Urban rail transit ac-dc operation practical training circuit

Abstract

This utility model proposes an AC / DC operation training circuit for urban rail transit, including an AC circuit 1 and an AC circuit 2 configured with an interlocked backup relationship, a busbar connected to AC circuit 1 and AC circuit 2, an emergency lighting circuit connected to the busbar, a first simulated fault switch, and a second simulated fault switch. AC circuit 1 includes an AC circuit 1 incoming switch, an AC circuit 1 contactor, and a first contactor; AC circuit 2 includes an AC circuit 2 incoming switch, an AC circuit 2 contactor, and a second contactor. The AC circuit 1 incoming switch is connected to the three phase lines of a three-phase power supply, and the AC circuit 1 contactor coil is connected between two of the three phase lines. The AC circuit 2 incoming switch is also connected to the three phase lines of a three-phase power supply, and the AC circuit 2 contactor coil and the first normally closed contact of the AC circuit 1 contactor are connected in series between two of the three phase lines. This utility model can meet the needs of efficient and safe training in various scenarios.

Description

Technical Field

[0001] This utility model relates to the field of power supply and distribution training technology for rail transit, and in particular to a training circuit for AC / DC operation of urban rail transit. Background Technology

[0002] As the core hub of urban public transportation, the power supply reliability of urban rail transit systems directly affects operational safety and passenger experience. In emergencies such as sudden power outages and equipment failures, emergency lighting systems are crucial for ensuring passenger evacuation and staff emergency response, requiring seamless switching capabilities from normal AC power supply to DC emergency power supply. Therefore, training for trainees on the power supply circuits of emergency lighting systems is of great significance for improving the practical skills of practitioners and ensuring the safe operation of rail transit.

[0003] However, traditional training models have many difficulties and cannot meet actual needs: First, power supply systems in actual operation are mostly closed systems with dispersed equipment and complex operation. Trainees have difficulty accessing the core control logic of real circuits. Learning only through diagrams or theory makes it difficult for trainees to intuitively understand the dynamic switching process of "AC priority, DC backup," leading to a disconnect between theoretical knowledge and practical operation, and making it difficult to form a deep understanding of the system's operating logic. Second, simulating faults in real systems (such as contactor sticking, fuse blowing, interlock failure, etc.) may cause equipment damage or safety accidents. Therefore, it is impossible to conduct such practical training in real systems, limiting the development of trainees' fault handling capabilities. Third, existing training equipment mostly focuses on single circuits (such as pure AC or pure DC), making it difficult to cover the entire process of "AC input line - busbar distribution - emergency lighting - DC conversion" linkage control. This makes it difficult for trainees to form a systematic understanding of the entire emergency lighting power supply system, affecting the training effect. Utility Model Content

[0004] To address the aforementioned issues, this invention proposes an AC / DC operation training circuit for urban rail transit, which can meet the needs of efficient and safe training in various scenarios.

[0005] This utility model proposes an AC / DC operation training circuit for urban rail transit, including AC circuit 1 and AC circuit 2 configured in an interlocked standby relationship, a busbar connected to AC circuit 1 and AC circuit 2, an emergency lighting circuit connected to the busbar, a first simulated fault switch, and a second simulated fault switch;

[0006] AC Line 1 includes AC Line 1 incoming switch, AC Line 1 contactor, and first contactor; AC Line 2 includes AC Line 2 incoming switch, AC Line 2 contactor, and second contactor.

[0007] An AC input line switch connects to the three phase lines of a three-phase power supply, and an AC contactor coil is connected between two of the three phase lines.

[0008] One end of the first contactor coil is connected to the N line, and the other end is connected in series with the first normally closed contact of the second contactor and the normally open contact of the AC one-way contactor, and then connected to the outgoing phase line of the AC one-way incoming line switch.

[0009] One end of the second normally open contact of the first contactor is connected to the phase line on the outgoing side of the AC incoming line switch, and the other end is connected to the busbar.

[0010] The AC two-way incoming line switch connects to the three phase lines of the three-phase power supply. Between two of the three phase lines, there is a series connection of the AC two-way contactor coil and the first normally closed contact of the AC one-way contactor.

[0011] One end of the second contactor coil is connected to the N line, and the other end is connected in series with the first simulated fault switch, the second normally closed contact of AC contactor one, and the first normally closed contact of the first contactor, and then connected to the phase line of the outgoing side of the AC two incoming line switch. The second simulated fault switch is connected in parallel with the second normally closed contact of AC contactor one.

[0012] One end of the normally open contact of the AC two-way contactor is connected to the phase line on the outgoing side of the AC two-way incoming switch, and the other end is connected to the busbar.

[0013] In one embodiment, the urban rail transit AC / DC operation training circuit further includes an AC incoming line switch, one end of which is connected to the busbar and the other end is connected to the emergency lighting circuit.

[0014] In one embodiment, the urban rail transit AC / DC operation training circuit further includes a DC circuit, an AC circuit contactor, and a third simulated fault switch;

[0015] One end of the AC circuit contactor coil is connected to the busbar via the AC incoming switch, and the other end is connected to the N line;

[0016] The DC circuit includes a modular AC input switch, a power transmitter, a DC input switch, a fifth contactor, and a sixth contactor;

[0017] One end of the module's AC incoming line switch is connected to the busbar, and the other end is connected to the AC input terminal of the power transmitter;

[0018] The power transmitter converts alternating current (AC) into direct current (DC).

[0019] The DC input switch connects the positive and negative terminals of the DC output terminal of the power transmitter;

[0020] The second normally closed contact of the second contactor, the normally closed contact of the AC circuit contactor, and the coil of the sixth contactor are connected in series and then connected in parallel with the first normally open contact of the sixth contactor and the coil of the fifth contactor. One end is connected to the positive terminal of the DC output terminal of the power transmitter via a DC input switch, and the other end is connected to the emergency lighting circuit. The second normally closed contact of the first contactor is connected in parallel across the two ends of the second normally closed contact of the second contactor.

[0021] The first normally open contact, the second normally open contact, and the third normally open contact of the fifth contactor are respectively connected between the positive terminal of the DC output of the power transmitter and the emergency lighting circuit.

[0022] One end of the third simulated fault switch is connected to the negative terminal of the DC output of the power transmitter via a DC input switch, and the other end is connected to the emergency lighting circuit.

[0023] In one embodiment, the urban rail transit AC / DC operation training circuit further includes a third contactor and a fourth contactor;

[0024] After the third and fourth contactor coils are connected in parallel, one end is connected to the output terminal of the AC incoming line switch via the normally closed contacts of the sixth and fifth contactors connected in series, and the other end is connected to the emergency lighting circuit via the normally open contact of the fourth contactor. The first, second, and third normally open contacts of the third contactor are respectively connected between the output terminal of the AC incoming line switch and the emergency lighting circuit.

[0025] In one embodiment, the DC circuit also includes a DC circuit operation indicator light;

[0026] The DC circuit working indicator light is connected in series with the fifth normally open contact of the sixth contactor, and then connected in parallel with the second normally closed contact of the second contactor, the normally closed contact of the AC circuit contactor, and the coil of the sixth contactor. One end is connected to the positive terminal of the DC output terminal of the power transmitter via the DC input switch, and the other end is connected to the negative terminal of the DC output terminal of the power transmitter via the third analog fault switch.

[0027] In one embodiment, the urban rail transit AC / DC operation training circuit further includes multiple fuses, which are respectively set in AC circuit 1, AC circuit 2, and DC circuit.

[0028] In one embodiment,

[0029] The AC line also includes an AC line working indicator light. The AC line working indicator light is connected in series with the first normally open contact of the first contactor, and is connected in parallel with the first contactor coil, the first normally closed contact of the second contactor, and the normally open contact of the AC line contactor. It is then connected between the phase line and the N line on the outgoing side of the AC line incoming switch.

[0030] The AC circuit 2 also includes an AC circuit 2 working indicator light. The AC circuit 2 working indicator light is connected in series with the normally open contact of the second contactor, and is connected in parallel with the second contactor coil, the first simulated fault switch, the second normally closed contact of the AC circuit 1 contactor, and the first normally closed contact of the first contactor. It is then connected between the phase line and the N line on the outgoing side of the AC circuit 2 incoming line switch.

[0031] In one embodiment,

[0032] AC line 1 also includes AC line 1 three-phase current indicator lights, which are connected between the phase line and the neutral line on the outgoing side of the AC line 1 incoming switch;

[0033] The AC circuit 2 also includes a three-phase current indicator light, which is connected between the phase line and the neutral line on the outgoing side of the AC circuit 2 incoming switch.

[0034] In one embodiment, current transformers are connected between AC circuit 1, AC circuit 2 and the busbar, and the three-phase current values ​​are detected by an ammeter.

[0035] In one embodiment, the emergency lighting circuit includes an emergency lighting indicator light connected to the busbar.

[0036] Compared with the prior art, the beneficial effects of this utility model's AC / DC operation training circuit for urban rail transit are as follows:

[0037] 1) The AC / DC operation training circuit of this utility model can accurately reproduce the core circuit logic of the urban rail transit accident lighting system. It covers key modules such as AC dual power supply secondary wiring, AC self-cutting, AC dual-circuit interlocking, AC / DC switching, and fault lighting control. It is highly consistent with the circuit architecture in actual operation. Moreover, the equipment is centrally designed and easy to operate, which can help trainees establish an understanding of the overall system structure.

[0038] 2) The AC / DC operation training circuit for urban rail transit of this utility model can safely simulate typical fault scenarios such as switching failure, circuit disconnection, and interlock logic failure. It does not require operation in a real system, avoiding equipment damage or safety risks, and provides trainees with a safe and controllable fault handling training environment. Trainees can master core skills such as fault diagnosis and recovery through hands-on training, effectively improving their understanding of AC / DC control circuits and emergency response capabilities.

[0039] 3) The AC / DC operation training circuit for urban rail transit of this utility model can intuitively display the current path, contactor status and fault location through indicator lights. With the help of instruments such as ammeters, it can make the abstract circuit logic more concrete and help trainees quickly understand the system operation rules and fault causes. Attached Figure Description

[0040] Figure 1This is a schematic diagram of an AC / DC operation training circuit for urban rail transit according to an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of a three-phase current detection circuit in an AC / DC operation training circuit for urban rail transit, according to an embodiment of the present invention.

[0042] Figure 3 This is a schematic diagram of power supply voltage switching in an AC / DC operation training circuit for urban rail transit according to an embodiment of the present invention.

[0043] Figure 4 This is a schematic diagram of the installation and display of an AC / DC operation training circuit for urban rail transit on a hexahedron, according to an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "an embodiment" or "embodiment" in this application refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment that selectively excludes other embodiments.

[0046] This utility model proposes an AC / DC operation training circuit for urban rail transit. (See [link]) Figure 1 This includes AC circuit 1 and AC circuit 2 configured with interlocking backup, busbars connected to AC circuit 1 and AC circuit 2, emergency lighting circuits connected to the busbars, a first simulated fault switch HZ1, and a second simulated fault switch HZ2. AC circuit 1 includes AC circuit 1 incoming line switch QF1, AC circuit 1 contactor K1, and a first contactor KM1. AC circuit 2 includes AC circuit 2 incoming line switch QF2, AC circuit 2 contactor K2, and a second contactor KM2.

[0047] The AC incoming line switch QF1 connects to the three phase lines of a three-phase power supply. An AC contactor K1 coil is connected between two of the three phase lines. One end of the first contactor KM1 coil is connected to the neutral (N) line, and the other end is connected in series with the first normally closed contact 21 of the second contactor KM2 and the normally open contact 103 of the AC contactor K1, then connected to the outgoing phase line of the AC incoming line switch QF1. One end of the second normally open contact 13 of the first contactor KM1 is connected to the outgoing phase line of the AC incoming line switch QF1, and the other end is connected to the busbar.

[0048] The AC two-way incoming switch QF2 connects to the three phase lines of a three-phase power supply. Between two of the three phase lines, the coil of the AC two-way contactor K2 and the first normally closed contact 101 of the AC one-way contactor K1 are connected in series. One end of the coil of the second contactor KM2 is connected to the neutral (N) line, and the other end is connected in series with the first simulated fault switch HZ1, the second normally closed contact 102 of the AC one-way contactor K1, and the first normally closed contact 11 of the first contactor KM1, before connecting to the outgoing phase line of the AC two-way incoming switch QF2. The second simulated fault switch HZ2 is connected in parallel with the second normally closed contact 102 of the AC one-way contactor K1. One end of the normally open contact 201 of the AC two-way contactor K2 is connected to the outgoing phase line of the AC two-way incoming switch QF2, and the other end is connected to the busbar.

[0049] One embodiment of this utility model's urban rail transit AC / DC operation training circuit also includes an AC incoming line switch QF3. One end of the AC incoming line switch QF3 is connected to the busbar, and the other end is connected to the emergency lighting circuit.

[0050] One embodiment of this utility model's urban rail transit AC / DC operation training circuit further includes a DC circuit, an AC circuit contactor K3, and a third simulated fault switch HZ3. One end of the coil of the AC circuit contactor K3 is connected to the busbar via an AC input switch QF3, and the other end is connected to the neutral (N) line. The DC circuit includes a modular AC input switch QF4, a power transmitter MK, a DC input switch QF5, a fifth contactor KM5, and a sixth contactor KM6. One end of the modular AC input switch QF4 is connected to the busbar, and the other end is connected to the AC input terminal of the power transmitter MK. The power transmitter MK converts AC power to DC power. The DC input switch QF5 connects to the positive and negative terminals of the DC output terminal of the power transmitter MK. The second normally closed contact 23 of the second contactor KM2, the normally closed contact 301 of the AC circuit contactor K3, and the coil of the sixth contactor KM6 are connected in series, and then connected in parallel with the first normally open contact 65 of the sixth contactor KM6 and the coil of the fifth contactor KM5. One end is connected to the positive terminal of the DC output of the power transmitter MK via the DC input switch QF5, and the other end is connected to the emergency lighting circuit via the second normally open contact 62, the third normally open contact 63, and the fourth normally open contact 64 of the sixth contactor KM6, which are connected in series. The second normally closed contact 14 of the first contactor KM1 is connected in parallel across the two ends of the second normally closed contact 23 of the second contactor KM2. The first normally open contact 52, the second normally open contact 53, and the third normally open contact 54 of the fifth contactor KM5 are respectively connected between the positive terminal of the DC output of the power transmitter MK and the emergency lighting circuit. The third analog fault switch HZ3 is connected at one end to the negative terminal of the DC output of the power transmitter MK via the DC input switch QF5, and at the other end to the emergency lighting circuit.

[0051] One embodiment of the urban rail transit AC / DC operation training circuit of this utility model further includes a third contactor KM3 and a fourth contactor KM4. The coils of the third contactor KM3 and the fourth contactor KM4 are connected in parallel. One end is connected to the output terminal of the AC incoming switch QF3 via the normally closed contact 61 of the sixth contactor KM6 and the normally closed contact 51 of the fifth contactor KM5, which are connected in series. The other end is connected to the emergency lighting circuit via the normally open contact 41 of the fourth contactor KM4. The first normally open contact 31, the second normally open contact 32, and the third normally open contact 33 of the third contactor KM3 are respectively connected between the output terminal of the AC incoming switch QF3 and the emergency lighting circuit.

[0052] One embodiment of the present invention further includes a DC circuit working indicator light 6RD. The DC circuit working indicator light 6RD is connected in series with the fifth normally open contact 66 of the sixth contactor KM6, and then in parallel with the second normally closed contact 23 of the second contactor KM2, the normally closed contact 301 of the AC circuit contactor K3, and the coil of the sixth contactor KM6. One end is connected to the positive terminal of the DC output terminal of the power transmitter MK via the DC input switch QF5, and the other end is connected to the negative terminal of the DC output terminal of the power transmitter MK via the third analog fault switch HZ3.

[0053] The AC line also includes the AC line working indicator light 3RD. The AC line working indicator light 3RD is connected in series with the first normally open contact 12 of the first contactor KM1, and in parallel with the coil of the first contactor KM1, the first normally closed contact 21 of the second contactor KM2, and the normally open contact 103 of the AC line contactor K1, and then connected between the phase line and the neutral line on the outgoing side of the AC line incoming switch QF1;

[0054] The AC circuit 2 also includes the AC circuit 2 working indicator light 4RD. The AC circuit 2 working indicator light 4RD is connected in series with the normally open contact 22 of the second contactor KM2, and in parallel with the coil of the second contactor KM2 (connected in series), the first simulated fault switch HZ1, the second normally closed contact 102 of the AC circuit 1 contactor K1, and the first normally closed contact 11 of the first contactor KM1. It is then connected between the phase line and the neutral line on the outgoing side of the AC circuit 2 incoming switch QF2.

[0055] The AC line also includes three-phase current indicator lights 1HD, 1LD, and 1RD, which are connected between the phase line and the neutral line on the outgoing side of the AC line incoming switch QF1.

[0056] The AC circuit 2 also includes three-phase current indicator lights 2HD, 2LD, and 2RD, which are connected between the phase line and the neutral line on the outgoing side of the AC circuit 2 incoming switch QF2.

[0057] This utility model's embodiment of an AC / DC operation training circuit for urban rail transit further includes multiple fuses, respectively disposed in AC circuit 1, AC circuit 2, and DC circuit. In one embodiment, there are 12 fuses, designated FU1 to FU12, and their placement within the circuit can be found in [reference needed]. Figure 1 As shown, it is used to protect the circuit from damage caused by overload and short-circuit current.

[0058] This utility model discloses an embodiment of an AC / DC operation training circuit for urban rail transit. Current transformers LHa / 2LHa, LHb / 2LHb, and LHc / 2LHc are connected between AC circuit 1, AC circuit 2, and the busbar. The three-phase current values ​​are detected by ammeter A. (See attached diagram) Figure 2 A current transformer is an instrument that measures current by converting a large primary current into a small secondary current based on the principle of electromagnetic induction.

[0059] An embodiment of the present invention includes an emergency lighting circuit comprising emergency lighting indicator lights HD1, HD2, and HD3 connected to the busbar.

[0060] This invention can also utilize a voltage switching switch 2CK, see [link / reference] Figure 3 This involves changing the AC voltage level or power path of a three-phase power supply.

[0061] In one embodiment of this utility model, an AC / DC operation training circuit for urban rail transit is set up inside a hexahedral device, and the arrangement of each component is as follows: Figure 4 As shown.

[0062] When no fault settings are configured, the first simulated fault switch HZ1 is closed, the second simulated fault switch HZ2 is open, and the third simulated fault switch HZ3 is closed.

[0063] Under normal circumstances, emergency lighting adopts the strategy of "priority of AC circuit 1 and backup of AC circuit 2".

[0064] The specific operation for supplying power to one AC circuit is as follows:

[0065] Closing the AC input switch QF1 energizes AC line one, illuminating the three-phase current indicator lights 1HD, 1LD, and 1RD connected in series with fuses FU1-FU3. Simultaneously, the coil of contactor K1 connected between FU1 and FU3 is energized, closing the normally open contact 103 of contactor K1. This energizes the coil of the first contactor KM1, closing its first normally open contact 12, and illuminating the AC line one working indicator light 3RD, indicating that AC line one is operational. Simultaneously, the first normally closed contact 101 of contactor K1 connected between fuses FU4 and FU6 in AC line two opens, de-energizing the coil of contactor K2 in AC line two, thus blocking AC line two from being supplied to the busbar. Subsequently, AC power from the first AC circuit flows through the busbar, through the closure of AC incoming switch QF3 and fuses FU9-11, energizing the coils of the third contactor KM3 and the fourth contactor KM4. This causes the first normally open contact 31, the second normally open contact 32, and the third normally open contact 33 of the third contactor KM3 to close, and the normally open contact 41 of the fourth contactor KM4 to close. As a result, the current from the first normally open contact 31, the second normally open contact 32, the third normally open contact 33 of the third contactor KM3 and the normally open contact 41 of the fourth contactor KM4 flows to the emergency lighting circuits QK1, QK2, and QK3, illuminating the emergency lighting indicator lights HD1, HD2, and HD3, thus completing the power supply to the downstream emergency lighting circuits.

[0066] The specific operation for AC dual-circuit power supply is as follows:

[0067] When AC line 1 loses power or the AC line 1 incoming switch QF1 is opened, the coil of contactor K1 in AC line 1 is de-energized, and the first normally closed contact 101 of contactor K1 in AC line 2 closes, energizing the coil of contactor K2 in AC line 2. The normally open contact 201 of contactor K2 in the main circuit of AC line 2 closes, and AC line 2 then completes the power supply to the downstream emergency lighting following the subsequent path of AC line 1. Simultaneously, the coil of the first contactor KM1 in AC line 1 is de-energized, and the first normally closed contact 11 of contactor KM1 closes. The coil of the second contactor KM2 is energized, and the normally open contact 22 of contactor KM2 closes. The AC line 2 working indicator light 4RD illuminates, indicating that the operation has switched to AC line 2.

[0068] If AC power is restored after AC power is supplied from AC circuit 1 while AC circuit 2 is on standby, the specific details are as follows:

[0069] When AC power is restored to AC circuit 1, the coil of contactor K1 is energized again. At the same time, the states of the first normally closed contact 101, the second normally closed contact 102, and the normally open contact 103 of contactor K1 change, causing the coil of contactor K2 to be de-energized, the AC circuit 2 output circuit to be disconnected, the coil of contactor KM2 to be de-energized, the first normally closed contact 21 of contactor KM2 to be closed, the coil of contactor KM1 to be energized, and the second normally open contact 13 of contactor KM1 to be closed, completing the switching process from AC circuit 2 to AC circuit 1.

[0070] The specific details of the AC 1st and 2nd channel blocking DC circuits are as follows:

[0071] When either AC circuit 1 or 2 is working, the coil of AC circuit contactor K3 in the main output circuit is energized, and the normally closed contact 301 of AC circuit contactor K3 in the DC circuit is opened, so the coil of sixth contactor KM6 is not energized. Therefore, the coils of sixth contactor KM6 and fifth contactor KM5 cannot be energized, and DC cannot be output.

[0072] The emergency lighting circuit was changed to a DC power supply as follows:

[0073] Disconnect the AC incoming switch QF3 in the AC main circuit and close the AC incoming switch QF4 in the DC circuit module. The three-phase AC power in the AC main circuit is converted to DC power via the power transmitter MK. This DC power is then transferred through the closing of the DC incoming switch QF5, through the second normally closed contact 14 of the first contactor KM1, and the second normally closed contact 23 of the second contactor KM2 (the corresponding contact closes when one of the AC circuits loses power), and through the normally closed contact 301 of the AC circuit contactor K3 (because the AC incoming switch QF3 has been opened, the coil of the AC circuit contactor K3 is de-energized, and the AC circuit...). (The normally closed contact 301 of the circuit contactor K3 remains closed, energizing the coil of the sixth contactor KM6. The first normally open contact 65 and the fifth normally open contact 66 of the sixth contactor KM6 close, simultaneously energizing the coil of the fifth contactor KM5. The first normally open contact 52, the second normally open contact 53, and the third normally open contact 54 of the fifth contactor KM5 close, and the second normally open contact 62, the third normally open contact 63, and the fourth normally open contact 64 of the sixth contactor KM6 close, completing the DC power supply to the downstream emergency lighting, and the DC circuit working indicator light 6RD lights up, indicating that the DC output is working.

[0074] The AC / DC switching methods are as follows:

[0075] Under normal circumstances, disconnect the module's AC incoming switch QF4 and DC incoming switch QF5, and the emergency lighting will be powered by AC line one as the primary line and AC line two as the backup line.

[0076] If AC circuit 1 and AC circuit 2 lose power, the interlock switch will complete the emergency lighting power supply.

[0077] To switch the emergency lighting to DC power, disconnect the AC incoming switch QF3 and close the module AC incoming switch QF4 and DC incoming switch QF5. When AC power is supplied from one or two AC sources, the AC is converted to DC through the power transmitter MK to supply power to the downstream emergency lighting.

[0078] When performing a fault simulation, the following operations can be performed:

[0079] 1) When AC line 1 is working normally, disconnect the first simulated fault switch HZ1 (HZ1 is closed when normal). When AC line 1 loses power, it will be impossible to switch from AC line 1 to AC line 2.

[0080] 2) When the AC dual-channel operation has been switched, closing the second simulated fault switch HZ2 (normally HZ1 is closed and HZ2 is open) will prevent the automatic switchback to AC single-channel power supply priority when AC single-channel power is supplied.

[0081] 3) When the AC to DC power supply has been switched, disconnect the third simulated fault switch HZ3 (HZ3 is normally closed). The DC circuit will not work and the emergency lighting will have no output.

[0082] Through fault simulations of HZ1, HZ2, and HZ3, trainees can systematically master the automatic switching logic of AC / DC systems, the diagnostic methods for typical faults, and the operational procedures for emergency response (steps for manual intervention and mode switching).

[0083] It should be noted that, in this application, unless otherwise expressly specified and limited, terms such as "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In addition, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0084] This utility model has the following beneficial effects:

[0085] 1) The AC / DC operation training circuit of this utility model can accurately reproduce the core circuit logic of the urban rail transit accident lighting system. It covers key modules such as AC dual power supply secondary wiring, AC self-cutting, AC dual-circuit interlocking, AC / DC switching, and fault lighting control. It is highly consistent with the circuit architecture in actual operation. Moreover, the equipment is centrally designed and easy to operate, which can help trainees establish an understanding of the overall system structure.

[0086] 2) The AC / DC operation training circuit for urban rail transit of this utility model can safely simulate typical fault scenarios such as switching failure, circuit disconnection, and interlock logic failure. It does not require operation in a real system, avoiding equipment damage or safety risks, and provides trainees with a safe and controllable fault handling training environment. Trainees can master core skills such as fault diagnosis and recovery through hands-on training, effectively improving their understanding of AC / DC control circuits and emergency response capabilities.

[0087] 3) The AC / DC operation training circuit for urban rail transit of this utility model can intuitively display the current path, contactor status and fault location through indicator lights. With the help of instruments such as ammeters, it can make the abstract circuit logic more concrete and help trainees quickly understand the system operation rules and fault causes.

[0088] The embodiments described above are merely further illustrations of the present invention and are not intended to limit the present invention in any other way. The present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and changes based on the present invention, but all such modifications and changes should fall within the protection scope of the present invention.

Claims

1. A training circuit for AC / DC operation of urban rail transit, characterized in that, Includes AC circuit 1 and AC circuit 2 configured as interlocked standby, busbars connected to AC circuit 1 and AC circuit 2, emergency lighting circuits connected to the busbars, a first simulated fault switch, and a second simulated fault switch; AC Line 1 includes AC Line 1 incoming switch, AC Line 1 contactor, and first contactor; AC Line 2 includes AC Line 2 incoming switch, AC Line 2 contactor, and second contactor. An AC input line switch connects to the three phase lines of a three-phase power supply, and an AC contactor coil is connected between two of the three phase lines. One end of the first contactor coil is connected to the N line, and the other end is connected in series with the first normally closed contact of the second contactor and the normally open contact of the AC one-way contactor, and then connected to the outgoing phase line of the AC one-way incoming line switch. One end of the second normally open contact of the first contactor is connected to the phase line on the outgoing side of the AC incoming line switch, and the other end is connected to the busbar. The AC two-way incoming line switch connects to the three phase lines of the three-phase power supply. Between two of the three phase lines, there is a series connection of the AC two-way contactor coil and the first normally closed contact of the AC one-way contactor. One end of the second contactor coil is connected to the N line, and the other end is connected in series with the first simulated fault switch, the second normally closed contact of AC contactor one, and the first normally closed contact of the first contactor, and then connected to the phase line of the outgoing side of the AC two incoming line switch. The second simulated fault switch is connected in parallel with the second normally closed contact of AC contactor one. One end of the normally open contact of the AC two-way contactor is connected to the phase line on the outgoing side of the AC two-way incoming switch, and the other end is connected to the busbar.

2. The urban rail transit AC / DC operation training circuit according to claim 1, characterized in that, It also includes an AC incoming line switch, one end of which is connected to the busbar and the other end is connected to the emergency lighting circuit.

3. The urban rail transit AC / DC operation training circuit according to claim 2, characterized in that, It also includes DC circuit, AC circuit contactor, and third simulated fault switch; One end of the contactor coil in the AC circuit is connected to the busbar via the AC incoming switch, and the other end is connected to the N line; The DC circuit includes a modular AC input switch, a power transmitter, a DC input switch, a fifth contactor, and a sixth contactor; One end of the module's AC incoming line switch is connected to the busbar, and the other end is connected to the AC input terminal of the power transmitter; The power transmitter converts alternating current (AC) into direct current (DC). The DC input switch connects the positive and negative terminals of the DC output terminal of the power transmitter; The second normally closed contact of the second contactor, the normally closed contact of the AC circuit contactor, and the coil of the sixth contactor are connected in series and then connected in parallel with the first normally open contact of the sixth contactor and the coil of the fifth contactor. One end is connected to the positive terminal of the DC output terminal of the power transmitter via a DC input switch, and the other end is connected to the emergency lighting circuit. The second normally closed contact of the first contactor is connected in parallel across the two ends of the second normally closed contact of the second contactor. The first normally open contact, the second normally open contact, and the third normally open contact of the fifth contactor are respectively connected between the positive terminal of the DC output of the power transmitter and the emergency lighting circuit. One end of the third simulated fault switch is connected to the negative terminal of the DC output of the power transmitter via a DC input switch, and the other end is connected to the emergency lighting circuit.

4. The urban rail transit AC / DC operation training circuit according to claim 3, characterized in that, It also includes the third and fourth contactors; After the third and fourth contactor coils are connected in parallel, one end is connected to the output terminal of the AC incoming line switch via the normally closed contacts of the sixth and fifth contactors connected in series, and the other end is connected to the emergency lighting circuit via the normally open contact of the fourth contactor. The first, second, and third normally open contacts of the third contactor are respectively connected between the output terminal of the AC incoming line switch and the emergency lighting circuit.

5. The urban rail transit AC / DC operation training circuit according to claim 3, characterized in that, The DC circuit also includes a DC circuit operation indicator light; The DC circuit working indicator light is connected in series with the fifth normally open contact of the sixth contactor, and then connected in parallel with the second normally closed contact of the second contactor, the normally closed contact of the AC circuit contactor, and the coil of the sixth contactor. One end is connected to the positive terminal of the DC output terminal of the power transmitter via the DC input switch, and the other end is connected to the negative terminal of the DC output terminal of the power transmitter via the third analog fault switch.

6. The urban rail transit AC / DC operation training circuit according to claim 3, characterized in that, It also includes multiple fuses, which are respectively installed in AC circuit 1, AC circuit 2, and DC circuit.

7. The urban rail transit AC / DC operation training circuit according to claim 1, characterized in that, The AC line also includes an AC line working indicator light. The AC line working indicator light is connected in series with the first normally open contact of the first contactor, and is connected in parallel with the first contactor coil, the first normally closed contact of the second contactor, and the normally open contact of the AC line contactor. It is then connected between the phase line and the N line on the outgoing side of the AC line incoming switch. The AC circuit 2 also includes an AC circuit 2 working indicator light. The AC circuit 2 working indicator light is connected in series with the normally open contact of the second contactor, and is connected in parallel with the second contactor coil, the first simulated fault switch, the second normally closed contact of the AC circuit 1 contactor, and the first normally closed contact of the first contactor. It is then connected between the phase line and the N line on the outgoing side of the AC circuit 2 incoming line switch.

8. The urban rail transit AC / DC operation training circuit according to claim 1, characterized in that, AC line 1 also includes a three-phase current indicator light, which is connected between the phase line and the neutral line on the outgoing side of the AC line 1 incoming switch; The AC circuit 2 also includes a three-phase current indicator light, which is connected between the phase line and the neutral line on the outgoing side of the AC circuit 2 incoming switch.

9. The urban rail transit AC / DC operation training circuit according to claim 1, characterized in that, Current transformers are connected between AC circuit 1, AC circuit 2 and the busbar, and the three-phase current values ​​are detected by ammeters.

10. The urban rail transit AC / DC operation training circuit according to any one of claims 1-9, characterized in that, The emergency lighting circuit includes emergency lighting indicator lights connected to the busbar.

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