IC697PWR710
IC697PWR710
IC697PWR710
IC697PWR710
FD故障探头主要由故障电流检测电路、就地指示部分、数字编码及无线调制发射单元组成。在线路发生相间短路故障时，故障分支上的FD在故障后将被触发，
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《邮箱：2479261344@.com》给出红色显示，同时将其数字编码信号通过发射单元，以无线电波的方式发射出来，发射频率一般在220MHz，通讯距离在50m。其短路检测部分的工作原理是：根据线路短路时的特征，通过电磁感应方法测量线路中的电流突变及持续时间判断故障，因而它是一种适应负荷电流变化，只与故障时短路电流分量有关的故障检测装置。它的判据比较全面，可以大大减少误动作的可能性。如当系统运行结构变化，负荷变大时（如图2 .l）；当有大的负荷投切，大的电动机负荷的投人时（图2 .2 ）；当系统中出现短时励磁涌流（图2 .3）时；当投入大负荷后，人为停电时（图2 .4 ），FD探头均能有效识别而不动作，只有流过短路电流时才给出故障指示。
2.2.2 ST发射子站
发射子站一般安装在线路分支点处，它能接收两个分支共6个FD的编码信息，它与FD的关系一般是1只对6只为一组，当它收到故障探头的动作信号并经处理后，通过地址编码和时序控制，再将信息以无线电波方式发射出去，它的发射频率为220MHz左。发射子站的所有元件安装在一个铁箱中，内部包含一个铅酸蓄电池。箱体外部安装一个太阳能电池板，用以给蓄电池充电，并在白天作为工作电源。在夜晚或阴雨天气时，由蓄电池供电。蓄电池在充足电后的情况下，可以维持子站连续20天工作，不需要补充能量。
2.2.3 RP中继站
如果发射子站与接收主站间有大的障碍物或距离超过10km时，需要在其间加设无线中转站，它可以接收子站的信息，然后再转发至接收总站。中继站与发射子站类似，发射频率亦为220MHz。因其接收电路部分的守侯电流较大，所以后备蓄电池的容量较大，同时还备有太阳能电池板，白天由太阳能电池供电，夜晚或阴雨天气由蓄电池供电。中继站接收的数据信息不加修改，仍以无线方式将原数据再转发出去。
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