Monitoring device, method and equipment for subway traction return cable
By designing a monitoring device on the subway traction return cable to identify abnormal conditions of the cable and return current, the problem of unstable operation of the subway traction return cable is solved, and the safe and stable operation of the subway traction power supply system is achieved.
Patent Information
- Application Number
- CN202510098875.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-06-06
AI Technical Summary
The subway traction return cable is prone to abnormalities during operation, resulting in unstable return current and affecting the safe and stable operation of the subway.
A monitoring device is designed, including a cable determination module, a signal acquisition module and an abnormality identification module, which is used to determine the target return cable in each return cable, obtain its current signal and convert it into a digital signal, identify whether there is an abnormality, and generate abnormal prompt information when an abnormality is identified.
By promptly discovering abnormal conditions of the subway traction return cable, the safe and stable operation of the subway traction power supply system can be ensured and safety accidents caused by cable failure can be avoided.
Smart Images
Figure CN120103048A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of electric power facilities, and specifically relates to a monitoring device, method and equipment for subway traction return cables. Background Art
[0002] The subway traction return cable plays an indispensable role in the subway power supply system. When the subway train is running, the motor will generate corresponding return current while driving the subway train forward. These return currents first use the rails as conductors and then return to the traction substation through the subway traction return cable. It can be seen that whether the subway traction return cable can maintain the stability of the return current is directly related to the reliability and safety of subway operation.
[0003] However, in the actual operation of the subway, many factors threaten the stability of the return current. For example, the aging of the return cable due to long-term use, the interference caused by the complex electromagnetic environment, and the current shock caused by the frequent start and stop of subway trains may cause abnormal return current, thus affecting the safe and stable operation of the subway. Therefore, how to monitor the status of the subway traction return cable and return current in real time so that it can be maintained in time when an abnormality occurs is an urgent problem that people in this field need to solve. Summary of the invention
[0004] The embodiments of the present application provide a monitoring device, method and equipment for a subway traction return cable, the purpose of which is to help timely discover abnormal conditions of the subway traction return cable during operation, thereby ensuring the safe and stable operation of the subway traction power supply system.
[0005] In a first aspect, an embodiment of the present application provides a monitoring device for a subway traction return cable, the device comprising:
[0006] A cable determination module, used for determining a target return cable among the return cables;
[0007] A signal acquisition module, used for acquiring a current signal on the target return cable and converting the current signal into a digital signal;
[0008] The abnormality identification module is used to identify whether the current signal and / or the target return cable has an abnormality according to the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists.
[0009] In a second aspect, an embodiment of the present application provides a method for monitoring a subway traction return cable, the method comprising:
[0010] Determine a target return cable among the return cables by a cable determination module;
[0011] Acquire the current signal on the target return cable through a signal acquisition module, and convert the current signal into a digital signal;
[0012] The abnormality identification module identifies whether the current signal and / or the target return cable has abnormality according to the digital signal, and generates corresponding abnormality prompt information when it is identified that the abnormality exists.
[0013] In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect.
[0014] In an embodiment of the present application, a cable determination module is used to determine a target return cable among the return cables; a signal acquisition module is used to acquire a current signal on the target return cable and convert the current signal into a digital signal; an abnormality identification module is used to identify whether the current signal and / or the target return cable has an abnormality based on the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists. The above-mentioned monitoring device for the subway traction return cable can help to promptly detect abnormal conditions of the subway traction return cable during operation, thereby ensuring the safe and stable operation of the subway traction power supply system, by identifying whether the current signal and / or the target return cable has an abnormality based on the digital signal of the target return cable, and generating corresponding abnormality prompt information when it is identified that an abnormality exists. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of a monitoring device for a subway traction return cable provided in Example 1 of the present application;
[0016] Figure 2 It is a structural schematic diagram of a monitoring device for a subway traction return cable provided in Example 2 of the present application;
[0017] Figure 3 It is a structural schematic diagram of a monitoring device for a subway traction return cable provided in Example 3 of the present application;
[0018] Figure 4 It is a flow chart of a method for monitoring a subway traction return cable provided in Embodiment 4 of the present application;
[0019] Figure 5 It is a schematic diagram of the structure of an electronic device provided in Example 5 of the present application. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for the convenience of description, only the part related to the present application but not all the contents are shown in the accompanying drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow chart describes each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. The process can be terminated when its operation is completed, but it can also have additional steps not included in the accompanying drawings. The process can correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
[0021] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.
[0022] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0023] In the following, in conjunction with the accompanying drawings, the monitoring device, method and equipment for the subway traction return cable provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.
[0024] Embodiment 1
[0025] Figure 1 Schematic diagram of the structure of the monitoring device for subway traction return cable provided in the first embodiment of the present application. Figure 1 As shown, the device comprises:
[0026] The cable determination module 110 is used to determine a target return cable among the return cables;
[0027] A signal acquisition module 120, used to acquire a current signal on the target return cable and convert the current signal into a digital signal;
[0028] The abnormality identification module 130 is used to identify whether the current signal and / or the target return cable has an abnormality according to the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists.
[0029] This application is applicable to the scenario where the subway is equipped with a subway traction return cable. Specifically, the determination of the target return cable, the conversion of digital signals, and the identification and prompting of abnormalities can be performed by the intelligent terminal device. According to the generated abnormal prompt information, the staff can promptly maintain the target return cable with abnormalities to ensure the normal and safe operation of the subway.
[0030] Based on the above usage scenarios, it can be understood that the executor of the present application can be a smart terminal device, such as a desktop computer, a laptop computer, a mobile phone, a tablet computer, and interactive multimedia, etc., and no excessive limitations are made here.
[0031] The cable determination module 110 is used to determine a target return cable among the return cables.
[0032] Cable is a device used to transmit power or signals. Return cable can be a cable used to send the return current generated by the subway train back to the traction substation. Among them, return current refers to the current returning from the load end to the power supply end in the circuit; in the subway traction power supply system, the subway train obtains electric energy from the contact network through the pantograph. While the electric energy drives the subway train to run, there will be a corresponding current flowing out of the subway train, through the running rails, the earth and other media, and finally return to the traction substation through the return cable. This part of the current is the return current.
[0033] The target return cable is the return cable that needs to be monitored. The target return cable can be determined among the return cables by obtaining historical subway operation data, determining the average value of the carrying current data of each return cable in a key stage according to the historical subway operation data, determining the return cable whose average value exceeds a preset average current threshold as the target return cable, and determining the return cable connected to the subway safety system as the target return cable.
[0034] The signal acquisition module 120 is used to acquire the current signal on the target return cable and convert the current signal into a digital signal.
[0035] The current signal can be an electrical signal that indicates the change of the current size, direction and other characteristics of the target return cable over time. From a microscopic perspective, the free charges in the conductor (such as free electrons in a metal conductor) move in a directional manner under the action of the electric field force, and these directional moving charges form a current. The current signal can be collected by a current transformer.
[0036] A digital signal can be a discrete sequence of digital values used to represent the characteristics of a current signal. Compared to current signals, digital signals are easier to store, transmit, and process and analyze by computers, and can more accurately extract various information related to current. The current signal can be converted into a digital signal by sampling, quantizing, and encoding the current signal to obtain a digital signal.
[0037] In this technical solution, optionally, the signal acquisition module is specifically used to:
[0038] Acquiring current signals at at least two locations on the target return cable;
[0039] Converting the current signal into a digital signal and performing time alignment on the digital signal;
[0040] and / or,
[0041] Acquiring a current signal on the target return cable by using at least two types of sensors;
[0042] The current signal is converted into a digital signal, and the digital signal is normalized.
[0043] The method of obtaining the current signal at at least two positions on the target return cable can be to collect the current signal through a current transformer set at at least two positions on the target return cable. Among them, the setting position of the current transformer can include a position on the target return cable close to the subway train access point and a position close to the traction substation. The method of time alignment of digital signals can be to calculate the correlation of digital signals at each position under different time delays through a cross-correlation algorithm, find the time delay amount corresponding to the maximum correlation, and perform corresponding time shifts on other digital signals according to the time delay amount to achieve time alignment of digital signals. After time alignment, the average value of digital signals at different positions at the same time point is calculated as the digital signal finally adopted at that time point.
[0044] Different types of sensors may have different acquisition principles and acquisition ranges, but they are all sensors that can be used to collect current signals. Different types of sensors may include current transformers, Hall current sensors, and magnetoresistive sensors. The digital signal can be normalized by mapping the digital signals corresponding to different types of sensors to a standard numerical range. After normalization, the average value of the digital signals corresponding to different types of sensors at the same time point is calculated as the final digital signal used at that time point.
[0045] The benefit of such a configuration of the present scheme is that by acquiring current signals at at least two positions on the target return cable, converting the current signals into digital signals and time-aligning the digital signals, and / or acquiring current signals on the target return cable through at least two types of sensors, converting the current signals into digital signals and normalizing the digital signals, the return current characteristics can be more comprehensively and accurately reflected, and the errors and limitations caused by a single signal acquisition position or a single sensor type can be effectively reduced, providing a more accurate and reliable data basis for subsequent abnormality identification based on these digital signals, thereby improving the monitoring accuracy of subway traction return cables.
[0046] The abnormality identification module 130 is used to identify whether the current signal and / or the target return cable has an abnormality according to the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists.
[0047] The abnormality may refer to the situation that the state and parameters of the current signal and / or the target return cable deviate from the range or mode that should be in normal operation. The method of identifying whether the current signal and / or the target return cable are abnormal according to the digital signal may be to determine at least one subway operation stage and current waveform data corresponding to the subway operation stage according to the digital signal, and identify whether the current signal and / or the target return cable are abnormal according to the subway operation stage and the corresponding current waveform data.
[0048] The abnormal prompt information can be used to remind the staff that the current signal and / or the target return cable are abnormal and need to be maintained in time. The specific content of the abnormal prompt information may include the identification information of the target return cable with the abnormality and the digital signal of the target return cable. The corresponding abnormal prompt information can be generated by controlling the display device of the intelligent terminal device to pop up a prompt window, and the specific content of the abnormal prompt information is displayed in the prompt window.
[0049] In the example of the present application, the cable determination module is used to determine the target return cable among the return cables; the signal acquisition module is used to obtain the current signal on the target return cable and convert the current signal into a digital signal; the abnormality identification module is used to identify whether the current signal and / or the target return cable has an abnormality based on the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists. This technical solution can help to timely discover abnormal conditions of the subway traction return cable during operation, thereby ensuring the safe and stable operation of the subway traction power supply system, by identifying whether the current signal and / or the target return cable has an abnormality based on the digital signal of the target return cable, and generating corresponding abnormality prompt information when it is identified that an abnormality exists.
[0050] Embodiment 2
[0051] Figure 2 It is a structural schematic diagram of the monitoring device for subway traction return cables provided in Example 2 of the present application. This solution has made better improvements on the basis of the above-mentioned embodiments, and the specific improvements are as follows: the cable determination module is specifically used to: obtain historical subway operation data; determine the average value of the carrying current data of each return cable in the key stage according to the historical subway operation data; wherein the key stage includes at least one of the traction stage, the idling stage and the braking stage; determine the return cable whose average value exceeds the preset average current threshold as the target return cable.
[0052] like Figure 2 As shown, the device comprises:
[0053] A cable determination module 210, configured to determine a target return cable among the return cables;
[0054] A signal acquisition module 220, used to acquire a current signal on the target return cable and convert the current signal into a digital signal;
[0055] The abnormality identification module 230 is used to identify whether the current signal and / or the target return cable has an abnormality according to the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists.
[0056] The cable determination module 210 is specifically used for:
[0057] Obtain historical subway operation data;
[0058] Determine the average value of the carrying current data of each return cable in a key stage according to the historical operation data of the subway; wherein the key stage includes at least one of a traction stage, a coasting stage, and a braking stage;
[0059] The return cable whose average value exceeds a preset average current threshold is determined as a target return cable.
[0060] Subway historical operation data may refer to various data generated and recorded during the operation of the subway system before the current time point. These data cover many aspects of subway operation, including but not limited to the operation status of subway trains, the operation parameters of equipment, and the information of passengers getting on and off the train. In this solution, subway historical operation data mainly involves the operation phase of subway trains and the carrying current data of return cables. Subway historical operation data is generally collected by various monitoring systems, sensors, and data recording devices of the subway. After collection, it can be stored in an associated manner. The subway historical operation data can be obtained by searching the associated stored data.
[0061] The key stage may refer to the representative and decisive operation stage of the subway train, which may include the traction stage, the coasting stage and the braking stage. The carrying current data may refer to the current carried by the return cable at each moment. Specifically, the traction stage may refer to the process of the subway train accelerating from a stationary state to a set speed. At this stage, the subway train needs a large amount of electric energy to drive the motor, and the carrying current of the return cable is large to provide the power required for the train to accelerate; the coasting stage may refer to the stage in which the subway train turns off the traction motor after reaching a certain speed and continues to run by inertia. At this time, the subway train consumes relatively less electric energy, and the carrying current in the return cable is also reduced accordingly; the braking stage may refer to the stage in which the subway train implements the braking operation in order to slow down or stop. During the braking process, the kinetic energy of the subway train will be converted into electric energy or heat energy through the braking device, and the carrying current in the return cable will vary depending on the braking method.
[0062] The method for determining the average value of the carrying current data of each return cable in the critical stage according to the historical operation data of the subway can be adopted. The time range in which the subway train is in each critical stage can be determined according to the historical operation data of the subway, and the carrying current data of a return cable in each time range is added and divided by the total duration of each time range to obtain the average value of the carrying current data of the return cable in the critical stage.
[0063] The preset average current threshold may be a preset lower limit of the average value of the carrying current data indicating that the power supply line to which the return cable is connected is a key line for ensuring the operation of core equipment of the subway (eg, traction motor of a subway train, etc.).
[0064] Here is a sample code to identify the target return cable among the return cables:
[0065] #Simulate historical subway operation data
[0066]
[0067]
[0068]
[0069] In this technical solution, optionally, the cable determination module is further used to:
[0070] A return cable connected to a subway safety system is determined as a target return cable; wherein the subway safety system includes at least one of an emergency braking system and a door control system.
[0071] The subway safety system is a general term for a series of systems designed to ensure the safe and reliable operation of the subway and protect the lives and property of passengers. The subway safety system can include emergency braking systems and door control systems. Specifically, the emergency braking system is used to quickly stop the subway train when the subway train faces an emergency, such as obstacles in front, abnormal operation of the subway train, etc., to avoid accidents or reduce the degree of harm caused by accidents. The emergency braking system relies on a variety of sensors to monitor the running status of the train and the surrounding environment. Once the emergency braking conditions are triggered, it will respond quickly and apply sufficient braking force; the door control system is responsible for controlling the opening and closing operations of the subway train doors to ensure that the doors can work correctly and safely at all stages of the subway train operation. The door control system must not only ensure that passengers get on and off the platform normally, but also prevent the doors from accidentally opening during the operation of the train, threatening the safety of passengers.
[0072] The benefit of this scheme is that by identifying the return cables connected to the subway safety system as target return cables, we can focus on the return cables that play a key role in ensuring the safe operation of the subway, help timely discover potential cable failure hazards of these return cables, and avoid failure of the subway safety system caused by return cable failures to the greatest extent, thereby reducing the risk of major safety accidents.
[0073] The benefit of this arrangement of the present scheme is that by determining the average value of the carrying current data of each return cable in a critical stage based on the historical operation data of the subway, and identifying the return cables whose average value exceeds the preset average current threshold as target return cables, the return cables that are critical to the operation of the subway can be accurately identified, which helps the staff to focus on monitoring and maintaining these return cables, thereby improving the monitoring efficiency of the subway traction return cables.
[0074] Embodiment 3
[0075] Figure 3It is a structural diagram of the monitoring device for the subway traction return cable provided in the third embodiment of the present application. This solution has made better improvements on the basis of the above embodiments, and the specific improvements are as follows: the abnormality identification module includes: a stage determination unit, which is used to determine at least one subway operation stage and the current waveform data corresponding to the subway operation stage according to the digital signal; an abnormality identification unit, which is used to identify whether the current signal and / or the target return cable are abnormal according to the subway operation stage and the current waveform data; a prompt generation unit, which is used to generate corresponding abnormality prompt information when it is identified that an abnormality exists.
[0076] like Figure 3 As shown, the device comprises:
[0077] A cable determination module 310, configured to determine a target return cable among the return cables;
[0078] A signal acquisition module 320, used to acquire a current signal on the target return cable and convert the current signal into a digital signal;
[0079] The abnormality identification module 330 is used to identify whether the current signal and / or the target return cable has an abnormality according to the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists.
[0080] The abnormality identification module 330 includes:
[0081] A stage determination unit 3301, configured to determine at least one subway operation stage and current waveform data corresponding to the subway operation stage according to the digital signal;
[0082] An abnormality identification unit 3302 is used to identify whether the current signal and / or the target return cable is abnormal according to the subway operation stage and the current waveform data;
[0083] The prompt generating unit 3303 is used to generate corresponding abnormal prompt information when an abnormality is identified.
[0084] The subway operation stage may refer to different states of the subway train during operation, reflecting different operating conditions of the subway train during operation. The subway operation stage may include the traction stage, the coasting stage, and the braking stage, etc. The current waveform data may refer to the curve-related data of the digital signal changing with time in a graphical or digitized form.
[0085] The method for determining at least one subway operation stage and the current waveform data corresponding to the subway operation stage according to the digital signal can adopt a method of pre-establishing a digital signal feature library for different operation stages, comparing the current digital signal with the data in the digital signal feature library, identifying the operation stage whose matching degree with the current digital signal exceeds a preset matching degree threshold through a pattern recognition algorithm, and extracting the current waveform data corresponding to the operation stage.
[0086] The method for identifying whether there is an abnormality in the current signal and / or the target return cable according to the subway operation stage and the current waveform data can be adopted to determine the normal current fluctuation range, the reference peak position and the reference trough position according to the subway operation stage, and when the current waveform data exceeds the normal current fluctuation range, identify that there is an abnormality in the current signal and / or the target return cable, and / or determine the degree of deviation between the peak position of the current waveform data and the reference peak position and the degree of deviation between the trough position of the current waveform data and the reference trough position, and when the deviation degree exceeds a preset deviation threshold, identify that there is an abnormality in the current signal and / or the target return cable.
[0087] In the technical solution, optionally, the abnormality identification unit is specifically used to:
[0088] Determine the normal current fluctuation range, the reference peak position and the reference trough position according to the subway operation stage;
[0089] When the current waveform data exceeds the normal current fluctuation range, identifying that the current signal and / or the target return cable is abnormal;
[0090] and / or,
[0091] Determine the degree of deviation between the peak position of the current waveform data and the reference peak position and the degree of deviation between the trough position of the current waveform data and the reference trough position, and identify that the current signal and / or the target return cable are abnormal when the degree of deviation exceeds a preset deviation threshold.
[0092] The normal current fluctuation range may refer to the range of normal fluctuations in the current size. The reference peak position may refer to the time point or position where the peak of the current should appear when there is no abnormality; the reference trough position may refer to the time point or position where the trough of the current should appear when there is no abnormality. The method of determining the normal current fluctuation range, reference peak position and reference trough position according to the subway operation stage can be adopted to obtain the subway historical operation data, conduct statistical analysis for each subway operation stage, and obtain the normal current fluctuation range, reference peak position and reference trough position corresponding to each subway operation stage. By querying with the current subway operation stage as the query condition, the normal current fluctuation range, reference peak position and reference trough position corresponding to the current subway operation stage can be determined.
[0093] The current waveform data exceeds the normal current fluctuation range, indicating that the fluctuation of the current size has deviated from the normal value range that should be presented in the operation stage of the subway. This is very likely to imply that there is an abnormality in the power supply during the operation of the subway train, or that the target return cable is disturbed by factors such as overload, short circuit, local damage, etc. when transmitting current, resulting in changes in the current transmission characteristics. Therefore, it can be identified that there is an abnormality in the current signal and / or the target return cable.
[0094] The degree of deviation between the peak position of the current waveform data and the reference peak position can be a measure of the difference between the peak position of the current waveform data and the reference peak position, and this difference can be quantified by means of time difference, phase difference, position coordinate difference, etc. Correspondingly, the degree of deviation between the trough position of the current waveform data and the reference trough position can be a measure of the difference between the trough position of the current waveform data and the reference trough position.
[0095] The preset deviation threshold may be a pre-set upper limit of acceptable deviation. If the deviation between the peak position of the current waveform data and the reference peak position and / or the deviation between the trough position of the current waveform data and the reference trough position exceeds the preset deviation threshold, it indicates that the current waveform data has significantly deviated from the characteristics under normal conditions. This deviation is likely caused by interference with the current signal, local faults in the target return cable (such as poor contact, insulation damage, etc.), or abnormal performance of related electrical equipment. Therefore, it can be identified as abnormality in the current signal and / or the target return cable.
[0096] In the technical solution, optionally, the abnormality identification unit is further used to:
[0097] Performing spectrum analysis on the current waveform data and determining the harmonic component content in the spectrum analysis result;
[0098] Determining the normal harmonic component content according to the subway operation stage;
[0099] When the harmonic component content exceeds the normal harmonic component content, it is recognized that an abnormality exists in the current signal and / or the target return cable.
[0100] Spectrum analysis is a technical means of converting time domain signals into frequency domain signals for analysis. The spectrum analysis method for current waveform data can be performed by Fourier transforming the current waveform data to obtain the spectrum analysis result.
[0101] The harmonic content may refer to the relative content of other frequency components in the current signal except the fundamental wave. The harmonic content in the spectrum analysis result may be determined by determining the amplitude corresponding to each harmonic according to the fundamental wave frequency, thereby obtaining the harmonic content by statistics.
[0102] The normal harmonic component content may be a normal range or standard value of the harmonic component content determined for different subway operation stages. The method for determining the normal harmonic component content according to the subway operation stage may be to obtain subway historical operation data, perform spectrum analysis and statistical analysis for each subway operation stage, obtain the normal harmonic component content corresponding to each subway operation stage, and query with the current subway operation stage as the query condition to determine the normal harmonic component content corresponding to the current subway operation stage.
[0103] The harmonic component content exceeds the normal harmonic component content, indicating that the return current characteristics have deviated from the harmonic level under normal operating conditions. This may be due to the target return cable being connected to too many nonlinear loads, causing the current waveform to be distorted, or the target return cable itself has a fault, such as insulation aging, partial discharge, etc., which affects the normal transmission of the return current and causes an abnormal increase in harmonics. Therefore, it can be identified that there is an abnormality in the current signal and / or the target return cable.
[0104] The following is a sample code to identify if there is an anomaly in the current signal and / or the target return cable:
[0105] import numpy as np
[0106] #Simulate the acquisition of subway historical operation data and process it to obtain normal parameters at each stage#This is just a simple simulation of the data structure. In actual applications, it is necessary to obtain statistical analysis from real data
[0107]
[0108]
[0109]
[0110] The benefit of this arrangement of the present scheme is that by performing spectrum analysis on the current waveform data, the harmonic component content in the spectrum analysis results can be determined. When the harmonic component content exceeds the normal harmonic component content, it can be identified as an abnormality in the current signal and / or the target return cable. From the key dimension of harmonic characteristics, the potential abnormal conditions of the current signal and the target return cable can be keenly captured, and hidden dangers that may affect the stability and safety of the subway power supply can be accurately located at an early stage.
[0111] The benefit of such a configuration of the present scheme is that by identifying that there is an abnormality in the current signal and / or the target return cable when the current waveform data exceeds the normal current fluctuation range and / or the degree of deviation between the peak position of the current waveform data and the reference peak position and / or the degree of deviation between the trough position of the current waveform data and the reference trough position exceeds a preset deviation threshold, the rich information contained in the current waveform can be fully utilized to comprehensively and accurately capture abnormal conditions during the operation of the current signal and the target return cable, effectively avoiding missed judgments or misjudgments that may result from a single judgment condition.
[0112] The benefit of this arrangement of the present scheme is that by determining at least one subway operation stage and the current waveform data corresponding to the subway operation stage based on the digital signal, and identifying whether there is an abnormality in the current signal and / or the target return cable based on the subway operation stage and the current waveform data, the return current characteristics of different subway operation stages can be considered to achieve accurate and dynamic monitoring of the operating status of the subway traction return cable.
[0113] Embodiment 4
[0114] Figure 4 Schematic diagram of the process of monitoring the subway traction return cable provided in the fourth embodiment of the present application. Figure 4 As shown, the specific steps include:
[0115] S401, determining a target return cable from among the return cables through a cable determination module;
[0116] S402, acquiring a current signal on the target return cable through a signal acquisition module, and converting the current signal into a digital signal;
[0117] S403: Identify whether the current signal and / or the target return cable has an abnormality according to the digital signal through an abnormality identification module, and generate corresponding abnormality prompt information if an abnormality is identified.
[0118] In an embodiment of the present application, a target return cable is determined among the return cables through a cable determination module; a current signal on the target return cable is acquired through a signal acquisition module, and the current signal is converted into a digital signal; an abnormality identification module is used to identify whether the current signal and / or the target return cable has an abnormality based on the digital signal, and when an abnormality is identified, a corresponding abnormality prompt message is generated. The above-mentioned subway traction return cable monitoring method can help timely discover abnormal conditions of the subway traction return cable during operation, thereby ensuring the safe and stable operation of the subway traction power supply system, by identifying whether the current signal and / or the target return cable has an abnormality based on the digital signal of the target return cable, and generating corresponding abnormality prompt messages when an abnormality is identified.
[0119] The monitoring method for subway traction return cable provided in the embodiment of the present application corresponds to the monitoring device for subway traction return cable provided in the above embodiment, and has the same functional modules and beneficial effects. To avoid repetition, they will not be described here.
[0120] Embodiment 5
[0121] like Figure 5 As shown, an embodiment of the present application also provides an electronic device 500, including a processor 501, a memory 502, and a program or instruction stored in the memory 502 and executable on the processor 501. When the program or instruction is executed by the processor 501, each process of the above-mentioned subway traction return cable monitoring device embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.
[0122] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.
[0123] Embodiment 6
[0124] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned subway traction return cable monitoring device embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.
[0125] The processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.
[0126] Embodiment 7
[0127] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned subway traction return cable monitoring device embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
[0128] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.
[0129] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.
[0130] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.
[0131] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
[0132] The above are only preferred embodiments of the present application and the technical principles used. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions that can be made by those skilled in the art will not deviate from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.
Claims
1. A monitoring device for subway traction return cable, characterized in that: The device comprises: A cable determination module, used for determining a target return cable among the return cables; A signal acquisition module, used for acquiring a current signal on the target return cable and converting the current signal into a digital signal; The abnormality identification module is used to identify whether the current signal and / or the target return cable has an abnormality according to the digital signal, and generate corresponding abnormality prompt information when it is identified that an abnormality exists.
2. The monitoring device for subway traction return cable according to claim 1 is characterized in that: The cable determination module is specifically used for: Obtain historical subway operation data; Determine the average value of the carrying current data of each return cable in a key stage according to the historical operation data of the subway; wherein the key stage includes at least one of a traction stage, a coasting stage, and a braking stage; The return cable whose average value exceeds a preset average current threshold is determined as a target return cable.
3. The monitoring device for subway traction return cable according to claim 2 is characterized in that: The cable determination module is further used for: A return cable connected to a subway safety system is determined as a target return cable; wherein the subway safety system includes at least one of an emergency braking system and a door control system.
4. The monitoring device for subway traction return cable according to claim 1 is characterized in that: The abnormality identification module comprises: a stage determination unit, configured to determine at least one subway operation stage and current waveform data corresponding to the subway operation stage according to the digital signal; an abnormality identification unit, used for identifying whether the current signal and / or the target return cable has an abnormality according to the subway operation stage and the current waveform data; The prompt generating unit is used to generate corresponding abnormal prompt information when an abnormality is identified.
5. The monitoring device for subway traction return cable according to claim 4 is characterized in that: The abnormality identification unit is specifically used for: Determine the normal current fluctuation range, the reference peak position and the reference trough position according to the subway operation stage; When the current waveform data exceeds the normal current fluctuation range, identifying that the current signal and / or the target return cable is abnormal; and / or, Determine the degree of deviation between the peak position of the current waveform data and the reference peak position and the degree of deviation between the trough position of the current waveform data and the reference trough position, and identify that the current signal and / or the target return cable are abnormal when the degree of deviation exceeds a preset deviation threshold.
6. The monitoring device for subway traction return cable according to claim 5, characterized in that: The abnormality identification unit is further used for: Performing spectrum analysis on the current waveform data and determining the harmonic component content in the spectrum analysis result; Determining the normal harmonic component content according to the subway operation stage; When the harmonic component content exceeds the normal harmonic component content, it is recognized that an abnormality exists in the current signal and / or the target return cable.
7. The monitoring device for subway traction return cable according to claim 1, characterized in that: The signal acquisition module is specifically used for: Acquiring current signals at at least two locations on the target return cable; Converting the current signal into a digital signal and performing time alignment on the digital signal; and / or, Acquiring a current signal on the target return cable by using at least two types of sensors; The current signal is converted into a digital signal, and the digital signal is normalized.
8. A method for monitoring a subway traction return cable, characterized in that: The method comprises: Determine a target return cable among the return cables by means of a cable determination module; Acquire the current signal on the target return cable through a signal acquisition module, and convert the current signal into a digital signal; The abnormality identification module identifies whether the current signal and / or the target return cable has abnormality according to the digital signal, and generates corresponding abnormality prompt information when it is identified that the abnormality exists.
9. The method for monitoring subway traction return cables according to claim 8, characterized in that: The target return cable is determined in each return cable by the cable determination module, including: Obtain historical subway operation data; Determine the average value of the carrying current data of each return cable in a key stage according to the historical operation data of the subway; wherein the key stage includes at least one of a traction stage, a coasting stage, and a braking stage; The return cable whose average value exceeds a preset average current threshold is determined as a target return cable.
10. An electronic device, characterized in that: It comprises a processor, a memory and a program or instruction stored in the memory and executable on the processor, wherein when the program or instruction is executed by the processor, the steps of the method for monitoring the subway traction return cable as described in any one of claims 8 to 9 are implemented.