Electric segmented arc extinguishing device for railway overhead line system, traction substation and power supply system

Abstract

The utility model provides a railway contact network electric segmentation arc extinguishing device, a traction substation and a power supply system, the railway contact network electric segmentation arc extinguishing device comprises a sectionalizer, cable equipment and switch equipment, the sectionalizer is arranged on a contact network in series, and the switch equipment is connected with the sectionalizer in parallel through the cable equipment. The problem of arc discharge when the electric locomotive passes through the sectionalizer in the prior art can be solved, and the safety and reliability of the overhead line system power supply equipment are improved.

Description

Technical Field

[0001] This application relates to the field of railway traction power supply technology, and more specifically, to a railway overhead contact line segmentation arc suppression device, a traction substation, and a power supply system. Background Technology

[0002] In the field of railway traction power supply technology, regardless of whether it is power frequency AC phase power supply, same phase power supply, bilateral power supply, or through power supply based on same phase power supply technology or bilateral power supply technology, in order to avoid the entire contact network losing power due to a fault, it is necessary to set up electrical sections on the contact network.

[0003] Currently, the power supply lines for the switches in the existing electrical sectionalizing system are all bare wires connected in parallel with the sectionalizing unit. The longer the power supply line, the greater its inductance and reactance. Furthermore, a large gap needs to be maintained between the bare wires to avoid short circuits and maintenance accidents, which reduces mutual inductance and increases the residual equivalent inductance and impedance in the circuit. Under steady-state conditions, the load of the running locomotive will create a voltage difference across the sectionalizing unit. When the locomotive passes through the sectionalizing unit, its load will switch between the two power supply lines, causing transient processes and transient overvoltages, resulting in arcing between the two sections of the sectionalizing unit. Over time, this can easily lead to contact wire burnout, wire breakage, and other accidents, seriously threatening railway equipment and operational safety. To solve the technical problem of contact wire burnout and wire breakage caused by arcing during locomotive switching at the sectionalizing unit, this application proposes a new technical solution. Utility Model Content

[0004] The purpose of this application is to provide a railway catenary electrical segmentation arc suppression device, traction substation and system to solve the arcing problem in the existing technology and improve the safety and reliability of the catenary power supply equipment.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] The first aspect of this application is to provide a railway catenary electrical segmentation arc suppression device, including a segmenter, a cable device, and a switch device. The segmenter is connected in series in the catenary, and the switch device is connected in parallel with the segmenter through the cable device. The cable device includes a first cable and a second cable. The two ends of the segmenter are respectively connected to one end of the first cable and one end of the second cable, and the other end of the first cable is connected to the other end of the second cable through the switch device.

[0007] Furthermore, the first cable is a single-core cable; the second cable is a single-core cable; the first cable and the second cable are arranged closely together.

[0008] Furthermore, the cable equipment also includes a first post, a second post, a first conductor, a second conductor, a first supporting insulator disposed on the first post, and a second supporting insulator disposed on the second post. The cable terminal of the first cable is fixedly installed on the first supporting insulator, and the cable terminal of the second cable is fixedly installed on the second supporting insulator. One end of the first conductor is connected to the cable terminal of the first cable, and one end of the second conductor is connected to the cable terminal of the second cable. The other ends of the first conductor and the other ends of the second conductor are respectively connected to the two ends of the segmenter.

[0009] Furthermore, the cable equipment also includes a third support post, a first conductor, a second conductor, a third support insulator and a fourth support insulator disposed on the third support post, the cable terminal of the first cable is fixedly installed on the third support insulator, the cable terminal of the second cable is fixedly installed on the fourth support insulator, one end of the first conductor is connected to the cable terminal of the first cable, one end of the second conductor is connected to the cable terminal of the second cable, and the other ends of the first conductor and the other ends of the second conductor are respectively connected to the two ends of the segmenter.

[0010] Furthermore, the switching equipment includes a current transformer and a switch connected in series with the primary winding of the current transformer. The current transformer and the switch connected in series are connected in parallel with the sectionalizer through the cable equipment.

[0011] Furthermore, it also includes a current process recorder connected to the secondary winding of the current transformer.

[0012] Furthermore, the switching device is normally closed, and is open during maintenance or in case of a fault.

[0013] Furthermore, when the single-core cable length l of the first cable and the second cable are the same, the single-core cable length l and the center-axis distance d of the first cable and the second cable are... 12 The equivalent radius R of a single-core cable ε The following formula must be satisfied:

[0014]

[0015] In the formula, U T U is the voltage threshold. T The value is the minimum insulation breakdown voltage across the segmenter; L n R is the inductance per unit length of a single-core cable; μ0 is the dielectric constant; R ε d is the equivalent radius of a single-core cable; 12 The distance between the center axes of the first and second cables is [missing information]. for The natural logarithm of ; i1 and i2 are the currents in the first and second cables when the electric locomotive passes through the section separator, respectively; These are the rate of change of cable current when the locomotive passes through the section separator insulation, which is related to the speed of the train passing through.

[0016] A second aspect of this application is to provide a traction substation that supplies power to the contact networks on both sides of the electrical contact network segmentation and arc suppression device through cable equipment in the electrical contact network segmentation and arc suppression device, wherein the traction substation is a phase-independent traction substation.

[0017] A third aspect of this application is to provide a traction power supply system, including the aforementioned traction substation.

[0018] Compared with the prior art, this application has the following main advantages:

[0019] (1) By using cable equipment to connect the sectioner and the switch equipment in parallel, there is no problem of cable equipment being prone to short circuits, which can enhance the reliability of railway power supply and improve the safety during maintenance and fault repair.

[0020] (2) By using cable equipment to connect the sectionalizer and the switch equipment in parallel, the core wires of the two cables can maintain a smaller gap, which makes the mutual inductance between the two cables and the switch larger and cancels out the inductance in the circuit. The remaining equivalent inductance of the circuit is smaller. When the pantograph of the electric locomotive switches the circuit at both ends of the sectionalizer through the electric sectionalizer, the transient process and overvoltage are greatly reduced. The voltage difference at both ends of the sectionalizer is less than the minimum insulation breakdown voltage of the sectionalizer, thereby avoiding arcing and causing accidents such as contact wire burnout and wire breakage, which is beneficial to the safety of railway equipment and operation.

[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, several embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, the same numbers represent the same structures, wherein:

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1A schematic diagram of a railway catenary electrical segmentation arc suppression device provided in this application;

[0025] Figure 2 A schematic diagram of a cable device provided in this application;

[0026] Figure 3 A schematic diagram of another cable device provided in this application;

[0027] Figure 4 A schematic diagram of a traction substation provided in this application;

[0028] Figure 5 This application provides a schematic diagram of a specific traction substation;

[0029] Figure 6 A schematic diagram of another traction substation provided in this application;

[0030] Figure 7 A schematic diagram of a traction power supply system provided in this application.

[0031] Reference numerals: 1—Sectional switch, 2—Switchgear, 201—Switch, 202—Current transformer, 3—Cable equipment, 301—First cable, 302—Second cable, 303—First support post, 304—Second support post, 305—First supporting insulator, 306—Second supporting insulator, 307—Third support post, 308—Third supporting insulator, 309—Fourth supporting insulator, 310—First cable protective sleeve, 311—Second cable protective sleeve, 312—Third cable protective sleeve, 313—Fourth cable protective sleeve, 4—First conductor, 5—Second conductor, 6—Current process recorder, T—Contact wire, S—Traction busbar. Detailed Implementation

[0032] To make the objectives, technical solutions, working principles, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0035] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0036] In the description of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can 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 based on the specific circumstances.

[0037] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0038] Example 1

[0039] like Figure 1As shown, this embodiment provides an arc suppression device for a railway contact network sectioner, including a sectioner 1, a cable device 3, and a switch device 2. The sectioner 1 is connected in series with the contact network T, and the switch device 2 is connected in parallel with the sectioner 1 through the cable device 3. As described in the background art, in the prior art, the switchgear 2 and the sectioner 1 are connected in parallel using bare conductors. To avoid short circuits between the bare conductors (for example, under non-fault conditions, switchgear 2 can be set to normally closed, so that the contact wires on both sides of sectioner 1 are energized; in the event of a fault or maintenance, switchgear 2 is disconnected, so that the contact wires on one side of sectioner 1 are de-energized, thereby ensuring maximum power supply during maintenance or repair; at this time, short circuits between the bare conductors on both sides of sectioner 1 must be absolutely avoided to prevent safety accidents), the spacing between the bare conductors on both sides of sectioner 1 must be set to be large enough. The large spacing between the bare conductors reduces the mutual inductance between them. The residual equivalent inductance (reactance) of the two bare conductor loops will cause a large voltage difference at both ends of the sectioner when the pantograph of the electric locomotive passes through the sectioner, which can easily cause arcing, contact wire burnout, wire breakage and other accidents, seriously threatening the safety of railway equipment and operation. Therefore, in this embodiment, cable device 3 is used to connect switch device 2 and sectionalizer 1 in parallel. The core wires of the two cables can maintain a small gap, increasing the mutual inductance between them. Since mutual inductance and self-inductance can weaken each other, the residual equivalent inductance of the circuit is reduced, which greatly reduces the voltage difference at both ends of the sectionalizer when the pantograph of the electric locomotive passes through the sectionalizer. That is, the voltage difference at both ends of the sectionalizer when the pantograph of the electric locomotive passes through the sectionalizer is less than the minimum insulation breakdown voltage of the sectionalizer, thereby avoiding arcing that could cause contact wire burnout, wire breakage and other accidents.

[0040] As a preferred method, such as Figure 1 As shown, the cable device 3 includes a first cable 301 and a second cable 302. The two ends of the segmenter 1 are connected to one end of the first cable 301 and one end of the second cable 302, respectively. The other end of the first cable 301 is connected to the other end of the second cable 302 via the switchgear 2. Here, the cable device 3 can use two independent cables (such as the first cable 301 and the second cable 302) to achieve a parallel connection between the switchgear 2 and the segmenter 1. Alternatively, a two-core cable, a multi-core cable, or other similar methods can be used. In other solutions, a suitable coaxial cable can also be selected to achieve the parallel connection between the switchgear 2 and the segmenter 1.

[0041] The working principle of this utility model can be explained in conjunction with this embodiment: Taking the first cable 301 and the second cable 302 as single-core cables as an example, assuming that the length and wire diameter of the first cable 301 and the second cable 302 are the same, and that the first cable 301 and the second cable 302 are laid parallel and closely together, then the circuit parameters formed by the two cables and the switch are:

[0042]

[0043] In formula (1), l is the length of a single-core cable; L n R is the unit internal inductance of a single-core cable. ε d is the equivalent radius of a single-core cable; 12 Let L0 be the distance between the center axes of the first cable 301 and the second cable 302, L0 be the self-inductance of the single-core cable, which is proportional to the length l of the single-core cable, and M0 be the mutual inductance between the single-core cables, which is d between the center axes of the first cable 301 and the second cable 302. 12 Negative correlation, spacing d 12 The smaller the value of A, the larger the mutual inductance M0, and the smaller the residual equivalent inductance L0-M0. A is the unit residual equivalent inductance. μ0 is the dielectric constant.

[0044]

[0045] In formula (2), u 12 i1 represents the voltage difference across the sectionalizer when the electric locomotive's pantograph passes through it, and i2 represents the current in the first cable 301 and the second cable 302 when the electric locomotive passes through the sectionalizer, respectively. These represent the rate of change of current in the first cable 301 and the second cable 302 as the locomotive passes the section separator, respectively, and this rate of change of current is related to the speed of the train. In some embodiments, It is positively correlated with the speed at which the train passes.

[0046] To prevent the sectioner from breaking down due to an excessively high voltage difference across its terminals when an electric locomotive passes through it, the voltage difference u across the sectioner needs to be controlled. 12 Controlled to be less than the voltage threshold U T , that is u 12 T Therefore, the following formula can be obtained:

[0047]

[0048] In formula (3), the constants include the voltage threshold U. T Voltage threshold U T The value is the minimum insulation breakdown voltage across the section segment, which can be obtained from the performance parameters of the installed section segment. The constants include the dielectric constant μ0. When the train speed is constant... It is also a constant. The variables include the single-core cable length l of the first cable 301 and the second cable 302, and the center-axis distance d between the first cable 301 and the second cable 302. 12 The equivalent radius R of a single-core cable ε .

[0049] The voltage difference u across the segmenter​12 It is approximately proportional to L0-M0. If L0-M0 approaches 0, then u 12 As the voltage approaches zero, the transient processes and overvoltages during the switching process are greatly reduced. Voltage difference u 12 Less than the minimum insulation breakdown voltage U of the segmenter T This avoids accidents such as contact wire burnout and wire breakage caused by arcing, and is beneficial to the safety of railway equipment and operation.

[0050] From formula (3), the length l of the single-core cable and the center-axis distance d between the first cable 301 and the second cable 302 can be obtained. 12 The equivalent radius R of a single-core cable ε Relationship:

[0051]

[0052] In formula (4), the center-axis distance d between the first cable 301 and the second cable 302 is... 12 The equivalent radius R of a single-core cable ε In other words, The smaller the value, the better. 12 The smaller the value, the less likely it is to reach the voltage threshold U. T Therefore, in actual installation, the first cable 301 and the second cable 302 can be laid parallel and tightly, with the distance between them being zero, i.e., the central axis distance d between the first cable 301 and the second cable 302. 12 R is the equivalent radius of a single-core cable. ε twice that, therefore, d 12 -R ε =R ε , In this case, the only variable remaining is the length l of the single-core cable. Therefore, the control range for the length l of the single-core cable can be obtained, as shown in the following formula:

[0053]

[0054] According to formula (5), the length l of the single-core cable can be controlled within a reasonable range so that the voltage between the two sections of the sectioner does not exceed the minimum insulation breakdown voltage when the train switches tracks.

[0055] As a specific implementation of cable equipment 3, such as Figure 2As shown, the cable device 3 may include a first support post 303, a second support post 304, a first supporting insulator 305 disposed on the first support post 303, and a second supporting insulator 306 disposed on the second support post 304. The cable terminal of the first cable 301 is fixedly installed on the first supporting insulator 305, and the cable terminal of the second cable 302 is fixedly installed on the second supporting insulator 306. One end of the first conductor 4 is connected to the cable terminal of the first cable 301, and one end of the second conductor 5 is connected to the cable terminal of the second cable 302. The other ends of the first conductor 4 and the second conductor 5 are respectively connected to the two ends of the segmenter 1. In a specific embodiment, the first cable 301 may be disposed within a first cable protection sleeve 310, and the second cable 302 may be disposed within a second cable protection sleeve 311. The connection method between the first cable 301 and the second cable 302 and the switchgear 2 can refer to conventional technologies in the field of cable connection.

[0056] As another specific implementation of cable equipment 3, such as Figure 3 As shown, the cable device 3 may include a third support post 307, a third support insulator 308 and a fourth support insulator 309 disposed on the third support post 307. The cable terminal of the first cable 301 is fixedly installed on the third support insulator 308, and the cable terminal of the second cable 302 is fixedly installed on the fourth support insulator 309. One end of the first conductor 4 is connected to the cable terminal of the first cable 301, and one end of the second conductor 5 is connected to the cable terminal of the second cable 302. The other ends of the first conductor 4 and the second conductor 5 are respectively connected to the two ends of the segmenter 1. In a specific embodiment, the first cable 301 may be disposed within a first cable protection sleeve 312, and the second cable 302 may be disposed within a second cable protection sleeve 313. The connection method between the first cable 301 and the second cable 302 and the switchgear 2 can refer to conventional technologies in the field of cable connection.

[0057] Preferably, the first cable 301 and the second cable 302 are arranged closely together. Here, the close arrangement of the first cable 301 and the second cable 302 can mean that they are arranged in parallel and in close contact, or it can mean that they are arranged in parallel and with a certain gap. The technician can set it according to the actual situation.

[0058] Preferably, the switching device 2 includes a current transformer 202 and a switch 201 connected in series with the primary winding of the current transformer 202. The current transformer 202 and the switch 201 connected in series are connected in parallel with the segmenter 1 through the cable device 3.

[0059] Preferably, this embodiment may also include a current process recorder 6 connected to the secondary winding of the current transformer 202. The current process recorder 6 can record the transient process of the locomotive passing through the section separator, which can be used to analyze and verify the design specifications of the arc suppression system.

[0060] Preferably, the switchgear 2 is normally closed, and open during maintenance and fault repair. It should be noted that a primary purpose of the sectionalizer 1 is to reduce the power outage area during maintenance or fault repair. Generally, when the sectionalizer 1 is located on the contact network outside the traction substation, the switchgear 2 connected in parallel with the sectionalizer 1 is normally closed, and only opens during maintenance or fault repair. Of course, if there is a power source on the contact networks on both sides of the sectionalizer 1 connected in parallel with the switchgear 2, the switchgear 2 is normally open, and closes only when needed. The selection of the switchgear 2's switching state can be determined by those skilled in the art based on the actual situation.

[0061] Example 2

[0062] like Figure 4 As shown, this embodiment provides a traction substation, which is applied to a traction power supply system in which an electric arc-suppression device is installed on the contact network at the traction substation. The traction substation supplies power to the contact networks on both sides of the electric arc-suppression device through cable equipment.

[0063] Here, under normal operating conditions, the traction substation connects to the traction bus S (e.g., ...) within the traction substation. Figure 5 As shown, the cable equipment 3 (which acts as a feeder for the traction substation) supplies power to the contact network on both sides of the electric contact network segment arc suppression device. This achieves the technical effect described in Example 1, where the voltage difference between the two ends of the electric contact network segment is less than the minimum insulation breakdown voltage of the electric contact network segment when the pantograph of the electric locomotive passes through the electric contact network segment. This avoids the occurrence of arcing that could cause contact network burnout, wire breakage, or other accidents. The realization of this technical effect is unrelated to whether the electric contact network segment arc suppression device itself adopts the railway contact network segment arc suppression device provided in Example 1. However, the realization of the technical effects of both Example 2 and Example 1 is based on the specific technical feature of the cable equipment 3.

[0064] Preferably, the electrical segmentation arc suppression device in this embodiment is the railway contact network electrical segmentation arc suppression device provided in Embodiment 1.

[0065] Here, under normal operating conditions, the switchgear 2 in the electric arc suppression device is normally open, and the traction substation supplies power to the contact networks on both sides of the electric arc suppression device through the traction busbar and cable equipment 3 within the traction substation. When the electric arc suppression device in this embodiment adopts the railway contact network electric arc suppression device provided in Embodiment 1, the traction substation in this embodiment can supply power to the contact networks on both sides of the electric arc suppression device through the cable equipment 3 in the railway contact network electric arc suppression device. Sharing the cable equipment 3 can save costs and reduce the space occupied by the equipment.

[0066] As a specific implementation method, if operating normally, the parallel switch at the electrical section can be opened. When the traction substation is powered by only one cable feeder, the parallel switch at the electrical section can be closed to supply power to both sides, thereby achieving maximum power supply range.

[0067] As a preferred option, such as Figure 6 As shown, when the traction substation malfunctions or needs maintenance, it is taken out of operation. At this time, the switch 2 in the electric segment arc suppression device can be closed, and the electric segment arc suppression device can be set to the railway contact network electric segment arc suppression device provided in Example 1. Even when the traction substation is out of operation, the voltage difference between the two ends of the electric segment is less than the minimum insulation breakdown voltage of the electric segment when the pantograph of the electric locomotive passes through the electric segment, thereby avoiding the technical effect of arcing that causes contact network burnout, wire breakage and other accidents.

[0068] Example 3

[0069] like Figure 7 As shown, this embodiment provides a traction power supply system, including the traction substation provided in embodiment 2. The contact network outside the traction substation in this embodiment can be equipped with the railway contact network electrical segmentation arc suppression device provided in embodiment 1.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0071] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A railway overhead contact line segmented arc suppression device, characterized in that, The device includes a sectionalizer, cable equipment, and switchgear. The sectionalizer is connected in series with the contact network, and the switchgear is connected in parallel with the sectionalizer through the cable equipment. The cable equipment includes a first cable and a second cable. The two ends of the sectionalizer are respectively connected to one end of the first cable and one end of the second cable, and the other end of the first cable is connected to the other end of the second cable through the switchgear.

2. The railway catenary electrical segmentation arc suppression device according to claim 1, characterized in that, The first cable is a single-core cable; the second cable is a single-core cable; the first cable and the second cable are arranged closely together.

3. The railway catenary electrical segmentation arc suppression device according to claim 1, characterized in that, The cable equipment further includes a first support post, a second support post, a first conductor, a second conductor, a first supporting insulator disposed on the first support post, and a second supporting insulator disposed on the second support post. The cable terminal of the first cable is fixedly installed on the first supporting insulator, and the cable terminal of the second cable is fixedly installed on the second supporting insulator. One end of the first conductor is connected to the cable terminal of the first cable, and one end of the second conductor is connected to the cable terminal of the second cable. The other ends of the first conductor and the other ends of the second conductor are respectively connected to the two ends of the segmenter.

4. The railway catenary electrical segmentation arc suppression device according to claim 1, characterized in that, The cable equipment further includes a third support post, a first conductor, a second conductor, a third support insulator and a fourth support insulator disposed on the third support post. The cable terminal of the first cable is fixedly installed on the third support insulator, and the cable terminal of the second cable is fixedly installed on the fourth support insulator. One end of the first conductor is connected to the cable terminal of the first cable, and one end of the second conductor is connected to the cable terminal of the second cable. The other ends of the first conductor and the other ends of the second conductor are respectively connected to the two ends of the segmenter.

5. The railway catenary electrical segmentation arc suppression device according to claim 1, characterized in that, The switching equipment includes a current transformer and a switch connected in series with the primary winding of the current transformer. The current transformer and the switch connected in series are connected in parallel with the sectionalizer through the cable equipment.

6. The railway catenary electrical segmentation arc suppression device according to claim 5, characterized in that, It also includes a current process recorder connected to the secondary winding of the current transformer.

7. The railway catenary electrical segmentation arc suppression device according to claim 1, characterized in that, The switchgear is normally closed, and is open during maintenance or in case of a fault.

8. A railway catenary electrical segmentation arc suppression device according to any one of claims 1-7, characterized in that, When the single-core cable length l of the first cable and the second cable are the same, the single-core cable length l and the center-axis distance d of the first cable and the second cable are... 12 The equivalent radius R of a single-core cable ε The following formula must be satisfied: In the formula, U T U is the voltage threshold. T The value is the minimum insulation breakdown voltage across the segmenter; L n R is the inductance per unit length of a single-core cable; μ0 is the dielectric constant; R ε d is the equivalent radius of a single-core cable; 12 The distance between the center axes of the first and second cables is [missing information]. for The natural logarithm of ; i1 and i2 are the currents in the first and second cables when the electric locomotive passes through the section separator, respectively; These are the rate of change of cable current when the locomotive passes through the section separator, which is related to the speed of the train.

9. A traction substation, characterized in that, The traction substation supplies power to the contact networks on both sides of the electrical contact network segmentation and arc suppression device through the cable equipment in the railway contact network segmentation and arc suppression device according to any one of claims 1-8, and the traction substation is a phase-independent traction substation.

10. A traction power supply system, characterized in that, Including the traction substation as described in claim 9.

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