提高微机变电站综合自动化系统抗干扰能力的几项措施

在微机变电站综合自动化系统中,为了保证数字信号处理子系统采集到的信号有精度的频率、相位和足够的幅度,采用实验的手法,去观察和分析传感器输出信号、前置放大电路输出信号、电压比较电路输出信号、系统电源输出电压的波形等.根据不同电路信号频率、幅度和相位的特点与实际需要,利用LC低通无源滤波器和乘法器方式的功率因数纠正电路来过滤采集信号中含的杂波.利用窗口电压比较器使采集信号幅度位于两个指定的门限(参考电平)之间.使用这些措施得到结果是微机变电站综合自动化系统处理信号能力更准确、更快、更安全、更稳定.

The anti-jamming ability is improved in integrated automation system of microcomputer substation by several measures

The signal has collected get to sufficient amplitude ccuracy frequency ccuracy phase in integrated automation system of microcomputer substation, the waveform is observed and analyzed in output signals of sensor circuit and preamplifier circuit and voltage comparison circuit and power supply circui by experimental methods, according to needs and characteristics of different circuits on frequency and amplitude and phase, the noise is filtered base on passive LC low pass filter and switching power supply of adjustable power factor. the noise is specified between two threshold (reference) in integrated automation system base on window voltage comparator.in practice, the signal is dealed get more accurater more faster more securer more stabler.in integrated automation system of microcomputer substation by several measures.