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'不同线圈电压的接触器、继电器的互换与代用'

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'2019-02-06 10:14:03'

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'<p>在各类空压机电路及其他主动把持电路中，接触器、继电器利用较多，故障及破坏也较多。</p><p>在检验中急需调换新的时，去去会遇到220V 与380V 两种规格的 接触器、继电器互换代用的问题。</p><p>对此，假如对详细电路不作详细剖析， 而盲目地直接代用，去去会造成把持电路事情的掉常。下述两例就是如斯。</p><p>(1) 原把持线路的实线所示，中间继电器KA 和主交换接触器KM 均为380V。</p><p style="text-align: center;"><img alt="空压机继电器" src="2018/1228/1305.jpg" /></p><p>当KM 破坏时，以220V 规格的交换接触器取代。若此时仅仅简朴地将ab 处断开，b 处接中性线N,成果将会使电路起动后无法休止事情。</p><p>由于按下SSTP 时，KA、KM均应掉电开释，可是在SSTP 断开刹时，KA与KM经由过程 KA 的动合触点立刻串接于L2 相与N 之间，因为KA 线圈的交换阻抗年夜于KM 的 线圈阻抗，KA 两头电压现实靠近220V,尚能维持其吸合状况。</p><p>是以，只要SSTP一松手，KM 又会自行吸合。显然受KM 把持的负载将无法休止事情。</p><p>(2) 某电暖装配须要暖元件通电加暖后，按必定距离时光接通或断开风寒 却电念头。</p><p>原把持电压为220V，当把持电暖装配的主接触器KM1改用380V规格时，将ab处断开，a处接L2 相，成果将泛起SST未按下(装配尚未加暖)，由KM2 把持的风寒却电机就会自行滚动一休止一滚动......</p><p>缘故原由是由于空压机继电器KT1阻抗弘远于KM1,L2 相与中性线N 之间的220V 电压险些全体落在KT1两头，使KT1吸合，其动合触点延时必定时 间闭合，接通KT2 与KM2，由KM2 把持的风寒空压机滚动起来。</p><p>KT2 的动断触点延时必定的时光后断开，使KT1掉电开释，KT1动合触点瞬时断开，堵截KT2 和KM2，同时KT2 的动断触点复位，又使KT1得电反复上述动作。</p><p>由上述两例事实阐明线圈电压不同，而混用于统一电路时必需持稳重立场。 为了避免互换代用时影响原电路事情，应遵照以下原则:</p><p>(1) 凡代用接触器、继电器与若干触点自成自力支路跨接于两相(或相零) 之间，可以直接互换代用。</p><p>(2)假如代用继电器、接触器支路在原电路与若干线圈支路并列时则:</p><p>①.互换支路中串有动合触点时，动合触点KA，还须要把动合触点的另一端(cd 处)断开改接(L1)，使其与动合触点自成自力支路;</p><p>②.互换支路中仅有动断触点时，则应详细剖析电路。</p><p>假如应先动作的继电器、接触器在互换代用后会产生误动作，即自己不先动作或不动作。</p><p>应将其动合触点串进并联支路中，因KM1在 KT1前动作，只要将KM1的一个辅助动合触点串人KT1支路中即可。</p><p>若互换代用的继电器、接触器在互换后仍会先动作而无误动作的可能，则不必如斯。</p>'

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