SU1426872A1 - Arrangement for traction network protection - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for e-B01 types of electric networks of electrified railroads against short circuits. The purpose of the invention is to increase the reliability of the potential protection and the electric network. The device contains a voltage relay, a transmitting part consisting of a high-frequency signal transmitter connected through the first matching unit to the first power line and including the first two-frequency oscillator with a manipulator and the first power supply unit, the receiving part consisting of the first high-frequency signal receiver connected to the first power line and having alarm and emergency outputs, an alarm and control unit of a high-voltage switch having on and off circuits, W swarm transmitter with matching block and the second high-frequency signal receiver connected to the second power line. Moreover, the matching unit of the first and second transmitters of the transmitting part is provided with a choke and a capacitor and is made in the form of a transformer with a primary winding connected to the phases of the corresponding transmission line, to the secondary winding of which the power supply unit and the first output capacitor are connected to the secondary winding. the circuit of a double-frequency capacitor, made in the form of a self-oscillating system with inductive coupling, the second output circuit of which is connected in series with the second input circuit of the dual-frequency generator of another transmitter. Two pairs of switching contacts of the voltage relay were used as manipulators of both generators. The signaling and control unit of the receiving part is equipped with three logical OR cells, an OR-NOT logical cell, a trigger, a time outflow block and a BAN logical cell, and two signaling devices, with the inputs of the first and second logical OR cells connected to the alarm and alarm outputs of the first and second receivers high-frequency signals, the output of the first cell OR is connected to the first signal device and the first input of the logical cell OR NOT, the output of the second logical cell OR the connection en to the second signal device and the second input of the logical cell OR NOT, the output of the latter is connected to one of the inputs of the third logical cell OR, the second and the third inputs of which are connected to the alarm outputs of the first and second high-frequency signal receivers, respectively, and 4 you are O) 00 P1 Is:

Description

the output is connected to the first input of the logical cell BANGE connected to the disconnecting circuit of the high-voltage switch, the second input of the logical 1 cell ZAPRBrT and the input of the holding unit

time connected to the trigger output, one input of which is connected in parallel to the switching circuit of the high voltage switch, and the other to the output of the time delay block. 2 Il.

one

The invention relates to devices for the transmission of relay protection signals over wires of power lines of electrified railways.

The purpose of the invention is to increase the reliability of the device.

FIG. I shows the block diagram of the proposed device, the transmitting part; Fig, 2 - the same, the receiving part.

The device contains two transmitters 1 and 2 high-frequency signals connected to two lines of electrical transmissions 3 and 4 via matching transformers 5.

The first transmitter is high frequency. Signals 1 includes a two-frequency generator with two frequency-setting elements 6, 7 and a switch 8 connected to the power supply unit 9 through a resistor 10 and a transformer of the high-frequency generator 11 with four circuits of inductive coupling. Two circuits are connected in series through resistors 10 and 12, frequency-generating elements 6 and 7, transistor 13,

The third circuit is connected to a similar circuit in transmitter 2, and the fourth circuit is connected to matching transformer 5 through a capacitor 14. In parallel, via a power supply unit 9, a matching throttle 15 is connected to the fourth circuit. The second transmitter is similarly structured.

The control of the connector 8 is carried out from the voltage relay 16 connected between the contact wire 17 and the rail 18 via the resistance 19,

FIG. 2 is a diagram of the receiving part of the device,

Receivers of high-frequency signals 20 and 21 are connected to power lines.

five

five

0

0 5

ABOUT

45

five

Reducers 3 and 4. The first logical cell OR 22 is connected to the receiver 20, and the second logical cell OR 23 is connected to another receiver 21, and the inputs of these cells are connected to the signal and emergency outputs of the receivers, respectively 20 and 21, the codes of these cells OR are connected respectively to the first 24 and second 25 signal devices and simultaneously to the two inputs of the OR OR NOT 26 logical cell, the emergency outputs of the receivers 20 and 21, and the output of the logic cell 26 are connected to the third logical cell OR 27. The output of the logic cell 27 is connected to the right the input of the logical cell BANGE 28 and the output of the latter controls the tripping circuit of the high voltage switch 29, the contactor 30 controls the switching circuit of the high voltage circuit breaker 29 and is simultaneously connected to one of the inputs of the trigger 31, the output of which is connected to the inverse of the BAN cell 28 and the exposure element input time 32, the output of the latter is connected to the second input of the trigger 31.

The device works as follows

In the normal operation mode, if the operating voltage of the relay 16 in the contact wire 17 (FIG. 1) of the contacts of the switch 1B includes the frequency control element 7 of the transmitter 1, this transmitter receives power from the line 3 through the transformer 5, the choke 15 and the power supply unit 9, the Transmitter generates signal with a frequency corresponding to the normal mode. This signal through the capacitor 14 and the transformer 5 enters the transmission line 3 and is transmitted to the substation. The transmitter 2 works in the same way via the power line 4. Since the second output circuits of the transmitter 1 and 2 are connected in series, both transmitters generate signals of the same frequency.

Along lines 3 and 4 (Fig. 2), the signal with a frequency corresponding to the normal mode enters receivers 20 and 21 and, through their signal outputs and logic cells 22 and 23, goes to signaling devices 24 and 25, respectively.

I

In the short circuit mode on the contact network 17 (Fig. 1), the relay 16 turns on the frequency control element 6 of transmitters 1 and 2. These transmitters, operating at the same frequency, send alarms to lines 3 and 4. In lines 3 and 4 (Fig. 2), signals with a frequency corresponding to the emergency mode are fed to the emergency exits of receivers 20 and 21 and to the inputs of the logic cell OR 27. Lastly, through the open cell, BAN 28 acts on the high-voltage circuit breaker 30.

When the switch 29 is disconnected (Fig. 2), the voltage in the contact wire 17 (Fig. 0.No. Therefore, transmitters I and 2 send signals to lines 3 and 4 corresponding to the emergency mode. To turn off the off switch 29 (Fig. 2) the contactor 30 is closed, which transfers the flip-flop 31 for the time determined by the time delay element 32. At the same time, the BAN 28 element closes, not passing a disconnect signal to the trip circuit 27.

Claims (1)

Invention Formula A device for protection of the traction network, comprising a transmitter consisting of a multi-frequency high-frequency generator with a control relay and frequency-building circuits and a matching unit, a transmission line and a receiver, different 0 in order to ensure reliability, it is equipped with an additional high-frequency transmitter with an additional matching unit connected to the standby power line, each with a matching unit of both high-frequency transmitters. It consists of a transformer, the primary winding of which is connected to the power line, and the secondary through a capacitor - to one output of the multi-frequency generator, and the other outputs of the generators of each high-frequency transmitter are combined, and the receiver contains the elements OR, SHSh5 NO, BANNER, time element, trigger , one input of which is connected with the switching device switching element, and the other with the output of a time element, the input of which is combined with the output 0 triggers and one output of the BANNER element, the other input of which is connected to the output of one OR element, one input of which is connected to the output of the OR-NOT element, whose inputs are connected to the outputs of the second and third OR elements, and the other two inputs of the first OR element, and one inputs of the second and third OR elements are connected to the first outputs of the main and auxiliary receivers, the other two outputs of each receiver are connected to other inputs of the second and third OR elements. compiler L.Reznikova Editor N.Gorvat Tehred A.Kravchuk kcetiotklyu- Ch1ni g Fig2 Proofreader M.Maksimishinets