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接地变消弧线圈接地变压器的

网址:www.xiaohuxianquan.com.cn  2022-07-05  作者:admin    阅读:

接地变消弧线圈接地变压器的作用:
The function of ground transformer with arc suppression coil:
在系统为△型接线或Y型接线中性点无法引出时,引出中性点用于加接消弧线圈或电阻,此类变压器采用Z型接线(或称曲折型接线),与普通变压器的区别是每相线圈分别绕在两个磁柱上,这样连接的好处是零序磁通可沿磁柱流通,
When the neutral point of Delta connection or Y connection can not be drawn out, the neutral point is used to add arc suppression coil or resistance. This kind of transformer adopts Z connection (or zigzag connection). The difference between this kind of transformer and ordinary transformer is that each phase coil is wound around two magnetic poles separately. The advantage of this connection is that zero sequence flux can flow along the magnetic pole.
而普通变压器的零序磁通是沿着漏磁磁路流通,所以Z型接地变压器的零序阻抗很小(10Ω左右),而普通变压器要大得多。按规程规定,用普通变压器带消弧线圈时,其容量不得超过变压器容量的20%。而Z型变压器则可带90% ~100%容量的消弧线圈,接地变除可带消弧圈外,也可带二次负载,可代替所用变,从而节省投资费用。
The zero-sequence flux of ordinary transformer flows along the magnetic leakage circuit, so the zero-sequence impedance of Z-grounded transformer is very small (about 10), while that of ordinary transformer is much larger. According to the regulations, the capacity of ordinary transformer with arc suppression coil shall not exceed 20% of the transformer capacity. The Z-type transformer can be equipped with arc suppression coils of 90%-100% capacity, and the grounding transformer can be equipped with arc suppression coils as well as secondary loads, which can replace the used transformers, thus saving investment costs.