Outdoor dead tank pole built-in isolation and conducting device

Abstract

The utility model discloses an outdoor fixed sealing pole built-in isolation conducting device, include: the upper outgoing line flange, with the isolation static contact of fixed sealing pole electricity is connected, and the inside is equipped with the card slot, double helical spring contact finger subassembly, and the card is installed in the card slot of upper outgoing line flan, and the dynamic isolation conducting rod, and the upper end forms the elastic contact with double helical spring contact finger subassembly, and the lower end extends the fixed sealing pole, and the lower outgoing line flange is connected with the bottom of dynamic isolation conducting rod. The utility model has the following beneficial effects: through double helical spring contact finger design and built-in isolation function, realized low contact resistance, low temperature rise, high dynamic thermal stability and structure integration, effectively solved the problem that traditional binding type contact contact pressure is uneven, and contact resistance is big, and temperature rise is high and dynamic thermal stability is insufficient.

Description

Technical Field

[0001] This utility model relates to an outdoor solid-sealed pole with built-in isolation conductive device, which is particularly suitable for outdoor high-voltage switchgear, such as ZW32 type solid-sealed pole switches, load switches or disconnector switch combinations. Background Technology

[0002] In the field of outdoor high-voltage switchgear, solid-sealed poles are the basic insulation support and electrical connection units. In existing high-voltage switchgear, the isolating device is often designed externally, resulting in a complex overall structure and large size. Furthermore, existing conductive contact systems, especially bundled contact structures, suffer from several technical defects under high-current conditions.

[0003] Traditional bundled contacts typically use multiple contact pieces held together circumferentially by a small tension spring to form contact. Under rated short-time current / dynamic stability current (e.g., 20kA level), serious problems often arise: First, insufficient effective conductor cross-sectional area leads to excessively high contact resistance; second, uneven contact surface and significant fretting wear issues result in abnormal temperature rise and insufficient dynamic and thermal stability; third, the structure is mostly a split design with a long assembly chain, leading to poor consistency and complex maintenance.

[0004] With the growing market demand for miniaturized, integrated solid-sealed terminals, especially for products that integrate isolation functions while simultaneously meeting requirements for low contact resistance, constant force contact, high current resistance, and low temperature rise, current technology struggles to achieve these comprehensive performance characteristics within a confined cavity, thus hindering improvements in product reliability and miniaturization.

[0005] Therefore, there is an urgent need for a new structural solution that can integrate isolation function inside the solid-sealed pole while possessing good conductivity and dynamic and thermal stability, in order to meet the requirements of modern high-voltage switchgear for reliability, miniaturization and integration. Utility Model Content

[0006] The purpose of this invention is to provide an outdoor solid-sealed electrode post with built-in isolation conductive device. This outdoor solid-sealed electrode post with built-in isolation conductive device features low contact resistance, low temperature rise, high dynamic and thermal stability, and integrated structure.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0008] An outdoor solid-sealed pole with built-in isolation conductive device, comprising:

[0009] The upper outgoing flange is electrically connected to the isolating stationary contact of the solid-sealed pole, and a slot is provided on the inner side;

[0010] The double helical spring contact finger assembly is snapped into the slot of the upper cable outlet flange;

[0011] The dynamic isolation conductive rod has an upper end that forms an elastic contact with the double helical spring contact finger assembly, and a lower end that extends out as a solid-sealed pole.

[0012] The lower outlet flange is connected to the bottom of the dynamic isolation conductive rod.

[0013] The present invention is further configured such that: the double helical spring contact finger assembly includes two sets of coaxial or staggered helical spring contact fingers to form circumferential multi-point contact.

[0014] The present invention is further configured such that the cross-section of the helical spring contact finger is elliptical or oblique, so as to maintain an approximately constant elastic force output within a large compression stroke.

[0015] The present invention is further configured such that the cross-section of the helical spring contact finger is elliptical or oblique, so as to maintain a constant elastic force output within the compression stroke.

[0016] The present invention is further configured such that: the slot of the upper outlet flange is an annular groove, and the outer periphery of the double helical spring contact finger assembly engages and is fixed with the slot.

[0017] The present invention is further configured such that: the lower outlet flange is provided with an external electrical connection interface, which is mechanically connected to the moving knife assembly of the solid-sealed pole.

[0018] The present invention is further configured such that the double helical spring contact finger assembly is fixed in the slot by a double positioning of a retaining ring and a pressure ring.

[0019] This utility model is further configured such that the isolation stationary contact of the solid-sealed pole, the dynamic isolation conductive rod, the upper outlet flange and the lower outlet flange form a short-path conductive circuit with fewer contact points, so that the overall structure can achieve functional integration without increasing the external size.

[0020] In summary, this utility model has the following beneficial effects:

[0021] Low contact resistance and low temperature rise: The circumferential multi-point pressure equalization design of the double helical spring contact finger assembly significantly increases the contact area with the dynamically isolating conductive rod, forming a uniformly distributed contact pressure and significantly reducing contact resistance. The two sets of parallel helical spring contact fingers provide redundant conductive paths, increasing the effective conductor cross-sectional area. According to Joule's law (I²R), heat generation is reduced under the same current conditions, and the temperature rise is significantly reduced, solving the problem of abnormal temperature rise in traditional bundled contacts.

[0022] High dynamic and thermal stability: The elliptical or oblique cross-section design of the spring contacts maintains a nearly constant spring force output over a large compression stroke, making the contact system insensitive to assembly tolerances and thermal expansion. Under short-circuit current impact, the spring contacts can absorb part of the impact energy, maintain contact stability, improve the dynamic stability limit, and significantly enhance the reliability of the system under high current conditions.

[0023] Integrated Structure: The isolation function is integrated inside the solid-sealed pole, forming a compact, integrated structure that shortens the conductive circuit length and reduces the number of contacts. The isolating stationary contact, the moving isolating conductive rod, and the upper and lower outgoing flanges form a short-path, low-contact conductive circuit, achieving functional integration without increasing the overall size, and significantly improving the product's integration and miniaturization level.

[0024] Easy installation and maintenance: The double-helix spring contact finger assembly simplifies the assembly process with its slot-fixed design. The dual positioning method of the retaining ring and pressure ring improves fixing reliability, avoiding the problems of loose contact fixing and difficult assembly common with traditional contacts. The standardized upper and lower cable outlet flanges standardize the external wiring interface, simplifying installation and replacement processes and improving the convenience of on-site operation.

[0025] High environmental adaptability: The sealing and guiding components simultaneously provide dust and moisture protection as well as motion guidance, enhancing the product's adaptability to harsh outdoor environments. The chamfered or rounded corner design of the dynamic isolation conductive rod reduces wear on the contact finger assembly, extending product lifespan and lowering maintenance frequency and costs.

[0026] Economic advantages: The integrated structural design reduces the number of components and assembly steps, simplifies the production process, and lowers manufacturing costs. The double-helix spring contact design optimizes the utilization efficiency of conductive materials and improves the performance per unit material. Improved system reliability directly extends equipment lifespan and reduces total life cycle costs, resulting in significant economic benefits. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 for Figure 1 Side view;

[0029] Figure 3 for Figure 1 A sectional view;

[0030] Figure 4 for Figure 3 Enlarged view of region A in the image.

[0031] Reference numerals: 30-Upper outlet flange; 31-Slot; 40-Double helical spring contact finger assembly; 50-Dynamically isolating conductive rod; 60-Lower outlet flange. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] An outdoor solid-sealed electrode post with an internal insulating conductive device is disposed within the solid-sealed electrode post. The solid-sealed electrode post has a through-hole cavity to accommodate the insulating conductive device described herein. The solid-sealed electrode post is cast from epoxy resin and is cylindrical in shape. Creepage distances are formed on the outer surface to ensure insulation performance. This is prior art and will not be described in detail.

[0034] like Figure 1 As shown, the isolating stationary contact is fixedly installed at the upper end of the inner cavity of the solid-sealed pole, and a contact surface matching the moving isolating conductive rod 50 is provided in the middle. The isolating stationary contact is fixedly connected to the upper outgoing flange 30, forming part of the upper electrical circuit.

[0035] like Figure 2 , Figure 3 As shown, the upper cable outlet flange 30 is a metal annular structure, and a groove 31 is provided on the inner side of the upper cable outlet flange 30, such as... Figure 2 As shown, the slot 31 is an annular groove used to fix the double helical spring contact finger assembly 40. A connection interface is provided on the outside of the flange for connection to an external electrical circuit.

[0036] like Figure 4 As shown, the double helical spring contact finger assembly 40 is the core structure of this utility model, comprising two sets of coaxially or staggered helical spring contact fingers, each set of helical springs consisting of 5-8 turns of elastic conductive material. The contact finger cross-section is elliptical or obliquely coiled, with a major axis of approximately 1.5mm and a minor axis of approximately 0.8mm, thereby enabling the contact finger to maintain a nearly constant elastic force output of approximately 5-8N within a compression stroke of about 5mm. The outer periphery of the double helical spring contact finger assembly 40 is engaged and fixed with the groove 31 of the upper outlet flange 30, and can be doubly positioned by a retaining ring and a pressure ring to prevent axial displacement or rotation of the contact finger assembly during operation. The inner periphery of the contact finger forms elastic contact with the dynamic isolation conductive rod 50, generating uniform circumferential contact pressure.

[0037] The moving isolating conductive rod 50 is a cylindrical metal rod. Its upper end has a contact area that mates with the double-helix spring contact finger assembly 40. The lower end of the conductive rod connects to the lower outlet flange 60 and the moving knife assembly of the solidified terminal post. The conductive rod can move axially by approximately 30-50 mm to achieve contact and separation with the isolating stationary contact, thereby completing the isolation function.

[0038] The lower outlet flange 60 is connected to the bottom of the dynamic isolation conductive rod 50, forming a ring or disc shape. It has an external electrical connection interface and is mechanically connected to the moving knife assembly, forming part of the lower electrical circuit. In addition, the lower outlet flange 60 is also internally connected to the double helical spring contact finger assembly 40, forming a two-point contact.

[0039] The moving blade assembly is driven by an external mechanism, which moves the moving isolation conductive rod 50 axially to achieve isolation and separation operations.

[0040] The sealing and guiding component is fitted around the outer periphery of the dynamic isolation conductive rod 50, and cooperates with the inner wall of the solid sealing post to form a sealing structure. This component provides guidance for the axial movement of the dynamic isolation conductive rod 50, ensuring smooth movement and centering.

[0041] During operation, when the isolating switch needs to be closed, the external operating mechanism drives the moving blade assembly through the mechanism interface, causing the moving isolating conductive rod 50 to move upward. The upper end of the moving isolating conductive rod 50 first contacts the double helical spring contact finger assembly 40, forming the first-stage conductive path; after continuing to move to the final position, the upper end of the moving isolating conductive rod 50 contacts the isolating stationary contact, forming the second-stage conductive path. At this time, the current passes through the isolating stationary contact, the upper outlet flange 30, the double helical spring contact finger assembly 40, the moving isolating conductive rod 50, and the lower outlet flange 60 to form a complete conductive circuit.

[0042] When it is necessary to disconnect the disconnecting switch, the operation sequence is reversed. The moving disconnecting conductive rod 50 moves downward, first separating from the disconnecting stationary contact, then separating from the double helical spring contact finger assembly 40, and finally completely disconnecting the electrical circuit to achieve the isolation function.

[0043] Throughout the entire operation, the double-helix spring contact finger assembly 40 maintains uniform contact pressure on the moving isolating conductive rod 50, ensuring low contact resistance and stable conductivity even during dynamic processes. The seal and guide 80 ensures smooth movement of the moving isolating conductive rod 50 and environmental sealing.

[0044] This utility model achieves low contact resistance, low temperature rise, high dynamic and thermal stability, and integrated structure through a double helical spring contact design and built-in isolation function. It effectively solves various problems of traditional bundled contacts under high current conditions and is particularly suitable for outdoor high-voltage switchgear, such as ZW32 type solid-sealed pole switches, load switches, or disconnector switch combinations.

[0045] This verification scheme tests the core technical performance of the built-in isolation conductive device in outdoor solid-sealed poles: contact resistance and temperature rise performance, dynamic and thermal stability, structural compactness and operational reliability.

[0046] 1. A comparative testing method was adopted to directly compare this device with a traditional bundled contact structure. The test samples included three sets of this device and three sets of traditional bundled contact samples of the same specifications, all tested under the same environment and conditions. The testing equipment included a micro-ohmmeter, an infrared thermal imager, a temperature recorder, a short-circuit current generator, an aging test chamber, and a mechanical operating life test bench.

[0047] 2. Comparison of Technical Effects

[0048]

[0049] 3. Verification Methods and Testing Procedures

[0050] 3.1 Contact Resistance and Temperature Rise Test

[0051] Contact resistance was measured using the four-terminal method. The device was continuously energized for 8 hours under rated current conditions, with temperature data recorded every 30 minutes. Traditional contacts showed a significant temperature rise after 6 hours of continuous energization, while the temperature rise curve of this device remained stable, with the final steady-state temperature rise being approximately 25-30K lower than that of traditional contacts.

[0052] 3.2 Dynamic and thermal stability test

[0053] Using a short-circuit current generator, a short-time withstand current test was conducted according to IEC standards, gradually increasing the current intensity until the sample could no longer maintain stable contact. The results showed that conventional contacts began to exhibit contact instability under 20kA / 2s conditions, while this device could reliably withstand a 30kA / 2s short-circuit current, improving the dynamic stability limit by approximately 50%.

[0054] 3.3 Structural compactness and operational reliability testing

[0055] Rapid temperature change testing (-40℃ to +70℃, 50 cycles) and salt spray testing (1000 hours) were conducted, combined with mechanical operating life testing. Under harsh conditions, conventional contacts showed significant contact failure after 5000 operations, while this device maintained good contact performance after 15000 operations.

[0056] 3.4 Long-term stability test

[0057] The test simulated long-term operation under actual working conditions, alternating between load-bearing and mechanical operation, while simultaneously measuring changes in contact resistance. The results showed that the contact resistance of a conventional contact increased by approximately 40% during the test, while that of this device increased by only approximately 10%, indicating a significantly improved long-term stability.

[0058] 4. Verification Conclusion

[0059] Experimental results demonstrate that the outdoor solid-sealed terminal block with its built-in isolation conductive device, through its double-helix spring contact finger structure and integrated design, achieves significant performance improvements compared to traditional bundled contacts: contact resistance is reduced by approximately 67%, temperature rise by approximately 55%, dynamic stability limit is increased by 50%, assembly time is reduced by approximately 67%, and mechanical operating life is increased by 200%. These performance improvements enable the product to have higher reliability and stability under high current conditions, making it particularly suitable for demanding outdoor high-voltage switchgear environments. Simultaneously, the integrated design significantly improves product integration, simplifies assembly and maintenance processes, reduces total lifecycle costs, and meets the miniaturization and high reliability requirements of modern high-voltage switchgear.

Claims

1. An outdoor solid-sealed pole with built-in isolation conductive device, characterized in that, include: The upper outgoing flange (30) is electrically connected to the isolation stationary contact of the solid-sealed pole, and has a slot (31) on the inside; The double helical spring contact finger assembly (40) is snapped into the slot (31) of the upper outlet flange (30); The upper end of the dynamic isolation conductive rod (50) forms an elastic contact with the double helical spring contact finger assembly (40), and the lower end extends out of the solid-sealing pole. The lower outlet flange (60) is connected to the bottom of the dynamic isolation conductive rod (50).

2. The outdoor solid-sealed pole with built-in isolation conductive device according to claim 1, characterized in that, The double helical spring contact finger assembly (40) includes two sets of coaxial or staggered helical spring contact fingers to form circumferential multi-point contact.

3. The outdoor solid-sealed pole with built-in isolation conductive device according to claim 2, characterized in that, The cross-section of the helical spring contact finger is elliptical or oblique, maintaining a constant spring force output within the compression stroke.

4. The outdoor solid-sealed pole with built-in isolation conductive device according to claim 1, characterized in that, The slot (31) of the upper outlet flange (30) is an annular groove, and the outer periphery of the double helical spring contact finger assembly (40) is engaged and fixed with the slot (31).

5. The outdoor solid-sealed pole with built-in isolation conductive device according to claim 1, characterized in that, The lower outlet flange (60) is provided with an external electrical connection interface, which is mechanically connected to the moving knife assembly of the solid-sealed pole.

6. The outdoor solid-sealed pole with built-in isolation conductive device according to claim 1, characterized in that, The double helical spring finger assembly (40) is fixed in the slot (31) by a double positioning of a retaining ring and a pressure ring.

7. The outdoor solid-sealed pole with built-in isolation conductive device according to claim 1, characterized in that, The solid-sealed pole's isolating static contact, moving isolating conductive rod (50), upper outlet flange (30), and lower outlet flange (60) form a short-path, low-contact conductive circuit, enabling the overall structure to achieve functional integration without increasing its external dimensions.

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