FIELD: automation systems; transportation.
SUBSTANCE: invention relates to a system for automation of traction power supply of railways, namely to devices for automation of supply lines of an ac contact system. Device includes in-series connected the second output closing contacts of the relay-follower of the disconnected position and the relay for fixing the control command of the first switch, the time relay with the closing contact and the first and the second intermediate relays with the opening and closing contacts, respectively. Second outputs of the closing contacts of the first and second voltage relays are connected to the first output of the coil of the first intermediate relay, the second output of which is connected to the "+" bus. Sequentially connected second output closing contacts of relay-follower and relay of fixation are connected by one end to "-" bus, and by the other – to the first output of coil of time relay, the second output of which is connected to "+" bus. Sequentially connected closing and opening contacts of time relay and first intermediate relay, respectively, are connected by one end to "-" bus, and by the other – to the first output of coil of the second intermediate relay, the second output of which is connected to "+" bus. Closing contact of the second intermediate relay is connected by one end to the "-" bus, and by the other end – to the relay of single repeated switching in parallel to the opening contact of the relay of control commands fixation by the first switch. Control of induced voltage for AR locking is introduced in 0.5–1 s up to preset time of automatic reclosure in the terminal.
EFFECT: high reliability of determining a stable short circuit with the AR function, taking into account the recovery time of the traction network insulation.
1 cl, 2 dwg
