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

Abstract

The invention 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] The present application relates to the technical field of railway traction power supply, and in particular to a railway overhead line electric segmented arc extinguishing device, a traction substation and a power supply system. Background Art

[0002] In the field of railway traction power supply technology, no matter it is industrial frequency AC out-of-phase power supply, same-phase power supply, bilateral power supply, or through-power supply based on same-phase power supply technology and bilateral power supply technology, in order to avoid power loss of the entire contact network due to faults, it is necessary to set up electrical segments on the contact network.

[0003] The existing power supply lines connecting the switches in the electrical segmentation all use bare wires in parallel with the segmenter. The longer the power supply line, the greater its inductance and reactance, and the bare wires need to be kept at a large distance to avoid short circuits and maintenance accidents. The mutual inductance is reduced, the residual equivalent inductance in the loop is large, and the impedance is large. Under steady-state conditions, the load of the running locomotive will cause a voltage difference at both ends of the segmenter, and when the locomotive passes through the segmenter, its load will switch between the two power supply lines, which will cause transient processes and transient overvoltages, causing arcing between the two sections of the segmenter. If this continues for a long time, it is easy to cause accidents such as contact network burning and line breaking, which seriously threatens railway equipment and operational safety. In order to solve the technical problem of arcing during the switching process of the locomotive through the segmenter, causing contact network burning, line breaking and other accidents, the present application proposes a new technical solution. Summary of the invention

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

[0005] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0006] The first aspect of the present application is to provide a railway overhead contact network electrical segmentation arc extinguishing device, including a segmenter, a cable device and a switch device, the segmenter is arranged in series on the overhead contact network, 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; and the first cable and the second cable are closely arranged.

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

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

[0010] Furthermore, the switch device includes a current transformer and a switch connected in series with the primary winding of the current transformer, and the series-connected current transformer and switch are connected in parallel with the sectioner through the cable device.

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

[0012] Furthermore, the switch state of the switch device is normally closed, and the switch state is open during maintenance or failure.

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

[0014]

[0015] Where U T is the voltage threshold, U T The value of is the minimum insulation breakdown voltage value at both ends of the segmenter; L n is the inductance per unit length of the single-core cable; μ0 is the dielectric constant; R ε is the equivalent radius of a single-core cable; d 12 is the distance between the center axes of the first cable and the second cable, for The natural logarithm of; i1 and i2 are the currents of the first cable and the second cable when the electric locomotive passes through the sectioner; They are the rates of change of cable current when the locomotive passes through the sectioner insulation, which are related to the speed at which the train passes.

[0016] The second aspect of the present application is to provide a traction substation, which supplies power to the contact networks on both sides of the electric segmentation arc extinguishing device through the cable equipment in the railway contact network electric segmentation arc extinguishing device as described in any one of claims 1 to 8, and the traction substation is a same-phase traction substation. The traction substation is a same-phase traction substation.

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

[0018] Compared with the prior art, this application mainly has the following beneficial effects:

[0019] (1) The sectionalizer is connected in parallel with the switchgear by using cable equipment, which eliminates the problem of short circuit of the cable equipment. This can enhance the reliability of railway power supply and improve the safety during inspection and troubleshooting.

[0020] (2) Cable equipment is used to connect the sectionalizer and the switch equipment in parallel. The core wires of the two cables can be kept closer together, so that the mutual inductance between the circuit formed by the two cables and the switch is larger and cancels out the inductance in the circuit. The residual 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 sectioning, 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 network burning and line breakage, which is beneficial to the safety of railway equipment and operations.

[0021] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, several embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a railway overhead line electric segmented arc extinguishing device provided for this application;

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

[0026] Figure 3 Another schematic diagram of a cable device provided for this application;

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

[0028] Figure 5 A schematic diagram of a specific traction substation provided for this application;

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

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

[0031] Figure numerals: 1—sectioner, 2—switch device, 201—switch, 202—current transformer, 3—cable equipment, 301—first cable, 302—second cable, 303—first pillar, 304—second pillar, 305—first supporting insulator, 306—second supporting insulator, 307—third pillar, 308—third supporting insulator, 309—fourth supporting insulator, 310—first cable protection sleeve, 311—second cable protection sleeve, 312—third cable protection sleeve, 313—fourth cable protection sleeve, 4—first conductor, 5—second conductor, 6—current process recorder, T—contact network, S—traction bus. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution, working principle and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and 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 cannot be understood as indicating or implying relative importance.

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

[0036] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] Example 1

[0039] like Figure 1As shown, this embodiment provides an arc extinguishing device for a railway overhead contact network section, comprising a section 1, a cable device 3 and a switch device 2. The section 1 is arranged in series on the overhead contact network T, and the switch device 2 is connected in parallel with the section 1 through the cable device 3. As described in the background technology, in the prior art, bare wires are used to connect the switch device 2 and the sectioner 1 in parallel. In order to avoid short circuit between the bare wires (for example, in non-fault conditions, the switch device 2 can be set to normally closed, so that the contact network on both sides of the sectioner 1 is energized. In the event of a fault or maintenance, the switch device 2 is disconnected to cut off the power to the contact network on one side of the sectioner 1, thereby ensuring the maximum power supply during maintenance or overhaul. At this time, it is absolutely necessary to avoid short circuit of the bare wires on both sides of the sectioner 1 to cause safety accidents), the spacing between the bare wires on both sides of the sectioner 1 must be set large enough. The large spacing of bare wires reduces the mutual inductance therebetween. The residual equivalent inductance (reactance) of the two bare wire 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 and cause accidents such as contact network burning and line breakage, seriously threatening railway equipment and operational safety. To this end, the present embodiment adopts cable equipment 3 to connect the switch equipment 2 and the sectionalizer 1 in parallel, and the core wires of the two cables can maintain a small distance to increase the mutual inductance therebetween. Since the mutual inductance and the self-inductance can weaken each other, the residual equivalent inductance of the loop is reduced, so that the voltage difference at both ends of the sectionalizer caused by the pantograph of the electric locomotive passing through the sectionalizer is greatly reduced, 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 and causing accidents such as contact network burning and line breakage.

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

[0041] The working principle of the present invention 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 first cable 301 and the second cable 302 have the same parameters such as length and wire diameter, and the first cable 301 and the second cable 302 are laid in parallel and closely, the loop parameters formed by the two cables and the switch are:

[0042]

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

[0044]

[0045] In formula (2), u 12 is the voltage difference between the two ends of the sectionalizer when the pantograph of the electric locomotive passes through the sectionalizer, i1 and i2 are the currents of the first cable 301 and the second cable 302 when the electric locomotive passes through the sectionalizer, respectively. are the current change rates of the first cable 301 and the second cable 302 when the current train passes through the segmenter, and the current change rates are related to the speed at which the train passes. In some embodiments, It is positively correlated with the speed of the train passing.

[0046] In order to prevent the voltage difference between the two ends of the sectionalizer from being too high and breaking down the sectionalizer when the electric locomotive passes through it, it is necessary to reduce the voltage difference between the two ends of the sectionalizer to 12 Controlled below the voltage threshold U T , that is u 12 <U T , from which we can get the following formula:

[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 value at both ends of the sectionalizer, which can be obtained through the performance parameters of the installed sectionalizer. The constants include the dielectric constant μ0. When the train speed is 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 of the first cable 301 and the second cable 302. 12 And the equivalent radius R of a single-core cable ε .

[0049] The voltage difference u across the segmenter12 It is proportional to L0-M0. If L0-M0 approaches 0, then u 12 tends to 0, and the transient process and overvoltage of the switching process are greatly reduced. 12 Less than the minimum insulation breakdown voltage U of the sectionalizer T , thereby avoiding arcing that may cause contact network burning, wire breakage and other accidents, which is beneficial to the safety of railway equipment and operations.

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

[0051]

[0052] In formula (4), for the center axis distance d between the first cable 301 and the second cable 302 12 And the equivalent radius R of a single-core cable ε For example, The smaller the value, the 12 The smaller it is, the less likely it is to reach the voltage threshold U T Therefore, during actual laying, the first cable 301 and the second cable 302 can be laid in parallel and closely, and the distance between the first cable 301 and the second cable 302 is zero, that is, the distance d between the center axes of the first cable 301 and the second cable 302 is 12 is the equivalent radius R of the single-core cable ε 2 times, so d 12 -R ε =R ε , In this case, the only variable left is the length of the single-core cable l, from which the control range of the single-core cable length l can be obtained, that is, 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 sectionalizer does not exceed the minimum insulation breakdown voltage when the train switches routes.

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

[0056] As another specific implementation of the cable device 3, 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 arranged on the third support post 307, the cable terminal of the first cable 301 is fixedly mounted on the third support insulator 308, the cable terminal of the second cable 302 is fixedly mounted on the fourth support insulator 309, one end of the first conductor 4 is connected to the cable terminal of the first cable 301, one end of the second conductor 5 is connected to the cable terminal of the second cable 302, and the other end of the first conductor 4 and the other end of the second conductor 5 are respectively connected to the two ends of the segmenter 1. In a specific embodiment, the first cable 301 can be arranged in a first cable protection sleeve 312, and the second cable 302 can be arranged in a second cable protection sleeve 313. The connection method of the first cable 301 and the second cable 302 with the switch device 2 can refer to conventional technologies in the technical field of cable connection, etc.

[0057] Preferably, the first cable 301 and the second cable 302 are closely arranged. Here, the first cable 301 and the second cable 302 are closely arranged, which can be arranged in parallel and in close contact, or in parallel and with a certain gap, and the technicians can arrange it according to the actual situation.

[0058] Preferably, the switch device 2 comprises a current transformer 202 and a switch 201 connected in series with the primary winding of the current transformer 202 , and the series-connected current transformer 202 and switch 201 are connected in parallel with the sectioner 1 via the cable device 3 .

[0059] Preferably, the present embodiment may further include a current process recorder 6 connected to the secondary winding of the current transformer 202. The current process recorder 6 can be used to record the transient process when the locomotive passes through the sectioner, so as to analyze and verify the design index of the arc extinguishing system.

[0060] Preferably, the switch state of the switch device 2 is normally closed, and the switch state is open during maintenance and faults. It should be noted here that one of the main purposes of setting up the sectioner 1 is to reduce the scope of power outages during maintenance or fault repair. Generally, when the sectioner 1 is set on the contact network outside the traction substation, the switch state of the switch device 2 connected in parallel with the sectioner 1 is normally closed, and the switch state of the switch device 2 is disconnected only during maintenance or fault repair; of course, if the contact networks on both sides of the sectioner 1 connected in parallel with the switch device 2 have power supply sources, the switch state of the switch device 2 is normally open and closed when needed; the switch state selection of the switch device 2 can be set by technical personnel in this field according to actual conditions.

[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 segmented arc extinguishing device is arranged on the contact network where the traction substation is located. The traction substation supplies power to the contact networks on both sides of the electric segmented arc extinguishing device through cable equipment.

[0063] Here, under normal operating conditions, the traction substation is connected to the traction bus S (such as Figure 5 As shown in the figure, the cable equipment 3 (which acts as the traction substation feeder at this time) supplies power to the contact networks on both sides of the electric segmentation arc extinguishing device, which can achieve the technical effect as described in Example 1 that when the pantograph of the electric locomotive passes through the electric segmentation, the voltage difference at both ends of the electric segmentation is less than the minimum insulation breakdown voltage of the electric segmentation, thereby avoiding arcing and causing accidents such as contact network burning and line breakage. The realization of this technical effect is irrelevant to whether the electric segmentation arc extinguishing device itself adopts the railway contact network electric segmentation arc extinguishing device provided in Example 1, but the realization of the technical effects of this Example 2 and Example 1 are both based on the specific technical feature of the cable equipment 3.

[0064] Preferably, the electric segmented arc extinguishing device in this embodiment is the railway contact network electric segmented arc extinguishing device provided in Example 1.

[0065] Here, under normal working conditions, the switch state of the switch device 2 in the electric segment arc extinguishing device is normally open, and the traction substation supplies power to the contact networks on both sides of the electric segment arc extinguishing device through the traction busbar and cable equipment 3 in the traction substation; when the electric segment arc extinguishing device in this embodiment adopts the railway contact network electric segment arc extinguishing device provided in Example 1, the traction substation in this embodiment can supply power to the contact networks on both sides of the electric segment arc extinguishing device through the cable equipment 3 in the railway contact network electric segment arc extinguishing device. Sharing the cable equipment 3 can save costs and reduce the space occupied by the equipment.

[0066] As a specific implementation method, if it operates normally, the parallel switches at the electrical section can be opened. When the traction substation has only one cable feeder supplying power, the parallel switches at the electrical section can be closed to supply power to both sides, thereby achieving maximum range power supply.

[0067] As a preference, Figure 6 As shown, when the traction substation fails or needs maintenance, the traction substation is shut down. At this time, the switch device 2 in the electric segmentation arc extinguishing device can be closed, and the electric segmentation arc extinguishing device can be set to the railway contact network electric segmentation arc extinguishing device provided in Example 1. When the traction substation is shut down, the voltage difference at both ends of the electric segment can be less than the minimum insulation breakdown voltage of the electric segment when the electric locomotive pantograph passes through the electric segment, thereby avoiding the technical effect of arcing causing accidents such as contact network burning and line breakage.

[0068] Example 3

[0069] like Figure 7 As shown, this embodiment provides a traction power supply system, including the traction substation provided in Example 2. The contact network outside the traction substation in this implementation can be provided with the railway contact network electric segmented arc extinguishing device provided in Example 1.

[0070] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0071] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A railway overhead line electric segmented arc extinguishing device, characterized in that: It includes a sectioner, a cable device and a switch device, wherein the sectioner is arranged in series on the contact network, and the switch device is connected in parallel with the sectioner through the cable device; the cable device includes a first cable and a second cable, and the two ends of the sectioner 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.

2. A railway overhead line electric segmented arc extinguishing 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 closely arranged.

3. The railway overhead line electric segmented arc extinguishing device according to claim 1, characterized in that: The cable equipment also includes a first pillar, a second pillar, a first conductor, a second conductor, a first supporting insulator arranged on the first pillar, and a second supporting insulator arranged on the second pillar. 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 end of the first conductor and the other end of the second conductor are respectively connected to the two ends of the segmenter.

4. The railway overhead line electric segmented arc extinguishing device according to claim 1, characterized in that: The cable equipment also includes a third pillar, a first conductor, a second conductor, a third supporting insulator and a fourth supporting insulator arranged on the third pillar, the cable terminal of the first cable is fixedly installed on the third supporting insulator, the cable terminal of the second cable is fixedly installed on the fourth supporting 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 end of the first conductor and the other end of the second conductor are respectively connected to the two ends of the segmenter.

5. The railway overhead line electric segmented arc extinguishing device according to claim 1, characterized in that: The switch device comprises a current transformer and a switch connected in series with the primary winding of the current transformer. The series-connected current transformer and the switch are connected in parallel with the sectioner through the cable device.

6. A railway overhead line electric segmented arc extinguishing 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 overhead line electric segmented arc extinguishing device according to claim 1, characterized in that: The switch state of the switch device is normally closed, and the switch state is open during maintenance or failure.

8. A railway overhead line electric segmented arc extinguishing device according to any one of claims 1 to 7, characterized in that: When the single-core cable lengths l of the first cable and the second cable are the same, the single-core cable length l, the center axis distance d of the first cable and the second cable 12 And the equivalent radius R of a single-core cable ε The following formula needs to be satisfied: Where U T is the voltage threshold, U T The value of is the minimum insulation breakdown voltage value at both ends of the segmenter; L n is the inductance per unit length of the single-core cable; μ0 is the dielectric constant; R ε is the equivalent radius of a single-core cable; d 12 is the distance between the center axes of the first cable and the second cable, for The natural logarithm of; i1 and i2 are the currents of the first cable and the second cable when the electric locomotive passes through the sectioner; They are the rates of change of cable current when the locomotive passes through the sectioner, which are related to the speed at which the train passes.

9. A traction substation, characterized in that: The traction substation supplies power to the contact networks on both sides of the electric segmented arc extinguishing device through the cable equipment in the railway contact network electric segmented arc extinguishing device as described in any one of claims 1 to 8, and the traction substation is a same-phase traction substation.

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

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