| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric railway power synchronizing signal detector which can obtain equal synchronization accuracy extending for a long period, by making it hard to be subjected to the influence of the secular change of an element or the individual difference of a device. SOLUTION: The electric railway power synchronizing signal detector, which generates a power synchronizing signal FlgZERO synchronized with the fundamental wave of power voltage, based on the voltage of a transformer where the power voltage of a single-phase AC aerial line is applied, is equipped with a voltage detection means (11) which directly or indirectly detects the voltage applied to a transformer, an analog digital converter means (12) which converts the voltage detected by the voltage detection means into digital quantity, and a power synchronizing signal generation means (30) which receives the input of the digital quantity converted by the analog digital conversion means and generates a power synchronizing signal, synchronized with the fundamental waves of the power voltage through digital processing. |
