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                        <b>变压器基础知识</b>
                        <p>
                            <span><i></i>发布时间：2023/7/1 9:24:23</span>
                            <span><i></i>浏览：356</span>
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                      <p> <div style="margin:0px 0px 10px;padding:0px;font-size:14px;background-color:#FFFFFF;border:0px;font-family:Verdana, " vertical-align:baseline;color:#303030;"="">
<h1 style="font-size:26px;color:#333333;font-style:inherit;font-family:inherit;vertical-align:baseline;">
	<span style="font-size:14px;color:#000000;"><span></span><a href="http://www.krbyq.com/ProductCenter.html" target="_blank"><span></span>变压器<span></span></a><span></span></span><span style="font-size:14px;color:#000000;">入门基础知识大全</span> 
</h1>
	</div>
<div style="margin:0px;padding:0px;font-size:14px;background-color:#FFFFFF;border:0px;font-family:Verdana, " vertical-align:baseline;color:#303030;"="">
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;"><a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a></span><span style="font-size:14px;color:#000000;">(</span><span style="color:#000000;font-family:inherit;font-size:14px;"><span style="font-style:inherit;line-height:inherit;font-size:14px;color:#000000;"><b>Transformer</b></span></span><span style="font-size:14px;color:#000000;">)是利用电磁感应的原理来改变交流电压的装置，主要构件是初级线圈、次级线圈和铁芯(磁芯)。主要功能有：电压变换、电流变换、阻抗变换、隔离、稳压(磁饱和变压器)等。按用途可以分为：电力变压器和特殊变压器(电炉变、整流变、工频试验变压器、调压器、矿用变、音频变压器、中频变压器、高频变压器、冲击变压器、仪用变压器、电子变压器、电抗器、互感器等)。电路符号常用T当作编号的开头.例:T01,</span><span style="color:#000000;font-family:inherit;font-size:14px;"><span style="font-style:inherit;line-height:inherit;font-size:14px;color:#000000;"><b>T201</b></span></span><span style="font-size:14px;color:#000000;">等。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;"><a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>参数</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">工作频率</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;"><a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>铁芯损耗与频率关系很大，故应根据使用频率来设计和使用，这种频率称工作频率。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">额定功率</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">在规定的频率和电压下，变压器能长期工作而不超过规定温升的输出功率。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">额定电压</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">指在<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>的线圈上所允许施加的电压，工作时不得大于规定值。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">电压比</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">指<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>初级电压和次级电压的比值，有空载电压比和负载电压比的区别。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">空载电流</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">变压器次级开路时，初级仍有一定的电流，这部分电流称为空载电流。空载电流由磁化电流(产生磁通)和铁损电流(由铁芯损耗引起)组成。对于50Hz电源变压器而言，空载电流基本上等于磁化电流。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">空载损耗</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">指<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>次级开路时，在初级测得功率损耗。主要损耗是铁芯损耗，其次是空载电流在初级线圈铜阻上产生的损耗(铜损)，这部分损耗很小。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">效率</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">指次级功率P2与初级功率P1比值的百分比。通常变压器的额定功率愈大，效率就愈高。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">绝缘电阻</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">表示<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>各线圈之间、各线圈与铁芯之间的绝缘性能。绝缘电阻的高低与所使用的绝缘材料的性能、温度高低和潮湿程度有关。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">变压器的分类</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1、按相数分：</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1)单相<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>：用于单相负荷和三相变压器组。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2)三相变压器：用于三相系统的升、降电压。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2、按冷却方式分：</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1)</span><span style="font-size:14px;color:#000000;">干式变压器</span><span style="font-size:14px;color:#000000;">：依靠空气对流进行自然冷却或增加风机冷却，多用于高层建筑、高速收费站点用电及局部照明、电子线路等小容量变压器。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2)油浸式<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>：依靠油作冷却介质、如油浸自冷、油浸风冷、油浸水冷、强迫油循环等。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">3、按用途分：</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1)电力变压器：用于输配电系统的升、降电压。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2)仪用变压器：如电压互感器、电流互感器、用于测量仪表和继电保护装置。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">3)试验<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>：能产生高压，对电气设备进行高压试验。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">4)特种变压器：如电炉变压器、整流变压器、调整变压器、电容式变压器、移相变压器等。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">4、按绕组形式分：</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1)双绕组变压器：用于连接电力系统中的两个电压等级。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2)三绕组变压器：一般用于电力系统区域变电站中，连接三个电压等级。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">3)自耦<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>：用于连接不同电压的电力系统。也可做为普通的升压或降后变压器用。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">5、按铁芯形式分：</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1)芯式变压器：用于高压的电力变压器。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2)</span><span style="font-size:14px;color:#000000;">非晶合金变压器</span><span style="font-size:14px;color:#000000;">：非晶合金铁芯变压器是用新型导磁材料，空载电流下降约80%，是节能效果较理想的配电变压器，特别适用于农村电网和发展中地区等负载率较低地方。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">3)壳式<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>：用于大电流的特殊变压器，如电炉变压器、电焊变压器;或用于电子仪器及电视、收音机等的电源变压器。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">变压器的作用</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">变压器在电器设备和无线电路中，变压器常用作升降电压、匹配阻抗，安全隔离等。在发电机中，不管是线圈运动通过磁场或磁场运动通过固定线圈，均能在线圈中感应电势，此两种情况，磁通的值均不变，但与线圈相交链的磁通数量却有变动，这是互感应的原理。变压器就是一种利用电磁互感应，变换电压，电流和阻抗的器件。变压器的最基本形式，包括两组绕有导线之线圈，并且彼此以电感方式称合一起。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;"><a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>的问题及解决方法</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1、变压器使用寿命特别短：由于劣质产品采用的是全铝和半铜半铝的绕线材料，导致变压器线圈比合格变压器的线圈使用寿命要短好多，一般劣质变压器的使用寿命只两年左右的时间。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2、变压器在额定功率内烧毁：由于劣质变压器多半采用的是铝线作材料，导致其产品在抗短路能力方面的性能特别弱，普通合格变压器至少可以承受多于额定设计20%的过载能力，而劣质变压器一旦出现过载的情况下，变压器线圈很容易烧毁。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">3、变压器损耗比铭牌上损耗参数大：大部分变压器尤其采用是的劣质或旧的硅钢片，导致其空载损耗和负载损耗比普通合格产品要大的多，无形中给客户增加了很多成本。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">变压器使用注意事项</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">1、防止变压器过载运行：长期过载运行，会引起线圈发热，使绝缘逐渐老化，造成匣间短路、相间短路或对地短路及油的分解。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">2、保证绝缘油质量：变压器绝缘油在贮存、运输或运行维护中，若油质量差或杂质、水分过多，会降低绝缘强度。当绝缘强度降低到一定值时，变压器就会短路而引起电火花、电弧或出现危险温度。因此，运行中变压器应定期化验油质，不合格的油应及时更换。把安全工程师站点加入收藏夹</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">3、防止<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>铁芯绝缘老化损坏：铁芯绝缘老化或夹紧螺栓套管损坏，使铁芯产生很大的涡流，引起铁芯长期发热造成绝缘老化。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">4、防止检修不慎破坏绝缘：变压器检修吊芯时，注意保护线圈或绝缘套管，如果发现有擦破损伤，应及时处理。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">5、保证导线接触良好：线圈内部接头接触不良，线圈之间的连接点、引至高、低压侧套管的接点、以及分接开关上各支点接触不良，会产生局部过热，破坏绝缘，发生短路或断路。此时所产生的高温电弧会使绝缘油分解，产生大量气体，变压器内压力加。当压力超过瓦斯断电器保护定值而不跳闸时，会发生爆炸。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">6、防止电击：电力变压器的电源一般通过架空线而来，而架空线很容易遭受雷击，变压器会因击穿绝缘而烧毁。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">7、短路保护要可靠：变压器线圈或负载发生短路，变压器将承受相当大的短路电流，如果保护系统失灵或保护定值过大，就有可能烧毁变压器。为此，必须安装可靠的短路保护装置。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">8、保持良好的接地：对于采用保护接零的低压系统，(考试.大)变压器低压侧中性点要直接接地当三相负载不平衡时，零线上会出现电流。当这一电流过大而接触电阻又较大时，接地点就会出现高温，引燃周围的可燃物质。</span> 
	</p>
	<p style="font-style:inherit;font-size:inherit;font-family:inherit;vertical-align:baseline;">
		<span style="font-size:14px;color:#000000;">9、防止超温：<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>运行时应监视温度的变化。如果变压器线圈导线是A级绝缘，其绝缘体以纸和棉纱为主，温度的高低对绝缘和使用寿命的影响很大，温度每升高8℃，绝缘寿命要减少50%左右。变压器在正常温度(90℃)下运行，寿命约20年;若温度升至105℃，则寿命为7年5温度升至120℃，寿命仅为两年。所以变压器运行时，一定要保持良好的通风和冷却，必要时可采取强制通风，以达到降低变压器温升的目的。</span> 
	</p>
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