DC stray current interference detection device, system and detection method

Abstract

A DC stray current interference detection device includes a data recorder and a reference electrode, wherein the reference electrode includes a first reference electrode, a second reference electrode and a central reference electrode. A DC stray current interference detection method includes the following steps: 1. electrode layout; 2. data acquisition; 3. data processing; 4. vector synthesis. The DC stray current interference detection device forms a simplified crosshair through three reference electrodes arranged at right angles, so that the potential gradient in two directions perpendicular to each other can be measured, which is convenient for vector synthesis of the potential gradient to obtain the potential gradient and direction of the stray current. This not only realizes the detection of the stray current, but also simplifies the device structure, reduces the number of reference electrodes used, and collects and processes the potential data through the data recorder. Compared with manual degrees, the measurement data can be obtained more accurately, so that the spacing between the reference electrodes does not need to meet specific requirements, reducing the difficulty of laying out the reference electrodes.

Description

Technical Field

[0001] The present invention belongs to the technical field of DC interference protection for buried pipelines, and in particular relates to a DC stray current interference detection device, a DC stray current interference source detection system, and a DC stray current interference and DC stray current interference source detection method. Background Art

[0002] At present, the number of power transmission and distribution lines is gradually increasing, and electrified railways, subways and other rail transit lines are developing rapidly, which has greatly increased the level of stray current in the earth and caused serious electrochemical corrosion to buried metal pipelines.

[0003] Only by detecting the stray current in the soil around the buried metal pipeline can the interference intensity of the stray current be analyzed, the source of the interference can be found, and the impact of the stray current on the buried metal pipeline can be effectively reduced or eliminated.

[0004] At present, a common method for analyzing DC stray current interference is to analyze the intensity and source of stray current interference by measuring the DC potential gradient on the ground. The current standard uses the cross-line method to measure the DC potential gradient. This measurement method requires the placement of four identical reference electrodes on the ground at an appropriate location near the pipeline. The four reference electrodes are divided into two groups, each with two reference electrodes. One group should be placed parallel to the pipeline, and the other group should be placed perpendicular to the pipeline. The distance between the two reference electrodes in each group should not be less than 20m. The electrode spacing between the two groups of reference electrodes should be the same, and the two groups of reference electrodes should be symmetrically cross-distributed. Two DC voltmeters are also required, and each DC voltmeter is connected to two reference electrodes in the same group.

[0005] Since the cross-line method is used to measure the DC potential gradient, the equipment needs to be laid out in the above manner, which has high requirements for layout, cumbersome operation, and extremely inconvenient measurement. In addition, this method uses a DC voltmeter, which requires manual reading and then data analysis. The measurement accuracy and efficiency are not high, and the dynamic DC stray current interference caused by subways, etc. cannot be analyzed in a timely and accurate manner. Summary of the invention

[0006] In view of the technical problems of the above-mentioned existing measurement methods, such as high equipment layout requirements, complicated operation, low accuracy and low measurement efficiency, the present invention proposes a DC stray current interference detection device, system and detection method.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A DC stray current interference detection device comprises a data recorder and a reference electrode, wherein the reference electrode comprises a first reference electrode, a second reference electrode and a central reference electrode;

[0009] The first reference electrode, the second reference electrode and the central reference electrode are all electrically connected to the data recorder via wires;

[0010] The line between the first reference electrode and the central reference electrode is perpendicular to the line between the second reference electrode and the central reference electrode.

[0011] Preferably, the data recorder is provided with an electronic compass.

[0012] A DC stray current interference source detection system comprises an analysis terminal and the above-mentioned DC stray current interference detection device, wherein at least two DC stray current interference detection devices are provided and are both electrically connected to the analysis terminal through wires.

[0013] Preferably, the data recorder in the DC stray current interference detection device is provided with a satellite clock synchronizer and a satellite locator.

[0014] A method for detecting DC stray current interference, using the above-mentioned DC stray current interference detection device, the steps are as follows:

[0015] Electrode layout:

[0016] Ground the first reference electrode, the second reference electrode and the central reference electrode, and make the connection line between the first reference electrode and the central reference electrode perpendicular to the layout direction of the pipeline;

[0017] Data collection:

[0018] The first reference electrode, the second reference electrode and the central reference electrode all detect the ground surface at the corresponding position, and measure the first potential difference V A and the second potential difference V B and send it to the data recorder; the first potential difference V A is the potential difference between the first reference electrode and the central reference electrode, the second potential difference V B is the potential difference between the second reference electrode and the central reference electrode;

[0019] Measure the distance k1 between the first reference electrode and the central reference electrode and the distance k2 between the second reference electrode and the central reference electrode, and input k1 and k2 into the data recorder through a keyboard provided in the data recorder;

[0020] Data processing:

[0021] The data recorder calculates the first potential gradient V V and the second potential gradient V P ,

[0022] Vector synthesis:

[0023] The data recorder sets the first potential gradient V V and the second potential gradient V P According to the Pythagorean theorem, vector synthesis is performed to obtain the stray current potential gradient P G And a first angle α1 relative to the line between the first reference electrode and the central reference electrode.

[0024] Preferably, the electrode arrangement is replaced by:

[0025] grounding the first reference electrode, the second reference electrode, and the center reference electrode;

[0026] The data collection step further comprises:

[0027] The angle β between the first reference electrode and the central reference electrode relative to the true north direction is measured by an electronic compass and sent to a data recorder;

[0028] When the line between the first reference electrode and the central reference electrode is located on the west side of the meridian, the angle β is a negative angle, and when the line between the first reference electrode and the central reference electrode is located on the east side of the meridian, the angle β is a positive angle;

[0029] The vector synthesis step further comprises:

[0030] The data logger calculates the stray current potential gradient P G The angle α relative to the true north direction is α=α1+β.

[0031] A method for detecting a DC stray current interference source adopts the above-mentioned DC stray current interference source detection system, and the steps are as follows:

[0032] Equipment layout:

[0033] The DC stray current interference detection devices are arranged at multiple positions respectively, the first reference electrode, the second reference electrode and the central reference electrode of each DC stray current interference detection device are grounded, and the connection line between the first reference electrode and the central reference electrode is perpendicular to the arrangement direction of the pipeline;

[0034] Data collection:

[0035] The data recorders of each DC stray current interference detection device synchronously collect data through the connected satellite clock synchronizer; during data collection, the data recorder of each DC stray current interference detection device detects the surface of the corresponding position through the first reference electrode, the second reference electrode and the central reference electrode, and measures multiple groups of first potential differences V at the same time. A and the second potential difference V Band send it to the data recorder; measure the distance k1 between the first reference electrode and the central reference electrode of each DC stray current interference detection device and the distance k2 between the second reference electrode and the central reference electrode, and input k1 and k2 into the data recorder through the keyboard set in the data recorder; the data recorder of each DC stray current interference detection device measures the current location of the DC stray current interference detection device through the connected satellite locator, and uploads the location information to the analysis terminal;

[0036] Data processing:

[0037] Each data recorder of the DC stray current interference detection device records multiple sets of first potential gradients V at the same time. V and the second potential gradient V P Calculation of

[0038] Vector synthesis:

[0039] The data recorder of each DC stray current interference detection device records the first potential gradient V at the same time. V and the second potential gradient V P According to the Pythagorean theorem, vector synthesis is performed to obtain the stray current potential gradient P at the same time. G and a first angle α1 thereof relative to a line connecting the first reference electrode and the central reference electrode, and uploaded to the analysis terminal;

[0040] Interference source acquisition:

[0041] The analysis terminal establishes a map, marks the location of each DC stray current interference detection device on the map according to the location information, marks the layout of the pipeline on the map according to the pipeline layout information, and calculates the stray current potential gradient P at the same time. G Mark the position of the corresponding DC stray current interference detection device according to the layout of the pipeline and the corresponding first angle α1;

[0042] Calculate the stray current potential gradient P at the same time G The location of the intersection of on the map, to obtain the location information of the interference source at that moment;

[0043] The location information of interference sources at multiple times is collected to obtain the dynamic trajectory of the interference sources.

[0044] Preferably, the equipment deployment step is replaced by:

[0045] The DC stray current interference detection devices are arranged at multiple positions respectively, and the first reference electrode, the second reference electrode and the central reference electrode of each DC stray current interference detection device are grounded;

[0046] The data collection step further comprises:

[0047] Each DC stray current interference detection device measures the angle β of the line between the first reference electrode and the central reference electrode relative to the true north direction through an electronic compass, and sends it to the data recorder;

[0048] When the line between the first reference electrode and the central reference electrode is located on the west side of the meridian, the angle β is a negative angle, and when the line between the first reference electrode and the central reference electrode is located on the east side of the meridian, the angle β is a positive angle;

[0049] The vector synthesis step further comprises:

[0050] The data recorder of each DC stray current interference detection device calculates the stray current potential gradient P G The direction angle α relative to the meridian is α=α1+β, and the direction angle α is uploaded to the analysis terminal;

[0051] The interference source acquisition step is replaced by:

[0052] The analysis terminal establishes a map, marks the location of each DC stray current interference detection device on the map according to the location information, and calculates the stray current potential gradient P at the same time. G Mark the position of the corresponding DC stray current interference detection device according to the direction angle α;

[0053] Calculate the stray current potential gradient P at the same time G The location of the intersection of on the map, to obtain the location information of the interference source at that moment;

[0054] The location information of interference sources at multiple times is collected to obtain the dynamic trajectory of the interference sources.

[0055] Compared with the prior art, the advantages and positive effects of the present invention are:

[0056] 1. The DC stray current interference detection device forms a simplified cross line through three reference electrodes arranged at right angles, so that the potential gradient in two directions perpendicular to each other can be measured, which is convenient for vector synthesis of the potential gradient and obtains the potential gradient and direction of the stray current. It not only realizes the detection of stray current, but also simplifies the equipment structure and reduces the number of reference electrodes used. In addition, the potential data is collected and processed by the data recorder. Compared with manual reading, the measurement data can be obtained more accurately, so that the spacing between the reference electrodes does not need to meet specific requirements, reducing the difficulty of laying out the reference electrodes.

[0057] 2. The electronic compass can be used to measure the direction of the line between the reference electrodes, thereby obtaining the accurate direction of the stray current. The reference electrode does not need to be set parallel or vertically relative to the pipeline, which improves the freedom of reference electrode layout.

[0058] 3. By setting up a satellite clock synchronizer and a satellite locator, multiple DC stray current interference detection devices can synchronously detect stray currents and locate the measurement position when forming a DC stray current interference source detection system through analysis terminals, thereby accurately obtaining the location of the interference source. Further, by combining the location information of the interference source at multiple times, the dynamic trajectory of the interference source can also be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 Schematic diagram of using the DC stray current interference detection device of the present invention to detect DC stray current Figure 1 ;

[0060] Figure 2 Schematic diagram of using the DC stray current interference detection device of the present invention to detect DC stray current Figure 2 ;

[0061] Figure 3 Schematic diagram of interference source detection using the DC stray current interference source detection system of the present invention Figure 1 ;

[0062] Figure 4 Schematic diagram of interference source detection using the DC stray current interference source detection system of the present invention Figure 2 ;

[0063] In the above figures: 1. data recorder; 11. electronic compass; 12. satellite clock synchronizer; 13. satellite locator; 21. first reference electrode; 22. second reference electrode; 23. central reference electrode; 3. analysis terminal; 4. pipeline. DETAILED DESCRIPTION

[0064] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0065] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inside", "outside", "upper", "lower", "front", "rear", etc. are based on the positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0066] like Figures 1 to 2 As shown, the present invention provides a DC stray current interference detection device for detecting the current gradient of the surface DC stray current around the buried pipeline 4, so as to analyze the interference intensity and interference source of the DC stray current of the earth.

[0067] The DC stray current interference detection device comprises a data recorder 1 and a reference electrode.

[0068] The reference electrodes include a first reference electrode 21 , a second reference electrode 22 and a central reference electrode 23 .

[0069] The first reference electrode 21, the second reference electrode 22 and the central reference electrode 23 are all electrically connected to the data recorder 1 through wires, so that when grounded, the detected surface potential difference is sent to the data recorder 1, so that the data recorder 1 processes and stores the potential difference information.

[0070] The line between the first reference electrode 21 and the central reference electrode 23 is used as the first line, and the line between the second reference electrode 22 and the central reference electrode 23 is used as the second line. The first line and the second line are perpendicular to each other, so that the two lines form a rectangular coordinate system. When the potential difference is detected in two directions perpendicular to each other, the same central reference electrode 23 is shared. Compared with the cross line method, the number of reference electrodes used is reduced.

[0071] like Figure 1 As shown, when the DC stray current interference detection device performs DC stray current potential detection, electrodes are arranged on the ground on one side above the pipeline 4, the first reference electrode 21, the second reference electrode 22 and the center reference electrode 23 are grounded, and the first connecting line is perpendicular to the laying direction of the pipeline 4, so that the second connecting line is parallel to the laying direction of the pipeline 4.

[0072] Data collection is performed, the reference electrode detects the surface potential difference, and the distance between the reference electrodes is measured.

[0073] The first reference electrode 21, the second reference electrode 22 and the central reference electrode 23 synchronously detect the corresponding grounding position and measure the first potential difference V A and the second potential difference VB And send it to data logger 1.

[0074] The first potential difference V A is the potential difference between the first reference electrode 21 and the central reference electrode 23, and the second potential difference V B is the potential difference between the second reference electrode 22 and the central reference electrode 23.

[0075] The distance k1 between the first reference electrode 21 and the central reference electrode 23 and the distance k2 between the second reference electrode 22 and the central reference electrode 23 are measured. The data recorder 1 is provided with a keyboard as a human-machine interface, and k1 and k2 are input through the keyboard and stored in the data recorder 1.

[0076] The data recorder 1 measures the first potential difference V A and the second potential difference V B , calculate the first potential gradient V at the same time V and the second potential gradient V P ,

[0077] Due to the first potential gradient V V and the second potential gradient V P Perpendicular to each other, the data recorder uses the Pythagorean theorem to calculate the first potential gradient V at the same time. V and the second potential gradient V P Perform vector synthesis to obtain the stray current potential gradient P at the corresponding moment G At the same time, the stray current potential gradient P at this moment is obtained G The first angle α1 between the first connecting line and the stray current potential gradient P G The second included angle between the second connecting line is 90°-α1.

[0078] According to the stray current potential gradient P G The vector length of α1 can be used to know the potential gradient of the DC stray current at that moment, so as to analyze the interference intensity. According to the first angle α1, the deflection angle of the stray current relative to the pipeline at that moment can be known, and then according to the layout angle of the pipeline, the direction of the stray current can be known, and the source of the stray current interference can be analyzed.

[0079] In order to increase the degree of freedom in arranging the reference electrode, the data logger 1 is provided with an electronic compass 11 .

[0080] like Figure 2 As shown, after the data recorder 1 is provided with the electronic compass 11, when laying out the electrodes, it is only necessary to ground the first reference electrode 21, the second reference electrode 22 and the center reference electrode 23, without considering the angle between the first connection line and the pipeline laying direction.

[0081] When data is collected, the angle β of the first connecting line relative to the true north direction is measured by the electronic compass 11 and sent to the data recorder 1 .

[0082] When the first connecting line between the first reference electrode 21 and the central reference electrode 23 is located on the west side of the meridian, the angle β is a negative angle, that is, a negative value. When the first connecting line between the first reference electrode 21 and the central reference electrode 23 is located on the east side of the meridian, the angle β is a positive angle, that is, a positive value. The meridian is the meridian, and the connecting line between the due south and due north on the compass indicates the north-south direction.

[0083] When performing vector synthesis, the data recorder 1 calculates the stray current potential gradient P G The angle α relative to the true north direction is α=α1+β, so the stray current potential gradient P at this moment can be obtained. G The angle α offset relative to the true north direction can directly obtain the accurate direction of the stray current, without the need to determine the direction of the stray current through the pipeline layout direction, making the reference electrode grounding layout more free and improving the flexibility of equipment use.

[0084] like Figures 3 to 4 As shown, the present invention provides a DC stray current interference source detection system, comprising an analysis terminal 3 and the above-mentioned DC stray current interference detection device. At least two DC stray current interference detection devices are provided in the DC stray current interference source detection system, and the data recorder 1 of each DC stray current interference detection device is communicatively connected with the analysis terminal 3.

[0085] The communication connection between the data recorder 1 and the analysis terminal 3 can be wired or wireless for real-time transmission; or after detecting and recording data, the data can be connected to the analysis terminal 3 to upload the data for analysis and processing by the analysis terminal 3.

[0086] In order to achieve synchronous detection and locate each DC stray current interference detection device, the data recorder 1 in the DC stray current interference detection device is provided with a satellite clock synchronizer 12 and a satellite positioner 13

[0087] like Figure 3 As shown, when the DC stray current interference source detection system performs dynamic interference source detection, multiple detection positions are set, equipment is arranged, and a DC stray current interference detection device is set at each detection position.

[0088] The first reference electrode 21 , the second reference electrode 22 and the central reference electrode 23 in each DC stray current interference detection device are grounded, and the first connecting line is perpendicular to the layout direction of the pipeline 4 , so that the second connecting line is parallel to the layout direction of the pipeline 4 .

[0089] To collect data, the data recorder 1 of each DC stray current interference detection device detects the surface potential difference through the reference electrode, measures the distance between the reference electrodes in each DC stray current interference detection device, and locates the detection position of each DC stray current interference detection device.

[0090] During data collection, the data recorders 1 in each DC stray current interference detection device are all operated synchronously through the connected satellite clock synchronizer 12, so as to synchronously collect data through the reference electrode and record the time information during data collection.

[0091] When each DC stray current interference detection device performs data acquisition, the data recorder 1 synchronously detects the surface of the corresponding position through the first reference electrode 21, the second reference electrode 22 and the central reference electrode 23, and measures multiple groups of first potential differences V at the same time. A and the second potential difference V B , and sends it to data logger 1.

[0092] The distance k1 between the first reference electrode 21 and the central reference electrode 23 and the distance k2 between the second reference electrode 22 and the central reference electrode 23 of each DC stray current interference detection device are measured, and k1 and k2 are input into the data recorder 1 through the keyboard.

[0093] The data recorder 1 of each DC stray current interference detection device measures its current detection position through the connected satellite locator 13 , and uploads the position information of the detection position to the analysis terminal 3 .

[0094] The data recorder 1 of each DC stray current interference detection device further processes the data according to the first potential difference V measured at the same time of the plurality of groups. A and the second potential difference V B , calculate multiple groups of first potential gradients V at the same time V and the second potential gradient V P ,

[0095] Perform vector synthesis, and each data recorder 1 of the DC stray current interference detection device records the first potential gradient V at the same time. V and the second potential gradient V P According to the Pythagorean theorem, vector synthesis is performed to obtain the stray current potential gradient P at this moment. G At the same time, the stray current potential gradient P at this moment is obtained G The first angle α1 between the first connecting line and the stray current potential gradient P at this moment G and the first included angle α1 are uploaded to the analysis terminal 3 .

[0096] Each DC stray current interference detection device will obtain multiple stray current potential gradients P at the same time. G and the corresponding first angle α1 are uploaded to the analysis terminal 3 .

[0097] The interference source is acquired, and the analysis terminal 3 creates a map and marks each detection position on the map according to the received position information. The pipeline 4 layout information is uploaded to the analysis terminal 3, and the analysis terminal 3 marks the route of the pipeline 4 on the map according to the pipeline 4 layout information, that is, the layout trajectory of the pipeline 4 and the angle of each position of the pipeline 4 relative to the true north direction can be shown on the map. The analysis terminal 3 marks the stray current potential gradient P obtained by the DC stray current interference detection device at the same time at each detection position. G , and according to the first angle α1 and the angle of the pipeline 4 relative to the meridian, the stray current potential gradient P at this moment is set G direction.

[0098] Analysis terminal 3 calculates the potential gradient P of each stray current at the same time G The location of the intersection of the two points on the map can be used to obtain the location information of the interference source at that moment.

[0099] According to the above method, the analysis terminal 3 can obtain the position of an interference source at one moment. The DC stray current interference source detection system aggregates the interference source position information at multiple moments to obtain a continuous interference source position trajectory, thereby being able to analyze the dynamic situation of the interference source.

[0100] like Figure 4 As shown, when the data recorder 1 is provided with an electronic compass 11, the process of interference source detection by the dynamic interference source detection system can be simplified.

[0101] When laying out the equipment, after each DC stray current interference detection device is laid out at the corresponding measurement position, it is only necessary to ground the first reference electrode 21, the second reference electrode 22 and the center reference electrode 23, without considering the angle between the first connecting line and the laying direction of the pipeline 4.

[0102] When collecting data, each DC stray current interference detection device measures the angle β of its first connecting line relative to the true north direction through the electronic compass 11, and sends it to the data recorder 1. When the first connecting line between the first reference electrode 21 and the central reference electrode 23 is located on the west side of the meridian, the angle β is a negative angle, that is, a negative value. When the first connecting line between the first reference electrode 21 and the central reference electrode 23 is located on the east side of the meridian, the angle β is a positive angle, that is, a positive value.

[0103] When performing vector synthesis, the data recorder 1 of each DC stray current interference detection device calculates the stray current potential gradient P at that moment.G The angle α relative to the true north direction is α=α1+β, so the stray current potential gradient P at this moment can be obtained. G The data recorder 1 uploads the direction angle α to the analysis terminal 3.

[0104] When acquiring interference sources, the stray current potential gradients P at the same time are calculated according to the direction angle α. G Mark the position of the corresponding DC stray current interference detection device, and directly set the stray current potential gradient P G The accurate direction of the pipeline does not need to be calculated based on the first angle α1 and the angle of the pipeline relative to the meridian, which improves the stray current potential gradient P G The accuracy of the calibration on the map is that the reference electrode of each DC stray current interference detection device can be freely arranged, independent of the pipeline layout direction, and will not increase the stray current potential gradient P G Difficulty in determining direction.

Claims

1. A DC stray current interference detection method, using a DC stray current interference detection device, characterized in that: The DC stray current interference detection device comprises a data recorder and a reference electrode, wherein the reference electrode comprises a first reference electrode, a second reference electrode and a central reference electrode; The first reference electrode, the second reference electrode and the central reference electrode are all electrically connected to the data recorder via wires; The line between the first reference electrode and the central reference electrode is perpendicular to the line between the second reference electrode and the central reference electrode; The data recorder is provided with an electronic compass; The specific steps of the detection method are as follows: Electrode layout: grounding the first reference electrode, the second reference electrode, and the center reference electrode; Data collection: The first reference electrode, the second reference electrode and the central reference electrode all detect the ground surface at the corresponding position, and measure the first potential difference V A and the second potential difference V B and send it to the data recorder; the first potential difference V A is the potential difference between the first reference electrode and the central reference electrode, the second potential difference V B is the potential difference between the second reference electrode and the central reference electrode; Measure the distance k1 between the first reference electrode and the central reference electrode and the distance k2 between the second reference electrode and the central reference electrode, and input k1 and k2 into the data recorder through a keyboard provided in the data recorder; The angle β between the first reference electrode and the central reference electrode relative to the true north direction is measured by an electronic compass and sent to a data recorder; When the line between the first reference electrode and the central reference electrode is located on the west side of the meridian, the angle β is a negative angle, and when the line between the first reference electrode and the central reference electrode is located on the east side of the meridian, the angle β is a positive angle; Data processing: The data recorder calculates the first potential gradient V V and the second potential gradient V P , Vector synthesis: The data recorder sets the first potential gradient V V and the second potential gradient V P According to the Pythagorean theorem, vector synthesis is performed to obtain the stray current potential gradient P G and its first angle α1 relative to the line between the first reference electrode and the central reference electrode, the data recorder calculates the stray current potential gradient P G The angle α relative to the true north direction is α=α1+β.

2. A DC stray current interference source detection method, using a DC stray current interference source detection system, characterized in that: The DC stray current interference source detection system comprises an analysis terminal and a DC stray current interference detection device, wherein at least two DC stray current interference detection devices are provided and are both communicatively connected to the analysis terminal; The DC stray current interference detection device comprises a data recorder and a reference electrode, wherein the reference electrode comprises a first reference electrode, a second reference electrode and a central reference electrode; The first reference electrode, the second reference electrode and the central reference electrode are all electrically connected to the data recorder via wires; The line between the first reference electrode and the central reference electrode is perpendicular to the line between the second reference electrode and the central reference electrode; The data recorder in the DC stray current interference detection device is provided with a satellite clock synchronizer and a satellite locator; The specific steps of the detection method are as follows: Equipment layout: The DC stray current interference detection devices are arranged at multiple positions respectively, the first reference electrode, the second reference electrode and the central reference electrode of each DC stray current interference detection device are grounded, and the connection line between the first reference electrode and the central reference electrode is perpendicular to the arrangement direction of the pipeline; Data collection: The data recorders of each DC stray current interference detection device synchronously collect data through the connected satellite clock synchronizer; during data collection, the data recorder of each DC stray current interference detection device detects the surface of the corresponding position through the first reference electrode, the second reference electrode and the central reference electrode, and measures multiple groups of first potential differences V at the same time. A and the second potential difference V B and send it to the data recorder; measure the distance k1 between the first reference electrode and the central reference electrode of each DC stray current interference detection device and the distance k2 between the second reference electrode and the central reference electrode, and input k1 and k2 into the data recorder through the keyboard set in the data recorder; the data recorder of each DC stray current interference detection device measures the current location of the DC stray current interference detection device through the connected satellite locator, and uploads the location information to the analysis terminal; Data processing: Each data recorder of the DC stray current interference detection device records multiple sets of first potential gradients V at the same time. V and the second potential gradient V P Calculation of Vector synthesis: The data recorder of each DC stray current interference detection device records the first potential gradient V at the same time. V and the second potential gradient V P According to the Pythagorean theorem, vector synthesis is performed to obtain the stray current potential gradient P at the same time. G and a first angle α1 thereof relative to a line connecting the first reference electrode and the central reference electrode, and uploaded to the analysis terminal; Interference source acquisition: The analysis terminal establishes a map, marks the location of each DC stray current interference detection device on the map according to the location information, marks the layout of the pipeline on the map according to the pipeline layout information, and calculates the stray current potential gradient P at the same time. G Mark the position of the corresponding DC stray current interference detection device according to the layout of the pipeline and the corresponding first angle α1; Calculate the stray current potential gradient P at the same time G The location of the intersection of on the map, to obtain the location information of the interference source at that moment; The location information of interference sources at multiple times is collected to obtain the dynamic trajectory of the interference sources.

3. The method for detecting a DC stray current interference source according to claim 2, characterized in that: The equipment deployment steps are replaced by: The DC stray current interference detection devices are arranged at multiple positions respectively, and the first reference electrode, the second reference electrode and the central reference electrode of each DC stray current interference detection device are grounded; The data collection step further comprises: Each DC stray current interference detection device measures the angle β of the line between the first reference electrode and the central reference electrode relative to the true north direction through an electronic compass, and sends it to the data recorder; When the line between the first reference electrode and the central reference electrode is located on the west side of the meridian, the angle β is a negative angle, and when the line between the first reference electrode and the central reference electrode is located on the east side of the meridian, the angle β is a positive angle; The vector synthesis step further comprises: The data recorder of each DC stray current interference detection device calculates the stray current potential gradient P G The direction angle α relative to the meridian is α=α1+β, and the direction angle α is uploaded to the analysis terminal; The interference source acquisition step is replaced by: The analysis terminal establishes a map, marks the location of each DC stray current interference detection device on the map according to the location information, and calculates the stray current potential gradient P at the same time. G Mark the position of the corresponding DC stray current interference detection device according to the direction angle α; Calculate the stray current potential gradient P at the same time G The location of the intersection of on the map, to obtain the location information of the interference source at that moment; The location information of interference sources at multiple times is collected to obtain the dynamic trajectory of the interference sources.

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