Subway steel rail ground short circuit abnormity monitoring method, system, equipment and program

Abstract

The invention discloses a method, a system, equipment and a program for monitoring an abnormal short circuit to ground of a subway steel rail. The method comprises the following steps: acquiring data of to-be-tested power supply stations and sampling points between the to-be-tested power supply stations; wherein the data of the to-be-tested power supply station comprises voltage to ground of a steel rail and feed-out current; the data of the sampling points comprises rail voltage to ground and sampling point spacing; obtaining the position of the train based on the feed-out current of the to-be-tested power supply station and the sampling point distance; and obtaining a short-circuit point position based on the train position, the rail-to-ground voltage of the to-be-measured power supply station and the rail-to-ground voltage of the sampling point. Through the processing scheme disclosed by the invention, the position of the rail-to-ground short circuit point can be quickly and accurately identified, and the increase of the stray current is effectively analyzed, so that a more reliable abnormality positioning and risk management scheme is provided for a power system.

Description

Technical Field

[0001] The present invention relates to the technical field of subway rail monitoring, and particularly to a method, system, device and program for monitoring abnormal ground short - circuit of subway rails. Background Art

[0002] In the subway system, the abnormal ground short - circuit of rails not only affects the normal operation of the power system, but also leads to an increase in stray current, thus causing a series of problems. The increase in stray current can cause abnormalities in power equipment, reduce system efficiency, and long - term leakage may damage the equipment and even pose a threat to personal safety. Existing short - circuit point location methods mostly rely on traditional manual inspections, which not only have the disadvantage of insufficient accuracy, but also cannot capture the specific location of the short - circuit point in real - time and accurately, making it difficult to deal with effectively in a timely manner.

[0003] Therefore, it can be seen that how to develop a new and accurate measurement method has become an urgent goal to be improved in the current industry. Summary of the Invention

[0004] In view of this, embodiments of the present disclosure provide a method for monitoring abnormal ground short - circuit of subway rails, which at least partially solves the problems existing in the prior art.

[0005] In a first aspect, embodiments of the present disclosure provide a method for monitoring abnormal ground short - circuit of subway rails, the method comprising the following steps: Obtain data of sampling points between the power supply stations to be measured; wherein, the data of the power supply stations to be measured includes the voltage of the rail to the ground and the outgoing current; the data of the sampling points includes the voltage of the rail to the ground and the sampling point spacing; Obtain the train position based on the outgoing current of the power supply stations to be measured and the sampling point spacing; Obtain the short - circuit point position based on the train position, the voltage of the rail to the ground of the power supply stations to be measured, and the voltage of the rail to the ground of the sampling points.

[0006] According to a specific implementation manner of the embodiments of the present disclosure, the obtaining of the train position based on the outgoing current of the power supply stations to be measured is obtained through the following steps: ; wherein, L is the train position; is the outgoing current of the first power supply station; is the outgoing current of the second power supply station; n is the number of sampling points; is the distance between the nth sampling point and the (n + 1)th sampling point, is the distance between the first power supply station and the first sampling point.

[0007] According to a specific implementation manner of the embodiments of the present disclosure, the method includes: determining the sampling interval where the current train is located; Among them, when is satisfied, the train is within the section; Among them, m is the m-th sampling point; i is the sampling point serial number; is the distance between the i-th sampling point and the (i - 1)-th sampling point; is the distance between the m-th sampling point and the (m - 1)-th sampling point.

[0008] According to a specific implementation manner of an embodiment of the present disclosure, obtaining the short-circuit point position based on the train position, the rail-to-ground voltage of the power supply station to be measured, and the rail-to-ground voltage of the sampling point includes: Determine whether there is an abnormality in the subway rail-to-ground short circuit; among them, when there is an abnormality in the subway rail-to-ground short circuit, determine the short-circuit point position.

[0009] According to a specific implementation manner of an embodiment of the present disclosure, determining whether there is an abnormality in the subway rail-to-ground short circuit includes: Obtain the data of the sampling points between the power supply station to be measured and the power supply station to be measured at a preset frequency; Fit the rail-to-ground voltage of the first power supply station and the rail-to-ground voltage of the sampling points from the first power supply station to the train position to construct a first parameter matrix; Solve the first parameter matrix in the order of sampling time to obtain a first parameter vector sequence; Reconstruct a parameter matrix respectively based on two adjacent parameter vectors in the first parameter vector sequence; Solve the reconstructed parameter matrix to obtain a second parameter vector sequence; Determine whether there is an abnormality in the subway rail-to-ground short circuit based on the second parameter vector sequence.

[0010] According to a specific implementation manner of an embodiment of the present disclosure, determining whether there is an abnormality in the subway rail-to-ground short circuit based on the second parameter vector sequence includes: When the numerical difference between two adjacent parameters , in the second parameter vector sequence is greater than a first threshold, it is determined that there is no abnormality in the subway rail-to-ground short circuit; When the numerical difference between two adjacent parameters , in the second parameter vector sequence is less than the first threshold, compare the numerical value of the next parameter in the second parameter vector sequence with the average value of the numerical values of two adjacent parameters , ; When the numerical value of the next parameter in the second parameter vector sequence and two adjacent parameters , When the difference in the average values of the numerical values is less than the first threshold, it is determined that there is an abnormality in the short circuit between the subway rail and the ground.

[0011] According to a specific implementation manner of the embodiments of the present disclosure, when there is an abnormality in the short circuit between the subway rail and the ground, the position of the short circuit point is located in the train direction from the first power supply station distance.

[0012] In a second aspect, an embodiment of the present disclosure provides a subway rail-to-ground short circuit abnormality monitoring system, the system includes: A data acquisition module, configured to acquire data of sampling points between the power supply stations to be measured and the power supply stations to be measured; wherein, the data of the power supply stations to be measured includes the voltage between the rail and the ground and the outgoing current; the data of the sampling points includes the voltage between the rail and the ground and the sampling point spacing; A calculation module, configured to obtain the train position based on the outgoing current of the power supply station to be measured and the sampling point spacing; and, Obtain the short circuit point position based on the train position, the voltage between the rail and the ground of the power supply station to be measured, and the voltage between the rail and the ground of the sampling point.

[0013] In a third aspect, an embodiment of the present disclosure further provides an electronic device, the electronic device includes: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor executes the subway rail-to-ground short circuit abnormality monitoring method described in any one of the first aspect or any implementation manner of the first aspect.

[0014] In a fourth aspect, an embodiment of the present disclosure further provides a computer program product, the computer program product includes a computing program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes the subway rail-to-ground short circuit abnormality monitoring method described in the first aspect or any implementation manner of the first aspect.

[0015] The subway rail-to-ground short circuit abnormality monitoring method in the embodiments of the present disclosure can quickly and accurately identify the position of the short circuit point between the rail and the ground, and effectively analyze the increase of stray current, so as to provide a more reliable abnormality positioning and risk management solution for the power system, and ensure the safe and stable operation of the subway system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above is only an overview of the technical solutions of the present invention. In order to be able to understand the technical means of the present invention more clearly, the following further describes the present invention in detail with reference to the drawings and specific embodiments.

[0017] Figure 1 Schematic diagram of a subway rail potential limiting device provided by an embodiment of the present disclosure; Figure 2 Schematic flow diagram of a method for monitoring abnormal subway rail-to-ground short circuits provided by an embodiment of the present disclosure; Figure 3 Schematic diagram of the ground voltage at a sampling point with two power supply stations provided by an embodiment of the present disclosure; Figure 4 Schematic diagram of the distance of the sampling point with two power supply stations at a sampling point provided by an embodiment of the present disclosure; Figure 5 Schematic diagram of monitoring abnormal subway rail-to-ground short circuits at three sampling points with two power supply stations provided by an embodiment of the present disclosure; Figure 6 Schematic structural diagram of a system for monitoring abnormal subway rail-to-ground short circuits provided by an embodiment of the present disclosure; Figure 7 Schematic diagram of an electronic device provided by an embodiment of the present disclosure. Detailed implementation manners

[0018] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0019] The following uses specific specific examples to illustrate the implementation manners of the present disclosure. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0020] It should be noted that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. In addition, this device and / or practice of this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0021] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0022] An embodiment of the present invention provides a method for monitoring abnormal short circuits between subway rails and the ground. The potential between the rail and the structural steel bars (ground) is detected by a rail limiting device fixedly installed in each station (as shown in Figure 1 ). When the potential exceeds the set value, the device will short-circuit and ground the rail to release the rail potential to ensure personal safety. At the same time, the present invention needs to receive the rail potential information with time stamps from each station through the background for analysis.

[0023] Figure 2 It is a schematic diagram of the process of the method for monitoring abnormal short circuits between subway rails and the ground provided by the embodiments of the present disclosure.

[0024] As shown in Figure 2 , at step S210, data of the sampling points between the power supply stations to be measured and the power supply stations to be measured are acquired; wherein, the data of the power supply stations to be measured include the voltage between the rail and the ground and the outgoing current; the data of the sampling points include the voltage between the rail and the ground and the sampling point spacing.

[0025] More specifically, as shown in Figure 3 , it is a schematic diagram of the present invention with two power supply stations (Station A, Station C) and one sampling point (Station B).

[0026] The voltages between the rail and the ground of Stations A, B, and C are respectively collected as U A , U B , U C、 . The distance between the sampling points is , . Since the telemetry values with time stamps are collected by the background, it is necessary to unify the time stamp information to obtain the rail-to-ground potential information of the three stations at the same moment.

[0027] More specifically, then proceed to step S220.

[0028] At step S220, the train position is obtained based on the outgoing current of the power supply stations to be measured and the sampling point spacing.

[0029] In the embodiment of the present invention, the train position is obtained based on the outgoing current of the power supply stations to be measured through the following steps: ; wherein, L is the train position; is the outgoing current of the first power supply station; is the outgoing current of the second power supply station; n is the number of sampling points; is the distance between the nth sampling point and the (n + 1)th sampling point, is the distance between the first power supply station and the first sampling point.

[0030] In an embodiment of the present invention, the method includes: determining the sampling section where the current train is located; wherein, when is satisfied, the train is within the section; wherein, m is the m-th sampling point; i is the sampling point serial number; is the distance between the i-th sampling point and the (i - 1)-th sampling point; is the distance between the m-th sampling point and the (m - 1)-th sampling point.

[0031] More specifically, taking Figure 3 as an example, the above data and the outgoing currents I A , I c of power supply stations A and C are collected every once in a while (usually set to 5 s), and the train position L is inferred using the following formula:

[0032] If , it is determined that the train is within the AB section If it is determined that the train is within the BC section.

[0033] If the above conditions are not satisfied, it proves that it is not suitable for protection measurement at this time, and this data is skipped.

[0034] Next, go to step S230.

[0035] At step S230, the short - circuit point position is obtained based on the train position, the rail - to - ground voltage of the power supply station to be measured, and the rail - to - ground voltage of the sampling point.

[0036] In an embodiment of the present invention, obtaining the short - circuit point position based on the train position, the rail - to - ground voltage of the power supply station to be measured, and the rail - to - ground voltage of the sampling point includes: determining whether there is an abnormality in the subway rail - to - ground short - circuit; wherein, when there is an abnormality in the subway rail - to - ground short - circuit, determining the short - circuit point position.

[0037] In an embodiment of the present invention, determining whether there is an abnormality in the subway rail - to - ground short - circuit includes: acquiring data of the power supply station to be measured and sampling points between the power supply stations to be measured at a preset frequency; fitting the rail - to - ground voltage of the first power supply station and the rail - to - ground voltages of the sampling points from the first power supply station to the train position to construct a first parameter matrix; solving the first parameter matrix according to the sampling time sequence to obtain a first parameter vector sequence; respectively reconstructing a parameter matrix based on two adjacent parameter vectors in the first parameter vector sequence; solving the reconstructed parameter matrix to obtain a second parameter vector sequence; and determining whether there is an abnormality in the subway rail - to - ground short - circuit based on the second parameter vector sequence.

[0038] In an embodiment of the present invention, determining whether there is an abnormality in the short circuit of the subway rail to the ground based on the second parameter vector sequence includes: when the numerical difference between two adjacent parameters in the second parameter vector sequence , is greater than a first threshold, it is determined that there is no abnormality in the short circuit of the subway rail to the ground; when the numerical difference between two adjacent parameters in the second parameter vector sequence , is less than the first threshold, the numerical value of the next parameter in the second parameter vector sequence is compared with the average value of the numerical values of two adjacent parameters , ; when the difference between the numerical value of the next parameter in the second parameter vector sequence and the average value of the numerical values of two adjacent parameters , is less than the first threshold, it is determined that there is an abnormality in the short circuit of the subway rail to the ground.

[0039] In an embodiment of the present invention, when there is an abnormality in the short circuit of the subway rail to the ground, the position of the short circuit point is located at the distance in the train direction from the first power supply substation .

[0040] More specifically, taking Figure 3 as an example, after obtaining the train position, if the train is within the AB section, then U B , U C of the two substations can be used to calculate and determine whether there is a ground short circuit point in the BC section: If the train is within the BC section, then U A , U B of the two substations can be used to calculate and determine whether there is a ground short circuit point in the AB section: Calculate the possible position of the short circuit point in the AB section :

[0041] Calculate the possible position of the short circuit point in the BC section :

[0042] Record the short circuit point position at the first moment into the array of the corresponding section, wait for the data at the second moment (usually set to be collected after 5 s), repeat the above operations, and obtain the possible position of the short circuit point in the AB section at the second moment or the possible position of the short circuit point in the BC section at the second moment : If the position of the short-circuit point at the second moment is very different from that at the first moment (more than 5% before and after), it indicates that the line is normal and there is no abnormality.

[0043] If the difference between the position of the short-circuit point at the second moment and that at the first moment is within 5% before and after, it indicates that there may be an abnormality in the line; continue to wait for the position of the short-circuit point at the third moment. If the position of the short-circuit point at the third moment is still within 5% before and after the average value of the position of the short-circuit point at the second moment and that at the first moment, it indicates that there is a ground short-circuit abnormality in the line: If the train is within the AB section: it is the place at the distance to the right of Substation A where an abnormality occurs.

[0044] If the train is within the BC section: it is the place at the distance to the right of Substation B where an abnormality occurs.

[0045] The above is the case where there is only one sampling point in the line. If there are more than one sampling points in the line, as Figure 5 shown, it is necessary to perform fitting calculation using a matrix: That is, if there are n sampling points in the line, the line is divided into n + 1 sections, and the voltages U A , U B …U n+2 can be detected. The sampling point spacings are known, which are , , …L n+1 . For the convenience of matrix calculation, L here represents the distance of the train from the left power supply substation.

[0046] Every once in a while, generally set to 5s, collect the above data and the outgoing currents I A , I B of the two power supply substations A and B, and infer the train position L using the following formula:

[0047] If , it is determined that the train is within section 1.

[0048] If and , it is determined that the train is within section 2.

[0049] If and , it is determined that the train is within section 3.

[0050] And so on. That is, if and , it is determined that the train is within section .

[0051] The obtained section where the train is located is After that, matrix fitting is performed on the voltages to the ground on both sides of the section.

[0052] First, obtain the distances and voltages of each sampling point on the left side of the section from Substation A. The left side of the section is (0, U A ), ([[]] , U B ), ([[]] , U C ), …, (L m-1 , U m ); The right side of the section is (L m , U m+1 ), (L m+1 , U m+2 ), …, (L n , U n+1 ).

[0053] First, construct the parameter matrix for the left section as:

[0054] where x is the vector of unknown parameters. Solve the parameter matrix:

[0055] Note that E is not of full rank. Utilize the projection principle of the matrix, i.e.:

[0056] Solve for the parameter vector After that, wait for the next new data and continue to solve for , k1, k2, k3, , , which are the parameters of the two-dimensional vector.

[0057] Utilize , to reconstruct the parameter matrix as:

[0058] where y is the vector of unknown parameters, is the fault distance; is the calculated voltage of the fault point to the ground, expected to be 0; Solve the parameter matrix: ​

[0059] Obviously, F is full rank, then:

[0060] Solve for the parameters .

[0061] After obtaining the new data, use , Repeat the above operations to obtain the parameters , and so on.

[0062] If and The difference is greater than 5% before and after, indicating that the line is normal and there is no abnormality.

[0063] If the obtained and The difference is within 5% before and after, indicating that there may be an abnormality in the line. Continue to wait for the next ; If The average value still has a difference within 5% before and after, indicating that there is a ground short circuit abnormality in the line, and the abnormality occurs at a distance of from point A.

[0064] The present invention will be described in detail below with reference to embodiments.

[0065] As Figure 3 , Figure 4 shown, when = 1000, = 2600, the data obtained in the case of the blue line is I A = 234.3 A, Ic = 66.2 A, U A = -12.2 V, U B = 7.1 V, U C = -12.1 V.

[0066] The data obtained in the case of the orange line is I A = 105.7 A, Ic = 195.4 A, U A = -35.3 V, U B = 21 V, U C = -35.1 V.

[0067] Then, for the blue line case, the estimated train position is:

[0068] Obviously, 189.8 < 900, it is estimated that the train is in the AB section.

[0069] For the orange line case, the estimated train position is:

[0070] Obviously, 584.2 < 900, so it is speculated that the train is in the AB section.

[0071] Since the train is in the AB section, first calculate the :

[0072] Then calculate the orange line :

[0073] Obviously at this time, the new is within the 5% error range before and after the old (upper limit: 591.67 * 1.05 = 621.25, lower limit: 591.67 * 0.95 = 562.08). Then, when the value of the next also falls within the and average value ((591.67 + 596.80) / 2 = 594.24) within the 5% error range, it proves that there is an abnormal point of the voltage to the ground, and the position is 594.24 m to the right of Substation B.

[0074] As Figure 5 shown, there are 3 sampling points in the figure, that is, n = 3. For the data of the blue line, they are respectively: U A = -35.3 V, U B = 28.04 V, U C = 13.98 V, U D = -13.99 V, U E = -35.11 V = 800, = 1200, L3 = 2000, L4 = 2600, I A = 104.2 A, I B = 193.9 A.

[0075] Speculate the train position L:

[0076] Obviously, L < 0.9 * = 720, so it is speculated that the train is in section 1, m = 1.

[0077] Since there is only 1 sampling point on the left side of the train and the number is too small, only fit the voltage matrix to the ground on the right side of the train: Construct the parameter matrix and the quantity to be solved x: ; ;

[0078] Solve for x:

[0079] The second curve: I A = 132.6 A, I B = 167.9 A, U A = -57.45 V, U B = 16.42 V, U C = 23.23 V, U D = -22.88 V, U E = -57.44 V.

[0080] Estimate the train position L:

[0081] Obviously, L > + * 0.1 = 920, L < + * 0.9 = 1880, it is estimated that the train is in section 2, m = 2.

[0082] Still taking the matrix of the voltage to the ground on the right side of the train as an example: Construct the parameter matrix and the quantity x to be solved: ; ;

[0083] Solve for x:

[0084] Now two and are known, construct the parameter matrix and the coefficient y to be solved: ;

[0085] Solve for y:

[0086] Obtain = 1577.39. If is obtained continuously, then use , Solve for . If falls within the error range of 5% before and after , it is speculated that there may be a fault in the line. If is obtained continuously, then use , Solved Falls within + ) / 2 within an error range of 5% before and after, indicating that there is an abnormal short circuit to the ground in the line, and the abnormality occurs at a distance from Substation A At the place of the distance.

[0087] Figure 6 Fig. 600 shows a subway rail short - circuit - to - ground abnormality monitoring system 600 provided by the present invention, including a data acquisition module 610 and a calculation module 620.

[0088] The data acquisition module 610 is used to acquire data of sampling points between the power supply substations to be measured; among them, the data of the power supply substations to be measured includes the rail - to - ground voltage and the outgoing current; the data of the sampling points includes the rail - to - ground voltage and the sampling point spacing; The calculation module 620 is used to obtain the train position based on the outgoing current of the power supply substation to be measured and the sampling point spacing; and, obtain the short - circuit point position based on the train position, the rail - to - ground voltage of the power supply substation to be measured, and the rail - to - ground voltage of the sampling point.

[0089] Refer to Figure 7 , this embodiment of the present disclosure also provides an electronic device 70, which includes: At least one processor; and, A memory communicatively connected to the at least one processor; where The memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the subway rail short - circuit - to - ground abnormality monitoring method in the foregoing method embodiment.

[0090] This embodiment of the present disclosure also provides a non - transitory computer - readable storage medium, which stores computer instructions for causing the computer to execute the subway rail short - circuit - to - ground abnormality monitoring method in the foregoing method embodiment.

[0091] This embodiment of the present disclosure also provides a computer program product, which includes a computing program stored on a non - transitory computer - readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a computer, the computer is caused to execute the subway rail short - circuit - to - ground abnormality monitoring method in the foregoing method embodiment.

[0092] Next, refer to Figure 7, which shows a schematic structural diagram of an electronic device 70 suitable for implementing the embodiments of the present disclosure. The electronic devices in the embodiments of the present disclosure may include, but are not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Tablet Computers), PMPs (Portable Multimedia Players), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The electronic device shown is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present disclosure.

[0093] As Figure 7 shown, the electronic device 70 may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 701, which may perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 702 or the program loaded from the storage device 708 into the random access memory (RAM) 703. In the RAM 703, various programs and data required for the operation of the electronic device 70 are also stored. The processing device 701, the ROM 702, and the RAM 703 are connected to each other through a bus 704. The input / output (I / O) interface 705 is also connected to the bus 704.

[0094] Generally, the following devices may be connected to the I / O interface 705: an input device 706 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 707 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 708 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 709. The communication device 709 may allow the electronic device 70 to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows an electronic device 70 having various devices, it should be understood that it is not required to implement or include all the shown devices. More or fewer devices may be alternatively implemented or included.

[0095] Specifically, according to the embodiments of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, the embodiments of the present disclosure include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from the network through the communication device 709, or installed from the storage device 708, or installed from the ROM 702. When the computer program is executed by the processing device 701, the above functions defined in the methods of the embodiments of the present disclosure are executed.

[0096] It should be noted that the above-mentioned computer-readable medium in the present disclosure can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present disclosure, the computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, and this computer-readable signal medium can send, propagate, or transmit a program for use by or in conjunction 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 cables, RF (radio frequency), etc., or any suitable combination of the above.

[0097] The above-mentioned computer-readable medium can be included in the above-mentioned electronic device; or it can exist separately without being assembled into the electronic device.

[0098] The above-mentioned computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device is caused to: obtain at least two Internet protocol addresses; send a node evaluation request including the at least two Internet protocol addresses to a node evaluation device, where the node evaluation device selects an Internet protocol address from the at least two Internet protocol addresses and returns it; receive the Internet protocol address returned by the node evaluation device; where the obtained Internet protocol addresses indicate edge nodes in a content delivery network.

[0099] Alternatively, the above computer-readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: receive a node evaluation request including at least two Internet Protocol addresses; select an Internet Protocol address from the at least two Internet Protocol addresses; return the selected Internet Protocol address; wherein the received Internet Protocol addresses indicate edge nodes in a content delivery network.

[0100] Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0101] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a portion of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that, in some alternative implementations, the functions noted in the blocks may occur in a different order than noted in the drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or by a combination of dedicated hardware and computer instructions.

[0102] The units described in the embodiments of the present disclosure may be implemented in software or in hardware. Wherein, the name of the unit does not, in some cases, constitute a limitation on the unit itself. For example, the first acquisition unit may also be described as "the unit for acquiring at least two Internet Protocol addresses".

[0103] It should be understood that the various parts of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof.

[0104] As described above, this is only a specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present disclosure should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A method for monitoring abnormal ground short - circuit of subway rails, characterized in that, The method includes the following steps: Obtain data of sampling points between the power supply stations to be measured and the power supply stations to be measured; wherein, the data of the power supply stations to be measured includes the voltage of the rail to the ground and the outgoing current; the data of the sampling points includes the voltage of the rail to the ground and the sampling point spacing; Obtain the train position based on the outgoing current of the power supply station to be measured and the sampling point spacing; Obtain the short-circuit point position based on the train position, the voltage of the rail to the ground of the power supply station to be measured, and the voltage of the rail to the ground of the sampling point; 2. The subway rail-to-ground short-circuit anomaly monitoring method according to claim 1, characterized in that The obtaining of the train position based on the outgoing current of the power supply station to be measured is obtained through the following steps: ； Among them, L is the train position; is the outgoing current of the first power supply station; is the outgoing current of the second power supply station; n is the number of sampling points; is the distance between the nth sampling point and the (n + 1)th sampling point, is the distance between the first power supply station and the first sampling point.

3. The subway rail-to-ground short-circuit anomaly monitoring method according to claim 2, characterized in that, The method includes: judging the sampling interval where the current train is located; Among them, when is satisfied, the train is in section; Among them, m is the m-th sampling point; i is the sampling point serial number; is the distance between the i-th sampling point and the (i - 1)-th sampling point; is the distance between the m-th sampling point and the (m - 1)-th sampling point.

4. The subway rail-to-ground short-circuit anomaly monitoring method according to claim 1, characterized in that The obtaining of the short-circuit point position based on the train position, the voltage of the rail to the ground of the power supply station to be measured, and the voltage of the rail to the ground of the sampling point includes: Judge whether there is an abnormality in the short circuit of the subway rail to the ground; wherein, when there is an abnormality in the short circuit of the subway rail to the ground, judge the short-circuit point position; 5. The subway rail-to-ground short-circuit anomaly monitoring method according to claim 4, wherein The judging whether there is an abnormality in the short circuit of the subway rail to the ground includes: Obtain data of sampling points between the power supply stations to be measured and the power supply stations to be measured at a preset frequency; Fit the voltage of the rail to the ground of the first power supply station and the voltage of the rail to the ground of the sampling points from the first power supply station to the train position to construct a first parameter matrix; Solve the first parameter matrix in the order of sampling time to obtain a first parameter vector sequence; Based on two adjacent parameter vectors in the first parameter vector sequence, respectively reconstruct a parameter matrix; Solve the reconstructed parameter matrix to obtain a second parameter vector sequence; Judge whether there is an abnormality in the short circuit of the subway rail to the ground based on the second parameter vector sequence; 6. The subway rail-to-ground short-circuit anomaly monitoring method according to claim 5, characterized in that, The judging whether there is an abnormality in the short circuit of the subway rail to the ground based on the second parameter vector sequence includes: When the numerical difference between two adjacent parameters in the second parameter vector sequence and is greater than the first threshold, it is determined that there is no abnormality in the short circuit of the subway rail to the ground; When the numerical difference between two adjacent parameters in the second parameter vector sequence is less than the first threshold, compare the numerical value of the next parameter in the second parameter vector sequence with the average value of the two adjacent parameters , and , ​​ When the next parameter value in the second parameter vector sequence differs from the average value of two adjacent parameters by less than the first threshold, it is determined that there is an abnormality in the short circuit of the subway rail to the ground.

7. The subway rail-to-ground short-circuit anomaly monitoring method according to claim 6, wherein When there is an abnormality in the short circuit of the subway rail to the ground, the position of the short circuit point is in the direction of the train from the first power supply substation at the distance.

8. A subway rail-to-ground short-circuit anomaly monitoring system, characterized in that, The system includes: A data acquisition module configured to obtain data of sampling points between the power supply stations to be measured and the power supply stations to be measured; wherein, the data of the power supply stations to be measured includes the voltage of the rail to the ground and the outgoing current; the data of the sampling points includes the voltage of the rail to the ground and the sampling point spacing; A calculation module configured to obtain the train position based on the outgoing current of the power supply station to be measured and the sampling point spacing; and Obtain the short-circuit point position based on the train position, the voltage of the rail to the ground of the power supply station to be measured, and the voltage of the rail to the ground of the sampling point; 9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor executes the subway rail-to-ground short-circuit abnormality monitoring method according to any one of claims 1 to 6; 10. A computer program product, characterized in that, The computer program product includes a computing program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes the subway rail-to-ground short-circuit abnormality monitoring method according to any one of claims 1 to 6.

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