Rail vehicle and alternating current leakage detection system thereof

Abstract

The application discloses a rail vehicle and an alternating current leakage detection system thereof, and belongs to the field of rail vehicles, and is used for positioning a power supply unit with a leakage fault on the rail vehicle. In consideration of the fact that a leakage current flows back to a zero line from the ground, an auxiliary zero line and a plurality of switching switches are arranged in the embodiment of the application. The auxiliary zero line is connected with the zero line in each high-voltage bus section through the switching switch corresponding to the high-voltage bus section. In this case, the plurality of isolation devices are all controlled to be disconnected so as to make each power supply unit work independently, and then one of the switching switches is controlled to be closed in turn. At this time, the leakage current detected is the leakage current of the power supply unit corresponding to the closed switching switch, so that the leakage fault detection of all power supply units of the whole vehicle can be realized by using one alternating current leakage detection device, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of rail vehicles, and in particular to an AC leakage current detection system. This invention also relates to a rail vehicle. Background Technology

[0002] For redundant power supply, rail vehicles (such as EMUs) are usually equipped with multiple power supply units connected to the grid to supply power to the auxiliary loads of the vehicle. Currently, an AC leakage current detection device can be installed in each power supply unit. Therefore, when locating AC leakage current faults in rail vehicles, the detection results of the AC leakage current detection device corresponding to each power supply unit can be used to locate the AC leakage current fault. However, as the number of rail vehicle cars increases, the number of power supply units on rail vehicles increases, and correspondingly, more AC leakage current detection devices need to be installed, which increases the cost.

[0003] Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide an AC leakage current detection system that can detect leakage current faults in all power supply units of a vehicle using a single AC leakage current detection device, thereby reducing costs. Another purpose of this invention is to provide a rail vehicle that includes the above-mentioned AC leakage current detection system, which can detect leakage current faults in all power supply units of the vehicle using a single AC leakage current detection device, thereby reducing costs.

[0005] To solve the above-mentioned technical problems, the present invention provides an AC leakage current detection system, comprising: multiple isolation devices, multiple switching switches, an auxiliary neutral wire, an AC leakage current detection device, and a control device;

[0006] The isolation device is installed between the high-voltage busbars of two adjacent power supply units on the rail vehicle to divide the high-voltage busbar into multiple sections; the first end of each switching switch is connected to the neutral wire of the high-voltage busbar section where the power supply unit is located, and the second end of each switching switch is connected to the auxiliary neutral wire; the AC leakage current detection device is connected to the auxiliary neutral wire and the ground wire of the rail vehicle respectively to detect leakage current.

[0007] The control device is used to sequentially and individually close one of the switching switches when all the isolation devices are disconnected, and to detect whether there is a leakage fault in the power supply unit corresponding to the closed switching switch by means of the leakage current.

[0008] Preferably, before controlling one of the switching switches to close sequentially and individually, and determining whether there is a leakage fault in the power supply unit corresponding to the closed switching switch by using the leakage current, the control device is further configured to:

[0009] All the isolation devices are closed, and any one of the switching switches is closed. The leakage current is used to determine whether there is a leakage fault in the entire rail vehicle. If there is a leakage fault, the following steps are performed: with all the isolation devices open, one of the switching switches is closed sequentially, and the leakage current is used to determine whether there is a leakage fault in the power supply unit corresponding to the closed switching switch.

[0010] Preferably, the isolation device includes a plurality of first isolation switches and a plurality of second isolation switches;

[0011] The first disconnecting switch is installed between the three-phase live wires of two adjacent power supply units on the rail vehicle, and the second disconnecting switch is installed between the neutral wires of two adjacent power supply units on the rail vehicle.

[0012] The control device is also used to disconnect the first isolating switches on both sides of the power supply unit with leakage fault, control all second isolating switches to close, and control any of the switching switches to perform the step of determining whether the entire rail vehicle has leakage fault by means of the leakage current.

[0013] Preferably, the AC leakage current detection device includes an AC leakage current detection device body and an auxiliary busbar;

[0014] Each of the switching switches is also connected to the live wire of its unique power supply and the auxiliary bus, and the auxiliary bus is connected to the power supply terminal of the AC leakage current detection device.

[0015] The switching switch is specifically used to, under the control of the control device, simultaneously connect or disconnect the electrical connection between its corresponding high-voltage bus and the auxiliary bus, as well as between its corresponding neutral line and the auxiliary neutral line.

[0016] Preferably, the AC leakage current detection system also includes an indicator;

[0017] The control device is also used to, when it is determined that there is a leakage fault in the entire rail vehicle, control the indicator to indicate that there is a leakage fault in the rail vehicle, and control the indicator to indicate the power supply unit that has been identified as having a leakage fault.

[0018] Preferably, the AC leakage current detection system also includes an alarm;

[0019] The control device is also used to control the alarm to sound after determining that the power supply unit has a leakage fault.

[0020] Preferably, the first disconnecting switch, the second disconnecting switch, and the switching switch are all contactors.

[0021] Preferably, the control device is a Train Control and Management System (TCMS).

[0022] Preferably, the AC leakage current detection device includes a main leakage current detection device and a backup leakage current detection device;

[0023] The control device is also used to, when the current primary leakage current detection device fails, switch the roles of the current primary leakage current detection device and the backup leakage current detection device, and control the current primary leakage current detection device to connect to the AC leakage current detection system.

[0024] To address the aforementioned technical problems, the present invention also provides a rail vehicle, including the AC leakage current detection system described above.

[0025] This invention provides an AC leakage current detection system. Considering that leakage current flows back from the ground to the neutral wire, an auxiliary neutral wire and multiple switching switches are provided in this embodiment. The auxiliary neutral wire can be connected to the neutral wire in each high-voltage bus section through a switching switch corresponding to each high-voltage bus section. In this case, multiple isolation devices can be controlled to disconnect, so that each power supply unit can work independently. Then, one of the switching switches can be controlled to close in sequence. The leakage current detected at this time is the leakage current of the power supply unit corresponding to the closed switching switch. Thus, a single AC leakage current detection device can be used to detect leakage faults in all power supply units of the vehicle, reducing costs.

[0026] The present invention also provides a rail vehicle that has the same beneficial effects as the AC leakage current detection system described above. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an AC leakage current detection system provided by the present invention;

[0029] Figure 2This is a schematic diagram of another AC leakage current detection system provided by the present invention. Detailed Implementation

[0030] The core of this invention is to provide an AC leakage current detection system, which can use one AC leakage current detection device to detect leakage current faults in all power supply units of the vehicle, thereby reducing costs. Another core aspect of this invention is to provide a rail vehicle that includes the above-mentioned AC leakage current detection system, which can use one AC leakage current detection device to detect leakage current faults in all power supply units of the vehicle, thereby reducing costs.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please refer to Figure 1 , Figure 1 This is a schematic diagram of an AC leakage current detection system provided by the present invention. The AC leakage current detection system includes: multiple isolation devices 1, multiple switching switches 2, an auxiliary neutral wire 3, an AC leakage current detection device 4, and a control device 5.

[0033] Isolation device 1 is installed between the high-voltage busbars of two adjacent power supply units on the rail vehicle to divide the high-voltage busbars into multiple sections; the first end of each switching switch 2 is connected to the neutral wire of the high-voltage busbar section where its corresponding power supply unit is located, and the second end of each switching switch 2 is connected to the auxiliary neutral wire 3. The AC leakage current detection device 4 is connected to the auxiliary neutral wire 3 and the ground wire of the rail vehicle respectively to detect leakage current.

[0034] The control device 5 is used to sequentially and individually control one of the switching switches 2 to close when all isolation devices 1 are disconnected, and to detect whether there is a leakage fault in the power supply unit corresponding to the closed switching switch 2 by means of leakage current.

[0035] Specifically, considering the technical problems mentioned above, and taking into account that leakage current will flow back from the ground to the neutral line, it is necessary to ensure the isolation of the high-voltage bus of the power supply unit under test, and connect the AC leakage detection device 4 separately to the neutral line of the high-voltage bus section where the power supply unit under test is located. At this time, the current between the neutral line and the ground line detected is the leakage current of the power supply unit under test. Therefore, by using relevant devices to realize "connecting the AC leakage detection device 4 separately to the neutral line of each (three-phase live wire isolated) power supply unit", a single AC leakage detection device 4 can be used to detect leakage faults in multiple power supply units. Therefore, the above AC leakage detection system is designed in this embodiment of the invention. The isolation device 1 can isolate the high-voltage bus of each power supply unit so as to detect leakage faults in each power supply unit. The switching switch 2 can selectively connect the neutral line section of one power supply unit to the auxiliary neutral line 3 so as to detect leakage faults in the power supply unit under test by a single AC leakage detection device 4.

[0036] This invention provides an AC leakage current detection system. Considering that leakage current flows back from the ground to the neutral wire, an auxiliary neutral wire and multiple switching switches are provided in this embodiment. The auxiliary neutral wire can be connected to the neutral wire in each high-voltage bus section through a switching switch corresponding to each high-voltage bus section. In this case, multiple isolation devices can be controlled to disconnect, so that each power supply unit can work independently. Then, one of the switching switches can be controlled to close in sequence. The leakage current detected at this time is the leakage current of the power supply unit corresponding to the closed switching switch. Thus, a single AC leakage current detection device can be used to detect leakage faults in all power supply units of the vehicle, reducing costs.

[0037] Based on the above embodiments:

[0038] In a preferred embodiment, with all isolation devices 1 disconnected, the control device 5 sequentially and individually controls one of the switching switches 2 to close, and before determining whether there is a leakage fault in the power supply unit corresponding to the closed switching switch 2 by measuring the leakage current, the control device 5 is further configured to:

[0039] All isolation devices 1 are closed, and any one switching switch 2 is closed. The leakage current is used to determine whether there is a leakage fault in the entire rail vehicle. If there is, the following steps are performed: with all isolation devices 1 open, one switching switch 2 is closed in sequence, and the leakage current is used to determine whether there is a leakage fault in the power supply unit corresponding to the closed switching switch 2.

[0040] Specifically, considering that blindly performing leakage detection on each power supply unit in the absence of an AC leakage fault would increase the workload of each device and thus increase the maintenance rate, this embodiment of the invention can first determine whether there is a leakage fault in the whole vehicle. Only when there is a leakage fault in the whole vehicle will each power supply unit be cyclically detected for fault location. Specifically, closing all isolation devices 1 can connect all high-voltage busbars and control any switch 2 to close. At this time, as long as there is a leakage fault in the whole vehicle, the AC leakage detection device 4 can detect the leakage current, thereby determining that there is a leakage fault in the whole vehicle. Then, the leakage fault of each power supply unit is cyclically determined, without the need to frequently control each switch 2, thus reducing the maintenance rate of the switch 2.

[0041] In a preferred embodiment, the isolation device 1 includes a plurality of first isolation switches 11 and a plurality of second isolation switches 12;

[0042] The first disconnecting switch 11 is installed between the three-phase live wires of two adjacent power supply units on the rail vehicle, and the second disconnecting switch 12 is installed between the neutral wires of two adjacent power supply units on the rail vehicle.

[0043] The control device 5 is also used to disconnect the first disconnecting switch 11 on both sides of the power supply unit with leakage fault, control all second disconnecting switches 12 to close, and control any switching switch 2 to close and perform the step of judging whether the entire rail vehicle has leakage fault by the leakage current.

[0044] Specifically, considering that after locating the faulty power supply unit, it is necessary to isolate the faulty power supply unit when making a new judgment on the leakage fault of the whole vehicle, the isolation in this embodiment of the invention includes a first isolating switch 11 for isolating the three-phase live wire and a second isolating switch 12 for isolating the neutral wire. In this way, after locating the faulty power supply unit, the faulty power supply unit can be isolated by disconnecting the first isolating switches 11 on both sides of the faulty power supply unit (and controlling the power supply unit to stop output), and all the second isolating switches 12 can be closed so as to make a new judgment on whether there is a leakage fault in the whole vehicle.

[0045] In a preferred embodiment, the AC leakage current detection device 4 includes an AC leakage current detection device 4 body and an auxiliary busbar 6;

[0046] Each switch 2 is also connected to the live wire of its unique power supply and the auxiliary bus 6. The auxiliary bus 6 is connected to the power supply terminal of the AC leakage current detection device 4.

[0047] The switching switch 2 is specifically used to simultaneously connect or disconnect the electrical connection between its corresponding high-voltage bus and auxiliary bus 6, and between its corresponding neutral line and auxiliary neutral line 3, under the control of the control device 5.

[0048] Specifically, in order to facilitate the power supply of the AC leakage current detection device 4, an auxiliary bus 6 can be set in this embodiment of the invention so that the electrical energy of any phase of the three-phase four-wire high-voltage bus can be introduced into the auxiliary bus 6 so as to power the AC leakage current detection device 4 through the auxiliary bus 6.

[0049] Of course, in addition to this power supply method, the power supply of the AC leakage current detection device 4 can also be of other types, and this embodiment of the invention does not limit it here.

[0050] As a preferred embodiment, the AC leakage current detection system also includes an indicator;

[0051] The control device 5 is also used to, when it is determined that there is a leakage fault in the entire rail vehicle, prompt the control indicator to indicate that there is a leakage fault in the rail vehicle, and prompt the power supply unit that has been identified as having a leakage fault.

[0052] Specifically, in order to facilitate timely information access and repair by staff when a leakage fault is detected, this embodiment of the invention can, when a leakage fault is detected in the entire rail vehicle, prompt the control device to indicate that a leakage fault exists in the rail vehicle, and the control device will indicate the power supply unit where the leakage fault is identified.

[0053] The prompt can be of various types, such as a display, and this embodiment of the invention does not limit it.

[0054] In a preferred embodiment, the AC leakage current detection system also includes an alarm;

[0055] The control device 5 is also used to control the alarm to sound after a power supply unit with a leakage fault is identified.

[0056] Specifically, in order to facilitate timely notification of staff when a leakage fault is identified, this embodiment of the invention includes an alarm. The control device 5 can activate the alarm after a power supply unit with a leakage fault is identified, so as to promptly notify the staff.

[0057] The alarm can be of various types, such as a buzzer, etc., and this embodiment of the invention does not limit it.

[0058] In a preferred embodiment, the first disconnecting switch 11, the second disconnecting switch 12, and the switching switch 2 are all contactors.

[0059] Specifically, contactors have advantages such as long lifespan, high safety, and low cost.

[0060] Of course, in addition to the contactor, the first disconnecting switch 11, the second disconnecting switch 12, and the switching switch 2 can all be other types, and this embodiment of the invention does not limit them.

[0061] In a preferred embodiment, the control device 5 is a TCMS (Train Control and Monitoring System).

[0062] Specifically, TCMS is a device that is inherent to rail vehicles and has high stability.

[0063] Of course, in addition to TCMS, the control device 5 can be of many other types, and this embodiment of the invention does not limit it.

[0064] In a preferred embodiment, the AC leakage current detection device 4 includes a main leakage current detection device and a backup leakage current detection device;

[0065] The control device 5 is also used to, when the current primary leakage current detection device fails, switch the roles of the current primary leakage current detection device and the backup leakage current detection device, and control the current primary leakage current detection device to connect to the AC leakage current detection system.

[0066] Specifically, considering the possibility of malfunction of the AC leakage current detection device 4 itself, once the AC leakage current detection device 4 malfunctions, AC leakage current detection will be immediately impossible. Therefore, in this embodiment of the invention, a redundant AC leakage current detection device 4 is provided. When the primary AC leakage current detection device 4 malfunctions, the backup AC leakage current detection device 4 can be immediately activated, and the roles of the current primary leakage current detection device and the backup leakage current detection device can be swapped. The current primary leakage current detection device can be controlled to connect to the AC leakage current detection system.

[0067] Among them, the backup AC leakage current detection device 4 can be in hot standby mode so that it can be connected to the system in a timely manner.

[0068] The present invention also provides a rail vehicle including the AC leakage current detection system described above.

[0069] For an introduction to the rail vehicle provided in the embodiments of the present invention, please refer to the aforementioned embodiments of the AC leakage current detection system; the embodiments of the present invention will not be repeated here.

[0070] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should also be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An AC leakage current detection system, characterized in that, include: Multiple isolation devices, multiple switching switches, auxiliary neutral wire, AC leakage current detection device, and control device; The isolation device is installed between the high-voltage busbars of two adjacent power supply units on the rail vehicle to divide the high-voltage busbar into multiple sections; the first end of each switching switch is connected to the neutral wire of the high-voltage busbar section where the power supply unit is located, and the second end of each switching switch is connected to the auxiliary neutral wire; the AC leakage current detection device is connected to the auxiliary neutral wire and the ground wire of the rail vehicle respectively to detect leakage current. The control device is used to sequentially and individually close one of the switching switches when all the isolation devices are disconnected, and to detect whether there is a leakage fault in the power supply unit corresponding to the closed switching switch by means of the leakage current.

2. The AC leakage current detection system according to claim 1, characterized in that, Before, while all the isolation devices are disconnected, the control device sequentially and individually closes one of the switching switches, and determines whether the power supply unit corresponding to the closed switching switch has a leakage fault based on the leakage current, the control device is further configured to: All the isolation devices are closed, and any one of the switching switches is closed. The leakage current is used to determine whether there is a leakage fault in the entire rail vehicle. If there is a leakage fault, the following steps are performed: with all the isolation devices open, one of the switching switches is closed sequentially, and the leakage current is used to determine whether there is a leakage fault in the power supply unit corresponding to the closed switching switch.

3. The AC leakage current detection system according to claim 2, characterized in that, The isolation device includes a plurality of first isolation switches and a plurality of second isolation switches; The first disconnecting switch is installed between the three-phase live wires of two adjacent power supply units on the rail vehicle, and the second disconnecting switch is installed between the neutral wires of two adjacent power supply units on the rail vehicle. The control device is also used to disconnect the first isolating switches on both sides of the power supply unit with leakage fault, control all second isolating switches to close, and control any of the switching switches to perform the step of determining whether the entire rail vehicle has leakage fault by means of the leakage current.

4. The AC leakage current detection system according to claim 1, characterized in that, The AC leakage current detection device includes an AC leakage current detection device body and an auxiliary busbar; Each of the switching switches is also connected to the live wire of its unique corresponding power supply unit and the auxiliary bus, and the auxiliary bus is connected to the power supply terminal of the AC leakage current detection device. The switching switch is specifically used to, under the control of the control device, simultaneously connect or disconnect the electrical connection between its corresponding high-voltage bus and the auxiliary bus, as well as between its corresponding neutral line and the auxiliary neutral line.

5. The AC leakage current detection system according to claim 3, characterized in that, The AC leakage current detection system also includes an indicator; The control device is also used to, when it is determined that there is a leakage fault in the entire rail vehicle, control the indicator to indicate that there is a leakage fault in the rail vehicle, and control the indicator to indicate the power supply unit that has been identified as having a leakage fault.

6. The AC leakage current detection system according to claim 5, characterized in that, The AC leakage current detection system also includes an alarm; The control device is also used to control the alarm to sound after determining that the power supply unit has a leakage fault.

7. The AC leakage current detection system according to claim 3, characterized in that, The first disconnecting switch, the second disconnecting switch, and the switching switch are all contactors.

8. The AC leakage current detection system according to claim 1, characterized in that, The control device is a Train Control and Management System (TCMS).

9. The AC leakage current detection system according to any one of claims 1 to 8, characterized in that, The AC leakage current detection device includes a main leakage current detection device and a backup leakage current detection device. The control device is also used to, when the current primary leakage current detection device fails, switch the roles of the current primary leakage current detection device and the backup leakage current detection device, and control the current primary leakage current detection device to connect to the AC leakage current detection system.

10. A rail vehicle, characterized in that, Including the AC leakage current detection system as described in any one of claims 1 to 9.

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