Incoming and outgoing line terminal of pole-mounted circuit breaker

Abstract

The utility model discloses an incoming and outgoing line terminal of a pole-mounted circuit breaker, and the terminal comprises a terminal board which is designed in a symmetrical structure; the semi-closed hoop is arranged at the central position of the terminal board, the semi-closed hoop adopts a semi-closed annular structure, and a gap is reserved at an opening of the semi-closed hoop; the conducting rod connecting part is positioned on the inner side of the semi-closed hoop and is used for forming semi-enclosed clamping connection with the conducting rod; the clamping device is arranged on the semi-closed hoop and is used for adjusting the clamping force on the conducting rod; wherein the semi-closed hoop and the conducting rod form a semi-enclosed clamping state, and the outline of the terminal plate is matched with the heat shrink tube to wrap. The pole-mounted circuit breaker incoming and outgoing line terminal has the following beneficial effects that the pole-mounted circuit breaker incoming and outgoing line terminal has the characteristics of excellent moisture-proof and anti-oxidation performance, good compatibility of a heat shrink tube and universality of the incoming and outgoing line terminal.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, specifically to a pole-mounted circuit breaker input / output terminal. Background Technology

[0002] Pole-mounted circuit breakers, as important switching equipment in power distribution networks, are widely used in outdoor power distribution lines with voltage levels of 10kV and below. Their main function is to connect and disconnect load current during normal operation and to quickly interrupt short-circuit current under fault conditions, thus protecting the safe operation of the power distribution system. The incoming and outgoing terminals are key components connecting the pole-mounted circuit breaker to the transmission line; their connection quality and reliability directly affect the safe and stable operation of the entire power system.

[0003] Existing pole-mounted circuit breaker terminals primarily employ traditional conductive rod clamp structures. While this design is relatively simple to manufacture, it reveals numerous technical defects and safety hazards in practical applications. Firstly, the contact surfaces of traditional terminals are completely exposed to the outdoor environment, lacking effective protective design. This allows external factors such as rainwater, moisture, and dust to easily penetrate along the contact gaps, leading to gradual oxidation and corrosion of the contact surfaces. This results in increased contact resistance, poor contact, and abnormal heating, and in severe cases, may even cause fires.

[0004] Secondly, traditional incoming and outgoing terminals employ drastically different structural designs. Incoming terminals often use an angled terminal structure, while the clamping position of outgoing terminals is particularly prominent. This structural difference not only increases the complexity and probability of errors during on-site installation but also makes it impossible to use heat-shrink tubing or cold-shrink tubing for effective protective covering. When moisture-proof and oxidation-proof protection of the terminals is required, only expensive insulating silicone covers can be used to completely cover the incoming and outgoing terminals.

[0005] Furthermore, the traditional terminal structure has a low degree of standardization, requiring separate design and manufacturing of incoming and outgoing terminals. This not only increases production costs and inventory management complexity but also reduces the efficiency and convenience of on-site installation. These technical issues have become significant bottlenecks restricting the improvement of the reliability and maintenance convenience of pole-mounted circuit breakers. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a pole-mounted circuit breaker input and output terminal that achieves excellent moisture and oxidation resistance, good heat shrink tubing compatibility, and universality of input and output terminals, thereby solving the technical defects and safety hazards of traditional terminals.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A pole-mounted circuit breaker input / output terminal includes: a terminal plate with a symmetrical structural design; a semi-enclosed clamp located at the center of the terminal plate, the semi-enclosed clamp having a semi-enclosed annular structure with a gap at the opening; a conductive rod connecting part located inside the semi-enclosed clamp for forming a semi-enclosed clamping connection with the conductive rod; and a clamping device located on the semi-enclosed clamp for adjusting the clamping force on the conductive rod; wherein the semi-enclosed clamp and the conductive rod form a semi-enclosed clamping state, and the outer contour of the terminal plate is adapted to be covered with heat shrink tubing.

[0009] Furthermore, the inner surface of the semi-enclosed clamp is a contact surface, forming a multi-point contact connection with the circular cross-section of the conductive rod.

[0010] Furthermore, the connection gap between the conductive rod and the conductive rod adopts an overlapping structure to reduce the contact area directly exposed to the outside.

[0011] Furthermore, the outer surface of the terminal block features a smooth transition design to prevent sharp edges from damaging the heat shrink tubing.

[0012] Furthermore, the semi-enclosed clamp forms a moisture barrier to prevent external moisture from intruding along the contact gap.

[0013] Furthermore, the incoming and outgoing terminals adopt the same structural design to achieve universal interchangeability.

[0014] Furthermore, the radial protrusion dimension of the semi-enclosed clamp is smaller than that of the conventional edge clamp.

[0015] Furthermore, the clamping device is a bolt fastening mechanism, which can be used to adapt and clamp conductive rods of different specifications by adjusting the bolts.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Significantly improved moisture and oxidation resistance: The semi-enclosed clamp structure forms a natural moisture barrier, effectively blocking the intrusion of external moisture. Combined with heat shrink tubing, it forms a dual protection system, improving moisture and oxidation resistance.

[0018] Improved installation convenience: The incoming and outgoing terminals adopt the same structural design, eliminating the need for differentiation during installation, improving installation efficiency and reducing the error rate.

[0019] Manufacturing costs are effectively reduced: The unified structural design reduces mold and manufacturing costs and lowers the complexity of inventory management.

[0020] Significantly enhanced connection reliability: The semi-enclosed clamping connection increases the contact area, and the contact surface design improves the stability and vibration resistance of the mechanical connection. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below:

[0022] Figure 1 This is a schematic diagram of the overall structure of the input and output terminals of the pole-mounted circuit breaker of this utility model;

[0023] Figure 2 for Figure 1 The front view;

[0024] Figure 3 for Figure 1 A side view half-section diagram;

[0025] Figure 4 This is a schematic diagram showing the connection relationship between the pole-mounted circuit breaker and the incoming and outgoing terminals.

[0026] Figure 5 for Figure 4 Enlarged view of region A in the image;

[0027] Figure 6 for Figure 4 Enlarged view of region B in the image;

[0028] Figure 7 This is a schematic diagram of the incoming terminal structure in the prior art;

[0029] Figure 8 This is a schematic diagram of the outgoing terminal structure in the prior art.

[0030] Reference numerals: 1. Terminal block; 2. Semi-enclosed clamp; 3. Gap; 4. Conductive rod connection part; 5. Conductive rod; 6. Clamping device; 7. Fitting surface; 9. Smooth transition design; 10. Moisture barrier; 12. Bolt fastening mechanism. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0032] Example 1: Basic Structure

[0033] like Figure 1 As shown, this utility model provides a pole-mounted circuit breaker input and output terminal, which mainly includes core components such as a terminal plate (1), a semi-enclosed clamp (2), a conductive rod connecting part (4), and a clamping device (6).

[0034] like Figure 2As shown, the terminal block (1) adopts a symmetrical structure design to ensure a uniform distribution of mechanical strength. The outer surface of the terminal block (1) adopts a smooth transition design (9), and all edges and corners are rounded to avoid damage to the heat shrink tubing from sharp edges, ensuring that the heat shrink tubing can fit tightly and form an effective seal.

[0035] The semi-enclosed clamp (2) is the core structure of this utility model, and it is located at the center of the terminal plate (1) instead of the traditional edge position. The semi-enclosed clamp (2) adopts a semi-enclosed ring structure with a gap (3) at the opening, which facilitates the insertion and installation of the conductive rod (5) and forms an effective moisture barrier (10). The design at the center position significantly reduces the overall radial protrusion dimension of the terminal (e.g., Figure 7 , Figure 8 The diagram shows the structure of the inlet and outlet terminals, with the clamp protruding, which solves the problem of the traditional clamp's abnormal protrusion affecting the heat shrink tubing coverage.

[0036] like Figure 3 As shown, the conductive rod connecting part (4) is located inside the semi-enclosed clamp (2) and is used to form a semi-enclosed clamping (with gap 3) connection with the conductive rod (5). The inner surface of the semi-enclosed clamp (2) is designed as a mating surface (7), which forms a geometric fit with the circular cross-section of the conductive rod (5), realizing multi-point contact connection, greatly increasing the effective contact area, and significantly reducing the contact resistance.

[0037] The clamping device (6) is installed on the semi-enclosed clamp (2) and is used to adjust the clamping force on the conductive rod (5). In the preferred embodiment, the clamping device (6) adopts the form of a bolt fastening mechanism (12). By adjusting the tightness of the bolt, it can adapt and clamp conductive rods (5) of different specifications, which not only ensures the reliability of the connection, but also improves the versatility of the product.

[0038] Example 2: Moisture-proof and protective structure

[0039] like Figure 4 As shown, the connection gap between the conductive rod connecting part (4) and the conductive rod (5) adopts an overlapping structure, which reduces the contact area of ​​the conductive rod (5) directly exposed to the external environment.

[0040] The moisture barrier (10) formed by the semi-enclosed clamp (2) constitutes the first layer of mechanical protection, and its moisture-proof performance is significantly better than that of the traditional fully exposed structure, even without covering the heat shrink tubing. This natural protective barrier can effectively block the direct intrusion of external factors such as rainwater, moisture and dust, providing basic protection for the core connection parts.

[0041] Example 3: Heat Shrink Tubing Compatibility

[0042] like Figure 5As shown, the outline of the terminal block (1) is perfectly adapted to the heat shrink tubing coverage. Because the semi-enclosed clamp (2) is positioned in the center, eliminating the obstruction of traditional edge clamps, the heat shrink tubing can be smoothly inserted and completely cover the entire connection area, forming a second layer of sealing protection. The synergistic effect of the dual protection system significantly improves the overall moisture-proof and oxidation-proof performance.

[0043] Example 4: Universal Design

[0044] A key feature of this invention is that the inlet and outlet terminals adopt identical structural designs, achieving universal interchangeability. This standardized design not only eliminates the need to distinguish between inlet and outlet terminals during on-site installation, significantly simplifying installation operations and reducing the probability of errors, but also offers significant economic benefits: it greatly simplifies the manufacturing process, reduces the number of molds and manufacturing steps, and lowers production costs. Simultaneously, the complexity of inventory management is significantly reduced, as there is no need to store inlet and outlet terminals separately, improving inventory turnover efficiency and management convenience.

[0045] Example 5: Installation and Maintenance Method

[0046] The installation method of the pole-mounted circuit breaker's incoming and outgoing terminals of this utility model includes the following detailed steps:

[0047] Preparation stage: Check the cleanliness of the surface of the conductive rod (5) to ensure that there is no oil, rust or other contaminants, and clean it if necessary.

[0048] Installation and positioning: Insert the conductive rod (5) into the opening gap (3) of the semi-enclosed clamp (2) so that the conductive rod (5) is in full contact with the mating surface (7) to ensure the accuracy of the geometric fit.

[0049] Clamping adjustment: Use bolt fastening mechanism (12) to apply appropriate clamping force to conductive rod (5). The magnitude of clamping force should be adjusted according to the specifications and material of conductive rod (5) to ensure connection stability and avoid deformation caused by excessive clamping.

[0050] Protective covering: According to environmental requirements and protection level requirements, heat shrink tubing of the appropriate specification is wrapped around the outside of the terminal to ensure that the heat shrink tubing completely covers the connection area.

[0051] Quality verification: The connection part is tested for temperature rise through the temperature measurement window (11) using an infrared thermometer to verify the reliability of the connection quality and electrical performance.

[0052] Example 6: Performance Comparison and Verification

[0053] Through comparative testing with traditional terminals, this invention has achieved significant improvements in several key performance indicators:

[0054] Moisture resistance test: Under the same high humidity environment conditions (relative humidity 95%, temperature 40℃), after 1000 hours of accelerated aging test, the contact resistance growth rate of this utility model is only 30% of that of traditional terminals, and the oxidation corrosion area is reduced by more than 70%.

[0055] Installation efficiency test: In a simulated on-site installation environment, the average installation time using this utility model is reduced by 40% compared to traditional terminals, and the installation error rate is reduced from 15% of that of traditional terminals to 2%.

[0056] Convenience of maintenance test: The design of the infrared temperature measurement window (11) improves the detection efficiency by 60%. Maintenance personnel can complete the temperature detection without removing the protective cover, which greatly reduces maintenance costs and safety risks.

[0057] Manufacturing cost analysis: The standardized structural design reduced manufacturing costs by 25%, mold investment by 50%, and inventory costs by 50%, resulting in significant overall economic benefits.

[0058] To verify the performance improvement mentioned above, this invention designed the following experiments:

[0059] 1. Verification of moisture-proof and oxidation-proof performance

[0060] Experimental equipment and testing devices: High and low temperature humidity test chamber (temperature range: -40℃~+150℃, humidity range: 20%~98%RH); Salt spray corrosion test chamber (compliant with GB / T 10125 standard); Micro-ohmmeter (accuracy 0.1μΩ); Digital multimeter; Electron microscope (magnification 1000×); Infrared thermal imager.

[0061] Test parameters and conditions:

[0062] Damp heat aging test: temperature 40℃±2℃, relative humidity 95%±3%, for 1000 hours;

[0063] Salt spray corrosion test: 5% NaCl solution, temperature 35℃±2℃, for 168 hours;

[0064] Temperature shock test: -40℃ to +85℃ cycle, 4 hours per cycle, for a total of 50 cycles.

[0065] Comparison scheme: Test samples: 10 new semi-enclosed terminals and 10 traditional clamp terminals; Conductive rod material: copper conductive rods of the same specifications; Test current: rated current 200A; Environmental conditions: outdoor simulated environment.

[0066] Measurement methods and evaluation criteria: Contact resistance measurement: The contact resistance between the terminal and the conductive rod is measured using a microohmmeter before and after the test; Oxidation corrosion assessment: The degree of oxidation of the contact surface is observed using an electron microscope and quantified as a percentage of area; Insulation performance test: The insulation resistance is measured, and it is required to be ≥1000MΩ; Protection level verification: Waterproof and dustproof tests are conducted according to the IP protection level standard.

[0067] 2. Installation Ease Verification

[0068] Experimental equipment and testing apparatus: simulated installation workbench; timer (accuracy 0.1 seconds); torque wrench; video recording equipment; standardized installation tool kit.

[0069] Test parameters and conditions: Installers: 10 electricians with the same skill level; Installation environment: Standardized laboratory environment and outdoor simulated environment; Conductor rod specifications: 20 sets of each of the three specifications: Φ12mm, Φ16mm, and Φ20mm; Number of repetitions: 5 installations per person for each specification, and the average value is taken.

[0070] Comparison of options:

[0071] Group A: Uses new unified terminals (universal for both incoming and outgoing lines);

[0072] Group B: Uses traditional separate terminals (incoming and outgoing lines are installed separately).

[0073] Record installation time, number of errors, and rework rate.

[0074] Measurement methods and evaluation criteria: Installation time: Total time from the start of installation to the completion of quality inspection; Error rate statistics: Record the number of errors such as incorrect orientation and incorrect specification selection; Ease of operation rating: Subjective evaluation using a 5-point scale (1 point is the worst, 5 points is the best).

[0075] 3. Maintenance and testing function verification

[0076] Experimental equipment and testing apparatus: Infrared thermal imager (temperature accuracy ±2℃); Infrared thermometer (accuracy ±1.5℃); Heat shrink tubing wrapping equipment; Standard test load; Timer

[0077] Test parameters and conditions: Test environment: room temperature 25℃, relative humidity 60%; Test current: four levels: 50A, 100A, 150A, 200A; Test distance: three distances: 0.5m, 1.0m, 1.5m; Temperature measurement window specifications: 10mm×15mm oval opening.

[0078] Comparison of options:

[0079] Group A: The new type of terminal retains the temperature measurement window after being covered with heat shrink tubing;

[0080] Group B: Traditional terminals are fully covered (no temperature measurement window);

[0081] Group C: Traditional terminals have no covering.

[0082] Measurement methods and evaluation criteria: Detection efficiency: time required for a single test and detection accuracy; Temperature measurement accuracy: error range ±3℃ compared with contact thermometers; Visibility evaluation: feasibility of detection under different ambient light conditions.

[0083] 4. Manufacturing cost-effectiveness verification

[0084] Verification method: Verification is carried out by combining theoretical analysis with actual production data.

[0085] Cost analysis parameters: Mold cost: number and manufacturing cost of molds with unified design vs. separate design; Material utilization rate: comparison of material waste between symmetrical design and asymmetrical design; Production process: comparison of production efficiency between standardization and customization; Inventory cost: inventory management cost of single SKU vs. multiple SKU.

[0086] Comparison benchmark: Annual output: 100,000 terminals; Traditional solution: 50,000 incoming terminals and 50,000 outgoing terminals; New solution: 100,000 unified terminals.

[0087] 5. Connection reliability verification

[0088] Experimental equipment and testing devices: vibration test bench (frequency range 5-2000Hz); mechanical tensile testing machine (maximum load 50kN); temperature rise testing device; contact resistance tester.

[0089] Test parameters and conditions: Vibration test: according to GB / T 2423.10 standard, frequency 10-55Hz, displacement amplitude 0.35mm, continuous for 2 hours; Mechanical strength test: apply axial tensile force to twice the rated load; Temperature rise test: continuous operation for 8 hours under rated current.

[0090] Comparison schemes: novel semi-enclosed clamping vs. traditional point contact; mating surface vs. planar contact; 20 test samples for each.

[0091] Measurement methods and evaluation criteria: Contact area measurement: The actual contact area is measured using pressure-sensitive paper; Contact resistance stability: The resistance change rate before and after vibration is ≤5%; Mechanical strength: No loosening, no deformation, and no damage.

[0092] 6. Verification Results

[0093] Results of moisture-proof and oxidation-proof performance:

[0094] Quantitative comparison:

[0095] The contact resistance growth rate of the new terminal is ≤15% (after 1000 hours of damp heat aging).

[0096] Traditional terminal contact resistance growth rate: ≥50% (under the same conditions);

[0097] Performance improvement: (50%-15%) / 50% = 70%.

[0098] This proves that the moisture barrier formed by the semi-enclosed clamp structure effectively reduces the path of moisture intrusion, and the synergistic effect of the dual protection system significantly improves the protective effect.

[0099] Ease of installation result:

[0100] Quantitative comparison:

[0101] Average installation time for the new terminal: 12 minutes / piece;

[0102] Average installation time for traditional terminals: 20 minutes / piece;

[0103] Installation efficiency improved by: (20-12) / 20 = 40%;

[0104] Error rate decreased from 15% to 2%, a reduction of (15%-2%) / 15% = 87%.

[0105] This proves that a unified design eliminates the need to distinguish between incoming and outgoing lines, a symmetrical structure eliminates directional requirements, and standardized interfaces simplify the installation process.

[0106] Maintenance and testing results:

[0107] Quantitative comparison:

[0108] New terminal detection time: 30 seconds / point;

[0109] Traditional wrapped terminal inspection time: unable to be inspected or requires removal of the wrapping (300 seconds / point);

[0110] Detection efficiency improvement: (300-30) / 300 = 90%.

[0111] Manufacturing cost results:

[0112] Quantitative comparison:

[0113] Mold cost reduction: 50% (from 2 sets of molds to 1 set);

[0114] Simplified production process: 20% efficiency improvement;

[0115] Inventory management costs: 50% reduction;

[0116] Overall manufacturing costs reduced by 25%.

[0117] Connection reliability results:

[0118] Quantitative comparison:

[0119] Increased contact area: 150% (curved fit vs. point contact);

[0120] Contact resistance decreased by 30%;

[0121] Resistance stability after vibration test: rate of change ≤3%.

[0122] 7. Results Analysis and Conclusions

[0123] Based on the above experiment, the comparison results are as follows:

[0124]

[0125] Conclusion: The pole-mounted circuit breaker's input and output terminals, through a central semi-enclosed clamp design, have achieved significant technological advancements in terms of moisture and oxidation prevention, ease of installation, maintenance and testing, cost control, and connection reliability. Verification results fully demonstrate the authenticity and effectiveness of the claimed technical effects. This technical solution possesses clear technical advantages and broad application prospects.

[0126] In the description of this utility model, it should be understood that the terms "center", "edge", "inner side", "outer side", "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0127] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the protection scope of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A pole-mounted circuit breaker line post terminal, comprising: The utility model relates to a terminal plate (1) and a semi-enclosed clamp (2) arranged at the center of the terminal plate (1), wherein the semi-enclosed clamp (2) has a semi-enclosed ring structure with a gap (3) at the opening; a conductive rod connecting part (4) is arranged inside the semi-enclosed clamp (2) to form a semi-enclosed clamping connection with a conductive rod (5); a clamping device (6) is arranged on the semi-enclosed clamp (2) to adjust the clamping force on the conductive rod (5); the semi-enclosed clamp (2) and the conductive rod (5) form a semi-enclosed clamping state, and the outer contour of the terminal plate (1) is suitable for heat shrink tube covering. The inner surface of the semi-enclosed clamp (2) is a fitting surface (7) to form a multi-point contact connection with the circular cross section of the conductive rod (5). The connecting gap between the conductive rod connecting part (4) and the conductive rod (5) has a lap joint structure to reduce the contact area directly exposed to the outside world. The outer surface of the terminal plate (1) has a smooth transition design (9) to avoid damage to the heat shrink tube caused by sharp edges. The semi-enclosed clamp (2) forms a moisture-proof barrier (10) to block the intrusion of external moisture along the contact gap. The incoming and outgoing terminals have the same structure design to realize universal interchange.

2. The pole-mounted circuit breaker access terminal of claim 1, wherein, The radial protruding size of the semi-enclosed clamp (2) is smaller than that of the traditional edge clamp.

3. The pole-mounted circuit breaker access terminal of claim 1, wherein, The clamping device (6) is a bolt fastening mechanism (12) to realize the adaptive clamping of conductive rods (5) of different specifications by adjusting the bolt.

4. The pole-mounted circuit breaker access terminal of claim 1, wherein, ​ 5. The pole-mounted circuit breaker access terminal of claim 1, wherein, ​ 6. The pole-mounted circuit breaker access terminal of claim 1, wherein, ​ 7. The pole-mounted circuit breaker access terminal of claim 1, wherein, ​ 8. The pole-mounted circuit breaker access terminal of claim 1, wherein, ​

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