An explosion-proof structure for electromagnetic units and a capacitive voltage transformer

Abstract

This utility model provides a pressure relief and explosion-proof structure for an electromagnetic unit and a capacitive voltage transformer, belonging to the field of capacitive voltage transformers. It includes an electromagnetic unit with a pressure relief and explosion-proof structure. The structure includes a pressure relief hole on the outer casing of the electromagnetic unit, and a pressure relief plate detachably mounted on the outside of the pressure relief hole. The pressure relief plate is made of transparent material, and an oil level line is provided on its surface. The beneficial effect of this utility model is that it integrates explosion-proof pressure relief and oil level observation functions into one unit, enabling both pressure safety release and oil level monitoring, thereby reducing equipment complexity and maintenance costs, and providing a better solution for the safe and stable operation of capacitive voltage transformers.

Description

Technical Field

[0001] This utility model belongs to the field of capacitive voltage transformers, specifically relating to a pressure relief and explosion-proof structure for an electromagnetic unit and a capacitive voltage transformer. Background Technology

[0002] As a crucial measurement and protection device in power systems, voltage transformers primarily function to convert high voltage to low voltage according to a certain ratio, thereby providing appropriate voltage signals for measuring instruments, protection devices, and other devices to achieve accurate monitoring and reliable protection of the power system.

[0003] Among the many types of voltage transformers, the common capacitive voltage transformer consists of an upper capacitive voltage divider and a lower electromagnetic unit. When the equipment malfunctions, such as a short circuit or insulation breakdown, the pressure inside the electromagnetic unit rises sharply. If the pressure is not released in time, excessive pressure may cause the electromagnetic unit casing to rupture, leading to an explosion and other serious accidents, damaging the equipment itself and potentially endangering the lives of surrounding personnel and the stable operation of the power system. Therefore, to ensure the safe and reliable operation of capacitive voltage transformers, a reasonable and effective pressure relief and explosion-proof structure needs to be designed at the electromagnetic unit to release pressure promptly when it becomes too high, preventing explosions. Simultaneously, since the electromagnetic unit of a capacitive voltage transformer typically uses an oil-immersed design, an oil level observation window needs to be designed at the electromagnetic unit to monitor the oil level. This observation window allows for a direct view of the oil level, enabling timely replenishment of insulating oil when the level is too low, ensuring the normal operation of the equipment.

[0004] However, currently, oil level observation windows and explosion-proof structures are mostly installed separately. This separate installation method has certain drawbacks: on the one hand, it increases the manufacturing and installation costs of the equipment, because two independent components need to be designed and installed separately; on the other hand, because the positions and structures of the two components are relatively independent, it may affect the overall sealing and stability of the equipment, increasing the risk of failure, and also making the maintenance and repair of the equipment more difficult. Utility Model Content

[0005] The technical problem solved by this utility model is to provide an explosion-proof pressure relief structure and a capacitive voltage transformer for electromagnetic units that integrates explosion-proof pressure relief function and oil level observation function, so that it can be used for both pressure safety release and oil level monitoring, thereby reducing equipment complexity and operation and maintenance costs, and providing a better solution for the safe and stable operation of capacitive voltage transformers.

[0006] To address the aforementioned technical problems, this invention provides a pressure relief and explosion-proof structure for electromagnetic units. This structure includes a pressure relief hole on the outer casing of the electromagnetic unit, with a pressure relief plate detachably mounted on the outside of the hole. The pressure relief plate is made of transparent material, and an oil level line is provided on its surface. By designing the pressure relief plate as transparent and providing an oil level line, this invention organically integrates explosion-proof pressure relief and oil level monitoring functions within a limited space. This allows the entire pressure relief and explosion-proof structure to not only provide pressure relief and explosion protection for the electromagnetic unit but also to observe the internal oil level. This simplifies the equipment structure, reduces maintenance costs, and decreases the frequency of equipment failures, ensuring the safe and stable operation of the capacitive voltage transformer.

[0007] Furthermore, a mounting base is fixedly installed on the outside of the pressure relief hole, and a mounting groove is provided on the end of the mounting base away from the pressure relief hole. The pressure relief plate is placed in the mounting groove. An annular pressure plate is placed on the outside of the pressure relief plate. The annular pressure plate is detachably connected to the mounting base by fasteners and securely installs the pressure relief plate in the mounting groove of the mounting base.

[0008] Furthermore, the mounting base has at least two threaded holes at the end furthest from the pressure relief hole, and the annular pressure plate has at least two mounting holes penetrating its surface. The end of the fastener penetrates the mounting hole and is threaded into the corresponding threaded hole, thereby detachably mounting the annular pressure plate and the mounting base together. Preferably, this invention can also have four threaded holes evenly distributed at the end of the mounting base, four mounting holes evenly distributed on the surface of the annular pressure plate, and four bolts used as fasteners to mount the annular pressure plate and the mounting base together.

[0009] Furthermore, the pressure relief plate has a mounting groove on its side wall, within which a sealing strip is embedded. This sealing strip is made of elastic materials such as silicone or rubber, and its outer side extends out of the mounting groove. When the pressure relief plate is assembled into the mounting groove of the mounting base, the sealing strip can elastically deform under the preload, filling the gap between the pressure relief plate and the mounting groove, forming a sealing barrier. This effectively prevents leakage of insulating oil and the intrusion of external moisture and dust, ensuring the airtightness of the internal environment of the electromagnetic unit.

[0010] Furthermore, the surface of the pressure relief plate is provided with pre-crack lines, and the pressure relief threshold can be precisely set and the rupture mode can be directionally guided by precisely controlling the geometric parameters of the pre-crack lines (such as depth, spacing, and direction).

[0011] Furthermore, the pressure relief plate is made of polycarbonate, a common PC material on the market. This material not only possesses high strength, enabling it to withstand high-pressure environments, and high light transmittance, meeting the needs of oil level observation, but it can also be processed into parts through injection molding, thereby significantly improving the production efficiency of the pressure relief plate.

[0012] Furthermore, the mounting base is made of stainless steel, and it can be fixedly installed on the outer shell of the electromagnetic unit by welding.

[0013] Furthermore, the annular pressure plate is made of stainless steel and has excellent properties such as high strength, high hardness, and corrosion resistance.

[0014] On the other hand, this utility model also provides a capacitive voltage transformer, which includes an electromagnetic unit. The electromagnetic unit is provided with the aforementioned pressure relief and explosion-proof structure for the electromagnetic unit. Through the aforementioned pressure relief and explosion-proof structure for the electromagnetic unit, the complexity of the equipment and the operation and maintenance costs can be reduced, providing a better solution for the safe and stable operation of the capacitive voltage transformer.

[0015] Furthermore, a capacitor voltage divider is installed above the electromagnetic unit, and the capacitor voltage divider is a fully sealed structure filled with capacitor oil; the electromagnetic unit is a top-open structure and is filled with transformer oil; and when the capacitor voltage divider and the electromagnetic unit are combined, the bottom flange of the capacitor voltage divider seals the electromagnetic unit, at which point the electromagnetic unit is in a fully sealed state.

[0016] As can be seen from the above technical solutions, this utility model has the following advantages: By integrating the pressure relief and explosion-proof structure with the oil level observation structure into one unit, this utility model achieves both structural simplification and cost optimization. Specifically, it eliminates the need for additional structures such as oil level observation windows, thereby reducing material costs by approximately 20% and shortening assembly time by more than 30% while reducing the complexity of the housing processing. Moreover, this structural simplification effectively avoids stress concentration problems caused by multiple interfaces, improving the overall mechanical strength of the electromagnetic unit's housing, making it particularly suitable for ultra-high voltage equipment scenarios with limited space. On the other hand, it can create synergistic advantages in improving operation and maintenance efficiency and enhancing safety performance, shortening the time for maintenance personnel during a single maintenance, and providing a more economical and forward-looking technical solution for the application of capacitive voltage transformers in high-reliability power grids. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0019] Figure 2 This is an exploded view of the annular pressure plate, pressure relief plate, mounting base, and fasteners in this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0021] In the diagram: 1. Housing shell; 2. Annular pressure plate; 3. Pressure relief plate; 4. Mounting base; 5. Threaded hole; 6. Sealing strip; 7. Oil level line; 8. Mounting hole; 9. Pre-crack line; 10. Fastener; 11. Mounting groove; 12. Capacitor voltage divider; 13. Pressure relief and explosion-proof structure for electromagnetic unit; 14. Electromagnetic unit. Detailed Implementation

[0022] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] Example 1

[0024] like Figure 1 , Figure 2 As shown in the figure, this embodiment provides a pressure relief and explosion-proof structure for an electromagnetic unit. This pressure relief and explosion-proof structure for an electromagnetic unit is used in a capacitive voltage transformer to ensure that the capacitive voltage transformer can operate safely and reliably.

[0025] Specifically, such as Figure 1 As shown, the pressure relief and explosion-proof structure for the electromagnetic unit provided in this embodiment includes a pressure relief hole on the outer shell 1 of the electromagnetic unit 14. The pressure relief hole serves as both a pressure relief hole and an oil level observation window. An annular mounting base 4 is welded to the outside of the pressure relief hole. The mounting base 4 is preferably made of stainless steel. A mounting groove 11 is provided at the end of the mounting base 4 away from the pressure relief hole. A pressure relief plate 3 is placed in the mounting groove 11. The pressure relief plate 3 is a transparent flat plate structure made of polycarbonate (PC) material with high light transmittance. An oil level line 7 and a pre-crack line 9 are provided on the surface of the pressure relief plate 3.

[0026] The oil level line 7 can be made using laser etching or fluorescent coating processes and is used to accurately mark the normal liquid level range of the insulating oil inside the electromagnetic unit 14. It can be located on either the inner or outer surface of the pressure relief plate 3; its specific scale value can be represented by a temperature value. The pre-crack line 9 can be processed using laser engraving or chemical etching processes. During its processing, the precise setting of the pressure relief threshold and the directional guidance of the rupture pattern can be achieved by accurately controlling the geometric parameters (such as depth, spacing, and direction) of the pre-crack line 9. Specifically, in this embodiment, the depth of the pre-crack line 9 can be controlled within the range of 1 / 3 to 1 / 2 of the thickness of the pressure relief plate 3. This ensures the structural integrity of the pressure relief plate 3 under normal working pressure and, when the internal pressure reaches the design threshold, guarantees that the pressure relief plate 3 preferentially develops directional cracks along the pre-crack line 9, avoiding fragmentation or blockage of the pressure relief channel caused by irregular rupture. Meanwhile, the layout of the pre-crack line 9 can also be optimized according to the pressure field distribution inside the electromagnetic unit 14. For example, the density of the pre-crack line 9 can be increased in the pressure concentration area (such as the position corresponding to the end of the winding), or a radial or grid-like combination pattern can be used so that the pressure relief plate 3 forms a regular fan-shaped or petal-shaped opening when it breaks, ensuring that the pressure relief area is maximized and the airflow jet direction is controllable.

[0027] The pressure relief plate 3 has a mounting groove on its side wall, and a sealing strip 6 is embedded in the mounting groove. The outer side of the sealing strip 6 extends out of the mounting groove and can be made of elastic materials such as silicone or rubber. When the pressure relief plate 3 is assembled into the mounting groove 11 of the mounting base 4, the sealing strip 6 fills the gap between the pressure relief plate 3 and the mounting groove 11, forming a sealing barrier to effectively prevent leakage of insulating oil and the intrusion of external moisture and dust, ensuring the airtightness of the internal environment of the electromagnetic unit 14. Preferably, the sealing strip 6 can be directly placed into the corresponding mold during the injection molding process of the pressure relief plate 3, so that the two are integrally formed through insert injection molding, thereby simplifying the subsequent installation process and eliminating the need for a separate sealing ring.

[0028] A stainless steel annular pressure plate 2 is placed on the outer side of the pressure relief plate 3. The annular pressure plate 2 is detachably connected to the mounting base 4 by fasteners 10, and the pressure relief plate 3 is securely installed in the mounting groove 11 of the mounting base 4. Specifically, in this embodiment one, as... Figure 1 , Figure 2 As shown, in this embodiment, at least two threaded holes 5 are evenly provided on the end of the mounting base 4 away from the pressure relief hole, and at least two mounting holes 8 are evenly provided through the surface of the annular pressure plate 2. The end of the fastener 10 is threaded through the mounting hole 8 and then threadedly connected to the corresponding threaded hole 5, so that the annular pressure plate 2 and the mounting base 4 can be detachably installed together, and the pressure relief plate 3 is fixed.

[0029] Based on this, this embodiment can achieve "multi-purpose use" of the entire structure through innovative structural design. That is, the pressure relief and explosion-proof structure of the electromagnetic unit in this embodiment can be used as a pressure relief structure and also as an oil level observation window, so that maintenance personnel can directly judge whether the oil level of the electromagnetic unit 14 is normal under ambient temperature. Moreover, on this basis, this embodiment can also achieve the goals of simplifying equipment structure, reducing equipment maintenance costs, reducing the number of equipment failures, and ensuring the safe and stable operation of the capacitive voltage transformer.

[0030] Example 2

[0031] like Figure 3 As shown, this embodiment two provides a capacitive voltage transformer, which includes an electromagnetic unit 14 and a capacitive voltage divider 12. The electromagnetic unit 14 has a top-opening structure and is filled with transformer oil. Its external casing 1 is equipped with the pressure relief and explosion-proof structure for the electromagnetic unit described in embodiment one. This pressure relief and explosion-proof structure reduces equipment complexity and maintenance costs, providing a better solution for the safe and stable operation of the capacitive voltage transformer.

[0032] The capacitor voltage divider 12 is a fully sealed structure and is filled with capacitor oil. Moreover, when the capacitor voltage divider 12 is combined with the electromagnetic unit 14, the base flange of the capacitor voltage divider 12 seals the electromagnetic unit 14, at which time the electromagnetic unit 14 is in a fully sealed state.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be 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 pressure relief and explosion-proof structure for an electromagnetic unit, comprising a pressure relief hole on the outer shell (1) of the electromagnetic unit (14), wherein a pressure relief plate (3) is detachably installed on the outside of the pressure relief hole, characterized in that, The pressure relief plate (3) is made of transparent material, and an oil level line (7) is provided on the surface of the pressure relief plate (3).

2. The pressure relief and explosion-proof structure for electromagnetic units according to claim 1, characterized in that, An installation base (4) is fixedly installed on the outside of the pressure relief hole. An installation groove (11) is provided on the end of the installation base (4) away from the pressure relief hole. The pressure relief plate (3) is placed in the installation groove (11). An annular pressure plate (2) is placed on the outside of the pressure relief plate (3). The annular pressure plate (2) is detachably connected to the installation base (4) by fasteners (10).

3. The pressure relief and explosion-proof structure for electromagnetic units according to claim 2, characterized in that, At least two threaded holes (5) are provided on the end of the mounting base (4) away from the pressure relief hole. At least two mounting holes (8) are provided on the surface of the annular pressure plate (2). The end of the fastener (10) is threaded through the mounting hole (8) and then threaded into the corresponding threaded hole (5).

4. The pressure relief and explosion-proof structure for electromagnetic units according to any one of claims 1-3, characterized in that, The side wall of the pressure relief plate (3) is provided with a ring of mounting grooves, and a sealing strip (6) is embedded in the mounting grooves.

5. The pressure relief and explosion-proof structure for electromagnetic units according to any one of claims 1-3, characterized in that, The surface of the pressure relief plate (3) is provided with pre-crack lines (9).

6. The pressure relief and explosion-proof structure for electromagnetic units according to any one of claims 1-3, characterized in that, The pressure relief plate (3) is made of polycarbonate.

7. The pressure relief and explosion-proof structure for electromagnetic units according to claim 2 or 3, characterized in that, The mounting base (4) is made of stainless steel.

8. The pressure relief and explosion-proof structure for an electromagnetic unit according to claim 2 or 3, characterized in that, The material of the annular pressure plate (2) is stainless steel.

9. A capacitive voltage transformer, comprising an electromagnetic unit (14), characterized in that, The electromagnetic unit (14) is provided with a pressure relief and explosion-proof structure for the electromagnetic unit according to any one of claims 1-8.

10. The capacitive voltage transformer according to claim 9, characterized in that, A capacitor voltage divider (12) is installed above the electromagnetic unit (14).

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