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目前现场基本采用HF4-25型防护盒代替原来的HF2-25、HF3-25型防护盒。由于25 Hz相敏轨道电路使用环境各有不同,钢轨阻抗、道床参数的变化,以及各种轨道电路器材参数离散性的影响等,使25Hz防护盒对不同衰耗、相移的补偿差异增大。因此,对于补偿不好的轨道区段,通过改变HF2-25、HF3-25型防护盒中的电感和电容值,研制出了HF4-25型防护盒,以减少电气化牵引的干
At present, the basic use of HF4-25-type protective box instead of the original HF2-25, HF3-25-type protective box. Due to the different use environment of 25 Hz phase sensitive track circuit, the change of rail impedance, the change of ballast bed parameters and the dispersion of parameters of various track circuit equipment, the compensation difference of 25 Hz protective box for different attenuation and phase shift is increased . Therefore, HF4-25 type protective case has been developed to reduce the dryness of electrified traction by changing the inductance and capacitance in HF2-25 and HF3-25 type protective cases for badly compensated orbit sections