Allen-Bradley【1756-CN2R】原装现货

17562R

17562R

17562R

17562R

鉴于本项目的规模，项目电气火灾检测点位的实际情况。无论在终端剩余电流探测器还是后台主机都是根据本项目的实际情况来进行设计的。

《联系人；欧先生》
《座机：0592-5709825》
《传真：0592-5917519》
《24小时热线：18030229053微信同步》
《QQ  ：2479261344》
《QQ邮箱：2479261344@qq》

4.1 本项目的系统特点可总结为一下3点：

4.1.1 终端探测器选用导轨式电气火灾探测器，方便安装、节省成本、便于后期维护。

4.1.2 RS485总线连接方便，可操作性强。总线布线时走的是弱电桥架，不会受到强电的影响，确保的整个系统的通讯稳定。

4.1.3 考虑到本项目中仪表数据量，客户要求。本项目的主机选用壁挂式。壁挂式主机界面简洁，系统操作方便，适合本项目中的配电间环境和客户的相关操作要求。

4.2 电气火灾系统工作原理

4.2.1 剩余电流测量是根据基尔霍夫电流定律：在同一时刻，电路中流入和流出一个节点的电流矢量和为零。以TN-S系统为例，将A/B/C/N同时穿过剩余电流互感器，当系统未发生漏电时，流入和流出剩余电流互感器的电流矢量和为零，此时，剩余电流互感器感应出的二次电流也为0;当某相对大地发生漏电，此时流入和流出剩余电流互感器的电流矢量和不再为零，其大小等于从大地流走的电流即漏电流。此漏电信号通过剩余电流互感器的二次接线传输至电气火灾探测器，经运算放大、A/D转换后送入CPU，经过一系列算法后，对变化的幅值进行分析、判断，并与报警设定值进行比较，若超出定值则发出声光报警信号并上送至后台电气火灾监控设备。

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