Three-axis detection device for transformer substation grounding grid

Abstract

A three-axis detection device for a transformer substation grounding grid comprises a shell and three magnetic sensors arranged in the shell, three installation planes are arranged in the shell, the three installation planes are perpendicular in pairs, the three magnetic sensors are arranged on the installation planes in a one-to-one correspondence mode, and the magnetic sensors are arranged on the installation planes in a one-to-one correspondence mode. Each magnetic sensor comprises an iron core fixedly connected with the inner wall of the shell and a coil sleeved on the iron core, the iron core is detachably connected with an anti-falling disc, the three magnetic sensors are used for acquiring magnetic field signals in three directions of the position where the magnetic induction intensity receiving device is located, the three mounting planes are respectively an xoy plane, an xoz plane and a yoz plane, and the magnetic induction intensity receiving device is arranged on the shell. The three magnetic sensors are located on the xoy plane to detect the magnetic field intensity in the z direction, the xoz plane to detect the magnetic field intensity in the y direction and the yoz plane to detect the magnetic field intensity in the x direction, the detection accuracy is guaranteed, and meanwhile operation is easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to substation grounding grid technical field, specifically is a kind of three-axis detection device for substation grounding grid. BACKGROUND

[0002] Grounding grid is an important component of substation, it provides a common potential reference point for various equipment in substation, provides current discharge channel when short-circuit fault or suffers lightning in power system, and its reliability of work is important to the safe and stable operation of power system.

[0003] Grounding grid itself belongs to concealed engineering, and it is difficult to find the real topological structure of underground ground grid under the condition of not large-area excavation after construction is completed. Operating experience shows that there are serious inconsistencies between a considerable number of actual power grid structures and construction drawings, and there are problems of arbitrary connection and construction without drawing in general, and there are even cases of missing grounding grid conductors in areas with few equipment or relatively unimportant equipment. Therefore, it is very important to detect grounding grid during the operation of substation.

[0004] In the traditional acceptance process of substation grounding grid, it is usually evaluated by measuring electrical parameters such as grounding impedance, step voltage, contact voltage and conductivity of grounding grid. If only a few conductors are missing in the grounding grid, it usually does not have a significant impact on the overall grounding impedance. Similarly, even if high resistivity material is laid on the surface of the substation, step voltage and contact voltage will not be greatly affected, so it is difficult to find the missing conductors in the grounding grid by these methods. When conducting conductivity test of grounding grid, since grounding grid usually uses low resistivity materials such as copper or flat steel, as long as there is no welding leakage phenomenon, the test result is usually in line with the standard.

[0005] There is no mandatory requirement to measure the integrity of the physical topological structure of the grounding grid at the time of handover and acceptance. After the grounding grid is in operation, its corrosion condition will be diagnosed, but the diagnosis result may be affected by the consistency of the actual grounding grid and the design drawing. In order to standardize the construction of grounding grid, ensure its consistency with construction drawing, and provide technical support for the operation and maintenance of grounding grid, a magnetic sensor is usually used for mobile detection above the grounding grid. In order to improve the accuracy of detection, the magnetic sensor is usually used to detect at least two directions in turn, and the position of the magnetic sensor needs to be adjusted constantly during this process, which is relatively troublesome to operate. UTILITY MODEL CONTENTS

[0006] In order to solve the problem of relatively troublesome operation of the prior art using a magnetic sensor to measure at least two directions, the utility model provides a three-axis detection device for substation grounding grid, which ensures the accuracy of detection and is relatively simple to operate.

[0007] The utility model discloses a technical scheme that solves the above technical problem is used: a three -axis detection device of transformer substation grounding grid, including shell and three setting in the shell magnetic sensor, the inside of shell is provided with three installation plane, and three installation plane two two perpendicular, three magnetic sensors one -to-one setting on the installation plane, and the magnetic sensor includes the iron core and the coil of setting on the iron core with the inner wall fixed connection of shell, and the iron core is detachably connected with the anti -drop disc of preventing.

[0008] As the further optimization of the utility model three -axis detection device of transformer substation grounding grid: the inner fixed setting of shell has the thimble one -to-one with the iron core, and the inner wall of thimble and the surface between the iron core form the accommodation space for accommodating the coil.

[0009] As the further optimization of the utility model three -axis detection device of transformer substation grounding grid: the three -axis detection device includes the mainboard setting in the shell, and the mainboard includes the processor, and the processor is connected with the magnetic sensor, and the mainboard is provided with a plurality of connectors connected with the processor, and the shell is provided with the through -hole for the connector to extend.

[0010] As the further optimization of the utility model three -axis detection device of transformer substation grounding grid: the inner fixed setting of shell has the first installation strip and two first baffle, and the first installation strip is provided with the first installation through slot, and the first installation channel for the mainboard is formed between the two first baffles, and the mainboard is along the first installation channel and is extended into the first installation through slot, and the mainboard is detachably connected with the first installation through slot and two first baffles.

[0011] As the further optimization of the utility model three -axis detection device of transformer substation grounding grid: the both ends of the first installation strip are fixedly provided with the mounting, and the mounting includes two side plates, and the two side plates are fixedly connected through the connecting plate, and the installation space is formed between the two side plates, when the mainboard is located in the first installation through slot, the mainboard is located in the installation space, and the mainboard is connected with the two side plates of mounting through the first bolt, and the first baffle is fixedly provided with the mounting plate, and the mainboard is connected with two mounting plates through the second bolt.

[0012] As the further optimization of the utility model three -axis detection device of transformer substation grounding grid: the first installation through slot is provided with the notch on the side close to the through -hole.

[0013] As the further optimization of the utility model three -axis detection device of transformer substation grounding grid: the inner setting of shell has the positioning plate, and the positioning module connected with the processor is fixedly set up on the positioning plate.

[0014] As a further optimization of the utility model three -axis detection device for substation grounding grid: the shell is fixedly provided with a second installation strip and two second baffle, the second installation strip is provided with a second installation slot, the second installation channel is formed between the two second baffles for the positioning plate, the positioning plate is inserted into the second installation slot along the second installation channel.

[0015] As a further optimization of the utility model three -axis detection device for substation grounding grid: the main plate is provided with a posture determination module, and the posture determination module is connected with the processor.

[0016] As a further optimization of the utility model three -axis detection device for substation grounding grid: the shell has an opening, and the shell is detachably connected with a panel for closing the opening, the inner side of the opening is provided with a plurality of connecting blocks, and the panel is connected with the connecting blocks through connecting bolts.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1) the utility model discloses a three -axis detection device for substation grounding grid, which comprises a shell and three magnetic sensors in the shell, the inside of the shell is provided with three installation planes, and the three installation planes are perpendicular to each other, three magnetic sensors are arranged on the installation planes one by one, for acquiring the magnetic field signal of three directions of the position of the magnetic induction intensity receiving device, the three installation planes are xoy plane, xoz plane and yoz plane respectively, the three magnetic sensors are located in xoy plane to detect the magnetic field intensity of z direction, xoz plane to detect the magnetic field intensity of y direction and yoz plane to detect the magnetic field intensity of x direction, so that the detection accuracy is guaranteed, and the operation is relatively simple.

[0019] 2) the utility model discloses a posture determination module, and the posture determination module is parallelly installed with the magnetic sensor located in xoy plane, so that the three -axis detection device does not occur angle deviation in the detection process.

[0020] 3) the utility model discloses a positioning plate, and the positioning plate is fixedly provided with a positioning module connected with the processor, and the positioning module is used for acquiring the real-time coordinates and motion trail of the label in the detection process. DETAILED DESCRIPTION

[0021] Fig. 1 It is the internal schematic diagram of the utility model;

[0022] Fig. 2 It is the external schematic diagram of the utility model;

[0023] Fig. 3 It is the cooperation schematic diagram of the main plate, through hole and first baffle of the utility model;

[0024] Fig. 4It is the explosion chart of the utility model;

[0025] Marked in the figure: 1, shell, 2, panel, 3, iron core, 4, first connecting hole, 5, coil, 6, anti-off disc, 7, second connecting hole, 8, mainboard, 9, joint, 10, through hole, 11, positioning module, 12, positioning plate, 13, first mounting strip, 14, second mounting strip, 15, first baffle, 16, collar, 17, connecting block, 18, first mounting slot, 19, first mounting channel, 20, connecting plate, 21, side plate, 22, notch, 23, second baffle, 24, mounting plate, 25, second mounting channel, 26, second mounting slot, 27, containing space. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be further described in detail in combination with specific embodiments, and the parts not described and disclosed in the following embodiments of the utility model should be understood as the prior art known or known by the person skilled in the art, such as the working principle of the magnetic sensor, the positioning module 11 and the attitude determination module, how the processor is connected with the magnetic sensor, the positioning module 11 and the attitude determination module, etc.

[0027] Embodiment 1

[0028] A three-axis detection device for a substation grounding grid, like Figs. 1 to 4As shown, including the shell 1 and three magnetic sensors arranged in the shell 1, the shell 1 is selected from carbon fiber reinforced materials, and has a longer service life in harsh environments. The shell 1 is a standard cube, the xoy plane is parallel to the horizontal plane, the edge length of the x and y axes is 15 cm, and a scale with an accuracy of 0.1 cm is engraved thereon. During detection, the accurate distance between each detection point around can be obtained by moving the three-axis detection device. The inside of the shell 1 is provided with three mounting planes, and the three mounting planes are perpendicular to each other, and the three magnetic sensors are correspondingly arranged on the mounting planes, for obtaining the magnetic field signals in three directions of the position of the magnetic induction intensity receiving device, ensuring the detection accuracy, and the operation is relatively simple. The magnetic induction intensity receiving device is a conventional prior art in the art, and will not be described in detail here. The three mounting planes are xoy plane, xoz plane and yoz plane, and the three magnetic sensors are located in the xoy plane to detect the magnetic field intensity in the z direction, the xoz plane to detect the magnetic field intensity in the y direction and the yoz plane to detect the magnetic field intensity in the x direction. The magnetic sensor includes a core 3 fixedly connected with the inner wall of the shell 1 and a coil 5 sleeved on the core 3, and a anti-off disc 6 is detachably connected to the core 3. The core 3 is provided with a first connecting hole 4 along the axial direction, the anti-off disc 6 is provided with a second connecting hole 7 along the axial direction, and the bolt passes through the first connecting hole 4 and the second connecting hole 7 in sequence and is screwed with the first connecting hole 4 and the second connecting hole 7 in sequence. The inner fixed of the shell 1 is provided with a sleeve ring 16 corresponding to the core 3, and a containing space 27 for containing the coil 5 is formed between the inner wall of the sleeve ring 16 and the surface of the core 3.

[0029] The three-axis detection device includes a mainboard 8 arranged in the shell 1, the mainboard 8 includes a processor, the processor is connected with the magnetic sensor, and a plurality of connectors 9 connected with the processor are arranged on the mainboard 8. The shell 1 is provided with a through hole 10 for the connector 9 to extend out. In order to facilitate the installation of each component inside the shell 1, the shell 1 has an opening, and the shell 1 is detachably connected with a panel 2 for closing the opening. A plurality of connecting blocks 17 are arranged on the inner side of the opening, and connecting screw holes are arranged on the connecting blocks 17. The panel 2 is connected with the connecting blocks 17 by connecting bolts, and the connecting bolts are screwed with the connecting screw holes after passing through the perforations on the panel 2.

[0030] The posture judgment module is arranged on the mainboard 8 and is connected with the processor. The posture judgment module selects a WT901C posture sensor which is installed in parallel with the magnetic sensor in the xoy plane to ensure that the three-axis detection device does not deviate in angle during the detection process. The reference direction of the posture sensor is a direction parallel to the horizontal plane and a vertical direction; when the detection is standardized in the horizontal plane, the angle deviation of the x-axis, y-axis and z-axis of the three-axis detection device output by the posture sensor is all 0°; when the detection is not standardized in the non-horizontal plane, the angle deviation of the x-axis, y-axis and z-axis of the three-axis detection device output by the posture sensor changes, if the deviation angle changes by 10°, a pre-warning is sent to remind the operator to correct the position of the magnetic sensor; the detection device of the three-axis detection device is adjusted according to the pre-warning so that the detection angle of the three-axis detection device is always in the direction parallel to the horizontal plane and the vertical direction, and it is ensured that the three-axis detection device does not deviate in angle during the detection process.

[0031] A positioning plate 12 is arranged in the shell 1, and a positioning module 11 connected with the processor is fixedly arranged on the positioning plate 12. The positioning module 11 selects a UWB positioning module 11. The UWB positioning module 11 includes two parts of a base station and a tag, and the base station needs to be arranged in the transformer substation as a reference coordinate in advance before the detection starts. The tag of the UWB positioning module 11 is built-in in the magnetic induction intensity receiving device and is connected with the system hardware circuit to obtain the real-time coordinates and motion trajectory of the tag during the detection process.

[0032] The system hardware circuit of the three-axis detection device is composed of a signal conditioning circuit, a signal acquisition circuit, a Bluetooth output module and a device power supply. The signal conditioning circuit module is connected with the magnetic sensor and is used for performing power frequency notch filtering, filtering, amplification and other operations on the magnetic field signals acquired by the magnetic sensor to eliminate the electromagnetic interference problem of the transformer substation; the signal acquisition circuit acquires the posture angle signal, the magnetic field signal and the UWB positioning signal, and coordinates the transmission of data flow between modules to realize the synchronous processing, buffering and output of data; the Bluetooth output module synchronously outputs the processed UWB positioning data, the posture angle signal and the magnetic field signal to USB; the device power supply selects a rechargeable lithium battery with a power display to supply power to the entire device.

[0033] The use steps of the three-axis detection device during the detection process are as follows:

[0034] S1, place the grounding grid structure and the buried depth three-axis detection device at any position above the grounding grid ground surface, and mark the position as detection point 1;

[0035] S2, turn on the device power supply to supply power to the three-axis detection device;

[0036] S3, the posture judgment module and the positioning module 11 of the three-axis detection device record the position information and the posture angle information of the detection position;

[0037] S4, the magnetic sensor of the triaxial detection device detects the ground magnetic field data in three directions of the position;

[0038] S5, the system hardware circuit performs power frequency filtering, trap wave and amplification on the acquired magnetic field signal in real time, transmits the processed ground magnetic field data through USB, and simultaneously transmits the position information and attitude angle information of the detection position;

[0039] S6, the other two points 30cm away from the detection point are quickly determined through the scale on the shell 1 of the triaxial detection device;

[0040] S7, the detection angle of the detection device is adjusted according to the attitude angle warning given by the detection system attitude discrimination system at the two points respectively, and the above steps S3 to S5 are repeated to measure the magnetic field intensity, position and attitude angle at the two points respectively;

[0041] S8, replace the detection point, repeat the above steps S3 to S7 to perform the next group of measurements until all the detection points are detected.

[0042] S9, according to all the detection data transmitted by USB, the actual topological structure and buried depth schematic diagram of the grounding grid conductor of the whole substation are drawn.

[0043] The above is the basic embodiment of the utility model, which can be further improved, optimized and limited on the basis of the above, so as to obtain the following embodiments:

[0044] Embodiment 2

[0045] This embodiment is an improved scheme based on embodiment 1, and the main structure is the same as that of embodiment 1, and the improvement point is that: in order to facilitate the installation of the main board 8, the first mounting strip 13 and the two first baffles 15 are fixedly arranged in the shell 1, the first mounting slot 18 is formed on the first mounting strip 13, the first installation channel 19 for the main board 8 to pass through is formed between the two first baffles 15, the main board 8 extends into the first mounting slot 18 along the first installation channel 19, and the main board 8 is detachably connected with the first mounting slot 18 and the two first baffles 15. Since the first mounting strip 13 is close to the through hole 10, a notch 22 is arranged on the side of the first mounting slot 18 close to the through hole 10, so as to avoid the first mounting strip 13 from shielding the through hole 10.

[0046] Both ends of the first mounting strip 13 are fixedly provided with mounting pieces, the mounting pieces comprise two side plates 21, the two side plates 21 are fixedly connected through a connecting plate 20, and an installation space is formed between the two side plates 21; when the main plate 8 is located in the first mounting slot 18, the main plate 8 is located in the installation space, and the main plate 8 is connected with the two side plates 21 of the mounting piece through first bolts, so that the main plate 8 is prevented from falling off. The first baffle 15 is fixedly provided with mounting plates 24, and the main plate 8 is connected with the two mounting plates 24 through second bolts, so that the connection of the main plate 8 is further reinforced.

[0047] Embodiment 3

[0048] This embodiment is an improved scheme on the basis of embodiment 1, and the main body structure is the same as that of embodiment 1, and the improvement point lies in that: in order to facilitate installation of the positioning plate 12, the second mounting strip 14 and two second baffles 23 are fixedly arranged in the shell 1, the second mounting strip 14 is provided with a second mounting slot 26, and the second mounting channel 25, through which the positioning plate 12 passes, is formed between the two second baffles 23, and the positioning plate 12 extends into the second mounting slot 26 along the second mounting channel 25. In this way, the positioning plate 12 only needs to be installed in a plug-in mode, and if more firmness is required, the connection mode of the main plate 8 can also be referred to, mounting pieces are fixedly arranged at both ends of the second mounting strip 14, mounting plates 24 are fixedly arranged on the second baffles 23, and the specific connection mode is the same as that of the main plate 8, and excessive details are not described herein again.

[0049] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A triaxial detection device for substation grounding grids, characterized in that: It includes a housing (1) and three magnetic sensors disposed inside the housing (1). The housing (1) has three mounting planes inside, and the three mounting planes are perpendicular to each other. The three magnetic sensors are disposed on the mounting planes one by one. The magnetic sensors include an iron core (3) fixedly connected to the inner wall of the housing (1) and a coil (5) sleeved on the iron core (3). An anti-detachment disc (6) is detachably connected to the iron core (3).

2. The triaxial detection device for substation grounding grid as described in claim 1, characterized in that: The outer shell (1) is fixedly provided with a collar (16) corresponding to the iron core (3), and a receiving space (27) for accommodating the coil (5) is formed between the inner wall of the collar (16) and the surface of the iron core (3).

3. The triaxial detection device for substation grounding grid as described in claim 1, characterized in that: The triaxial detection device includes a main board (8) disposed inside the housing (1). The main board (8) includes a processor connected to the magnetic sensor. The main board (8) is provided with several connectors (9) connected to the processor. The housing (1) is provided with through holes (10) for the connectors (9) to extend out.

4. The triaxial detection device for substation grounding grid as described in claim 3, characterized in that: The outer casing (1) is fixedly provided with a first mounting strip (13) and two first baffles (15). The first mounting strip (13) has a first mounting through groove (18). A first mounting channel (19) is formed between the two first baffles (15) for the main board (8) to pass through. The main board (8) extends into the first mounting through groove (18) along the first mounting channel (19), and the main board (8) is detachably connected to the first mounting through groove (18) and the two first baffles (15).

5. The triaxial detection device for substation grounding grid as described in claim 4, characterized in that: The first mounting strip (13) has mounting components fixedly installed at both ends. The mounting components include two side plates (21). The two side plates (21) are fixedly connected by a connecting plate (20), and an installation space is formed between the two side plates (21). When the main board (8) is located in the first mounting through groove (18), the main board (8) is located in the installation space. The main board (8) is connected to the two side plates (21) of the mounting component by a first bolt. The first baffle (15) is fixedly provided with a mounting plate (24). The main board (8) is connected to the two mounting plates (24) by a second bolt.

6. The triaxial detection device for substation grounding grid as described in claim 4, characterized in that: The first mounting slot (18) has a notch (22) on the side near the through hole (10).

7. The triaxial detection device for substation grounding grid as described in claim 3, characterized in that: A positioning plate (12) is provided inside the outer casing (1), and a positioning module (11) connected to the processor is fixedly provided on the positioning plate (12).

8. The triaxial detection device for substation grounding grid as described in claim 7, characterized in that: The outer casing (1) is fixedly provided with a second mounting strip (14) and two second baffles (23). The second mounting strip (14) is provided with a second mounting groove (26). A second mounting channel (25) is formed between the two second baffles (23) for the positioning plate (12) to pass through. The positioning plate (12) extends into the second mounting groove (26) along the second mounting channel (25).

9. The triaxial detection device for substation grounding grid as described in claim 1, characterized in that: The outer shell (1) has an opening, and the outer shell (1) is detachably connected to a panel (2) for closing the opening. Several connecting blocks (17) are provided on the inner side of the opening, and the panel (2) is connected to the connecting blocks (17) by connecting bolts.

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