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电力电缆基础知识培训.ppt

  • 2026-05-30 22:11:53
电力电缆基础知识培训.ppt
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电力电缆分类

(1)按照绝缘材料分类:

油纸绝缘:粘性浸渍纸绝缘型(统包型;分相屏蔽型);不滴流浸渍纸绝缘型(统包型;分相屏蔽型);有油压,油浸渍纸绝缘型(自容式充油电缆;钢管充油电缆);有气压,粘性浸渍纸绝缘型(自容式充气电缆;钢管充气电缆)。

塑料绝缘:聚氯乙稀绝缘型;聚乙烯绝缘型;交联聚乙烯绝缘型。(常见)

橡胶绝缘:天然橡胶绝缘型;乙丙橡胶绝缘型。

(2)按传输电能形式分类:交流电缆和直流电缆。

(3)按照结构特征分类:

统包型(线芯成缆后,在外包有统包绝缘,并置于同一内护套内);

分相型(主要是分相屏蔽,一般用在10~35千伏,有油纸绝缘和塑料绝缘);(使用较为广泛)

钢管型(电缆绝缘外有钢管护套,分钢管充油、充气电缆和钢管油压式、气压式电缆);

扁平型(三芯电缆的外形呈扁平状,一般用于大长度海底电缆);

自容型(护套内部有压力的电缆,分自容式充油电缆和充气电缆。利用补充浸渍原理消除绝缘层中形成的气隙以提高工作场强的一种电力电缆)。

聚乙烯电缆结构

导体

800mm²以下采用拉模紧压成型﹐圆整度好﹐表面光滑﹐800mm²及以上采用分割导体结构﹐使电缆传输容量更大

内外屏蔽

内外屏蔽料均采用进口超光滑的XLPE料﹐经净化烘干后与绝缘料三层一次挤出﹐使电缆内外导表面光洁﹐电场分布均匀

主绝缘

主绝缘料采用进口超净﹑超光滑XLPE料﹐与内外屏蔽三层共挤﹑紧密结合

缓冲层

采用半导电丁基胶带和铜丝布的有机结合﹐既能满足电缆绝缘的热膨胀要求﹐又能使绝缘屏蔽与铝护套有效接触﹐确保电缆长期稳定运行

金属屏蔽

采用2.2mm厚度皱纹铝包以满足短路容量及屏蔽之需﹐连续式皱纹铝包使电缆的径向阻水性能满足高水位环境之需

沥青涂层

沥青涂层可防止皱纹铝套受到腐蚀﹐电缆使用寿命更长

外护层

采用PVC或PE料进行挤包﹐以满足电缆电性能及机械性能之需﹐也可采用阻燃型﹑防白蚁型材料以满足不同场合之需

石墨涂层

作为外护层耐压电极﹐连续光滑

电线、电缆的选择应符合下列要求

按照敷设方式,环境温度及使用条件确定导体的截面,且额定载流量不应小于预期负荷的最大计算电流。

线路电压损失不应超过允许值。

导体最小截面应满足机械强度的要求。

导线敷设路径的冷却条件:沿不同冷却条件的路径敷设绝缘导线和电缆时,当冷却条件最坏线段的长度超过5m时,应按该线段条件选择绝缘导线和电缆的截面,对于已经敷设好的线路,导线载流能力应按80%计算。

按照发热要求,塑料绝缘和橡皮绝缘导电线芯的最高允许工作温度不得超过65℃,一般裸导线也不超过70℃。

电缆附件安装的基本操作工艺

基本要求 :终端头和中间接头是电缆线路中最薄弱的部分,其安装质量的好坏是电缆线路能否安全运行的关键,应给予足够的重视。

1)终端头和中间接头在安装时要防潮,不应在雨天、雾天、大风天制做电缆附件;平均气温低于0℃时,电缆应预先加热。

2)施工中要保证手和工具、材料的清洁,操作时不应做其他无关的事(特别不能抽烟!)。

3)所用电缆附件应预先试装,检查规格是否同电缆一致,各部件是否齐全,检查出厂日期,检查包装(密封性),防止剥切尺寸发生错误。

电缆(终端)头基本安装工艺

1)剥外护套:为防止钢甲松散,应先在钢甲切断处内侧把外护层剥去一圈(外侧留下),做好卡子,用铜丝绑紧钢甲并焊妥钢甲接地线。最后剥外护套。

2)锯钢甲:上一步完成后,在卡子边缘(无卡子时为铜丝边缘)顺钢甲包紧方向锯一环形深痕,(不能锯断第二层钢甲,否则会伤到电缆),用一字螺丝刀撬起(钢甲边断开),再用钳子拉下并转松钢甲,脱出钢甲带,处理好锯断处的毛刺。整个过程都要顺钢甲包紧方向,不能把电缆上的钢甲搞松。

3)剥内护绝缘层:注意保护好相色标识线,保证铜屏蔽层与钢甲之间的绝缘。

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  1. CONNECT:[ UseTime:0.000526s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000788s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000320s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000248s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000460s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000495s ]
  8. SELECT * FROM `article` WHERE `id` = 523446 LIMIT 1 [ RunTime:0.000413s ]
  9. UPDATE `article` SET `lasttime` = 1780326146 WHERE `id` = 523446 [ RunTime:0.004086s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000237s ]
  11. SELECT * FROM `article` WHERE `id` < 523446 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000420s ]
  12. SELECT * FROM `article` WHERE `id` > 523446 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003595s ]
  13. SELECT * FROM `article` WHERE `id` < 523446 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000672s ]
  14. SELECT * FROM `article` WHERE `id` < 523446 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000532s ]
  15. SELECT * FROM `article` WHERE `id` < 523446 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000651s ]
0.081071s