A control method for high-voltage isolating switch of electric locomotive

Abstract

The application provides a high-voltage isolating switch control method for an electric locomotive, which comprises: adding a pantograph isolation change-over switch for isolating a fault pantograph in each high-voltage isolating switch control circuit, and controlling the action of the corresponding high-voltage isolating switch through the pantograph isolation change-over switch; the pantograph isolation change-over switch comprises mutually corresponding operation position contacts and isolation position contacts, the operation position contacts comprise contact 5, contact 6, contact 7 and contact 8 in sequence, and the isolation position contacts comprise contact 1, contact 2, contact 3 and contact 4 in sequence. The application can solve the hidden danger of grounding caused by the misaction of the high-voltage isolating switch, prevent the pantograph and catenary fault, and ensure the normal operation of railway transportation.

Description

Technical Field

[0001] This invention relates to high-voltage disconnect switches for electric locomotives, and more particularly, to a control method for high-voltage disconnect switches for electric locomotives. Background Technology

[0002] Each electric locomotive has two high-voltage disconnect switches, used to connect or disconnect the pantograph from the main circuit. Under normal circumstances, the high-voltage disconnect switches are in the running position, and the pantograph is connected to the main circuit. In the event of a pantograph-catenary fault, the driver performs an isolation operation on the display screen. This energizes the grounding coil of the high-voltage disconnect switch's solenoid valve, switching the high-voltage disconnect switch to the isolation position and disconnecting the pantograph from the main circuit. The high-voltage disconnect switches must be switched when there is no power. The locomotive's grid-side circuit is shown in [link to locomotive information]. Figure 1 As shown.

[0003] The existing high-voltage disconnect switch control method on electric locomotives involves the operator selecting the pantograph mode on a microcomputer display screen. The microcomputer screen transmits the command to the microcomputer, which then performs logical judgment and transmits the command to the 17M and 18M modules in the high-voltage cabinet. This applies 110V+ power to the corresponding solenoid valves, causing the high-voltage disconnect switch to operate. The existing locomotive high-voltage disconnect switch control principle diagram is shown below. Figure 2 For example, according to the pantograph mode selected by the operator on the microcomputer display screen, and based on the location of the driver's cab, pantograph 1 is selected to operate. High-voltage disconnect switch 1 needs to operate, and the microcomputer will control 17M-DO1 or 18M-DO1 to be energized, i.e., line 356 is energized. The working coil of the high-voltage disconnect switch QS1 solenoid valve is energized, and the solenoid valve actuates, causing the main contacts of high-voltage disconnect switch QS1 to close. Figure 1 When the main contacts of QS1 close, the main circuit between the pantograph and the vacuum circuit breaker is connected. If pantograph 1 malfunctions, pantograph 2 will be selected to operate on the microcomputer display screen. High-voltage disconnector 1 must be disconnected, and the microcomputer will energize 17M-DO2 or 18M-DO2 (i.e., line 357 will be energized). This energizes the grounding coil of the solenoid valve of high-voltage disconnector QS1, opening the main contacts of the high-voltage disconnector. Figure 1 When the main contact of QS1 is open, the main circuit connection between pantograph 1 and vacuum circuit breaker is broken. The control logic is as follows: Figure 3 As shown.

[0004] When faults such as module burnout or cross-current occur, the high-voltage disconnect switch may malfunction, or the grounding solenoid valve may be accidentally energized, causing the grounding main contact of the high-voltage disconnect switch to switch from the "working position" to the "grounding position", resulting in the contact network discharging to the ground and causing the contact network to trip. In severe cases, the contact network may be burned. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a control method for high-voltage disconnect switches in electric locomotives, which solves the grounding hazards caused by malfunctions of high-voltage disconnect switches, prevents pantograph-catenary faults, and ensures the normal operation of railway transportation.

[0006] The technical means employed in this invention are as follows:

[0007] A control method for a high-voltage disconnector switch in an electric locomotive includes:

[0008] A pantograph isolating transfer switch for isolating faulty pantographs is added to each high-voltage disconnector control circuit, and the operation of the corresponding high-voltage disconnector is controlled by the pantograph isolating transfer switch.

[0009] The pantograph isolating switch includes corresponding operating contacts and isolating contacts. The operating contacts include contacts 5, 6, 7 and 8 in sequence, and the isolating contacts include contacts 1, 2, 3 and 4 in sequence.

[0010] Contacts 1, 5, 3, and 7 are each independently connected to a digital input / output module, which is connected to a microcomputer for receiving control commands.

[0011] Contact 2 is connected to a 110V input voltage, contact 6 is used to connect to the working coil of the solenoid valve of the high-voltage disconnect switch, contact 4 is used to connect to the grounding coil of the solenoid valve of the high-voltage disconnect switch, and contact 8 is used to connect to the lifting solenoid valve.

[0012] When the pantograph isolating changeover switch is in the operating position, contacts 5 and 6 are connected, and the grounding coil of the solenoid valve of the high-voltage isolating switch is disconnected; when the pantograph isolating changeover switch is in the isolating position, contacts 3 and 4 are connected, and the working coil of the solenoid valve of the high-voltage isolating switch is disconnected.

[0013] Furthermore, when the pantograph isolation switch is in the isolation position, contacts 7 and 8 are disconnected, thereby cutting off the energizing circuit of the pantograph lifting solenoid valve.

[0014] Furthermore, the method also includes: the microcomputer, based on the isolation request issued by the pantograph isolating switch, issues a grounding or running command after a software safety interlock, and the output command, after passing through the hardware interlock protection of the pantograph isolating switch, realizes the control of the high-voltage isolating switch solenoid valve.

[0015] Furthermore, based on the isolation request issued by the pantograph isolating switch, the microcomputer, after undergoing software safety interlocking, issues a grounding or operating command, including:

[0016] When the high-voltage disconnecting switch requests isolation, the microcomputer performs logical judgment and delays. At this time, the logical judgment includes: pantograph lowering, main circuit breaker opening, no pressure in pantograph pipeline, and grid voltage less than 5000V.

[0017] Furthermore, based on the isolation request issued by the pantograph isolating switch, the microcomputer issues a grounding or running command after a safety interlock via software, which also includes:

[0018] When the high-voltage disconnector requests operation, the microcomputer performs logical judgments, which include: pantograph lowering, main circuit breaker opening, no pressure in pantograph pipeline, and grid voltage less than 5000V.

[0019] Furthermore, when the high-voltage disconnect switch 1 moves from the running position to the isolated position, the fault history on the microcomputer display screen will record "High-voltage disconnect switch isolation 1 pantograph isolation 1".

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The control strategy of this invention enables separate control of pantograph selection and high-voltage disconnect switch, with microcomputer participating in interlocking protection. This effectively prevents the high-voltage disconnect switch from being accidentally triggered when faults such as microcomputer burnout or accidental energization of the grounding solenoid valve occur, even in dangerous situations such as grid voltage. Even if the transfer switch is misoperated, it will not cause the high-voltage disconnect switch to malfunction. Furthermore, the transfer switch is located on the high-voltage cabinet door, allowing the operator to observe the operation of the transfer switch in a timely manner, thus improving the safety and reliability of the locomotive. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is the existing grid-side circuit diagram for electric locomotives.

[0024] Figure 2 This is the control circuit diagram for an existing high-voltage disconnector switch.

[0025] Figure 3 This is the control logic diagram for an existing high-voltage disconnector.

[0026] Figure 4 This is a circuit diagram of the high-voltage disconnect switch control circuit of the present invention.

[0027] Figure 5 This is the control logic diagram for the high-voltage disconnect switch of the present invention.

[0028] In the diagram: PG1 - Pantograph 1; PG2 - Pantograph 2; F1 - Surge Arrester 1; F2 - Surge Arrester 2; F3 - Surge Arrester 3; HVB1 - High Voltage Bushing 1; HVB2 - High Voltage Bushing 2; QS1 - High Voltage Disconnect Switch 1; QS2 - High Voltage Disconnect Switch 2; TV1 - High Voltage Voltage Transformer; QF1 - Vacuum Circuit Breaker; QS3 - High Voltage Grounding Switch; TA1 - High Voltage Current Sensor; TA2 - Low Voltage Current Sensor; TM1 - Main Transformer; EB1~EB6 - Grounding Device; 17M, 18M - Switch Input / Output Module; S - High Voltage Disconnect Switch Solenoid Valve Working Coil; E - High Voltage Disconnect Switch Solenoid Valve Grounding Coil; YV93, YV94 - Pantograph Lifting Solenoid Valve; SA75, SA76 - Disconnect Changeover Switch. Detailed Implementation

[0029] 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.

[0030] This invention provides a control method for high-voltage disconnect switches in electric locomotives, comprising: adding a pantograph disconnect switch for isolating faulty pantographs to each high-voltage disconnect switch control circuit, and controlling the operation of the corresponding high-voltage disconnect switch through the pantograph disconnect switch.

[0031] Specifically, such as Figure 4 As shown, the pantograph isolating switch includes corresponding operating contacts and isolating contacts. The operating contacts include contacts 5, 6, 7, and 8 in sequence, and the isolating contacts include contacts 1, 2, 3, and 4 in sequence. Contacts 1, 5, 3, and 7 are independently connected to a digital input / output module, which communicates with a microcomputer to receive control commands. Further, contact 2 is connected to a 110V input voltage. Contact 6 is used to connect to the solenoid valve working coil of the high-voltage isolating switch, contact 4 is used to connect to the solenoid valve grounding coil of the high-voltage isolating switch, and contact 8 is used to connect to the pantograph lifting solenoid valve. When the pantograph isolating switch is in the operating position, contacts 5 and 6 are connected, and the solenoid valve grounding coil of the high-voltage isolating switch is disconnected. When the pantograph isolating switch is in the isolating position, contacts 3 and 4 are connected, and the solenoid valve working coil of the high-voltage isolating switch is disconnected.

[0032] In a preferred embodiment of the present invention, when the pantograph isolating switch is in the isolating position, contacts 7 and 8 are disconnected, thereby cutting off the energizing circuit of the pantograph lifting solenoid valve.

[0033] Furthermore, the method also includes: the microcomputer, based on the isolation request issued by the pantograph isolating switch, issues a grounding or running command after a software safety interlock, and the output command, after passing through the hardware interlock protection of the pantograph isolating switch, realizes the control of the high-voltage isolating switch solenoid valve.

[0034] Specifically, when the high-voltage disconnecting switch requests isolation, the microcomputer performs logical judgment and delays. This logical judgment includes: pantograph lowering, main circuit breaker opening, no pressure in the pantograph conduit, and mains voltage less than 5000V. When the high-voltage disconnecting switch requests operation, the microcomputer performs logical judgment, which also includes: pantograph lowering, main circuit breaker opening, no pressure in the pantograph conduit, and mains voltage less than 5000V. Figure 5 As shown.

[0035] The following specific application examples will further illustrate the solution and effects of the present invention.

[0036] In this embodiment, two pantograph isolating switches SA75 and SA76 are added to the high-voltage switchgear to control two high-voltage isolating switches respectively. The pantograph isolating switches have "Run" and "Isolate" positions. When in the "Run" position, the working solenoid valve coil is connected to the output ports of the 17M and 18M modules through points 5 and 6 of the isolating switches SA75 and SA76, while the grounding coil is disconnected. When in the "Isolate" position, the grounding solenoid valve coil is connected to the output ports of the 17M and 18M modules through points 3 and 4 of the isolating switches SA75 and SA76, while the working coil is disconnected. This hardware circuit ensures that the pantograph isolating command is consistent with the energized state of the corresponding solenoid valve of the high-voltage isolating switch, preventing malfunction. When the switches are in the "Isolate" position, points 7 and 8 of the isolating switches SA75 and SA76 also cut off the energizing circuit of the corresponding pantograph raising solenoid valves YV93 and YV94, ensuring that the corresponding pantograph cannot be raised after an isolation request.

[0037] The control principle is as follows:

[0038] When the changeover switch SA75 is in the operating position, points 5 and 6, and points 7 and 8 of the changeover switch SA75 are closed, and line 2035 is 110V+ input. Since points 1 and 2 of the changeover switch are open, input port "1" DI1 of 17M and 18M is at a low level. After the microcomputer enters the logic judgment (the locomotive has not raised the pantograph and the main circuit breaker has not closed), it outputs 110V power to the solenoid valve of high-voltage disconnect switch 1 through 17M and 18M. The power is transmitted to the working coil of the solenoid valve through the closed points 5 and 6 of the changeover switch, so that the high-voltage disconnect switch 1 is placed in the operating position. When points 7 and 8 are closed, the corresponding auxiliary contacts (T and S points) of the high-voltage disconnect switch are in the closed position, so that the pantograph raising solenoid valve YV93 is energized, allowing the corresponding pantograph PG1 to be raised.

[0039] When the changeover switch SA75 is in the isolated position, points 1 and 2, and points 3 and 4 of the changeover switch SA75 are closed. The 17M and 18M input ports "1" DI1 are at a high level. After the microcomputer enters the logic judgment (the locomotive has not raised the pantograph and the main circuit breaker is not closed), it outputs 110V power to the high-voltage disconnect switch 1 solenoid valve. The power is transmitted to the grounding coil of the solenoid valve through the closed points 3 and 4 of the changeover switch, so that the high-voltage disconnect switch 1 is in the grounded position. Points 7 and 8 are opened, and the corresponding auxiliary contacts (T and S points) of the high-voltage disconnect switch are in the open position, so that the pantograph raising solenoid valve YV93 is de-energized, ensuring that the corresponding pantograph PG1 is prohibited from being raised.

[0040] The high-voltage disconnect switch is controlled jointly by a microcomputer and a transfer switch. Based on the disconnection request from the transfer switch, the microcomputer system issues a grounding or running command after software safety interlocking. The output command, after passing through the hardware interlocking protection of the pantograph disconnect transfer switches SA75 and SA76, finally achieves control of the high-voltage disconnect switch solenoid valve. The control logic is as follows: Figure 5 As shown in the diagram, the control of the high-voltage disconnector is handled separately from the pantograph selection. Although the microcomputer display retains the pantograph pre-selection interface, it can only select the pantograph and cannot control the high-voltage disconnector. Control of the high-voltage disconnector requires a combination of the microcomputer and the transfer switch; the control is based on the instructions from the transfer switch (…). Figure 4 The microcomputer issues a grounding or running command after a safety interlock (logical judgment and delay). This command is then controlled by a switching switch before the corresponding solenoid valve of the high-voltage disconnector can be activated, thus achieving interlocked control between the microcomputer system and the switching switch for high-voltage disconnector switching. A switching switch is connected in series in the pantograph raising solenoid valve circuit. When a user requests isolation of a pantograph, the raising solenoid valve circuit is simultaneously cut off, the solenoid valve is de-energized, and the pantograph descends. In this embodiment, when the high-voltage disconnector 1 moves from the running position to the isolated position, the fault history on the microcomputer display screen will record "High-voltage disconnector 1 isolated, pantograph 1 isolated".

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a high-voltage disconnector switch in an electric locomotive, characterized in that, include: A pantograph isolating transfer switch for isolating faulty pantographs is added to each high-voltage disconnector control circuit, and the operation of the corresponding high-voltage disconnector is controlled by the pantograph isolating transfer switch. The pantograph isolating switch includes corresponding operating contacts and isolating contacts. The operating contacts include contacts 5, 6, 7 and 8 in sequence, and the isolating contacts include contacts 1, 2, 3 and 4 in sequence. Contacts 1, 5, 3, and 7 are each independently connected to a digital input / output module, which is connected to a microcomputer for receiving control commands. Contact 2 is connected to a 110V input voltage, contact 6 is used to connect to the working coil of the solenoid valve of the high-voltage disconnect switch, contact 4 is used to connect to the grounding coil of the solenoid valve of the high-voltage disconnect switch, and contact 8 is used to connect to the lifting solenoid valve. When the pantograph isolating changeover switch is in the operating position, contacts 5 and 6 are connected, and the grounding coil of the solenoid valve of the high-voltage isolating switch is disconnected; when the pantograph isolating changeover switch is in the isolating position, contacts 3 and 4 are connected, and the working coil of the solenoid valve of the high-voltage isolating switch is disconnected.

2. The control method for a high-voltage disconnect switch of an electric locomotive according to claim 1, characterized in that, When the pantograph isolating switch is in the isolation position, contacts 7 and 8 are disconnected, thereby cutting off the energizing circuit of the pantograph lifting solenoid valve.

3. The control method for a high-voltage disconnect switch of an electric locomotive according to claim 1, characterized in that, The method further includes: the microcomputer issues a grounding or running command after the pantograph isolating switch sends an isolation request, and the output command is protected by the hardware interlock of the pantograph isolating switch to control the high-voltage isolating switch solenoid valve.

4. The control method for a high-voltage disconnect switch of an electric locomotive according to claim 3, characterized in that, Based on the isolation request issued by the pantograph isolating switch, the microcomputer, after passing through the software safety interlock, issues a grounding or operating command, including: When the high-voltage disconnecting switch requests isolation, the microcomputer performs logical judgment and delays. At this time, the logical judgment includes: pantograph lowering, main circuit breaker opening, no pressure in pantograph pipeline, and grid voltage less than 5000V.

5. The control method for a high-voltage disconnect switch of an electric locomotive according to claim 4, characterized in that, Based on the isolation request issued by the pantograph isolating switch, the microcomputer, after passing through the software safety interlock, issues a grounding or operating command, which also includes: When the high-voltage disconnector requests operation, the microcomputer performs logical judgments, which include: pantograph lowering, main circuit breaker opening, no pressure in pantograph pipeline, and grid voltage less than 5000V.

6. The control method for a high-voltage disconnect switch of an electric locomotive according to claim 1, characterized in that, When the high-voltage disconnector 1 moves from the running position to the disconnect position, the fault history on the microcomputer display screen will record "High-voltage disconnector 1 disconnection pantograph 1 disconnection".

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