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什么是发电机的自励磁?自励磁有何条件?
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什么是发电机的自励磁?自励磁有何条件?
时间:2022-01-04 23:50
关键词:
水电站
水利工程
水电自动装置检修工(综合练习)
火电电力职业技能鉴定考试
答案解析
<p> 要使发电机正常的发电,发电机转子磁极必须有一定的磁场强度。但是任何发电机或励磁机在刚启动时,磁极剩磁都很弱,因此在发电机旋转起来以后,其磁场要经过一个由弱变强的过程,才能在空载状态建立额定电压,这个过程就是自励磁过程。能够自励的条件之一是发电机转子转速要达到额定转速,而且要有一定的剩磁,条件之二是流过磁极线圈的电流必须能加强剩磁,而不是削弱它。</p>
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