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变压器导磁回路中的间隙对变压器有什么影响

2025-03-16 20:49:21

推荐回答（1个）

回答1：

如果变压器铁心磁回路中出现间隙(空气隙或变压器油等非铁磁材料)，则与铁心为闭合时相比，主磁通所经过的铁心磁回路的磁导减小。根据磁路欧姆定律，磁路中的磁通大小一定时，磁导小(即磁阻大)则所需励磁磁动势大。铁心磁回路中出现间隙，会使磁路的磁导大幅减小。因此，要产生同样大小的主磁通，有间隙时所需的励磁磁动势和相应的励磁电流就比铁心闭合时的要增大很多。励磁电流大，会使变压器的功率因数降低，运行性能变差。所以，为了减小励磁电流，变压器铁心都要做成闭合的。

相关资料：http://bbs.big-bit.com/thread-464966-1-1.html

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