CN211263803U - Grounding grid topological structure measuring device with wireless transmission function - Google Patents
Grounding grid topological structure measuring device with wireless transmission function Download PDFInfo
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- CN211263803U CN211263803U CN202020287296.0U CN202020287296U CN211263803U CN 211263803 U CN211263803 U CN 211263803U CN 202020287296 U CN202020287296 U CN 202020287296U CN 211263803 U CN211263803 U CN 211263803U
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Abstract
The utility model discloses a grounding grid topological structure measuring device with wireless transmission function. The utility model discloses an alternating current excitation current source and detection terminal, detection terminal include magnetic field measurement sensor group, wireless communication module, coordinator, main control module and host computer, magnetic field measurement sensor group include a plurality of magnetic field measurement sensor; the alternating current excitation current source is used for being connected with the grounding grid, so that an induction magnetic field is generated above the grounding grid; the magnetic field measuring sensor group is used for measuring magnetic field characteristic signals of the grounding grid and sending collected data through the wireless communication module, and the coordinator identifies the network address of the wireless communication module and uploads the collected data to the upper computer through the main control module. The utility model adopts the external AC excitation current source as the magnetic field signal generator, thus improving the accuracy of the measuring result; the acquired data is transmitted in a wireless mode in real time, the complexity of field wiring is avoided, and the detection efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of the grounding grid and specifically relates to a magnetic field method grounding grid topological structure measuring device with wireless transmission function.
Background
The grounding grid is an important device necessary for maintaining the stable operation of the power system and ensuring the safety of power operation and maintenance personnel and electrical equipment. When the electrical equipment is struck by lightning or the short circuit fault of an electric power system occurs, the fault current can be rapidly drained through the grounding grid, and the ground potential rise is reduced. Therefore, the performance of the grounding grid is of great significance to the safe operation of the power system. Due to the influence of factors such as the operating life, soil conditions and the like, the laid grounding grid may be corroded to different degrees, once the grounding grid has one corrosion point, the corrosion speed of the whole branch is accelerated, and in order to avoid the development of large-area corrosion caused by the local corrosion and the influence on the whole grounding grid, a branch corrosion state detection method of the grounding grid needs to be researched.
Experts and scholars at home and abroad make a great deal of research on the defect diagnosis work of the grounding grid, and the corrosion diagnosis method for the grounding grid at present is mainly based on a circuit theory, an electromagnetic field theory and an electrochemical theory. However, effective means for detecting the branch impedance and the fault of the grounding grid are lacked when the topological structure is unknown, so that the branch fault of the grounding grid cannot be found in time, and therefore, the research on the positioning method of the grounding grid topology has important significance for improving the corrosion diagnosis level of the grounding grid.
Because the power equipment of the transformer substation is connected with the grounding grid through the grounding downlead, the grounding grid lead mode above the ground surface is easy to distinguish, but the trend of the grounding grid and the topological distribution of the grounding grid are difficult to distinguish below the ground surface. In addition, some transformer substations are long in construction age, and the grounding grid design drawing is damaged or lost, so that the transformation and upgrading of the grounding grid are difficult to perform. Due to the limitation of the construction level, the situation that the actual down lead of the grounding grid does not correspond to the topological structure of the design drawing exists in some transformer substations, so that much inconvenience is brought to the transformer substation grounding grid state detection work of the power department, and a large error can be brought to the corrosion diagnosis result. Meanwhile, as the devices on the transformer substation site are numerous, the environment is complex, the efficiency of the traditional wired measuring mode is not high, and the safety of workers in the wiring process is difficult to guarantee, the difficulty of detection and diagnosis of the grounding grid is increased.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and to provide a magnetic field method grounding grid topological structure measuring device with wireless transmission function, which adopts an external ac excitation current source as a magnetic field signal generator to improve the accuracy of the measuring result; the real-time wireless transmission of the data is collected to avoid the trouble of on-site wiring, promote detection efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a grounding grid topological structure measuring device with a wireless transmission function comprises an alternating current excitation current source and a detection terminal, wherein the detection terminal comprises a magnetic field measurement sensor group, a wireless communication module, a coordinator, a main control module and an upper computer, and the magnetic field measurement sensor group comprises a plurality of magnetic field measurement sensors; the alternating current excitation current source is used for being connected with the grounding grid, so that an induction magnetic field is generated above the grounding grid;
the magnetic field measuring sensor group is used for measuring magnetic field characteristic signals of the grounding grid and sending collected data through the wireless communication module, and the coordinator identifies the network address of the wireless communication module and uploads the collected data to the upper computer through the main control module.
Furthermore, the coordinator and the main control module are integrated in an upper computer, namely the upper computer is a notebook computer or a desktop computer with the coordinator and the main control module.
Further, the alternating current excitation current source has a current amplitude of 1A and a frequency of 1kHz so as to generate a magnetic field signal which can be measured.
Furthermore, the wireless communication module is a Zigbee router, has a radio frequency end and a unique network address, and performs data communication with the upper computer.
Furthermore, the main control module is an MCU module.
Furthermore, the MCU module is an STM32F103VCT6 singlechip.
Further, the magnetic field measurement sensor group is: 8 magnetic field measurement sensors are fixed side by side between two fixed plates to form an 8 magnetic field measurement sensor array which is placed side by side, and the horizontal distance between adjacent magnetic field measurement sensors is 5 cm. The magnetic field measuring sensor of the utility model can adopt HMC1022 type magneto-resistor sensor of the HONEYWELL company.
Furthermore, the magnetic field measurement sensor comprises detection coils which are arranged on a PCB, the coils comprise at least two coil layers, leads of adjacent coil layers are connected end to end through cascade via holes of the coil layers, cascade superposition is carried out according to measurement requirements, signal injection and outflow end bonding pads are reserved on the top layer and the bottom layer of each coil, the bonding pads are connected with a filtering and amplifying circuit, two PCB plates are respectively added on the top layer and the bottom layer of each detection coil for shielding, and magnetic field signals can only pass through a middle opening of each shielding layer.
Furthermore, the detection terminal also comprises a signal processing circuit and a synchronous acquisition module, an induced magnetic field generated by alternating current exciting current injected into the grounding grid is converted into an induced voltage signal by using the magnetic field measurement sensor group, the induced voltage signal is subjected to amplification and filtering processing through the signal processing circuit, then the signals are synchronously acquired and stored by using the synchronous acquisition module, and finally the acquired data are wirelessly transmitted to the upper computer by using the wireless communication module.
The utility model discloses the beneficial effect who has as follows:
(1) the utility model discloses utilize magnetic field signal to detect, can realize the buried depth and the trend of ground net conductor according to the detection procedure and detect, saved huge excavation cost, reduced work load by a wide margin.
(2) The utility model discloses an external AC excitation current source is as magnetic field signal generator, and current amplitude selects to 1A, and the frequency selection is 1kHz, can effectively avoid the stronger frequency channel of power frequency odd harmonic interference, distinguishes the magnetic induction intensity of grounding net earth's surface and the background noise of transformer substation's electromagnetic field, improves measuring result's accuracy.
(3) The utility model discloses a Zigbee wireless communication module carries out measured data transmission, has avoided the loaded down with trivial details of on-the-spot wiring to measuring result synchronous transmission handles in real time, promotes detection efficiency greatly.
Drawings
FIG. 1 is a schematic diagram of the structure and the specific implementation method of the present invention;
FIG. 2 is a schematic diagram of the structure of the device according to the present invention;
fig. 3 is a wiring diagram of the coil layer of the present invention;
fig. 4 is a wiring diagram of the shielding layer of the present invention;
fig. 5 is a schematic structural view of the magnetic field measuring coil of the present invention;
fig. 6 is a schematic diagram of signal transmission for uploading the collected data to an upper computer in the embodiment of the present invention;
fig. 7 is a distribution diagram of the directional component of the magnetic field intensity at different coordinate positions obtained by the upper computer in the embodiment of the present invention.
In the figure: 1. detecting a terminal; 2. a wired communication data port; 3. a magnetic field measurement sensor group; 4. a device status display signal lamp; 5. a Zigbee router; 6. an AC excitation current source switch; 7. an alternating current excitation current source; 8. an alternating current excitation current source current output port; 9. a transformer substation grounding grid conductor; 10. a coil layer; 11. fixing holes between the coils; 12. a detection coil; 13. a PCB pad; 14. the coil layer is cascaded with the through hole; 15. a shielding layer; 16. opening holes in the shielding layer; 17. a coordinator; 18. an MCU module; 19. notebook or desktop.
Detailed Description
Referring to fig. 1-5, the utility model relates to a grounding grid topological structure measuring device with wireless transmission function, including alternating current excitation current source 7 and detection terminal 1, detection terminal 1 include magnetic field measurement sensor group 3, wireless communication module, coordinator 17, MCU module 18 and host computer, magnetic field measurement sensor group include a plurality of magnetic field measurement sensors; the alternating current excitation current source 7 is used for being connected with a grounding grid, so that an induction magnetic field is generated above the grounding grid. The upper computer is a notebook computer or a desktop computer 19 with a coordinator 17 and an MCU module 18, namely the coordinator and the MCU module are integrated in the upper computer.
The magnetic field measuring sensor group is used for measuring magnetic field characteristic signals of the grounding grid and sending collected data through the wireless communication module, the coordinator identifies the network address of the wireless communication module, and the collected data are uploaded to a notebook computer or a desktop computer through the MCU module.
The alternating current excitation current source has a current amplitude of 1A and a frequency of 1kHz in order to generate a magnetic field signal that can be measured.
The wireless communication module is a Zigbee router, is provided with a radio frequency end and a unique network address, and can carry out data communication with an upper computer. The communication design of the ZigBee router adopts a ZStack protocol stack, and the MCU module selects an STM32F103VCT6 singlechip.
The magnetic field measurement sensor group is as follows: 8 magnetic field measurement sensors are fixed between two fixed plates side by side to form an 8 magnetic field measurement sensor array placed side by side, and the horizontal distance between adjacent magnetic field measurement sensors is 10 cm. The magnetic field measuring sensor of the utility model can adopt HMC1022 type magneto-resistor sensor of the HONEYWELL company.
The magnetic field measuring sensor comprises detection coils arranged on a PCB, the coils comprise two layers of coil layers which are cascaded and overlapped, wires of adjacent coil layers are connected end to end through cascaded via holes of the coil layers, pads at the injection end and the outflow end of signals are reserved on the top layer and the bottom layer of the coils, the pads are connected with a filter amplifying circuit, two PCB boards are respectively added on the top layer and the bottom layer of the detection coils for shielding, and magnetic field signals can only pass through a middle opening of the shielding layer.
The detection terminal further comprises a signal processing circuit and a synchronous acquisition module, an induced magnetic field generated by alternating current exciting current injected into the grounding grid is converted into an induced voltage signal by the magnetic field measurement sensor group, the induced voltage signal passes through the signal processing circuit to be amplified and filtered, then the signals are synchronously acquired and stored by the synchronous acquisition module, and finally the acquired data are wirelessly transmitted to the upper computer by the wireless communication module.
The utility model discloses a location step as follows:
1. determining and marking an initial measurement node of a grounding grid: and finding out the grounding down lead closest to the corner of the region to be detected as a coordinate origin point in the region to be detected, establishing a two-dimensional coordinate system, injecting the alternating current excitation current of the alternating current excitation current source 7 from the origin point, and finding out the other grounding down lead closest to the origin point as a current output end, thereby generating an induction magnetic field above the grounding grid.
2. After the walking direction of the grounding grid conductor is roughly determined according to the distribution of the downlead, the detection terminal is placed right above the grounding grid conductor, the magnetic field characteristic signal is measured by the magnetic field measurement sensor group, the acquired data are sent out through the Zigbee router 5, the coordinator 17 at the upper computer end identifies the network address of the Zigbee router 5, and the acquired data are uploaded to the notebook computer or the desktop computer 19 through the MCU module 18, as shown in FIG. 6.
3. And drawing the distribution maps of the directional components of the magnetic field strength of the currently measured area at different coordinate positions by the upper computer according to the measurement result, moving the detection terminal along the direction of the conductor to perform full-line detection as shown in fig. 7, wherein the moving distance of the detection terminal is less than 0.8m during each measurement, and finally establishing the synthetic magnetic induction distribution map of the earth surface of the area to be measured.
The positioning method of the grounding grid conductor comprises the following steps:
fig. 7 is a distribution diagram of directional components of the magnetic field strength in the measured region at different coordinate positions, where the coil position corresponding to the peak value is the position of the obtained grounding grid conductor. The distance between every two adjacent measuring coils of the measuring device is 0.1m, and if the first measuring coil of the measuring device is taken as a starting point, the distance between the position where the magnetic field peak appears and the origin is multiplied by 0.1m to obtain the actual relative position of the grounding grid conductor.
The upper computer processes the distribution diagram of the direction component of the magnetic field intensity at different coordinate positions, the coordinate point corresponding to the peak value of the magnetic field intensity is the position of the grounding grid conductor, then the detection terminal is moved along the direction of the conductor to complete the whole-line detection, the whole analysis process is simple in step operation, the connection direction of the grounding grid down-lead under different grounding grid topological distributions can be accurately judged, the judgment result is accurate, and the method can be used as an important reference basis for grounding grid corrosion diagnosis modeling.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or equivalent replaced by some or all of the technical features, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A grounding grid topological structure measuring device with wireless transmission function comprises an alternating current excitation current source (7) and a detection terminal (1), and is characterized in that: the detection terminal (1) comprises a magnetic field measurement sensor group (3), a wireless communication module, a coordinator (17), a main control module and an upper computer, wherein the magnetic field measurement sensor group comprises a plurality of magnetic field measurement sensors; the alternating current excitation current source (7) is used for being connected with a grounding grid to enable an induction magnetic field to be generated above the grounding grid;
the magnetic field measuring sensor group (3) is used for measuring magnetic field characteristic signals of the grounding grid, transmitting acquired data through the wireless communication module, identifying the network address of the wireless communication module by the coordinator, and uploading the acquired data to the upper computer through the main control module.
2. The grounding grid topology structure measuring device with wireless transmission function of claim 1, wherein: and the coordinator (17) and the main control module are integrated in the upper computer.
3. The grounding grid topology structure measuring device with wireless transmission function according to claim 1 or 2, wherein: the current amplitude of the alternating current excitation current source (7) is 1A, and the frequency is 1 kHz.
4. The grounding grid topology structure measuring device with wireless transmission function according to claim 1 or 2, wherein: the wireless communication module is a Zigbee router (5) which is provided with a radio frequency end and a unique network address and is in data communication with the upper computer.
5. The grounding grid topology structure measuring device with wireless transmission function according to claim 1 or 2, wherein: the main control module is an MCU module (18).
6. The grounding grid topology structure measuring device with wireless transmission function as claimed in claim 5, wherein: the MCU module is an STM32F103VCT6 singlechip.
7. The grounding grid topology structure measuring device with wireless transmission function according to claim 1 or 2, wherein: the magnetic field measurement sensor group is as follows: 8 magnetic field measurement sensors are fixed between two fixed plates side by side to form an 8 magnetic field measurement sensor array placed side by side, and the horizontal distance between adjacent magnetic field measurement sensors is 10 cm.
8. The grounding grid topology structure measuring device with wireless transmission function of claim 7, wherein: the magnetic field measurement sensor comprises detection coils arranged on a PCB, the coils comprise at least two coil layers, wires of adjacent coil layers are connected end to end through coil layer cascading via holes and are cascaded and superposed according to measurement requirements, signal injection and outflow end bonding pads are reserved on the top layer and the bottom layer of each coil and are connected with a filter amplifying circuit, two PCB boards are respectively added on the top layer and the bottom layer of each detection coil to shield, and magnetic field signals can only pass through a middle opening of each shielding layer.
9. The grounding grid topology structure measuring device with wireless transmission function according to claim 1 or 2, wherein: the detection terminal (1) further comprises a signal processing circuit and a synchronous acquisition module, an induced magnetic field generated by alternating current exciting current injected into the grounding grid is converted into an induced voltage signal by the magnetic field measurement sensor group, the induced voltage signal is subjected to amplification and filtering processing through the signal processing circuit, then the signals are synchronously acquired and stored by the synchronous acquisition module, and finally, the measured data are sent to an upper computer by the aid of the Zigbee router.
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| CN202020287296.0U CN211263803U (en) | 2020-03-10 | 2020-03-10 | Grounding grid topological structure measuring device with wireless transmission function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112363019A (en) * | 2020-11-06 | 2021-02-12 | 云南电网有限责任公司电力科学研究院 | Grounding grid topological structure fault detection method and device |
| CN114295871A (en) * | 2021-12-30 | 2022-04-08 | 国网湖南省电力有限公司 | Non-excavation detection method and system for grounding grid of transmission high-voltage line tower |
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2020
- 2020-03-10 CN CN202020287296.0U patent/CN211263803U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112363019A (en) * | 2020-11-06 | 2021-02-12 | 云南电网有限责任公司电力科学研究院 | Grounding grid topological structure fault detection method and device |
| CN114295871A (en) * | 2021-12-30 | 2022-04-08 | 国网湖南省电力有限公司 | Non-excavation detection method and system for grounding grid of transmission high-voltage line tower |
| CN114295871B (en) * | 2021-12-30 | 2023-07-14 | 国网湖南省电力有限公司 | Method and system for detecting non-excavation of grounding grid of high-voltage transmission line tower |
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