| 摘要 |
<p>PURPOSE:To enable the oscillation of a DC filter in a DC electric rolling stock to be easily suppressed, by connecting the parallel circuit of a superconductor and a resistor to the DC input of a filter circuit. CONSTITUTION:The voltage of a DC stringing 1 is fed to an induction motor 11 via a pantograph 2, a high-speed breaker 5, the parallel connected and com posed unit of a superconducting unit 6 and a bypass resistor 7, a filter circuit consisting of a reactor 8 and a capacitor 9, and an inverter 10. At the time of starting, the resistance value of the superconducting unit 6 is less, and so the current of the reactor 8 is turned greater in the shape of a sine wave. When the current comes to a fixed degree or more, then the resistance value of the superconducting unit 6 is turned greater, and the current is biased also to the resistor 7 to flow to. As a result, oscillating current is suppressed, and capacitor voltage is oscillated and is not turned into overvoltage.</p> |
