中低压柜防涡流的措施有哪些呢？

bzp4891

如题

Tricity

有一本书说得比较清楚，节选了一小部分：

Proximity effect on the enclosure
The electric field produced by the current-carrying conductors of each phase also links the metallic bus
enclosure, its mounting supports, and structures existing in the vicinity, parallel and around the axis of the current-
carrying conductors. It causes induced (parasitic) currents in such structures and leads to the following:

Resistance losses (I2R) and
Magnetic losses.

Magnetic losses will constitute the following:
Eddy current losses and
Hysteresis losses

The electrodynamic forces between the enclosure and the conductors will be small because the enclosure, which
is non-continuous, will carry much less current than the main conductors. They therefore need not be considered
separately, as the metallic structure will have sufficient strength to bear them.
In a non-magnetic enclosure, such as aluminium or stainless steel, there will be only resistance losses. In a
magnetic enclosure, such as mild steel (MS), there will also be hysteresis and eddy current losses in addition to
resistance losses. All these losses appear as heat in the enclosure and the metallic structures in the vicinity. At
higher currents say, 2000 A and above, this phenomena, particularly with MS enclosures, may assume such large
proportions that the enclosure, instead of providing aheat-dissipating surface to the heat generated by the
current-carrying conductors inside, may add to their heat.

baigonghao

通过电流的地方如果是钢板应该开槽并安装无磁不锈钢或铝板，当然还有结构等因素

bzp4891

baigonghao 发表于 2016-4-13 10:09
通过电流的地方如果是钢板应该开槽并安装无磁不锈钢或铝板，当然还有结构等因素

中压柜穿过主母线的侧板的常用设计，开槽/铝板/不锈钢板/SMC绝缘板。

bzp4891

请教，其原理是什么?
---莫非诚版以为火力、水力发电机出口---变压器之间的离相母线的外壳可以采用碳钢材料（冷板、镀锌板等等）？目前离相母线的外壳是铝合金的。

bzp4891

还有现在在配电系统中大量应用的12/24kv的气体绝缘环网柜，将负荷开关、主母线、分支母线密封在SF6气体环境中的不锈钢气箱的材料可以换成普通的碳钢（冷板、镀锌板）吗？

bzp4891

不锈钢在涡流作用下，发热比铁还严重



-------{:cry:}{:cry:}

bzp4891

如果，不锈钢能防止涡电流，你家用电磁炉，就别想用不锈钢锅了。

1.中、低压柜上防涡流的不锈钢是奥氏体不锈钢（美标牌号304不锈钢），你说的家用的那种的是铁素体不锈钢，奥氏体不锈钢弱磁，铁素体不锈钢导磁；
2.区别这两种不锈钢最好的办法就是用磁铁去吸他们，用一块磁铁吸下你家里的不锈钢锅，或到配电房气体绝缘环网柜吸一下；
3.奥氏体不锈钢比铁素体不锈钢贵；

Tricity

非导磁材料，例如不锈钢、塑料、铜、铝等材料都可以降低涡流发热，有些海外项目要求开关柜电缆孔的盖板采用铜质或不锈钢板，也是这个道理。