Ultra-high voltage power grid overvoltage monitoring device based on Rogowski coil

Abstract

The utility model relates to the field of power system monitoring and protection, in particular to an ultra-high voltage power grid overvoltage monitoring device based on a Rogowski coil, which comprises a wire, fixed shells symmetrically sleeved on the outer side of the wire, a movable shell rotationally connected with one end of each fixed shell, and an overvoltage monitoring device connected with the other end of each movable shell, rogowski coils are fixedly connected to the interiors of the fixed shells through clamping blocks, the two fixed shells are fixed through a fixing assembly, the fixing assembly comprises fixed blocks and movable blocks, the sides, close to each other, of the two fixed shells are fixedly connected with the fixed blocks and the movable blocks, and the two fixed blocks are connected with the corresponding movable blocks in a clamped mode. One side, close to the fixed shell, of the movable shell is symmetrically and fixedly connected with limiting blocks, the fixed shell is connected with the limiting blocks in an inserted mode through limiting assemblies installed in the fixed shell, and the ultra-high-voltage power grid overvoltage monitoring device based on the Rogowski coil has the advantages of being convenient and efficient to install, accurate and sensitive in monitoring and excellent in protection performance.

Description

Technical Field

[0001] The utility model relates to the field of power system monitoring and protection, in particular to an overvoltage monitoring device for ultra-high voltage power grids based on Rogowski coils. Background Technique

[0002] The Rogowski coil, also known as a hollow coil, is a current transformer based on the principle of electromagnetic induction. It induces a voltage signal proportional to the rate of change of the current in the conductor through a coil wound around the conductor to be measured. In the power system, the Rogowski coil is commonly used to measure alternating current, especially in high-voltage and large-current situations. Due to its advantages such as a wide measurement range, good linearity, and fast response speed, it can accurately obtain current information and provide key data for the stable operation monitoring of the power system. In terms of overvoltage monitoring, it can assist in judging the overvoltage situation based on the change of the induced current;

[0003] In the existing overvoltage monitoring devices for ultra-high voltage power grids, as the core component, the Rogowski coil usually lacks effective mechanical protection measures. When the monitoring device needs to be buried underground for use, the complex underground environment, such as soil extrusion and stone collision, is extremely likely to cause physical damage to the Rogowski coil, thereby affecting its measurement accuracy and service life, resulting in a reduction in the reliability of overvoltage monitoring and being unable to accurately provide strong guarantee for the safe and stable operation of the ultra-high voltage power grid.

[0004] Therefore, it is necessary to provide a new overvoltage monitoring device for ultra-high voltage power grids based on Rogowski coils to solve the above technical problems. Content of the Utility Model

[0005] To solve the above technical problems, the utility model provides an overvoltage monitoring device for ultra-high voltage power grids based on Rogowski coils.

[0006] The overvoltage monitoring device for ultra-high voltage power grids based on Rogowski coils provided by the utility model includes: a wire, and fixing shells are symmetrically sleeved on the outer side of the wire. One end of each fixing shell is rotatably connected with a movable shell. A Rogowski coil is fixedly connected inside the fixing shell through a clamping block. The two fixing shells are fixed by a fixing component. The fixing component includes: a fixing block and a movable block. On the side where the two fixing shells are close to each other, a fixing block and a movable block are fixedly connected respectively. The two fixing blocks are clamped with the corresponding movable blocks. On the side of the movable shell close to the fixing shell, limiting blocks are symmetrically and fixedly connected. The fixing shell is inserted into the limiting blocks through a limiting component installed inside it.

[0007] Preferably, the fixing component further includes: a first spring and a pressing block. On the side where the two movable blocks face each other, a first spring is fixedly connected. One end of the first spring is fixedly connected to the inside of the fixing shell. On the side where the two movable blocks face away from each other, a pressing block is fixedly connected.

[0008] Preferably, the limiting component includes a sliding rod, a plug rod, a connecting block, a lever and a second spring. A sliding rod is slidably connected to the inner side of the fixed shell close to the movable shell, and a plug rod for inserting into the limiting block is slidably connected to the inside of the fixed shell. The plug rod and the sliding rod are fixed through the connecting block. The top of the connecting block inside the right fixed shell is fixedly connected to a lever, and the top of the lever extends out of the fixed shell. A second spring is fixedly connected to the inside of the fixed shell, and the second spring is fixedly connected to the connecting block close to the second spring.

[0009] Preferably, a wire is fixedly connected to the bottom of the Rogowski coil, and through holes for leading the wire out of the fixed shell are formed in the bottoms of the two fixed shells.

[0010] Preferably, the opposite surfaces of the two limiting blocks are flush with the opposite surfaces of the two movable blocks.

[0011] Preferably, the length of the lower group of the two groups of limiting blocks is shorter than the length of the upper group of limiting blocks.

[0012] Preferably, a sliding groove is formed in the outer wall of the fixed shell, and the lever slides in the sliding groove.

[0013] Preferably, a baffle is fixedly connected to the outer wall of the lever, and the length of the baffle is greater than twice the length of the sliding groove.

[0014] Compared with the related art, the overvoltage monitoring device for ultra-high voltage power grid based on Rogowski coil provided by the present invention has the following beneficial effects:

[0015] Convenient and efficient installation:

[0016] When installing the Rogowski coil, the unique design of the fixed shell and the pressing type fixing component makes the installation process simple. Only by pressing the pressing block and using the elasticity of the first spring can the connection of the two fixed shells be quickly completed, and the Rogowski coil can be accurately clamped into the clamping block, greatly saving the installation time and labor cost, improving the installation efficiency, and is especially suitable for the rapid deployment of large-scale power grid monitoring points;

[0017] Stable and reliable structure:

[0018] When closing the movable shell, the cooperation of the limiting component and the movable block effectively avoids the risk of the fixed block being disassembled due to accidental touch. After the limiting block is inserted into the fixed shell and contacts the movable block, a stable blocking structure is formed to ensure that in a complex environment, such as being subjected to external force collision or vibration, the components of the device can still be tightly connected, significantly enhancing the stability and reliability of the overall structure of the device and ensuring long-term stable operation;

[0019] Optimized electromagnetic induction effect:

[0020] When the wire is located at the center of the Rogowski coil, the magnetic field distribution surrounded by the Rogowski coil is more uniform and symmetric. According to the principle of electromagnetic induction, this can make the Rogowski coil more comprehensive and efficient in sensing the current change in the wire, greatly improving the generation quality of the induced electromotive force. In the operation of ultra-high voltage power grids, whether it is normal current fluctuations or current mutations caused by overvoltage, the Rogowski coil can accurately capture them, providing more accurate and reliable original electrical signals for subsequent overvoltage monitoring, effectively improving the accuracy of monitoring;

[0021] Excellent protection performance:

[0022] The combined design of the fixed shell and the movable shell provides good mechanical protection for the Rogowski coil. When the device is buried underground or in a harsh environment, it can effectively resist external force factors such as soil extrusion and stone collision that may damage the Rogowski coil, extend the service life of the Rogowski coil, reduce monitoring interruptions caused by component damage, and improve the protection performance and durability of the monitoring device;

[0023] Can be used both above and below ground:

[0024] This device seals the Rogowski coil through the movable shell and the protective shell, enabling stable monitoring whether the Rogowski coil is used above ground or underground. Brief description of the drawings

[0025] Figure 1 It is a schematic structural diagram of the overvoltage monitoring device for ultra-high voltage power grids based on the Rogowski coil provided by the present utility model;

[0026] Figure 2 For Figure 1 The schematic structural diagram after the movable shell shown in the figure is closed;

[0027] Figure 3 For Figure 2 The schematic structural diagram of the fixed shell shown in the figure;

[0028] Figure 4 For Figure 3 The schematic structural diagram of part A shown in the figure;

[0029] Figure 5 For Figure 3 The schematic structural diagram of the lever shown in the figure;

[0030] Figure 6 For Figure 3 The schematic structural diagram of the bottom of the movable shell shown in the figure.

[0031] Reference numerals in the figure: 1, wire; 2, fixed shell; 3, movable shell; 4, clamping block; 5, Rogowski coil; 6, fixed block; 7, movable block; 8, limiting block; 9, first spring; 10, pressing block; 11, sliding rod; 12, inserting rod; 13, connecting block; 14, lever; 15, wire; 16, sliding groove; 17, baffle; 18, second spring. Detailed implementation mode

[0032] In order to make the purpose, technical solution and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] The following details the specific implementation of the present utility model in conjunction with specific embodiments.

[0034] Please refer to Figures 1 to 6 , a monitoring device for overvoltage of ultra-high voltage power grid based on Rogowski coil 5. The monitoring device for overvoltage of ultra-high voltage power grid based on Rogowski coil 5 includes: wire 1, fixed shells 2 are symmetrically sleeved on the outer side of wire 1, movable shells 3 are rotatably connected to one end of each fixed shell 2, Rogowski coil 5 is fixedly connected to the inside of fixed shell 2 through clamping block 4, the two fixed shells 2 are fixed by a fixing component, and the fixing component includes: fixed block 6 and movable block 7. Fixed blocks 6 and movable blocks 7 are fixedly connected to one side of the two fixed shells 2 close to each other, the two fixed blocks 6 are clamped with the corresponding movable blocks 7, limiting blocks 8 are symmetrically and fixedly connected to one side of movable shell 3 close to fixed shell 2, and fixed shell 2 is inserted into limiting block 8 through a limiting component installed inside it. The fixing component further includes: first spring 9 and pressing block 10. First springs 9 are fixedly connected to one side of the two movable blocks 7 facing each other, one end of first spring 9 is fixedly connected to the inside of fixed shell 2, pressing blocks 10 are fixedly connected to one side of the two movable blocks 7 facing away from each other, wire 15 is fixedly connected to the bottom of Rogowski coil 5, through holes for wire 15 to lead out of fixed shell 2 are opened at the bottom of the two fixed shells 2, the surfaces of the two limiting blocks 8 facing away from each other are flush with the surfaces of the two movable blocks 7 facing each other, and the length of the lower group of the two groups of limiting blocks 8 is shorter than that of the upper group of limiting blocks 8;

[0035] It should be noted that after the two fixed cases 2 are fitted together, the two sliding rods 11 are fitted together. Only one lever 14 can be used to control the sliding of the two sliding rods 11. When the limiting block 8 is inserted into the fixed case 2, the limiting block 8 will be clamped with the movable block 7 to prevent the operation of the fixing component and avoid the accidental touch of the pressing block 10 resulting in the separation of the two fixed blocks 6. The fixed block 6 and the movable block 7 located below will not affect the lead wire 15 being led out from the through hole during the movement process, and this group of movable blocks 7 can still form a clamping connection with the limiting block 8. Under the combined action of the clamping block, the fixed case and the movable case, the electric wire is always located at the central position of the Rogowski coil;

[0036] Please refer to Figures 3 to 6 , the limiting component includes: a sliding rod 11, an inserting rod 12, a connecting block 13, a lever 14 and a second spring 18. A sliding rod 11 is slidably connected to the inner side of one side of the fixed case 2 close to the movable case 3. An inserting rod 12 for inserting with the limiting block 8 is slidably connected to the inside of the fixed case 2. The inserting rod 12 and the sliding rod 11 are fixed by the connecting block 13. The top of the connecting block 13 inside the fixed case 2 on the right side is fixedly connected with a lever 14. The top end of the lever 14 extends out of the fixed case 2. A second spring 18 is fixedly connected to the inside of the fixed case 2. The second spring 18 is fixedly connected with the connecting block 13 close to the second spring 18. A chute 16 is opened on the outer wall of the fixed case 2. The lever 14 slides in the chute 16. A baffle 17 is fixedly connected to the outer wall of the lever 14. The length of the baffle 17 is greater than twice the length of the chute 16;

[0037] It should be noted that the baffle 17 can block the chute 16 to prevent solids such as soil from entering the chute 16 after burial and affecting the use of the device.

[0038] The working principle of the ultra-high voltage power grid overvoltage monitoring device based on the Rogowski coil 5 provided by the present utility model is as follows:

[0039] Install the Rogowski coil 5:

[0040] First, sleuth the Rogowski coil 5 on the outside of the wire 1 to be measured. Then take out a fixed case 2, align the lead wire 15 of the Rogowski coil 5 with the through hole opened at the bottom of the fixed case 2, and snap half of the Rogowski coil 5 into the clamping block 4 inside the fixed case 2. Then take out another fixed case 2, align the two fixed cases 2 and then press the pressing block 10. The pressing block 10 squeezes the movable block 7 and compresses the first spring 9 to make the two fixed cases 2 fit tightly. The fixed block 6 fixedly connected to one of the fixed cases 2 will insert into the inside of the other fixed case 2. Release the pressing on the pressing block 10. The first spring 9 resets and drives the movable block 7 to reset. The movable block 7 is clamped with the fixed block 6 to realize the fixation of the two fixed cases 2. Finally, snap the remaining Rogowski coil 5 with the clamping block 4 inside the fixed case 2 taken out later;

[0041] Close the movable case 3:

[0042] Toggle the lever 14. The lever 14 drives the sliding rod 11 close to it to slide through the connecting block 13. When the sliding rod 11 close to the lever 14 slides, it squeezes another sliding rod 11 to slide. The sliding rod 11 drives the insertion rod 12 fixedly connected to it to slide through the connecting block 13. At the same time, the movement of the connecting block 13 will compress the second spring 18. Rotate the movable shell 3. The movable shell 3 gradually approaches the fixed shell 2 and inserts the limit block 8 into the fixed shell 2. Then release the lever 14. The second spring 18 resets and drives the connecting block 13 fixedly connected to it to slide. The connecting block 13 drives the insertion rod 12 and the sliding rod 11 to reset. The insertion rod 12 inserts into the limit block 8 to fix the limit block 8;

[0043] When the limit block 8 is inserted into the fixed shell 2, the side of the limit block 8 facing the movable block 7 comes into contact. At this time, if the pressing block 10 is pressed, the limit block 8 will prevent the movable block 7 from moving, that is, the pressing block 10 cannot be moved, which can effectively prevent the two fixed blocks 6 from being disassembled when the pressing block 10 is accidentally touched;

[0044] Underground monitoring process:

[0045] When the entire device is installed and all components are firmly connected, bury this device underground. The Rogowski coil 5 will start to play a core role. Since the Rogowski coil 5 is wound around the wire 1, according to the principle of electromagnetic induction, any change in the current in the wire 1 will cause the Rogowski coil 5 to generate a corresponding induced electromotive force. When the ultra-high voltage power grid is operating normally, the current is in a stable state, and the electromotive force induced by the Rogowski coil 5 is also maintained within a certain range. Once an overvoltage occurs in the power grid, the current will change violently instantaneously, and the electromotive force induced by the Rogowski coil 5 will also change sharply accordingly. The wire 15 fixedly connected to the bottom of the Rogowski coil 5 will lead out this changing electrical signal from the fixed shell 2 and transmit it to the subsequent signal processing and analysis module. This module will perform a series of processes on the electrical signal, such as amplification, filtering, analog-to-digital conversion, etc. Then, based on the preset overvoltage judgment algorithm, analyze and judge the processed signal. If it is determined that the power grid has an overvoltage, the monitoring device will promptly send an alarm signal to remind the operation and maintenance personnel to take corresponding measures to ensure the safe and stable operation of the ultra-high voltage power grid;

[0046] Above-ground monitoring

[0047] When this device does not need to be buried underground, it can be installed according to the above steps of installing the Rogowski coil 5 and closing the movable shell 3 for monitoring.

[0048] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. An overvoltage monitoring device for an extra-high voltage power grid based on a Rogowski coil, characterized in that, Including: A wire (1), with fixed shells (2) symmetrically sleeved on the outer side of the wire (1). One end of each fixed shell (2) is rotatably connected to a movable shell (3). A Rogowski coil (5) is fixedly connected inside the fixed shell (2) through a clamping block (4). The two fixed shells (2) are fixed by a fixing component, and the fixing component includes: a fixed block (6) and a movable block (7). On the side where the two fixed shells (2) are close to each other, a fixed block (6) and a movable block (7) are fixedly connected respectively. The two fixed blocks (6) are clamped with the corresponding movable blocks (7). On the side where the movable shell (3) is close to the fixed shell (2), a limiting block (8) is symmetrically and fixedly connected. The fixed shell (2) is inserted into the limiting block (8) through a limiting component installed inside it.

2. The overvoltage monitoring device for an extra-high voltage power grid based on a Rogowski coil according to claim 1, characterized in that The fixing component further includes: a first spring (9) and a pressing block (10). On the side where the two movable blocks (7) face each other, a first spring (9) is fixedly connected. One end of the first spring (9) is fixedly connected to the inside of the fixed shell (2). On the side where the two movable blocks (7) face away from each other, a pressing block (10) is fixedly connected.

3. The overvoltage monitoring device for an extra-high voltage power grid based on a Rogowski coil according to claim 1, wherein The limiting component includes: a sliding rod (11), an inserting rod (12), a connecting block (13), a dial rod (14) and a second spring (18). Inside the fixed shell (2) close to the movable shell (3), a sliding rod (11) is slidably connected. Inside the fixed shell (2), an inserting rod (12) for inserting into the limiting block (8) is slidably connected. The inserting rod (12) and the sliding rod (11) are fixedly connected through the connecting block (13). On the top of the connecting block (13) inside the fixed shell (2) on the right side, a dial rod (14) is fixedly connected. The top end of the dial rod (14) extends out of the fixed shell (2). Inside the fixed shell (2), a second spring (18) is fixedly connected. The second spring (18) is fixedly connected to the connecting block (13) close to the second spring (18).

4. The overvoltage monitoring device for an extra-high voltage power grid based on a Rogowski coil according to claim 1, characterized in that, The bottom of the Rogowski coil (5) is fixedly connected to a wire (15). Through holes for the wire (15) to lead out of the fixed shell (2) are opened at the bottom of the two fixed shells (2).

5. The overvoltage monitoring device for ultra-high voltage power grid based on Rogowski coil according to claim 1, characterized in that, The opposite sides of the two limiting blocks (8) are flush with the opposite sides of the two movable blocks (7).

6. The overvoltage monitoring device for an extra-high voltage power grid based on a Rogowski coil according to claim 5, wherein Among the two groups of limiting blocks (8), the length of the group of limiting blocks (8) located below is shorter than the length of the group of limiting blocks (8) located above.

7. The overvoltage monitoring device for an extra-high voltage power grid based on a Rogowski coil according to claim 3, characterized in that, A sliding groove (16) is opened on the outer wall of the fixed shell (2), and the dial rod (14) slides in the sliding groove (16).

8. The overvoltage monitoring device for an extra-high voltage power grid based on a Rogowski coil according to claim 7, characterized in that, A baffle (17) is fixedly connected to the outer wall of the dial rod (14), and the length of the baffle (17) is greater than twice the length of the sliding groove (16).

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