A computer interlocking controlled three-phase AC turnout control circuit

Abstract

The application relates to a computer interlocking control three-phase alternating current turnout control circuit, belonging to the technical field of rail transit signal control; a computer interlocking control three-phase alternating current turnout control circuit, wherein the contact of 2DQJF is connected to the 3-4 coil excitation circuit, turnout indication circuit and turnout action circuit of 1DQJ; the circuit can only make DBJ / FBJ excitation be lifted when the position states of 2DQJF and 2DQJ are consistent; meanwhile, the circuit prevents the hidden danger risk that the 3-4 coil excitation circuit of 1DQJ cannot be timely disconnected when 2DQJF cannot normally switch the polarity due to reasons in the turnout conversion process of the prior art; the circuit also controls the driving of the related relays according to the driving information of the turnout interface circuit of the computer interlocking system and gives related alarm information, thereby preventing the risks of turnout false action and turnout false indication due to reasons such as wrong construction, missed detection and missed repair of signal personnel.

Description

Technical Field

[0001] This application relates to the field of rail transit signal control technology, and in particular to a computer interlocking control circuit for a three-phase AC turnout. Background Technology

[0002] In recent years, with the construction and development of high-speed railways in my country, the operating mileage of railways has increased rapidly. Multi-locomotive traction turnouts have been widely used on various passenger dedicated lines and high-speed railways. Railway transportation has placed stricter requirements on the safety of turnout switching equipment, making the rigor, rationality, and safety of turnout control circuits in engineering design particularly important. By monitoring the position status of 2DQJ after the turnout is moved (either in the raised or lowered position), the operator's action of moving the turnout to the correct position (or to the reverse position) can be reflected. Therefore, monitoring the position status of 2DQJ can meet the monitoring requirements for the switching direction of the switch machine in the "Technical Conditions for Centralized Monitoring Systems of Railway Signals". Several railway bureaus (group companies), considering their own safety production, have issued documents requiring design institutes to add monitoring of the 2DQJ position status in the transfer combination. In the three-phase AC turnout control circuit, the 2DQJ contacts are often fully utilized. To monitor the status of the 2DQJ, the design institute modified the original standard circuit (the original standard circuit did not contain 2DQJF, but the modified circuit added 2DQJF). The third set of 2DQJ contacts was connected to the 2DQJF control circuit, and the fourth set of 2DQJ contacts in the original standard circuit was used to replace the fourth set of 2DQJ contacts in the 1DQJ 3-4 coil excitation circuit. The centralized signal monitoring system reflects the position status of the 2DQJ by collecting the position status of the third set of 2DQJF contacts, but the rationality and safety of the circuit design were ignored. The main problems are as follows: (1) The fourth group of contacts of 2DQJF controls the on / off of the excitation circuit of the 3-4 coil of 1DQJ. If 2DQJF cannot switch poles normally during the turnout switching process, the excitation circuit of the 3-4 coil of 1DQJ cannot be disconnected in time, which will cause the phase loss protection circuit composed of the 1-2 coils of 1DQJ to fail. The failure of the phase loss protection circuit will cause the switch machine motor to fail to disconnect the circuit in time when there is a phase loss, which may burn out the switch machine motor. (2) If 2DQJF cannot switch poles normally during the turnout switching process, the 3-4 coil circuit of 1DQJ will not be disconnected after the turnout is switched to the position, and the starting circuit cannot be automatically cut off. After the turnout is switched to the position, the inability to automatically cut off the starting circuit will cause the turnout rectifier element to be subjected to a high voltage of about 380V for a long time, which may cause the turnout rectifier element to overheat and burn out. Even worse, if the turnout rectifier element is short-circuited, it may burn out the switch machine motor. (3) For multi-motor traction turnouts, if 2DQJF fails to switch poles normally in the split-action combination, the motor circuit will fail and the turnout will not be able to stop switching. (The excitation circuit of the 3-4 coil of 1DQJ in the split-action combination is not affected by the total protection circuit of the multi-motor traction turnout. If 2DQJF fails to switch poles in any split-action combination, the excitation circuit of the 3-4 coil of 1DQJ cannot be cut off for a long time, and 1DQJ will continue to be attracted).(4) The "Interim Measures for Railway Signal Interlocking Tests" stipulates that for multi-motor traction externally locked turnouts, the positions of the outdoor traction points and the corresponding indoor sub-traction combinations, sub-traction combinations and the main combination relays, as well as the corresponding 2DQJ and 2DQJF positions, must be consistent. However, in practice, when the positions of the outdoor traction points and the corresponding indoor sub-traction combinations, sub-traction combinations and the main combination relays, as well as the corresponding 2DQJ and 2DQJF positions are inconsistent, the turnout indication can still be given (when the positions of 2DQJ and 2DQJF are inconsistent, even removing 2DQJF will not affect the turnout indication).

[0003] In 2020, a railway bureau (group company) organized a safety inspection of the 1DQJ turnout excitation circuit in accordance with the safety inspection plan of the China State Railway Group. During the inspection, it was found that due to incorrect construction, omissions in inspection and maintenance by signal personnel, KZ current was mistakenly mixed into the 3 coil of 1DQJ. There was a risk that control negative current (KF) could be further mixed into the 4 coil of 1DQJ, or that the turnout might malfunction when the turnout was operated (by bypassing the track clearance inspection conditions in the turnout section).

[0004] In 2023, a railway bureau (group company) organized a hidden danger investigation of turnout interlocking circuits. During the investigation, it was found that due to incorrect construction, missed inspection and maintenance by signal personnel, the series circuit switch of the back contact of the fixed and reverse meter relays failed to collect the switch quantity. There was a risk that when the turnout was in the four-way position, the switch quantity of the front contact of the fixed or reverse meter relay was mixed with the positive voltage (IOZ) collected, which could cause false turnout indication. Summary of the Invention

[0005] To overcome the above problems, embodiments of the present invention provide a computer-interlocked three-phase AC turnout control circuit.

[0006] A computer-interlocked three-phase AC turnout control circuit, the circuit comprising a turnout relay logic control circuit, a turnout operation circuit, and a turnout indication circuit, wherein:

[0007] The logic control circuit for the turnout relay includes a starting relay 1DQJ, a starting repeater relay 1DQJF, a second starting relay 2DQJ, a second starting repeater relay 2DQJF, a protection relay BHJ, a positioning control relay DCJ, a reverse position control relay FCJ, and a locking relay SFJ; the 3-4 coil excitation circuit of the first starting relay 1DQJ contains a set of rear / front contacts and a middle contact of the second starting repeater relay 2DQJF.

[0008] The turnout operating circuit includes a three-phase AC power supply (A, B, C), three three-phase transmission lines, and three coil windings of the switch machine motor. The three coil windings of the switch machine motor are respectively a first coil winding (a), a second coil winding (b), and a third coil winding (c). The three three-phase transmission lines are respectively a first three-phase transmission line S1, a second three-phase transmission line S2, and a third three-phase transmission line S3. The three-phase AC power supply (A, B, C) is output to the first coil winding (a), the second coil winding (b), and the third coil winding (c) / the third coil winding (c) and the second coil winding (b) of the switch machine motor through the first three-phase transmission line S1, the second three-phase transmission line S2, and the third three-phase transmission line S3, respectively, to control the switch machine motor to switch between the positioning and reverse positions. The second three-phase transmission line S2 and the third three-phase transmission line S3 contain, partially or entirely, a set of rear / front contacts and a middle contact of the two-start repeater relay 2DQJF.

[0009] The turnout indication circuit includes a power supply branch, an indication relay branch, and a rectifier branch; the indication relay branch is connected in series with the power supply branch, and the rectifier branch is connected in parallel with the indication relay branch; the indication relay branch includes coils 1-4 of the positioning indication relay DBJ / reverse indication relay FBJ and the third coil winding c; the power supply branch includes the secondary coil of the indication transformer BD1-7, the protection resistor element R1, and the first coil winding a; the rectifier branch includes the rectifier diode element Z, the resistor element R, and the second coil winding b; the power supply branch and the rectifier branch contain, partially or entirely, a set of rear / front contacts and a middle contact of the two-start relay 2DQJ / two-start repeating relay 2DQJF.

[0010] Preferably, the second three-phase transmission line S2 and the third three-phase transmission line S3 contain part or all of a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF, including the second three-phase transmission line S2 and the third three-phase transmission line S3 containing a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF.

[0011] Preferably, in the computer interlocking control three-phase AC turnout control circuit, the statement indicating that the power supply branch and rectifier branch partially or entirely contain a set of rear / front contacts and middle contacts of the two-start relay 2DQJ / two-start repeater relay 2DQJF includes the statement indicating that the power supply branch contains a set of rear / front contacts and middle contacts of the two-start relay 2DQJ, and the rectifier branch contains a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF.

[0012] More preferably, the computer-interlocked three-phase AC turnout control circuit described above...

[0013] The excitation circuit of coils 3-4 of the starting relay 1DQJ contains a set of rear / front contacts and a middle contact of the two starting repeater relays 2DQJF, and a set of front contacts and a middle contact of the positioning control relay DCJ / reverse control relay FCJ; the excitation circuit of coils 1-4 of the starting repeater relay 1DQJF contains a set of front contacts and a middle contact of the starting relay 1DQJ; the excitation circuit of coils 1-2 / 3-4 of the two starting relays 2DQJ contains a set of front contacts and a middle contact of the starting repeater relay 1DQJF. The DQJF has a set of front and middle contacts, and the DCJ / FCJ has a set of front and middle contacts. The excitation circuit of the 1-2 / 3-4 coils of the dual start repeater relay 2DQJF contains a set of rear / front and middle contacts of the dual starter relay 2DQJ. The excitation circuit of the 1-2 coil of the single starter relay 1DQJ contains a set of front and middle contacts of the single starter relay 1DQJ itself, and a set of front and middle contacts of the protection relay BHJ.

[0014] The first three-phase transmission line includes a first AC input / output terminal of a phase loss protector DBQ, and a set of front and middle contacts of a starting relay 1DQJ; the second three-phase transmission line includes a second AC input / output terminal of the phase loss protector DBQ, a set of front and middle contacts of a starting repeater relay 1DQJF, and a set of rear / front and middle contacts of a starting repeater relay 2DQJF; the third three-phase transmission line includes a third AC input / output terminal of the phase loss protector DBQ, a set of front and middle contacts of a starting repeater relay 1DQJF, and a set of rear / front and middle contacts of a starting repeater relay 2DQJF; the 1-4 coils of the protection relay BHJ are connected to the DC output terminal of the phase loss protector DBQ;

[0015] The power supply branch also includes two sets of rear contacts and a middle contact of the first starting relay 1DQJ, and one set of rear / front contacts and a middle contact of the second starting relay 2DQJ; the indicator relay branch also includes contacts of the automatic switch machine switch; the rectifier branch also includes one set of rear contacts and a middle contact of the first starting repeater relay 1DQJF, one set of rear / front contacts and a middle contact of the second starting repeater relay 2DQJF, and contacts of the automatic switch machine switch.

[0016] Preferably, in the computer-interlocked three-phase AC turnout control circuit, the energizing and energizing of the positioning control relay DCJ / reverse control relay FCJ and the locking and anti-locking relay SFJ is driven by the computer interlocking system; the timing of the computer interlocking system driving the positioning control relay DCJ / reverse control relay FCJ and the locking and anti-locking relay SFJ is asynchronous, specifically:

[0017] When performing positioning control, the positioning control relay DCJ is driven first. After a first preset time t1, the system selects whether to drive the locking relay SFJ. If the computer interlocking system detects a change in the switch state of the front contact of the positioning indicator relay DBJ from 1 to 0 before the first preset time t1, the computer interlocking system issues an alarm and stops driving the positioning control relay DCJ and the locking relay SFJ, locking the turnout. If the computer interlocking system does not detect a change in the switch state of the front contact of the positioning indicator relay DBJ from 1 to 0 before the first preset time t1, the computer interlocking system continues to drive the locking relay SFJ.

[0018] When operating in the reverse position, the reverse position operation relay FCJ is driven first. After a first preset time t1, the system selects whether to drive the locking relay SFJ. If the computer interlocking system detects a change in the switching state of the front contact of the reverse position indicator relay FBJ from 1 to 0 before the first preset time t1, the computer interlocking system issues an alarm and stops driving the reverse position operation relay FCJ and the locking relay SFJ, locking the turnout. If the computer interlocking system does not detect a change in the switching state of the front contact of the reverse position indicator relay FBJ from 1 to 0 before the first preset time t1, the computer interlocking system continues to drive the locking relay SFJ. The first preset time t1 is no greater than 3 seconds.

[0019] More preferably, in the computer interlocking control circuit for three-phase AC turnouts, if the computer interlocking system does not collect the change of the switch state of the front contact of the anti-locking relay SFJ from 0 to 1 before the second preset time t2 is reached, the computer interlocking system will issue an alarm for inconsistent acquisition of the anti-locking relay SFJ drive.

[0020] If the computer interlocking system detects a change in the switch state of the front contact of the anti-locking relay SFJ from 0 to 1 before the second preset time t2 is reached, and detects a change in the switch state of the front contact of the positioning relay DBJ from 1 to 0 / the switch state of the front contact of the reverse positioning relay FBJ from 1 to 0 before the third preset time t3 is reached, but does not detect a change in the series switch state of the rear contacts of the positioning relay DBJ and the reverse positioning relay FBJ from 0 to 1, then the computer interlocking system will issue an alarm and block the turnout.

[0021] If the switch status of the front contact of the positioning relay DBJ / reverse positioning relay FBJ changes from 0 to 1 before the fourth preset time t4 is reached, the computer interlocking system will issue a turnout no-indication alarm.

[0022] The second preset time t2 < the third preset time t3 < the fourth preset time t4, and the third preset time t3 is not greater than 4 seconds.

[0023] Beneficial effects:

[0024] The computer-interlocked three-phase AC turnout control circuit provided in this embodiment of the invention incorporates the consistency check of the position states of relays 2DQJ and 2DQJF in the transfer combination into the turnout indication circuit. Turnout indication (position indication or reverse position indication) can only be given when the position states of relays 2DQJ and 2DQJF in the transfer combination are consistent. In this way, when checking the turnout position during the turnout single-phase interlocking relationship test, the position relationship can be determined to be unique (turnout indication can only be given when the position of each traction point outdoors is consistent with the corresponding position of each transfer combination indoors, the position of the transfer combination and the position of the main combination indicating relay, and the corresponding positions of 2DQJ and 2DQJF).

[0025] The present invention provides a computer-interlocked three-phase AC multi-motor traction turnout control circuit. In the split-operation combination, the fourth group of contacts of 2DQJF controls the on / off of the excitation circuit of the 3-4 coil of 1DQJ. In the split-operation combination, only after the 2DQJF relay turns off the pole and disconnects the excitation circuit of the 3-4 coil of 1DQJ can the three-phase AC power be output to the three-phase motor of the switch machine to realize the turnout position conversion. This avoids the following risks of the prior art: (1) When 2DQJF fails to turn off the pole normally during the turnout conversion process, the excitation circuit of the 3-4 coil of 1DQJ cannot be disconnected in time, which will cause the phase loss protection circuit composed of the 1-2 coils of 1DQJ to fail. (2) When 2DQJF fails to turn off the pole normally during the turnout conversion process, the 3-4 coil circuit of 1DQJ is not disconnected after the turnout is in place, which will prevent the automatic disconnection of the starting circuit. (3) For multi-motor traction turnouts, if 2DQJF fails to switch poles normally in a split-action combination, the motor circuit will malfunction and the turnout will not be able to stop switching (the excitation circuit of coils 3-4 of 1DQJ is not affected by the total protection circuit of the multi-motor traction turnout. If 2DQJF fails to switch poles in any split-action combination, the excitation circuit of coils 3-4 of 1DQJ cannot be cut off for a long time, and 1DQJ will continue to be pulled up). (4) Due to incorrect construction, missed inspection and maintenance by signal personnel, etc., KZ electricity may be mistakenly mixed into coil 3 of 1DQJ, and there is a risk that control negative electricity (KF) may be further mixed into coil 4 of 1DQJ or that the turnout may malfunction when the turnout is operated (by abandoning the track clearance inspection condition of the turnout section). (5) Due to errors in construction, omissions in inspection and repair by signal personnel, the series circuit switch of the back contact of the fixed and reverse relays may fail to collect the switch quantity. There is a risk that the switch quantity of the front contact of the fixed or reverse relay may be mixed with the positive voltage (IOZ) when the turnout is in the four-open position, resulting in a false turnout indication. Attached Figure Description

[0026] Figure 1A schematic diagram of a computer-controlled interlocking relay logic control circuit for turnouts, which is used in the prior art.

[0027] Figure 2 A schematic diagram of a computer-controlled three-phase AC turnout operating circuit and indication circuit, which is used in the prior art.

[0028] Figure 3 The current curve of the turnout operating when the pole is not reversed in the existing 2DQJF technology;

[0029] Figure 4 A schematic diagram of a computer-controlled interlocking turnout relay logic control circuit is provided for an embodiment of the present invention.

[0030] Figure 5 A schematic diagram of a computer-interlocked three-phase AC turnout operating circuit is provided for an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of the turnout indication circuit structure provided in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of a computer-controlled three-phase AC turnout operating circuit and indication circuit is provided for an embodiment of the present invention;

[0033] Figure 8 The prior art provides a computer interlocking control circuit diagram for the turnout interface section of a three-phase AC turnout control circuit;

[0034] Figure 9 This invention provides a schematic diagram of a computer-controlled three-phase AC turnout control circuit interlocking system with alarm function. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "containing," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] In the three-phase AC turnout control circuit, the 2DQJ contacts are often fully utilized. To monitor the 2DQJ status, the design institute modified the original standard circuit (the original circuit did not include 2DQJF, but the modified circuit added 2DQJF). The third set of 2DQJ contacts was connected to the 2DQJF control circuit, and the fourth set of 2DQJ contacts replaced the fourth set of 2DQJ contacts in the original standard circuit, connecting to the 3-4 coil excitation circuit of the 1DQJ. The centralized signal monitoring system reflects the 2DQJ position status by collecting the position status of the third set of 2DQJF contacts. Please refer to [link to relevant documentation]. Figure 1 , Figure 2 and Figure 3 ,like Figure 1 The diagram shown is a schematic of a computer interlocking control circuit for a turnout relay. Figure 2 A schematic diagram of a computer-controlled three-phase AC turnout operating circuit and indication circuit, which is used in the prior art. Figure 3 The current curve of the turnout when the 2DQJF pole is not rotated in the existing split-action combination;

[0038] Figure 1 The turnout relay logic control circuit shown includes a logic control circuit for a starting relay 1DQJ, a logic control circuit for a starting repeater relay 1DQJF, a logic control circuit for a second starting relay 2DQJ, a logic control circuit for a second starting repeater relay 2DQJF, a logic control circuit for a protection relay BHJ, a logic control circuit for a positioning control relay DCJ, a logic control circuit for a reverse position control relay FCJ, and a logic control circuit for a locking and anti-locking relay SFJ. The 2DQJF relay is connected to the 3-4 coil excitation circuit of the 1DQJ (the 3-4 coil excitation circuit of the 1DQJ contains a set of rear / front contacts and a middle contact of the 2DQJF relay). The fourth set of contacts of the 2DQJF can control the on / off state of the 3-4 coil excitation circuit of the 1DQJ.

[0039] Figure 2The schematic diagram of a computer-interlocked three-phase AC turnout operation and indication circuit shows that the contact of 2DQJ is connected to both the turnout indication circuit and the turnout operation circuit, while the contact of 2DQJF is not connected. This results in the state of the turnout indication circuit being related to the position state of 2DQJ but not to the position state of 2DQJF. Furthermore, if 2DQJF fails to rotate normally during turnout operation, the excitation circuit of coils 3-4 of 1DQJ cannot be disconnected in time. RD1, RD2, and RD3 are three starting fuses (air circuit breakers). In the AC switch machine, contacts 11, 12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26, 31, 32, 33, 34, 35, 36, 41, 42, 43, 44, 45, and 46 are automatic switch contacts, and K1 and K2 are safety contacts.

[0040] like Figure 3 The figure shows the turnout operating current curve when the 2DQJF pole is not rotated in the existing technology transfer combination. Figure 1 and Figure 2 The circuit shown illustrates the turnout operating current curve when 2DQJF is not rotating. The operating current curve during a fault indicates a very long "small step" (approximately twenty seconds). This is because the fourth set of contacts of the 2DQJF relay is connected in the excitation circuit of the 3-4 coils of the 1DQJ relay in the transfer case assembly. Figure 1 and Figure 2The circuit diagram shows that when the interlocking conditions are met and the turnout is operated or the route is arranged, the excitation circuit of coils 3-4 of 1DQJ is activated. At this time, 1DQJ is energized and then 1DQJF is energized and then 2DQJ reverses its pole, outputting three-phase starting power to the outdoor switch machine motor through the cable. During this process, the excitation circuit of coils 3-4 of 1DQJ can only be disconnected after 2DQJF reverses its pole. However, if the 2DQJF relay fails to reverse its pole for any reason, the excitation circuit of coils 3-4 of 1DQJ cannot be disconnected in time, and the excitation circuit of coils 3-4 of 1DQJ will remain activated until the computer interlocking system drives DCJ / FC. The excitation circuit of coils 3-4 of 1DQJ can only be disconnected after J and SFJ stop. The computer interlocking system drives DCJ / FCJ and SFJ for a maximum of 30 seconds, which is much longer than the normal switching time of the turnout (4 to 5 seconds). This means that the excitation circuit of coils 3-4 of 1DQJ cannot be disconnected after the turnout is switched to the correct position, so that 1DQJ can drop. Furthermore, because 1DQJ cannot drop for a long time after the turnout is switched to the correct position, the two-phase 380V starting voltage forms an AC circuit through the outdoor diode and the motor coil. Therefore, the "small step" curve of the turnout operating current curve is very long after the turnout is switched to the correct position. Although the BHJ, a disconnecting relay 1QDJ, and 1DQJ's own contacts are connected to the 1-2 coil self-closing circuit of 1DQJ in the transfer combination to form the 1DQJ 1-2 coil self-closing circuit check condition, 1DQJ is not controlled by the 1DQJ 1-2 coil self-closing circuit at this time (when the 1DQJ 1-2 coil self-closing circuit is disconnected, the 3-4 coil excitation circuit of 1DQJ continues to be connected, and 1DQJ can still be pulled up). At this time, the 1DQJ 1-2 coil self-closing circuit check condition formed by BHJ, 1QDJ, and 1DQJ's own contacts will not control 1DQJ to pull up and drop. The 1DQJ 3-4 coil excitation circuit will only be disconnected after the computer interlocking system drives DCJ / FCJ and SFJ to stop. After that, 1DQJ slowly drops down, disconnects the turnout starting circuit, and connects the turnout indication circuit. Therefore, if 2DQJF cannot switch poles normally after the turnout is operated, it does not affect the turnout switching and the turnout indication after the operation. The turnout will give the corresponding indication.

[0041] In summary, the existing technology neglects the rationality and safety of the circuit design. This is mainly reflected in the following aspects: (1) The fourth group of contacts of 2DQJF controls the on / off of the excitation circuit of the 3-4 coil of 1DQJ. If 2DQJF fails to switch poles normally during the turnout switching process, the excitation circuit of the 3-4 coil of 1DQJ cannot be disconnected in time, which will cause the phase loss protection circuit composed of the 1-2 coils of 1DQJ to fail. The failure of the phase loss protection circuit will prevent the switch machine motor from disconnecting the circuit in time when a phase is lost, which may burn out the switch machine motor. (2) If 2DQJF fails to switch poles normally during the turnout switching process, the 3-4 coil circuit of 1DQJ will not be disconnected after the turnout is switched to the correct position, and the starting circuit cannot be automatically cut off. After the turnout is switched to the correct position, the inability to automatically cut off the starting circuit will cause the turnout rectifier element to be subjected to a high voltage of about 380V for a long time, which may cause the turnout rectifier element to overheat and burn out. Even worse, if the turnout rectifier element is short-circuited, it may burn out the switch machine motor. (3) For multi-motor traction turnouts, if 2DQJF in the split-action combination fails to switch poles normally due to a fault, the motor circuit will fail and the turnout will not be able to stop switching (the excitation circuit of the 3-4 coil of 1DQJ in the split-action combination is not affected by the total protection circuit of the multi-motor traction turnout. If 2DQJF fails to switch poles in any split-action combination, the excitation circuit of the 3-4 coil of 1DQJ cannot be cut off for a long time, and 1DQJ will continue to be energized). (4) When the positions of the outdoor traction points and the corresponding indoor split-action combinations, split-action combinations and total combination indicate the relay positions, and the corresponding positions of 2DQJ and 2DQJF are inconsistent, the turnout indication can be given (when the positions of 2DQJ and 2DQJF are inconsistent, even if 2DQJF is pulled out, it will not affect the turnout indication).

[0042] A computer-interlocked three-phase AC turnout control circuit, the circuit including a turnout relay logic control circuit, a turnout operation circuit, and a turnout indication circuit.

[0043] Please see Figure 4 ,like Figure 4 The diagram shown is a schematic representation of a computer-controlled interlocking turnout relay logic control circuit according to an embodiment of the present invention.

[0044] The logic control circuit for the turnout relay includes a starting relay 1DQJ, a starting repeater relay 1DQJF, a second starting relay 2DQJ, a second starting repeater relay 2DQJF, a protection relay BHJ, a positioning control relay DCJ, a reverse position control relay FCJ, and a locking relay SFJ; the 3-4 coil excitation circuit of the first starting relay 1DQJ contains a set of rear / front contacts and a middle contact of the second starting repeater relay 2DQJF.

[0045] Please see Figure 5 ,like Figure 5The diagram shows a computer-interlocked control circuit diagram of a three-phase AC turnout operation circuit according to an embodiment of the present invention; wherein, (a) is a circuit diagram of the three-phase AC turnout reversing operation circuit, and (b) is a circuit diagram of the three-phase AC turnout positioning operation circuit.

[0046] The turnout operating circuit includes a three-phase AC power supply (A, B, C), three three-phase transmission lines, and three coil windings of the switch machine motor. The three coil windings of the switch machine motor are respectively a first coil winding (a), a second coil winding (b), and a third coil winding (c). The three three-phase transmission lines are respectively a first three-phase transmission line S1, a second three-phase transmission line S2, and a third three-phase transmission line S3. The three-phase AC power supply (A, B, C) is output to the first coil winding (a), the second coil winding (b), and the third coil winding (c) / the third coil winding (c) and the second coil winding (b) of the switch machine motor through the first three-phase transmission line S1, the second three-phase transmission line S2, and the third three-phase transmission line S3, respectively, to control the switch machine motor to switch between the positioning and reverse positions. The second three-phase transmission line S2 and the third three-phase transmission line S3 contain, partially or entirely, a set of rear / front contacts and a middle contact of the two-start repeater relay 2DQJF.

[0047] Please see Figure 6 ,like Figure 6 The diagram shows a schematic diagram of a turnout indication circuit provided in an embodiment of the present invention, wherein (a) is a schematic diagram of a turnout positioning indication circuit and (b) is a schematic diagram of a turnout reversal indication circuit.

[0048] The turnout indication circuit includes a power supply branch, an indication relay branch, and a rectifier branch; the indication relay branch is connected in series with the power supply branch, and the rectifier branch is connected in parallel with the indication relay branch; the indication relay branch includes coils 1-4 of the positioning indication relay DBJ / reverse indication relay FBJ and the third coil winding c; the power supply branch includes the secondary coil of the indication transformer BD1-7, the protection resistor element R1, and the first coil winding a; the rectifier branch includes the rectifier diode element Z, the resistor element R, and the second coil winding b; the power supply branch and the rectifier branch contain, partially or entirely, a set of rear / front contacts and a middle contact of the two-start relay 2DQJ / two-start repeating relay 2DQJF.

[0049] Preferably, the second three-phase transmission line S2 and the third three-phase transmission line S3 contain part or all of a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF, including the second three-phase transmission line S2 and the third three-phase transmission line S3 containing a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF.

[0050] Preferably, in the computer interlocking control three-phase AC turnout control circuit, the statement indicating that the power supply branch and rectifier branch partially or entirely contain a set of rear / front contacts and middle contacts of the two-start relay 2DQJ / two-start repeater relay 2DQJF includes the statement indicating that the power supply branch contains a set of rear / front contacts and middle contacts of the two-start relay 2DQJ, and the rectifier branch contains a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF.

[0051] More preferably, the computer-interlocked three-phase AC turnout control circuit described above...

[0052] The excitation circuit of coils 3-4 of the starting relay 1DQJ contains a set of rear / front contacts and a middle contact of the two starting repeater relays 2DQJF, and a set of front contacts and a middle contact of the positioning control relay DCJ / reverse control relay FCJ; the excitation circuit of coils 1-4 of the starting repeater relay 1DQJF contains a set of front contacts and a middle contact of the starting relay 1DQJ; the excitation circuit of coils 1-2 / 3-4 of the two starting relays 2DQJ contains a set of front contacts and a middle contact of the starting repeater relay 1DQJF. The DQJF has a set of front and middle contacts, and the DCJ / FCJ has a set of front and middle contacts. The excitation circuit of the 1-2 / 3-4 coils of the dual start repeater relay 2DQJF contains a set of rear / front and middle contacts of the dual starter relay 2DQJ. The excitation circuit of the 1-2 coil of the single starter relay 1DQJ contains a set of front and middle contacts of the single starter relay 1DQJ itself, and a set of front and middle contacts of the protection relay BHJ.

[0053] In the specific implementation process, you can refer to, for example, Figure 1 The prior art shown is implemented using a computer interlocking control circuit diagram of a turnout relay logic control circuit.

[0054] The first three-phase transmission line includes a first AC input / output terminal of a phase loss protector DBQ, and a set of front and middle contacts of a starting relay 1DQJ; the second three-phase transmission line includes a second AC input / output terminal of the phase loss protector DBQ, a set of front and middle contacts of a starting repeater relay 1DQJF, and a set of rear / front and middle contacts of a starting repeater relay 2DQJF; the third three-phase transmission line includes a third AC input / output terminal of the phase loss protector DBQ, a set of front and middle contacts of a starting repeater relay 1DQJF, and a set of rear / front and middle contacts of a starting repeater relay 2DQJF; the 1-4 coils of the protection relay BHJ are connected to the DC output terminal of the phase loss protector DBQ;

[0055] The power supply branch also includes two sets of rear contacts and a middle contact of the first starting relay 1DQJ, and one set of rear / front contacts and a middle contact of the second starting relay 2DQJ; the indicator relay branch also includes contacts of the automatic switch machine switch; the rectifier branch also includes one set of rear contacts and a middle contact of the first starting repeater relay 1DQJF, one set of rear / front contacts and a middle contact of the second starting repeater relay 2DQJF, and contacts of the automatic switch machine switch.

[0056] Please see Figure 7 ,like Figure 7 The diagram shows a computer-interlocked three-phase AC turnout operation circuit and indication circuit according to an embodiment of the present invention. The first three-phase transmission line includes the first AC input / output terminals (11 and 21 of DBQ) of a phase-loss protector DBQ, and a set of front and middle contacts (the first set of front and middle contacts of 1DQJ) of a starting relay 1DQJF. The second three-phase transmission line includes the second AC input / output terminals (31 and 41 of DBQ) of the phase-loss protector DBQ, a set of front and middle contacts (the first set of front and middle contacts of 1DQJF) of a starting repeater relay, and two starting repeater relays. The third three-phase transmission line includes the third AC input / output terminals (DBQ 51 and 61), a set of front and middle contacts (1DQJF 2) of a starting repeater relay 1DQJF, and a set of rear / front and middle contacts (2DQJF 2) of a second starting repeater relay 2DQJF; the coils 1-4 of the protection relay BHJ are connected to the DC output terminals (DBQ 1 and 2) of the phase loss protector DBQ.

[0057] The power supply branch also includes two sets of rear contacts and middle contacts of the starting relay 1DQJ (the first and second sets of rear contacts and middle contacts of 1DQJ), and one set of rear / front contacts and middle contacts of the two starting relays 2DQJ (the third set of rear / front contacts and middle contacts of 2DQJ); the relay branch also includes switch machine automatic switch contacts (the switch machine automatic switch contact group includes switch machine automatic switch contacts 11-12 when the first and third rows are closed, and switch machine automatic switch contact group includes switch machine automatic switch contacts 41-42 when the second and fourth rows are closed); the rectifier branch also includes a starting... The following are included: a set of rear and middle contacts of the 1DQJF automatic repeater relay (the first group / the first group of rear and middle contacts of 1DQJF); a set of rear / front and middle contacts of the 2DQJF automatic repeater relay (the first group / the second group of rear / front and middle contacts of 2DQJ); and contacts of the automatic switch machine (the contact group of the automatic switch machine includes contacts 33-34, 15-16, and 35-36 when the first and third rows are closed, and contacts 23-24, 45-46, and 25-26 when the second and fourth rows are closed). Among them, RD1, RD2, and RD3 are three starting fuses (air circuit breakers), and 11, 12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26, 31, 32, 33, 34, 35, 36, 41, 42, 43, 44, 45, and 46 in the AC switch machine are automatic switch contacts, and K1 and K2 are safety contacts.

[0058] Figure 7 The preferred embodiment shown, compared to the prior art, although it cannot disconnect the excitation circuit of the 3-4 coils of 1DQJ when 2DQJF cannot switch poles for some reason, will not allow two or more phases of the three-phase power to be directly output to the three-phase motor coils of the switch machine after 2DQJ switches poles. This ensures that the three-phase motor will not have two phases of power directly connected to the motor coils for a long time, thus ensuring that the motor will not burn out when one phase of power is missing.

[0059] also, Figure 7 In the preferred embodiment shown, the excitation circuit of coils 3-4 of 1DQJ is disconnected when 2DQJF turns pole, so that three-phase electricity can be output to control the forward or reverse rotation of the switch machine motor. This ensures that when the excitation circuit of coils 1-2 of 1DQJ is disconnected during a phase loss, 1DQJ can fall down in time to cut off the starting circuit, thus ensuring that the phase loss protection circuit composed of coils 1-2 of 1DQJ can play its role in phase loss protection.

[0060] In the existing technology, the forward and reverse rotation of the motor is achieved by controlling the phase sequence switching of the B and C phases of the 2DQJ through the two sets of contacts of the 2DQJ. However, the centralized monitoring and acquisition is based on the third set of contacts of the 2DQJF. When the 2DQJF does not rotate, the switching direction of the turnout cannot be accurately monitored. Figure 7 In the preferred embodiment shown, the forward and reverse rotation of the motor is achieved by controlling the phase sequence switching of the B and C phases of the 2DQJF through two sets of contacts. The third set of contacts of the 2DQJF, which is centrally monitored and collected, can accurately monitor the switching direction of the turnout.

[0061] Please see Figure 8 ,like Figure 8 The diagram shows a drive circuit diagram of the turnout interface section of a computer-interlocked three-phase AC turnout control circuit provided by the prior art. (a) is the drive circuit diagram of the turnout interface section of the computer-interlocked three-phase AC turnout control circuit, where PIO- in the drive board PIO-OUT represents the drive command and IOF represents the negative drive voltage. (b) is the acquisition circuit diagram of the turnout interface section of the computer-interlocked three-phase AC turnout control circuit, where PIO- in the acquisition board PIO-IN represents the acquisition information and IOZ represents the positive acquisition voltage. Figure 8 The computer interlocking system shown in (a) controls the turnout's transition from reverse to normal (or normal to reverse) by simultaneously driving the DCJ (or FCJ) and the anti-locking relay SFJ. Figure 8 (b) The computer interlocking system realizes the determination of turnout position (position, reverse, four-way open) by real-time acquisition of the state of the front contact of the positioning relay DBJ, the front contact of the reverse relay FBJ, the state of the rear contact of the positioning relay DBJ and the rear contact of the reverse relay FBJ connected in series, and the state of the front contact of the locking and anti-locking relay SFJ.

[0062] In recent years, commonly used computer interlocking systems typically achieve turnout switching from reverse to normal (or normal to reverse) by simultaneously driving DCJ (or FCJ) and auxiliary control relays (generally named YCJ or SFJ). The system also collects in real time the status of the DBJ front contact (generally represented by DBJ), the FBJ front contact (generally represented by FBJ), the status of the DBJ and FBJ rear contacts connected in series (generally represented by DBFB_H or DFH), and the status of the auxiliary control relay front contact (generally represented by YCJ or SFJ). The interlocking system can only provide a positional or reverse position indication if at least one of the DBJ and FBJ switch quantities is 1 and DBFB_H cannot be 1. Errors in the construction, missed inspections, or untimely maintenance of the interlocking circuit by signal maintenance personnel may cause the series circuit switch quantity acquisition of the back contact of the timer and reverse relays to fail (or the acquisition line to be open). The interlocking system will mistakenly assume that DBFB_H is always 0. When the turnout is in the four-way open position, the acquisition of the switch quantity of the front contact of the timer or reverse relay may be mixed with the positive voltage (IOZ), potentially causing a false turnout indication and jeopardizing train safety.

[0063] In addition, errors in the construction, omissions in inspection and repair, and untimely maintenance of the interlocking circuit by signal maintenance personnel may cause KZ electricity to be mistakenly mixed into the 3rd coil of 1DQJ, or further mix into the 4th coil of 1DQJ with control negative electricity (KF), or cause the turnout to malfunction when operating the turnout (by abandoning the track clearance inspection condition of the turnout section), endangering train operation and personal safety.

[0064] Please see Figure 9 ,like Figure 9 The diagram shows a drive-and-slot alarm diagram of a computer-controlled three-phase AC turnout control circuit interlocking system according to an embodiment of the present invention. (a) is a drive-and-slot alarm diagram of the three-phase AC turnout control circuit interlocking system during positioning operation, and (b) is a drive-and-slot alarm diagram of the three-phase AC turnout control circuit interlocking system during reversing operation.

[0065] Preferably, in the computer-interlocked three-phase AC turnout control circuit, the energizing and energizing of the positioning control relay DCJ / reverse control relay FCJ and the locking and anti-locking relay SFJ is driven by the computer interlocking system; the timing of the computer interlocking system driving the positioning control relay DCJ / reverse control relay FCJ and the locking and anti-locking relay SFJ is asynchronous, specifically:

[0066] When performing positioning control, the positioning control relay DCJ is driven first. After a first preset time t1, the system selects whether to drive the locking relay SFJ. If the computer interlocking system detects a change in the switch state of the front contact of the positioning indicator relay DBJ from 1 to 0 before the first preset time t1, the computer interlocking system issues an alarm and stops driving the positioning control relay DCJ and the locking relay SFJ, locking the turnout. If the computer interlocking system does not detect a change in the switch state of the front contact of the positioning indicator relay DBJ from 1 to 0 before the first preset time t1, the computer interlocking system continues to drive the locking relay SFJ.

[0067] When operating in the reverse position, the reverse position operation relay FCJ is driven first. After a first preset time t1, the system selects whether to drive the locking relay SFJ. If the computer interlocking system detects a change in the switching state of the front contact of the reverse position indicator relay FBJ from 1 to 0 before the first preset time t1, the computer interlocking system issues an alarm and stops driving the reverse position operation relay FCJ and the locking relay SFJ, locking the turnout. If the computer interlocking system does not detect a change in the switching state of the front contact of the reverse position indicator relay FBJ from 1 to 0 before the first preset time t1, the computer interlocking system continues to drive the locking relay SFJ. The first preset time t1 is no greater than 3 seconds.

[0068] More preferably, in the computer interlocking control circuit for three-phase AC turnouts, if the computer interlocking system does not collect the change of the switch state of the front contact of the anti-locking relay SFJ from 0 to 1 before the second preset time t2 is reached, the computer interlocking system will issue an alarm for inconsistent acquisition of the anti-locking relay SFJ drive.

[0069] If the computer interlocking system detects a change in the switch state of the front contact of the anti-locking relay SFJ from 0 to 1 before the second preset time t2 is reached, and detects a change in the switch state of the front contact of the positioning relay DBJ from 1 to 0 / the switch state of the front contact of the reverse positioning relay FBJ from 1 to 0 before the third preset time t3 is reached, but does not detect a change in the series switch state of the rear contacts of the positioning relay DBJ and the reverse positioning relay FBJ from 0 to 1, then the computer interlocking system will issue an alarm and block the turnout.

[0070] If the switch status of the front contact of the positioning relay DBJ / reverse positioning relay FBJ changes from 0 to 1 before the fourth preset time t4 is reached, the computer interlocking system will issue a turnout no-indication alarm.

[0071] The second preset time t2 < the third preset time t3 < the fourth preset time t4, and the third preset time t3 is not greater than 4 seconds.

[0072] Figure 9 In the preferred embodiment, (1) it effectively checks and prevents the risk of incorrect KZ electricity being mixed into the 3 coil of 1DQJ due to incorrect construction, missed inspection and maintenance by signal personnel, which could lead to the further mixing of control negative electricity (KF) into the 4 coil of 1DQJ or the risk of incorrect turnout operation when the turnout is operated (by bypassing the track clearance inspection condition of the turnout section). (2) It effectively checks and prevents the risk of false turnout indication caused by the failure of the series circuit switch quantity acquisition of the back contact of the fixed and reverse relays due to incorrect construction, missed inspection and maintenance by signal personnel, which could lead to the mixing of positive electricity (IOZ) into the switch quantity acquisition of the front contact of the fixed or reverse relay when the turnout is in the four-open position.

[0073] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A computer-interlocked three-phase AC turnout control circuit, characterized in that, The circuit includes a turnout relay logic control circuit, a turnout operation circuit, and a turnout indication circuit, wherein: The logic control circuit for the turnout relay includes a starting relay 1DQJ, a starting repeater relay 1DQJF, a second starting relay 2DQJ, a second starting repeater relay 2DQJF, a protection relay BHJ, a positioning control relay DCJ, a reverse position control relay FCJ, and a locking relay SFJ. A set of rear / front contacts and a middle contact of the second starting repeater relay 2DQJF are connected in series in the 3-4 coil excitation circuit of the first starting relay 1DQJ. The turnout operating circuit includes a three-phase AC power supply (A, B, C), three three-phase transmission lines, and three coil windings of the switch machine motor. The three coil windings of the switch machine motor are respectively a first coil winding (a), a second coil winding (b), and a third coil winding (c). The three three-phase transmission lines are respectively a first three-phase transmission line S1, a second three-phase transmission line S2, and a third three-phase transmission line S3. The three-phase AC power supply (A, B, C) is output to the first coil winding (a), the second coil winding (b), and the third coil winding (c) / the third coil winding (c) and the second coil winding (b) of the switch machine motor through the first three-phase transmission line S1, the second three-phase transmission line S2, and the third three-phase transmission line S3, respectively, to control the switch machine motor to switch between the positioning and reverse positions. A set of rear / front contacts and a middle contact of the two-start repeater relay 2DQJF are connected in series in the second three-phase transmission line S2 and the third three-phase transmission line S3. The turnout indication circuit includes a power supply branch, an indication relay branch, and a rectifier branch; the indication relay branch is connected in series with the power supply branch, and the rectifier branch is connected in parallel with the indication relay branch; the indication relay branch includes coils 1-4 of the positioning indication relay DBJ / reverse indication relay FBJ and the third coil winding c; the power supply branch includes the secondary coil of the indication transformer BD1-7, the protection resistor element R1, and the first coil winding a; the rectifier branch includes the rectifier diode element Z, the resistor element R, and the second coil winding b; a set of rear / front contacts and a middle contact of the two-start relay 2DQJ are connected in series in the power supply branch, and a set of rear / front contacts and a middle contact of the two-start repeater relay 2DQJF are connected in series in the rectifier branch.

2. The computer-interlocked three-phase AC turnout control circuit according to claim 1, characterized in that, The second three-phase transmission line S2 and the third three-phase transmission line S3 are connected in series with a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF, including the second three-phase transmission line S2 and the third three-phase transmission line S3 being connected in series with a set of rear / front contacts and middle contacts of the two-start repeater relay 2DQJF.

3. The computer-interlocked three-phase AC turnout control circuit according to claim 2, characterized in that, The excitation circuit of coils 3-4 of the starting relay 1DQJ is connected in series with a set of rear / front contacts and a middle contact of the two starting repeater relays 2DQJF, as well as a set of front contacts and a middle contact of the positioning control relay DCJ / reverse control relay FCJ; the excitation circuit of coils 1-4 of the starting repeater relay 1DQJF is connected in series with a set of front contacts and a middle contact of the starting relay 1DQJ; the excitation circuit of coils 1-2 / 3-4 of the two starting relays 2DQJ is connected in series with the starting repeater relay... A set of front and middle contacts of the device 1DQJF and a set of front and middle contacts of the positioning control relay DCJ / reverse control relay FCJ; a set of rear / front and middle contacts of the two starting relays 2DQJF are connected in series in the excitation circuit of the 1-2 / 3-4 coils of the two starting repeater relays 2DQJF; a set of front and middle contacts of the one starting relay 1DQJ itself and a set of front and middle contacts of the protection relay BHJ are connected in series in the excitation circuit of the 1-2 coil of the one starting relay 1DQJ. The first three-phase transmission line includes a first AC input / output terminal of a phase loss protector DBQ, and a set of front and middle contacts of a starting relay 1DQJ; the second three-phase transmission line includes a second AC input / output terminal of the phase loss protector DBQ, a set of front and middle contacts of a starting repeater relay 1DQJF, and a set of rear / front and middle contacts of a starting repeater relay 2DQJF; the third three-phase transmission line includes a third AC input / output terminal of the phase loss protector DBQ, a set of front and middle contacts of a starting repeater relay 1DQJF, and a set of rear / front and middle contacts of a starting repeater relay 2DQJF; the 1-4 coils of the protection relay BHJ are connected to the DC output terminal of the phase loss protector DBQ; The power supply branch also includes two sets of rear contacts and a middle contact of the first starting relay 1DQJ, and one set of rear / front contacts and a middle contact of the second starting relay 2DQJ; the indicator relay branch also includes contacts of the automatic switch machine switch; the rectifier branch also includes one set of rear contacts and a middle contact of the first starting repeater relay 1DQJF, one set of rear / front contacts and a middle contact of the second starting repeater relay 2DQJF, and contacts of the automatic switch machine switch.

4. A computer-interlocked three-phase AC turnout control circuit according to claim 1, characterized in that, The energizing and energizing of the positioning control relay DCJ / reverse position control relay FCJ and the locking and anti-locking relay SFJ are driven by the computer interlocking system; the timing of the computer interlocking system driving the positioning control relay DCJ / reverse position control relay FCJ and the locking and anti-locking relay SFJ is asynchronous, specifically: When performing positioning operation, the positioning operation relay DCJ is driven first. After the first preset time t1 is reached, it is selected whether to drive the locking relay SFJ. If the computer interlocking system collects the switch state of the front contact of the positioning indicator relay DBJ from 1 to 0 before the first preset time t1, the computer interlocking system issues an alarm and stops driving the positioning operation relay DCJ and the locking relay SFJ, and locks the turnout. If the computer interlocking system does not detect a change in the switching state of the front contact of the positioning indicator relay DBJ from 1 to 0 before the first preset time t1, the computer interlocking system will continue to drive the anti-lock relay SFJ. When operating in the reverse position, the reverse position operation relay FCJ is driven first. After a first preset time t1, the system selects whether to drive the locking relay SFJ. If the computer interlocking system detects a change in the switching state of the front contact of the reverse position indicator relay FBJ from 1 to 0 before the first preset time t1, the computer interlocking system issues an alarm and stops driving the reverse position operation relay FCJ and the locking relay SFJ, locking the turnout. If the computer interlocking system does not detect a change in the switching state of the front contact of the reverse position indicator relay FBJ from 1 to 0 before the first preset time t1, the computer interlocking system continues to drive the locking relay SFJ. The first preset time t1 is no greater than 3 seconds.

5. A computer-interlocked three-phase AC turnout control circuit according to claim 4, characterized in that, If the computer interlocking system fails to detect a change in the switch state of the front contact of the anti-locking relay SFJ from 0 to 1 before the second preset time t2 is reached when the driving time of the anti-locking relay SFJ reaches the second preset time, the computer interlocking system will issue an alarm for inconsistent acquisition of the anti-locking relay SFJ driving. If the computer interlocking system detects a change in the switch state of the front contact of the anti-locking relay SFJ from 0 to 1 before the second preset time t2 is reached, and detects a change in the switch state of the front contact of the positioning relay DBJ from 1 to 0 / the switch state of the front contact of the reverse positioning relay FBJ from 1 to 0 before the third preset time t3 is reached, but does not detect a change in the series switch state of the rear contacts of the positioning relay DBJ and the reverse positioning relay FBJ from 0 to 1, then the computer interlocking system will issue an alarm and block the turnout. If the switch status of the front contact of the positioning relay DBJ / reverse positioning relay FBJ changes from 0 to 1 before the fourth preset time t4 is reached, the computer interlocking system will issue a turnout no-indication alarm. The second preset time t2 < the third preset time t3 < the fourth preset time t4, and the third preset time t3 is not greater than 4 seconds.

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