⎝⎛星力捕鱼⎞⎠

⎝⎛星力捕鱼⎞⎠ page Company Profile ⎝⎛星力捕鱼⎞⎠ Product center Quality system marketing network After sales service Recruitment contact us
Flow meter series
Temperature instrument series
Pressure instrument series
Calibration instrument series
Level instrument series
Digital display instrument series
Transmitter instrument series
Wire and cable series
Bridge instrument cabinet series
Pipe fitting valve series

Address: Xiongyi, Jinhe Road, Jinhu County, Jiangsu Province
Lunan
Phone: 0517-86900901
0517-86900921
0517-86900920
Fax: 0517-86900902
Postcode: 211600
http://zzyfwh.com
Email: chinadongxiang@163.com
Industry Information
Several aspects that power cables should pay attention to during construction (2)
2011-9-28 9:18:12

   关于电缆网络 及电缆网络自动化 Fourth , about cable network and cable network automation

在配电网中的不断推广与使用, 一般 配电网可 分为电缆网络和架空网络( 其中包括 架空、电缆混合网络) With the continuous promotion and use of power cables in distribution networks, general distribution networks can be divided into cable networks and overhead networks ( including overhead and cable hybrid networks ) . The " Implementation and Supplementary Opinions on" Technical Guidelines for the Reconstruction of Medium and Low Voltage Distribution Networks in Cities "also put forward specific requirements for the automation of cable distribution networks. ,应 按照配电自动化的要求,采用新技术、新设备,有条件的要考虑自动化试点工作, 条件不成熟的也要在配套设备选型时,考虑 有充分余地,为实现自动化方案打下 坚实的 基础。 Therefore, when the cable network is adopted in the regional network of the power distribution network , new technologies and equipment should be adopted in accordance with the requirements of power distribution automation. Where possible, automation pilot work should be considered, and those with immature conditions should also use supporting equipment In the selection, consider that there is sufficient room to lay a solid foundation for the realization of automation solutions .

   电力电缆 施工中应注意的问题 V. Problems to be noticed in the construction of power cables

   1 由于 大电流电力电缆 引发的涡流问题 ( 1 ) , Eddy current problems caused by high-current power cables

的过程中 ,有 采用钢支架,有 采用钢质保护管, 采用电缆卡与架空敷设, 凡是在电力电缆周围形成钢( ) 性闭合回路的, 有可能形成涡流, 尤其 是在大电流电力电缆系统中,涡流更大。 During the construction of power cables , some use steel brackets, some use steel protective tubes, and others use cable cards and overhead laying. All steel ( iron ) closed loops are formed around power cables . Eddy currents can form, especially in high-current power cable systems, where eddy currents are greater.

   2 由于 电力电缆 的转弯 引起的机械性损伤问题 ( 2 ) Mechanical damage caused by turning of power cables

运输、敷设 方面比 较为困难, 同时 电力电缆对转弯半径的要求也比较严格。 Due to the large outer diameter of the power cable , it is more difficult to transport and lay it . At the same time, the power cable has stricter requirements on the turning radius. 的过程 中,如果转弯角度过大,可能 会导致 导体内部受到机械损伤, 而机械损伤因被电缆绝缘层掩盖而 没有办法 法看到,即使测量回路电阻,绝缘和泄露试验也很难发现缺陷,运行 则在受损处 ,因 过热使电缆绝缘强度下降,直到出现故障。 During the construction of power cables , if the turning angle is too large, it may cause mechanical damage to the inside of the conductor. However, the mechanical damage can not be seen because it is covered by the cable insulation layer . Even if the circuit resistance is measured, the insulation and leakage tests are also It is difficult to find defects, and it is in the damaged place when running . Overheating reduces the cable insulation strength until failure.  

3 电力电缆 防潮问题 ( 3 ) Moisture resistance of power cables

   运行经验表明,中、低压电力电缆故障大部分为电缆中间接头和终端头故障,而中间接头和终端头故障则大部分是 由于 密封不良,潮气侵入而造成绝缘程度下降,而中、低压电力电缆网多 采用 的是 树枝状供电方式,电缆终端头数量较多,因此把好电缆终端头和中间接头堵漏密封关是保证电缆安全可靠运行的重要措施之一。 According to daily operating experience, most of the failures of medium and low voltage power cables are failures of the cable intermediate joints and terminal heads, while most of the failures of the intermediate joints and terminal heads are due to poor sealing and moisture intrusion, which reduces the degree of insulation. Most of the low-voltage power cable networks use a dendritic power supply method, and the number of cable terminals is large. Therefore, it is one of the important measures to ensure the safe and reliable operation of the cable by plugging and sealing the cable terminals and intermediate joints.

   4 中、低压电力电缆接地问题 ( 4 ) Grounding problems of medium and low voltage power cables

中、低压电力电缆网上,由于三相负荷不是相等的, 所以 ,如果采用有金属护层的电缆,必须考虑金属护层的接地问题,并保证在金属护层的任一点非接地处的正常感应电压不得大于100V。 On public medium and low voltage power cable networks, since the three-phase load is not equal , if you use a cable with a metal sheath, you must consider the grounding of the metal sheath and ensure that it is not grounded at any point on the metal sheath. The normal induced voltage must not be greater than 100V. 设置接地极( ) ,并 且要 使 金属护层可靠接地。 In medium and low voltage cable networks, a ground electrode ( net ) should be set at all cable joints , and the metal sheath should be reliably grounded.