Fault location method and system for reclosing current of at traction network

Abstract

The present disclosure relates to the technical field of electrified railway traction power supply, and provides a fault location method and system using reclosing current of an AT traction network. The method comprises: when a reclosing operation is detected, obtaining circuit parameters of a target rail, a target contact line and a target negative feeder after reclosing, and determining whether a permanent short-circuit fault occurs in the target AT traction network; in the case where it is determined that a permanent short-circuit fault occurs, determining a fault type of the permanent short-circuit fault according to the circuit parameters; and calculating a short-circuit fault distance corresponding to the fault type according to a preset calculation strategy, the fault type and the target parameters. The present disclosure can greatly improve the accuracy and practicability of short-circuit fault location.

Description

Technical Field

[0001] This disclosure relates to the field of traction power supply technology for electrified railways, and in particular to a fault location method and system utilizing the reclosing current of the AT traction network. Background Technology

[0002] my country's railway construction has attracted worldwide attention and achieved remarkable results. The AT (Auto Transformer) power supply method has the advantages of longer power supply sections and greater power supply capacity, which can better meet the requirements of high-speed railways with high traffic density, high operating speed and large power supply capacity, and has become the mainstream power supply method for my country's high-speed railways at this stage.

[0003] Because the traction net is exposed to the elements, and the pantograph-net contacts at high speed, it is prone to malfunctions, causing power outages and affecting normal operations. Current technology lacks effective methods for fault location, making fault localization difficult and leading to prolonged power outages that disrupt normal transportation. Summary of the Invention

[0004] In view of this, the present disclosure provides a fault location method and system using the reclosing current of the AT traction network to solve the technical problem that the lack of a good fault location method in the prior art leads to difficulty in fault location, which in turn leads to prolonged power outage time and interference with normal transportation.

[0005] A first aspect of this disclosure provides a fault location method using the reclosing current of an AT traction network, comprising:

[0006] When a reclosing operation is detected, the circuit parameters of the target rail, target contact wire and target negative feeder after the reclosing are obtained to determine whether a permanent short circuit fault has occurred in the target AT traction network.

[0007] If a permanent short-circuit fault is determined, the fault type of the permanent short-circuit fault is determined based on the circuit parameters;

[0008] The short-circuit fault distance corresponding to the fault type is calculated based on the preset calculation strategy, the fault type, and the target parameters.

[0009] In some embodiments, the circuit parameters include the contact wire current at the first end of the target contact wire, the negative feeder current at the first end of the target negative feeder, a first voltage representing the potential difference between the first end of the target contact wire and the first end of the target rail, a second voltage representing the potential difference between the second end of the target contact wire and the second end of the target rail, a third voltage representing the potential difference between the first end of the target negative feeder and the first end of the target rail, a fourth voltage representing the potential difference between the second end of the target negative feeder and the second end of the target rail, the contact wire impedance representing the impedance per kilometer of the target contact wire, the rail impedance representing the impedance per kilometer of the target rail, the negative feeder impedance representing the impedance per kilometer of the target negative feeder, a first mutual impedance representing the mutual impedance per kilometer of the target contact wire and the target rail, a second mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target rail, and a third mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target contact wire.

[0010] The determination of whether a permanent short-circuit fault has occurred in the target AT traction network includes:

[0011] Obtain the first standard voltage and the third standard voltage corresponding to the first voltage and the third voltage respectively during normal operation;

[0012] If, within the first time period after the reclosing operation, the first voltage difference between the first voltage and the first standard voltage is not greater than a preset first threshold, and the second voltage difference between the third voltage and the third standard voltage is not greater than a preset second threshold, it indicates that no permanent fault has occurred.

[0013] Otherwise, it indicates a permanent failure.

[0014] In some embodiments, determining the fault type of the permanent short-circuit fault based on the circuit parameters when a permanent short-circuit fault is determined to have occurred includes:

[0015] If the first voltage difference is greater than or equal to a preset voltage threshold, and the second voltage difference is not greater than a preset second threshold, the fault type is the first fault type, which indicates that a short circuit fault has occurred between the target contact wire and the target rail.

[0016] If the first voltage difference is not greater than the first threshold, and the second voltage difference is greater than or equal to the second threshold, the fault type is the second fault type, which indicates that a short circuit fault has occurred between the target negative feeder and the target rail.

[0017] If the first voltage difference is not greater than the first threshold and the second voltage difference is not greater than the second threshold, the fault type is the third fault type, which indicates that a short circuit fault has occurred between the target contact line and the target negative feeder.

[0018] In some embodiments, the computation strategy includes:

[0019] If the fault type is the first fault type, the short-circuit fault distance between the contact wire and the target rail is calculated using the contact wire current, the first voltage, the second voltage, the contact wire impedance, the rail impedance, the first mutual impedance, and a preset first calculation formula, wherein the first calculation formula is:

[0020]

[0021] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the first voltage. This represents the second voltage, z T The contact wire impedance, z R The rail impedance, z TR This represents the first mutual impedance.

[0022] In some embodiments, the computation strategy further includes:

[0023] If the fault type is the second fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the negative feeder current, the third voltage, the fourth voltage, the negative feeder impedance, the rail impedance, the second mutual impedance, and a preset second calculation formula. The second calculation formula is:

[0024]

[0025] Where y represents the short-circuit fault distance, This represents the negative feeder current. This refers to the third voltage. Represents the fourth voltage, z F The negative feed line impedance, z R The rail impedance, z FR This represents the second mutual impedance.

[0026] In some embodiments, the computation strategy further includes:

[0027] If the fault type is the third fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the contact wire current, negative feeder current, first voltage, second voltage, third voltage, fourth voltage, contact wire impedance, negative feeder impedance, rail impedance, third mutual impedance, and a preset third calculation formula. The second calculation formula is:

[0028]

[0029] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the negative feeder current. This represents the first voltage. This indicates the second voltage. This refers to the third voltage. Represents the fourth voltage, z T The contact wire impedance, z F The negative feed line impedance, z TF This represents the third mutual impedance.

[0030] A second aspect of this disclosure provides a fault location system utilizing the reclosing current of an AT traction network, comprising:

[0031] The first judgment module is used to obtain the circuit parameters of the target rail, target contact wire and target negative feeder after the reclosing operation when the reclosing operation is detected, and to determine whether the target AT traction network has a permanent short circuit fault.

[0032] The second judgment module is used to determine the fault type of the permanent short circuit fault based on the circuit parameters when it is determined that a permanent short circuit fault has occurred.

[0033] The calculation module is used to calculate the short-circuit fault distance corresponding to the fault type according to the preset calculation strategy, the fault type and the target parameters.

[0034] In some embodiments, the circuit parameters include the contact wire current at the first end of the target contact wire, the negative feeder current at the first end of the target negative feeder, a first voltage representing the potential difference between the first end of the target contact wire and the first end of the target rail, a second voltage representing the potential difference between the second end of the target contact wire and the second end of the target rail, a third voltage representing the potential difference between the first end of the target negative feeder and the first end of the target rail, a fourth voltage representing the potential difference between the second end of the target negative feeder and the second end of the target rail, the contact wire impedance representing the impedance per kilometer of the target contact wire, the rail impedance representing the impedance per kilometer of the target rail, the negative feeder impedance representing the impedance per kilometer of the target negative feeder, a first mutual impedance representing the mutual impedance per kilometer of the target contact wire and the target rail, a second mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target rail, and a third mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target contact wire.

[0035] The determination of whether a permanent short-circuit fault has occurred in the target AT traction network includes:

[0036] Obtain the first standard voltage and the third standard voltage corresponding to the first voltage and the third voltage respectively during normal operation;

[0037] If, within the first time period after the reclosing operation, the first voltage difference between the first voltage and the first standard voltage is not greater than a preset first threshold, and the second voltage difference between the third voltage and the third standard voltage is not greater than a preset second threshold, it indicates that no permanent fault has occurred.

[0038] Otherwise, it indicates a permanent failure.

[0039] In some embodiments, the second determining module is further configured to:

[0040] If the first voltage difference is greater than or equal to a preset voltage threshold, and the second voltage difference is not greater than a preset second threshold, the fault type is the first fault type, which indicates that a short circuit fault has occurred between the target contact wire and the target rail.

[0041] If the first voltage difference is not greater than the first threshold, and the second voltage difference is greater than or equal to the second threshold, the fault type is the second fault type, which indicates that a short circuit fault has occurred between the target negative feeder and the target rail.

[0042] If the first voltage difference is not greater than the first threshold and the second voltage difference is not greater than the second threshold, the fault type is the third fault type, which indicates that a short circuit fault has occurred between the target contact line and the target negative feeder.

[0043] In some embodiments, the computation strategy includes:

[0044] If the fault type is the first fault type, the short-circuit fault distance between the contact wire and the target rail is calculated using the contact wire current, the first voltage, the second voltage, the contact wire impedance, the rail impedance, the first mutual impedance, and a preset first calculation formula, wherein the first calculation formula is:

[0045]

[0046] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the first voltage. This represents the second voltage, z T The contact wire impedance, z R The rail impedance, z TR This represents the first mutual impedance.

[0047] In some embodiments, the computation strategy further includes:

[0048] If the fault type is the second fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the negative feeder current, the third voltage, the fourth voltage, the negative feeder impedance, the rail impedance, the second mutual impedance, and a preset second calculation formula. The second calculation formula is:

[0049]

[0050] Where y represents the short-circuit fault distance, This represents the negative feeder current. This refers to the third voltage. Represents the fourth voltage, z F The negative feed line impedance, z R The rail impedance, z FR This represents the second mutual impedance.

[0051] In some embodiments, the computation strategy further includes:

[0052] If the fault type is the third fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the contact wire current, negative feeder current, first voltage, second voltage, third voltage, fourth voltage, contact wire impedance, negative feeder impedance, rail impedance, third mutual impedance, and a preset third calculation formula. The second calculation formula is:

[0053]

[0054] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the negative feeder current. This represents the first voltage. This indicates the second voltage. This refers to the third voltage. Represents the fourth voltage, z T The contact wire impedance, z F The negative feed line impedance, z TF This represents the third mutual impedance.

[0055] A third aspect of this disclosure provides a fault location system utilizing the reclosing current of an AT traction network, comprising a contact line current transformer, a negative feeder current transformer, a first voltage transformer, a second voltage transformer, a third voltage transformer, a fourth voltage transformer, a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker, a sixth circuit breaker, a first autotransformer, a second autotransformer, a data acquisition device, a fault location device, and a data transmission path, wherein...

[0056] The first end of the contact wire current transformer is connected to the first end of the target contact wire, and is used to measure the contact wire current at the first end of the target contact wire and transmit the contact wire current to the ranging device.

[0057] The first end of the negative feeder current transformer is connected to the first end of the target negative feeder, and is used to measure the negative feeder current at the first end of the target negative feeder and transmit the negative feeder current to the ranging device.

[0058] The first end of the first voltage transformer is connected to the first end of the target contact wire, and is used to measure the first voltage between the first end of the target contact wire and the first end of the target rail, and transmit the first voltage to the ranging device.

[0059] The first end of the second voltage transformer is connected to the second end of the target contact wire, and is used to measure the second voltage between the second end of the target contact wire and the second end of the target rail, and transmit the second voltage to the acquisition device.

[0060] The first end of the third voltage transformer is connected to the first end of the target negative feeder, and is used to measure the third voltage between the first end of the target negative feeder and the first end of the target rail, and transmit the third voltage to the ranging device.

[0061] The first end of the fourth voltage transformer is connected to the second end of the target negative feeder, and is used to measure the fourth voltage between the second end of the target negative feeder and the second end of the target rail, and transmit the fourth voltage to the acquisition device.

[0062] The first circuit breaker is located at the first end of the target contact wire and is used to control the opening / closing state of the target contact wire.

[0063] The second circuit breaker is located at the first end of the target negative feeder and is used to control the open / closed state of the target negative feeder;

[0064] The first end of the first autotransformer is connected to the target contact line through the third circuit breaker, its second end is connected to the target rail, and its third end is connected to the target negative feeder through the fourth circuit breaker to increase the voltage. The first end of the first autotransformer is close to the rail.

[0065] The first end of the second autotransformer is connected to the target contact line through the fifth circuit breaker, the second end is connected to the target rail, and the third end is connected to the target negative feeder through the sixth circuit breaker to increase the voltage. The first autotransformer is located near the second end of the rail.

[0066] The first end of the acquisition device is connected to the second section of the second voltage transformer, the second end is connected to the second end of the fourth voltage transformer, and the third end is connected to the second end of the data transmission path, for receiving the second voltage and the fourth voltage and transmitting the second voltage and the fourth voltage to the ranging device.

[0067] The first end of the ranging device is connected to the second end of the contact wire current transformer, the second end is connected to the second end of the negative feeder current transformer, the third end is connected to the second end of the first voltage transformer, the fourth end is connected to the second end of the third voltage transformer, and the fifth end is connected to the first end of the data transmission path. The ranging device implements the steps of the above method when it is running.

[0068] In some embodiments, the data transmission path is an optical fiber channel.

[0069] In some embodiments, the system further includes a central computing device, which is connected to the second end of the acquisition device and the fourth end of the ranging device, respectively.

[0070] The ranging device is also used to transmit the contact wire current and the first voltage to the acquisition device, and the acquisition device is also used to implement the steps of the above method during operation;

[0071] The central computing device is used to simultaneously receive the first short-circuit fault distance calculated by the ranging device and the second short-circuit fault distance calculated by the acquisition device, and to issue an alarm when the difference between the first short-circuit fault distance and the second short-circuit fault distance is greater than a preset first threshold.

[0072] A fourth aspect of this disclosure provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described method.

[0073] A fifth aspect of this disclosure provides a computer program product comprising a computer program or instructions that, when executed by a processor, implement the steps of the method described above.

[0074] Beneficial effects

[0075] The beneficial effects of this disclosure compared to the prior art include at least the following: when a reclosing operation is detected, the circuit parameters of the target rail, target contact wire, and target negative feeder after the reclosing operation are obtained to determine whether a permanent short-circuit fault has occurred in the target AT traction network; if a permanent short-circuit fault is determined, the fault type of the permanent short-circuit fault is determined based on the circuit parameters; and the short-circuit fault distance corresponding to the fault type is calculated based on a preset calculation strategy, the fault type, and the target parameters, which can greatly improve the accuracy of short-circuit fault distance measurement. In addition, the practicality of this disclosure is increased because it reduces the need for manual on-site location searches for short-circuit faults. Attached Figure Description

[0076] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0077] Figure 1 This is a schematic diagram of an application scenario of the fault location method using the reclosing current of the AT traction network provided in the embodiments of this disclosure;

[0078] Figure 2 This is a flowchart of some embodiments of a fault location method using AT traction network reclosing current provided according to the embodiments of this disclosure;

[0079] Figure 3a This is a simplified structural diagram of the contact wire, rail, and negative feeder of some embodiments of a fault location system utilizing the reclosing current of an AT traction network, provided according to embodiments of this disclosure.

[0080] Figure 3b This is a simplified structural diagram of the contact wire, rail, and negative feeder of some embodiments of a fault location system utilizing the reclosing current of the AT traction network provided according to the embodiments of this disclosure.

[0081] Figure 3c This is a simplified structural diagram of the acquisition device and the ranging device of some embodiments of a fault location system utilizing the reclosing current of the AT traction network provided in this disclosure.

[0082] Figure 4 This is a simplified structural diagram of a fault location system utilizing the reclosing current of the AT traction network, provided according to an embodiment of this disclosure.

[0083] Figure 5 This is a schematic diagram of an electronic device provided according to an embodiment of the present disclosure.

[0084] The labels for the various figures in the diagram are shown below:

[0085] LHT1: Contact line current transformer;

[0086] LHF1: Negative feeder current transformer;

[0087] YHT1: First voltage transformer;

[0088] YHT2: Second voltage transformer;

[0089] YHF1: Third voltage transformer;

[0090] YHF2: Fourth voltage transformer;

[0091] QF01: First circuit breaker;

[0092] QF02: Second circuit breaker;

[0093] QF11: Third circuit breaker;

[0094] QF21: Fourth circuit breaker;

[0095] QF12: Fifth circuit breaker;

[0096] QF22: Sixth circuit breaker;

[0097] QF13: Sixth circuit breaker;

[0098] QF14: Sixth circuit breaker;

[0099] AT1: First autotransformer;

[0100] AT2: Second autotransformer;

[0101] AT3: Third autotransformer. Detailed Implementation

[0102] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0103] It should also be noted that, for ease of description, only the parts relevant to this disclosure are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0104] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different systems, devices, modules or units, and are not used to limit the order of functions performed by these systems, devices, modules or units or their interdependencies.

[0105] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0106] The names of messages or information exchanged between multiple systems in this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0107] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0108] Figure 1 This is a schematic diagram of an application scenario of a fault location method using AT traction network reclosing current according to some embodiments of this disclosure.

[0109] exist Figure 1 In the application scenario, firstly, when the reclosing operation 102 is detected, the computing device 101 can obtain the circuit parameters 103 of the target rail, target contact wire and target negative feeder after the composite gate, and determine whether the target AT traction network has a permanent short circuit fault 104.

[0110] Secondly, the computing device 101 can determine the fault type 105 of the permanent short circuit fault based on the circuit parameters 103 if a permanent short circuit fault is determined to have occurred.

[0111] Finally, the computing device 101 can calculate the short-circuit fault distance 107 corresponding to the fault type according to the preset calculation strategy 106, the fault type 105 and the target parameter 103.

[0112] It should be noted that the aforementioned computing device 101 can be either hardware or software. When the computing device is hardware, it can be implemented as a distributed cluster consisting of multiple servers or terminal devices, or as a single server or a single terminal device. When the computing device is software, it can be installed within the hardware devices listed above. It can be implemented as, for example, multiple software programs or software modules used to provide distributed services, or as a single software program or software module. No specific limitations are made here.

[0113] It should be understood that Figure 1 The number of computing devices shown is merely illustrative. Any number of computing devices can be used depending on implementation needs.

[0114] Continue to refer to Figure 2 The flowchart 200 illustrates some embodiments of a fault location method utilizing AT traction network reclosing current according to this disclosure. The method can be... Figure 1 The method for fault location using the reclosing current of the AT traction network is executed by the computing device 101. The method includes the following steps:

[0115] Step 201: When a reclosing operation is detected, obtain the circuit parameters of the target rail, target contact wire and target negative feeder after the composite gate, and determine whether a permanent short circuit fault has occurred in the target AT traction network.

[0116] In some embodiments, the execution subject of the fault location method utilizing the AT traction network reclosing current (e.g., Figure 1 The computing device 101 shown can be connected to the target device via a wired or wireless connection. Then, when a reclosing operation is detected, it acquires the circuit parameters of the target rail, target contact wire, and target negative feeder after the reclosing gate to determine whether a permanent short circuit fault has occurred in the target AT traction network.

[0117] Please refer to Figure 3a Reclosing operation can refer to the process where, when a fault is detected by a relay protection device or other detection device in the command center or processing center, all circuit breakers are first closed, followed by the closure of the first and second circuit breakers. During the closure, a short-time current is generated in the target contact line and the target negative feeder. The relevant parameters of this short-time current are obtained, which are the circuit parameters.

[0118] The target rail can refer to a section of rail used for testing. The target contact wire can refer to a section of contact wire corresponding to the target rail. The target negative feeder can refer to a section of negative feeder corresponding to the aforementioned rail / contact wire. The AT traction network can refer to the AT traction network of the target network segment under testing. It should be noted that the first end of the target rail can be the rail between two stations, the rail between two measuring points, or the rail between a certain station and a certain measuring point. The contact wire and negative feeder are similar and will not be described in detail here. Please refer to... Figure 3a The target contact line, target rail, and target negative feeder are parallel and correspond to each other. That is, the first end of the target rail corresponds to the first end of the target contact line and the first end of the target negative feeder, the second end of the target rail corresponds to the second end of the target contact line and the target negative feeder, and the middle part of the target rail also corresponds to the middle part of the target contact line and the target negative feeder.

[0119] Therefore, in some optional implementations, the first end and the second end of the target rail refer to the beginning and end of the target rail, respectively, and the first end and the second end of the target contact line refer to the beginning and end of the target contact line, respectively. The beginning end can refer to the starting point of the rail / contact line located at a certain station, and the end end can refer to the ending point of the rail / contact line located at another station, that is, the target rail / contact line is located between two stations.

[0120] When a fault occurs in the AT traction network and a reclosing operation is performed, the cause of the fault can be either a permanent fault (or transient fault) or a non-permanent fault. Non-permanent faults usually restore normal power supply and return to normal operation after the reclosing operation. Permanent faults require manual intervention. Since non-permanent faults typically account for a large proportion (e.g., over 70%, depending on the specific area), they do not require manual maintenance. Therefore, determining whether a fault is permanent greatly increases the practicality of this disclosure.

[0121] In some optional implementations, the circuit parameters include the contact wire current at the first end of the target contact wire, the negative feeder current at the first end of the target negative feeder, a first voltage representing the potential difference between the first end of the target contact wire and the first end of the target rail, a second voltage representing the potential difference between the second end of the target contact wire and the second end of the target rail, a third voltage representing the potential difference between the first end of the target negative feeder and the first end of the target rail, a fourth voltage representing the potential difference between the second end of the target negative feeder and the second end of the target rail, the contact wire impedance representing the impedance per kilometer of the target contact wire, the rail impedance representing the impedance per kilometer of the target rail, the negative feeder impedance representing the impedance per kilometer of the target negative feeder, a first mutual impedance representing the mutual impedance per kilometer of the target contact wire and the target rail, a second mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target rail, and a third mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target contact wire.

[0122] The aforementioned executing entity can determine whether a permanent short-circuit fault has occurred in the target AT traction network through the following steps: First, obtain the first standard voltage and the third standard voltage corresponding to the first voltage and the third voltage respectively during normal operation; Second, within a first time period after the reclosing operation, if the first voltage difference between the first voltage and the first standard voltage is not greater than a preset first threshold, and the second voltage difference between the third voltage and the third standard voltage is not greater than a preset second threshold, it indicates that no permanent fault has occurred; otherwise, it indicates that a permanent fault has occurred.

[0123] The first duration can refer to the time it takes to acquire current parameters after the composite circuit breaker operation is executed. This duration is generally short, such as 1000 milliseconds, and the specific value is set according to the actual situation; this is just an example. The first threshold can refer to the limit value of the difference between the floating value and the average value of the first voltage during normal operation. When the difference of the first voltage is greater than the first threshold, it indicates that the line has a fault. Similarly, the second threshold can refer to the limit value of the difference between the floating value and the average value of the second voltage during normal operation. It should be noted that the first threshold and the second threshold can be fixed values ​​or percentage values. For example, as an example, if the average voltage of the first voltage during normal operation is 1000V and the allowable fluctuation range is ±50V, then the first threshold is 50V; or, the first threshold can be 110% of the average voltage value during normal operation, that is, when it exceeds 110% of the current, a short circuit fault is judged to have occurred. The above 50V or 110% are just examples; the specific values ​​need to be calculated or confirmed according to the actual situation, and no specific restrictions are imposed. In addition, the short circuit fault can refer to common short circuit faults such as metallic short circuits or high-resistance short circuits (non-metallic short circuits).

[0124] It should be noted that the aforementioned wireless connection methods may include, but are not limited to, 3G / 4G / 5G connections, WiFi connections, Bluetooth connections, WiMAX connections, Zigbee connections, UWB (ultra wideband) connections, and other currently known or future wireless connection methods.

[0125] Step 202: If a permanent short circuit fault is determined to have occurred, the fault type of the permanent short circuit fault is determined based on the circuit parameters.

[0126] In some embodiments, the aforementioned execution entity may determine the fault type of the permanent short-circuit fault based on the circuit parameters if a permanent short-circuit fault is determined to have occurred.

[0127] The fault types of permanent short circuit faults can refer to different types of short circuits occurring in the target contact wire or the target negative feeder.

[0128] In some optional implementations of certain embodiments, the aforementioned execution entity may determine the fault type of the permanent short-circuit fault based on the circuit parameters when a permanent short-circuit fault is determined to have occurred, based on the following steps:

[0129] First, if the first voltage difference is greater than or equal to a preset voltage threshold, and the second voltage difference is not greater than a preset second threshold, the fault type is the first fault type, which indicates that a short circuit fault has occurred between the target contact wire and the target rail.

[0130] The second step is that if the first voltage difference is not greater than the first threshold and the second voltage difference is greater than or equal to the second threshold, the fault type is the second fault type, which indicates that a short circuit fault has occurred between the target negative feeder and the target rail.

[0131] Third step: If the first voltage difference is not greater than the first threshold and the second voltage difference is not greater than the second threshold, the fault type is the third fault type, which indicates that a short circuit fault has occurred between the target contact line and the target negative feeder.

[0132] Step 203: Calculate the short-circuit fault distance corresponding to the fault type according to the preset calculation strategy, the fault type, and the target parameters.

[0133] In some embodiments, the aforementioned executing entity can calculate the short-circuit fault distance corresponding to the fault type based on a preset calculation strategy, the fault type, and the target parameter. The calculation strategy can refer to a strategy that uses different calculation methods to calculate based on different fault types.

[0134] In some optional implementations of certain embodiments, the computation strategy includes:

[0135] If the fault type is the first fault type, the short-circuit fault distance between the contact wire and the target rail is calculated using the contact wire current, the first voltage, the second voltage, the contact wire impedance, the rail impedance, the first mutual impedance, and a preset first calculation formula, wherein the first calculation formula is:

[0136]

[0137] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the first voltage. This represents the second voltage, z T The contact wire impedance, z R The rail impedance, z TR This represents the first mutual impedance.

[0138] In some alternative implementations of certain embodiments, the computation strategy further includes:

[0139] If the fault type is the second fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the negative feeder current, the third voltage, the fourth voltage, the negative feeder impedance, the rail impedance, the second mutual impedance, and a preset second calculation formula. The second calculation formula is:

[0140]

[0141] Where y represents the short-circuit fault distance, This represents the negative feeder current. This refers to the third voltage. Represents the fourth voltage, z F The negative feed line impedance, z R The rail impedance, z FR This represents the second mutual impedance.

[0142] In some alternative implementations of some embodiments, the computation strategy further includes:

[0143] If the fault type is the third fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the contact wire current, negative feeder current, first voltage, second voltage, third voltage, fourth voltage, contact wire impedance, negative feeder impedance, rail impedance, third mutual impedance, and a preset third calculation formula. The second calculation formula is:

[0144]

[0145] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the negative feeder current. This represents the first voltage. This indicates the second voltage. This refers to the third voltage. Represents the fourth voltage, z T The contact wire impedance, z F The negative feed line impedance, z TF This represents the third mutual impedance.

[0146] The beneficial effects of one of the above embodiments of this disclosure include at least the following: when a reclosing operation is detected, the circuit parameters of the target rail, target contact wire, and target negative feeder after the reclosing operation are obtained to determine whether a permanent short-circuit fault has occurred in the target AT traction network; if a permanent short-circuit fault is determined, the fault type of the permanent short-circuit fault is determined according to the circuit parameters; and the short-circuit fault distance corresponding to the fault type is calculated according to a preset calculation strategy, the fault type, and the target parameters, which can greatly improve the accuracy of short-circuit fault distance measurement. In addition, the practicality of this disclosure is increased because it reduces the need for manual on-site search for short-circuit locations.

[0147] The following are embodiments of the apparatus disclosed herein, which can be used to execute embodiments of the method disclosed herein. For details not disclosed in the apparatus embodiments of this disclosure, please refer to the embodiments of the method disclosed herein.

[0148] Further reference Figure 4 As an implementation of the methods described in the above figures, this disclosure provides some embodiments of a fault location device utilizing the reclosing current of the AT traction network. These system embodiments are similar to... Figure 2 The above-described method embodiments correspond to these.

[0149] like Figure 4 As shown, a fault location device 400 utilizing the reclosing current of the AT traction network in some embodiments includes:

[0150] The first judgment module is used to obtain the circuit parameters of the target rail, target contact wire and target negative feeder after the reclosing operation when the reclosing operation is detected, and to determine whether the target AT traction network has a permanent short circuit fault.

[0151] The second judgment module is used to determine the fault type of the permanent short circuit fault based on the circuit parameters when it is determined that a permanent short circuit fault has occurred.

[0152] The calculation module is used to calculate the short-circuit fault distance corresponding to the fault type according to the preset calculation strategy, the fault type and the target parameters.

[0153] In some optional implementations of some embodiments, the circuit parameters include the contact wire current at the first end of the target contact wire, the negative feeder current at the first end of the target negative feeder, a first voltage representing the potential difference between the first end of the target contact wire and the first end of the target rail, a second voltage representing the potential difference between the second end of the target contact wire and the second end of the target rail, a third voltage representing the potential difference between the first end of the target negative feeder and the first end of the target rail, a fourth voltage representing the potential difference between the second end of the target negative feeder and the second end of the target rail, the contact wire impedance representing the impedance per kilometer of the target contact wire, the rail impedance representing the impedance per kilometer of the target rail, the negative feeder impedance representing the impedance per kilometer of the target negative feeder, a first mutual impedance representing the mutual impedance per kilometer of the target contact wire and the target rail, a second mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target rail, and a third mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target contact wire.

[0154] The determination of whether a permanent short-circuit fault has occurred in the target AT traction network includes:

[0155] Obtain the first standard voltage and the third standard voltage corresponding to the first voltage and the third voltage respectively during normal operation;

[0156] If, within the first time period after the reclosing operation, the first voltage difference between the first voltage and the first standard voltage is not greater than a preset first threshold, and the second voltage difference between the third voltage and the third standard voltage is not greater than a preset second threshold, it indicates that no permanent fault has occurred.

[0157] Otherwise, it indicates a permanent failure.

[0158] In some optional implementations of certain embodiments, the second determining module is further configured as follows:

[0159] If the first voltage difference is greater than or equal to a preset voltage threshold, and the second voltage difference is not greater than a preset second threshold, the fault type is the first fault type, which indicates that a short circuit fault has occurred between the target contact wire and the target rail.

[0160] If the first voltage difference is not greater than the first threshold, and the second voltage difference is greater than or equal to the second threshold, the fault type is the second fault type, which indicates that a short circuit fault has occurred between the target negative feeder and the target rail.

[0161] If the first voltage difference is not greater than the first threshold and the second voltage difference is not greater than the second threshold, the fault type is the third fault type, which indicates that a short circuit fault has occurred between the target contact line and the target negative feeder.

[0162] In some optional implementations of certain embodiments, the computation strategy includes:

[0163] If the fault type is the first fault type, the short-circuit fault distance between the contact wire and the target rail is calculated using the contact wire current, the first voltage, the second voltage, the contact wire impedance, the rail impedance, the first mutual impedance, and a preset first calculation formula, wherein the first calculation formula is:

[0164]

[0165] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the first voltage. This represents the second voltage, z T The contact wire impedance, z R The rail impedance, z TR This represents the first mutual impedance.

[0166] In some optional implementations of certain embodiments, the computation strategy further includes:

[0167] If the fault type is the second fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the negative feeder current, the third voltage, the fourth voltage, the negative feeder impedance, the rail impedance, the second mutual impedance, and a preset second calculation formula. The second calculation formula is:

[0168]

[0169] Where y represents the short-circuit fault distance, This represents the negative feeder current. This refers to the third voltage. Represents the fourth voltage, z F The negative feed line impedance, z R The rail impedance, z FR This represents the second mutual impedance.

[0170] In some optional implementations of certain embodiments, the computation strategy further includes:

[0171] If the fault type is the third fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the contact wire current, negative feeder current, first voltage, second voltage, third voltage, fourth voltage, contact wire impedance, negative feeder impedance, rail impedance, third mutual impedance, and a preset third calculation formula. The second calculation formula is:

[0172]

[0173] Where y represents the short-circuit fault distance, This indicates the contact wire current. This represents the negative feeder current. This represents the first voltage. This indicates the second voltage. This refers to the third voltage. Represents the fourth voltage, z T The contact wire impedance, z F The negative feed line impedance, z TF This represents the third mutual impedance.

[0174] It is understandable that the modules described in the device 400 are similar to those in the reference. Figure 2 The steps in the described method correspond accordingly. Therefore, the operations, features, and beneficial effects described above for the method also apply to device 400 and the modules contained therein, and will not be repeated here.

[0175] like Figure 5As shown, the electronic device 500 may include a processing unit (e.g., a central processing unit, a graphics processor, etc.) 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage device 508 into a random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of the electronic device 500. The processing unit 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0176] Typically, the following devices can be connected to I / O interface 505: input devices 506 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 507 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 508 including, for example, magnetic tapes, hard disks, etc.; and communication devices 509. Communication device 509 allows electronic device 500 to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 5 An electronic device 500 with various devices is shown; however, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively. Figure 5 Each box shown can represent a device or multiple devices as needed.

[0177] In particular, according to some embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, some embodiments of this disclosure include a computer program product comprising a computer program or instructions carried on a computer-readable medium, the computer program or instructions containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 509, or installed from a storage device 508, or installed from a ROM 502. When the computer program is executed by the processing device 501, it performs the functions defined in the methods of some embodiments of this disclosure.

[0178] It should be noted that, in some embodiments of this disclosure, the computer-readable medium described above may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium may be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In some embodiments of this disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In some embodiments of this disclosure, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0179] In some implementations, clients and servers can communicate using any currently known or future-developed network protocol such as HTTP (Hypertext Transfer Protocol) and can interconnect with digital data communication (e.g., communication networks) of any form or medium. Examples of communication networks include local area networks (“LANs”), wide area networks (“WANs”), the Internet (e.g., the Internet of Things), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future-developed networks.

[0180] The aforementioned computer-readable medium may be included in the aforementioned device; or it may exist independently and not assembled into the electronic device. The aforementioned computer-readable medium carries one or more programs that, when executed by the electronic device, cause the electronic device to:

[0181] When the current detected at the first end of the target rail is greater than the preset current threshold, the contact wire current at the first end of the target contact wire corresponding to the target rail is obtained. The rail current at the first end of the rail represents the first voltage of the potential difference between the first end of the target contact wire and the first end of the target rail, the second voltage of the potential difference between the second end of the target contact wire and the second end of the target rail, the contact wire impedance per kilometer of the target contact wire, the rail impedance per kilometer of the target rail, and the first mutual impedance per kilometer of the mutual impedance between the target contact wire and the target rail.

[0182] The short-circuit fault distance between the contact wire and the target rail is calculated based on the contact wire current, rail current, first voltage, second voltage, contact wire impedance, rail impedance, first mutual impedance, and a preset first calculation formula.

[0183] Computer program code for performing operations of some embodiments of this disclosure can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0184] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0185] The modules described in some embodiments of this disclosure can be implemented in software or hardware. The described modules can also be located in a processor, for example, and can be described as:

[0186] The module includes an acquisition module and a calculation module. For example, the acquisition module can also be described as "when the current detected at the first end of the target rail is greater than a preset current threshold, acquiring the contact wire current at the first end of the target contact wire corresponding to the target rail, wherein the rail current at the first end of the rail represents a first voltage representing the potential difference between the first end of the target contact wire and the first end of the target rail, a second voltage representing the potential difference between the second end of the target contact wire and the second end of the target rail, a contact wire impedance representing the impedance per kilometer of the target contact wire, a rail impedance representing the impedance per kilometer of the target rail, and a first mutual impedance representing the mutual impedance per kilometer of the target contact wire and the target rail."

[0187] Please continue to refer to Figure 3a and Figure 3c In some embodiments, this disclosure also provides a fault location system utilizing the reclosing current of the AT traction network, including a contact line current transformer, a negative feeder current transformer, a first voltage transformer, a second voltage transformer, a third voltage transformer, a fourth voltage transformer, a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker, a sixth circuit breaker, a first autotransformer, a second autotransformer, a data acquisition device, a distance measurement device, and a data transmission path, wherein...

[0188] The first end of the contact wire current transformer is connected to the first end of the target contact wire, and is used to measure the contact wire current at the first end of the target contact wire and transmit the contact wire current to the ranging device.

[0189] The first end of the negative feeder current transformer is connected to the first end of the target negative feeder, and is used to measure the negative feeder current at the first end of the target negative feeder and transmit the negative feeder current to the ranging device.

[0190] The first end of the first voltage transformer is connected to the first end of the target contact wire, and is used to measure the first voltage between the first end of the target contact wire and the first end of the target rail, and transmit the first voltage to the ranging device.

[0191] The first end of the second voltage transformer is connected to the second end of the target contact wire, and is used to measure the second voltage between the second end of the target contact wire and the second end of the target rail, and transmit the second voltage to the acquisition device.

[0192] The first end of the third voltage transformer is connected to the first end of the target negative feeder, and is used to measure the third voltage between the first end of the target negative feeder and the first end of the target rail, and transmit the third voltage to the ranging device.

[0193] The first end of the fourth voltage transformer is connected to the second end of the target negative feeder, and is used to measure the fourth voltage between the second end of the target negative feeder and the second end of the target rail, and transmit the fourth voltage to the acquisition device.

[0194] The first circuit breaker is located at the first end of the target contact wire and is used to control the opening / closing state of the target contact wire.

[0195] The second circuit breaker is located at the first end of the target negative feeder and is used to control the open / closed state of the target negative feeder;

[0196] The first end of the first autotransformer is connected to the target contact line through the third circuit breaker, its second end is connected to the target rail, and its third end is connected to the target negative feeder through the fourth circuit breaker to increase the voltage. The first end of the first autotransformer is close to the rail.

[0197] The first end of the second autotransformer is connected to the target contact line through the fifth circuit breaker, the second end is connected to the target rail, and the third end is connected to the target negative feeder through the sixth circuit breaker to increase the voltage. The first autotransformer is located near the second end of the rail.

[0198] The first end of the acquisition device is connected to the second section of the second voltage transformer, the second end is connected to the second end of the fourth voltage transformer, and the third end is connected to the second end of the data transmission path, for receiving the second voltage and the fourth voltage and transmitting the second voltage and the fourth voltage to the ranging device.

[0199] The first end of the ranging device is connected to the second end of the contact wire current transformer, the second end is connected to the second end of the negative feeder current transformer, the third end is connected to the second end of the first voltage transformer, the fourth end is connected to the second end of the third voltage transformer, and the fifth end is connected to the first end of the data transmission path. The ranging device operates as follows: Figure 2 The corresponding steps.

[0200] Additionally, it should be noted that within each AT railway section, a single-track railway requires at least two autotransformers (ATs) per power supply arm. The AT at the substation outlet can be omitted, and the ATs of any two adjacent AT railway sections can be shared. Therefore, the number of ATs in each AT railway section can be at least two. For example, it could be... Figure 3bThe three ATs can also be four ATs (as is commonly used in Japan), depending on the actual situation. No specific restrictions are set here.

[0201] In some embodiments, the data transmission path is a fiber optic channel. The data transmission path can be a wired or wireless connection. When using a wired connection, optical fiber can be used as the material for the data exchange path. When using a wireless connection, the connection method can include, but is not limited to, 3G / 4G / 5G connections, WiFi connections, Bluetooth connections, WiMAX connections, Zigbee connections, UWB (ultra-wideband) connections, and other currently known or future wireless connection methods. Due to the massive amount of data generated during operation, wired connections using optical fiber are often employed.

[0202] In addition, during actual operation, the following three methods can be used to calculate the short-circuit fault distance:

[0203] a. The data acquisition device sends the acquired data to the ranging device, which then calculates the short-circuit fault distance;

[0204] b. The ranging device sends the collected data to the acquisition device, which then calculates the short-circuit fault distance;

[0205] c. The ranging device sends the collected data to the acquisition device. At the same time, the ranging device sends the collected data to the acquisition device. The two devices work together to calculate the data and send the result of the calculation to the preset central computing device.

[0206] Since ranging devices are often located at stations and have strong computing power, while detection devices may be located at small data collection points in the middle of the route and have weaker computing power, either calculation method a or c is often used in actual operation.

[0207] In some embodiments, the system further includes a central computing device, which is connected to a second end of the acquisition device and a fourth end of the ranging device.

[0208] The ranging device is also used to transmit the contact wire current and the first voltage to the acquisition device, and the acquisition device is also used to implement the steps of the method as described in any one of claims 1 to 4 when it is in operation.

[0209] The central computing device simultaneously receives the first short-circuit fault distance calculated by the ranging device and the second short-circuit fault distance calculated by the acquisition device. An alarm is issued when the difference between the first and second short-circuit fault distances exceeds a preset first threshold. The first short-circuit fault distance can refer to the short-circuit fault distance calculated by the ranging device. The second short-circuit fault distance can refer to the short-circuit fault distance calculated by the acquisition device. Under normal operating conditions, the two calculation results should be equal. When they are not equal, an alarm message needs to be issued for subsequent processing, such as manual intervention.

[0210] The functions described above in this document can be performed, at least in part, by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: Field Programmable Gate Arrays (FPGAs), Application-Specific Integrated Circuits (ASICs), Application Standard Products (ASSPs), System-on-Chip (SoCs), Complex Programmable Logic Devices (CPLDs), and so on.

[0211] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A fault location method using the reclosing current of the AT traction network, characterized in that, The method includes: When a reclosing operation is detected, the circuit parameters of the target rail, target contact wire, and target negative feeder after the reclosing operation are acquired to determine whether a permanent short-circuit fault has occurred in the target AT traction network. The circuit parameters include the contact wire current at the first end of the target contact wire, the negative feeder current at the first end of the target negative feeder, a first voltage representing the potential difference between the first end of the target contact wire and the first end of the target rail, a second voltage representing the potential difference between the second end of the target contact wire and the second end of the target rail, and a third voltage representing the potential difference between the first end of the target negative feeder and the first end of the target rail. The method for determining whether a permanent short-circuit fault has occurred in the target AT traction network includes: acquiring a first standard voltage and a third standard voltage corresponding to the first voltage and the third voltage respectively during normal operation; within a first time period after the reclosing operation, if the first voltage difference between the first voltage and the first standard voltage is not greater than a preset first threshold, and the second voltage difference between the third voltage and the third standard voltage is not greater than a preset second threshold, it indicates that no permanent fault has occurred; otherwise, it indicates that a permanent fault has occurred. If a permanent short-circuit fault is determined, the fault type of the permanent short-circuit fault is determined based on the circuit parameters; In the event of a confirmed permanent short-circuit fault, determining the fault type based on the circuit parameters includes: if the first voltage difference is greater than or equal to a preset voltage threshold, and the second voltage difference is not greater than a preset second threshold, the fault type is a first fault type, indicating a short-circuit fault between the target contact wire and the target rail; if the first voltage difference is not greater than the first threshold, and the second voltage difference is greater than or equal to the second threshold, the fault type is a second fault type, indicating a short-circuit fault between the target negative feeder and the target rail; if the first voltage difference is not greater than the first threshold, and the second voltage difference is not greater than the second threshold, the fault type is a third fault type, indicating a short-circuit fault between the target contact wire and the target negative feeder. Based on the preset calculation strategy, the fault type, and the circuit parameters, the short-circuit fault distance corresponding to the fault type is calculated.

2. The method according to claim 1, characterized in that, The circuit parameters also include a fourth voltage representing the potential difference between the second end of the target negative feeder and the second end of the target rail, a contact line impedance representing the impedance per kilometer of the target contact line, a rail impedance representing the impedance per kilometer of the target rail, a negative feeder impedance representing the impedance per kilometer of the target negative feeder, a first mutual impedance representing the mutual impedance per kilometer of the target contact line and the target rail, a second mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target rail, and a third mutual impedance representing the mutual impedance per kilometer of the target negative feeder and the target contact line.

3. The method according to claim 2, characterized in that, The calculation strategy includes: If the fault type is the first fault type, the short-circuit fault distance between the contact wire and the target rail is calculated using the contact wire current, the first voltage, the second voltage, the contact wire impedance, the rail impedance, the first mutual impedance, and a preset first calculation formula, wherein the first calculation formula is: in, y Indicates the short-circuit fault distance. This indicates the contact wire current. This represents the first voltage. This indicates the second voltage. This indicates the impedance of the contact wire. This indicates the rail impedance. This represents the first mutual impedance.

4. The method according to claim 2, characterized in that, The calculation strategy also includes: If the fault type is the second fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the negative feeder current, the third voltage, the fourth voltage, the negative feeder impedance, the rail impedance, the second mutual impedance, and a preset second calculation formula. The second calculation formula is: in, y Indicates the short-circuit fault distance. This represents the negative feeder current. This refers to the third voltage. This refers to the fourth voltage. This represents the impedance of the negative feeder. This indicates the rail impedance. This represents the second mutual impedance.

5. The method according to claim 2, characterized in that, The calculation strategy also includes: If the fault type is the third fault type, the short-circuit fault distance between the negative feeder and the target rail is calculated using the contact wire current, negative feeder current, first voltage, second voltage, third voltage, fourth voltage, contact wire impedance, negative feeder impedance, rail impedance, third mutual impedance, and a preset third calculation formula. The third calculation formula is: in, y Indicates the short-circuit fault distance. This indicates the contact wire current. This represents the negative feeder current. This represents the first voltage. This indicates the second voltage. This refers to the third voltage. This refers to the fourth voltage. This indicates the impedance of the contact wire. This represents the impedance of the negative feeder. This represents the third mutual impedance.

6. A fault location device utilizing the reclosing current of an AT traction network, characterized in that, The fault location device includes: The first judgment module is used to obtain the circuit parameters of the target rail, target contact wire and target negative feeder after the reclosing operation when the reclosing operation is detected, and to determine whether the target AT traction network has a permanent short circuit fault. The circuit parameters include the contact wire current at the first end of the target contact wire, the negative feeder current at the first end of the target negative feeder, a first voltage representing the potential difference between the first end of the target contact wire and the first end of the target rail, a second voltage representing the potential difference between the second end of the target contact wire and the second end of the target rail, and a third voltage representing the potential difference between the first end of the target negative feeder and the first end of the target rail. The method for determining whether a permanent short-circuit fault has occurred in the target AT traction network includes: acquiring a first standard voltage and a third standard voltage corresponding to the first voltage and the third voltage respectively during normal operation; within a first time period after the reclosing operation, if the first voltage difference between the first voltage and the first standard voltage is not greater than a preset first threshold, and the second voltage difference between the third voltage and the third standard voltage is not greater than a preset second threshold, it indicates that no permanent fault has occurred; otherwise, it indicates that a permanent fault has occurred. The second judgment module is used to determine the fault type of the permanent short circuit fault based on the circuit parameters when it is determined that a permanent short circuit fault has occurred. In the event of a confirmed permanent short-circuit fault, determining the fault type based on the circuit parameters includes: if the first voltage difference is greater than or equal to a preset voltage threshold, and the second voltage difference is not greater than a preset second threshold, the fault type is a first fault type, indicating a short-circuit fault between the target contact wire and the target rail; if the first voltage difference is not greater than the first threshold, and the second voltage difference is greater than or equal to the second threshold, the fault type is a second fault type, indicating a short-circuit fault between the target negative feeder and the target rail; if the first voltage difference is not greater than the first threshold, and the second voltage difference is not greater than the second threshold, the fault type is a third fault type, indicating a short-circuit fault between the target contact wire and the target negative feeder. The calculation module is used to calculate the short-circuit fault distance corresponding to the fault type based on a preset calculation strategy, the fault type, and the circuit parameters.

7. A fault location system utilizing the reclosing current of the AT traction network, characterized in that, It includes a contact line current transformer, a negative feeder current transformer, a first voltage transformer, a second voltage transformer, a third voltage transformer, a fourth voltage transformer, a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker, a sixth circuit breaker, a first autotransformer, a second autotransformer, a data acquisition device, a ranging device, and a data transmission path. The first end of the contact wire current transformer is connected to the first end of the target contact wire, and is used to measure the contact wire current at the first end of the target contact wire and transmit the contact wire current to the ranging device. The first end of the negative feeder current transformer is connected to the first end of the target negative feeder, and is used to measure the negative feeder current at the first end of the target negative feeder and transmit the negative feeder current to the ranging device. The first end of the first voltage transformer is connected to the first end of the target contact wire, and is used to measure the first voltage between the first end of the target contact wire and the first end of the target rail, and transmit the first voltage to the ranging device. The first end of the second voltage transformer is connected to the second end of the target contact wire, and is used to measure the second voltage between the second end of the target contact wire and the second end of the target rail, and transmit the second voltage to the acquisition device. The first end of the third voltage transformer is connected to the first end of the target negative feeder, and is used to measure the third voltage between the first end of the target negative feeder and the first end of the target rail, and transmit the third voltage to the ranging device. The first end of the fourth voltage transformer is connected to the second end of the target negative feeder, and is used to measure the fourth voltage between the second end of the target negative feeder and the second end of the target rail, and transmit the fourth voltage to the acquisition device. The first circuit breaker is located at the first end of the target contact wire and is used to control the opening / closing state of the target contact wire. The second circuit breaker is located at the first end of the target negative feeder and is used to control the open / closed state of the target negative feeder; The first end of the first autotransformer is connected to the target contact line through the third circuit breaker, its second end is connected to the target rail, and its third end is connected to the target negative feeder through the fourth circuit breaker to increase the voltage. The first end of the first autotransformer is close to the rail. The first end of the second autotransformer is connected to the target contact line through the fifth circuit breaker, the second end is connected to the target rail, and the third end is connected to the target negative feeder through the sixth circuit breaker to increase the voltage. The first autotransformer is located near the second end of the rail. The first end of the acquisition device is connected to the second section of the second voltage transformer, the second end is connected to the second end of the fourth voltage transformer, and the third end is connected to the second end of the data transmission path, for receiving the second voltage and the fourth voltage and transmitting the second voltage and the fourth voltage to the ranging device. The first end of the ranging device is connected to the second end of the contact wire current transformer, the second end is connected to the second end of the negative feeder current transformer, the third end is connected to the second end of the first voltage transformer, the fourth end is connected to the second end of the third voltage transformer, and the fifth end is connected to the first end of the data transmission path. When the ranging device is running, it implements the steps of the method as described in claim 1 or 2.

8. The system according to claim 7, characterized in that, The data transmission path is an optical fiber channel.

9. The system according to claim 7, characterized in that, The system also includes a central computing device, which is connected to the second end of the acquisition device and the fourth end of the ranging device, respectively. The ranging device is also used to transmit the contact wire current and the first voltage to the acquisition device, and the acquisition device is also used to implement the steps of the method as described in any one of claims 1 to 5 during operation; The central computing device is used to simultaneously receive the first short-circuit fault distance calculated by the ranging device and the second short-circuit fault distance calculated by the acquisition device, and to issue an alarm when the difference between the first short-circuit fault distance and the second short-circuit fault distance is greater than a preset first threshold.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5.

11. A computer program product, said computer program product comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed by a processor, they implement the steps of the method as described in any one of claims 1 to 5.

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