一送两受式无砟轨道电路发送信号频率

为确定一送两受式无砟轨道电路发送信号的频率范围,根据无砟轨道电路一次侧参数的频率特性和一送两受式无砟轨道电路调整态、分路态和断轨态的四端网系数表达式,在不同的道砟最小电阻、表面电导系数、输入端阻抗和输出端阻抗初始值下,用图解法对断轨灵敏度和分路灵敏度频率特性进行了仿真分析.结果表明:当一次侧参数为无砟轨道电路标准参数时,一送两受式轨道电路信号频率不应大于700 Hz.

Transmittal Signal Frequency of Centre-Fed Ballastless Track Circuit

To determine the frequency range of centre-fed ballastless track circuit,based on the frequency character of the first parameters and the two-port network coefficient expressions of centre-fed ballastless track circuit in normal,shunt and broken-rail operation modes and the different initial values of minimum ballast resistance,surface-conductivity coefficient,input impedance and output impedance,the frequency characters of track circuit broken sensitivity and train shunt sensitivity was simulated by the graphical method.The result shows that the frequency of centre-fed ballastless track circuit is not larger than 700 Hz when the first parameters is the standard parameters of ballastless track circuit.