Method and device for analyzing subway interference on pipeline based on multi-point synchronous monitoring

Abstract

The invention provides a method and device for analyzing subway interference on a pipeline based on multi-point synchronous monitoring, and the method comprises the steps: synchronously collecting pipeline power-on potentials of a plurality of monitoring points which are arranged according to a preset mode, and collecting environment parameters and train parameters at the same time; data analysis is carried out, wherein the fluctuation period and waveform rule of the pipe-to-ground potential in the subway operation time period are analyzed; counting the pipe-to-ground potential in the train stopping time period at night; analyzing the interference level of the monitoring points along the pipeline; judging whether the OVPD device of the subway station is conducted or not; carrying out subway stray current inflow and outflow rule analysis; and according to a data analysis result, corrosion risk prediction and generation of pipeline interference protection position guidance suggestions are carried out. According to the invention, the accuracy of interference analysis is improved.

Description

Technical Field

[0001] This invention relates to the field of pipeline corrosion protection and subway stray current interference monitoring technology, and in particular to an analysis method and device for pipeline interference caused by subway based on multi-point synchronous monitoring. Background Technology

[0002] The corrosive impact of stray currents from subways on buried metal pipelines is becoming increasingly prominent. Current conventional monitoring methods mostly employ single-point independent monitoring, lacking synchronized data across multiple measuring points, making it impossible to accurately analyze the inflow and outflow patterns of stray currents in the pipelines. Furthermore, existing methods are insufficient in identifying interference sources on the subway side, making it difficult to accurately determine the discharge path and key affected areas of stray currents, thus impacting the precise deployment of protective measures. Summary of the Invention

[0003] The present invention aims to provide an analysis method and apparatus for pipeline interference caused by subway based on multi-point synchronous monitoring to overcome or at least partially solve the above problems.

[0004] To achieve the above objectives, the technical solution of the present invention is specifically implemented as follows: One aspect of the present invention provides an analysis method for pipeline interference caused by subway based on multi-point synchronous monitoring, comprising: The pipeline energization potential of multiple monitoring points deployed in a preset manner is collected simultaneously, along with environmental parameters and train parameters. The interference characteristics and sources were analyzed, including: analyzing the fluctuation period and waveform of the pipeline ground potential during subway operation; statistically analyzing the pipeline ground potential during nighttime train shutdown periods; analyzing the interference level of monitoring points along the pipeline; determining whether the OVPD device in the subway station is conducting; and analyzing the inflow and outflow patterns of stray currents in the subway. Based on the data analysis results, corrosion risk prediction and guidance on pipeline interference protection locations are generated.

[0005] Optionally, the multiple monitoring points deployed in a preset manner include: the intersection with the subway and its upstream and downstream locations, and the location of the insulation joint at the far end of the pipeline.

[0006] Optionally, the environmental parameters include soil resistivity and ground potential gradient; the train parameters include the track-to-ground potential within the subway station and the current flowing through the OVPD device.

[0007] Optionally, the analysis of the fluctuation period and waveform pattern of the pipe-to-ground potential during the subway operation period includes: Plot the curve of the pipeline energization potential at the monitoring point changing over time; Determine whether the pipe-to-ground potential-time curve conforms to the typical interference characteristics of dynamic DC interference in subways; The subway fluctuation cycles occurring at the monitoring points within a preset time period are analyzed, the frequency proportion of each subway fluctuation cycle within the preset time period is calculated, and the distribution pattern of the subway fluctuation cycles is analyzed.

[0008] Optionally, the level of interference at the monitoring points along the analysis pipeline includes: Acquire the energized potential data of the monitoring points during the same monitoring period, and calculate the maximum, minimum and average energized potential of each monitoring point during the same period; The study analyzes the degree of interference at monitoring points along the pipeline, identifies the locations of the maximum and minimum interference along the pipeline, plots the distribution curves of the maximum, minimum, and average energized potentials with the location of monitoring points, and analyzes the correlation between the distribution locations of the maximum and minimum energized potentials and the distance between the pipeline and the subway.

[0009] Optionally, determining whether the OVPD device in the subway station is activated includes: Based on the track-to-ground potential at the monitoring station's OVPD device, the current flowing through the OVPD device, and the trend of pipe-to-ground potential changes, the time period before and after the OVPD device is turned on is determined, and the maximum, minimum, and average values ​​of the pipe-to-ground potential in the turned-on state are identified. The correlation between the magnitude of the current flowing through the OVPD device during operation and the maximum value of the pipe-to-ground potential was analyzed. The proportion of OVPD operation time was analyzed, and the maximum interference level of the pipeline when the OVPD device was in operation during the monitoring period was analyzed.

[0010] Optionally, the analysis of the stray current inflow and outflow patterns in the subway includes: The data from the monitoring points are time-aligned to observe the positive and negative deviations of the pipeline potential within the same preset time period. If, at the same time, the positive and negative directions of the pipeline potential fluctuations are opposite in a certain interval and another monitoring point interval, then the pipeline positions in the two intervals are determined to be the stray current inflow and outflow areas for each other.

[0011] Optionally, the step of generating guidance on pipeline interference protection locations based on data analysis results includes: Calculate the potential deviation between the instantaneous potential and the nighttime potential at the monitoring point at the same time. Based on the magnitude of the potential deviation, determine the distribution location of the main stray current inflow and outflow points, and generate opinions to guide the selection of the location of the auxiliary anode ground bed for pipeline forced current protection or the location of the pipeline polarity drainage ground bed.

[0012] Optionally, the corrosion risk prediction based on the data analysis results includes: By calculating the potential offset at each monitoring point and combining the monitoring points equipped with corrosion inspection plates, a risk prediction model for the correlation between potential offset and corrosion rate is established to predict pipeline corrosion risk.

[0013] Another aspect of the present invention provides an analysis device for pipeline interference caused by subway based on multi-point synchronous monitoring, comprising: The data acquisition module is used to simultaneously acquire the pipeline energization potential of multiple monitoring points deployed in a preset manner, and to simultaneously acquire environmental parameters and train parameters. The analysis module is used to analyze interference characteristics and sources, including: analyzing the fluctuation period and waveform of the pipeline ground potential during subway operation; statistically analyzing the pipeline ground potential during nighttime train shutdown periods; analyzing the interference level of monitoring points along the pipeline; determining whether the OVPD device in the subway station is conducting; and analyzing the inflow and outflow patterns of stray currents in the subway. The output module is used to generate corrosion risk prediction and pipeline interference protection location guidance based on data analysis results. Therefore, the analysis method and device for pipeline interference caused by subway based on multi-point synchronous monitoring provided by this invention, based on synchronous monitoring data, performs specific data analysis, further clarifying the key locations, current magnitudes, impact ranges, and inflow / outflow variation patterns of the rail discharge current, revealing the distribution characteristics and variation patterns of the discharge current, and by determining the subway interference source (OVPD conduction), it grasps the key causes of pipeline interference and the control methods for subway-side discharge current, thus improving the accuracy of interference analysis. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A flowchart illustrating the analysis method for pipeline interference caused by subway based on multi-point synchronous monitoring provided in this embodiment of the invention; Figure 2 This is a schematic diagram of the monitoring point layout provided in an embodiment of the present invention; Figure 3 A flowchart illustrating a specific example of an analysis method for pipeline interference caused by subway based on multi-point synchronous monitoring, provided by an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an analysis device for pipeline interference caused by subway based on multi-point synchronous monitoring, provided in an embodiment of the present invention. Detailed Implementation

[0016] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0017] Table 1 Figure 1 The flowchart illustrates the analysis method for pipeline interference caused by subway based on multi-point synchronous monitoring provided in this embodiment of the invention. Figure 2 The flowchart illustrates a specific example of an analysis method for pipeline interference caused by subway based on multi-point synchronous monitoring, provided by an embodiment of the present invention. (See Table 1 for details.) Figure 1 and Figure 2 The method for analyzing pipeline interference caused by subway based on multi-point synchronous monitoring provided in this embodiment of the invention includes: S1 synchronously collects the pipeline energization potential of multiple monitoring points deployed in a preset manner, and simultaneously collects environmental parameters and train parameters.

[0018] Specifically, the present invention can perform multi-point synchronous monitoring of pipeline parameters and acquire environmental and train parameters.

[0019] As an optional implementation of this invention, the multiple monitoring points deployed in a preset manner include: the locations of intersections with the subway and their upstream and downstream locations, and the locations of the insulation joints at the far ends of the pipeline.

[0020] In practice, uDL2 data loggers are installed at multiple monitoring points of a pipeline for synchronous monitoring. First, all cathodic protection systems of the pipeline should be shut down. The pipeline monitoring range includes the intersection with the subway and its upstream and downstream, as well as the location near the pipeline insulation joint (far end of the pipeline). The monitoring cycle is more than 24 hours, the monitoring frequency is 1 data point / second, and the monitoring parameter is the pipeline energization potential. Figure 3 The diagram illustrates the layout of a specific monitoring point. uDL2 and portable copper sulfate reference electrodes can be installed at monitoring points 1, 2, 3, 4 (intersection of subway and pipeline), 5, 6, and 7; however, the present invention is not limited to this.

[0021] As an optional embodiment of the present invention, the environmental parameters include soil resistivity and ground potential gradient; the train parameters include the rail-to-ground potential in the subway station and the current flowing through the OVPD device (Over-Voltage Protection Device).

[0022] In specific implementation, the environmental parameters of the present invention may include: recording the soil resistivity and geopotential gradient near the monitoring point, and if a corrosion rate test piece is preset in the early stage, obtaining the corrosion rate of the monitoring point.

[0023] The train parameters include: a uDL1 data logger and a portable copper sulfate reference electrode are installed at the rail-to-ground potential limiter inside the subway station to monitor and record the rail-to-ground potential; a current loop is installed in the circuit of the rail-to-ground potential limiter inside the subway station, and the data of the current loop is recorded by the uDL1 data logger to monitor and record the current flowing through after the OVPD is closed.

[0024] S2, conduct data analysis, including: analyzing the fluctuation period and waveform pattern of the pipeline ground potential during subway operation; statistically analyzing the pipeline ground potential during nighttime train shutdown periods; analyzing the interference level of monitoring points along the pipeline; determining whether the OVPD device in the subway station is conducting; and analyzing the inflow and outflow patterns of stray currents in the subway.

[0025] Specifically, the present invention can S3, based on the data analysis results, generates corrosion risk prediction and guidance on pipeline interference protection locations.

[0026] Specifically, the present invention can perform the following data analysis: 1. The relative positional relationship between the subway interference source and the buried pipeline; 2. The waveform pattern and fluctuation period of the pipeline ground potential during subway operation; 3. Pipe-to-ground potential during nighttime train shutdown periods (pipe potential in interference-free state). 4. The pipeline is subject to disturbance for more than 24 hours; 5. Is the OVPD device in the subway station connected? 6. The inflow and outflow patterns of stray currents in subways; 7. Determine the main inflow and outflow points and distribution locations of stray currents in the pipeline.

[0027] As an optional embodiment of the present invention, the analysis of the fluctuation period and waveform pattern of the pipeline-to-ground potential during the subway operation period includes: Plot the curve of the pipeline energization potential at the monitoring point changing over time; Determine whether the pipe-to-ground potential-time curve conforms to the typical interference characteristics of dynamic DC interference in subways; The subway fluctuation cycles occurring at the monitoring points within a preset time period are analyzed, the frequency proportion of each subway fluctuation cycle within the preset time period is calculated, and the distribution pattern of the subway fluctuation cycles is analyzed.

[0028] In specific implementation, Figure 3Taking the installation method of monitoring points as an example, this invention analyzes the waveform pattern and fluctuation period of the pipeline ground potential during subway operation in the following way: Plot the pipeline potential variation curves over time at seven monitoring points to determine if the pipeline-to-ground potential-time curves conform to the typical characteristics of dynamic DC interference in subways: the pipeline-to-ground potential fluctuates drastically during train operation hours and fluctuates gently during nighttime train shutdown hours. The interference fluctuation period is defined as follows: the pipeline-to-ground potential waveform consists of many small peaks, exhibiting a repetitive upward and downward change, showing periodic repetition. Based on the definition of fluctuation period, the subway fluctuation periods (based on the time interval between adjacent peaks) occurring at the seven monitoring points during three time periods—8:00-9:00, 12:00-13:00, and 18:00-19:00—were statistically analyzed. The frequency proportion of each subway fluctuation period during morning and evening peak hours and normal operation was also statistically analyzed to understand the distribution pattern of subway fluctuation periods.

[0029] This invention can also statistically analyze the pipeline-to-ground potential (pipeline potential in an interference-free state) during the period when trains stop operating at night. That is, after the trains stop operating at night, the pipeline is in a state of no subway interference and no cathodic protection system is in operation due to the shutdown of the pipeline cathodic protection system. The pipeline-to-ground potential in this state is recorded.

[0030] As an optional embodiment of the present invention, the level of interference at the monitoring points along the pipeline includes: Acquire the energized potential data of the monitoring points during the same monitoring period, and calculate the maximum, minimum and average energized potential of each monitoring point during the same period; The study analyzes the degree of interference at monitoring points along the pipeline, identifies the locations of the maximum and minimum interference along the pipeline, plots the distribution curves of the maximum, minimum, and average energized potentials with the location of monitoring points, and analyzes the correlation between the distribution locations of the maximum and minimum energized potentials and the distance between the pipeline and the subway.

[0031] In specific implementation, Figure 3 Taking the installation method of monitoring points as an example, this invention analyzes the interference level of monitoring points along the pipeline in the following way: Seven monitoring points were selected to collect energized potential data for the same monitoring period (≥24h). The maximum, minimum, and average energized potential values ​​for each monitoring point during the same period were statistically analyzed. The degree of interference at the monitoring points along the pipeline was analyzed, and the locations of the maximum and minimum interference along the pipeline were identified. By analyzing the distribution curves of the maximum and average energized potential values ​​with the location of the monitoring points, the correlation between the distribution location of the maximum and average energized potential values ​​and the distance between the pipeline and the subway was explored.

[0032] As an optional implementation of this invention, determining whether the subway station OVPD device is activated includes: Based on the track-to-ground potential at the monitoring station's OVPD device, the current flowing through the OVPD device, and the trend of pipe-to-ground potential changes, the time period before and after the OVPD device is turned on is determined, and the maximum, minimum, and average values ​​of the pipe-to-ground potential in the turned-on state are identified. The correlation between the magnitude of the current flowing through the OVPD device during operation and the maximum value of the pipe-to-ground potential was analyzed. The proportion of OVPD operation time was analyzed, and the maximum interference level of the pipeline when the OVPD device was in operation during the monitoring period was analyzed.

[0033] In practical implementation, this invention can monitor the track-to-ground potential at the OVPD device in the subway station, the current flowing through the OVPD device, and the trend of pipe-to-ground potential changes to identify the time periods before and after the OVPD device is turned on, and statistically analyze the maximum and average values ​​of the pipe-to-ground potential during the on-state. It also analyzes the correlation between the magnitude of the current flowing through the OVPD device during on-state and the maximum / minimum value of the pipe-to-ground potential, analyzes the proportion of OVPD on-state duration, and analyzes the maximum interference level of the OVPD device on the pipeline during the monitoring period.

[0034] As an optional implementation of this invention, the analysis of the stray current inflow and outflow patterns in the subway includes: The data from the monitoring points are time-aligned to observe the positive and negative deviations of the pipeline potential within the same preset time period. If, at the same time, the positive and negative directions of the pipeline potential fluctuations are opposite in a certain interval and another monitoring point interval, then the pipeline positions in the two intervals are determined to be the stray current inflow and outflow areas for each other.

[0035] In specific implementation, Figure 3 Taking the installation method of monitoring points as an example, this invention analyzes the inflow and outflow patterns of stray currents in subways in the following way: The test data from the seven monitoring points were time-aligned, and the positive and negative deviations of the pipeline potential were observed within a selected time period. At the same moment, if the positive and negative fluctuations of the pipeline potential in one section and another monitoring point section were in opposite directions, it could be determined that the pipeline locations in the two sections were stray current inflow and outflow areas for each other.

[0036] As an optional implementation of this invention, the step of generating pipeline interference protection location guidance based on data analysis results includes: Calculate the potential deviation between the instantaneous potential and the nighttime potential at the monitoring point at the same time. Based on the magnitude of the potential deviation, determine the distribution location of the main stray current inflow and outflow points, and generate opinions to guide the selection of the location of the auxiliary anode ground bed for pipeline forced current protection or the location of the pipeline polarity drainage ground bed.

[0037] In specific implementation, Figure 3Taking the installation method of monitoring points as an example, this invention generates guidance on pipeline interference protection locations in the following way: Select the same moment, calculate the potential offset between the instantaneous potential and the nighttime potential of 7 monitoring points (see Table 2), and determine the distribution of the main stray current inflow and outflow points based on the magnitude of the potential offset, so as to guide the selection of the location of the auxiliary anode ground bed for pipeline forced current protection or the location of the pipeline polarity drainage ground bed.

[0038] Pipeline Potential Deviation Statistics Table 2 As an optional implementation of this invention, the step of predicting corrosion risk based on data analysis results includes: By calculating the potential offset at each monitoring point and combining the monitoring points equipped with corrosion inspection plates, a risk prediction model for the correlation between potential offset and corrosion rate is established to predict pipeline corrosion risk.

[0039] In specific implementation, Figure 3 Taking the installation method of monitoring points as an example, this invention predicts corrosion risk in the following way: By calculating the potential shift of each monitoring point and combining the monitoring points equipped with corrosion inspection plates, a correlation between the potential shift and the corrosion rate is established. The potential shift of the monitoring points can identify the main inflow and outflow locations of stray currents and predict pipeline corrosion risk.

[0040] Therefore, the analysis method for pipeline interference caused by subway based on multi-point synchronous monitoring provided by the embodiments of the present invention has carried out specific data analysis based on synchronous monitoring data, further clarifying the key parts, current magnitude, influence range, and inflow / outflow variation law of the rail discharge current, revealing the distribution characteristics and variation law of the discharge current, and by determining the subway interference source (OVPD conduction), the key reasons for pipeline interference and the control method of subway-side discharge current have been grasped, thus improving the accuracy of interference analysis.

[0041] Figure 4 This diagram illustrates the structure of an analysis device for pipeline interference caused by subway based on multi-point synchronous monitoring, provided in an embodiment of the present invention. This device applies the aforementioned method. The following is only a brief description of the structure of the analysis device; for other matters not covered herein, please refer to the relevant descriptions in the above-described analysis method for pipeline interference caused by subway based on multi-point synchronous monitoring. Figure 4 The analysis device for pipeline interference caused by subway based on multi-point synchronous monitoring provided in this embodiment of the invention includes: The data acquisition module is used to simultaneously acquire the pipeline energization potential of multiple monitoring points deployed in a preset manner, and to simultaneously acquire environmental parameters and train parameters. The analysis module is used to analyze interference characteristics and sources, including: analyzing the fluctuation period and waveform of the pipeline ground potential during subway operation; statistically analyzing the pipeline ground potential during nighttime train shutdown periods; analyzing the interference level of monitoring points along the pipeline; determining whether the OVPD device in the subway station is conducting; and analyzing the inflow and outflow patterns of stray currents in the subway. The output module is used to generate corrosion risk predictions and pipeline interference protection location guidance based on data analysis results.

[0042] As an optional implementation of this invention, the multiple monitoring points deployed in a preset manner include: the locations of intersections with the subway and their upstream and downstream locations, and the locations of the insulation joints at the far ends of the pipeline.

[0043] As an optional embodiment of the present invention, the environmental parameters include soil resistivity and ground potential gradient; the train parameters include the track-to-ground potential in the subway station and the current flowing through the OVPD device.

[0044] As an optional implementation of this invention, the analysis module analyzes the fluctuation period and waveform pattern of the pipe-to-ground potential during the subway operation period in the following manner: Plot the curve of the pipeline energization potential at the monitoring point changing over time; Determine whether the pipe-to-ground potential-time curve conforms to the typical interference characteristics of dynamic DC interference in subways; The subway fluctuation cycles occurring at the monitoring points within a preset time period are analyzed, the frequency proportion of each subway fluctuation cycle within the preset time period is calculated, and the distribution pattern of the subway fluctuation cycles is analyzed.

[0045] As an optional implementation of this invention, the analysis module analyzes the interference level of monitoring points along the pipeline in the following manner: Acquire the energized potential data of the monitoring points during the same monitoring period, and calculate the maximum, minimum and average energized potential of each monitoring point during the same period; The study analyzes the degree of interference at monitoring points along the pipeline, identifies the locations of the maximum and minimum interference along the pipeline, plots the distribution curves of the maximum, minimum, and average energized potentials with the location of monitoring points, and analyzes the correlation between the distribution locations of the maximum and minimum energized potentials and the distance between the pipeline and the subway.

[0046] As an optional implementation of this invention, the analysis module determines whether the OVPD device in the subway station is activated in the following manner: Based on the track-to-ground potential at the monitoring station's OVPD device, the current flowing through the OVPD device, and the trend of pipe-to-ground potential changes, the time period before and after the OVPD device is turned on is determined, and the maximum, minimum, and average values ​​of the pipe-to-ground potential in the turned-on state are identified. The correlation between the magnitude of the current flowing through the OVPD device during operation and the maximum value of the pipe-to-ground potential was analyzed. The proportion of OVPD operation time was analyzed, and the maximum interference level of the pipeline when the OVPD device was in operation during the monitoring period was analyzed.

[0047] As an optional implementation of this invention, the analysis module analyzes the inflow and outflow patterns of stray currents in the subway in the following manner: The data from the monitoring points are time-aligned to observe the positive and negative deviations of the pipeline potential within the same preset time period. If, at the same time, the positive and negative directions of the pipeline potential fluctuations are opposite in a certain interval and another monitoring point interval, then the pipeline positions in the two intervals are determined to be the stray current inflow and outflow areas for each other.

[0048] As an optional implementation of this invention, the output module generates guidance on pipeline interference protection locations based on data analysis results in the following manner: Calculate the potential deviation between the instantaneous potential and the nighttime potential at the monitoring point at the same time. Based on the magnitude of the potential deviation, determine the distribution location of the main stray current inflow and outflow points, and generate opinions to guide the selection of the location of the auxiliary anode ground bed for pipeline forced current protection or the location of the pipeline polarity drainage ground bed.

[0049] As an optional implementation of this invention, the output module performs corrosion risk prediction based on data analysis results in the following manner: By calculating the potential offset at each monitoring point and combining the monitoring points equipped with corrosion inspection plates, a risk prediction model for the correlation between potential offset and corrosion rate is established to predict pipeline corrosion risk.

[0050] Therefore, the analysis device for pipeline interference caused by subway based on multi-point synchronous monitoring provided in this embodiment of the invention has carried out specific data analysis based on synchronous monitoring data, further clarifying the key parts, current magnitude, influence range, and inflow / outflow variation law of the rail discharge current, revealing the distribution characteristics and variation law of the discharge current, and by determining the subway interference source (OVPD conduction), the key reasons for pipeline interference and the control method of subway-side discharge current have been grasped, thus improving the accuracy of interference analysis.

[0051] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0052] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for analyzing pipeline interference caused by subway based on multi-point synchronous monitoring, characterized in that, include: The pipeline energization potential of multiple monitoring points deployed in a preset manner is collected simultaneously, along with environmental parameters and train parameters. Data analysis was conducted, including: analyzing the fluctuation period and waveform pattern of the pipeline ground potential during subway operation; statistically analyzing the pipeline ground potential during nighttime train shutdown periods; analyzing the interference level of monitoring points along the pipeline; determining whether the OVPD device in the subway station is conductive; and analyzing the inflow and outflow patterns of stray currents in the subway. Based on the data analysis results, corrosion risk prediction and guidance on pipeline interference protection locations are generated.

2. The method according to claim 1, characterized in that, The multiple monitoring points set up according to the preset method include: the intersection with the subway and its upstream and downstream locations, and the location of the insulation joint at the far end of the pipeline.

3. The method according to claim 2, characterized in that, The environmental parameters include soil resistivity and ground potential gradient; the train parameters include the track-to-ground potential within the subway station and the current flowing through the OVPD device.

4. The method according to claim 3, characterized in that, The analysis of the fluctuation period and waveform pattern of the pipeline ground potential during the subway operation period includes: Plot the curve of the pipeline energization potential at the monitoring point changing over time; Determine whether the pipe-to-ground potential-time curve conforms to the typical interference characteristics of dynamic DC interference in subways; The subway fluctuation cycles occurring at the monitoring points within a preset time period are analyzed, the frequency proportion of each subway fluctuation cycle within the preset time period is calculated, and the distribution pattern of the subway fluctuation cycles is analyzed.

5. The method according to claim 4, characterized in that, The level of interference at the monitoring points along the analyzed pipeline includes: Acquire the energized potential data of the monitoring points during the same monitoring period, and calculate the maximum, minimum and average energized potential of each monitoring point during the same period; The study analyzes the degree of interference at monitoring points along the pipeline, identifies the locations of the maximum and minimum interference along the pipeline, plots the distribution curves of the maximum, minimum, and average energized potentials with the location of monitoring points, and analyzes the correlation between the distribution locations of the maximum and minimum energized potentials and the distance between the pipeline and the subway.

6. The method according to claim 5, characterized in that, The process of determining whether the OVPD device in the subway station is activated includes: Based on the track-to-ground potential at the monitoring station's OVPD device, the current flowing through the OVPD device, and the trend of pipe-to-ground potential changes, the time period before and after the OVPD device is turned on is determined, and the maximum, minimum, and average values ​​of the pipe-to-ground potential in the turned-on state are identified. The correlation between the magnitude of the current flowing through the OVPD device during operation and the maximum value of the pipe-to-ground potential was analyzed. The proportion of OVPD operation time was analyzed, and the maximum interference level of the pipeline when the OVPD device was in operation during the monitoring period was analyzed.

7. The method according to claim 6, characterized in that, The analysis of the stray current inflow and outflow patterns in the subway includes: The data from the monitoring points are time-aligned to observe the positive and negative deviations of the pipeline potential within the same preset time period. If, at the same time, the positive and negative directions of the pipeline potential fluctuations are opposite in a certain interval and another monitoring point interval, then the pipeline positions in the two intervals are determined to be the stray current inflow and outflow areas for each other.

8. The method according to claim 7, characterized in that, The process of generating guidance on pipeline interference protection locations based on data analysis results includes: Calculate the potential deviation between the instantaneous potential and the nighttime potential at the monitoring point at the same time. Based on the magnitude of the potential deviation, determine the distribution location of the main stray current inflow and outflow points, and generate opinions to guide the selection of the location of the auxiliary anode ground bed for pipeline forced current protection or the location of the pipeline polarity drainage ground bed.

9. The method according to claim 7, characterized in that, The corrosion risk prediction based on data analysis results includes: By calculating the potential offset at each monitoring point and combining the monitoring points equipped with corrosion inspection plates, a risk prediction model for the correlation between potential offset and corrosion rate is established to predict pipeline corrosion risk.

10. An analysis device for pipeline interference caused by subway based on multi-point synchronous monitoring, characterized in that, include: The data acquisition module is used to simultaneously acquire the pipeline energization potential of multiple monitoring points deployed in a preset manner, and to simultaneously acquire environmental parameters and train parameters. The analysis module is used to analyze interference characteristics and sources, including: analyzing the fluctuation period and waveform of the pipeline ground potential during subway operation; statistically analyzing the pipeline ground potential during nighttime train shutdown periods; analyzing the interference level of monitoring points along the pipeline; determining whether the OVPD device in the subway station is conducting; and analyzing the inflow and outflow patterns of stray currents in the subway. The output module is used to generate corrosion risk predictions and pipeline interference protection location guidance based on data analysis results.

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