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电力电缆现场安装及其故障诊断.ppt

  • 2026-05-31 07:58:35
电力电缆现场安装及其故障诊断.ppt
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1.导体

铜电阻系数为0.0184,比重8.9

铝电阻系数为0.031,比重2.7(铜30%)

66kV及以上不用铝芯)

要求线芯截面(mm2)规格:2.5、4、6、10、16、25、35、50、70、95、120、150、240、300、400、500、630、800、1000等20种规格

线芯数量与形状:单芯、两芯、三芯、四芯、五芯等五种,并依据线芯数量,将导线压成圆形、半圆形、扇形等形状;小截面实芯(即独股),大截面多股绞合

 2、绝缘

 1.油浸纸绝缘:怕水,需金属防水层,除500kV及以上超高压充油电缆外,基本被交联电缆所取代

 2.橡胶绝缘:乙丙橡胶电缆最高使用电压已达150kV。

 3.聚氯乙烯绝缘:介损大,含氯,运行温度低,普通只用于6kV及以下电压等级,将被淘汰。

 4.聚乙烯绝缘:熔融温度低(70℃),最高工作电压达500kV

 5.交联聚乙烯:经过化学或物理方法将聚乙烯分子链间相互交联。最高运行温度可达90℃,短路时导电线芯 

允许最高温度可达250℃。极大地提升了电缆安全载流量和短路容量。其最高工作电压达500kV。

 从1kV到220kV各种电力电缆中,交联聚乙烯(XLPE)是当前应用最广一个绝缘材料,几乎完全取代了纸绝缘。

3、屏蔽层

是一个将电缆产品中电磁场与外界电磁场进行隔离构件;有电缆缆产品在其内部不一样相(或线组)之间也需要相互隔离(屏蔽)。能够说屏蔽层是一个“电磁隔离屏”。高压电缆导体屏蔽和绝缘屏蔽(内外屏蔽)是为了均化电场分布。

4、保护层

作用: 保护电缆免受外界物质侵入和预防外力损伤。

组成: 内衬层(或内护套)、铠装层和外护套

材料: 与电缆绝缘种类、运行电压、使用环境相关.

如:纸绝缘电缆须有密封金属护套,而中低压

橡塑电缆就不需要;埋在地下电缆需要铠装,敷设在海底电缆需要钢丝铠装,而敷设在隧道、排管、电缆沟内电缆又能够不要铠装;外护套是用来保护铠装层或内护套,普通采取聚氯乙烯或聚乙烯,在需要防火场所也可做成阻燃型。 

在每相导电线芯上包缠称为相绝缘纸油浸纸绝缘带,在各相线芯绞合成缆同时,在各相线芯之间空隙填以纸绳,外面再包缠称为统包纸油浸纸绝缘带,

在统包纸外挤压上铅包作防水密封

依据安装场地需要在其外部再加上不一样保护层

在15kV及以下电压等级 。

二、电力电缆敷设

电力电缆惯用敷设方式:

1)直埋式敷设

2)预制式砖砌电缆沟敷设

3)排管电缆沟敷设

4)隧道电缆敷设

5)非开挖方式电缆敷设

1、直埋式敷设

直埋敷设方式普通用于少许、暂时性或不十分主要线路敷设。电缆直埋普通要求进行样洞开挖,在敷设路径每40~50m挖一样洞,在转弯处和跨路口处都应挖设,已确定电缆路径可行性。

直埋电缆沟挖设,普通深度为80cm,宽度为1根电缆40~50cm,2根电缆60cm,电缆条数增加按百分比放宽。

电缆敷设后现在上覆盖10cm细土或砂,再盖上电缆保护板,覆土后应在相关位置埋设电缆标桩。

2、预制或砖砌电缆沟敷设

盖板搭盖最少10cm,理想15cm

如无支架,注意电缆间距

4、隧道敷设

优点:

可敷设回路数多,易于巡检

缺点:

造价高

每天保证更新30+优质资源,为您提供2026电力领域的电力电气、继电保护及二次回路、电气试验、光储充微电网、风力发电、输配电工程、源网荷储、新型电力系统、虚拟电厂、现货与绿电交易、施工方案等

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  1. CONNECT:[ UseTime:0.000476s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000710s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000254s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000326s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000619s ]
  6. SELECT * FROM `set` [ RunTime:0.000240s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000709s ]
  8. SELECT * FROM `article` WHERE `id` = 524034 LIMIT 1 [ RunTime:0.000689s ]
  9. UPDATE `article` SET `lasttime` = 1780307624 WHERE `id` = 524034 [ RunTime:0.005048s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000305s ]
  11. SELECT * FROM `article` WHERE `id` < 524034 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000609s ]
  12. SELECT * FROM `article` WHERE `id` > 524034 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000496s ]
  13. SELECT * FROM `article` WHERE `id` < 524034 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001268s ]
  14. SELECT * FROM `article` WHERE `id` < 524034 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008898s ]
  15. SELECT * FROM `article` WHERE `id` < 524034 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001545s ]
0.089880s