电动机?；ざ下菲骱腿燃痰缙鞯耐芽鄣燃妒侵甘裁?/title> <meta content="脱扣等级" name="keywords" /> <meta content="脱扣等级代表过载继电器或电动机?；ざ下菲髟?.2倍整定电流下脱扣时间范围，数字越小代表动作时间越短，常规为10A或10级；脱扣等级数字后带“E”表明其具有更严格的允差(公差带E)，脱扣时间范围更窄，通常适用于电子式过载继电器或电子式脱扣器的电动机?；ざ下菲?；脱扣等级的现实意义是为了避免电动机起动过程中热继电器或电动机?；ざ下菲魑蠖鳎蠊丶痰缙骰虻缍ǘ下菲髟谄鸲缌飨碌亩魇奔浯笥诘缍鸲奔?；脱扣等级是电动机?；ざ下菲饔肱涞绫；ざ下菲鞯闹饕鹬? name="description" /> <link href="/templates/main/css/style.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" charset="utf-8" src="/scripts/jquery/jquery-1.11.2.min.js"></script> <script type="text/javascript" charset="utf-8" src="/templates/main/js/common.js"></script> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body> <h1><a href="http://www.jczxnmz.cn/">在附近约个炮-100元不限次数上门电话,500元4个小时初中生,约附近学生50一次</a></h1><div id="xppbh" class="pl_css_ganrao" style="display: none;"><thead id="xppbh"><form 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</div> </div> <div id="pd5bzdb" class="section clearfix">  <div id="pd5bzdb" class="show_page_content"> <div id="pd5bzdb" class="news_list_page"> <div id="pd5bzdb" class="meta"> <h1>电动机?；ざ下菲骱腿燃痰缙鞯耐芽鄣燃妒侵甘裁?/h1> <p class="meta-info"> <span id="pd5bzdb" class="time">2023/8/27 1:49:03</span> <span id="pd5bzdb" class="comm"><script type="text/javascript" src="/tools/submit_ajax.ashx?action=view_comment_count&id=5073"></script>人评论</span> <span id="pd5bzdb" class="view"><script type="text/javascript" src="/tools/submit_ajax.ashx?action=view_article_click&id=5073&click=1"></script>次浏览</span> 分类：电工基础文章地址：<a href="http://www.jczxnmz.cn/tech/5073.html" target="_blank">http://www.jczxnmz.cn/tech/5073.html</a> </p> </div> <div id="pd5bzdb" class="entry"> <p> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;">电动机保护断路器和热继电器的“脱扣等级”是指什么?回答问题之前先随<a href="http://www.jczxnmz.cn/product/list_78.html" target="_blank"><span style="color:#337FE5;">电力仪表</span></a>来看两张图：</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 第一张是NSX250-Miclogic 2.2M电动机?；ば退芸嵌下菲鞯拿姘?，上面有一块整定区域Class，对应5、10和20三档。<br /> </span> </p> <p> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><img width="500" height="204" title="NSX250-Miclogic 2.2M电动机?；ば退芸嵌下菲鞯拿姘? align="" alt="NSX250-Miclogic 2.2M电动机?；ば退芸嵌下菲鞯拿姘? src="/upload/202308/27/202308270127562764.png" /><br /> <br /> 第2张是LR9G225电子式过载继电器的面板，同样有一块整定区域Class，对应有5、10、20、30四档。<br /> </span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><img width="500" height="174" title="LR9G225电子式过载继电器的面板" align="" alt="LR9G225电子式过载继电器的面板" src="/upload/202308/27/202308270128441357.png" /><br /> <br /> 那么这些数字背后的含义是什么呢？会对应什么的应用场景？昌晖仪表接下来逐一回答这些问题。</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 我们知道电动机直接起动时，会有类似如下图所示的时间-电流曲线，总共三个阶段：起动瞬间、起动阶段和运行阶段。</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 电动机起动瞬间的冲击电流一般为电动机额定电流的13~14倍，持续时间大概10ms左右，它决定了断路器磁脱扣电流值或瞬时?；ふㄖ档拇笮　Ｈ绻ㄖ堤∪菀椎贾缕鸲布涠下菲魑蠖?磁脱扣或瞬时?；ざ?。<br /> </span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><img width="500" height="268" title="电动机起动瞬间的冲击电流一般为电动机额定电流的13~14倍" align="" alt="电动机起动瞬间的冲击电流一般为电动机额定电流的13~14倍" src="/upload/202308/27/202308270130538772.png" /><br /> <br /> 电动机起动阶段的起动电流一般为电动机额定电流的4.8~8倍，起动时间取决于负载转矩、整个传达系统的转动惯性和加速转矩，说白了起动时间与负载的“轻重”有关。</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 在《工业与民用配电设计手册》第四版中，我国通常以起动时间4s和8s为分界点，划分为三档，分别称为轻载起动、一般负载起动和重载起动。</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 由于电动机在起动过程中有上述的起动电流和起动时间，所以我们选择的热继电器或者电动机?；ざ下菲?，其反时限保护脱扣特性要避免在电动机起动过程中误动作，通俗地讲，就是要躲过电动机起动电流下的起动时间。</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 于是，在热继电器产品标准GB/T14048.4-2020 第4-1部分：接触器和电动机起动器(含电动机?；て?中，热继电器的?；ぬ匦猿斯娑?.05/1.2/1.5倍整定电流下的动作特性外，还规定了7.2倍整定电流下的动作特性(见表3)。<br /> </span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><img width="534" height="337" title="热继电器的?；ぬ匦? align="" alt="热继电器的?；ぬ匦? src="/upload/202308/27/202308270136294808.png" /><br /> <br /> 7.2倍整定电流下对应不同的动作时间范围，就对应不同的脱扣等级(见表2)。例如以常见的10A级为例，其动作时间范围2~10秒，即过载继电器在7.2倍整定电流下的动作时间在2~10秒之内。</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 如果是宣称更严格的公差带E，比如电子式过载继电器LR9G，20级对应的时间范围10~20秒，比常规的20级对应的6~20秒，时间范围更窄。<br /> </span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><img width="679" height="503" title="过载继电器的脱口级别" align="" alt="过载继电器的脱口级别" src="/upload/202308/27/202308270140320066.png" /><br /> <br /> 电动机保护断路器的过载?；ぬ匦?，与热继电器完全一样，都需要遵循GB/T14048.4标准的表3，而不再是GB14048.2标准，所以电动机保护断路器同样有“脱扣等级”。脱扣等级是电动机?；ざ下菲骱团涞绫；ざ下菲鞯闹饕鹬?。</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 通常情况下，脱扣等级为10A或10级的热继电器或者电动机?；ざ下菲髂苈愕缍钠鸲枰?，只有起动时间很长的电动机，才需要考虑20级以上的脱扣等级。<br /> <br /> <img width="360" height="298" title="断路器脱扣等级" align="" alt="断路器脱扣等级" src="/upload/202308/27/202308270142433035.png" /><br /> </span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;">总结</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;">1、脱扣等级代表过载继电器或电动机?；ざ下菲髟?.2倍整定电流下脱扣时间范围，数字越小代表动作时间越短，常规为10A或10级；</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 2、脱扣等级数字后带“E”表明其具有更严格的允差(公差带E)，脱扣时间范围更窄，通常适用于电子式过载继电器或电子式脱扣器的电动机?；ざ下菲?；</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 3、脱扣等级的现实意义是为了避免电动机起动过程中热继电器或电动机?；ざ下菲魑蠖鳎蠊丶痰缙骰虻缍ǘ下菲髟谄鸲缌飨碌亩魇奔浯笥诘缍鸲奔?；</span><br /> <span style="color:#000000;line-height:2;font-family:Microsoft YaHei;font-size:16px;"><br /> 4、脱扣等级是电动机?；ざ下菲饔肱涞绫；ざ下菲鞯闹饕鹬弧?br /> <br /> 作者：宾绍平</span> </p> </div>  <div id="pd5bzdb" class="next-prev-single"> <p class="prev">上一篇：<a href="http://www.jczxnmz.cn/tech/5069.html">低压配电线路的过负荷电流指断路器额定电流还是过载?；ふǖ缌?/a></p> <p class="next">下一篇：<a href="http://www.jczxnmz.cn/tech/5075.html">充电桩的接触器如何选型</a></p> </div>  <div id="pd5bzdb" class="line10"></div> <div id="pd5bzdb" class="other_menu"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="22%" height="40" align="center" valign="middle" bgcolor="de432e"><a href="tencent://message/?uin=441910844&Site=http://www.jczxnmz.cn&Menu=yes" target="_blank" rel="nofollow">与在线工程师QQ交流</a></td> <td align="center" valign="middle"> </td> <td width="23%" 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