摘要
调谐单元是ZPW-2000系列轨道电路系统的关键室外设备。调谐单元与空芯线圈及29 m钢轨共同组成LC并联谐振电路,利用LC并联谐振电路的极阻抗特性,有效降低移频信号在主轨道的衰耗,实现主轨信号的保真传输。同时,调谐单元利用其自身LC串联谐振表现出的零阻抗特性实现相邻轨道电路信号间的电气隔离。
The tuning unit is key outdoor equipment of ZPW-2000 series track circuit system. The tuning unit, hollow coil and 29m rail compose a LC parallel resonance circuit, and the polar impedance characteristic of the LC parallel resonance circuit is used to reduce shift frequency signal attenuation of the main track and implement main track signal fidelity transmission. At the same time, the tuning unit uses the zero impedance characteristic of its own LC series resonance to realize the electrical isolation between the adjacent track circuit signals.
出处
《铁路通信信号工程技术》
2017年第2期93-95,98,共4页
Railway Signalling & Communication Engineering
关键词
调谐单元
元器件配对
零阻抗
极阻抗
tuning unit
components matching
zero impedance
polar impedance
