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2021-02-01
羿资讯 | 电气装置的接地
1.各种接地装置利用直接埋入地中或水中的自然接地极,可利用下列自然接地极: (1)埋设在地下的金属管道,但不包括输送可燃或有爆炸物质 的管道。 (2)金属井管。 (3)与大地有可靠连接的建筑物的金属结构。 (4)水工构筑物及其他坐落于水或潮湿土壤环境的构筑物的 金属管、桩、基础层钢筋网。
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羿资讯 | 电气装置的接地
Date﹕2021-02-01|Source:Eclear Environmental

1.各种接地装置利用直接埋入地中或水中的自然接地极,可利用下列自然接地极:

(1) 埋设在地下的金属管道,但不包括输送可燃或有爆炸物质 的管道。

(2) 金属井管。

(3) 与大地有可靠连接的建筑物的金属结构。

(4) 水工构筑物及其他坐落于水或潮湿土壤环境的构筑物的 金属管、桩、基础层钢筋网


2. 接地装置的选择

(1) 建筑物的金属结构,梁、柱。

(2) 生产用起重机的轨道、走廊、平念、起重机与升降机的构 架、运输皮带的钢梁、电除尘器的构架等金属结构。

(3) 必藻广、变电站等接地装置除应利用自然接地极外,还应 敷设以水平人工接地极为主的接地网,并应设置将自然接地极和 人土接地极分开的测量井。对于3kV - 10kV的变电站和配电所, 当采用建筑物基础中的钢筋网作为接地极且接地电阻满足规定值 ,可不另设人工接地。

接地装置材料选择应符合下列规定:

1除临时接地装置外,接地装置采用钢材时均应热镀锌,水 平敷设的应采用热镀锌的圆钢和扁钢,垂直敷设的应采用热镀锌 的角钢、钢管或圆钢。

2当采用扁铜带、铜绞线、铜棒、铜覆钢(圆线、绞线)、锌覆 钢等材料作为接地装置时,其选择应符合设计要求。3不应采用铝导体作为接地极或接地线。

4.1.5接地装置的人工接地极,导体截面应符合热稳定、均压、机

械强度及耐腐蚀的要求,水平接地极的截面不应小于连接至该接 地装置接地线截面的75%,且钢接地极和接地线的最小规格不应 小于表4.1.54和表4.1.5^所列规格,电力线路杆塔的接地极引 出线的截面积不应小于50mm2 0

 

 

 

 

种类、规格及单位

 

地 下

圆钢直径(mm)

8

8/10

扁钢

截面积(mm2)

为48

48

厚度(mm)

 

4

角钢厚度(mm)

2.5

4

钢管管壁厚度(mm).

2.5

2^. 5/2. 5

种类、规格及单位

 

地 下

mm)

8

水平接地极8

垂直接地极15

铜排截面积(mm2) /厚度(mm)

50/2

50/2

铜管管壁厚度(mm)

2

3

铜绞线截面积(mm2)

50

50

铜覆圆钢直径(mm)

8

10

铜覆钢绞线直径(mm)

8

10

铜覆扁钢截面积(mm2) /厚度(mm)

48 /4

48 /4

 

 

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