| 摘要 |
Device for protection of rail circuit of sections of alternating current traction against effect of back direct traction current includes power protective switching blocks installed at ends of rail track, circuit for control of those, track throttle transformers, power switch blocks connected with power outputs to middle points of two throttle-transformers of two throttle points, one of blocks is installed at the boundary of station of joint and polygon of electric traction of alternating current and the other one – at distance from the first one not smaller than length of two block=sections, equipped with limiting relay one coil of which that is shunted with condenser through connected in sequence variable resistor and diode is connected to the middle point of throttle-transformers and the other one – through connected in series variable resistor is connected to output of direct current of transformer of alternating-direct current. Alternating current input of transformer through locking contact of limit relay is connected to source of alternating voltage to which through disconnection contact of limit relay block for formation of switch signal is connected, its output is connected to respective switch-out input of power protective switch block switch-on input of which is connected to input of block of formation of switch-on signal input of which is connected to output of direct current of transformer of alternating-direct current. To power supply circuit of alternating current of the transformer in series with contact of limit relay at stage throttle point of end of zone of protection disconnection (back) contact of relay of signal light yellow light is included. On throttle point of boundary of joint station – disconnecting (back) contact of indicator of occupation of second in direction of motion of train station rail track and disconnecting (back) contact of relay – transformer coil of which is connected to source of direct voltage through closing (front) contact of limit relay of stage throttle point. |
