CN111289841A - Method and system for detecting and positioning corrosion of grounding grid - Google Patents
Method and system for detecting and positioning corrosion of grounding grid Download PDFInfo
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- CN111289841A CN111289841A CN202010207153.9A CN202010207153A CN111289841A CN 111289841 A CN111289841 A CN 111289841A CN 202010207153 A CN202010207153 A CN 202010207153A CN 111289841 A CN111289841 A CN 111289841A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
Abstract
The application discloses a method for detecting and positioning corrosion of a grounding grid, which comprises the following steps: the RTK mobile station acquires coordinate data of the measuring point, and the transient electromagnetic device synchronously acquires induced voltage data of the measuring point. And the host receives the coordinate data and the induced voltage data and records the time of generating the coordinate data and the time of generating the induced voltage data. And performing data processing on the coordinate data and the induced voltage data through time correlation to generate measuring point data. And performing inversion imaging on the measuring point data to obtain the grounding grid fault and corrosion degree conditions in the detection area. According to the method, a high-precision differential positioning system is structurally combined, the coordinate data are measured while the induced voltage data are measured, and the construction efficiency of corrosion diagnosis of the transient electromagnetic grounding network is improved. Meanwhile, corresponding parameters can be adjusted according to different sizes of grids of the grounding grid and different precision requirements in the data processing process, and the precision of positioning corrosion points of the grounding grid is improved.
Description
Technical Field
The application relates to the technical field of grounding grid corrosion detection, in particular to a grounding grid corrosion detection positioning method and system.
Background
The grounding grid is an important component of an electric power system, is a main current leakage channel of fault current and lightning strike current of electrical equipment, and the performance of the grounding grid directly influences the normal operation of the electric power system and the personal safety of workers. The grounding grid material is mostly flat steel, belongs to corrosive metal material, and the grounding grid is very easy to corrode or even break in a dark and humid electromagnetic environment for a long time, and particularly in areas such as rainy and saline-alkali lands, the corrosion problem of the grounding grid is very serious, which brings serious hidden trouble for the normal operation of a power system. With the development of economy and the continuous improvement of voltage grades, the position of a grounding grid in a transformer substation is more and more important. The detection of the state of the grounding grid and the evaluation of the safety performance become problems which need to be solved urgently in China.
The transient electromagnetic method is a geophysical method, and is characterized by that it utilizes a transmitting loop to create a primary pulse magnetic field in the underground, and utilizes a receiving coil to observe secondary vortex field in the interval period of primary field, and utilizes inversion process to form longitudinal resistivity profile.
The application of the transient electromagnetic method to the grounding grid corrosion diagnosis is firstly proposed in 2014, and the traditional transient electromagnetic method mostly adopts a GPS to fix a point in advance during geological survey construction and then carries out data acquisition at the fixed point. However, because the grid spacing of the grounding grid of the transformer substation is small, the general GPS positioning accuracy cannot meet the accuracy requirement, and the positioning accuracy of the corrosion point of the grounding grid is low.
Disclosure of Invention
The application provides a method for detecting and positioning corrosion of a grounding grid, which aims to solve the technical problem of low positioning precision of corrosion points of the grounding grid.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the embodiment of the application discloses a method for detecting and positioning corrosion of a grounding grid, which comprises the following steps: the RTK mobile station collects coordinate data of a measuring point and transmits the coordinate data to the host;
the method comprises the steps that a transient electromagnetic device collects induced voltage data of a measuring point and transmits the induced voltage data to a host, wherein a sensor of the transient electromagnetic device is fixedly connected with an RTK mobile station;
the host receives the coordinate data and the induced voltage data and records the time of generating the coordinate data and the time of generating the induced voltage data;
performing data processing on the coordinate data and the induced voltage data through time correlation between the time when the coordinate data are generated and the time when the induced voltage data are generated to generate measuring point data;
and performing inversion imaging on the measuring point data to obtain the grounding grid fault and corrosion degree conditions in the detection area.
Optionally, the processing the coordinate data and the induced voltage data to generate measuring point data includes:
the coordinate data and the induction voltage data are processed
Presetting a rectangular data area, wherein the data area contains all coordinate data;
subdividing the rectangular data area to generate a plurality of square grids;
superposing signal data corresponding to the coordinate data points in the grids to obtain measuring point data of the grids;
and selecting the central position coordinates of the grid as the position coordinates of the measuring point data.
Optionally, the method further includes: and whitening the area outside the rectangular data area.
Compared with the prior art, the beneficial effect of this application is:
the application discloses a method for detecting and positioning corrosion of a grounding grid, which comprises the following steps: the RTK rover station collects coordinate data of the measuring points and transmits the coordinate data to the host computer. The transient electromagnetic device collects induced voltage data of a measuring point and transmits the induced voltage data to the host, wherein a sensor of the transient electromagnetic device is fixedly connected with the RTK mobile station and has consistent coordinates. And the host receives the coordinate data and the induced voltage data and records the time of generating the coordinate data and the time of generating the induced voltage data. And performing data processing on the coordinate data and the induced voltage data through time correlation between the time when the coordinate data are generated and the time when the induced voltage data are generated to generate measuring point data. And performing inversion imaging on the measuring point data to obtain the grounding grid fault and corrosion degree conditions in the detection area. According to the method, a high-precision differential positioning system is structurally combined, the coordinate data are measured while the induced voltage data are measured, and the construction efficiency of corrosion diagnosis of the transient electromagnetic grounding network is improved. Meanwhile, compared with the traditional single-point measurement mode, corresponding parameters can be adjusted according to different sizes of grounding grid meshes and different precision requirements in the data processing process, and the precision of positioning the corrosion points of the grounding grid is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for detecting and positioning corrosion of a ground grid according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating an embodiment of S400 shown in fig. 1.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present application provides a method for detecting and positioning corrosion of a ground grid, including:
s100: an RTK (Real-time kinematic) mobile station collects coordinate data of a measuring point and transmits the coordinate data to a host. The RTK base station can be arranged at any position, signals are transmitted between the RTK base station and the RTK mobile station through radio, the effective communication distance can reach more than 10KM, the positioning accuracy of the RTK differential positioning system can reach centimeter level, and the requirement of the accuracy of the corrosion detection of the earth network is met.
S200: the transient electromagnetic device collects induced voltage data of a measuring point and transmits the induced voltage data to a host, wherein the RTK mobile station is arranged at the center of a sensor of the transient electromagnetic device.
The RTK mobile station is located at the center of a sensor of the transient electromagnetic device, and the RTK mobile station and the transient electromagnetic system measure the measuring area together, so that the coordinate data measured at the same time are consistent with the position of the induced voltage data.
S300: and the host receives the coordinate data and the induced voltage data and records the time of generating the coordinate data and the time of generating the induced voltage data.
The host computer can record the time when each coordinate data and signal data are generated while receiving the coordinate data and the induced voltage data, the coordinate data and the signal data are associated by the time when the later data are processed, and the signal data collected at any time and the position of the sensor at the time can be known by the association mode.
S400: and performing data processing on the coordinate data and the induced voltage data through time correlation between the time when the coordinate data are generated and the time when the induced voltage data are generated to generate measuring point data.
Specifically, as shown in fig. 2, the processing the coordinate data and the induced voltage data to generate the measurement point data includes:
s401: and carrying out coordinate matching on the coordinate data and the induced voltage data.
Since the frequency generated by the coordinate data is not consistent with the frequency generated by the signal data, the two moments cannot be completely in one-to-one correspondence, and therefore, coordinate matching is required for data in which the generation moment of the induced voltage data is different from the generation moment of any coordinate data.
In this embodiment, the frequency of the coordinate data is 10Hz, and the frequency of the induced voltage data is 16 Hz. The time interval of each coordinate data is 0.1 s. During measurement, the moving speed of the sensor of the transient electromagnetic device is generally slow, and the sensor can be approximately considered to do uniform linear motion between every two coordinate data points (within 0.1 s). Let the coordinate position of the signal data at any time t be (x)t，yt) To do soTwo times T before and after the adjacent time T1，T2Has the coordinate data of (X)T1，YT1，T1)，(XT2，YT2，T2) Then T is2-T10.1 s. The coordinate position of the induced voltage data at any moment can be obtained:
xt＝10(t-T1)(XT2-XT1)+XT1
yt＝10(t-T1)(YT2-YT1)+YT1
wherein xt，ytHorizontal and vertical coordinates respectively representing signal data at time t; t is1Indicating a time at which the RTK coordinate data exists closest to time t before time t; t is2Indicating the time at which the RTK coordinate data exists closest to time t after time t.
And obtaining coordinate data corresponding to the generation time of each induced voltage data through the coordinate matching. However, in the data acquisition process, due to the problems of irregular terrain of the transformer substation or interference of field equipment and the like, the acquisition area is generally in an irregular pattern.
S402: and presetting a rectangular data area, wherein the data area contains all coordinate data.
S403: and subdividing the rectangular data area to generate a plurality of square grids. In this embodiment, the formed rectangular data area is subdivided by a plurality of squares with equal side length, and the size of the side is determined according to the detection accuracy and the size of the grounding grid (usually 1 m).
S404: and superposing the induction voltage data corresponding to the coordinate data points in the grid to obtain the measuring point data of the grid. Although the number of coordinate points is inconsistent between different grids, the number of times of superposition of each measuring point is different. However, the buried depth of the grounding grid is shallow, signals are mainly reflected in the early stage, and the response signals of the grounding grid are strong, so that the influence of inconsistent superposition times on the detection effect is almost not influenced. And carrying out coordinate matching and meshing subdivision on the measured data to realize the pretreatment of the measured data and convert the measured data into measuring point data which can be used for further treatment.
S405: and selecting the central position coordinates of the grid as the position coordinates of the measuring point data.
S500: and performing inversion imaging on the measuring point data to obtain the grounding grid fault and corrosion degree conditions in the detection area.
After data inversion and imaging technical means are carried out, the corrosion condition of the grounding grid at each position of the detected area can be obtained. In the implementation, the coordinate data is recorded while the signal data is measured, so that the time for fixing the point at the earlier stage is saved. Meanwhile, compared with the traditional point measurement, the scanning type measurement has the advantages of high measurement efficiency, controllable detection precision and the like.
The system structurally combines a high-precision differential positioning system, so that the coordinate data can be measured while the signal data is measured, and the construction efficiency of corrosion diagnosis of the transient electromagnetic grounding network is greatly improved. Meanwhile, compared with the traditional single-point measurement mode, corresponding parameters can be adjusted according to different sizes of grounding grid meshes and different precision requirements in the data processing process, and the precision of positioning the corrosion points of the grounding grid is improved.
In order to improve the accuracy of the result, the method for detecting and positioning the corrosion of the grounding grid further comprises the following steps:
s600: and whitening the area outside the rectangular data area. After the graph is formed, whitening is carried out on the plan view according to actually detected coordinate data, the area without data is whitened, namely the area outside the rectangular data area is whitened, and the plan view of the corrosion condition of the grounding grid corresponding to the detected area is formed to improve the accuracy of the result.
In summary, the present application discloses a method for detecting and positioning corrosion of a ground grid, which includes: the RTK rover station collects coordinate data of the measuring points and transmits the coordinate data to the host computer. The transient electromagnetic device collects induced voltage data of a measuring point and transmits the induced voltage data to the host, wherein a sensor of the transient electromagnetic device is fixedly connected with the RTK mobile station and has consistent coordinates. And the host receives the coordinate data and the induced voltage data and records the time of generating the coordinate data and the time of generating the induced voltage data. And performing data processing on the coordinate data and the induced voltage data through time correlation between the time when the coordinate data are generated and the time when the induced voltage data are generated to generate measuring point data. And performing inversion imaging on the measuring point data to obtain the grounding grid fault and corrosion degree conditions in the detection area. According to the method, a high-precision differential positioning system is structurally combined, the coordinate data are measured while the induction data are measured, and the construction efficiency of corrosion diagnosis of the transient electromagnetic grounding network is greatly improved. Meanwhile, compared with the traditional single-point measurement mode, corresponding parameters can be adjusted according to different sizes of grounding grid meshes and different precision requirements in the data processing process, and the precision of positioning the corrosion points of the grounding grid is improved.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (3)
1. A method for detecting and positioning corrosion of a grounding grid is characterized by comprising the following steps:
the RTK mobile station collects coordinate data of a measuring point and transmits the coordinate data to the host;
the method comprises the steps that a transient electromagnetic device collects induced voltage data of a measuring point and transmits the induced voltage data to a host, wherein a sensor of the transient electromagnetic device is fixedly connected with an RTK mobile station;
the host receives the coordinate data and the induced voltage data and records the time of generating the coordinate data and the time of generating the induced voltage data;
performing data processing on the coordinate data and the induced voltage data through time correlation between the time when the coordinate data are generated and the time when the induced voltage data are generated to generate measuring point data;
and performing inversion imaging on the measuring point data to obtain the grounding grid fault and corrosion degree conditions in the detection area.
2. The grounding grid corrosion detection and positioning method according to claim 1, wherein the coordinate data and the induced voltage data are subjected to data processing to generate measuring point data, and the method comprises the following steps:
carrying out coordinate matching on the coordinate data and the induced voltage data;
presetting a rectangular data area, wherein the data area contains all coordinate data;
subdividing the rectangular data area to generate a plurality of square grids;
superposing the induction voltage data corresponding to the coordinate data points in the grid to obtain measuring point data of the grid;
and selecting the central position coordinates of the grid as the position coordinates of the measuring point data.
3. The grounding grid corrosion detection positioning method according to claim 2, further comprising: and whitening the area outside the rectangular data area.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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