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    <td height="30" align="center"><font style="font-size:15px; font-weight:bold;">保险丝管的选用方法</font></td>
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    <td class="txt"><p style="margin: 0pt;"><span style="color: rgb(0, 0, 0); letter-spacing: 0pt; font-family: PMingLiU; font-size: 24px; font-style: normal; font-variant: normal; font-weight: normal;">保险丝管的选用可依以下流程：</span></p><p><img title="1559024981831374.jpg" alt="00.jpg" src="/upload_files/2019-05/1559024981831374.jpg"/></p><p style="margin: 0px 0px 2px; text-align: justify; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="color: rgb(107, 51, 31); letter-spacing: 0px; font-family: 宋体,SimSun; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">需考虑因素</span></p><p style="text-align: justify; line-height: 25px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">1、</span> <span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU; font-size: 20px;">设计时电路中空间的限制。根据整机所需的安全认证决定</span> <span style="font-family: PMingLiU; font-size: 20px;">保险丝管的安全认证，在此保险丝管可初步决定为</span></span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">IEC</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU; font-size: 20px;">规格或</span> </span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">UL</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">规格。</span></span></p><p style="text-align: justify; line-height: 28px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><span style="color: rgb(107, 51, 31); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">2、</span> <span style="color: rgb(107, 51, 31); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">安装方式</span><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU; font-size: 20px;">额定电压应大于等于有效的电路电压，分断能</span> <span style="font-family: PMingLiU; font-size: 20px;">力应大于电路中的最大故障电流。整机开关时电路中是否存</span> <span style="font-family: PMingLiU; font-size: 20px;">在起动电流，起动电流在某些电路中是正常的，这种场合应</span> <span style="font-family: PMingLiU; font-size: 20px;">使用延时型和中等延时型保险丝管。保险丝管必须切断的电</span> <span style="font-family: PMingLiU; font-size: 20px;">流及持续时间（该条件由设计人员依具体电路的保护需求而</span> <span style="font-family: PMingLiU; font-size: 20px;">定）。参考相应型号的</span></span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">I</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">-</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">T</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU; font-size: 20px;">曲线，取满足要求的最大额定电流</span> <span style="font-family: PMingLiU; font-size: 20px;">作为上限值</span></span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">1。</span></span></p><p style="margin: 0px 0px 1em; text-align: justify; line-height: 15px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">通过保险丝管的稳定电流（依具体电路而定）。</span></span></p><p style="margin: 0px 0px 1em; text-align: justify; line-height: 15px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">B</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-style: normal; font-variant: normal; font-weight: bold;">IEC</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-style: normal; font-variant: normal; font-weight: normal;">规格及</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-style: normal; font-variant: normal; font-weight: bold;">UL</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-style: normal; font-variant: normal; font-weight: normal;">规格保险丝的额定电流的差别，</span></span></span></p><p style="text-align: justify; line-height: 15px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">C</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">环境温度对保险丝管承载能力的影响。</span></span></p><p style="text-align: justify; line-height: 32px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">D</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">脉冲（冲击电流，浪涌电流，起动电流及电流瞬变值）</span></span></p><p style="text-align: justify; line-height: 32px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">E</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="font-family: 宋体,SimSun; font-size: 20px;"><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">起动电流及_时间与相应型号的</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">I</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">-</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">lffl</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">线比较。综合考 虑以上五个因素后，选出满足要求的最小额定电流作为下限 </span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">2.综合考虑以上因素后，选出最合适的型号及额定电流》 当</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">1&gt;</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">2时，则选额定电流为</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">2的相应型号保险丝管。当 </span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">1</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">SA</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">2时，则选额定电流为</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: 宋体,SimSun; font-style: normal; font-variant: normal; font-weight: normal;">1的相应型号保险丝管。</span></span></span></p><p style="margin: 0px 0px 2px; text-align: justify; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><span style="color: rgb(107, 51, 31); letter-spacing: 0px; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">稳态电流</span><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">在实际应用中和实验室之间有不同的条件如：</span></span></p><p style="text-align: justify; line-height: 26px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">A</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">有时使用保险丝盒；</span></span></p><p style="text-align: justify; line-height: 26px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">B</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">电路中的电线横截面积；</span></span></p><p style="text-align: justify; line-height: 35px; text-indent: 0px; -ms-text-justify: inter-ideograph;"><span style="font-family: 宋体,SimSun; font-size: 20px;"><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">C</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;">、</span> <span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU; font-size: 20px;">保险丝管夹的接触电阻等，考虑到以上因素，故在</span>25°</span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">C</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU; font-size: 20px;">条件</span> <span style="font-family: PMingLiU; font-size: 20px;">下所选用的保险丝管应满足如下条件才可使得保险丝管持续可</span> <span style="font-family: PMingLiU; font-size: 20px;">靠地工作：</span></span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: bold;">IEC</span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU; font-size: 20px;">规格：保险丝管的额定电流In</span><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-size: 20px; font-style: normal; font-variant: normal; font-weight: normal;">=稳态电流<span style="font-family: 宋体,SimSun; font-size: 20px;"><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-style: normal; font-variant: normal; font-weight: normal;">/0.9&nbsp;&nbsp;&nbsp;&nbsp; </span><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-style: normal; font-variant: normal; font-weight: bold;">UL</span></strong><strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: Arial; font-style: normal; font-variant: normal; font-weight: bold;"></span></strong><span style="color: rgb(0, 0, 0); letter-spacing: 0px; font-family: PMingLiU; font-style: normal; font-variant: normal; font-weight: normal;"><span style="font-family: PMingLiU;">规格：保险丝管的额定电流比</span>=稳态电流/0.75。</span></span></span></span></span></p><p>&nbsp;</p></td>
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