High-voltage switch device applied to transformer

Abstract

The utility model discloses a high-voltage switch device applied to a transformer, which is applied to the technical field of power equipment, the high-voltage switch device is arranged on the top surface of a transformer shell, and the high-voltage switch device comprises a shell (15) with a cavity and a switch operation mechanism (12) arranged in the cavity, a control box (14) is arranged on the side face of the transformer shell. Operation buttons used for controlling the switch operation mechanisms (12) are arranged on the control box (14). The high-voltage switch device further comprises a pressure relief mechanism (11) used for controlling the pressure value in the cavity to be equal to the atmospheric pressure value. The high-voltage switch device is placed on the top of the transformer shell, the requirement for site space limitation is met, and the control and protection functions of the high-voltage switch cabinet are achieved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a high-voltage switchgear used in transformers. Background Technology

[0002] High-voltage switchgear plays a crucial role in power systems, serving as a key guarantee for their safe and reliable operation. Transformers' high-voltage switchgear is particularly vital, widely used in substations, switching stations, and prefabricated substations. High-voltage switchgear includes high-voltage switchgear, high-voltage circuit breakers, high-voltage load switches, high-voltage disconnect switches, and high-voltage fuses, used for power distribution, control, and protection. By rationally selecting and configuring high-voltage switchgear, the safety and reliability of the power system can be effectively improved.

[0003] However, traditional high-voltage switchgear is mostly installed vertically, typically in parallel cabinets on the transformer room, either side-by-side or front-to-back. This traditional installation method occupies a large amount of space, making it difficult to meet the requirements in confined spaces with limited dimensions, resulting in installation difficulties or even being impossible.

[0004] In summary, how to effectively solve the installation problem of high-voltage switchgear in confined spaces is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To solve the installation problem of high-voltage switchgear in confined spaces, this utility model provides a horizontally mounted high-voltage switchgear, which is placed on top of the transformer casing, thus meeting the requirements of on-site space constraints while realizing the control and protection functions of the high-voltage switchgear.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A high-voltage switchgear for use in a transformer is installed on the top surface of the transformer housing. The high-voltage switchgear includes a housing with a chamber, a switch operating mechanism disposed within the chamber, and a control box provided on the side of the transformer housing. The control box is provided with operating buttons for controlling each of the switch operating mechanisms. The high-voltage switchgear also includes a pressure relief mechanism for controlling the pressure value inside the chamber to be equal to the atmospheric pressure value.

[0008] Optionally, the pressure relief mechanism includes a pressure relief port located on the top surface of the outer casing and a pressure relief cover installed at the pressure relief port for disengaging from the pressure relief port to allow the chamber to communicate with the outside when the pressure inside the chamber exceeds its weight.

[0009] Optionally, the pressure relief cover is hinged to the outer shell, and when the pressure inside the chamber is greater than its weight, the pressure relief cover flips to the side away from the chamber to allow the chamber to communicate with the outside.

[0010] Optionally, the pressure relief mechanism further includes:

[0011] A pressure sensor used to detect the pressure inside the cavity;

[0012] A flipping unit connected to the pressure sensor, used to control the pressure relief cover to flip when the pressure in the chamber is detected to be greater than a safe pressure threshold, wherein the safe pressure threshold is less than the weight of the pressure relief cover.

[0013] Optionally, the chamber is divided into multiple fault-prone areas, and the switch operation mechanism is located in each fault-prone area. Each fault-prone area is equipped with a pressure relief mechanism. When the pressure sensor of the pressure relief mechanism detects that the pressure in the fault-prone area is greater than the safe pressure threshold, the corresponding flipping unit controls the pressure relief cover to flip open.

[0014] Optionally, the pressure relief mechanism is connected to the control box, which is used to control all flipping units to flip the pressure relief cover open when more than half of the pressure sensors detect that the regional pressure is greater than the high pressure threshold.

[0015] Optionally, the pressure relief cover includes a first pressure relief plate hinged to the front end of the housing and a second pressure relief plate hinged to the rear end of the housing, with the inner ends of the two pressure relief plates facing each other; it also includes a sealing element disposed at the junction of the two pressure relief plates for sealing the inner ends of the two pressure relief plates.

[0016] Optionally, the seal is connected to the first pressure relief plate, and the seal has a groove on the side wall near the second pressure relief plate, with the inner end of the second pressure relief plate being engaged in the groove.

[0017] Optionally, the seal is connected to the surface of the first pressure relief plate near its inner end, the inner end of the first pressure relief plate extends beyond the edge of the seal, and the inner end of the second pressure relief plate overlaps the protrusion of the first pressure relief plate beyond the seal.

[0018] Optionally, the sealing element spans the pressure relief port and is symmetrically connected to the surface of the housing. The front and rear sides of the sealing element are provided with sealing grooves, and the inner ends of the first pressure relief plate and the second pressure relief plate are connected to the corresponding sealing grooves.

[0019] The beneficial effects of this utility model are that the high-voltage switchgear provided by this utility model is installed on the top surface of the transformer shell and adopts a horizontal layout, making full use of the space above the transformer, that is, effectively utilizing the vertical space, avoiding the limitations of length and width dimensions of traditional parallel cabinet methods, and is particularly suitable for space-constrained scenarios, making it easy to install, maintain and repair the high-voltage switchgear and transformer in a narrow space.

[0020] The high-voltage switchgear includes a housing, a switch operating mechanism, and a pressure relief mechanism. The housing has a base plate, which is independently mounted. If the housing has a sealed chamber, the switch operating mechanism is located within the chamber.

[0021] The switch operating mechanism is equipped with both electric and manual operating mechanisms. To facilitate manual operation, the buttons of the switch operating mechanism are brought to the control box, which is installed on the front of the transformer housing. The buttons are moved down to a suitable height, making it convenient to manually control each switch operating mechanism and facilitating maintenance.

[0022] The high-voltage switchgear is equipped with a pressure relief mechanism located at the top of the structural housing. The high-voltage switchgear monitors the pressure inside the chamber. When the pressure exceeds atmospheric pressure during a fault, the pressure relief mechanism automatically activates to control the pressure inside the chamber to be equal to the atmospheric pressure, thereby venting the arc, ensuring the safe operation of the equipment, and preventing faults or damage caused by abnormal pressure.

[0023] The high-voltage switchgear for transformers provided by this utility model adopts a horizontal installation method, resulting in a compact structure that minimizes floor space and is suitable for confined spaces. Centralized operation via a side control box simplifies the operation process and improves equipment maintainability. A pressure relief mechanism enhances the safety of the equipment during operation, preventing accidents caused by pressure changes. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view of a high-voltage switching device applied to a transformer, provided according to a specific embodiment of the present invention.

[0026] Figure 2 for Figure 1 Side view;

[0027] Figure 3 for Figure 1Rear view;

[0028] Figure 4 for Figure 1 Top view;

[0029] Figure 5 for Figure 1 Axonometric drawing.

[0030] Figure label:

[0031] Pressure relief mechanism 11, switch operation mechanism 12, electromagnetic lock 13, control box 14, outer casing 15, pressure relief plate 111, and seal 112. Detailed Implementation

[0032] The core of this utility model is to provide a high-voltage switchgear for transformers. This high-voltage switchgear is placed on top of the transformer casing, which not only meets the requirements of on-site space constraints, but also realizes the control and protection functions of the high-voltage switchgear.

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please refer to Figures 1 to 5 , Figure 1 This is a front view of a high-voltage switching device applied to a transformer, provided according to a specific embodiment of the present invention. Figure 2 for Figure 1 Side view; Figure 3 for Figure 1 Rear view; Figure 4 for Figure 1 Top view; Figure 5 for Figure 1 Axonometric drawing.

[0035] In one specific embodiment, the high-voltage switchgear provided by this utility model is installed on the top surface of the transformer housing. The high-voltage switchgear includes a housing 15 with a cavity, a switch operating mechanism 12 disposed in the cavity, a control box 14 provided on the side of the transformer housing, and operating buttons for controlling each switch operating mechanism 12 on the control box 14. The high-voltage switchgear also includes a pressure relief mechanism 11 for controlling the pressure value in the cavity to be equal to the atmospheric pressure value.

[0036] In the above structure, the high-voltage switchgear is installed on the top surface of the transformer casing. The transformer can be a dry-type transformer with a horizontal layout, making full use of the space above the transformer, i.e., effectively utilizing vertical space. This avoids the limitations on length and width dimensions imposed by traditional parallel switchgear methods, making it particularly suitable for space-constrained scenarios. It simplifies the installation, maintenance, and repair of the high-voltage switchgear and transformer in confined spaces, while simultaneously meeting safety, control convenience, and equipment operational reliability requirements. Preferably, an installation interface is reserved on the top of the transformer casing 15 to ensure reliable mechanical and electrical connections between the high-voltage switchgear and the transformer casing 15.

[0037] The high-voltage switchgear includes a housing 15, a switch operating mechanism 12, and a pressure relief mechanism 11. The housing 15 has a base plate, which is independently mounted. The housing 15 has a sealed chamber, within which the switch operating mechanism 12 is located. The switch operating mechanism 12 includes an energy storage mechanism; energy is stored before closing the circuit. Closing can be done manually or electrically. The housing 15 ensures electrical insulation and protection performance. The switch operating mechanism 12 is used to control the on / off state of the high-voltage circuit, meeting the operation and protection requirements of the transformer.

[0038] The switch operating mechanism 12 is equipped with an electric operating mechanism, which realizes the opening and closing operation of the switch through electric control. This method can be integrated with the automation system to realize remote control and intelligent management, improving the convenience and efficiency of operation. In addition to electric operation, the high-voltage switchgear is also equipped with a manual operating mechanism for emergency operation in case of electric operation failure or power outage. Manual operation is usually achieved by directly controlling the opening and closing of the switch through a handle or button.

[0039] To facilitate manual operation, the buttons of the switch operating mechanism 12 are routed to the control box 14. The control box 14 is installed on the front of the transformer housing, with the buttons lowered to a suitable height, making manual control of each switch operating mechanism 12 convenient and easy to maintain. For example, the electric control energy storage and closing / opening buttons of the switch operating mechanism 12 can be routed to the control box 14 via wires. During electric operation, the switch opening and closing operations are performed sequentially using the energy storage and closing / opening buttons, which complies with safe operation. Manual operation can also be used to prevent electric operation failures and ensure reliable operability.

[0040] The high-voltage switchgear is equipped with a pressure relief mechanism 11, located on the top of the structural housing 15. The high-voltage switchgear monitors and controls the pressure inside the chamber. When the pressure is higher than atmospheric pressure during a fault, the pressure relief mechanism 11 is automatically activated to control the pressure value inside the chamber to be equal to the atmospheric pressure value, thereby playing an arc-venting role, ensuring the safe operation of the equipment, and preventing faults or damage caused by abnormal pressure.

[0041] The high-voltage switchgear for transformers provided by this utility model adopts a horizontal installation method, resulting in a compact structure that minimizes floor space and is suitable for confined spaces. Centralized operation via a side control box 14 simplifies the operation process and improves equipment maintainability. The pressure relief mechanism 11 enhances the safety of the equipment during operation, preventing accidents caused by pressure changes.

[0042] Based on the above specific embodiments, the pressure relief mechanism 11 includes a pressure relief port provided on the top surface of the outer shell 15 and a pressure relief cover sealed at the pressure relief port for disengaging from the pressure relief port to allow the chamber to communicate with the outside when the pressure inside the chamber is greater than its weight.

[0043] In practical applications, the pressure relief port is located on the top surface of the outer casing 15, serving as a channel connecting the chamber to the outside. The pressure relief port is unobstructed above, facilitating pressure release and ensuring that it does not affect the equipment's sealing and insulation performance during normal operation. A pressure relief cover is used to seal the pressure relief port and automatically detaches when the pressure inside the chamber exceeds its own weight.

[0044] Under normal operating conditions, the pressure relief cover relies on its own weight or auxiliary fixing devices to seal the pressure relief port and maintain the airtightness of the chamber. When the pressure inside the chamber rises sharply due to internal faults, overheating, or other reasons, the pressure will push the pressure relief cover away from the pressure relief port, allowing the pressure inside the chamber to be released to the outside, thereby protecting the equipment from damage.

[0045] Preferably, the area of ​​the pressure relief cover is larger than the area of ​​the pressure relief port. Under normal operating conditions, the pressure relief cover overlaps the top surface of the outer casing 15 around the pressure relief port. During normal operation, the pressure relief cover can reliably seal the pressure relief port, preventing external dust, moisture, etc., from entering the chamber, and avoiding pressure release due to misoperation. A sealing gasket can be provided on the lower surface of the pressure relief cover, and the lower surface of the sealing gasket makes sealing contact with the top surface of the outer casing 15. The pressure relief cover is usually made of a lightweight but high-strength material to ensure that it can quickly detach under pressure, while possessing sufficient strength to withstand pressure shocks.

[0046] The pressure relief mechanism 11 of this application realizes the automatic pressure relief function of the high-voltage switchgear when the pressure is abnormal. By utilizing the balance between the gravity of the pressure relief cover and the pressure in the chamber, reliable safety protection is achieved, which improves the safety of the high-voltage switchgear. Moreover, it does not require manual intervention and can respond quickly when the pressure is abnormal, ensuring the safety of equipment and operators.

[0047] Based on the above specific embodiments, the pressure relief cover is hinged to the outer shell 15. When the pressure inside the chamber is greater than its weight, the pressure relief cover flips to the side away from the chamber so that the chamber can communicate with the outside.

[0048] In one specific embodiment, the pressure relief mechanism 11 includes a pressure relief port located on the top surface of the housing 15, and a pressure relief cover hinged to the pressure relief port. Under normal circumstances, the pressure relief cover tightly seals the pressure relief port, maintaining the airtightness of the chamber. When the pressure inside the chamber exceeds a set value, the pressure pushes the pressure relief cover to flip away from the chamber, thereby connecting the chamber to the outside. This flip-type pressure relief method can quickly release the pressure inside the chamber in a short time, avoiding equipment damage or safety accidents caused by excessive pressure.

[0049] The pressure relief cover is fixed by a hinge, ensuring it will not loosen or fall off under normal pressure, while reliably flipping over to release pressure in case of overpressure. After the pressure returns to normal, flipping the pressure relief cover in the opposite direction will reset it and restore the chamber's seal. This hinged flip-over pressure relief method is simple and efficient, providing reliable safety assurance during the operation of high-voltage switchgear.

[0050] Based on the above specific embodiments, the pressure relief mechanism 11 further includes:

[0051] Pressure sensor used to detect pressure inside a cavity;

[0052] A flipping unit connected to a pressure sensor controls the pressure relief cover to flip when the pressure inside the chamber is detected to be greater than a safe pressure threshold, where the safe pressure threshold is less than the weight of the pressure relief cover.

[0053] In one specific embodiment, the pressure relief mechanism 11 achieves automated control through a pressure sensor and a flipping unit, further improving the safety and reliability of the high-voltage switchgear. The pressure sensor is installed inside the chamber of the high-voltage switchgear to detect pressure changes within the chamber in real time. The flipping unit is connected to the pressure sensor, which converts the detected pressure value into an electrical signal and transmits it to the flipping unit. The flipping unit is a control unit with a preset safe pressure threshold, which is less than the weight of the pressure relief cover, ensuring that the pressure relief cover will not flip automatically due to pressure within the chamber under normal conditions. When the pressure inside the chamber exceeds the safe pressure threshold, the flipping unit is activated, controlling the pressure relief cover to flip, allowing the chamber to connect with the outside and releasing pressure. The flipping unit can be driven by electromagnetic, pneumatic, or hydraulic means, controlling the flipping action of the pressure relief cover through a mechanical structure. Once the pressure returns to normal, the flipping unit can reset the pressure relief cover, restoring the sealing state.

[0054] In the above embodiments, the pressure relief mechanism 11, through the coordinated operation of the pressure sensor and the flipping unit, realizes the automatic pressure relief function of the high-voltage switchgear when the pressure is abnormal. Simultaneously, it achieves automated pressure monitoring and release, reducing manual intervention and effectively avoiding safety issues caused by mechanical failure or misoperation.

[0055] Based on the above specific embodiments, the chamber is divided into multiple fault-prone areas, and the switch operation mechanism 12 is located in each fault-prone area. Each fault-prone area is equipped with a pressure relief mechanism 11. When the pressure sensor of the pressure relief mechanism 11 detects that the pressure in the fault-prone area is greater than the safe pressure threshold, the corresponding flipping unit controls the pressure relief cover to flip open.

[0056] In one specific embodiment, the high-voltage switchgear chamber is divided into multiple fault-prone areas, each equipped with one or more switch operating mechanisms 12. These areas can be divided according to the size of the chamber, the position of each switch operating mechanism 12, and the distance between adjacent areas. For example, the chamber can be divided into three fault-prone areas from left to right, or the areas can be divided according to the concentration or dispersion of the switch operating mechanisms 12. The number and shape of the fault-prone areas are not limited and can be determined according to the actual distribution.

[0057] Each fault-prone area is equipped with an independent pressure relief mechanism 11. Specifically, each fault-prone area is equipped with an independent pressure sensor to detect local pressure changes. When the pressure in any area exceeds the set safe pressure threshold, only the pressure relief mechanism 11 of the relevant area is triggered. Through zoned monitoring and independent pressure relief, it can be ensured that pressure relief is targeted and faster when a local fault occurs, thus improving pressure relief efficiency. Alternatively, a pressure relief mechanism 11 can be installed for each switch operating mechanism 12 position for more precise control.

[0058] Based on the above specific embodiments, the pressure relief mechanism 11 is connected to the control box 14. The control box 14 is used to control all flipping units to flip the pressure relief cover open when it receives that the regional pressure detected by more than half of the pressure sensors is greater than the high pressure threshold.

[0059] In one specific embodiment, the chamber of the high-voltage switchgear is divided into multiple fault-prone zones, each equipped with an independent pressure sensor for real-time monitoring of local pressure. The control box 14, as the core control unit, is connected to all pressure sensors and flip-over units. The control box 14 has a built-in logic judgment module for analyzing sensor data and executing control commands. When more than half of the pressure sensors detect that the pressure in their respective zones exceeds a preset high-pressure threshold, the control box 14 determines that the system is in an abnormal state. Upon receiving this signal, the control box 14 immediately sends commands to all flip-over units, driving the pressure relief covers in all zones to flip open, achieving rapid pressure relief.

[0060] In the above embodiments, centralized management through control box 14 enables real-time monitoring and rapid response of pressure in multiple areas, meeting the intelligent requirements of high-voltage switchgear. The majority-triggered mechanism ensures system reliability and avoids malfunctions due to single-point failures.

[0061] Based on the above specific embodiments, the pressure relief cover includes a first pressure relief plate 111 hinged to the front end of the outer shell 15 and a second pressure relief plate 111 hinged to the rear end of the outer shell 15, with the inner ends of the two pressure relief plates 111 facing each other; it also includes a sealing member 112 disposed at the junction of the two pressure relief plates 111 for sealing the inner ends of the two pressure relief plates 111.

[0062] In one specific embodiment, the pressure relief cover includes two parts: a first pressure relief plate 111 and a second pressure relief plate 111. The first pressure relief plate 111 is hinged to the front end of the outer shell 15, and the second pressure relief plate 111 is hinged to the rear end of the outer shell 15. The inner ends of the two pressure relief plates 111 are arranged opposite to each other to form a movable pressure relief structure. When the pressure is abnormal, the two pressure relief plates 111 can be opened separately or simultaneously to quickly release the pressure in the chamber.

[0063] A seal 112 is provided at the junction of the two pressure relief plates 111 to seal the inner ends of the two pressure relief plates 111 during normal operation and prevent gas leakage. Specifically, the seal 112 is made of highly elastic materials such as EPDM rubber to ensure good sealing performance and low cost.

[0064] Dividing the pressure relief cover into two pressure relief plates 111 reduces the rotation radius of the pressure relief cover, which can reduce the reserved space height above the high-voltage switchgear and reduce the interference of flipping; it also reduces the weight of the pressure relief cover, which reduces the pressure driving the pressure relief cover to flip in the chamber and avoids excessive pressure in the chamber.

[0065] Based on the above specific embodiments, the sealing element 112 is connected to the first pressure relief plate 111. The sealing element 112 has a groove on its side wall near the second pressure relief plate 111, and the inner end of the second pressure relief plate 111 is engaged in the groove. The sealing element 112 and the first pressure relief plate 111 are an integral structure, so there is no need to consider the sealing performance between them. The sealing element 112 and the first pressure relief plate 111 can be integrally formed, resulting in good sealing performance between them. For example, the sealing element 112 is an upward-facing flange at the inner end of the first pressure relief plate 111. The flange is connected to a sealing ring made of highly elastic materials such as polytetrafluoroethylene or rubber on the side near the second pressure relief plate 111. The inner end of the second pressure relief plate 111 is locked in the sealing ring. The sealing element 112 fills the gap between the second pressure relief plate 111 and the first pressure relief plate 111 through elastic deformation, which not only ensures the sealing performance between the second pressure relief plate 111 and the sealing element 112, but also allows the second pressure relief plate 111 and the sealing element 112 to separate quickly during pressure relief, thereby achieving rapid pressure release.

[0066] Based on the above specific embodiments, the sealing member 112 is connected to the surface of the first pressure relief plate 111 near the inner end, the inner end of the first pressure relief plate 111 extends out of the edge of the sealing member 112, and the inner end of the second pressure relief plate 111 overlaps the protrusion of the first pressure relief plate 111 beyond the sealing member 112.

[0067] In one specific embodiment, the first pressure relief plate 111 is hinged to the front end of the housing 15, and a seal 112 is connected to the surface near the inner end. The inner end of the first pressure relief plate 111 extends beyond the edge of the seal 112, forming an overlapping area, and the inner end of the second pressure relief plate 111 overlaps the protrusion of the first pressure relief plate 111 beyond the seal 112.

[0068] When the pressure inside the chamber exceeds a set threshold, the flipping unit is triggered. First, the second pressure relief plate 111 is flipped away from the chamber, causing it to detach from the first pressure relief plate 111. After the second pressure relief plate 111 flips, the first pressure relief plate 111 is then flipped away from the chamber.

[0069] The first pressure relief plate 111 and the second pressure relief plate 111 flip in stages to ensure the smoothness and reliability of the pressure relief process. At the same time, the first pressure relief plate 111 provides support for the second pressure relief plate 111, enhancing the structural rigidity.

[0070] Based on the above specific embodiments, the sealing element 112 spans the pressure relief port and is symmetrically connected to the surface of the housing 15. The front and rear sides of the sealing element 112 are provided with sealing grooves, and the inner ends of the first pressure relief plate 111 and the second pressure relief plate 111 are connected to the corresponding sealing grooves.

[0071] In one specific embodiment, the seal 112 spans the pressure relief port, and is parallel to the front or rear end of the housing 15, symmetrically connected to the surface of the housing 15. The seal 112 acts as a reinforcing rib, strengthening the housing 15 and increasing its strength. The seal 112 covers the entire pressure relief port, providing comprehensive sealing protection.

[0072] The sealing element 112 has sealing grooves on both the front and rear sides. The inner end of the pressure relief plate 111 is embedded in the sealing groove. The sealing element 112 not only plays a sealing role, but also provides stable support for the pressure relief plate 111.

[0073] The two pressure relief plates 111 can be flipped simultaneously in the direction away from the chamber or individually in the direction away from the chamber. The two pressure relief plates 111 do not interfere with each other, which not only ensures that the pressure relief port can be opened quickly to relieve pressure when there is a local pressure abnormality, but also avoids the failure of the entire pressure relief mechanism 11 due to the failure of a single pressure relief plate 111.

[0074] In a preferred embodiment, the outer casing 15 is provided with a detachable door. The detachable door can be detached when the power is off, and cannot be detached when the power is on, by means of electromagnetic locks 13 arranged on the left and right sides, thereby improving the safety of opening the door.

[0075] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0076] The high-voltage switching device for transformers provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, this utility model is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage switchgear for use in transformers, characterized in that, The high-voltage switchgear is installed on the top surface of the transformer housing. The high-voltage switchgear includes a housing (15) with a chamber and a switch operating mechanism (12) disposed in the chamber. A control box (14) is provided on the side of the transformer housing. The control box (14) is provided with operating buttons for controlling each of the switch operating mechanisms (12). The high-voltage switchgear also includes a pressure relief mechanism (11) for controlling the pressure value in the chamber to be equal to the atmospheric pressure value.

2. The high-voltage switching device for transformers according to claim 1, characterized in that, The pressure relief mechanism (11) includes a pressure relief port on the top surface of the outer shell (15) and a pressure relief cover on the pressure relief port for disengaging from the pressure relief port to allow the chamber to communicate with the outside when the pressure inside the chamber is greater than its weight.

3. The high-voltage switching device applied to a transformer according to claim 2, characterized in that, The pressure relief cover is hinged to the outer shell (15). When the pressure inside the cavity is greater than its weight, the pressure relief cover flips to the side away from the cavity so that the cavity can communicate with the outside.

4. The high-voltage switching device for transformers according to claim 3, characterized in that, The pressure relief mechanism (11) also includes: A pressure sensor used to detect the pressure inside the cavity; A flipping unit connected to the pressure sensor, used to control the pressure relief cover to flip when the pressure in the chamber is detected to be greater than a safe pressure threshold, wherein the safe pressure threshold is less than the weight of the pressure relief cover.

5. The high-voltage switching device for transformers according to claim 4, characterized in that, The chamber is divided into multiple fault-prone areas. The switch operation mechanism (12) is located in each fault-prone area. Each fault-prone area is equipped with a pressure relief mechanism (11). When the pressure sensor of the pressure relief mechanism (11) detects that the pressure in the fault-prone area is greater than the safe pressure threshold, the corresponding flipping unit controls the pressure relief cover to flip open.

6. The high-voltage switching device for transformers according to claim 5, characterized in that, The pressure relief mechanism (11) is connected to the control box (14), which is used to control all flipping units to flip the pressure relief cover open when the pressure detected by more than half of the pressure sensors is greater than the high pressure threshold.

7. The high-voltage switching device for a transformer according to any one of claims 2-6, characterized in that, The pressure relief cover includes a first pressure relief plate (111) hinged to the front end of the outer shell (15) and a second pressure relief plate (111) hinged to the rear end of the outer shell (15), with the inner ends of the two pressure relief plates (111) facing each other; it also includes a sealing element (112) provided at the junction of the two pressure relief plates (111) for sealing the inner ends of the two pressure relief plates (111).

8. The high-voltage switching device for a transformer according to claim 7, characterized in that, The sealing element (112) is connected to the first pressure relief plate (111). The sealing element (112) has a groove on the side wall near the second pressure relief plate (111), and the inner end of the second pressure relief plate (111) is engaged in the groove.

9. The high-voltage switching device for a transformer according to claim 8, characterized in that, The seal (112) is connected to the surface of the first pressure relief plate (111) near the inner end, the inner end of the first pressure relief plate (111) extends out of the edge of the seal (112), and the inner end of the second pressure relief plate (111) overlaps the protrusion of the first pressure relief plate (111) beyond the seal (112).

10. The high-voltage switching device for a transformer according to claim 7, characterized in that, The sealing element (112) spans the pressure relief port and is symmetrically connected to the surface of the outer shell (15). The front and rear sides of the sealing element (112) are provided with sealing grooves. The inner ends of the first pressure relief plate (111) and the second pressure relief plate (111) are connected to the corresponding sealing grooves.

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