CN112540411B - Topological positioning device and method for grounding grid - Google Patents
Topological positioning device and method for grounding grid Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/004—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points
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Abstract
The utility model provides a grounding network topology positioning device and method, positioner first sending coil, second sending coil, first receiving coil and second receiving coil, the plane that first sending coil, second sending coil and first receiving coil place is on a parallel with ground, first sending coil with second sending coil is located the both sides of first receiving coil, the plane perpendicular to ground that second receiving coil place, the centre of a circle of second receiving coil with the centre of a circle of first receiving coil is in same one side. By adopting the device, the position of the underground conductor of the grounding grid can be rapidly and accurately detected under the conditions that the transformer substation normally operates and the grounding grid is not excavated under the complex electromagnetic environment of the transformer substation, and the position of the grid topology of the grounding grid can be further determined, so that the detection requirement of actual engineering can be met.
Description
Technical Field
The application relates to the technical field of detection of a grounding grid of a power system, in particular to a topological positioning device and method of the grounding grid.
Background
The grounding grid is a grounding body of a grid formed by welding flat steel, round steel, angle steel, steel pipes or copper materials, the complete reliability of the grounding grid is necessary guarantee for safe operation of a power system, conductors forming the grounding grid are buried underground, and the conductors are broken often due to poor welding, missing welding or soil corrosion and the like in construction, so that the grounding leakage performance of the grounding grid is reduced, equipment and personal safety are threatened, huge economic loss and social influence are brought, the grounding grid belongs to underground hidden engineering, and after the backfilling working procedure of the civil construction stage is completed, the communication condition of the grounding grid and the corrosion condition of the grounding body after operation are difficult to visually check and evaluate the state, so that the grounding grid is required to be positioned to determine the corrosion condition and maintain in time.
At present, an electrical source is applied to topological positioning of a grounding grid, frequency-specific alternating current is injected into the grounding grid through a grounding downlead, and electric field or magnetic field distribution of the earth surface above the grounding grid is measured, so that the position and trend of a grounding grid conductor are positioned, and topological structure imaging of the whole grounding grid is realized.
The design and the laying drawing of the grounding grid are the precondition of searching the breakpoint and the serious corrosion section of the grounding grid and carrying out the safety performance evaluation, and in the actual engineering, the situations that the grounding grid drawing has deviation, drawing loss or defect with the actual laying are sometimes encountered, thereby bringing great difficulty to the state diagnosis and the safety performance evaluation of the grounding grid. At this time, the operation of the power system is often affected by large-area digging inspection or power failure of the transformer substation.
Disclosure of Invention
The application provides a grounding grid topology positioning device and method, which are used for solving the problem that when the topology position of a grounding grid is determined in the prior art, the operation of a power system is influenced by depending on the design and paving drawings of the grounding grid or requiring power failure of a transformer substation.
In a first aspect, the present application provides a topological positioning device for a ground network, comprising: the first transmitting coil, the second transmitting coil, the first receiving coil and the second receiving coil;
the plane where the first sending coil, the second sending coil and the first receiving coil are located is parallel to the ground, the first sending coil and the second sending coil are located on two sides of the first receiving coil, the plane where the second receiving coil is located is perpendicular to the ground, and the circle center of the second receiving coil and the circle center of the first receiving coil are located in the same plane.
Optionally, the centers of the circles of the first sending coil, the second sending coil and the first receiving coil are on the same straight line.
Optionally, the diameter of the second receiving coil parallel to the ground is perpendicular to a straight line connecting the centers of the first sending coil, the second sending coil and the first receiving coil.
In a second aspect, the present application further provides a positioning method of a topology of a ground network, where the positioning method is applied to a positioning device of the topology of the ground network, and includes:
setting a test measuring line above a grounding network to be positioned, and establishing a plurality of measuring point coordinates along the test measuring line;
the grounding grid topology positioning device performs point-by-point measurement along the measuring point coordinates of the test measuring line to obtain induced voltage data at the measuring point coordinates;
converting the induced voltage data into a magnetic field intensity value to obtain a magnetic field data plane graph, wherein the magnetic field data is the magnetic field intensity value at the measuring point coordinates;
and determining the position of the grounding grid topology according to the magnetic field data plane diagram.
Optionally, the topological positioning of the grounding network performs point-by-point measurement along a measurement point coordinate of the test measurement line, and obtains induced voltage data at the measurement point coordinate, including:
the center of the grounding grid topology positioning device is overlapped with the measuring point coordinates of a plurality of test measuring lines respectively;
the grounding grid topology positioning device generates step linear turn-off current, establishes a primary pulse magnetic field and excites the grounding grid to generate a secondary vortex field signal;
and sensing the secondary vortex field signals to obtain the sensing voltage data at the coordinates of each measuring point.
Optionally, converting the induced voltage data into a magnetic field intensity value to obtain a magnetic field data plan, including:
integrating the induced voltage data at the measuring point coordinates to obtain a magnetic field intensity value in the vertical ground direction;
and drawing the magnetic field intensity values of each measuring point in the test area in the vertical ground direction into a magnetic field data plane graph.
Optionally, the value of the magnetic field strength in the vertical ground direction is a peak value of the magnetic field strength component of the ground surface perpendicular to the direction of the conductor current.
The utility model provides a grounding network topology positioning device and method, positioner first sending coil, second sending coil, first receiving coil and second receiving coil, the plane that first sending coil, second sending coil and first receiving coil place is on a parallel with ground, first sending coil with second sending coil is located the both sides of first receiving coil, the plane perpendicular to ground that second receiving coil place, the centre of a circle of second receiving coil with the centre of a circle of first receiving coil is in same one side. By adopting the device, the position of the underground conductor of the grounding grid can be rapidly and accurately detected under the conditions that the transformer substation normally operates and the grounding grid is not excavated under the complex electromagnetic environment of the transformer substation, and the position of the grid topology of the grounding grid can be further determined, so that the detection requirement of actual engineering can be met.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a topology positioning device of a grounding network provided in the present application;
fig. 2 is a schematic flow chart of a topology positioning method of a grounding network;
FIG. 3 is a waveform diagram of a step-like linear turn-off current in a topology positioning device of a ground network according to the present application;
fig. 4 is a schematic diagram of the positions of a ground grid and test lines in the topology positioning method of the ground grid.
Wherein, 1-first transmitting coil, 2-second transmitting coil, 3-first receiving coil, 4-second receiving coil.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings of the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, the present application provides a topology positioning device of a grounding network, including: a first transmitting coil 1, a second transmitting coil 2, a first receiving coil 3 and a second receiving coil 4.
The planes of the first transmitting coil 1, the second transmitting coil 2 and the first receiving coil 3 are parallel to the ground, the first transmitting coil 1 and the second transmitting coil 2 are positioned on two sides of the first receiving coil 3, the plane of the second receiving coil 4 is perpendicular to the ground, and the circle center of the second receiving coil 4 and the circle center of the first receiving coil 3 are in the same plane.
According to the measurement result, reversely pushing the grounding grid structure according to the peak value coordinates, and drawing a grounding grid structure diagram: the distribution of the magnetic induction intensity components of the ground surface perpendicular to the current direction of the conductors has the characteristic of exhibiting wave-like change, and a peak value appears above each conductor, namely, the place where the peak value appears corresponds to the place where the conductor exists under the ground, so that the position of the conductor buried under the ground and the grid structure of the grounding grid can be judged.
The first transmitting coil 1 and the second transmitting coil 2 are respectively and electrically connected with a transmitter, the first receiving coil 3 and the second receiving coil 4 are respectively and electrically connected with a receiver, the transmitter provides step-like turn-off currents with equal amplitude and opposite directions for the first transmitting coil 1 and the second transmitting coil 2, as shown in fig. 3, the horizontal axis is a time coordinate, the vertical axis is a current coordinate, and the current is in T 1 Start turning off at the moment, at T 2 Finishing the turn-off at the moment; the receiver is used for storing a voltage signal; when the center of the topological positioning device of the grounding grid is positioned at the center of the grounding grid, the magnetic field intensity value received by the first receiving coil 3 is 0, no induction is generated at the conductor of the grounding grid, and no secondary magnetic field is generated.
When the grounding grid topological positioning device moves from the mesh center of the grounding grid to the grounding grid conductor, the first receiving coil 3 and the second receiving coil 4 induce currents in the same direction on the conductor of the grounding grid, and the current value is gradually increased until the center of the grounding grid topological positioning device is positioned right above the grounding grid conductor, the induced currents on the grounding grid conductor have peak values, the magnetic induction intensity received by the first receiving coil 3 reaches the minimum value, and the magnetic induction intensity received by the second receiving coil 4 reaches the maximum value.
The centers of the circles of the first transmitting coil 1, the second transmitting coil 2 and the first receiving coil 3 are on the same straight line.
When the center of the first receiving coil 3 is right above the grounding grid conductor, the first sending coil 1 and the second sending coil 2 are located on two sides of the grounding grid conductor and are equal to the distance between the first sending coil and the grounding grid conductor, so that the current induced by the grounding grid conductor reaches the maximum, and the second receiving coil 4 is convenient for receiving the magnetic induction intensity.
The diameter of the second receiving coil 4 parallel to the ground is perpendicular to a straight line connecting the centers of the first transmitting coil 1, the second transmitting coil 2 and the first receiving coil 3.
At this time, the plane of the second receiving coil 4 is perpendicular to the direction of the magnetic field generated by the grounding grid conductor, so that the second receiving coil 4 can receive the magnetic induction intensity.
The application provides a topological positioning device of a grounding network, a first sending coil, a second sending coil, a first receiving coil and a second receiving coil of the positioning device, the planes of the first sending coil, the second sending coil and the first receiving coil are parallel to the ground, the first sending coil and the second sending coil are positioned on two sides of the first receiving coil, the plane of the second receiving coil is perpendicular to the ground, and the circle center of the second receiving coil and the circle center of the first receiving coil are in the same plane. By adopting the device, the position of the underground conductor of the grounding grid can be rapidly and accurately detected under the conditions that the transformer substation normally operates and the grounding grid is not excavated under the complex electromagnetic environment of the transformer substation, and the position of the grid topology of the grounding grid can be further determined, so that the detection requirement of actual engineering can be met.
Referring to fig. 2, the present application provides a topology positioning method of a ground network, where the topology positioning method of the ground network includes:
and S1, setting a test line above a grounding network to be positioned, and establishing a plurality of measuring point coordinates along the test line.
Setting test lines in an area above a grounding network to be positioned, wherein the test lines comprise the lengths of the test lines and the distances between the test lines, establishing a plurality of measuring points along the test direction of the test lines, and setting the measuring point distances. Referring to fig. 4, alternatively, a plurality of parallel test lines (dashed line part in the figure) are set, and in the plurality of test lines, the distances between two adjacent test lines are equal, and the measuring point position is set uniformly on each test line, so that the position of the grounding grid conductor (solid line part in the figure) at the measuring point position is conveniently detected.
And S2, carrying out point-by-point measurement along the measuring point coordinates of the test measuring line by the grounding grid topology positioning device to obtain the induced voltage data at the measuring point coordinates.
The center of the grounding grid topological positioning device coincides with the coordinate of the measuring point, the grounding grid topological positioning device generates step-like turn-off current with equal amplitude and opposite direction, a primary pulse magnetic field is established, the grounding grid is excited to generate a secondary vortex field signal, a second receiving coil in the grounding grid topological positioning device observes the induced secondary vortex field, the induced voltage data at the coordinate of the measuring point is obtained through measurement, the induced voltage data at the coordinate of the measuring point is stored, and then the coordinate of the next measuring point is measured continuously.
And S3, converting the induced voltage data into a magnetic field intensity value to obtain a magnetic field data plane graph, wherein the magnetic field data is the magnetic field intensity value at the measuring point coordinates.
In the topological positioning device of the grounding grid, an induction coil is used as a receiving sensing device, and the response value of the induction voltage of a detection area, namely the change rate of a magnetic field along with time, is measured. And integrating the response of the induced voltage according to Faraday electromagnetic induction law to obtain a vertical magnetic field intensity value.
And S4, determining the position of the grounding grid topology according to the magnetic field data plane diagram.
Referring to fig. 1, the center of the topological positioning device of the grounding grid is taken as an origin, a straight line connecting the centers of the first transmitting coil, the second transmitting coil and the first receiving coil is taken as a y direction, a direction perpendicular to the y direction is taken as an x direction, the x direction and the y direction are parallel to the ground, the magnetic induction intensity of the ground surface is measured along the x direction and the y direction respectively, the position coordinates of the peak value are recorded, the grounding grid structure is reversely pushed according to the peak value coordinates according to the measurement result, and the grounding grid structure diagram is drawn: the distribution of the magnetic induction intensity components of the ground surface perpendicular to the current direction of the conductors has the characteristic of exhibiting wave-like change, and a peak value appears above each conductor, namely, the place where the peak value appears corresponds to the place where the conductor exists under the ground, so that the position of the conductor buried under the ground and the grid structure of the grounding grid can be judged.
The topological positioning of the grounding network performs point-by-point measurement along the measuring point coordinates of the test measuring line to obtain the induced voltage data at the measuring point coordinates, and the method comprises the following steps:
and S21, respectively overlapping the centers of the topological positioning devices of the grounding network with the measuring point coordinates of a plurality of test measuring lines.
And S22, the topological positioning device of the grounding grid generates step linear turn-off current, establishes a primary pulse magnetic field and excites the grounding grid to generate a secondary vortex field signal.
And S23, sensing the secondary vortex field signals to obtain the sensing voltage data at the coordinates of each measuring point.
Converting the induced voltage data into magnetic field intensity values to obtain a magnetic field data plane map, including:
and S41, integrating the induced voltage data at the measuring point coordinates to obtain a magnetic field intensity value in the vertical ground direction.
And S42, drawing the magnetic field intensity value of each measuring point in the test area in the vertical ground direction into a magnetic field data plane graph.
The magnetic field intensity value in the vertical ground direction is the peak value of the magnetic induction intensity component of the ground surface perpendicular to the current direction of the conductor.
The foregoing detailed description has been provided for the purposes of illustration in connection with specific embodiments and exemplary examples, but such description is not to be construed as limiting the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications and improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these all fall within the scope of the present application. The scope of the application is defined by the appended claims.
Claims (4)
1. A ground network topology positioning device, comprising: a first transmitting coil (1), a second transmitting coil (2), a first receiving coil (3) and a second receiving coil (4);
the plane where the first transmitting coil (1), the second transmitting coil (2) and the first receiving coil (3) are located is parallel to the ground, the first transmitting coil (1) and the second transmitting coil (2) are located at two sides of the first receiving coil (3), the plane where the second receiving coil (4) is located is perpendicular to the ground, the circle center of the second receiving coil (4) and the circle center of the first receiving coil (3) are located in the same plane, and the first transmitting coil (1) and the second transmitting coil (2) are used for receiving step-like turn-off currents with equal amplitude and opposite directions;
the centers of the first transmitting coil (1), the second transmitting coil (2) and the first receiving coil (3) are on the same straight line;
the diameter of the second receiving coil (4) parallel to the ground is perpendicular to a straight line connecting the centers of the first sending coil (1), the second sending coil (2) and the first receiving coil (3).
2. A positioning method of a topology of a ground network, the positioning method being applied to the positioning device of a topology of a ground network according to claim 1, comprising:
setting a test measuring line above a grounding network to be positioned, and establishing a plurality of measuring point coordinates along the test measuring line;
the center of the grounding grid topology positioning device is overlapped with the measuring point coordinates of a plurality of test measuring lines respectively;
the topological positioning device of the grounding grid generates step linear turn-off currents with equal amplitude and opposite directions, a primary pulse magnetic field is established, and the grounding grid is excited to generate a secondary vortex field signal;
sensing the secondary vortex field signals to obtain sensing voltage data at the coordinates of each measuring point;
converting the induced voltage data into a magnetic field intensity value to obtain a magnetic field data plane graph, wherein the magnetic field data is the magnetic field intensity value at the measuring point coordinates;
and determining the position of the grounding grid topology according to the magnetic field data plane diagram.
3. The method of claim 2, wherein converting the induced voltage data to magnetic field strength values to obtain a magnetic field data plan, comprises:
integrating the induced voltage data at the measuring point coordinates to obtain a magnetic field intensity value in the vertical ground direction;
and drawing the magnetic field intensity values of each measuring point in the test area in the vertical ground direction into a magnetic field data plane graph.
4. A method of topological positioning a ground network according to claim 3, wherein the value of the magnetic field strength in the vertical ground direction is the peak value of the magnetic field strength component of the ground surface perpendicular to the direction of the conductor current.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646142A (en) * | 2017-03-06 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Grounding grid broken point diagnosis method and transient electromagnetic detection device |
| CN107272074A (en) * | 2017-05-16 | 2017-10-20 | 中国矿业大学(北京) | A kind of apparatus and method for realizing Mine transient electromagnetic focusing-detection |
| CN108227015A (en) * | 2016-12-21 | 2018-06-29 | 电缆检测有限公司 | Underground communal facility mapping |
| CN211786156U (en) * | 2020-05-19 | 2020-10-27 | 天津舜捷安科技有限公司 | Magnetic field focusing type buried metal pipeline probe device based on transient electromagnetic method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004047188B4 (en) * | 2004-09-29 | 2022-10-27 | Robert Bosch Gmbh | Device for locating metallic objects |
| IL180334A (en) * | 2006-12-26 | 2014-03-31 | Elta Systems Ltd | Method and system for monitoring an underground electric cable |
| CN103792461B (en) * | 2013-11-21 | 2016-08-17 | 国家电网公司 | A kind of grounded screen breaking point diagnosis method of transient electromagnetic method |
-
2020
- 2020-11-06 CN CN202011226938.7A patent/CN112540411B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108227015A (en) * | 2016-12-21 | 2018-06-29 | 电缆检测有限公司 | Underground communal facility mapping |
| CN106646142A (en) * | 2017-03-06 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Grounding grid broken point diagnosis method and transient electromagnetic detection device |
| CN107272074A (en) * | 2017-05-16 | 2017-10-20 | 中国矿业大学(北京) | A kind of apparatus and method for realizing Mine transient electromagnetic focusing-detection |
| CN211786156U (en) * | 2020-05-19 | 2020-10-27 | 天津舜捷安科技有限公司 | Magnetic field focusing type buried metal pipeline probe device based on transient electromagnetic method |
Non-Patent Citations (3)
| Title |
|---|
| Topological measurement and characterization of substation grounding grids based on derivative method;Li Chunli 等;《Electrical Power and Energy Systems》;第158-164页 * |
| 一种基于电磁法的接地网断点诊断方法;沈鑫 等;昆明理工大学学报(自然科学版);第43卷(第1期);第50-54页 * |
| 基于磁性源的接地网拓扑结构检测方法研究;李波 等;《云南电力技术》;第48卷(第5期);第2-5页 * |
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