Line test method for subway power supply system

Abstract

The invention provides a line test method for a subway power supply system, which comprises the following steps of: firstly, carrying out initialization processing on a power supply line of the power supply system which needs to be subjected to line test based on a detection condition of the line test, and carrying out line test on the initialized power supply line; and obtaining the residual resistance value, the accumulated heating value, the residual resistance difference value and the line test frequency of the power supply line. And then, analyzing the power supply line step by step according to the acquired parameters related to the power supply line. Wherein the line test result is judged based on the residual resistance value, the line test cycle result is judged based on the accumulated heating value, and the damage degree of the power supply line is judged based on the line test frequency and the residual resistance difference value. And finally, judging the fault type of the power supply line according to the line test result, the line test cycle result and the damage degree of the power supply line.

Description

Technical Field

[0001] The invention relates to a line testing method, in particular to a line testing method for a subway power supply system. Background Art

[0002] At present, in the existing technology, the subway power supply system usually adopts DC power supply, and the voltage level is usually 750V or 1500V, which is used to provide power for subway trains. This type of power supply system has a complex structure, heavy load, and harsh operating environment, and often encounters various forms of faults, especially metallic foreign body short-circuit faults. Once such a fault occurs, it will cause serious electrical safety problems, causing line tripping or power outages, affecting the normal operation of the subway. Therefore, how to quickly and accurately judge and handle such faults to ensure the safe and stable operation of the subway power supply system is one of the important technical problems that subway operating units urgently need to solve.

[0003] In the subway power supply system, metallic short circuit fault is one of the most common and dangerous fault types. This type of fault is usually caused by metallic foreign matter (such as iron filings, screws, tools, etc.), which may enter the power supply line due to the influence of the external environment (such as construction, train vibration, wind and sand, etc.), causing a short circuit between the positive and negative poles. When a metallic short circuit occurs, the current in the line will rise sharply, causing the system protection device to trip to avoid further damage.

[0004] However, short circuit faults do not always persist. In many cases, faulty materials (such as metal foreign objects) may only be temporarily present in the power supply line and lose contact over time or due to vibration of the equipment. Therefore, after the system trips, it becomes an important part of fault handling to determine whether the fault has been resolved or whether the foreign objects can be removed by powering on again. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, a first aspect of the present invention provides a line testing method for a subway power supply system.

[0007] A second aspect of the present invention provides a computer-readable storage medium.

[0008] In view of this, a first aspect of the present invention provides a line testing method for a subway power supply system, comprising: initializing the power supply line of the power supply system based on the detection conditions of the line test; performing a line test on the power supply line after the initialization process to obtain the residual resistance value, cumulative heat generation, residual resistance difference and number of line tests of the power supply line; judging the line test result based on the residual resistance value; judging the line test cycle result based on the cumulative heat generation; judging the degree of damage to the power supply line based on the number of line tests and the residual resistance difference; judging the fault type of the power supply line based on the line test result, the line test cycle result and the degree of damage to the power supply line.

[0009] In addition, the line testing method for a subway power supply system in the above technical solution provided by the present invention may also have the following additional technical features: In some technical schemes of the present invention, optionally, based on the detection conditions of the line test, the power supply line of the power supply system is initialized, including: detecting whether the power supply line is permanently locked; if the power supply line is not permanently locked, determining whether the power supply line meets the start conditions of the line test; if the power supply line meets the start conditions of the line test, the initialization processing of the power supply line is completed.

[0010] In some technical schemes of the present invention, optionally, it is determined whether the power supply line meets the starting conditions of the line test. If the power supply line meets the starting conditions of the line test, the initialization processing of the power supply line is completed, including: determining whether the power supply switch is disconnected. If the power supply switch is disconnected, verifying whether the line test function is put into use. If the line test function is put into use, it is determined that the power supply line meets the starting conditions of the line test, and the initialization processing of the power supply line is completed; wherein, the power supply switch is used to control the on and off of the power supply for the protection action tripping.

[0011] In some technical schemes of the present invention, optionally, a line test is performed on the power supply line after the initialization processing to obtain the residual resistance value, cumulative heat generation, residual resistance difference and line test times of the power supply line, including: performing incremental processing on the line test times, connecting a line test resistor in the power supply line, and supplying power to the power supply line; when the power supply time of the power supply line reaches a first preset time, obtaining the voltage value of the power supply line and the current value of the line test circuit, and obtaining the residual resistance value based on the voltage value and the current value; obtaining the cumulative heat generation based on the historical heat generation, the voltage value and the current value; obtaining the residual resistance difference based on the residual resistance value before the power supply line is powered on and the residual resistance value after the power supply line is powered on; wherein, the line test resistor is connected in parallel with the power switch.

[0012] In some technical solutions of the present invention, optionally, based on the residual resistance value, the line test result is judged, including: judging whether the residual resistance value is greater than the preset resistance value; if the residual resistance value is greater than the preset resistance value, judging that the line test result is successful, resetting the number of line tests; otherwise, time-marking the remaining resistance value.

[0013] In some technical schemes of the present invention, optionally, based on the cumulative heat generation, the line test cycle result is judged, including: judging whether the cumulative heat generation exceeds the preset maximum heat generation, if the cumulative heat generation exceeds the preset maximum heat generation, judging the line test cycle result as failure, otherwise, re-timing the power supply time of the power supply line, when the power supply time reaches the first preset time again, re-obtaining the residual resistance value, the cumulative heat generation and the residual resistance difference of the power supply line, judging the line test result based on the re-obtained residual resistance value, judging the line test cycle result based on the re-obtained cumulative heat generation, and judging the degree of damage to the power supply line based on the number of line tests and the re-obtained residual resistance difference.

[0014] In some technical schemes of the present invention, optionally, the degree of damage to the power supply line is judged based on the number of line tests and the residual resistance difference, including: cutting off power to the power supply line for a second preset time period, judging whether the number of line tests is greater than or equal to a first preset threshold value; if the number of line tests is greater than or equal to the first preset threshold value, judging that the degree of damage to the power supply line is permanent damage, locking the power supply line, and initializing the number of fuse failures; otherwise, judging the degree of damage to the power supply line based on the number of fuse failures and the residual resistance difference.

[0015] In some technical schemes of the present invention, optionally, based on the number of fuse failures and the residual resistance difference, the degree of damage to the power supply line is judged, including: judging whether the residual resistance difference is less than a preset difference, if the residual resistance difference is less than the preset difference, incrementing the number of fuse failures, judging the degree of damage to the power supply line based on the number of fuse failures, judging whether the number of fuse failures is greater than or equal to a second preset threshold, if the number of fuse failures is greater than or equal to the second preset threshold, judging that the degree of damage to the power supply line is permanent damage, locking the power supply line, initializing the number of fuse failures and the number of line tests, if the number of fuse failures is less than the second preset threshold, performing a line test on the power supply line again, if the residual resistance difference is greater than or equal to the preset difference, judging whether the number of fuse failures is greater than or equal to the second preset threshold, if the number of fuse failures is greater than or equal to the second preset threshold, judging that the degree of damage to the power supply line is permanent damage, locking the power supply line, initializing the number of fuse failures and the number of line tests, otherwise, performing a line test on the power supply line again.

[0016] A second aspect of the present invention provides a computer-readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, a line testing method for a subway power supply system as in any of the above technical solutions is implemented.

[0017] The present invention provides a line testing method for a subway power supply system, which can shorten the line testing time, improve the testing efficiency and the reliability of the power supply line, and can more accurately identify the fault type of the power supply line.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a flow chart of a line testing method for a subway power supply system according to an embodiment of the present invention; Figure 2 FIG. 4 is a schematic diagram of a line test principle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0022] Refer to the following Figure 1 to Figure 2 A line testing method for a subway power supply system according to some embodiments of the present invention is described.

[0023] like Figure 1 to Figure 2 As shown, the first aspect of the present invention provides a line testing method for a subway power supply system, comprising: Step 102, based on the detection conditions of the line test, initializing the power supply line of the power supply system; Step 104, performing a line test on the power supply line after the initialization process to obtain the residual resistance value, accumulated heat value, residual resistance difference and line test times of the power supply line; Step 106, judging the circuit test result based on the residual resistance value; Step 108, judging the circuit test cycle result based on the accumulated heat value; Step 110, judging the damage degree of the power supply line based on the number of line tests and the residual resistance difference; Step 112: determine the fault type of the power supply line based on the line test result, the line test cycle result and the damage degree of the power supply line.

[0024] The present invention proposes a line test method for a subway power supply system. First, the power supply line of the power supply system that needs to be tested is initialized based on the detection conditions of the line test, and the power supply line after the initialization process is tested to obtain the residual resistance value, cumulative heat value, residual resistance difference and line test times of the power supply line. Among them, the residual resistance value is the resistance value existing on the current power supply line, the cumulative heat value is the heat value of the power supply line since the line test, the line test times is the number of line tests performed on the same power supply line, and the residual resistance difference is the difference between the residual resistance value at the beginning of the line test and the residual resistance value at the end of the line test.

[0025] Then, the power supply line is analyzed step by step according to the above-mentioned parameters related to the power supply line. The line test result is judged based on the residual resistance value, the line test cycle result is judged based on the accumulated heat, and the degree of damage of the power supply line is judged based on the number of line tests and the residual resistance difference.

[0026] Finally, the fault type of the power supply line is determined based on the line test results, the line test cycle results and the degree of damage to the power supply line.

[0027] The line testing method for a subway power supply system proposed in the present invention can shorten the line testing time, improve the testing efficiency and reliability of the power supply line, and more accurately identify the fault type and degree of the power supply line.

[0028] Furthermore, in some embodiments of the present invention, the power supply line of the power supply system is initialized based on the detection conditions of the line test, including: detecting whether the power supply line is permanently locked; if the power supply line is not permanently locked, determining whether the power supply line meets the start conditions of the line test; if the power supply line meets the start conditions of the line test, the initialization process of the power supply line is terminated.

[0029] In this embodiment, before performing a line test on the power supply line, it is first necessary to determine whether the line meets the detection conditions of the line test.

[0030] First, check whether the power supply line is permanently locked. If the power supply line is not permanently locked, further determine whether the power supply line meets the start conditions of the line test. If the power supply line meets the start conditions of the line test, the initialization process of the power supply line is completed.

[0031] By detecting whether the power supply line is permanently locked, the current status of the line can be accurately determined, avoiding testing of lines that cannot be restored, helping to reduce misjudgments and missed judgments during the test process and improving the accuracy and reliability of the test.

[0032] Further, in some embodiments of the present invention, it is determined whether the power supply line meets the starting conditions of the line test. If the power supply line meets the starting conditions of the line test, the initialization processing of the power supply line is completed, including: determining whether the power supply switch is disconnected. If the power supply switch is disconnected, verifying whether the line test function is put into use. If the line test function is put into use, it is determined that the power supply line meets the starting conditions of the line test, and the initialization processing of the power supply line is completed; wherein, the power supply switch is used to control the on and off of the power supply for the protection action tripping.

[0033] In this embodiment, it is first determined whether a power switch for controlling the on and off of power supply for the protection action tripping is disconnected. If the power switch is disconnected, it means that power is no longer supplied to the protection action tripping.

[0034] It should be noted that the line test function is a detection mechanism for the DC feeder switch (or related power supply line) before closing in the subway power supply system. This mechanism determines whether there is a short circuit or other fault in the line by measuring the voltage, resistance and other parameters of the line, thereby ensuring the safe and stable operation of the power supply system.

[0035] On this basis, after confirming that the power switch is disconnected, verify whether the line test function is put into use. If the line test function is put into use, it is determined that the power supply line meets the start conditions of the line test, and the initialization process of the power supply line is completed.

[0036] By judging whether the power supply line meets the start conditions of the line test, the test work can be ensured to proceed in an orderly manner. This avoids the test failure or repeated test caused by unsatisfied conditions during the test process, and improves the test efficiency.

[0037] Furthermore, in some embodiments of the present invention, a line test is performed on the power supply line after initialization processing to obtain the residual resistance value, cumulative heat generation, residual resistance difference and line test times of the power supply line, including: performing incremental processing on the line test times, connecting a line test resistor in the power supply line, and supplying power to the power supply line; when the power supply time of the power supply line reaches a first preset time, obtaining the voltage value and the current value, and obtaining the residual resistance value based on the voltage value and the current value; obtaining the cumulative heat generation based on the historical heat generation, the voltage value and the current value; obtaining the residual resistance difference based on the residual resistance value before the power supply line is powered on and the residual resistance value after the power supply line is powered on; wherein, the line test resistor is connected in parallel with the power switch.

[0038] In this embodiment, if Figure 2 As shown, the number of line tests is first incremented, and then the number of complete line test cycles is recorded.

[0039] Then, a line test resistor is connected to the power supply line to supply power to the power supply line. When the power supply line is tested, because the control switch is disconnected and the line test resistor is connected in parallel with the control switch, the current will pass through the line test resistor to form a complete loop. And when the power supply time of the power supply line reaches the first preset time, the voltage value of the power supply line and the current value of the line test circuit are obtained, and the remaining resistance value is obtained based on the voltage value and the current value, so as to understand the resistance value existing on the current power supply line.

[0040] Specifically, the calculation formula of the residual resistance value is as follows: ; in, is the residual resistance value, is the voltage value, is the resistance value.

[0041] Furthermore, the current heating value of the power supply line can be obtained based on the voltage value and the current value, and the accumulated heating value can be obtained based on the historical heating value.

[0042] Specifically, the calculation formula for the cumulative heat output is as follows: ;in, is the cumulative heat output, It should be noted that if a power supply line is subjected to a line test, the accumulated heat generated by the power supply line during the previous line test is the historical heat generated by the power supply line during the current line test.

[0043] Based on the residual resistance value before powering the power supply line and the residual resistance value after powering the power supply line, a residual resistance difference is obtained to determine whether the residual resistance value changes.

[0044] By obtaining the residual resistance value, cumulative heat generation, residual resistance difference and number of line tests of the power supply line, further judgment can be made on the situation of the line test.

[0045] Further, in some embodiments of the present invention, the line test result is judged based on the residual resistance value, including: judging whether the residual resistance value is greater than a preset resistance value; if the residual resistance value is greater than the preset resistance value, judging that the line test result is successful, resetting the number of line tests; otherwise, re-timing the power supply time of the power supply line; when the power supply time reaches the first preset time again, re-obtaining the residual resistance value, the cumulative heat generation and the residual resistance difference of the power supply line; judging the line test result based on the re-obtained residual resistance value; judging the line test cycle result based on the re-obtained cumulative heat generation; judging the degree of damage to the power supply line based on the number of line tests and the re-obtained residual resistance difference.

[0046] In this embodiment, it is determined whether the remaining resistance value is greater than the preset resistance value. If the remaining resistance value is greater than the preset resistance value, the line test result is determined to be successful, the line test times are reset, and the line test process ends.

[0047] Otherwise, the residual resistance value is time-stamped, so that when the residual resistance difference value is subsequently acquired again, the correct residual resistance value is used for calculation, thereby improving the accuracy of the test.

[0048] Furthermore, in some embodiments of the present invention, the result of the line test cycle is judged based on the cumulative heat generation, including: judging whether the cumulative heat generation exceeds the preset maximum heat generation; if the cumulative heat generation exceeds the preset maximum heat generation, judging that the result of the line test cycle is a failure; otherwise, supplying power to the power supply line for the first preset time, and re-obtaining the remaining resistance value, the cumulative heat generation and the remaining resistance difference of the power supply line.

[0049] In this embodiment, after determining the line test result, the line test cycle condition is further determined. First, it is determined whether the accumulated heat value exceeds the preset maximum heat value. If the accumulated heat value exceeds the preset maximum heat value, the line test cycle result is determined to be a failure. Otherwise, in order to avoid errors when the data is just obtained, the power supply time of the power supply line is re-timed. When the power supply time reaches the first preset time again, the remaining resistance value, the accumulated heat value and the remaining resistance difference of the power supply line are re-obtained, and then the line test situation is re-judged based on the re-obtained remaining resistance value, the re-obtained accumulated heat value and the re-obtained remaining resistance difference, thereby improving the reliability of the line test.

[0050] Specifically, the calculation formula for the preset maximum heat output is as follows: .in, The preset maximum heat value.

[0051] Furthermore, in some embodiments of the present invention, the degree of damage to the power supply line is determined based on the number of line tests and the residual resistance difference, including: cutting off power to the power supply line for a second preset time period, determining whether the number of line tests is greater than or equal to a first preset threshold; if the number of line tests is greater than or equal to the first preset threshold, determining that the degree of damage to the power supply line is permanent damage, locking the power supply line, and initializing the number of fuse failures; otherwise, determining the degree of damage to the power supply line based on the number of fuse failures and the residual resistance difference.

[0052] In this embodiment, the power supply line is disconnected for a second preset time period, thereby cooling the faulty foreign object and attempting to deform the foreign object by utilizing thermal expansion and contraction.

[0053] At the same time, it is determined whether the number of line tests is greater than or equal to a first preset threshold. If the number of line tests is greater than or equal to the first preset threshold, it is determined that the damage degree of the power supply line is permanent damage, that is, the fault or problem is permanent, not temporary or intermittent. In this case, the power supply line is further locked and the number of fuse failures is initialized.

[0054] Otherwise, it means that it is still impossible to determine whether the damage to the power supply line is permanent. For further confirmation, the damage to the power supply line is determined based on the number of fuse failures and the residual resistance difference, thereby improving the reliability of the line test.

[0055] Further, in some embodiments of the present invention, the degree of damage to the power supply line is judged based on the number of fuse failures and the residual resistance difference, including: judging whether the residual resistance difference is less than a preset difference, if the residual resistance difference is less than the preset difference, incrementing the number of fuse failures, judging the degree of damage to the power supply line based on the number of fuse failures, judging whether the number of fuse failures is greater than or equal to a second preset threshold, if the number of fuse failures is greater than or equal to the second preset threshold, judging that the degree of damage to the power supply line is permanent damage, locking the power supply line, initializing the number of fuse failures and the number of line tests, if the number of fuse failures is less than the second preset threshold, performing line tests on the power supply line again, if the residual resistance difference is greater than or equal to the preset difference, judging whether the number of fuse failures is greater than or equal to the second preset threshold, if the number of fuse failures is greater than or equal to the second preset threshold, judging that the degree of damage to the power supply line is permanent damage, locking the power supply line, initializing the number of fuse failures and the number of line tests.

[0056] In this embodiment, because it is not possible to determine whether the damage to the power supply line is permanent, it is determined whether the residual resistance difference is less than the preset difference to determine whether the residual resistance value has changed. Under normal circumstances, when a large current passes through a foreign object, heat will cause the resistance to increase. If the residual resistance difference is less than the preset difference, it means that the resistance has hardly changed, indicating that the foreign object is too large, and this fuse attempt has failed, and the number of fuse failures is incremented.

[0057] Then, the number of fuse failures is further judged, and the degree of damage to the power supply line is judged based on the number of fuse failures, and whether the number of fuse failures is greater than or equal to a second preset threshold value is judged. If the number of fuse failures is greater than or equal to the second preset threshold value, the degree of damage to the power supply line is judged to be permanent damage, the power supply line is locked, and the number of fuse failures and the number of line tests are initialized. If the number of fuse failures is less than the second preset threshold value, the power supply line is tested again.

[0058] At the same time, if the remaining resistance difference is greater than or equal to the preset difference, it means that the current fuse attempt is successful, and it is directly determined whether the number of fuse failures is greater than or equal to the second preset threshold. If the number of fuse failures is greater than or equal to the second preset threshold, it is determined that the degree of damage to the power supply line is permanent damage, the power supply line is locked, and the number of fuse failures and the number of line tests are initialized. Otherwise, the power supply line is tested again.

[0059] In one specific embodiment, the line testing method for a subway power supply system of the present invention is as follows: Before performing a line test on a power supply line, it is first necessary to determine whether the line meets the detection conditions of the line test.

[0060] First, check whether the power supply line is permanently locked. If the power supply line is not permanently locked, further determine whether the power supply switch used to control the on and off of the power supply for the protection action tripping is disconnected. If the power supply switch is disconnected, it means that the protection action tripping is no longer powered.

[0061] It should be noted that the line test function is a detection mechanism for the DC feeder switch (or related power supply line) before closing in the subway power supply system. This mechanism determines whether there is a short circuit or other fault in the line by measuring the voltage, resistance and other parameters of the line, thereby ensuring the safe and stable operation of the power supply system.

[0062] On this basis, after confirming that the power switch is disconnected, verify whether the line test function is put into use. If the line test function is put into use, it is determined that the power supply line meets the start conditions of the line test, and the initialization process of the power supply line is completed.

[0063] Then, the number of line tests is incremented to record the number of complete line test cycles.

[0064] Then, a line test resistor is connected to the power supply line to supply power to the power supply line. When the power supply line is tested, because the control switch is disconnected and the line test resistor is connected in parallel with the control switch, the current will pass through the line test resistor to form a complete loop. When the power supply time of the power supply line reaches the first preset time, the voltage value of the power supply line and the current value of the line test circuit are obtained, and the residual resistance value is obtained according to the voltage value and the current value, so as to understand the resistance value existing on the current power supply line. In addition, the current heat generation of the power supply line can be obtained according to the voltage value and the current value, and the cumulative heat generation is obtained according to the historical heat generation. Based on the residual resistance value before the power supply line is powered on and the residual resistance value after the power supply line is powered on, the residual resistance difference is obtained to determine whether the residual resistance value has changed.

[0065] Then, it is determined whether the residual resistance value is greater than the preset resistance value. If the residual resistance value is greater than the preset resistance value, the line test result is determined to be successful, the line test times are reset, and the line test process ends. Otherwise, the residual resistance value is time-stamped, so that when the residual resistance difference is re-obtained later, the correct residual resistance value is used for calculation.

[0066] After judging the line test result, further judge the line test cycle situation, first judge whether the cumulative heat generation exceeds the preset maximum heat generation, if the cumulative heat generation exceeds the preset maximum heat generation, judge the line test cycle result as failure, otherwise, in order to avoid errors when just obtaining the data, re-time the power supply time of the power supply line, when the power supply time reaches the first preset time again, re-obtain the residual resistance value, the cumulative heat generation and the residual resistance difference of the power supply line, and then re-judge the line test situation based on the re-obtained residual resistance value, the re-obtained cumulative heat generation and the re-obtained residual resistance difference.

[0067] The power supply line is disconnected for a second preset time period, thereby cooling the faulty foreign object and attempting to deform the foreign object by utilizing thermal expansion and contraction.

[0068] At the same time, it is determined whether the number of line tests is greater than or equal to a first preset threshold. If the number of line tests is greater than or equal to the first preset threshold, it is determined that the damage degree of the power supply line is permanent damage, that is, the fault or problem is permanent, not temporary or intermittent. In this case, the power supply line is further locked and the number of fuse failures is initialized.

[0069] Otherwise, it means that it is not possible to determine whether the damage to the power supply line is permanent. Because it is not possible to determine whether the damage to the power supply line is permanent, it is determined whether the residual resistance difference is less than the preset difference to determine whether the residual resistance value has changed. Under normal circumstances, when a large current passes through a foreign object, heat will cause the resistance to increase. If the residual resistance difference is less than the preset difference, it means that the resistance has hardly changed, indicating that the foreign object is too large, and this fuse attempt has failed, and the number of fuse failures is incremented.

[0070] Then, the number of fuse failures is further judged, and the degree of damage to the power supply line is judged based on the number of fuse failures, and whether the number of fuse failures is greater than or equal to a second preset threshold value is judged. If the number of fuse failures is greater than or equal to the second preset threshold value, the degree of damage to the power supply line is judged to be permanent damage, the power supply line is locked, and the number of fuse failures and the number of line tests are initialized. If the number of fuse failures is less than the second preset threshold value, the power supply line is tested again.

[0071] At the same time, if the remaining resistance difference is greater than or equal to the preset difference, it means that the current fuse attempt is successful, and it is directly determined whether the number of fuse failures is greater than or equal to the second preset threshold. If the number of fuse failures is greater than or equal to the second preset threshold, it is determined that the degree of damage to the power supply line is permanent damage, the power supply line is locked, and the number of fuse failures and the number of line tests are initialized. Otherwise, the power supply line is tested again.

[0072] The second aspect of the present invention provides a computer-readable storage medium, on which programs or instructions are stored. When the program or instructions are executed by a processor, a line testing method for a power supply system as in any of the above-mentioned embodiments is implemented, thereby having all the beneficial technical effects of the line testing method for a power supply system in any of the above-mentioned embodiments.

[0073] The computer readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0074] A computer-readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device, and may be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above devices, but is not limited thereto. A non-exhaustive list of more specific examples of computer-readable storage media includes: portable computer floppy disks, hard disks, random access memories, read-only memories, erasable programmable read-only memories, static random access memories, portable compact disk read-only memories, digital versatile disks, memory cards, floppy disks, encoding mechanical devices (such as punched cards or grooves with raised structures having instructions recorded therein), and any suitable combination of the above devices. The computer-readable storage medium used herein should not be understood as a transmission signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media, or electrical signals transmitted through wires, etc.

[0075] In the claims, specification and drawings of the present invention, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, which is only for the purpose of more conveniently describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limiting the present invention; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0076] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A line testing method for a subway power supply system, characterized in that: include: Based on the detection conditions of the line test, the power supply line of the power supply system is initialized; Performing a line test on the power supply line after the initialization process to obtain a residual resistance value, a cumulative heat value, a residual resistance difference value, and a number of line tests of the power supply line; Based on the residual resistance value, determining a circuit test result; Based on the accumulated heat generation, determining a circuit test cycle result; Based on the number of line tests and the residual resistance difference, determining the degree of damage to the power supply line; Based on the line test result, the line test cycle result and the damage degree of the power supply line, the fault type of the power supply line is determined.

2. The line testing method for a subway power supply system according to claim 1, characterized in that: The initialization process of the power supply line of the power supply system based on the detection condition of the line test includes: Detect whether the power supply line is permanently locked. If the power supply line is not permanently locked, determine whether the power supply line meets the start conditions of the line test. If the power supply line meets the start conditions of the line test, the initialization process of the power supply line is completed.

3. The line testing method for a subway power supply system according to claim 2, characterized in that: The determining whether the power supply line meets the starting condition of the line test, if the power supply line meets the starting condition of the line test, the initialization process of the power supply line is finished, including: Determine whether the power switch is disconnected, if the power switch is disconnected, verify whether the line test function is put into use, if the line test function is put into use, determine whether the power supply line meets the start condition of the line test, and end the initialization process of the power supply line; Among them, the power supply switch is used to control the on and off of the power supply for the protection action tripping.

4. The line testing method for a subway power supply system according to claim 3, characterized in that: The performing of a line test on the power supply line after the initialization process to obtain a residual resistance value, a cumulative heat value, a residual resistance difference value and a line test number of the power supply line includes: Performing an increment process on the number of line tests, connecting the line test resistor to the power supply line, and supplying power to the power supply line; When the power supply duration of the power supply line reaches a first preset duration, obtaining a voltage value of the power supply line and a current value of a line test circuit, and obtaining the residual resistance value based on the voltage value and the current value; Based on the historical heating value, the voltage value and the current value, obtaining the cumulative heating value; Obtaining a residual resistance difference based on a residual resistance value before power is supplied to the power supply line and a residual resistance value after power is supplied to the power supply line; Wherein, the line test resistor is connected in parallel with the power switch.

5. The line testing method for a subway power supply system according to claim 1, characterized in that: The determining of the circuit test result based on the residual resistance value includes: Determine whether the remaining resistance value is greater than a preset resistance value. If the remaining resistance value is greater than the preset resistance value, determine that the line test result is successful, and reset the line test times. Otherwise, the remaining resistance value is time-stamped.

6. The line testing method for a subway power supply system according to claim 4, characterized in that: The determining of the circuit test cycle result based on the accumulated heat generation includes: Determine whether the accumulated heat value exceeds a preset maximum heat value, and if the accumulated heat value exceeds the preset maximum heat value, determine that the line test cycle result is a failure, Otherwise, the power supply time of the power supply line is re-timed, and when the power supply time reaches the first preset time again, the residual resistance value, the cumulative heat value and the residual resistance difference of the power supply line are re-obtained, and the line test result is judged based on the re-obtained residual resistance value, and the line test cycle result is judged based on the re-obtained cumulative heat value, and the degree of damage of the power supply line is judged based on the number of line tests and the re-obtained residual resistance difference.

7. The line testing method for a subway power supply system according to claim 1, characterized in that: The determining the degree of damage of the power supply line based on the number of line tests and the residual resistance difference includes: The power supply line is powered off for a second preset time, and it is determined whether the number of line tests is greater than or equal to a first preset threshold. If the number of line tests is greater than or equal to the first preset threshold, it is determined that the damage to the power supply line is permanent damage, the power supply line is locked, and the number of fuse failures is initialized. Otherwise, the damage degree of the power supply line is determined based on the number of fuse failures and the residual resistance difference.

8. The line testing method for a subway power supply system according to claim 7, characterized in that: The determining the degree of damage to the power supply line based on the number of fuse failures and the residual resistance difference includes: Determine whether the residual resistance difference is less than a preset difference. If the residual resistance difference is less than the preset difference, increment the number of fuse failures. Determine the degree of damage to the power supply line based on the number of fuse failures. Determine whether the number of fuse failures is greater than or equal to a second preset threshold. If the number of fuse failures is greater than or equal to the second preset threshold, determine that the degree of damage to the power supply line is permanent damage. The power supply line is locked. Initialize the number of fuse failures and the number of line tests. If the number of fuse failures is less than the second preset threshold, perform a line test on the power supply line again. If the residual resistance difference is greater than or equal to the preset difference, determine whether the number of fuse failures is greater than or equal to the second preset threshold. If the number of fuse failures is greater than or equal to the second preset threshold, determine that the damage to the power supply line is permanent damage, lock the power supply line, initialize the number of fuse failures and the number of line tests, otherwise, perform a line test on the power supply line again.

9. A computer-readable storage medium storing a program or instruction, characterized in that: When the program or the instruction is executed by a processor, the line testing method for a subway power supply system according to any one of claims 1 to 8 is implemented.

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