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分析中央发送两端电流接收式无绝缘轨道电路,必须考虑电流传感器参数及其接收电路等效阻抗对轨道电路的影响。通过电路变换,推导轨道电路接收端及轨道电路的等效电路,建立轨道电路断轨态等效电路及其二端口网络模型。根据等效电路,推导断轨态数学模型,给出传输矩阵参数以及接收端钢轨电流、感应电压和转移阻抗的计算公式。算例结果表明:电流传感器参数及其接收电路等效阻抗对轨道电路的影响,可以通过分析传感器等效阻抗参数对轨道电路的转移阻抗的影响得到;传感器等效阻抗越小,转移阻抗越小,则电流传感器处钢轨电流及其感应电压越大;当传感器等效阻抗为零时的算例结果与文献[4]的有关结果一致,说明给出的分析方法和结论是可信的,并且说明文献[4]是本文在传感器等效阻抗为零条件下的特例。
Analysis of the central sending both ends of the current receiving non-insulated track circuit, the current sensor parameters must be considered and the receiving circuit equivalent impedance of the track circuit. Through the circuit transformation, the equivalent circuit of the receiving circuit and the track circuit of the track circuit is deduced, and the equivalent circuit of the rail circuit and the two-port network model are established. According to the equivalent circuit, the mathematical model of the broken rail state is deduced, and the formulas of the transmission matrix parameters and the rail current, the induced voltage and the transfer impedance at the receiving end are given. The experimental results show that the influence of the current sensor parameters and the equivalent impedance of the receiver circuit on the track circuit can be obtained by analyzing the influence of the equivalent impedance parameters of the sensor on the transfer impedance of the track circuit. The smaller the equivalent impedance of the sensor, the smaller the transfer impedance , Then the current sensor rail current and the greater the induced voltage; when the equivalent impedance of the sensor is zero when the results of the case with the reference [4] the relevant results, indicating that the analysis methods and conclusions are credible, and Description [4] is a special case of this paper where the equivalent impedance of a sensor is zero.