A lightning arrester with overvoltage and undervoltage protection

Abstract

The present invention provides a lightning arrester with overvoltage and undervoltage protection, which relates to the technical field of lightning arresters, including an installation base plate and a lightning arrester body, the installation base plate and the lightning arrester body are provided with a fixing mechanism for fixing the installation base plate and the lightning arrester body, the fixing mechanism is provided with a limiting mechanism for limiting the fixing mechanism, the fixing mechanism includes a fixed side plate, a top plate and a pulling rod, the limiting mechanism includes an arc-shaped limiting block, the number of the fixed side plates is two, the two fixed side plates are respectively fixedly installed on the two side ends of the lightning arrester body, the upper ends of the two fixed side plates are penetrated by two circular grooves, and the inner side wall of each circular groove is rotatably installed with a threaded rod. The present invention can provide sufficient time for input side clamping by adding inductance or line inductance and incorporating a decoupling function, effectively cut off the high-frequency pulse voltage, and greatly reduce the lightning residual voltage value of the output port.

Description

Technical Field

[0001] The present invention belongs to the technical field of lightning arresters, and more specifically, particularly relates to a lightning arrester with overvoltage and undervoltage protection. Background Art

[0002] At present, common fault phenomena in low-voltage power supply systems include circuit breakage, reverse connection of phase and neutral lines, and serious imbalance of three-phase load, which lead to overvoltage or undervoltage in single-phase power supply systems, causing damage to electrical equipment and causing users to suffer great economic losses. Overvoltage is mainly due to the principles of electrostatic induction and electromagnetic induction of lightning, which induces lightning overvoltage on the transmission line. These lightning overvoltages are introduced into electrical equipment through cables, causing damage to the equipment.

[0003] At present, there are several forms of overvoltage and undervoltage protection products at home and abroad:

[0004] 1. Surge protectors are used to suppress lightning overvoltage. They need to be installed independently on electrical equipment. They are usually installed at the front end of the protected electrical equipment to release the energy of lightning waves.

[0005] 2. Overvoltage and undervoltage protectors often use single-electric surge protectors, which generally have a small output current of about 10A.

[0006] 3. The small circuit breaker is equipped with undervoltage and overvoltage releases. Its advantages are easy implementation, low energy consumption and convenient installation. Its disadvantage is that after the protection action, the power grid power supply returns to normal and cannot be closed automatically, and manual operation is required;

[0007] 4. Fully automatic voltage protector: When the power supply voltage in the circuit exceeds the artificial limit allowed by the electrical equipment, it automatically disconnects the power supply to protect the electrical equipment from damage caused by overvoltage or undervoltage. However, it does not have the ability to suppress lightning overvoltage when lightning overvoltage occurs on the power supply line.

[0008] In the prior art, the devices for overvoltage and undervoltage protection have the following disadvantages:

[0009] 1. When lightning overvoltage occurs in the power system, if the energy in the lightning wave cannot be effectively released and the lightning overvoltage cannot be suppressed, the electrical equipment will be struck by lightning, thus causing equipment damage. This damage may be caused by the large amount of energy carried by lightning directly hitting the equipment, or by the electromagnetic interference caused by lightning overvoltage on the equipment, making the equipment unable to work normally or even permanently damaged;

[0010] 2. When the power supply line voltage is abnormal due to some specific reasons, such as overvoltage or undervoltage, if the device cannot automatically cut off the power supply line, the voltage exceeds this range, the equipment may not work properly, and the electrical equipment may be damaged due to such overvoltage or undervoltage;

[0011] 3. When the voltage in the power supply is successfully restored to normal, if the automatic reset mechanism cannot be realized within the preset time period, then this will inevitably affect the continuous and stable operation of the electrical equipment. This phenomenon of failure to automatically reset may not only lead to a decline in equipment performance, but may even cause equipment failure, thus affecting the safety and reliability of the entire power system;

[0012] 4. Due to the aging failure of ordinary varistors and the potential threat of transient overvoltage, some consequences may be caused. When the performance of the varistor degrades or even fails due to long-term use or environmental factors, the stability of the device will be seriously affected; it will not only cause the internal temperature of the device to rise abnormally, causing overheating, but may even trigger a fire, leading to a combustion accident.

[0013] Therefore, in view of this, the existing structure and defects are studied and improved, and a lightning arrester with overvoltage and undervoltage protection is provided, in order to achieve a more practical purpose. Summary of the invention

[0014] In order to solve the above technical problems, the present invention provides a lightning arrester with overvoltage and undervoltage protection to solve the above problems.

[0015] A lightning arrester with overvoltage and undervoltage protection, comprising an installation base plate and a lightning arrester body, the lightning arrester body comprising a lightning protection unit module, a power supply and voltage sampling module, an upper and lower limit voltage comparison module, an over-undervoltage time delay recovery module, and a drive and status indication module, the installation base plate and the lightning arrester body are provided with a fixing mechanism for fixing the installation base plate and the lightning arrester body, the fixing mechanism is provided with a limiting mechanism for limiting the fixing mechanism, the fixing mechanism comprises a fixed side plate, a top plate and a pulling rod, the limiting mechanism comprises an arc-shaped limiting block, the number of the fixed side plates is two, the two fixed side plates are fixedly mounted on the two side ends of the lightning arrester body, the upper ends of the two fixed side plates are penetrated by two circular grooves, the inner side walls of each circular groove are rotatably mounted with a threaded rod, each of the top plates is fixedly mounted on the upper end of the threaded rod, and each of the two side ends of the top plate is fixedly mounted with an L-shaped fixing block, the number of the arc-shaped limiting blocks is multiple, each of the arc-shaped limiting blocks is located on one side of the L-shaped fixing block, the installation base plate A mounting slot hole is provided at the upper end portion, a plurality of threaded slots are also provided at the upper end portion of the mounting base plate, a plurality of first limiting slots are provided at the upper end portion of the mounting base plate, the first limiting slots are in groups of two, and each group of the first limiting slots is located at the circumferential end portion of the threaded slot, wiring slots are penetrated at both side ends of the lightning arrester body, circular slots are penetrated at the upper ends of the two fixed side plates, and a plurality of second limiting slots are also penetrated at the upper ends of the two fixed side plates, the second limiting slots are in groups of two, and each group of the second limiting slots is located at the circumferential end portion of the circular slot, two circular slots are penetrated at the upper end portion of each top plate, a mounting rectangular plate is fixedly installed at the side end portion of each arc-shaped limiting block, a first spring is fixedly installed between each mounting rectangular plate and the L-shaped fixing block, a telescopic rod is also fixedly installed between each mounting rectangular plate and the L-shaped fixing block, and each telescopic rod is located at the inner side wall of the first spring, the number of the pull rods is multiple, and two limiting plug rods are fixedly installed at the lower end portion of each pull rod.

[0016] Preferably, two second springs are fixedly installed between each of the pulling rods and the top plate.

[0017] Preferably, an arc-shaped slot is formed at the circumferential end of each of the limiting insert rods, and the size of each of the arc-shaped limiting blocks matches the arc-shaped slot.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present invention, a self-resetting temperature fuse and a varistor combination or a single temperature fuse type varistor TMOV is connected in series between each phase line to solve the problem that ordinary varistors may be damaged, heated, and catch fire due to aging failure and transient overvoltage. At the same time, a lightning surge protection circuit is used to integrate differential common mode protection.

[0020] In the present invention, by adding inductance or line inductance and incorporating a decoupling function, sufficient time can be provided for input side clamping, high-frequency pulse voltage can be effectively cut off, and the lightning residual voltage value of the output port can be greatly reduced.

[0021] In the present invention, the power supply can be cut off in time to avoid damage to the equipment due to overvoltage or undervoltage; when the grid voltage is higher than the set voltage (high threshold) or lower than the set voltage (low threshold), the product can cut off the power supply line, and the circuit automatically increases the low threshold or lowers the high threshold while the equipment stops working, avoiding the equipment from constantly starting and stopping at the critical point, causing damage.

[0022] In the present invention, by decomposing a single undervoltage point into an undervoltage protection point (V1) and an undervoltage recovery point (V2), the back-end circuit is not prone to repeated switching on and off near the undervoltage point, and the back-end circuit is not prone to repeated switching on and off near the overvoltage point.

[0023] In the present invention, by providing a hysteresis comparison, the number of times the device is repeatedly turned on and off is reduced, the probability of device damage is reduced, the reliability of the back-end circuit is improved, the service life of the device is indirectly increased, and the cost of product use is reduced.

[0024] In the present invention, by cooperating with a pull rod and a limit plug rod, each threaded rod can be fixed and limited after the lightning arrester body and the mounting base plate are installed, so as to avoid the threaded rod becoming loose during use, resulting in loose installation of the mounting base plate and the lightning arrester body, and to avoid increasing the mechanical stress and wear of the internal components, so that the mounting base plate and the lightning arrester body are firmly installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the installation base plate of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the lightning arrester body of the present invention;

[0027] Figure 3 It is a schematic diagram of the overall structure of the top plate of the present invention;

[0028] Figure 4 It is a schematic diagram of the overall structure of the arc-shaped limit block of the present invention;

[0029] Figure 5 It is a schematic diagram of the overall structure of the circuit of the present invention;

[0030] Figure 6 It is a schematic diagram of the overall structure of the process of the present invention;

[0031] Figure 7 It is a schematic diagram of the overall structure of the installation structure of the present invention.

[0032] In the figure, the correspondence between the component names and the figure numbers is: 1. Installation base plate; 11. Installation slot; 12. Threaded groove; 13. First limit groove; 2. Lightning arrester body; 21. Wiring groove; 3. Fixed side plate; 31. Round groove; 32. Second limit groove; 4. Top plate; 41. L-shaped fixing block; 42. Round slot; 43. Threaded rod; 5. Arc-shaped limit block; 51. Installation rectangular plate; 52. First spring; 53. Telescopic rod; 6. Pull rod; 61. Second spring; 62. Limiting plug rod; 63. Arc-shaped slot. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] See also Figure 1 - Figure 7 The present invention provides a lightning arrester with overvoltage and undervoltage protection, including a mounting base plate 1 and a lightning arrester body 2, wherein the lightning arrester body 2 includes a lightning protection unit module, a power supply and voltage sampling module, an upper and lower limit voltage comparison module, an over-undervoltage time delay recovery module, and a drive and status indication module. The lightning protection circuit of the present application adopts LN, L-PE, and N-PE full protection modes, and a self-recovery type temperature fuse and a varistor combination or a single temperature insurance type varistor TMOV is respectively arranged in series between each phase line, which solves the problem that ordinary varistors will be damaged, heated, and ignited due to aging failure and transient overvoltage, and at the same time, the lightning surge protection circuit is used;

[0035] The power grid over- and under-voltage protection circuit module can cut off the power supply in time for overvoltage and undervoltage caused by power grid fluctuations, overvoltage and undervoltage in the process of suburban power grid dispatching, and overvoltage and undervoltage generated at the moment of equipment power-on, so as to avoid damage to the equipment caused by overvoltage or undervoltage; when the power grid voltage is higher than the set voltage or lower than the set voltage, the product can cut off the power supply line, and the circuit automatically increases the low threshold or reduces the high threshold while the equipment stops working;

[0036] The hysteresis comparison reduces the number of times the device is repeatedly turned on and off, reduces the probability of device damage, improves the reliability of the back-end circuit, indirectly increases the service life of the device, and reduces the cost of product use. The P-channel MOSFET is controlled on and off through the output of the comparator, and the multi-channel level values ​​are obtained through the main line op amp comparison;

[0037] The installation base plate 1 and the lightning arrester body 2 are provided with a fixing mechanism for facilitating the installation of the base plate 1 and the lightning arrester body 2, and the fixing mechanism is provided with a limiting mechanism for facilitating the limiting of the fixing mechanism, the fixing mechanism includes a fixed side plate 3, a top plate 4 and a pulling rod 6, the limiting mechanism includes an arc-shaped limiting block 5, the number of the fixed side plates 3 is two, and the two fixed side plates 3 are respectively fixedly installed on the two side ends of the lightning arrester body 2, and the upper ends of the two fixed side plates 3 are penetrated by two circular grooves 31, and the inner side wall of each circular groove 31 is rotatably installed with a threaded rod 43, and each top plate 4 is fixedly installed on the upper end of the threaded rod 43, and each side end of each top plate 4 is fixedly installed An L-shaped fixing block 41, a plurality of arc-shaped limit blocks 5, each arc-shaped limit block 5 is located on one side of the L-shaped fixing block 41, a mounting slot 11 is provided at the upper end of the mounting base plate 1, a plurality of threaded grooves 12 are also provided at the upper end of the mounting base plate 1, a plurality of first limit grooves 13 are provided at the upper end of the mounting base plate 1, the first limit grooves 13 are grouped in pairs, and each group of first limit grooves 13 is located at the circumferential end of the threaded groove 12, wiring grooves 21 are penetrated at both side ends of the lightning arrester body 2, circular grooves 31 are penetrated at the upper ends of the two fixed side plates 3, and a plurality of second limit grooves 32 are also penetrated at the upper ends of the two fixed side plates 3, and the second limit grooves 33 are formed at the upper ends of the two fixed side plates 3. The positioning grooves 32 are arranged in groups of two, and each group of second limiting grooves 32 is located at the circumferential end of the circular groove 31. Two circular slots 42 are penetrated at the upper end of each top plate 4, and a mounting rectangular plate 51 is fixedly installed on the side end of each arc-shaped limiting block 5. A first spring 52 is fixedly installed between each mounting rectangular plate 51 and the L-shaped fixing block 41. A telescopic rod 53 is also fixedly installed between each mounting rectangular plate 51 and the L-shaped fixing block 41. Each telescopic rod 53 is located on the inner side wall of the first spring 52. The first spring 52 will rebound, and the rebound of the first spring 52 drives the arc-shaped limiting block 5 to enter the inner side wall of the arc-shaped slot hole 63. At this time, the limiting plug rod 62 is The end of the limiting rod 62 will be located on the inner side wall of the circular slot 42. The user can pass the threaded rod 43 on the top plate 4 through the circular slot 31 and install it in the threaded slot 12 by rotating the thread. At this time, the fixed side plate 3 is fixed to the mounting base plate 1 through the threaded rod 43. The user can limit the threaded rod 43. The user can pull the arc-shaped limiting block 5 away from the inner side wall of the arc-shaped slot hole 63. At this time, the second spring 61 will rebound and drive the pull rod 6 to move downward. The downward movement of the pull rod 6 will drive the limiting rod 62 to move downward. The limiting rod 62 will move downward and enter the inner side wall of the first limiting slot 13, so as to limit the threaded rod 43 and prevent it from loosening.

[0038] There are multiple pull rods 6, and two limit rods 62 are fixedly installed at the lower end of each pull rod 6. Two second springs 61 are also fixedly installed between each pull rod 6 and the top plate 4. An arc-shaped slot 63 is opened at the circumferential end of each limit rod 62. The size of each arc-shaped limit block 5 matches the arc-shaped slot 63. When fixing the lightning arrester body 2 and the mounting base plate 1, the pull rod 6 can be moved upward first. The pull rod 6 moves upward to lengthen the second spring 61. The pull rod 6 moves upward to drive the two limit rods 62 to move upward. When the limit rod 62 moves upward, it drives the arc-shaped slot 63 to move upward and overlaps with the arc-shaped limit block 5.

[0039] Working principle:

[0040] In the first step, the lightning arrester body 2 includes a lightning protection unit module, a power supply and voltage sampling module, an upper and lower limit voltage comparison module, an over-voltage and under-voltage time delay recovery module, and a drive and status indication module. The lightning protection circuit of the present application adopts LN, L-PE, and N-PE full protection modes, and a self-recovery type temperature fuse and a varistor combination or a single temperature insurance type varistor TMOV is respectively arranged in series between each phase line, which solves the problem that ordinary varistors will be damaged, heated, and caught fire due to aging failure and transient overvoltage. At the same time, through the lightning surge protection circuit, integrated differential common mode protection, eliminates or reduces the lightning surge high voltage between the phase line and the neutral line to the ground, and eliminates or reduces the lightning surge high voltage between the phase line and the neutral line. By adding inductance or line body inductance and integrating decoupling function, sufficient time can be provided for the input side clamping voltage, effectively cutting off the high-frequency pulse voltage, and greatly reducing the output port lightning residual voltage value;

[0041] The second step is the over- and under-voltage protection circuit module of the power grid. For overvoltage and undervoltage caused by power grid fluctuations (voltage instability of the power supply line itself, large circuit load working current, short circuit in the power supply line, insufficient transformer capacity or failure), or overvoltage and undervoltage in the suburban power grid dispatching process, as well as overvoltage and undervoltage generated at the moment of equipment power-on, the product can cut off the power supply in time to avoid damage to the equipment caused by overvoltage or undervoltage; when the power grid voltage is higher than the set voltage (high threshold) or lower than the set voltage (low threshold), the product can cut off the power supply line, and the circuit automatically increases the low threshold or lowers the high threshold while the equipment stops working, to avoid the equipment from being continuously started and stopped at the critical point, causing damage;

[0042] The third step is to decompose the single undervoltage point into an undervoltage protection point (V1) and an undervoltage recovery point (V2). The voltages of the undervoltage protection point (V1) and the undervoltage recovery point (V2) can be set through the resistor R first limit slot 13, R14, R9, and R mounting base plate 1, so that the back-end circuit is not prone to repeated opening and closing near the undervoltage point. The single overvoltage is decomposed into an overvoltage recovery point (V3) and an overvoltage protection point (V4). The voltages of the overvoltage recovery point (V3) and the overvoltage protection point (V4) can be set through the resistors R1, R2, R3, and R6, so that the back-end circuit is not prone to repeated opening and closing near the overvoltage point. This hysteresis comparison reduces the number of times the device is repeatedly opened and closed, reduces the probability of device damage, improves the reliability of the back-end circuit, indirectly improves the service life of the device, and reduces the product use cost. The P-channel MOSFET is controlled to be on and off through the output of the comparator, and the multi-channel level values ​​are obtained through the main line operational amplifier comparison;

[0043] In the fourth step, when fixing the lightning arrester body 2 and the mounting base plate 1, the pulling rod 6 can be moved upward first, and the pulling rod 6 moves upward to lengthen the second spring 61, and the pulling rod 6 moves upward to drive the two limit rods 62 to move upward. When the limit rod 62 moves upward to drive the arc slot 63 to move upward and overlap the arc limit block 5, the first spring 52 will rebound at this time, and the first spring 52 rebounds to drive the arc limit block 5 to enter the inner side wall of the arc slot 63. At this time, the limit rod 62 is limited, and the end of the limit rod 62 will be located on the inner side wall of the circular slot 42. The user The threaded rod 43 on the top plate 4 can be passed through the circular groove 31 and the thread can be rotated and installed in the threaded groove 12. At this time, the fixed side plate 3 is fixed to the installation base plate 1 through the threaded rod 43. The user can limit the threaded rod 43. The user can pull the arc-shaped limit block 5 away from the inner side wall of the arc-shaped slot hole 63. At this time, the second spring 61 will rebound and drive the pull rod 6 to move downward. The downward movement of the pull rod 6 will drive the limit rod 62 to move downward. The limit rod 62 will move downward and enter the inner side wall of the first limit groove 13, so as to limit the threaded rod 43 and prevent it from loosening.

[0044] The present application is provided with a pull rod and a limit plug rod, so that after the lightning arrester body and the mounting base are installed, each threaded rod can be fixed and limited, so as to avoid the threaded rod from loosening during use, resulting in loose installation of the mounting base and the lightning arrester body, and to avoid increasing the mechanical stress and wear of the internal components, so that the mounting base and the lightning arrester body are installed tightly.

[0045] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A lightning arrester with overvoltage and undervoltage protection, comprising a mounting base plate (1) and a lightning arrester body (2), characterized in that: The lightning arrester body (2) comprises a lightning arrester unit module, a power supply and voltage sampling module, an upper and lower voltage comparison module, an over-voltage and under-voltage time delay recovery module, and a drive and status indication module. The mounting base plate (1) and the lightning arrester body (2) are provided with a fixing mechanism for facilitating the fixing of the mounting base plate (1) and the lightning arrester body (2), and the fixing mechanism is provided with a limiting mechanism for facilitating the limiting of the fixing mechanism. The fixing mechanism comprises a fixed side plate (3), a top plate (4) and a pulling rod (6); the limiting mechanism comprises an arc-shaped limiting block (5); the number of the fixed side plates (3) is two, and the two fixed side plates (3) are respectively fixedly mounted on the two side ends of the lightning arrester body (2); the upper ends of the two fixed side plates (3) are penetrated by two circular grooves (31); the inner side wall of each circular groove (31) is rotatably mounted with a threaded rod (43); each of the top plates (4) is fixedly mounted on the upper end of the threaded rod (43); and each of the two side ends of the top plate (4) is fixedly mounted with an L-shaped fixing block (41); the number of the arc-shaped limiting blocks (5) is multiple, and each of the arc-shaped limiting blocks (5) is located on one side of the L-shaped fixing block (41); The upper end of each top plate (4) is penetrated by two circular slots (42); the side end of each arc-shaped limit block (5) is fixedly mounted with a mounting rectangular plate (51); a first spring (52) is fixedly mounted between each mounting rectangular plate (51) and the L-shaped fixed block (41); a telescopic rod (53) is also fixedly mounted between each mounting rectangular plate (51) and the L-shaped fixed block (41); and each telescopic rod (53) is located on the inner side wall of the first spring (52); There are multiple pulling rods (6), and two limiting plug rods (62) are fixedly installed at the lower end of each pulling rod (6), and two second springs (61) are also fixedly installed between each pulling rod (6) and the top plate (4).

2. A lightning arrester with overvoltage and undervoltage protection as claimed in claim 1, characterized in that: The upper end of the mounting base plate (1) is provided with a mounting slot hole (11), and the upper end of the mounting base plate (1) is also provided with a plurality of threaded slots (12).

3. A lightning arrester with overvoltage and undervoltage protection as claimed in claim 2, characterized in that: The upper end of the installation base plate (1) is provided with a plurality of first limiting grooves (13), wherein the first limiting grooves (13) are arranged in groups of two; Wherein, each group of the first limiting grooves (13) is located at the circumferential end of the thread groove (12).

4. A lightning arrester with overvoltage and undervoltage protection as claimed in claim 3, characterized in that: Wiring grooves (21) are provided through both side ends of the lightning arrester body (2).

5. A lightning arrester with overvoltage and undervoltage protection as claimed in claim 4, characterized in that: The upper ends of the two fixed side plates (3) are both provided with circular grooves (31), and the upper ends of the two fixed side plates (3) are also provided with a plurality of second limiting grooves (32); The second limiting grooves (32) are arranged in groups of two, and each group of the second limiting grooves (32) is located at the circumferential end of the circular groove (31).

6. A lightning arrester with overvoltage and undervoltage protection as claimed in claim 5, characterized in that: An arc-shaped slot (63) is provided at the circumferential end of each of the limiting insert rods (62), and the size of each of the arc-shaped limiting blocks (5) matches the arc-shaped slot (63).

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