RU2724143C1 - Device for prohibition of automatic repeated switching-on of double-track road ac catenary system circuit breaker - Google Patents

Abstract

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

Description

The invention relates to a system for automation of traction power supply of railways, and in particular to devices for automation of supply lines of a contact AC network.

The problem of monitoring a short circuit in a disconnected contact network was considered in [1-3]. A device for monitoring a short circuit in the contact AC network of a double-track railway section [4], taken as a prototype, contains: a signal device, 27.5 kV buses of a traction substation with a first switch connected to it with an opening block contact supplying contact network of the first railway track; a third switch supplying the two-wire-rail (DPR) line, a second switch with opening and closing block contacts connected to 27.5 kV buses and supplying the second-way contact network; two voltage relays; the primary winding of the transformer is connected at one end to the contact network, and at the other end to the rail, the coil of the first voltage relay is connected to the secondary winding of the transformer through the opening block contact of the first switch; the signal device is connected at one end to -110 V operating voltage, and at the other end to the first output of the make contact of the first voltage relay, the second voltage relay has an increased set point, its coil is connected in parallel with the coil of the first voltage relay, and the make contact with the first output is connected to the first the output of the make contact of the first voltage relay, and the second output is connected to +110 V of operating voltage through the make-up block contact of the second switch, the disconnect unit-contact of the second switch is connected at one end to the second output of the make contact of the first voltage relay, and the second end is connected to +110 In operational voltage

The disadvantages of the prototype device [4]: the possibility of a false prohibition of automatic reclosure when restoring the isolation of the traction network in dead time. The invention [4] solves the problem of determining a stable fault with different options for tripping circuit breakers, but does not take into account the possibility of restoring insulation to a dead time.

The purpose of the invention is to increase the reliability of determining a stable short circuit with the implementation of the AR prohibition function, taking into account the recovery time of the isolation of the traction network.

To achieve this goal, the second output closing contacts of the off-position relay repeater and the latching relay of the control command of the first switch, the time relay with the closing contact and the first and second intermediate relays with opening and closing contacts, respectively, are introduced into the device, and the second conclusions of the closing contacts of the first and the second voltage relay are connected to the first output of the coil of the first intermediate relay, the second output of which is connected to the “+” bus, and the second output closing contacts of the repeater relay and the latching relay are connected at one end to the “-” bus and the other to the first the output of the time relay coil, the second output of which is connected to the "+" bus, and in addition, the closing and opening contacts of the time relay and the first intermediate relay, respectively, are connected at one end to the "-" bus, and the other to the first output of the second intermediate coil relay, second vyvo for which it is connected to the “+” bus, and the make contact of the second intermediate relay is connected at one end to the “-” bus, and the other to the one-shot relay, parallel to the disconnect contact of the relay for fixing the control command of the first switch.

EFFECT: prohibition of repeated switching on in case of determination of a stable short circuit on double-track sections.

The scheme of the invention is shown in FIG. 1 and FIG. 2 (it is assumed that the induced voltage is controlled on the contact network of the first path), on which the following notation is introduced:

1 - tires 27.5 kV traction substation;

2 and 3 - the first and second switches for connecting the supply lines of the contact network, respectively, of the first and second ways;

4 - switch connecting the supply line of the DPR;

5 and 6 - supply lines of the contact network of the first and second paths, respectively;

7 - supply line DPR;

8 - voltage transformer monitoring induced voltage;

9 - opening block contact of the first switch (when the switch is off, the block contact is closed);

10 - coil of the first voltage relay with make contact 22;

11 - coil of the second voltage relay with make contact 23;

12 - electromagnetic effect of the DPR line on the contact network of the first path;

13 - electromagnetic effect of the contact network of the second path on the contact network of the first path;

14 - short circuit;

15 and 16 - make contacts of the relay-repeater of the disconnected position of the first switch connecting the supply line of the contact network;

17, 18 and 19 - the closing and opening contacts of the relay for fixing the control command for the first switch connecting the supply line of the contact network, respectively;

20 and 21 - opening and closing block contacts of the second switch connecting the supply line of the contact network, respectively (when the switch is disconnected, the opening block contact is closed);

24 - time relay coil with make contact 25;

26 - coil of the first intermediate relay with NC contact 27;

28 - coil of the second intermediate relay with a make contact 29;

30 - device re-enable RPV-58;

31 - electromagnet turning on the switch;

32 - AR device of the first switch connecting the supply line of the contact network.

The scheme works as follows.

After an emergency shutdown of the second switch of the supply line of the contact network (feeder), the time relay power circuit (24) is assembled, the time relay exposure is selected less than the time setting of the automatic reclosure device (32) of the feeder (for example, less by 0.5 s). The closing contact of the time relay (25) is connected in series to the coil circuit of the second intermediate relay (28), the closing contact (29) of which is connected to the AR lock circuit (32). When the induced voltage is fixed less than the voltage relay setting (first (10) or second (11)), the power circuit of the first intermediate relay (26) is assembled, either through the make contact (22) of the first voltage relay or through the make contact (23) of the second voltage relay , depending on the state of the second switch (3). During the time delay of the time relay (24), the device waits for restoration of insulation, and only if the measured induced voltage is still less than the voltage relay setting (10) or (11), it will prohibit automatic restart through the automatic reclosure lock by closing the contact (29). In the event that the insulation is restored, the reclosing will be allowed, since in this case the contact (29) will remain open.

Consider several cases with short circuit on the contact network 5 of the first path.

1 case. Long-term stable short circuit. When short circuit breakers 2 and 3 are turned off. Voltage is applied to the time relay 24, the countdown has begun. The electromagnetic effect will be determined only by the line of the DPR 7, i.e. electrical influence, which will not exceed 200 V in the presence of a short circuit. When the switch 2 is turned off, the opening block contact 9 will be closed and the induced voltage will be supplied to the coil of the first voltage relay 10 (we will not consider the second voltage relay, since the block contact 21 of the second switch is open). The setting of the first voltage relay is 300 V, and the induced voltage is less than 300 V. Therefore, the first relay voltage with coil 10 remains inoperative (terminal 22 open), the intermediate relay 26 will also be disconnected, the opening contact 27 will remain closed, which will trigger the second intermediate relay 28 after a time equal to the exposure time relay, make contact 29 will collect the automatic reclosure lock circuit, there will be no re-inclusion.

2 case. There is no sustainable short circuit. In short circuit, only switch 2 is turned off. The power circuit of the time relay 24 is assembled, the countdown has begun. The electromagnetic effect is determined by the line 7 of the DPR and the contact network 6 of the second path, in this case, the induced voltage in the absence of a short circuit exceeds 3 kV. When the switch 2 is turned off, the opening block contact 9 will be closed and the induced voltage will be supplied to the coil of the second voltage relay 11 (we will not consider the first voltage relay, since the block contact 20 of the second switch is open). The setting of the second voltage relay is 500 V, and the induced voltage is more than 500

8. Therefore, the second relay voltage with coil 11 is activated (contact 23 is closed) and when the block contact 21 of the second switch 3 is closed, voltage will be applied to the intermediate relay 26, the contact of which 27 will open, and if the induced voltage does not decrease after a time equal to the exposure time below the setting, the second intermediate relay 28 will remain disconnected, its contact 29 will remain open, thereby allowing re-inclusion.

3 case. Long-term stable short circuit. In short circuit, only switch 2 is turned off. The power circuit of the time relay 24 is assembled, the countdown has begun. The electromagnetic effect is determined by the line 7 of the DPR and the contact network 6 of the second path, in this case, the induced voltage in the presence of a short circuit does not exceed 400 V. When the switch 2 is turned off, the opening block contact 9 will be closed and the induced voltage will be applied to the coil of the second voltage relay 11 (the first we do not consider the voltage relay, because the contact block 20 is open). The setting of the second voltage relay is 500 V (the increased setting of the second voltage relay takes into account the additional electric and magnetic influence of the adjacent path on the induced voltage), and the induced voltage is less than 500 V. Therefore, the second voltage relay with coil 11 remains in an unused state (contact 23 open) intermediate relay 26 will be disconnected. Further, everything is the same as in case 1 - prohibition of AR.

4 case. The fault was stable, but the insulation was restored during the time period of the time relay (24) of the device. Everything happens in the same way as 1 or 2 cases, but by the time the contact of the time relay 25 closes, contact 27 opens (the induced voltage is higher than the settings of the first or second voltage relay and the first intermediate relay turned off due to opening contact 22 or 23), respectively, the second intermediate the relay (28) also turns off and pin 29 remains open, thereby allowing automatic reclosure.

The effectiveness of the device is determined by the reduction in the number of burns and the amount of damage to the contact suspension in the case of a stable short circuit, and the reduction in false prohibitions of automatic reclosure during restoration of isolation of the traction network.

Sources of information

1. German L.A., Popov A.Yu. Quickly determine the damage zone in a disconnected contact network. Locomotive No. 12 - 2011.

2. Patent for invention No. 2397502 dated April 29, 2009. A control device for a passing and stable short circuit in a contact AC network (German L.A., German V.L.).

3. German L.A., Demidov S.V., Popov D.S., Yakunin D.V. A simple way to look for damage on a contact AC network. Lokomotiv, 2008. - No. 4, p. 45-46.

4. Patent for the invention No. 2531025 from 09/07/2012. Short-circuit monitoring device in the AC contact network of a two-track railway section. (German L.A., German V.L., Zhevlakov D.A., Popov A.Yu.). Publ. 10.20.2014 Bull. No. 29.

Claims (1)

A device for prohibiting automatic restarting of a circuit breaker in a contact path of an alternating current of a two-track section, containing busbars of 27.5 kV of a traction substation with a first switch connected to them, supplying a contact network of the first railway track and equipped with an automatic reclosure device with a circuit connected to "+" and " - "to the operational voltage busbars, from a single re-enable relay connected to the first output closing contacts of the off-position repeater relay and the latching relay of the control command of the circuit breaker, with the opening contact of the latching relay of the control command of the circuit breaker and the circuit-breaker electromagnet, second and third circuit breakers, supplying the contact network of the second railway path and the “two wires-rail” line (DPR), respectively, also connected to 27.5 kV buses, a voltage measuring transformer connected by the primary winding to the first switch on the side of the contact network connected to its secondary winding by two coils of the voltage relay through the opening block contact of the first circuit breaker, and the closing contacts of the first and second voltage relay with the first terminals connected to the "-" bus operating voltage through the opening and closing block contacts of the second switch, respectively, characterized in that they are introduced in series connected second output closing contacts of the relay of the off-position repeater and a relay for fixing control commands of the first switch, a time relay with a closing contact, and first and second intermediate relays with opening and closing contacts, respectively, the second conclusions of the closing contacts of the first and second voltage relays connected to the first output the coils of the first intermediate relay, the second output of which is connected to the “+” bus, and the second output closing contacts of the repeater relay and the latching relay are connected in series at one end to the “-” bus and the other to the first output of the time relay coil, the swarm terminal of which is connected to the "+" bus, and, in addition, the serially and disconnecting contacts of the time relay and the first intermediate relay, respectively, are connected at one end to the "-" bus and the other to the first terminal output of the second intermediate relay coil, the second terminal of which is connected to the "+" bus, and the make contact of the second intermediate relay is connected at one end to the "-" bus, and the other to the one-shot relay in parallel with the disconnect contact of the relay for fixing the control command of the first switch.

Images