BP8Y-103/7103频敏变阻器(1组)
BP8Y-103/7103频敏变阻器适用于容量自1.5kw到200千瓦,交流50赫芝YZR系列起重冶金用三相异步频繁操作情况下的起动及反接设备。该异步电动机的转子回路中接入变阻器,一般采用常接方式,不需另装接触器等短接设备依据操作的频繁程度不同,可分为三类:
类:稍频繁,每小时100-400次,机械车间的桥式吊车上除主钩外,平移机钩上的电机,出米辊道,拉钢机等,大多数刚起动就断电。
***类:较频繁,每小时400-600次。冶金轧钢四间桥式吊车,除主钩外,平移机钩上的电机,轧机前后工作辊道,延伸辊道等,大多数刚起动就断电。
第三类:频繁操作,第小时600-1000次,升降后,升降台辊道,压下装置,拔钢机,轧机中辊.
变阻器实质上是一种无触点电磁元件,相当于一个等值阻抗,在电动机起动过程中,由于等值阻抗,随转子电流频率减小而自动下降,从而只需一级变阻器就可把电动机平稳的起动起来。 变阻器实质是一个铁芯,损耗特大的三相电抗器。它由数片山形钢板叠合而成,每块钢板之间有气隙垫片的铁芯及线圈两个主要部分组成。铁芯采用了冷冲制成的山字型结构.
BP8Y频敏变阻器
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