“25Hz phase detecting track circuit”的概念、定义、翻译、参考文献-科学参考

单词	25Hz phase detecting track circuit
释义	25Hz phase detecting track circuit Encyclopedia 工学轨道电路释 25Hz phase detecting track circuit25赫兹相敏轨道电路具有两个供电单元传送25赫兹交流信号，除从钢轨取得电源外，还需另外供给局部电源，采用调相方式的轨道电路制式。当两个单元同时得到规定相位差的25赫兹交流电源时，轨道继电器吸起，否则落下，用于反映本区段有、无列车两种状态的25赫兹交流信号的轨道电路。
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