only to take measu联系人：陈经理res in the structure can not achieve a significant reduction in the effect of noise levels.
(2) noise measurement
In order to test the level of the voice sound of the dry type power transformers, the need for noise measurement. Because of environmental noise will affect the measurement results. Measurement should not be used in the production workshop. General measurement of the product installation. Measurements. A number of sound measuring device placed around the transformer to measure the level of the average voice sound its mean value of the transformer, when the noise radiation surface transformer benchmark contour, the reference contour to the periphery (measurement) round the foot from the line not less than 1m, dry type power transformers are distribution transformers range, requiring installation on the main radiating 2-3 measured tone.

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