配置BES型扼流适配变压器的道岔区段轨道电路调整表仿真计算

针对单开道岔区段1送2受型轨道电路电气特性,根据均匀传输线方程与四端网络理论建立典型25 Hz相敏轨道电路仿真计算模型;计算带BE型扼流变压器时轨道电路调整和分路状态下发送电压和电流,结果验证了该模型的正确性和有效性。将模型中的扼流变压器四端网络替换为BES型扼流适配变压器四端网络,从而将该模型拓展应用到带BES的轨道电路区段。根据实测数据计算BES型扼流适配变压器四端网络系数,再采用拓展的仿真模型,计算得到带扼流适配器轨道电路在1送2受区段的调整表。通过计算和分析该轨道电路区段的分路灵敏度和电压余量比可知,二者均满足轨道电路正常工作要求,道岔岔尖是1送2受型轨道电路区段中最易导致分路不良的机械环节。采用该拓展模型仿真计算还可得到轨道电路区段在不同道砟电阻情况的调整表。该模型也可拓展应用于三开、复式交分等道岔区段以及ZPW-2000A型等其他制式轨道电路调整表的计算。

Simulation and Calculation of Track Circuit Adjustment Table in Turnout Section Configured with BES Impedance Match Bond

Focusing on the electrical characteristics of the one-transmitter and two-receiver track circuit in the single turnout section, a typical 25Hz phase-sensitive track circuit simulation model was established based on the uniform transmission line equations and the four-terminal network theory. The sending voltage and current of the track circuit under the adjustment and shunting states with the BE impedance match bond were calculated. The calculation results verified the correctness and effectiveness of the model. The four-terminal network of the BE impedance match bond in the model was replaced by the four-terminal network of the BES impedance match bond, thereby extending the use of the model to the track circuit section with BES. Based on the measured data, the four-terminal network coefficients of the BES impedance match bond were calculated,and then the extended simulation model was used to calculate the adjustment table of the one-transmitter and two-receiver section of the track circuit with BES. By calculating and analyzing the shunting sensitivity and voltage margin ratio of this track circuit section, it could be seen that, both of them meet the normal working requirements of the track circuit, and the center of turnout was the mechanical section most likely to cause a poor shunting in the one-transmitter and two-receiver track circuit. Using this extended model, the adjustment tables of the track circuit with different ballast resistances were obtained through simulation and calculation.This model can also be extended to the calculation of the track circuit adjustment tables for other track circuit systems such as ZPW-2000A and other types of turnouts, such as three-throw turnout, double slip switch, etc.