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	 油浸式    变压器    可有自冷式、风冷式、强油风冷或水冷式冷却方式可供选择。 
 
 
	  
 
 
 
	 随着低损耗技术的发" />
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                        <b>油浸式变压器冷却方式选择</b>
                        <p>
                            <span><i></i>发布时间：2023/7/25 9:40:20</span>
                            <span><i></i>浏览：400</span>
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                      <p> <p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">油浸式</span><span><span style="background-color:#FFFFFF;font-size:12pt;"><a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a></span></span><span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">可有自冷式、风冷式、强油风冷或水冷式冷却方式可供选择。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">随着低损耗技术的发展，采用油浸、自冷式冷却的容量上限制在增加，40000kVA及以下额定容量的</span><span><span style="background-color:#FFFFFF;font-size:12pt;">变压器</span></span><span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">可选用油浸自冷冷却方式。优点是不要辅助供风扇用的电源，没有风扇所产生的噪声，散热器可直接持在变压器油箱上，也可集中装在变压器附近，油浸自冷式变压器的维护简单，始终可在额定容量下运行。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">如选用可膨胀式散热器，<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>可不装储油柜并可设计成全密封型，维护量更少了，一般可在2500kV及以下配电变压器上采用。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>风冷式散热器是利用风扇改变进入散热器与流出散热器的油温差，提高散热器的冷却效率，使散热器数量减少，占地面积缩小。8000kVA以上容量的变压器可选用风冷冷却方式。但此时要引入风扇的噪声，风扇的辅助电源。停开风扇时可按自冷方式运行，但是输出容量要减少，要降低到三分之二的额定容量。对管式散热器而言，每个散热器上可装两个风扇，对片式散热器而言，可用大容量风机集中吹风，或一个风扇吹几组散热器。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">强油风冷式水冷是采用带有潜油泵与风扇的风冷却器或带有潜油泵的水冷却器。一般用于50000kVA及以上额定容量的<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>。强油风冷冷却器可持在油箱上或单独安装。根据国内习惯，一般在变压器上多供一台备用冷却器。这是供有一台冷却器有故障需维修时使用。由于不是额定容量下运行时，变压器可停运一部分冷却器，对停用冷却器而言，潜油泵不能倒转，因此，每台冷却器上应有逆止阀，使油只能沿一个方向流动。</span><br />
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">对强油冷却方式应注意几个问题：</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">(1)油泵与风扇失去供电电源时，变压器就不能运行，即使空载也不能运行。因此应有两个独立电源供冷却器使用。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">(2)潜油泵不能有定子与转子扫膛现象，金属异物进入绕组会引起击穿事故。</span><br />
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">油路设计时不能使潜油泵产生负压，有负压时勿吸入空气，影响绝缘会引起击穿事故。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">(3)强油冷却的油面温升较低，不能以油面温度来判断绕组温升。尤其强油水冷，绕组温升接近规定限值时，油面温升很低。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">(4)超高压<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>采用强油冷却时还应防止油流放电现象。在绕组内油路设计时，应防止油的紊流，限制油流速度，选用合适电阻率的油，绝缘件表面要光滑，铁心上应有足够体积使油释放电荷。防止油流带电发展到油流放电。在启动冷却器时可逐个启动到应投入的冷却器数。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">(5)选用大容量冷却器时应注意油流不能短路，要使冷却后的油能进入绕组</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">(6)选用水冷却器时应注意冷却水的水质，冷却水内有杂质，易堵住冷却器而影响散热面。水压不能大于油压。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;">(7)强油风冷<a href="http://www.krbyq.com/ProductCenter.html" target="_blank">变压器</a>外有隔墙时，隔墙应离冷却器3m以上，以免干扰空气自由运动。</span>
</p>
<p>
	<span style="font-family:宋体;background-color:#FFFFFF;font-size:12pt;"><br />
</span>
</p>
<p style="text-indent:2em;">
	<span yes";mso-hansi-font-family:verdana;mso-bidi-font-family:宋体;mso-font-kerning:0.0000pt;"="" style="margin: 0px; padding: 0px; white-space: normal; background-color: rgb(255, 255, 255); letter-spacing: 0.75pt; font-family: 楷体_GB2312; font-size: 12pt;"><span style="font-family:宋体;">选用散热器或强油风冷冷却方式，此时，停泵时可按80%额定容量运行，停泵与停风扇时可按60%额定容量运行，但安装面积要足够</span></span>
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