CN115219823B - Pipeline multipoint synchronous monitoring analysis method and device under railway dynamic alternating current interference - Google Patents
Pipeline multipoint synchronous monitoring analysis method and device under railway dynamic alternating current interference Download PDFInfo
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Abstract
The invention provides a pipeline multipoint synchronous monitoring analysis method and device which are interfered by railway dynamic alternating current, wherein the method comprises the following steps: setting a parameter acquisition system, setting N test points at the pipeline to be monitored, and setting a data recorder for each test point, wherein the data recorder is used for monitoring alternating current interference voltage, alternating current density and on/off electric potential of the test point; m cameras are arranged at the pipeline to be monitored, and the angle of each camera is perpendicular to the railway track and is used for recording the occurrence time of a train; acquiring parameter data, the parameter data comprising: presetting pipeline parameters in monitoring time, train parameters in the monitoring time and environment parameters acquired in advance; calculating and analyzing the interference rules of different test points of the train at the fixed position and the interference rules of the same test point along with the change of the distance in the running process of the train; determining characteristic parameters for corrosion risk discrimination according to the interference law; and judging the corrosion risk according to the characteristic parameters.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a pipeline multipoint synchronous monitoring and analyzing method and device under railway dynamic alternating current interference.
Background
With the rapid development of energy and transportation industry, the situation that a gas pipe network is parallel or crossed with an electrified railway line is more and more, and the buried pipeline is increasingly interfered by stray current. Taking Beijing as an example, the buried steel pipeline of Beijing gas in service is over 1.7 ten thousand kilometers by the end of 2021, in addition, beijing is the biggest railway hub in China, and numerous railway trunks such as Beijing Guangdong line, jinghu line, jijiu line, beijing envelope line, beijing Tong line and the like are led to all places in China in a radial manner, and huge rail transit, power networks and gas pipe networks are densely distributed in Beijing areas, so that the risk of stray current interference is more serious.
There are many cases of ac interference caused by electrified railways to buried pipelines at home and abroad, so dynamic ac interference cannot be ignored. The effective detection and scientific evaluation of the alternating current stray current of the buried pipeline are important measures related to the safe operation of the pipeline. At present, two main problems exist:
firstly, the existing detection method is too simple, the collected parameters are too single, the interference parameters of the system are not comprehensive enough, and the difficulty is brought to subsequent corrosion risk evaluation. The corrosion risk of dynamic alternating current interference is generally underestimated, so that the research foundation for the interference is weaker at home and abroad, the detection method mainly comprises the instantaneous alternating current density detection of a single point, the interference parameter type and the data quantity are too small, and the difficulty is brought to the subsequent interference rule analysis, namely, a more scientific and systematic interference parameter collection and analysis method is not available at present.
And secondly, no distinguishing index aiming at the dynamic alternating current interference degree of the electrified railway is provided, and the distinguishing of the alternating current interference is mainly based on the existing mature steady alternating current interference index. For example, in GB/T50698, the ac interference is not classified into dynamic ac interference and steady ac interference, and therefore, the corresponding discrimination indicators are based on the steady state condition, and no specific evaluation method is formulated for the dynamic ac interference.
Disclosure of Invention
The invention aims to provide a pipeline multipoint synchronous monitoring and analyzing method and device which overcome or at least partially solve the problems and are interfered by railway dynamic alternating current.
In order to achieve the above purpose, the technical scheme of the invention is specifically realized as follows:
the invention provides a pipeline multipoint synchronous monitoring analysis method which is disturbed by railway dynamic alternating current, comprising the following steps: setting a parameter acquisition system, wherein the parameter acquisition system comprises: setting N test points at a pipeline to be monitored, wherein each test point is provided with a data recorder for monitoring alternating current interference voltage, alternating current density and on/off electric potential of the test point; m cameras are arranged at the pipeline to be monitored, and the angle of each camera is perpendicular to the railway track and is used for recording the occurrence time of a train; wherein M is less than or equal to N, and M, N is a positive integer; acquiring parameter data, the parameter data comprising: the method comprises the steps of presetting pipeline parameters in monitoring time, presetting train parameters in the monitoring time and presetting environment parameters, wherein the pipeline parameters comprise: the ac interference voltage, the ac current density, and the on/off potential, the environmental parameters including: soil resistivity, ground potential gradient, and corrosion rate near each of the test points, the train parameters including: the time of occurrence of the train; calculating and analyzing an interference law, wherein the interference law comprises: the interference law of the train at the fixed position and different test points and the interference law of the same test point along with the change of the distance in the running process of the train; determining characteristic parameters for corrosion risk discrimination according to the interference law, wherein the characteristic parameters comprise: high peak ac current density, high frequency peak ac current density and average ac current density; and judging the corrosion risk according to the characteristic parameters.
Wherein, n=5, m=3, and the M cameras are respectively disposed at the first test point, the third test point and the fifth test point.
The calculating and analyzing the interference rule of different test points of the train at the fixed position comprises the following steps: acquiring time T of train passing by a first camera through the camera 1 Obtaining the test points in (T 1 -Smin,T 1 And +Smin), calculating the distribution rule of the disturbance voltage and the current density of the pipeline when each test point of the train appears.
The calculation and analysis of the interference law of the same test point along with the change of the distance in the running process of the train comprises the following steps: respectively calculating the speed V of the train in the first section Vehicle speed 1-3 ＝L 0 /(T 3 -T 1 ) And the vehicle speed V of the second stage Vehicle speed 3-5 ＝L 0 /(T 5 -T 3 ) Wherein T is 1 For the time of the train passing through the first camera, T 3 For the time of the train passing through the second camera, T 5 For the time of the train passing through the third camera, L 0 The distance is the vertical projection distance of two adjacent cameras on the track; comparing the speed of the first section with the speed of the second section, judging whether the train runs at a constant speed, accelerates or decelerates, and calculating the distance between each test point and the train at each moment; and calculating the position of the train when the peak value occurs at the position of each test point, and obtaining the position of the stray current leakage and the leakage rule of each railway.
Wherein, the evaluating the corrosion risk according to the characteristic parameters includes: determining interference risk points; performing pipeline corrosion risk judgment on the interference risk points; a pipe interference protection scheme is generated.
In another aspect, the present invention provides a pipeline multipoint synchronization monitoring and analyzing device that is interfered by railway dynamic ac, including: the acquisition module is used for acquiring parameter data, wherein the parameter data comprises: the method comprises the steps of presetting pipeline parameters in monitoring time, presetting train parameters in the monitoring time and presetting environment parameters, wherein the pipeline parameters comprise: alternating current interference voltage, alternating current density and on/off potential, the environmental parameters including: soil resistivity, ground potential gradient, and corrosion rate near each test point, the train parameters including: the time of occurrence of the train; the parameter data are obtained by the following steps: setting a parameter acquisition system, wherein the parameter acquisition system comprises: setting N test points at a pipeline to be monitored, wherein each test point is provided with a data recorder for monitoring the alternating current interference voltage, the alternating current density and the on/off electric potential of the test point; m cameras are arranged at the pipeline to be monitored, and the angle of each camera is perpendicular to a railway track and is used for recording the occurrence time of the train; wherein M is less than or equal to N, and M, N is a positive integer; the calculation module is used for calculating and analyzing an interference rule, and the interference rule comprises: the interference law of the train at the fixed position and different test points and the interference law of the same test point along with the change of the distance in the running process of the train; the determining module is used for determining characteristic parameters for corrosion risk discrimination according to the interference law, wherein the characteristic parameters comprise: high peak ac current density, high frequency peak ac current density and average ac current density; and the judging module is used for judging the corrosion risk according to the characteristic parameters.
Wherein, n=5, m=3, and the M cameras are respectively disposed at the first test point, the third test point and the fifth test point.
The calculation module calculates and analyzes the interference rules of different test points of the train at the fixed position by the following modes: acquiring time T of train passing by a first camera through the camera 1 Obtaining the test points in (T 1 -Smin,T 1 And +Smin), calculating the distribution rule of the disturbance voltage and the current density of the pipeline when each test point of the train appears.
Wherein the calculation module is implemented by the following stepsThe method calculates and analyzes the interference law of the same test point along with the change of the distance in the running process of the train: respectively calculating the speed V of the train in the first section Vehicle speed 1-3 ＝L 0 /(T 3 -T 1 ) And the vehicle speed V of the second stage Vehicle speed 3-5 ＝L 0 /(T 5 -T 3 ) Wherein T is 1 For the time of the train passing through the first camera, T 3 For the time of the train passing through the second camera, T 5 For the time of the train passing through the third camera, L 0 The distance is the vertical projection distance of two adjacent cameras on the track; comparing the speed of the first section with the speed of the second section, judging whether the train runs at a constant speed, accelerates or decelerates, and calculating the distance between each test point and the train at each moment; and calculating the position of the train when the peak value occurs at the position of each test point, and obtaining the position of the stray current leakage and the leakage rule of each railway.
The evaluation module evaluates the corrosion risk according to the characteristic parameters in the following manner: determining interference risk points; performing pipeline corrosion risk judgment on the interference risk points; a pipe interference protection scheme is generated.
Therefore, the method and the device for monitoring and analyzing the pipeline with the railway dynamic alternating current interference by the multipoint synchronization can be used for acquiring the dynamic alternating current interference parameters by utilizing the multipoint synchronous monitoring mode, so that the limitation of interference degree analysis caused by single-point instantaneous detection is avoided, and the interference risk of the pipeline in a complete period of one day can be represented. Through collecting a plurality of parameters such as pipeline, environment, train, etc. provide data support for follow-up interference law deep analysis, provide the help for pipeline circuit design and corrosion risk point screening simultaneously. By formulating a scientific data analysis method, the method for judging the corrosion risk of the pipeline by dynamic communication and steady state communication is effectively distinguished, so that the corrosion risk judging result is more accurate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for monitoring and analyzing pipeline multipoint synchronization under railway dynamic alternating current interference provided by an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating the installation of a parameter acquisition system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the corrosion rate and the high peak AC current density provided by an embodiment of the present invention;
FIG. 4 is a graph showing the average values of the corrosion rate and the AC current density according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of corrosion rate and high frequency peak AC current density provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a specific flow of a method for monitoring and analyzing multiple points of a pipeline under dynamic AC interference of a railway according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a pipeline multipoint synchronous monitoring and analyzing device subject to railway dynamic alternating current interference according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below 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 embodied 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.
Fig. 1 shows a flowchart of a method for monitoring and analyzing pipeline multipoint synchronization under railway dynamic ac interference provided by an embodiment of the present invention, referring to fig. 1, the method for monitoring and analyzing pipeline multipoint synchronization under railway dynamic ac interference provided by an embodiment of the present invention includes:
s1, setting a parameter acquisition system, wherein the parameter acquisition system comprises: setting N test points at the pipeline to be monitored, wherein each test point is provided with a data recorder for monitoring alternating current interference voltage, alternating current density and on/off electric potential of the test point; m cameras are arranged at the position of the pipeline to be monitored, and the angle of each camera is perpendicular to the railway track and is used for recording the occurrence time of the train; wherein M is less than or equal to N, and M, N is a positive integer;
s2, acquiring parameter data, wherein the parameter data comprises: the method comprises the steps of presetting pipeline parameters in monitoring time, presetting train parameters in the monitoring time and presetting environment parameters, wherein the pipeline parameters comprise: alternating current interference voltage, alternating current density, on/off potential, environmental parameters include: soil resistivity, ground potential gradient, and corrosion rate near each test point, train parameters include: the time of train occurrence.
Specifically, a parameter acquisition system is preset, and the parameter acquisition system monitors pipeline parameters in a multi-point synchronous monitoring mode. In specific implementation, the test piece can be 1cm < 2 >, a uDL data recorder is installed on a plurality of test points of a certain pipeline, the monitoring period is more than 24 hours, and the monitored pipeline parameters are alternating current interference voltage, alternating current density and on/off electric potential. Meanwhile, a plurality of cameras are arranged on the same pipeline, the angles of the cameras are perpendicular to the railway track, and the occurrence time of the train is recorded, so that the train parameters are obtained.
In addition, the invention also acquires environmental parameters in advance, namely records the soil resistivity and the ground potential gradient near the test point, and if a corrosion rate test piece is preset in the early stage, the corrosion rate of the test point is taken out and acquired.
As an optional implementation manner of the embodiment of the present invention, n=5, m=3, and m cameras are respectively disposed at the first test point, the third test point, and the fifth test point. Referring to fig. 2, the data logger is set uDL at the test points 1, 2, 3, 4 and 5, and cameras (the angles of the cameras are perpendicular to the track) are set at the test points 1, 3 and 5, and other parameters can be obtained simultaneously: for example, the distance L of the vertical projection of two adjacent cameras on the track measured by a hundred-degree or Aowei map 0 。
By using the data recorder uDL2 to realize 24-hour monitoring, the limitation of interference degree judgment caused by instantaneous detection is eliminated.
S3, calculating and analyzing an interference rule, wherein the interference rule comprises: the interference rule of different test points of the train at a fixed position and the interference rule of the same test point along with the change of the distance in the running process of the train.
As an optional implementation manner of the embodiment of the present invention, calculating and analyzing the interference law of different test points of the train at the fixed position includes: acquiring time T of train passing by first camera through camera 1 Obtaining the test points in (T 1 -Smin,T 1 And +Smin), calculating the distribution rule of the disturbance voltage and the current density of the pipeline when each test point of the train appears.
As an optional implementation manner of the embodiment of the invention, calculating and analyzing the interference rule of the same test point along with the change of the distance in the running process of the train comprises the following steps: respectively calculating the speed V of the train in the first section Vehicle speed 1-3 ＝L 0 /(T 3 -T 1 ) And the vehicle speed V of the second stage Vehicle speed 3-5 ＝L 0 /(T 5 -T 3 ) Wherein T is 1 For the time of the train passing through the first camera, T 3 For the time of the train passing through the second camera, T 5 For the time of the train passing through the third camera, L 0 The distance is the vertical projection distance of two adjacent cameras on the track; comparing the speed of the first section with the speed of the second section, judging whether the train runs at a constant speed, accelerates or decelerates, and calculating the distance between each test point and the train at each moment; and when the peak value occurs at the position of each test point, calculating the position of the train to obtain the position and the leakage rule of the stray current leakage of each railway.
When the method is specifically implemented, the interference law discussion can be carried out, and the method is used for guiding the design of the interference protection of the pipeline and the screening of corrosion risk points.
(1) The interference rule of different test points of the train at a fixed position:
reading train passing cameraTime T of head 1 1 Screening test points 1-5 at (T 1 -20min,T 1 +20min), and discussing the interference rule of the test points 1-5 at each fixed time point of the train. The distribution rule of the disturbance voltage and the current density of the pipeline when each test point of the train appears is discussed. The method can judge the high-frequency peak value and the correlation between the appearance of the high-peak alternating current parameter and the train running position, and provide basis for the subsequent shortening of the monitoring time (for example, the train is in T) 1 The high-frequency peak value obtained by monitoring statistics in a certain period of time before and after the moment is consistent with the high-peak alternating current parameter, and the monitoring can be carried out for a short time in a specific time without 24 hours, so that the resource is saved). The method is used for judging the position of the interference peak point of the pipeline and the position point at which the protective measures need to be taken.
(2) In the running process of the train, the interference rule of the same test point along with the change of the distance between the two test points is as follows:
V vehicle speed 1-3 ＝L 0 /(T 3 -T 1 )，V Vehicle speed 3-5 ＝L 0 /(T 5 -T 3 ) By calculating the train speeds of 2 sections and comparing the train speeds of two sections, whether the train is running at a constant speed, accelerating or decelerating can be judged. The distance between the test point and the train at each moment can be calculated and measured by combining the speed and the map. According to the method, the condition that the interference parameters change from large to small along with the distance between the two, and from small to large, the corresponding relation between the interference parameters and the distance between the two is established, and data support is provided for the design of a newly-built pipeline. The position of the train when the peak value occurs at the position of each measuring point can be calculated, and the position of the stray current leakage and the leakage rule of each railway can be judged.
S4, determining characteristic parameters for corrosion risk discrimination according to an interference rule, wherein the characteristic parameters comprise: high peak ac current density, high frequency peak ac current density, average ac current density.
Specifically, the invention performs characteristic parameter screening for subsequent corrosion risk evaluation. The correlation between the alternating current density and the corrosion rate is established by respectively counting the high-peak alternating current density, the high-frequency peak alternating current density and the average alternating current density according to 24-hour monitoring data of the test points and combining the test points provided with the corrosion test pieces. It is evident from a combination of fig. 3 to 5 that the correlation between the high frequency peak ac current density and the dynamic ac interference test piece corrosion rate is highest, and the test piece corrosion rate increases with the increase of the high frequency peak ac current density. The correlation between the high-frequency peak alternating current density and the corrosion rate can be obtained preliminarily, and the method can be used for judging the subsequent corrosion risk. Wherein, (1) high peak ac current density: i.e. the maximum ac current density value occurring within 24 hours. (2) High frequency peak ac current density: i.e. the alternating current density value with the highest frequency of occurrence within 24 hours. (3) Average ac current density: i.e. the average value of the ac current density over 24 hours.
And S5, judging the corrosion risk according to the characteristic parameters.
As an alternative implementation of the embodiment of the present invention, the evaluation of corrosion risk according to the characteristic parameter includes: determining interference risk points; performing pipeline corrosion risk judgment on the interference risk points; a pipe interference protection scheme is generated.
An exemplary method for monitoring and analyzing the pipeline multipoint synchronization under the dynamic ac interference of the railway according to the embodiment of the present invention is described below with reference to fig. 6, but the present invention is not limited thereto:
1. collecting and investigating basic data of railways and pipelines;
2. detecting basic parameters of the pipeline;
3. monitoring the pipeline interference parameters for a long time;
4. synchronous monitoring of pipeline interference parameters;
5. analyzing the interference law of the pipeline;
6. determining interference risk points;
7. judging the corrosion risk of the pipeline;
8. evaluation and design of a pipeline interference protection scheme;
9. and (5) evaluating the pipeline interference protection effect.
Specific parameters are shown in the following table:
therefore, the method for monitoring and analyzing the multipoint synchronization of the pipeline, which is subject to the dynamic alternating current interference of the railway, adopts a mode of arranging a plurality of monitoring devices along the line to realize the multipoint synchronization monitoring, and is different from the asynchronous monitoring of a single point; meanwhile, cameras are arranged at monitoring points and used for collecting the passing time of the train, and finally the position of the train on the track at each moment is defined. The method is used for analyzing the change conditions of alternating current interference voltage and alternating current density under different interference modes (cross interference and parallel interference) of the electrified railway, different positions (positions of trains on rails) and different relative positions (distances between the trains and test points).
Meanwhile, the embodiment of the invention evaluates the corrosion risk more accurately by a data statistical analysis method for defining the dynamic alternating current interference parameters, which is different from the evaluation of steady alternating current interference. The specific method comprises the following steps: and the high-peak alternating current density, the high-frequency peak alternating current density and the average alternating current density are respectively counted, so that inaccuracy in evaluation by using the instantaneous alternating current density is effectively avoided.
The invention defines the multipoint synchronous monitoring equipment (comprising a data recorder uDL, a camera and the like), formulates a data test scheme and provides guidance for effective detection; the acquisition parameter types of the dynamic alternating current interference are defined, and the acquisition parameter types comprise pipeline parameters, environment parameters, train parameters and the like; the method for analyzing the dynamic alternating current interference data is provided, and characteristic parameters for judging the corrosion risk are formulated; the method for analyzing the railway dynamic stray current interference law through the locomotive running position, the locomotive running speed and the pipeline interference parameter distribution is provided.
Therefore, the invention collects the dynamic alternating current interference parameters by utilizing a multipoint synchronous monitoring mode, avoids the limitation of interference degree analysis caused by single-point instantaneous detection, and can more represent the interference risk of the pipeline in a complete period of one day. Through collecting a plurality of parameters such as pipeline, environment, train, etc. provide data support for follow-up interference law deep analysis, provide the help for pipeline circuit design and corrosion risk point screening simultaneously. By formulating a scientific data analysis method, the method for judging the corrosion risk of the pipeline by dynamic communication and steady state communication is effectively distinguished, so that the corrosion risk judging result is more accurate.
Fig. 7 is a schematic structural diagram of a pipeline multipoint synchronization monitoring and analyzing device with railway dynamic ac interference according to an embodiment of the present invention, where the method is applied to the pipeline multipoint synchronization monitoring and analyzing device with railway dynamic ac interference, and the structure of the pipeline multipoint synchronization monitoring and analyzing device with railway dynamic ac interference is simply described below, and other less matters are referred to the related description in the pipeline multipoint synchronization monitoring and analyzing method with railway dynamic ac interference, and referring to fig. 7, the pipeline multipoint synchronization monitoring and analyzing device with railway dynamic ac interference according to the embodiment of the present invention includes:
the acquisition module is used for acquiring parameter data, wherein the parameter data comprises: the method comprises the steps of presetting pipeline parameters in monitoring time, presetting train parameters in the monitoring time and presetting environment parameters, wherein the pipeline parameters comprise: alternating current interference voltage, alternating current density, on/off potential, environmental parameters include: soil resistivity, ground potential gradient, and corrosion rate near each test point, train parameters include: the time of occurrence of the train; the parameter data are obtained by the following steps: setting a parameter acquisition system, wherein the parameter acquisition system comprises: setting N test points at the pipeline to be monitored, wherein each test point is provided with a data recorder for monitoring alternating current interference voltage, alternating current density and on/off electric potential of the test point; m cameras are arranged at the position of the pipeline to be monitored, and the angle of each camera is perpendicular to the railway track and is used for recording the occurrence time of the train; wherein M is less than or equal to N, and M, N is a positive integer;
the calculation module is used for calculating and analyzing an interference rule, wherein the interference rule comprises: the interference rule of different test points of the train at the fixed position and the interference rule of the same test point along with the change of the distance in the running process of the train;
the determining module is used for determining characteristic parameters for corrosion risk discrimination according to the interference law, wherein the characteristic parameters comprise: high peak ac current density, high frequency peak ac current density, average ac current density;
and the judging module is used for judging the corrosion risk according to the characteristic parameters.
As an optional implementation manner of the embodiment of the present invention, n=5, m=3, and m cameras are respectively disposed at the first test point, the third test point, and the fifth test point.
As an optional implementation manner of the embodiment of the present invention, the calculation module calculates and analyzes the interference law of different test points of the train at the fixed position by the following manner: acquiring time T of train passing by first camera through camera 1 Obtaining the test points in (T 1 -Smin,T 1 And +Smin), calculating the distribution rule of the disturbance voltage and the current density of the pipeline when each test point of the train appears.
As an optional implementation manner of the embodiment of the invention, the calculation module calculates and analyzes the interference rule of the same test point along with the change of the distance in the running process of the train by the following manner: respectively calculating the speed V of the train in the first section Vehicle speed 1-3 ＝L 0 /(T 3 -T 1 ) And the vehicle speed V of the second stage Vehicle speed 3-5 ＝L 0 /(T 5 -T 3 ) Wherein T is 1 For the time of the train passing through the first camera, T 3 For the time of the train passing through the second camera, T 5 For the time of the train passing through the third camera, L 0 The distance is the vertical projection distance of two adjacent cameras on the track; comparing the speed of the first section with the speed of the second section, judging whether the train runs at a constant speed, accelerates or decelerates, and calculating the distance between each test point and the train at each moment; calculating the position of the train when the peak value occurs at the position of each test point to obtain stray current leakage of each railwayThe location of the leaks and the regularity of the leaks.
As an optional implementation manner of the embodiment of the present invention, the evaluation module performs evaluation of corrosion risk according to the characteristic parameters by: determining interference risk points; performing pipeline corrosion risk judgment on the interference risk points; a pipe interference protection scheme is generated.
Therefore, the pipeline multipoint synchronous monitoring analysis device which is subject to the railway dynamic alternating current interference provided by the embodiment of the invention adopts a mode of arranging a plurality of monitoring devices along the line to realize multipoint synchronous monitoring, which is different from the asynchronous monitoring of a single point; meanwhile, cameras are arranged at monitoring points and used for collecting the passing time of the train, and finally the position of the train on the track at each moment is defined. The method is used for analyzing the change conditions of alternating current interference voltage and alternating current density under different interference modes (cross interference and parallel interference) of the electrified railway, different positions (the positions of the trains on the rails) and different relative positions (the distances between the trains and the monitoring points).
Meanwhile, the embodiment of the invention evaluates the corrosion risk more accurately by a data statistical analysis method for defining the dynamic alternating current interference parameters, which is different from the evaluation of steady alternating current interference. The specific method comprises the following steps: and the high-peak alternating current density, the high-frequency peak alternating current density and the average alternating current density are respectively counted, so that inaccuracy in evaluation by using the instantaneous alternating current density is effectively avoided.
The invention defines the multipoint synchronous monitoring equipment (comprising a data recorder uDL, a camera and the like), formulates a data test scheme and provides guidance for effective detection; the acquisition parameter types of the dynamic alternating current interference are defined, and the acquisition parameter types comprise pipeline parameters, environment parameters, train parameters and the like; the method for analyzing the dynamic alternating current interference data is provided, and characteristic parameters for judging the corrosion risk are formulated; the method for analyzing the railway dynamic stray current interference law through the locomotive running position, the locomotive running speed and the pipeline interference parameter distribution is provided.
Therefore, the invention collects the dynamic alternating current interference parameters by utilizing a multipoint synchronous monitoring mode, avoids the limitation of interference degree analysis caused by single-point instantaneous detection, and can more represent the interference risk of the pipeline in a complete period of one day. Through collecting a plurality of parameters such as pipeline, environment, train, etc. provide data support for follow-up interference law deep analysis, provide the help for pipeline circuit design and corrosion risk point screening simultaneously. By formulating a scientific data analysis method, the method for judging the corrosion risk of the pipeline by dynamic communication and steady state communication is effectively distinguished, so that the corrosion risk judging result is more accurate.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. A pipeline multipoint synchronous monitoring analysis method interfered by railway dynamic alternating current is characterized by comprising the following steps:
setting a parameter acquisition system, wherein the parameter acquisition system comprises: setting N test points at a pipeline to be monitored, wherein each test point is provided with a data recorder for monitoring alternating current interference voltage, alternating current density and on/off electric potential of the test point; m cameras are arranged at the pipeline to be monitored, and the angle of each camera is perpendicular to the railway track and is used for recording the occurrence time of a train; wherein M is less than or equal to N, and M, N is a positive integer;
acquiring parameter data, the parameter data comprising: the method comprises the steps of presetting pipeline parameters in monitoring time, presetting train parameters in the monitoring time and presetting environment parameters, wherein the pipeline parameters comprise: the ac interference voltage, the ac current density, and the on/off potential, the environmental parameters including: soil resistivity, ground potential gradient, and corrosion rate near each of the test points, the train parameters including: the time of occurrence of the train;
calculating and analyzing an interference law, wherein the interference law comprises: the interference law of the train at the fixed position and different test points and the interference law of the same test point along with the change of the distance in the running process of the train;
determining characteristic parameters for corrosion risk discrimination according to the interference law, wherein the characteristic parameters comprise: high peak ac current density, high frequency peak ac current density and average ac current density;
and judging the corrosion risk according to the characteristic parameters.
2. The method of claim 1, wherein n=5, m=3, and the M cameras are disposed at a first test point, a third test point, and a fifth test point, respectively.
3. The method of claim 2, wherein said calculating and analyzing interference patterns of different test points of the train at the fixed location comprises:
acquiring time T of train passing by a first camera through the camera 1 Obtaining the test points in (T 1 -Smin,T 1 And +Smin), calculating the distribution rule of the disturbance voltage and the current density of the pipeline when each test point of the train appears.
4. The method according to claim 2, wherein the calculating and analyzing the interference law of the same test point with the change of the distance during the running process of the train comprises:
respectively calculating the speed V of the train in the first section Vehicle speed 1-3 ＝L 0 /(T 3 -T 1 ) And the vehicle speed V of the second stage Vehicle speed 3-5 ＝L 0 /(T 5 -T 3 ) Wherein T is 1 For the time of the train passing through the first camera, T 3 For the time of the train passing through the second camera, T 5 For the time of the train passing through the third camera, L 0 The distance is the vertical projection distance of two adjacent cameras on the track;
comparing the speed of the first section with the speed of the second section, judging whether the train runs at a constant speed, accelerates or decelerates, and calculating the distance between each test point and the train at each moment;
and calculating the position of the train when the peak value occurs at the position of each test point, and obtaining the position of the stray current leakage and the leakage rule of each railway.
5. The method of claim 1, wherein said evaluating corrosion risk based on said characteristic parameter comprises:
determining interference risk points;
performing pipeline corrosion risk judgment on the interference risk points;
a pipe interference protection scheme is generated.
6. A pipeline multipoint synchronous monitoring and analyzing device interfered by railway dynamic alternating current, which is characterized by comprising:
the acquisition module is used for acquiring parameter data, wherein the parameter data comprises: the method comprises the steps of presetting pipeline parameters in monitoring time, presetting train parameters in the monitoring time and presetting environment parameters, wherein the pipeline parameters comprise: alternating current interference voltage, alternating current density and on/off potential, the environmental parameters including: soil resistivity, ground potential gradient, and corrosion rate near each test point, the train parameters including: the time of occurrence of the train; the parameter data are obtained by the following steps: setting a parameter acquisition system, wherein the parameter acquisition system comprises: setting N test points at a pipeline to be monitored, wherein each test point is provided with a data recorder for monitoring the alternating current interference voltage, the alternating current density and the on/off electric potential of the test point; m cameras are arranged at the pipeline to be monitored, and the angle of each camera is perpendicular to a railway track and is used for recording the occurrence time of the train; wherein M is less than or equal to N, and M, N is a positive integer;
the calculation module is used for calculating and analyzing an interference rule, and the interference rule comprises: the interference law of the train at the fixed position and different test points and the interference law of the same test point along with the change of the distance in the running process of the train;
the determining module is used for determining characteristic parameters for corrosion risk discrimination according to the interference law, wherein the characteristic parameters comprise: high peak ac current density, high frequency peak ac current density and average ac current density;
and the judging module is used for judging the corrosion risk according to the characteristic parameters.
7. The apparatus of claim 6, wherein n=5, m=3, and the M cameras are disposed at a first test point, a third test point, and a fifth test point, respectively.
8. The apparatus of claim 7, wherein the calculation module calculates the interference law for analyzing different test points of the train at the fixed location by:
acquiring time T of train passing by a first camera through the camera 1 Obtaining the test points in (T 1 -Smin,T 1 And +Smin), calculating the distribution rule of the disturbance voltage and the current density of the pipeline when each test point of the train appears.
9. The apparatus of claim 7, wherein the calculation module calculates and analyzes the interference law of the same test point with the change of the distance during the running process of the train by:
respectively calculating the speed V of the train in the first section Vehicle speed 1-3 ＝L 0 /(T 3 -T 1 ) And the vehicle speed V of the second stage Vehicle speed 3-5 ＝L 0 /(T 5 -T 3 ) Wherein T is 1 For the time of the train passing through the first camera, T 3 For the time of the train passing through the second camera, T 5 For the time the train passes the third camera,L 0 the distance is the vertical projection distance of two adjacent cameras on the track; comparing the speed of the first section with the speed of the second section, judging whether the train runs at a constant speed, accelerates or decelerates, and calculating the distance between each test point and the train at each moment; and calculating the position of the train when the peak value occurs at the position of each test point, and obtaining the position of the stray current leakage and the leakage rule of each railway.
10. The apparatus of claim 6, wherein the assessment module assesses the risk of corrosion based on the characteristic parameters by: determining interference risk points; performing pipeline corrosion risk judgment on the interference risk points; a pipe interference protection scheme is generated.
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