| 摘要 |
PURPOSE:To enable to prevent an electric motor vehicle and a section from damaging at the time of an earth accident of a feeder line, by a method wherein a middle section corresponding to an existing section of trolley wire is provided, each of which is provided with a voltage relay which is actuated in response to respective voltage difference. CONSTITUTION:An existing section 12a and a middle section 12b are provided in a substation 1 and feeder lines 11a-11g are connected with an anode bus 4 through thyristor switches 5a-5f and disconnecting switches 7a-7f for feed. Now, when an earth accident occurs an earth current is electrified to a rail 13 through the switch 5a, disconnecting switch 7a and the feeder line 11a, potential difference is generated between feeder lines 11a and 11b, through which a voltage relay 16a is actuated, the switches 5a and 5e are turned off and the earth current is interrupted. An electric motor vehicle 14 and the section 12a, therefore, are prevented from damaging as a bypass current is not electrified even if the section 12a is earthed through pantographs 15a and 15b of the vehicle 14. |
