高压10kv开关柜带电显示器显示缺相,但pt柜测量的并不缺相

2025-03-11 04:14:53
推荐回答(3个)
回答1:

pt柜测量的是三相正常 我不太明白这句话意思
”pt柜测量的 “这句话的意思是 :1、在pt柜上测量发现三相是正常的 1(怎么测量)

2、还是就是 pt测量柜

我大致猜测下

先回答第二个假设 :
如果你是用验电器测量的发现三相正常,估计你的带点显示器出现问题,也许你会问怎么可能十几个柜子的带点显示器一起出现问题,告诉你有可能,这个和系统的运行方式有关不再深究。

再回答第二个假设,估计你要问的就是这个问题
我们一般在PT柜上去看电压基本都是通过电压转换开关的切换 查看电压表是否有读数(下面的回答就是针对这种情况)

首先PT的接法有很多种,我说典型的 VV接法

你要注意其中很关键的一点就是 我们看到的电压是线电压 ============
VV接法 两个PT连接ABC相

测量到的是线电压 假设系统真的缺相运行 ,那么不管电压转换开关怎么转 电压表上都是有读数的 AB BC AC 至于这个读数 有可能两个偏低 一个正常 或是三个都正常

不过我觉的应该是三个都正常

为什么呢?
因为如你说的10KV系统 ,10kV系统有个特点就是 大接地系统 而大接地系统 变压器低压侧都是 三角形接线

三角形接线的话 有一个特点 就是线电压等于相电压 讲到这里估计你就明白了

只要这样的系统 缺相运行 (缺一相)不管你怎么打转换开关 电压读数都一样。

我说的有偏见 或是不是你描述的那样,如果有问题请追问

回答2:

如果十几台高压柜都显示缺相,而且是同一相,那就是典型的单相接地故障.根据带电显示器的接线,不显示的相对地电压等于零.

回答3:

单相接地,请检查相对地电压,

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