CN-121973636-A - Main circuit breaker control circuit, method and vehicle

Abstract

The application provides a main circuit breaker control circuit, a method and a vehicle, wherein the circuit comprises a main circuit breaker enabling circuit, at least one traction control unit provided with a main breaking interlocking contact, wherein the main breaking interlocking contact comprises a first contact, a second contact and a third contact, when the traction control unit is in a normal working state, the first contact, the second contact and the third contact are conducted to enable the main circuit breaker enabling circuit to be conducted, when the traction control unit is in an abnormal state, the first contact and the second contact are disconnected to enable the main circuit breaker enabling circuit to be disconnected, and a central control unit is coupled with a bypass output port, and when the main breaking interlocking contact abnormality is detected to cause that the main circuit breaker enabling circuit cannot be switched according to expectations, the control of the main breaking interlocking contact is bypassed through the bypass output port. By adopting the technical scheme, the breaking reliability and the overall operation safety of the traction system under the emergency working condition and element fault conditions can be improved.

Inventors

• SONG JUNJUN
• GUO WENYONG
• FU LEI
• MU JUNBIN
• DU FEI
• ZHAO JIAYING
• DONG LIFANG
• ZHANG HONGXING
• DONG JINGCHAO

Assignees

• 中车唐山机车车辆有限公司

Dates

Publication Date

20260505

Application Date

20260325

Claims (14)

1. 1. A main breaker control circuit, comprising: A main breaker enabling circuit connected to the main breaker; The traction control unit is internally provided with a main break interlocking contact which comprises a first contact, a second contact and a third contact, wherein the first contact and the second contact are connected in series with the main breaker enabling loop so as to control the power-on states of a first relay and a second relay in the main breaker enabling loop, and the third contact is used for controlling a third relay in the main breaker enabling loop; When the traction control unit is in a normal working state, the first contact, the second contact and the third contact are conducted, so that the main circuit breaker enables a loop to be conducted; when the traction control unit is in an abnormal state, the first contact and the second contact are disconnected, so that the main circuit breaker enables a loop to be disconnected; and the central control unit is coupled with a bypass output port, and bypasses the control of the main breaking interlocking contact through the bypass output port when the main breaker enabling loop cannot be switched according to expectations due to the fact that the main breaking interlocking contact is detected to be abnormal.
2. 2. The main circuit breaker control circuit of claim 1, wherein the first contact, the second contact, and the bypass output port are each connected to the first relay, the second relay; Wherein the powered state of the first relay and the second relay is cooperatively controlled by the first contact and the second contact in response to when both the first contact and the second contact are capable of being turned on and/or off; and when the traction control unit is in an abnormal state and the power-on states of the first relay and the second relay cannot be controlled through the first contact and the second contact, the central control unit simultaneously controls the power-on states of the first relay and the second relay through the bypass output port.
3. 3. The main breaker control circuit according to claim 1 or 2, wherein the main breaker enabling circuit comprises a first main breaker enabling circuit and a second main breaker enabling circuit, wherein at least one traction control unit comprises a first traction control unit and a second traction control unit, the first traction control unit is used for controlling the on-off of the first main breaker enabling circuit, and the second traction control unit is used for controlling the on-off of the second main breaker enabling circuit; The first relay, the second relay and the third relay in the first main breaker enabling loop are provided with a first auxiliary contact, a second auxiliary contact and a third auxiliary contact which are respectively corresponding, the first relay, the second relay and the third relay in the second main breaker enabling loop are provided with a fourth auxiliary contact, a fifth auxiliary contact and a sixth auxiliary contact which are respectively corresponding, and the first auxiliary contact to the sixth auxiliary contact are connected in series between the main breaking enabling relay and a power voltage.
4. 4. A main circuit breaker control circuit according to claim 3, characterized in that a disconnector is provided between the first traction control unit and the second traction control unit, the disconnector having a corresponding auxiliary normally closed contact, the main break enabling relay having a corresponding first main break contact and second main break contact; The first end of the auxiliary normally-closed contact is respectively connected with the third auxiliary contact and the sixth auxiliary contact, the second end of the auxiliary normally-closed contact is respectively connected with the main break enabling relay and the fifth auxiliary contact, and the fourth auxiliary contact is positioned between the sixth auxiliary contact and the fifth auxiliary contact; the first end of the first main breaking contact is respectively connected with the second auxiliary contact and the third contact, and the second end of the first main breaking contact is respectively connected with the sixth auxiliary contact and the fourth auxiliary contact; The second main breaking contact is arranged between the power supply voltage and the main breaker.
5. 5. The main circuit breaker control circuit of claim 1, wherein an input contactor is further disposed inside the traction control unit, the input contactor and the third contact forming a mutually exclusive linkage relationship; The central control unit is used for outputting a bypass control command through the bypass output port when the traction control unit is determined to be faulty and the traction control unit which has executed fault removal is determined to be in an off state, so as to realize bypass control on the traction control unit which is faulty.
6. 6. The main breaker control circuit of claim 5, wherein the central control unit obtains a first state signal of the input contactor through an input/output module and/or obtains a second state signal of the input contactor fed back by the traction control unit through bus communication with the traction control unit; wherein, when the input and output module can normally communicate, the central control unit determines the state of the input contactor based on a first state signal acquired by the input and output module; And when the input/output module is in a communication abnormal state and the traction control unit can communicate normally, the central control unit determines the state of the input contactor based on a second state signal fed back by the traction control unit.
7. 7. The main breaker control circuit of claim 1, wherein: the traction control unit is capable of sending indication information indicating self-failure to the central control unit, and the central control unit performs operation of the traction control unit for removing failure based on the indication information; and/or the central control unit monitors the running environment state of the traction control unit and executes the operation of the traction control unit for cutting off faults when the running environment state is abnormal; wherein the central control unit performs an operation of resecting the traction control unit in response to any one of: the traction transformer in the traction control unit is cut off; Communication faults occur at a first preset time after the train is electrified in all input and output modules of a vehicle where the traction control unit is located; At a second preset time after the train is electrified, any one power supply breaker in the traction control unit breaks down; A cooling fan contactor in a cooling system of the traction control unit cannot be closed; The cooling fan power supply circuit breaker in the traction control unit cooling system has an open fault; The cooling pump in the traction control unit cooling system fails to start or the cooling pump power supply breaker fails; Receiving a manual operation instruction for cutting off the fault traction control unit through a human-computer interface; in the case where the traction control unit is not cut off and the power supply is normal, a communication failure occurs.
8. 8. A main breaker control method, characterized by being applied to the main breaker control circuit according to any one of claims 1 to 7, comprising: Acquiring a working state of a traction control unit, and controlling the state of a main break interlocking contact based on the working state, wherein the main break interlocking contact comprises a first contact, a second contact and a third contact, wherein the first contact, the second contact and the third contact are controlled to be in a conducting state when the traction control unit is in a normal working state; controlling the power-on or power-off states of a first relay and a second relay in a main breaker enabling loop according to the states of the first contact and the second contact, and controlling the power-on or power-off state of a third relay in the main breaker enabling loop according to the state of the third contact; In response to detecting that a main break interlocking contact abnormality in the traction control unit causes the main breaker enabling circuit to fail to switch as expected, bypassing control of the main break interlocking contact through a bypass output port; And controlling the on or off of the main breaker enabling loop based on the power-on or power-off states of the first relay, the second relay and the third relay and the bypass result of the bypass output port, so that the main breaker is closed or opened.
9. 9. The main circuit breaker control method according to claim 8, wherein an input contactor is further provided inside the traction control unit, and the input contactor and the third contact form a mutually exclusive linkage relationship; When detecting that the main breaker enabling loop cannot be switched as expected, the bypass output port bypasses the control of the main breaking interlocking contact, and the control method comprises the following steps: When the central control unit determines that the traction control unit fails and determines that the traction control unit is cut off and the input contactor is in an off state, a bypass control command is output through the bypass output port to control the on-off of the first relay and the second relay, so that bypass control of the traction control unit with failure is realized.
10. 10. The main breaker control method according to claim 9, characterized in that the state of the input contactor is acquired in such a manner that: the central control unit acquires a first state signal from the input/output module, wherein the first state signal can reflect the state of the input contactor, and/or acquires a second state signal of the input contactor fed back by the traction control unit through a bus communication mode with the traction control unit; Determining, by the central control unit, a state of the input contactor based on a first state signal acquired by the input/output module in response to the input/output module being capable of normal communication; And when the input/output module is in a communication abnormal state and the traction control unit can communicate normally, determining the state of the input contactor by the central control unit based on a second state signal fed back by the traction control unit.
11. 11. The main breaker control method according to claim 8, wherein the internal contact of the traction control unit and the bypass function of the bypass output port are tested by the cooperation of the central control unit and the traction control unit in a state where the train has no high voltage, the test method comprising: The central control unit sends an interlocking test starting signal to each traction control unit, and the interlocking test starting signal is used for enabling a first contact and a second contact in each traction control unit to be in a closed state so as to enable the first relay and the second relay to be closed cooperatively; Responding to the first relay and the second relay which are in a closed state, and sequentially sending a first release test instruction, a bypass test instruction and a second release test instruction through the central control unit according to a preset test flow, wherein the first release test instruction is used for enabling a first contact and a second contact in each traction control unit to be disconnected, the bypass test instruction is used for enabling the first relay and the second relay to be closed, and the second release test instruction is used for enabling a third contact in each traction control unit to be disconnected; monitoring state changes of relays corresponding to the first contact, the second contact, the third contact and the bypass output port respectively through the central control unit, and judging whether each testing step passes or not; And when any test step fails, terminating the test and restarting the test flow.
12. 12. The main breaker control method of claim 11, wherein the at least one traction control unit includes a first traction control unit and a second traction control unit; The preset test flow comprises the following steps: Sending a first release test instruction to the first traction control unit, so that the first traction control unit opens the first contact, and determining that the test for the first contact passes when detecting that the first relay and the second relay are changed from a closed state to an open state; during the action period of the first release test instruction, a bypass test instruction is sent to a first sub bypass output port, when the first relay and the second relay are detected to be changed from an open state to a closed state, and when the action period of the bypass test instruction is finished, the first contact is restored to the closed state, and the pass of the test on the bypass output port is determined; Sending a first release test instruction to the second traction control unit, so that the second traction control unit opens the first contact, and when the first relay and the second relay are detected to be changed from a closed state to an open state, determining that the test on the first contact is passed; During the action period of the first release test instruction, a bypass test instruction is sent to a second sub-bypass output port, when the first relay and the second relay are detected to be changed from an open state to a closed state, and when the action period of the bypass test instruction is finished, the first contact is restored to the closed state, and the test passing of the bypass output port is determined; Sending the first release test instruction to the first traction control unit, so that the first traction control unit opens the second contact, and when the first relay and the second relay are detected to be changed from a closed state to an open state, determining that the test on the second contact is passed; During the action period of the first release test instruction, a bypass test instruction is sent to the first sub bypass output port, when the first relay and the second relay are detected to be changed from an open state to a closed state, and when the action period of the bypass test instruction is finished, the second contact is restored to the closed state, and the test passing of the bypass output port is determined; Sending the first release test instruction to the second traction control unit, so that the second traction control unit opens the second contact, and determining that the test on the second contact passes when detecting that the first relay and the second relay are changed from a closed state to an open state; During the action period of the first release test instruction, a bypass test instruction is sent to the second sub-bypass output port, when the first relay and the second relay are detected to be changed from an open state to a closed state, and when the action period of the bypass test instruction is finished, the second contact is restored to the closed state, and the test passing of the bypass output port is determined; sending the second release test instruction to the first traction control unit, so that a third contact in the first traction control unit generates a preset on-off action, and when the third relay is detected to have a rising edge change from opening to closing, determining that the test on the third contact is passed; and sending the second release test instruction to the second traction control unit, so that a third contact in the second traction control unit generates a preset on-off action, and when the third relay is detected to have a rising edge change from opening to closing, determining that the test on the third contact is passed.
13. 13. The main circuit breaker control method of claim 12, wherein the first traction control unit further has a first input contactor therein, the second traction control unit further has a second input contactor therein, and the preset test procedure further comprises: Transmitting a main break release instruction to the first traction control unit after the test of the second contact of the second traction control unit is passed, so that a first input contactor in the first traction control unit generates a preset on-off action, and when the third relay is detected to have a rising edge change from open to closed, determining that the test of the first input contactor is passed, and then executing the test of the third contact in the first traction control unit; and after the test of the third contact point of the first traction control unit is passed, sending the main breaking release instruction to the second traction control unit, so that a second input contactor in the second traction control unit generates a preset on-off action, and when the third relay is detected to have a rising edge change from opening to closing, determining that the test of the second input contactor is passed, and then executing the test of the third contact point in the second traction control unit.
14. 14. A vehicle, characterized by comprising: a main breaker; the main breaker control circuit of any one of claims 1 to 7, connected to the main breaker, for controlling the closing or opening of the main breaker.

Description

Main circuit breaker control circuit, method and vehicle Technical Field The application relates to the technical field of rail transit, in particular to a main circuit breaker control circuit, a main circuit breaker control method and a vehicle. Background The main circuit breaker of the high-speed motor train unit is a key electric connection device between a train and a high-voltage contact network. In the train running process, 27.5kV high-voltage alternating current is obtained from the overhead contact system through the pantograph, is input into the traction transformer after being connected through the main circuit breaker and the roof isolating switch, and is subjected to voltage reduction treatment, and then electric energy is connected into the traction transformer. The traction system sequentially completes the establishment of a direct current bus through a precharge switch, a main contactor and other parts, and is connected with a rectifier and an inverter. The traction motor is controlled by the inverter, so that the traction operation of the train is realized. When critical power devices such as Insulated Gate Bipolar Transistors (IGBTs) and main contactors in the traction system are in emergency such as short circuit, breakdown or other serious faults, the traction system needs to be disconnected from the high-voltage power supply rapidly so as to prevent the faults from further expanding, and thus the safe operation of the traction transformer, the traction converter and related electrical equipment is protected. Because the main circuit breaker directly bears and controls the high-voltage power supply, the judging process of the closing or opening state of the main circuit breaker is a key link for realizing the safety protection of a train traction system. However, the on-off control scheme of the main circuit breaker in the existing scheme still has defects, and the overall performance and reliability are required to be further improved. The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Disclosure of Invention The embodiment of the application provides a main circuit breaker control circuit, a main circuit breaker control method and a vehicle, which can improve the circuit breaking reliability and the overall operation safety of a traction system under the conditions of emergency working conditions and element faults. In a first aspect of an embodiment of the present application, there is provided a main breaker control circuit including: A main breaker enabling circuit connected to the main breaker; The traction control unit is internally provided with a main break interlocking contact which comprises a first contact, a second contact and a third contact, wherein the first contact and the second contact are connected in series with the main breaker enabling loop so as to control the power-on states of a first relay and a second relay in the main breaker enabling loop, and the third contact is used for controlling a third relay in the main breaker enabling loop; When the traction control unit is in a normal working state, the first contact, the second contact and the third contact are conducted, so that the main circuit breaker enables a loop to be conducted; when the traction control unit is in an abnormal state, the first contact and the second contact are disconnected, so that the main circuit breaker enables a loop to be disconnected; and the central control unit is coupled with a bypass output port, and bypasses the control of the main breaking interlocking contact through the bypass output port when the main breaker enabling loop cannot be switched according to expectations due to the fact that the main breaking interlocking contact is detected to be abnormal. In a second aspect of the embodiments of the present application, a circuit breaker control method is provided, which is applied to the main circuit breaker control circuit according to any one of the foregoing embodiments, and the main circuit breaker control method includes: Acquiring a working state of a traction control unit, and controlling the state of a main break interlocking contact based on the working state, wherein the main break interlocking contact comprises a first contact, a second contact and a third contact, wherein the first contact, the second contact and the third contact are controlled to be in a conducting state when the traction control unit is in a normal working state; controlling the power-on or power-off states of a first relay and a second relay in a main breaker enabling loop according to the states of the first contact and the second contact, and controlling the power-on or power-off state of a third relay in the main breaker enabling loop according to the state of the third