IEC60364-5-54对“变电所中性点接地位置”的图示
《关于王厚余老师“变电所中性点不直接接地”提法的疑问?》一贴有些长了,我重开一贴,IEC最新标准的图示显示得很清楚。这些图在GB16895.3-2004中还没有。大家照此办理即可。C1Water pipe, metal from outside
C2Waste water pipe, metal from outside
C3Gas pipe with insulating insert, metal from outside
C4Air-conditioning
C5Heating system
C6Water pipe, metal e.g. in a bathroom
C7Waste water pipe, metal e.g. in a bathroom
DInsulating insert
MDBMain distribution board
DBDistribution board
METMain earthing terminal
SEBTSupplementary equipotential bonding terminal
T1Concrete-embedded foundation earth electrode or soil-embedded foundation earth electrode
T2Earth electrode for LPS if necessary
LPSLightning protection system (if any)
PEPE terminal(s) in the distribution board
E/PENPE/PEN terminal(s) in the main distribution board
MExposed-conductive-part
1Protective earthing conductor (PE)
1aProtective conductor, or PEN conductor, if any, from supplying network
2Protective bonding conductor for connection to the main earthing terminal
3Protective bonding conductor for supplementary bonding
4Down conductor of a lightning protection system (LPS) if any
5Earthing conductor 热心人~{:42:} 回复 3# 治学以诚
无论在哪,变压器的PEN应先引入配电柜,再从配电柜中引出接地导电体接地,而不应在变压器处就近接地。 哪位兄弟解释解释这个图示。。。。
老诚,你行不。。。。 本帖最后由 911room 于 2011-1-7 09:36 编辑
回复 6# 冷若冰
IEC60364-5-54原文是:
543.4.3If, from any point of the installation, the neutral/mid-point/line and protective functions are provided by separate conductors, it is not permitted to connect the neutral/mid-point/line conductor to any other earthed part of the installation. However, it is permitted to form more than one neutral/mid-point/line conductor and more than one protective conductor from the PEN, PEL or PEM conductor respectively.
The PEN, PEL or PEM conductor shall be connected to the terminal or bar intended for the
protective conductors (see Figure 54.1a), unless there is a specific terminal or bar intended for the connection of the PEN, PEL or PEM conductor (examples are given in Figures 54.1b and 54.1c). 这段文字与现行GB16895.3-2004的描述没有区别,即:
543.4.3如果从装置的任一点起,中性导体和保护导体分别采用单独的导体,则不允许将该中性导体再连接到装置的任何其他的接地部分(例如,有PEN导体分接出的保护导体)。然而,允许有PEN导体分接出的保护导体和中性导体都超过一根以上。对保护导体和中性导体,可分别设置单独的端子或母线。在这种情况下,PEN导体应接到为保护导体预设的端子或母线上。 本帖最后由 东海龙王 于 2011-1-8 09:13 编辑
人家图上已经标了MDB,老诚。 本帖最后由 东海龙王 于 2011-1-8 09:48 编辑
回复治学以诚
无论在哪,变压器的PEN应先引入配电柜,再从配电柜中引出接地导电体接地,而不应在变压 ...
911room 发表于 2011-1-6 09:08 http://www.jzdq.net.cn/club/images/common/back.gif
1、题目改成“重复接地的图示”是不是更好?
2、既然引用IEC标准,仔细看看IEC TC64主席的关于低压系统接地的幻灯片。 IEC TC64主席的幻灯片 在哪? 回复 11# sccat
不知坛子里有没有,我知道在以下官网有:
http://tc64cn.org/user.asp 结合专家提法个人观察:室外变压器带室内变电所,变压器处低压N点接地,变电所PEN线末端重复接地。如果是箱式变电站变压器低压N点与低压柜N排、PE排母线连接,只需一点接地。 不知楼主是哪位高人,IEC还是没给出到底是N,PEN,还是PEN,PE。。。。。 变压器处低压N点接地,变电所PEN线末端重复接地。———— 你这样是不是接地两次了。。。。