防止使用金属对称导体的通信线路受到雷击引起浪涌 |
ITU-T K.46建议书给出了利用金属对称导体(即,绞线对电缆)防止近距离闪电产生的过载电压和电流对线路的影响以保护电信线路的程序。 该程序是在通过一系列段和点表示的线路和对每一节点对闪电诱发的电涌暴露的评估基础上制定的。根据节点的暴露、地面落雷密度和大地电阻率计算出每年发生的超过额定电压电平的电涌的次数。如果电压电平被认为是节点的冲击耐受电压,则此电平之上的电涌次数与每年节点受损的次数相吻合。次数乘以诱发电涌造成的损失可以得出间接闪电造成的故障风险。所有节点的最大风险就是线路的风险。 根据IEC62305-2,间接闪电造成的故障风险可用来对电信线路构成的更大的系统进行风险评估。电路所有者(即,电信运营商)也可以使用计算得出的风险预估是否有必要在线路上采取额外保护措施。在这种情况下,计算所得风险应与间接闪电(RTi)的可允许风险进行比较,后者是根据ITU-T K.72计算得出的。如果计算所得风险低于允许限值,那么线路的保护是充分的。否则,有必要采取额外保护措施直至损失风险小于或等于允许的限值。 附录包括以下内容:附录1给出了电缆护套电气特性数据,附录2给出按照本建议书指导编制软件的算法,附录3给出了线路附近闪电收集区的计算方法,附录4是计算示例。 |
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Citation: |
https://handle.itu.int/11.1002/1000/11630 |
Series title: |
K series: Protection against interference |
Approval date: |
2012-05-29 |
Provisional name: | K.pair |
Approval process: | AAP |
Status: |
In force |
Maintenance responsibility: |
ITU-T Study Group 5 |
Further details: |
Patent statement(s)
Development history
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ITU-T Supplement
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Title
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Status
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Summary
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Table of contents
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Download
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K Suppl. 3 (10/2015)
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ITU-T K.20, K.21, K.45, K.82 – Additional criteria to protect telecommunication cabling during a power cross event
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In force
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here
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here
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here
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K Suppl. 8 (11/2017)
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Resistibility analysis of 5G systems
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In force
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here
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here
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here
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K Suppl. 9 (05/2019)
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5G technology and human exposure to radiofrequency electromagnetic fields
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In force
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here
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here
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here
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K Suppl. 10 (11/2017)
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Analysis of electromagnetic compatibility aspects and definition of requirements for 5G mobile systems
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In force
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here
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here
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here
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K Suppl. 13 (12/2021)
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Radiofrequency electromagnetic field (RF-EMF) exposure levels from mobile and portable devices during different conditions of use
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In force
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here
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here
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here
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K Suppl. 14 (09/2019)
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The impact of RF-EMF exposure limits stricter than the ICNIRP or IEEE guidelines on 4G and 5G mobile network deployment
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In force
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here
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here
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here
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K Suppl. 16 (10/2022)
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Electromagnetic field compliance assessments for 5G wireless networks
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In force
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here
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here
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here
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K Suppl. 19 (09/2019)
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Electromagnetic field (EMF) strength inside underground railway trains
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In force
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here
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here
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here
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K Suppl. 29 (07/2022)
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Electromagnetic field strength inside and outside of electric vehicles using wireless power transfer technology
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In force
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here
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here
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here
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Title |
Approved on |
Download |
Mitigation measures for telecommunication installations – Chapter 10
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2006
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here
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Mitigation measures for telecommunication installations
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2004
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here
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Earthing and bonding
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2003
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here
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Guide to the use of ITU-T Publications produced by Study Group 5 aimed at achieving Electromagnetic Compatibility and Safety
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2002
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here
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The protection of telecommunication lines and equipment against lightning discharges – Chapters 9 and 10
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1995
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here
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The protection of telecommunication lines and equipment against lightning discharges – Chapters 6, 7 and 8
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1978
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here
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Earthing of telecommunication installations
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1976
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here
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