IS420ESWBH1A

GE  IS420ESWBH1A

    高压电机一般功率较大，启动时对电网的冲击非常严重，直接启动、串联电抗器启动、自藕变压器降压启动、热变电阻软启动、磁控软启动、变频软启动是高压电机常见的启动方式，本文对这几种启动方式做简单的介绍。

    一、高压电机直接启动

    直接启动就是在全电压条件下直接启动电机。如果电网条件允许,可以采用直接启动。但在实际生产过程中往往由于电网容量有限,很少采用直接启动。由于采用直接启动时,启动电流大,使电压下降幅度较大,对于供电系统有较大的冲击,如果压降超过一定值,有可能导致上级变电所跳闸。故在实际运行中很少采用这种直接启动方法。

    二、高压电机串联电抗器启动

    串联电抗器启动就是在电机启动的时候串入电抗器,以限制和降低电机启动时的启动电流及电网压降,当电机运行稳定且电流达到一定值时,切除电抗器变为电机直接启动模式。由于启动过程中电机端的电压也下降,容易导致启动转矩不够,在启动过程中还会出现一个二次冲击的过程。

    三、高压电机自耦变压器启动

自耦变压器启动是指电动机启动时利用自耦变压器来降低加在电动机定子绕组上的启动电压。待电动机启动后，再使电动机与自耦变压器脱离，从而在全压下正常运行。优点是可以按容许的启动电流和所需的启动转矩来选择自耦变压器副边的不同抽头实现降压启动，而且不论电动机定子绕组采用星形接法或三角形接法都可以使用。缺点是设备的体积较大，因而成本较贵。

    四、高压电机变电阻软启动

    变电阻软启动包括热变电阻启动和液阻启动,主要通过在回路中串入可变的液态电阻来分担部分压降。随着启动时间的推移,可变电阻上的压降减少,最终使高压电机顺利启动。变电阻启动方式在启动过程中的启动特性较好,但不适宜频繁启动。

    五、高压电机磁控式软启动

    磁控式软启动是利用磁放大器原理制造的串联在电源和电动机之间的三相饱和电抗器，启动时通过数字控制板调节磁放大器控制绕组的激磁电流，改变饱和电抗器的电抗值调节启动电压降，实现电动机软启动。

    六、高压电机变频软启动

    变频软启动就是利用可控硅元件的通断作用先把工频交流电源通过整流器转换成直流电源,然后再把直流电源递变转换成频率、电压均可控制的交流电源,供给电机,来达到平稳启动的目的。现在,矩阵交交变频也在发展中。变频软启动与其他启动方式相比具有很大的优越性,随着技术的发展,是最具有发展前景的高压电机启动方式。

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OHAUS Harvard Trip Balance 2KG

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Townsen specific ion meter PH ORP

Cathodeon HPK 125 high pressure mercury vapour lamp UV spectrograph

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High Temperature Insulating Jacket Type 2 - suit plastics machinery or lab use

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