电流、电压的故障分量和正序 负序分量有什么联系吗?
电流、电压的故障分量和正序 负序分量有什么联系吗? 还是工频故障分量和正负序分量有联系呢? 请大神帮帮我呵呵 电流、电压的故障分量和正序 负序分量有什么联系吗? 还是工频故障分量和正负序分量有联系呢? 请大神帮帮我 ...世界足球先生 发表于 2009-12-22 14:22 https://tech.cepsc.com/images/common/back.gif
这是继保里面的问题,负序和零序分量只有在不对称故障时才出现,因此,负序和零序分量即为故障分量。但是这主要是因为对称分量变换在故障计算和保护中的广泛应用造成的,让人感觉负序和零序分量与故障分量是可以对等互换的,其实不然。如果我们不用对称分量变换,故障分量在电网发生故障后一样存在,你所说的南瑞继保采用的工频故障分量已经不是负零序分量了,但它仍是故障分量。 我原以为,负序和零序和有无故障无关 我原以为,负序和零序和有无故障无关
p0o9i8u7 发表于 2009-12-22 22:09 https://tech.cepsc.com/images/common/back.gif
如果线路是非全相运行,负序分量当然也是有的 看了下以上的回复说的很不错 不管哪种教法我们只要知道最根本的原理就行了 故障分量顾名思义就是故障是出现的 至于零序和负序分量是我们用对称分量法分析问题时所用的名称而已 这两种量在物质上是存在的 回复 2# norika
NR继保 工频故障分量的距离保护原理应该不像继保教材讲得那么简单吧?能否具体介绍点儿详细内容,谢谢版主了? 回复norika
NR继保 工频故障分量的距离保护原理应该不像继保教材讲得那么简单吧?能否具体介绍点 ...
bhb4206 发表于 2009-12-23 14:48 https://tech.cepsc.com/images/common/back.gif
具体的算法实现就要咨询南瑞继保了,找个在南瑞继保的同学问问吧,看看能否拿到RCS931的程序代码看看 回复 8# norika
哦,谢谢啊 本帖最后由 楚大少 于 2009-12-28 18:24 编辑
When an unbalanced fault happens in the system, the relays will see zero sequence components or negative sequence components or both of them. This will depend on the type of the fault. And it will also depend on whether the system is grounded or not.
In normal power system, there will be some zero & negative sequence components even when the system is operating correctly. So when we are setting the relays, we should consider the worst case, in which the relays will see the largest zero or negative sequence components. And then the setting should be above the worst case. However, this is also changing as the communication among the relays are becoming more common.
I hope this is helpful;-) 路过学习了
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