Overvoltage protection assembly and overvoltage protection system composed of voltage-sensitive non-linear elements

Abstract

The utility model discloses an overvoltage protection assembly and system formed by voltage-sensitive nonlinear elements. The assembly comprises an insulating core tube, a plurality of nonlinear elements, a first electrode, a second electrode, an insulating cylinder, a cooling fan and a temperature sensor. The assembly can perform forced air cooling on the nonlinear element, and is timely in response, good in cooling effect, simple and compact in structure and easy to integrate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of overvoltage protection assembly and system of voltage sensitive type nonlinear element group structure. BACKGROUND

[0002] Zinc oxide arrester is mainly composed of zinc oxide valve piece, and its property belongs to pressure-sensitive resistor. The voltage sensitive type nonlinear element of the utility model also belongs to the category of pressure-sensitive resistor. Under normal working voltage, the value of pressure-sensitive resistor is very large, which is equivalent to high resistance state. However, under the action of impulse voltage (greater than the pressure-sensitive voltage), the pressure-sensitive resistor presents low resistance conduction, which is similar to short-circuit state. However, the conduction state of the pressure-sensitive resistor can be restored to high resistance state after voltage reduction. Therefore, after installing zinc oxide arrester on power line, when lightning strikes, the high voltage of lightning wave makes the pressure-sensitive resistor conductive, and the lightning current flows into the ground through the pressure-sensitive resistor, thereby releasing the overvoltage energy, so as to control the voltage on the power line within a safe range and protect the safety of electrical equipment. Zinc oxide arrester is an electrical product used to protect various electrical equipment in power systems from external overvoltage damage, and has good protection performance. Because the nonlinear voltage-current characteristic of zinc oxide valve piece is very good, only a few tens of microamperes of current passes through under normal working voltage, which facilitates the design of gapless structure, so that it has the characteristics of good protection performance, light weight and small size. When overvoltage invades, the current flowing through the valve piece increases rapidly, limiting the amplitude of overvoltage and releasing the energy of overvoltage. Thereafter, the zinc oxide valve piece restores to high resistance state, so that the power system works normally.

[0003] However, the capacity of ordinary zinc oxide arrester valve piece cannot withstand the working conditions with high frequency or large energy and long duration of internal overvoltage. The voltage sensitive type nonlinear element of the utility model can overcome the key technical problems of the serious capacity shortage of various traditional zinc oxide arresters. The voltage sensitive type nonlinear element allows a super-large current of tens of thousands of amperes to pass through instantaneously, but the conduction time is limited (measured in microseconds). Once the conduction time exceeds the limit, the element will heat up rapidly. If no precautions and suppression are taken, thermal runaway may occur, resulting in damage to the system and loss of protection. Even if thermal runaway does not occur immediately, the element will be running at a relatively high temperature, which will accumulate thermal damage and accelerate the aging of the element.

[0004] Chinese invention patent application CN110718345A provides a lightning arrester, a lightning arrester cooling assembly and a power transmission system. The solution is to place the lightning arrester in a cooling container and set a cooling component in the cooling container to reduce the temperature in the cooling container. Specifically, the lightning arrester is cooled from the outside by using an evaporator or an ice bag. The structure is relatively complex, especially for high-voltage electrical equipment, which is difficult to implement, and the cost is high, the volume is large, the cooling effect is poor, and the response speed is slow. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of overvoltage protection assembly and system of voltage sensitive type nonlinear element group structure.

[0006] The utility model discloses the technical scheme as follows: an overvoltage protection assembly of voltage sensitive type nonlinear element group structure, comprising:

[0007] Insulating core pipe, straight pipe shape is presented;

[0008] Multiple nonlinear elements, all annular and all surround the insulating core pipe, are stacked along the length direction of the insulating core pipe, and are electrically connected by pressure contact between adjacent nonlinear elements;

[0009] First electrode, surround the insulating core pipe, and is arranged on the first end surface of the multiple nonlinear elements as a whole, and is electrically connected with the multiple nonlinear elements;

[0010] Second electrode, surround the insulating core pipe, and is arranged on the second end surface of the multiple nonlinear elements as a whole, and is electrically connected with the multiple nonlinear elements;

[0011] Insulating cylinder, surround the multiple nonlinear elements, the first electrode and the second electrode, the first end of the insulating cylinder is in the same direction with the first electrode pointing to the second electrode, the first electrode and the second electrode can be electrically connected with the structure outside the insulating cylinder;

[0012] Radiating fan, fixed in the second end of the insulating cylinder, and there is spacing between the insulating core pipe, and can be communicatively connected with general controller outside the insulating cylinder, and the air outlet direction points to the first end of the insulating cylinder, forms the central heat dissipation air passage from the radiating fan to the insulating core pipe again through the first end of the insulating cylinder and flows out the insulating cylinder;

[0013] Temperature sensor, fixedly arranged relative to the insulating cylinder, for detecting the temperature of the multiple nonlinear elements, and can be communicatively connected with the general controller.

[0014] Optionally, it further includes insulating mounting plate, the second end of the insulating cylinder is fixed on the first plane surface of the insulating mounting plate, the radiating fan is fixed on the second plane surface of the insulating mounting plate, fourth through hole is opened on the insulating mounting plate, and the fourth through hole is communicated with the internal space of the insulating cylinder.

[0015] Optionally, it further includes dust cover that covers the first end of the insulating cylinder, and air hole is opened around the side surface of the dust cover.

[0016] Optionally, it further includes insulating sealing resin, and the first electrode and the second electrode are wrapped;

[0017] Also including silicon rubber, filling the gap between the insulating cylinder and the non-linear element and the gap between the non-linear element and the insulating core tube.

[0018] Optionally, further comprising a current sensor mounted outside the insulating cylinder for detecting the current flowing through the plurality of non-linear elements and being communicatively connected with the total controller.

[0019] Optionally, the temperature sensor is in contact with the outer circumferential surface of the non-linear element through an opening in the side wall of the insulating cylinder.

[0020] The technical scheme of the utility model is as follows: a kind of overvoltage protection system, including total controller and the overvoltage protection assembly of voltage-sensitive non-linear element group structure described above, the total controller is connected with the temperature sensor and the cooling fan communication.

[0021] Optionally, the first electrode is connected to the first end of the protected device, the second electrode is connected to the second end of the protected device, and the overvoltage protection system further comprises a circuit breaking structure, which is connected between the first electrode and the first end of the protected device or between the second electrode and the second end of the protected device.

[0022] The overvoltage protection assembly is connected to both ends of the protected device when in use, providing overvoltage protection for the protected device. When the overvoltage state lasts for a long time, the temperature of the non-linear element rises, triggering the cooling fan to forcibly cool and dissipate heat from the non-linear element. The cooling fan responds quickly, rapidly reducing the temperature of the non-linear element and significantly increasing the effective operating time of the non-linear element. In addition, since the central heat dissipation air channel passes through the interior of the non-linear element, the heat dissipation effect is good, and the temperature of the non-linear element can be quickly reduced. Further, the overvoltage protection assembly is simple and compact in structure, does not require the connection of complex devices such as evaporators, and does not require manual addition of ice blocks, and can be integrated inside the housing of the protected device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the overvoltage protection assembly and system of the utility model.

[0024] Figure 2 and Figure 3 is Figure 1 a partial enlarged view.

[0025] Figure 4 is a partial circuit block diagram of the overvoltage protection system of the utility model.

[0026] Figure 5 is a partial circuit diagram of the overvoltage protection system of the utility model.

[0027] Figure 6 This is another partial circuit diagram of the overvoltage protection system of the utility model.

[0028] The figures are marked as follows: 1. dust cover; 2. first bolt; 3. fixing block; 4. first bracket; 5. insulating sealing resin; 6. first lead; 7. first electrode; 8. first outlet seat; 9. second bolt; 10. silicone rubber; 11. insulating cylinder; 12. nonlinear element; 13. insulating core tube; 14. central heat dissipation air channel; 15. second electrode; 16. fixing screw; 17. first plug structure; 18. second outlet seat; 19. heat dissipation fan; 20. third bolt; 21. insulating mounting plate; 22. mounting foot; 23. main controller; 24. temperature measuring optical fiber; 25. fourth bolt; 26. cock; 27. second lead; 28. current sensor lead; 29. ​​current sensor; 30. mounting bolt; 31. fifth bolt; 32. sixth bolt; 33. circuit breaker; 34. power bus; 35. common ground bus. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0030] refer to Figures 1 to 3 , an embodiment of the utility model provides an overvoltage protection component, comprising:

[0031] The insulating core tube 13 is in the shape of a straight tube;

[0032] A plurality of nonlinear elements 12 are annular and surround the insulating core tube 13, and are stacked along the length of the insulating core tube 13, with adjacent nonlinear elements 12 being in pressure contact and electrically connected;

[0033] The first electrode 7 surrounds the insulating core tube 13 and is disposed on the first end surface of the plurality of nonlinear elements 12 as a whole, and is electrically connected to the plurality of nonlinear elements 12;

[0034] The second electrode 15 surrounds the insulating core tube 13 and is disposed on the second end surface of the plurality of nonlinear elements 12, and is electrically connected to the plurality of nonlinear elements 12;

[0035] An insulating tube 11 surrounds the plurality of nonlinear elements 12, the first electrode 7, and the second electrode 15. The direction from the first end of the insulating tube 11 to the second end is the same as the direction from the first electrode 7 to the second electrode 15. The first electrode 7 and the second electrode 15 can both be electrically connected to structures outside the insulating tube 11.

[0036] A heat dissipation fan 19 is fixed at the second end of the insulating cylinder 11, and is spaced apart from the insulating core pipe 13, and is in communication connection with the general controller 23 outside the insulating cylinder 11, and the air outlet direction is directed to the first end of the insulating cylinder 11, forming a central heat dissipation air passage 14 from the heat dissipation fan 19 to the insulating core pipe 13, and then out of the insulating cylinder 11 through the first end of the insulating cylinder 11;

[0037] A temperature sensor is fixed relative to the insulating cylinder 11, and is used to detect the temperature of the plurality of nonlinear elements 12, and is in communication connection with the general controller 23.

[0038] Figures 1 to 3 The arrow direction is the flow direction of the wind. In this embodiment, the second electrode 15 is located below the first electrode 7, and the overvoltage protection assembly is vertically placed, and the wind blows from bottom to top. In other embodiments, the overvoltage protection assembly can also be horizontally placed, that is, the flow direction of the wind is basically horizontal.

[0039] Preferably, the material of the nonlinear element 12 adopts the high-energy high-residual-voltage ratio nonlinear resistor sheet provided in Chinese Utility Model Patent CN114914042B, which can be prepared into a larger size ring structure than ZnO or other known nonlinear materials.

[0040] The current passing through the nonlinear element 12 is mainly concentrated near the outer surface thereof due to the skin effect, and the difference in effective cross section between the ring-shaped nonlinear element 12 and the circular pie-shaped nonlinear element 12 can be ignored, and has no substantial influence on the current discharge capacity. Further, the hollow part of the ring-shaped nonlinear element 12 provides a channel for forced air cooling.

[0041] The temperature signal detected by the temperature sensor serves as the basis for starting the heat dissipation fan 19, and when the temperature of the nonlinear element 12 is high, the heat dissipation fan 19 is triggered to start forced air cooling of the nonlinear element 12 from the inside of the nonlinear element 12.

[0042] Figure 1 In the illustrated embodiment, a temperature sensor (not shown) is in communication connection with the general controller 23 through a temperature measuring optical fiber 24. In other embodiments, the temperature sensor is electrically connected or bus-connected to the general controller 23. A fifth through hole is formed in the insulating cylinder 11 for the temperature measuring optical fiber 24 to lead out.

[0043] The present invention does not limit the type and location of the temperature sensor. For example, the temperature sensor may contact the nonlinear element 12 or be separated from the nonlinear element 12 by other structures. That is, the temperature of the nonlinear element 12 may be measured directly or indirectly. Preferably, the temperature sensor contacts the outer circumference of the nonlinear element 12 through an opening in the side wall of the insulating tube 11 and is fixed relative to the insulating tube 11. This allows for direct and effective temperature data, minimizing interference. In other embodiments, a set gap exists between the temperature sensor and the insulating tube 11.

[0044] In a further preferred embodiment, a current sensor 29 is further included, mounted on the exterior of the insulating cylinder 11. A second lead 27 passes through a central window of the current sensor 29, detecting the current flowing through the plurality of nonlinear elements 12 and enabling communication with the master controller 23. A current sensor lead 28 connects the current sensor 29 to the master controller 23. When the current sensor 29 detects a current greater than a set current threshold, the master controller 23 trips the circuit breaker, isolating trolley, or other disconnecting mechanism.

[0045] Figure 2 The main controller 23 shown also integrates a display screen and buttons for human-computer interaction.

[0046] The insulating tube 11 is made of, for example, vacuum-cast epoxy resin, which has high dielectric strength, good mechanical properties, low water absorption, and good aging resistance and stability.

[0047] Optionally, refer to Figure 2 In the left side of the middle insulating core tube 13, a first through hole is provided on the insulating cylinder 11, and a first groove is provided on the outer peripheral surface of the first electrode 7, and the opening of the first groove points to the first through hole; the overvoltage protection component also includes a first outlet seat 8 made of a conductor, and the first outlet seat 8 is in a boss shape. The bottom of the first outlet seat 8 is against the outer peripheral surface of the insulating cylinder 11, and the top of the first outlet seat 8 is inserted into the first groove through the first through hole and is in conductive contact with the first electrode 7.

[0048] Specifically, in this embodiment, the first groove extends to the surface of the first electrode 7 facing away from the nonlinear element 12, and the first bracket 4 blocks the opening of the first groove on the surface of the first electrode 7 facing away from the nonlinear element 12. The first bolt 2 passes through the first bracket 4 and the first outlet seat 8, fastening the first bracket 4, the first outlet seat 8, and the first electrode 7 along the axial direction of the insulating tube 11.

[0049] In other embodiments, the first groove is only opened on the outer circumference of the first electrode 7 .

[0050] Specifically, in this embodiment, the first electrode 7 is in the shape of an annular flat plate.

[0051] Specifically, in this embodiment, a groove is formed on the surface of the first outlet seat 8 facing away from the first electrode 7, and the second bolt 9 passes through the first lead 6 and is inserted into the groove on the surface of the first outlet seat 8 facing away from the first electrode 7, thereby fastening the first outlet seat 8 and the insulation cylinder 11 along the radial direction of the insulation cylinder 11.

[0052] In other embodiments, the first lead 6 may also be fixed to the first outlet base 8 by welding or plug connection. The first lead 6 is used to connect to the protected device.

[0053] Optionally, refer to Figure 2 In the portion on the right side of the middle insulating core tube 13, a second groove is formed on the inner circumferential surface of the insulating tube 11, and a third groove is formed on the outer circumferential surface of the first electrode 7. The opening of the second groove and the opening of the third groove are opposite to each other, and the third groove extends to the surface of the first electrode 7 facing away from the nonlinear element 12. The overvoltage protection assembly also includes a fixing block 3, a first bolt 2 and an annular first bracket 4. The first bracket 4 surrounds the insulating core tube 13 and is located on the side of the first electrode 7 facing away from the nonlinear element 12. The fixing block 3 is in the shape of a boss. The bottom of the fixing block 3 is inserted into the second groove, and the top of the fixing block 3 is inserted into the third groove. The first bolt 2 is used to fasten the first bracket 4, the fixing block 3 and the first electrode 7.

[0054] During assembly, first put in the fixing block 3, then put in the first electrode 7 and the first bracket 4, and then fix with the first bolt 2. This design facilitates the assembly of the fixing block 3, the first electrode 7 and the first bracket 4.

[0055] The first bracket 4 is a good conductor. The insulating sealing resin 5 wraps the exposed surface of the first bracket 4, thereby wrapping the first electrode 7.

[0056] Optionally, refer to Figure 3 In the left side of the insulating core tube 13, a second through hole is provided on the insulating cylinder 11, and a fourth groove is provided on the outer circumferential surface of the second electrode 15, and the opening of the fourth groove points to the second through hole; the overvoltage protection component also includes a second outlet seat 18 made of a conductor, and the second outlet seat 18 is in a boss shape. The bottom of the second outlet seat 18 is against the outer circumferential surface of the insulating cylinder 11, and the top of the second outlet seat 18 is inserted into the fourth groove through the second through hole and is in conductive contact with the second electrode 15.

[0057] Specifically, a first plug structure 17 (e.g., a bolt) passes through the second outlet seat 18 and is inserted into the fourth groove, thereby securing the second outlet seat 18 radially relative to the insulating cylinder 11. In this embodiment, the second outlet seat 18 serves as a standby component and is not activated. Once the first plug structure 17 is removed from the second outlet seat 18, an insulating cover (not shown) or insulating sealing resin (not shown) may be used to encase the second outlet seat 18, thereby isolating the second outlet seat 18 from the exterior of the overvoltage protection assembly.

[0058] Optionally, referring to Figure 3 the right side of the insulating core tube 13, a third through hole is formed on the insulating cylinder 11, a fifth groove is formed on the outer circumferential surface of the second electrode 15, and the opening of the fifth groove points to the third through hole; the overvoltage protection assembly further comprises a second plug structure made of a conductor, which is inserted into the fifth groove through the third through hole and is in conductive contact with the second electrode 15.

[0059] The second plug structure is a good conductor for leading current out of the insulating cylinder 11.

[0060] Preferably, the resistance of the second plug structure is smaller than that of a single nonlinear element 12 when overvoltage occurs.

[0061] Specifically, the fourth bolt 25 and the plug 26 constitute the second plug structure. The fourth bolt 25 is inserted into the fifth groove through the third through hole, and a threaded groove is formed at the bottom of the fourth bolt 25, and then the plug 26 is inserted into the threaded groove at the bottom of the bolt after passing through the second lead-out wire. In this way, the second electrode 15 is fastened along the radial direction of the insulating cylinder 11, and the current is led out of the insulating cylinder 11.

[0062] In other embodiments, the second lead-out wire is welded or plugged on the second plug structure.

[0063] In some other embodiments, the first electrode 7 and the second electrode 15 lead current in and out from the openings at both ends of the insulating cylinder 11.

[0064] Optionally, referring to Figure 3 , the overvoltage protection assembly further comprises an insulating mounting plate 21, the second end of the insulating cylinder 11 is fixed on the first planar surface of the insulating mounting plate 21, the heat dissipation fan 19 is fixed on the second planar surface of the insulating mounting plate 21, a fourth through hole is formed on the insulating mounting plate 21, and the fourth through hole is communicated with the internal space of the insulating cylinder 11.

[0065] Specifically, the third bolt 20 passes through the second end surface of the insulating cylinder 11 and the insulating mounting plate 21 in sequence. In addition, the fifth bolt 31 passes through the shell of the heat dissipation fan 19 and the insulating mounting plate 21 in sequence, thereby realizing the installation of the heat dissipation fan 19.

[0066] Specifically, the sixth bolt 32 is used to fix the insulating mounting plate 21 on the mounting foot 22.

[0067] Optionally, referring to Figure 2 , it further comprises a dust cover 1 covering the first end of the insulating cylinder 11, and the dust cover 1 is provided with a vent hole. In this embodiment, the vent hole is formed on the side surface of the dust cover 1, which reduces the amount of dust entering the insulating cylinder 11.

[0068] Optionally, the silicon rubber 10 is also included to fill the gap between the insulating cylinder 11 and the nonlinear element 12 and the gap between the nonlinear element 12 and the insulating core tube 13; the insulating sealing resin 5 is wrapped around the first electrode 7 and the second electrode 15.

[0069] In order to smoothly fit each nonlinear element 12 into the insulating core tube 13, a certain gap is generated between the center hole of the nonlinear element 12 and the insulating core tube 13; after assembly, the insulating cylinder 11 also needs to be smoothly fitted outside the nonlinear element 12, and a certain gap is also generated between the assembly of the nonlinear element 12 as a whole and the inner circumferential surface of the insulating cylinder 11. The silicon rubber 10 needs to be filled, and after curing, it fills these gaps. The entire surface above the first support 4, the entire surface below the second electrode 15, and the inner cavity wall of the insulating cylinder 11 are filled with the insulating sealing resin 5.

[0070] After the insulating sealing resin 5 is cured, it will no longer flow, forming a firm protective layer to make the overall structure more stable.

[0071] The insulating sealing resin 5 also plays an electrical insulation role, ensuring the normal operation of electrical equipment and circuits, and in a high-voltage environment, it can withstand a large electric field strength without being punctured, ensuring the safety of the equipment.

[0072] The insulating sealing resin 5 also plays a sealing role, preventing moisture and humidity from entering the interior of the sealed components, improving the reliability of the overvoltage protection assembly.

[0073] The insulating sealing resin 5 also plays a thermal protection role, having certain thermal conductivity, which can help conduct heat from the nonlinear element 12 to the outside, quickly dissipate heat, and more effectively dissipate heat through air, preventing thermal collapse.

[0074] The silicon rubber 10 material has good flowability and can effectively fill the gaps, playing a waterproof and dustproof sealing role to protect the internal circuit from external environmental influences. The silicon rubber 10 has excellent flexibility and elasticity. It can bend, stretch, and twist within a large range without breaking or damaging. The silicon rubber 10 can play a good sealing role in complex shapes, irregular surfaces, and narrow gaps; the silicon rubber 10 has good insulation performance, preventing short circuits and electric leakage.

[0075] The silicon rubber 10 is resistant to high temperatures and can maintain stable performance within a wide temperature range, ensuring normal operation in a high-temperature environment when using silicon rubber insulation materials.

[0076] Since the cooling fan 19 is a low-voltage device and the nonlinear element 12 operates in a high-voltage state, they should maintain a reasonable insulation distance. Optionally, the distance between the insulating core tube 13 and the cooling fan 19 is determined by the voltage level of the use environment. Generally, the higher the voltage level, the greater the required insulation distance.

[0077] Figure 1 The assembly process of the overvoltage protection assembly is as follows. First, the insulating core tube 13 is fixed in the center hole of the second electrode 15; then the assembled nonlinear element 12 is sequentially sleeved on the insulating core tube 13, and finally sleeved into the first electrode 7 and fixed and pressed; then the insulating cylinder 11 is sleeved outside the nonlinear element 12, the first plug structure 17 is inserted into the second outlet seat 18 and fixed together with the fourth bolt 25 to fix the second electrode 15, the fixing block 3 and the first outlet seat 8 are used to fix the first electrode 7 and the nonlinear element 12; the silicone rubber 10 is filled and sealed, and the temperature sensor and the temperature measuring optical fiber 24 are fixed, and after the silicone rubber 10 is cured, the first bolt 2 (specifically an internal hexagonal bolt) is used to fix the first support 4, the fixing block 3 and the first outlet seat 8; the first outlet seat 8 and the second outlet seat 18 are fixed firmly by using the fixing screw 16, and the third bolt 20 is used to install the insulating cylinder 11 on the insulating mounting plate 21; the dust cover 1 is covered at the first end of the insulating cylinder 11; the heat dissipation fan 19 is installed, and the foundation foot 22 is fixed by using the sixth bolt 32; the second lead wire 27 is inserted into the first outlet seat 8 by the second bolt 9, and the second lead wire 27 is connected to the common ground bus 35 by using the mounting bolt 30 at the end of the second lead wire 27. The current sensor lead wire 28 connects the current sensor 29 to the total controller 23.

[0078] Based on the same utility model concept, reference Figures 4 to 6 and in combination Figures 1 to 3 , the embodiment of the utility model also provides an overvoltage protection system, which comprises a total controller 23 and the above-mentioned overvoltage protection assembly, the total controller 23 is in communication connection with the temperature sensor and the heat dissipation fan 19 (specifically connected to the fan controller of the heat dissipation fan 19), and the total controller 23 is configured to start the heat dissipation fan 19 when the temperature of the nonlinear element 12 is greater than a first temperature threshold, and the heat dissipation fan is always in a shutdown state when the temperature is lower than the first threshold.

[0079] Reference Figure 5 , in use, the first electrode 7 is connected to the first end of the protected device (for example, connected to the power bus 34), and the second electrode 15 is connected to the second end of the protected device (for example, connected to the common ground bus 35). The number of overvoltage protection assemblies can be one or more, and the multiple overvoltage protection assemblies can be in parallel and / or series connection relationship.

[0080] Optionally, reference Figure 6The overvoltage protection system further comprises a circuit breaker 33 connected between the first electrode 7 and the first end of the protected device or connected between the second electrode 15 and the second end of the protected device, and the total controller 23 is configured to disconnect the circuit breaker 33 when the temperature of the non-linear element 12 is greater than a second temperature threshold, the second temperature threshold being greater than the first temperature threshold.

[0081] The circuit breaker 33 can also be replaced by a circuit breaking structure such as an isolation trolley.

[0082] When the temperature of the non-linear element 12 is too high, the total controller 23 automatically cuts off the connection between the non-linear element 12 and the power bus 34.

[0083] In the embodiments of the utility model, reference Figure 3 , Figure 4 , Figure 5 and Figure 6 A current sensor 29 is further arranged on the circuit path of the overvoltage protection assembly, and the total controller 23 can further control the circuit breaker 33 to disconnect in the case of overcurrent.

[0084] The overvoltage protection system of the utility model is suitable for both internal overvoltage and external overvoltage such as lightning strike.

[0085] The various embodiments in the utility model all adopt a progressive manner for description, and the same and similar parts between the various embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0086] The protection scope of the utility model is not limited to the above-mentioned embodiments, obviously, those skilled in the art can make various changes and deformations to the utility model without departing from the scope and spirit of the utility model. If these changes and deformations belong to the scope of the claims of the utility model and its equivalent technologies, the intention of the utility model also includes these changes and deformations.

Claims

1. An overvoltage protection assembly of a voltage sensitive non-linear element configuration, characterized in that, The application relates to a kind of overvoltage protection components, comprising: an insulating core pipe in a straight pipe shape; a plurality of non-linear elements, each in a ring shape and surrounding the insulating core pipe, stacked along the length direction of the insulating core pipe, and electrically connected by pressure contact between adjacent non-linear elements; a first electrode surrounding the insulating core pipe and arranged on a first end surface of the plurality of non-linear elements, electrically connected to the plurality of non-linear elements; a second electrode surrounding the insulating core pipe and arranged on a second end surface of the plurality of non-linear elements, electrically connected to the plurality of non-linear elements; an insulating cylinder surrounding the plurality of non-linear elements, the first electrode and the second electrode, the first end of the insulating cylinder pointing in the same direction as the second electrode from the first electrode, and the first electrode and the second electrode both capable of being electrically connected to a structure outside the insulating cylinder; a cooling fan fixed to the second end of the insulating cylinder, spaced apart from the insulating core pipe, and arranged to be communicatively connected to a general controller outside the insulating cylinder, with an air outlet direction pointing to the first end of the insulating cylinder, forming a central cooling air passage from the cooling fan to the insulating core pipe and out of the insulating cylinder through the first end of the insulating cylinder; a temperature sensor fixed relative to the insulating cylinder, arranged to detect the temperature of the plurality of non-linear elements, and arranged to be communicatively connected to the general controller.

2. The overvoltage protection assembly of claim 1, wherein the voltage sensitive non-linear element is a varistor. The application further comprises an insulating mounting plate, the second end of the insulating cylinder is fixed to a first planar surface of the insulating mounting plate, the cooling fan is fixed to a second planar surface of the insulating mounting plate, a fourth through hole is formed in the insulating mounting plate, and the fourth through hole is in communication with the internal space of the insulating cylinder.

3. The overvoltage protection assembly of claim 1, wherein the voltage sensitive non-linear element is a varistor. The application further comprises a dustproof cover covering the first end of the insulating cylinder, and air holes are formed around the side of the dustproof cover.

4. The overvoltage protection assembly of claim 1, wherein the voltage sensitive non-linear element is a varistor. The application further comprises insulating sealing resin, wrapping the first electrode and the second electrode; The application further comprises silicone rubber, filling the gaps between the insulating cylinder and the non-linear elements and the gaps between the non-linear elements and the insulating core pipe; The first electrode is in a ring-shaped flat plate shape.

5. The overvoltage protection assembly of claim 1, wherein the voltage sensitive non-linear element is a varistor. The application further comprises a current sensor installed outside the insulating cylinder, arranged to detect the current flowing through the plurality of non-linear elements, and arranged to be communicatively connected to the general controller.

6. The overvoltage protection component of claim 1, wherein the voltage sensitive non-linear element is a varistor. The temperature sensor is in contact with the outer circumferential surface of the non-linear elements through a side wall aperture of the insulating cylinder.

7. The overvoltage protection component of claim 1, wherein the voltage sensitive non-linear element is a varistor. A first through hole is formed in the insulating cylinder, a first groove is formed in the outer circumferential surface of the first electrode, and the opening of the first groove points to the first through hole; the overvoltage protection component further comprises a first outlet seat made of a conductor, the first outlet seat is in a boss shape, the bottom of the first outlet seat abuts against the outer circumferential surface of the insulating cylinder, and the top of the first outlet seat is arranged to be inserted into the first groove through the first through hole and in conductive contact with the first electrode.

8. The overvoltage protection component of claim 1, wherein the voltage sensitive non-linear element is a varistor. The insulating cylinder is provided with a second through hole, the outer circumferential surface of the second electrode is provided with a fourth groove, and the opening of the fourth groove is directed to the second through hole; the overvoltage protection assembly further comprises a second outgoing line seat made of a conductor, the second outgoing line seat is in the shape of a boss, the bottom of the second outgoing line seat abuts against the outer circumferential surface of the insulating cylinder, and the top of the second outgoing line seat is arranged to be inserted into the fourth groove through the second through hole and to be in conductive contact with the second electrode.

9. An overvoltage protection system, characterized by The overvoltage protection assembly comprises a total controller and a voltage-sensitive nonlinear element group according to any one of claims 1 to 8, and the total controller is in communication connection with the temperature sensor and the cooling fan, respectively.

10. The overvoltage protection system of claim 9, wherein, The first electrode is connected to a first end of a protected device, the second electrode is connected to a second end of the protected device, and the overvoltage protection system further comprises a circuit breaking structure connected between the first electrode and the first end of the protected device or connected between the second electrode and the second end of the protected device.

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