The invention discloses a high-voltage isolation switch control circuit which comprises a relay, an isolation switch control module and a high-voltage isolation switch ground solenoid valve. A control coil of the relay is connected with the secondary side of a high-voltage potential transformer of a train to switch off a normally-closed switch of the relay when the voltage of the secondary side of the transformer is higher than a preset value; the second end of the normally-closed switch is connected with the first end of the isolation switch control module; the second end of the isolation switch control module is connected with the first end of the high-voltage isolation switch ground solenoid valve. The normally-closed switch of the relay is in series connection with the isolation switch control module and the high-voltage isolation switch ground solenoid valve sequentially, once the normally-closed switch of the relay is switched off, the high-voltage isolation switch ground solenoid valve cannot get electricity which means a high-voltage isolation switch cannot be earthed. Under the pantograph rising state of a pantograph, the voltage of the secondary side of the transformer is higher than a certain preset value, and the high-voltage isolation switch cannot be earthed due to the erroneous breakover of the isolation switch control module.
High-voltage isolation switch control circuit
2015-05-13
Patent
Electronic Resource
English
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