1336F-B250-AA-EN-HA2
发布时间：2019-02-18 11:49:25点击率：
1336F-B250-AA-EN-HA2
1336F-B250-AA-EN-HA2
1336F-B250-AA-EN-HA2
1336F-B250-AA-EN-HA2
1336F-B250-AA-EN-HA2
本文根据某地铁线路Acrel-6000/B电气火灾监控系统的实际设计、施工、调试和运营情况，对因漏电流引起电气火灾的相关技术问题和施工问题进行分析研究，进而总结出一套安全有效的电气火灾监控系统应用方案，以期为其他城市轨道交通的相关设计和施工人员提供帮助和参考。
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1.漏电流引发电气火灾的原因
一般情况下，交流供电电缆的漏电流产生有两个原因，一是电缆与地之间存在电容，二是电缆与地之间的绝缘电阻并非无穷大。电容引起的漏电流较小，漏电流主要取决于对地电阻。当电缆受损或老化，对地绝缘电阻下降，加之现场环境潮湿时，电缆的漏电流就会显著增加。研究表明，当漏电流值达到300mA时，就可能形成电弧，进而引发火灾事故。
合理设置监控点，对电缆漏电进行早期预警，则可以提前发现和消除火灾隐患。电气火灾监控系统是一种新型综合系统，它可以对漏电流进行早期的监控和报警。该系统在城市轨道交通中的应用近几年才开始，大部分还处于设计或招标阶段，因此具有重要研究价值。
2.电气火灾监控系统原理及功能
2.1工作原理
2.1.1漏电流检测原理
基尔霍夫电流定律( KCL)及其推论指出，在任一瞬间，通过电路中任一不包含电源的假设封闭面的电流矢量和为零。如图1所示，在正常情况下，三相四线电源的电流矢量和为零，即IL1+IL2+IL3+IN=0，此时设备对地电流IE和电缆对地电流IZ均为0，电流互感器测得的泄漏电流IL=0。当用电设备发生接地故障时，有IE≠0，当电缆绝缘受损时，有IZ≠0， IL1+IL2+IL3+IN≠0，此时，电流互感器中的感应电流IL ≠0，经电气火灾探测器运算处理，从而确定漏电流的存在。
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HP Z600 / Z800 Intel Xeon E5620 2.40GHZ CPU Kit WG728AA
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HP Processor Heatsink for ProLiant DL170 G6 / DL1000
IBM HS22V Intel Xeon E5620 2.40GHZ CPU Kit 69Y0927
HP Proliant DL360 G4p Server Xeon 3.20GHz 1GB RAM
HP Proliant DL380 G3 Server Intel Xeon 3.2GHz 1GB RAM
HP Proliant DL380 G3 Chassis Only
HP Proliant DL380 G6 Server 1 X QC E5620 2.4GHZ 8GB RAM
Dell PowerEdge R410 Xeon E5506 2.13GHZ 4GB 1X300GB
HP Proliant DL580 G5 Dual Xeon E7440 2.40GHZ 16GB RAM
HP Proliant DL380 G6 Server 1 X QC E5620 2.4GHZ 8GB RAM
Dell Poweredge M710 Blade Xeon E5620 2.40GHZ 4GB RAM
Dell Poweredge 1950 Dual Xeon E5345 2.33GHZ 4GB RAM
HP Z600 Workstation Xeon E5520 2.26GHZ 4GB RAM 1 X 1TB
Dell Poweredge 2950 Server Xeon E5345 2.33GHZ 4GB RAM
HP Proliant DL380 G5 Xeon E5205 1.86GHZ 4GB RAM
HP Z800 Workstation Dual Xeon X5650 2.66GHZ 32GB RAM
IBM System X3500 Xeon E5410 2.33GHZ 4GB RAM 1 X 1TB
HP Z600 Workstation Dual Xeon E5504 2.0GHZ 4GB RAM
Dell PowerEdge R410 Dual Xeon E5520 2.26GHZ 16GB
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