Adjustable overvoltage on-line intelligent detection device

Abstract

The invention discloses an adjustable overvoltage online intelligent detection device, which relates to the field of overvoltage detection, and comprises a main body shell in which a detection unit is arranged, a storage bin in which a plurality of storage seats are arranged for storing a plurality of functional modules, a connection base in which a magnet A is mounted, and a conductive contact on one side of the connection base, one side of the plug module is provided with an ejector pin, another magnet B is arranged in the ejector pin, the limiting mechanism is used for limiting the movement of the connecting base, and the locking mechanism comprises a calibration block and a calibration groove which are respectively mounted on the opposite sides of the connecting base and the plug module; through the magnetic attraction effect of the magnet A and the magnet B, the function module and the plug module are automatically aligned and locked, manual adjustment steps are reduced, the butt joint efficiency and reliability are improved, plug butt joint is divided into two stages of preliminary attraction and accurate conduction by utilizing the cooperation of the calibration block and the calibration groove, accurate contact between the ejector pin and the conductive contact is ensured, and the safety of the plug is improved. And the conduction failure caused by offset is avoided.

Description

Technical Field

[0001] The invention relates to an overvoltage detection technology, and in particular to an adjustable overvoltage online intelligent detection device. Background Art

[0002] With the increasing complexity of power systems, the importance of overvoltage detection devices in power grid monitoring has become increasingly prominent. In the prior art, overvoltage detection equipment mostly adopts a fixed plug design, which is difficult to adapt to various detection scenarios. For example, a Chinese patent with publication number CN116577547B discloses an overvoltage monitor that switches between plug types such as electric clips, USB connectors, and electric pens by turning a handle, and uses an air bag and a sliding block to achieve automatic power-on.

[0003] However, this solution has the following shortcomings: the handle needs to be turned frequently during operation, which can easily cause structural wear and may lead to poor contact after long-term use; the plug is fixedly connected to the detection unit, making it difficult to quickly replace or expand the functional module. In addition, the traditional detection device needs to adjust its position multiple times during the plugging and unplugging process, and the operation is cumbersome. Therefore, there is an urgent need for an overvoltage online detection device with high-precision docking, modular expansion and anti-oxidation. Summary of the invention

[0004] The purpose of the present invention is to provide an adjustable overvoltage online intelligent detection device to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: an adjustable overvoltage online intelligent detection device, comprising a main body shell, a detection unit is arranged in the main body shell, and further comprising: A storage bin is provided with a plurality of storage seats for storing a plurality of functional modules. The functional module is composed of a connection base and a functional head. A magnet A is installed in the connection base. A conductive contact is provided on one side of the connection base. A plug module, one side of which is provided with a ejector pin and another magnet B is provided therein; A limiting mechanism, which is arranged on one side of the storage seat and is used to limit the movement of the connection base; A locking mechanism, comprising a calibration block and a calibration slot respectively mounted on opposite sides of the connection base and the plug module, the locking mechanism having a first unlocked state and a second unlocked state, in which the calibration block abuts against an edge of the calibration slot, and the plug module and the storage seat can rotate relative to each other, and in the second unlocked state, the calibration block is embedded in the calibration slot, and the ejector pin contacts and conducts with the conductive contact; During detection, the plug module moves axially along the storage seat and first acts on the limit mechanism to release the restriction on the connection base. Magnet B acts on magnet A to move the functional module to the first unlocked state, and the plug module is rotated to move the functional module to the second unlocked state.

[0006] Furthermore, the calibration block has a protrusion, and the calibration groove has a groove corresponding to the protrusion. When the plug module and the storage seat rotate relatively, only one position can be docked so that the calibration block can enter the calibration groove.

[0007] Furthermore, the limiting mechanism includes a limiting rod and a trigger rod, a first sliding groove for sliding the limiting rod is opened in the storage seat, the end of the limiting rod is located on the inner side of the storage seat, a limiting groove adapted to the end of the limiting rod is opened on the circumference of the connecting base, a first spring is installed in the first sliding groove, the elastic force of the first spring acts on the limiting rod so that the limiting rod has a tendency to move toward the inner side of the storage seat, a sliding cavity for moving the trigger rod is opened in the limiting rod, the trigger rod and the limiting rod are abutted by an inclined slope portion, and when the trigger rod is pressed, it pushes the limiting rod to compress the first spring.

[0008] Furthermore, a spring sheet is installed between the trigger rod and the storage seat.

[0009] Furthermore, the locking mechanism also includes a locking groove opened on the inner side of the storage seat, the locking groove consists of a first groove, a second groove and a third groove, the first groove and the third groove are both arranged axially along the storage seat, the end of the first groove is located at the end face of the storage seat, the second groove connects the first groove and the third groove, and a locking shaft is arranged on the circumferential side of the connecting base, and the locking shaft can move along the locking groove.

[0010] Furthermore, the ejector pin is slidably connected to the inner wall of the plug module, a second spring is provided between the ejector pin and the plug module, and the elastic force of the second spring acts on the ejector pin to make it tend to move away from the plug module.

[0011] Furthermore, a friction plate is provided on one side of the connecting base, and the friction plate is installed on an arc seat. The arc seat is slidably connected to the inner wall of the connecting base through a guide rod. An arc groove is opened on one side of the connecting base, and the arc groove is located between adjacent conductive contacts. The arc seat can move into the arc groove, and a third spring is sleeved on the guide rod.

[0012] Furthermore, the detection unit includes a differential amplifier circuit and a signal conditioning circuit, and the differential amplifier circuit and the signal conditioning circuit are used to cooperate with the plug module and the functional module after being turned on to perform online detection of overvoltage; The differential amplifier circuit includes an equivalent mutual capacitance C m1 , equivalent mutual capacitance C m2 , mutual capacitance C m0 , stray capacitance to ground C s1 , stray capacitance to ground C s2 , Impedance R mand the differential amplifier, the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 Electrically connected, the mutual capacitance C m0 In series with the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 Between, the impedance R m The mutual capacitance C m0 The two ends are electrically connected, and the input end of the differential amplifier is connected to the impedance R m The stray capacitance C s1 One end is electrically connected to the mutual capacitance C m0 and the equivalent mutual capacitance C m1 Between, the stray capacitance to ground C s1 The other end is grounded, and the stray capacitance C s2 One end is electrically connected to the mutual capacitance C m0 and the equivalent mutual capacitance C m2 Between, the stray capacitance to ground C s2 The other end is grounded, and the differential amplifier circuit is electrically connected to the signal conditioning circuit.

[0013] Furthermore, the stray capacitance to ground C s1 and mutual capacitance C m0 and the equivalent mutual capacitance C m1 The connection position is node ②, the stray capacitance to ground C s2 Mutual capacitance C m0 and the equivalent mutual capacitance C m2 The connection position is node ③, the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 The middle connection position is node ①, and the node ① is the potential of the conductor under test, and its potential is U i Node ② and node ③ are the output potentials of two measuring electrodes with different equivalent areas, and their potential difference is U o .

[0014] Furthermore, the node equation transfer functions of the nodes ①, ② and ③ are: (1); Where: ; ; Among them, the amplitude-frequency characteristic in the node equation transfer function is: (2); The phase-frequency characteristic in the node equation transfer function is: (3); Where ω is the frequency.

[0015] Compared with the prior art, the adjustable overvoltage online intelligent detection device provided by the present invention has the following beneficial effects: 1. This adjustable overvoltage online intelligent detection device automatically aligns and locks the functional module and the plug module through the magnetic attraction of magnet A and magnet B, reducing manual adjustment steps and improving docking efficiency and reliability. By using the coordination of the calibration block and the calibration slot, the plug docking is divided into two stages: initial adsorption and precise conduction, ensuring the precise contact between the ejector pin and the conductive contact to avoid conduction failure caused by offset; there are multiple replaceable functional modules (such as electric clamps, probes, etc.) in the storage bin, which can be quickly replaced according to needs by users to adapt to complex detection scenarios; 2. This adjustable online overvoltage intelligent detection device automatically removes the oxide layer on the contact surface through the scraping movement of the friction plate and the ejector pin, ensuring the conductivity stability for long-term use; 3. The adjustable overvoltage online intelligent detection device uses the limit mechanism and the locking groove to fix the functional module when not in use, preventing displacement caused by transportation or vibration and improving the durability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a storage base, a functional module and a plug module provided in an embodiment of the present invention; Figure 3 A schematic diagram of a structure of a functional module and a storage base in a separated state provided by an embodiment of the present invention; Figure 4 A schematic diagram of a structure in which the protrusion on the calibration block provided in an embodiment of the present invention is in a flange shape and a cylindrical shape; Figure 5 A schematic diagram of the structure of a limiting mechanism provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a connection base and a plug module when a friction plate is provided in an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a cylindrical storage bin provided in an embodiment of the present invention; Figure 8A schematic diagram of the structure of a differential amplifier circuit provided in an embodiment of the present invention; Fig. 9 A schematic diagram of a PCB structure of multiple annular parallel electrodes provided in an embodiment of the present invention.

[0018] Description of reference numerals: 1. Main body shell; 2. Storage compartment; 21. Storage seat; 22. Functional module; 221. Connection base; 222. Functional head; 223. Conductive contact; 224. Friction plate; 225. Arc seat; 226. Guide rod; 227. Arc groove; 228. Third spring; 23. Door panel; 24. Rotary button; 3. Plug module; 31. Ejector pin; 32. Second spring; 33. Press ring; 34. Rotating part; 4. Limit Mechanism; 41. limit rod; 42. trigger rod; 43. first slide groove; 44. limit groove; 45. first spring; 46. sliding cavity; 47. inclined portion; 48. spring sheet; 5. locking mechanism; 51. calibration block; 52. calibration groove; 53. raised portion; 531. flange; 532. cylinder; 54. groove; 55. locking groove; 551. first groove; 552. second groove; 553. third groove; 56. locking shaft. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. Example

[0020] See also Figure 1 - Figure 7 , an adjustable overvoltage online intelligent detection device, comprising a main body shell 1, a detection unit is arranged in the main body shell 1, and also includes: The storage bin 2 has a plurality of storage seats 21 therein for storing a plurality of functional modules 22. The functional module 22 is composed of a connection base 221 and a functional head 222. A magnet A (not shown) is installed in the connection base 221. A conductive contact 223 is provided on one side of the connection base 221. The plug module 3 has a pin 31 disposed on one side thereof and another magnet B (not shown in the figure) disposed therein; A limiting mechanism 4, which is arranged on one side of the storage seat 21 and is used to limit the movement of the connecting base 221; The locking mechanism 5 comprises a calibration block 51 and a calibration groove 52 respectively mounted on opposite sides of the connection base 221 and the plug module 3. The locking mechanism 5 has a first unlocking state and a second unlocking state. In the first unlocking state, the edges of the calibration block 51 and the calibration groove 52 abut against each other, and the plug module 3 and the storage seat 21 can rotate relative to each other. In the second unlocking state, the calibration block 51 is embedded in the calibration groove 52, and the ejector pin 31 contacts and conducts with the conductive contact 223. During detection, the plug module 3 moves axially along the storage seat 21 and first acts on the limiting mechanism 4 to release the restriction on the connecting base 221. The magnet B acts on the magnet A to move the functional module 22 to the first unlocked state. The plug module 3 is rotated to move the functional module 22 to the second unlocked state.

[0021] like Figure 1 As shown, the storage bin 2 can carry multiple functional modules 22, and the connection bases 221 of the functional modules 22 are the same, but the functional heads 222 are different. The functional heads 222 can be matched according to the actual needs to be detected, such as electric clips, USB and probes, etc. The storage bin 2 can be installed with an independent door panel 23, so as to enclose each functional module 22 in the main shell 1. The storage bin 2 can also be set as a cylindrical 532-shaped bin body, such as Figure 7 As shown, by rotating the rotary button 24, the multiple functional modules 22 inside can be rotated to the door panel 23 of the cylindrical 532-shaped warehouse body in sequence. After the door panel 23 is opened, the plug module 3 and the functional module 22 can be connected.

[0022] like Figure 2 As shown, the function of the limiting mechanism 4 is to fix the functional module 22 located in the storage seat 21, so that it can stably limit the movement of the functional module 22, and avoid shaking or position displacement of the functional module 22 during movement or transportation, which affects the subsequent detection operation. When the plug module 3 needs to be connected with one of the functional modules 22, the plug module 3 is first moved toward the functional module 22, and the limiting mechanism 4 is triggered to release the restriction on the connection base 221. At this time, the magnet A and the magnet B attract each other, so that the functional module 22 moves a certain distance in the direction of the plug module 3, and the plug module 3 will be preliminarily connected with the functional module 22, and the calibration block 51 and the calibration slot 5 are affected. 2, when the calibration block 51 and the calibration groove 52 cannot be docked and embedded, the movement of the functional module 22 is not enough to make the ejector pin 31 abut against the surface of the connecting base 221, and for the ejector pin 31 and the conductive contact 223, the two are not in a state where they can be directly connected. On the same radial section, the two are staggered at a certain angle, and then the plug module 3 is rotated. When the calibration block 51 is docked with the calibration groove 52, the ejector pin 31 also corresponds to the conductive contact 223. Under the action of the magnet, the functional module 22 can be moved again. Finally, the functional module 22 will be tightly connected to the plug module 3, and the ejector pin 31 and the conductive contact 223 will also be connected. Then it can be taken out for corresponding detection.

[0023] In this embodiment, if Figure 2 and Figure 4As shown, the calibration block 51 has a protrusion 53, and the calibration groove 52 has a groove 54 corresponding to the protrusion 53. When the plug module 3 and the storage seat 21 rotate relative to each other, only one position can be docked so that the calibration block 51 can enter the calibration groove 52. Figure 4 The raised portion 53 may be a flange 531 on the circumferential side of the calibration block 51, or a cylinder 532 provided on the side of the calibration block 51. The cylinder 532 should be located at a position deviating from the center of the calibration block 51. Through the arrangement of the calibration block 51 and the calibration groove 52, the docking process between the functional module 22 and the plug module 3 is divided into two stages. The first stage is the initial connection state. The functional module 22 and the plug module 3 are connected at a certain distance to provide an operating space for the subsequent docking and conduction between the conductive contact 223 and the ejector pin 31, which is the second stage. In the second stage, the plug module 3 is rotated. The functional module 22 is relatively still at this time. When the calibration groove 52 is docked and embedded with the calibration block 51, it means that the conductive contact 223 and the ejector pin 31 are aligned in the axial direction of the storage seat 21. Under the arrangement of the magnet, the functional module 22 will move again and complete the connection with the plug module 3. In this embodiment, the limiting mechanism 4 includes a limiting rod 41 and a trigger rod 42. A first sliding groove 43 is provided in the storage seat 21 for the limiting rod 41 to slide. The end of the limiting rod 41 is located on the inner side of the storage seat 21. A limiting groove 44 adapted to the end of the limiting rod 41 is provided on the peripheral side of the connecting base 221. A first spring 45 is installed in the first sliding groove 43. The elastic force of the first spring 45 acts on the limiting rod 41 so that the limiting rod 41 has a tendency to move toward the inner side of the storage seat 21. A sliding cavity 46 for the trigger rod 42 to move is provided in the limiting rod 41. The trigger rod 42 abuts against the limiting rod 41 through an inclined slope 47. When the trigger rod 42 is pressed, it pushes the limiting rod 41 to compress the first spring 45. like Figure 5 As shown, when the two trigger rods 42 are pushed by the moving plug module 3, the trigger rod 42 moves and pushes the limit rod 41 to move, so that the limit rod 41 is away from the connection base 221. At this time, the limit mechanism 4 releases the restriction on the connection base 221. Under the suction of the magnet, the connection base 221 moves a certain distance. If the ejector pin 31 and the conductive contact 223 are aligned at this time, they directly enter the second state. If they are not aligned, the connection base 221 will only move a certain distance, so that subsequent adjustments, in this embodiment, the relative position of the ejector pin 31 and the conductive contact 223 can be adjusted by rotating the plug module 3.

[0024] It should be noted that in order to improve the stability of repeated use of the trigger rod 42, a spring sheet 48 is installed between the trigger rod 42 and the storage seat 21. The spring sheet 48 provides power for resetting the trigger rod 42, so that when the functional module 22 returns to the storage seat 21, it can be limited and fixed.

[0025] In this embodiment, the locking mechanism 5 further includes a locking groove 55 provided on the inner side of the storage seat 21, the locking groove 55 is composed of a first groove 551, a second groove 552 and a third groove 553, the first groove 551 and the third groove 553 are both arranged axially along the storage seat 21, the end of the first groove 551 is located at the end surface of the storage seat 21, the second groove 552 communicates with the first groove 551 and the third groove 553, and a locking shaft 56 is provided on the peripheral side of the connection base 221, and the locking shaft 56 can move along the locking groove 55; like Figure 5 As shown, when the functional module 22 is located in the storage bin 2, the locking shaft 56 is located at the bottom of the third slot 553, and at this time the connecting base 221 is limited by the limiting mechanism 4, and the functional module 22 is stably limited on the storage base 21; When in use, the staff first moves the plug module 3 to the functional module 22 to be connected, and the pressing ring 33 on the plug module 3 first pushes the trigger rod 42 to move, so that the trigger rod 42 drives the limit rod 41 to move so that the limit rod 41 releases the restriction on the connection base 221. At this time, the connection base 221 is restricted by the locking groove 55 and the locking shaft 56, and can move along the axial direction of the storage seat 21; Under the setting of magnets A and B, the connection base 221 will move toward the plug module 3, and the locking shaft 56 will also move in the third groove 553, but will be restricted by the calibration block 51 and the calibration groove 52. If the calibration block 51 and the calibration groove 52 are not directly embedded, the locking shaft 56 will still be in the third groove 553. That is to say, at this time, the locking shaft 56 on the connection base 221 can only move along the third groove 553 but cannot move along the second groove 552, and the connection base 221 cannot rotate, that is, it reaches the first unlocking state; The staff rotates the plug module 3, and the rotating part 34 installed on the plug module 3 assists the rotation. Under the suction of the magnet, the plug module 3 and the functional module 22 always have a tendency to approach each other. Under this tendency, the rotation of the plug module 3 will complete the embedding of the calibration block 51 and the calibration groove 52 at a certain position, and once the two can be embedded, it means that the positions of the ejector pin 31 and the conductive contact 223 have been aligned and are conductive. After the calibration block 51 and the calibration groove 52 are embedded, the functional module 22 will approach the plug module 3 again, and the locking shaft 56 will also move to the intersection of the second groove 552 and the third groove 553, that is, it reaches the second unlocking state; In the second unlocked state, the staff rotates the plug module 3 to drive the functional module 22 to rotate together. At this time, the locking shaft 56 needs to be rotated to the intersection of the second groove 552 and the first groove 551, and then directly pulled out to complete the connection and conduction process between the plug module 3 and the functional module 22, and then the corresponding overvoltage detection can be performed; After the inspection is completed, the staff moves the plug module 3 to the original storage seat 21 for disassembly. When disassembling, the locking shaft 56 needs to be aligned with the entrance of the locking groove 55. This process can be achieved by rotating the plug module 3 while applying pressure, and then the locking shaft 56 is rotated to the intersection of the second groove 552 and the third groove 553 to pull out the plug module 3, and then the connection base 221 is manually pressed to complete the limit through the limit mechanism 4; It should be noted that the magnet B in the plug module 3 can also be set to be flippable, that is, the magnet B can be flipped to change the direction of its magnetic pole, so that the original mutual attraction between it and the magnet A becomes mutual repulsion. When the locking shaft 56 moves to the second groove 552, the magnet B can be flipped to repel the magnet A, so that the connecting base 221 has a tendency to move away from the plug module 3. When the locking shaft 56 moves to the third groove 553, under the action of the repulsive force, the connecting base 221 moves to a position where it can be limited by the limiting mechanism 4. After moving out of the plug module 3, the limiting mechanism 4 can be reset to limit the connecting base 221. The way to flip the magnet B can be to rotate the magnet B in the plug module 3 through the rotating shaft, and change the magnetic pole by rotating the rotating shaft. The magnet B can also be set as an electromagnet.

[0026] The ejector pin 31 is slidably connected to the inner wall of the plug module 3, and a second spring 32 is provided between the ejector pin 31 and the plug module 3. The elastic force of the second spring 32 acts on the ejector pin 31 to make it tend to move away from the plug module 3. A friction plate 224 is provided on one side of the connection base 221, and the friction plate 224 is installed on the arc seat 225. The arc seat 225 is slidably connected to the inner wall of the connection base 221 through a guide rod 226. An arc groove 227 is opened on one side of the connection base 221, and the arc groove 227 is located between adjacent conductive contacts 223. The arc seat 225 can move into the arc groove 227, and a third spring 228 is sleeved on the guide rod 226. like Figure 6As shown, since the ejector pin 31 is generally in an external environment that is easily oxidized, this may easily lead to poor contact between the ejector pin 31 and the conductive contact 223, affecting the detection result. Therefore, through the friction plate 224, when in the second unlocked state, the rotation of the plug module 3 will drive the ejector pin 31 to scrape on the friction plate 224, so that the oxide layer that may exist at the contact portion between the ejector pin 31 and the conductive contact 223 is removed, thereby ensuring good contact. It should be understood that the adsorption force between the magnets is greater than the force of the third spring 228 and the second spring 32, that is, the adsorption force of the magnets still meets the use requirements in the presence of the second spring 32 and the third spring 228.

[0027] Embodiment 2: See also Figure 8 and Fig. 9 This embodiment provides a technical solution based on the first embodiment: the detection unit includes a differential amplifier circuit and a signal conditioning circuit, the differential amplifier circuit and the signal conditioning circuit are used to cooperate with the plug module and the functional module after the conduction to perform online detection of overvoltage, the differential amplifier circuit includes an equivalent mutual capacitance C m1 , equivalent mutual capacitance C m2 , mutual capacitance C m0 , stray capacitance to ground C s1 , stray capacitance to ground C s2 , Impedance R m and differential amplifier, equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 Electrical connection, mutual capacitance C m0 In series with the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 Between, impedance R m The mutual capacitance C m0 The two ends are electrically connected, and the input end of the differential amplifier is connected to the impedance R m Both ends, stray capacitance to ground C s1 One end is electrically connected to the mutual capacitance C m0 and the equivalent mutual capacitance C m1 Between, stray capacitance to ground C s1 The other end is grounded, and the stray capacitance C s2 One end is electrically connected to the mutual capacitance C m0 and the equivalent mutual capacitance C m2 Between, stray capacitance to ground C s2 The other end is grounded, and the differential amplifier circuit is electrically connected to the signal conditioning circuit.

[0028] Stray capacitance to ground C s1 and mutual capacitance C m0 and the equivalent mutual capacitance C m1 The connection position is node ②, and the stray capacitance to ground Cs2 Mutual capacitance C m0 and the equivalent mutual capacitance C m2 The connection position is node ③, and the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 The middle connection position is node ①, and node ① is the potential of the conductor being measured, and its potential is U i Nodes ② and ③ are the output potentials of two measuring electrodes with different equivalent areas, and their potential difference is U o .

[0029] The node equation transfer function of nodes ①, ② and ③ is: (1); Where: ; ; Among them, the amplitude-frequency characteristics in the node equation transfer function are: (2); The phase-frequency characteristics in the node equation transfer function are: (3); Where ω is the frequency; In summary, node ① is the potential of the conductor being measured, and nodes ② and ③ are the output potentials of two measuring electrodes with different equivalent areas. The floating potentials of nodes ② and ③ are input into the differential amplifier, and the input potential difference is U o . Among them, C m1 , C m2 are the equivalent mutual capacitances between the two electrodes and the conductor being measured, C s1 , C s2 are the stray capacitances of the two electrodes to the ground, R m is the input impedance of the differential amplifier, and there will be a mutual capacitance C between the electrodes. m0 , it can be seen from the formula that increasing the mutual capacitance C m0 The value of will make the transformer work in the self-integration mode at the power frequency. At the same time, since the integrated operational amplifier itself has a very high input impedance, it is easier for this structure to achieve R m The self-integration condition of C2>>1. By increasing C m0 The value of will also increase the transformer voltage division ratio and reduce the phase difference. Directly inputting the output voltage to the amplifier in a differential manner can achieve self-integration while eliminating the load resistance, thereby avoiding a series of problems caused by the load resistance; Combination Figure 8 and Fig. 9 The overall structure is a multi-ring parallel electrode structure, which can maximize the C m0value to achieve a higher voltage division ratio and a smaller phase difference; by processing the electrode into a printed circuit board, it can achieve higher precision while improving the insulation level and standardizing the parameters of each PCB. Its structure is as follows Fig. 9 shown.

[0030] exist Fig. 9 In the present invention, the top and bottom layers of the PCB are provided with a plurality of annular electrodes of different radii, and the annular electrodes of the top and bottom layers are connected in parallel. The present invention is composed of a plurality of PCBs stacked closely in sequence, and the annular electrodes of the top and bottom layers of each PCB are connected in parallel. That is, the potentials of the top and bottom electrodes are respectively Figure 8 The potential of the middle node ② and node ③ is output as the potential difference between the top electrode and the bottom electrode. The annular electrode is a perfect circle, and its Gaussian surface is orthogonal to the electric field strength, which can increase the equivalent area of ​​the electrode to the conductor being measured, thereby improving the sensitivity of the mutual inductor. At the same time, the perfect circle ring structure is similar to the electric field equipotential surface around the conductor being measured, which can make the charge distribution on the electrode uniform, while reducing the local electric field maximum value that causes insulation breakdown, and minimize the edge effect to the greatest extent, reducing the electric field distortion caused by the electrode. Since there is mutual capacitance between all electrodes, after parallel superposition, C m0 Get a larger capacitance value.

[0031] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the present invention.

Claims

1. An adjustable overvoltage online intelligent detection device, comprising a main body shell, in which a detection unit is arranged, characterized in that: Also includes: A storage bin is provided with a plurality of storage seats for storing a plurality of functional modules. The functional module is composed of a connection base and a functional head. A magnet A is installed in the connection base. A conductive contact is provided on one side of the connection base. A plug module, one side of which is provided with a ejector pin and another magnet B is provided therein; A limiting mechanism, which is arranged on one side of the storage seat and is used to limit the movement of the connection base; A locking mechanism, comprising a calibration block and a calibration slot respectively mounted on opposite sides of the connection base and the plug module, the locking mechanism having a first unlocked state and a second unlocked state, in which the calibration block abuts against an edge of the calibration slot, and the plug module and the storage seat can rotate relative to each other, and in the second unlocked state, the calibration block is embedded in the calibration slot, and the ejector pin contacts and conducts with the conductive contact; During detection, the plug module moves axially along the storage seat and first acts on the limit mechanism to release the restriction on the connection base. Magnet B acts on magnet A to move the functional module to the first unlocked state, and the plug module is rotated to move the functional module to the second unlocked state.

2. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The calibration block has a protrusion, and the calibration groove has a groove corresponding to the protrusion. When the plug module and the storage seat rotate relatively, only one position can be docked so that the calibration block can enter the calibration groove.

3. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The limiting mechanism includes a limiting rod and a trigger rod, a first sliding groove for sliding the limiting rod is opened in the storage seat, the end of the limiting rod is located on the inner side of the storage seat, a limiting groove adapted to the end of the limiting rod is opened on the circumference of the connecting base, a first spring is installed in the first sliding groove, the elastic force of the first spring acts on the limiting rod so that the limiting rod has a tendency to move toward the inner side of the storage seat, a sliding cavity for moving the trigger rod is opened in the limiting rod, the trigger rod and the limiting rod are abutted by an inclined slope portion, and when the trigger rod is pressed, it pushes the limiting rod to compress the first spring.

4. The adjustable online overvoltage intelligent detection device according to claim 3 is characterized in that: A spring sheet is installed between the trigger rod and the storage seat.

5. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The locking mechanism also includes a locking groove opened on the inner side of the storage seat, and the locking groove consists of a first groove, a second groove and a third groove. The first groove and the third groove are both arranged axially along the storage seat, and the end of the first groove is located at the end surface of the storage seat. The second groove connects the first groove and the third groove. A locking shaft is arranged on the circumferential side of the connecting base, and the locking shaft can move along the locking groove.

6. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The ejector pin is slidably connected to the inner wall of the plug module, and a second spring is arranged between the ejector pin and the plug module. The elastic force of the second spring acts on the ejector pin to make it tend to move away from the plug module.

7. The adjustable online overvoltage intelligent detection device according to claim 6 is characterized in that: A friction plate is provided on one side of the connecting base, and the friction plate is installed on the arc seat. The arc seat is slidably connected to the inner wall of the connecting base through a guide rod. An arc groove is opened on one side of the connecting base, and the arc groove is located between adjacent conductive contacts. The arc seat can move into the arc groove, and a third spring is sleeved on the guide rod.

8. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The detection unit includes a differential amplifier circuit and a signal conditioning circuit, and the differential amplifier circuit and the signal conditioning circuit are used to cooperate with the plug module and the functional module after being turned on to perform online detection of overvoltage; The differential amplifier circuit includes an equivalent mutual capacitance C m1 , equivalent mutual capacitance C m2 , mutual capacitance C m0 , stray capacitance to ground C s1 , stray capacitance to ground C s2 , Impedance R m and the differential amplifier, the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 Electrically connected, the mutual capacitance C m0 In series with the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 Between, the impedance R m The mutual capacitance C m0 The two ends are electrically connected, and the input end of the differential amplifier is connected to the impedance R m The stray capacitance C s1 One end is electrically connected to the mutual capacitance C m0 and the equivalent mutual capacitance C m1 Between, the stray capacitance to ground C s1 The other end is grounded, and the stray capacitance C s2 One end is electrically connected to the mutual capacitance C m0 and the equivalent mutual capacitance C m2 Between, the stray capacitance to ground C s2 The other end is grounded, and the differential amplifier circuit is electrically connected to the signal conditioning circuit.

9. The adjustable online overvoltage intelligent detection device according to claim 8, characterized in that: The stray capacitance to ground C s1 and mutual capacitance C m0 and the equivalent mutual capacitance C m1 The connection position is node ②, the stray capacitance to ground C s2 Mutual capacitance C m0 and the equivalent mutual capacitance C m2 The connection position is node ③, the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 The middle connection position is node ①, and the node ① is the potential of the conductor under test, and its potential is U i Node ② and node ③ are the output potentials of two measuring electrodes with different equivalent areas, and their potential difference is U o .

10. The adjustable online overvoltage intelligent detection device according to claim 9, characterized in that: The node equation transfer functions of the nodes ①, ② and ③ are: （1）； Where: ； Among them, the amplitude-frequency characteristic in the node equation transfer function is: （2）； The phase-frequency characteristic in the node equation transfer function is: （3）； Where ω is the frequency.

Images