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在变电站,当强电流、高电压接通或断开时,引起周围空间电磁场发生变化,通过电路间的互感、分布电容等耦合及电磁场辐射,在弱电信号回路里将引起相应电流、电压的变化。而集成电路启动功率小,动作电压低且迅速,信号幅相特性的畸变,会造成集成电路产生误动作。消除干扰的措施有:1.合理敷设电缆把控制信号电缆放在电缆沟内下层支架上。因支架一般都和地网连接且上下层支架组成网状,对电缆有较好的屏蔽作用。把电力电缆、站用电力电缆、合闸电源电缆等放在上层支架上。控制和信号电缆每根分别固定在电缆支架上。每根尽量留有间隙,不能捆成一束;一对信号尽量在一条
In the substation, when the strong current and high voltage are on or off, the electromagnetic field in the surrounding space will be changed. Through the mutual inductance between the circuits, the distributed capacitance and other coupling and the electromagnetic field radiation, the change of the corresponding current and voltage will be caused in the weak signal loop . The integrated circuit startup power is small, the operating voltage is low and rapid, distortion of the signal amplitude and phase characteristics, will cause the integrated circuit malfunction. Measures to eliminate interference are: 1. Laying a reasonable cable control signal cable on the lower bracket in the cable trench. Because the brackets are generally connected to the ground and the upper and lower brackets form a mesh, the cable has a good shielding effect. Place the power cable, station power cable, closing power cable, etc. on the upper bracket. Each control and signal cable is fixed to the cable bracket. Each try to leave a gap, can not be bundled into a bunch; a pair of signals as much as possible in a