Switchgear test terminal

Abstract

The application relates to the technical field of connecting joints, and in particular provides a switch cabinet test terminal which comprises a connector body, a terminal connecting body and a plastic deformation structure, the connector body is internally provided with a first conductor, the terminal connecting body is internally provided with a second conductor, the outer surface of the terminal connecting body is provided with a radial protruding part, a plastic deformation cavity is formed in the radial protruding part, the plastic deformation structure comprises a plastic deformation space between the radial protruding part and the first conductor, the terminal connecting body is provided with a conical cavity which forms a locking connection relationship with the connector body and makes the first conductor and the second conductor abut and conduct electricity, the plastic deformation structure further comprises a spring which is compressed in the plastic deformation space, an axial thrust pushes an axial variable combination, drives the terminal connecting body to retreat along the axial direction, at the same time, the spring releases the stored energy, accelerates the retreat movement of the terminal connecting body, the second conductor retreats along with the terminal connecting body, and is separated from the first conductor, and automatic power-off protection is completed.

Description

Technical Field

[0001] This invention relates to the field of connection connector technology, and in particular to a switchgear test terminal. Background Technology

[0002] As a critical node device in the power system, the insulation performance of switchgear directly affects the safety of the power grid. Insulation strength must be verified through partial discharge tests and power frequency withstand voltage tests during manufacturing and maintenance. The switchgear test terminal is the core conversion component for connecting test circuits and must simultaneously meet the following requirements: high insulation strength (>10kV / mm), low partial discharge (<5pC), reliable repeated insertion and removal, and physical compatibility with the internal conical interface of the switchgear. The switchgear test terminal consists of a connector body on the switchgear and a terminal connector (which can be understood as a connection joint) used with the connector body. During use, one end of the switchgear test terminal is connected to the connector body, and the other end is connected to the terminal equipment.

[0003] Existing switchgear test terminals use a tapered sleeve structure for connection, which presents the following problems in actual use: High temperatures generated by certain factors during conduction can soften and crack the outer shell or plastic or rubber insulation layer of the switchgear test terminal, causing it to lose its insulation performance and leading to a short circuit risk. Annealing softening of metal conductors: Under sustained high temperatures, the mechanical strength of copper / aluminum conductors decreases, reducing contact pressure and further exacerbating temperature rise, creating a vicious cycle. Fire hazard: Temperatures exceeding the ignition point of flammable materials (such as cable sheaths and peripheral equipment) will cause a fire. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a switchgear test terminal, comprising a connector body, a terminal connector, and a plastic deformation structure. The connector body contains a first conductor, and the terminal connector contains a second conductor. The outer surface of the terminal connector has a radial protrusion, and the radial protrusion contains a plastic deformation cavity. The plastic deformation structure includes a plastic deformation space between the radial protrusion and the first conductor. The terminal connector has a conical cavity that forms a locking connection with the connector body and allows the first and second conductors to conduct electricity. The connector body has a conical portion that forms a locking connection with the conical cavity. The plastic deformation structure also includes a spring compressed within the plastic deformation space. An axial variable assembly is formed at one end of the radial protrusion facing the plastic deformation space. One end of the spring abuts against the axial variable assembly, and the other end of the spring abuts against the first conductor.

[0005] As a further preferred embodiment, the axial variable assembly consists of an annular variable cavity formed on the radial protrusion and a plastic baffle covering the outer end of the annular variable cavity. One end of the spring abuts against the axial variable assembly and contacts the plastic baffle. After the plastic baffle breaks, the contact end between the spring and the plastic baffle enters the annular variable cavity.

[0006] As a further preferred embodiment, a variable channel is provided between the plastic deformation cavity and the plastic deformation space, and the variable channel is inclined towards the direction of the first conductor.

[0007] As a further preferred embodiment, the end of the plastic deformation cavity away from the variable channel is provided with an expansion section whose volume gradually increases, and the end of the plastic deformation cavity close to the variable channel is provided with a shrinking contraction section whose volume gradually decreases in the direction of the variable channel. The total volume of the plastic deformation cavity is greater than the volume of the plastic deformation space.

[0008] As a further preferred embodiment, the tail end of the expansion section is provided with a concave area, and the terminal connector is provided with an extension that gradually moves away from the radial protrusion. A second through hole is opened on the extension, the second conductor is fixed in the second through hole, and a heat-conducting copper ring is fixed on the second conductor. The outer wall of the heat-conducting copper ring is attached to the hole wall of the second through hole, and the heat generated when the second conductor conducts electricity is collected in the concave area through the heat-conducting copper ring.

[0009] As a further preferred embodiment, the plastic deformation structure also includes a plastic deformation groove formed on the radial protrusion, the plastic deformation groove being inclined toward the direction of the variable channel and close to the plastic deformation cavity.

[0010] As a further preferred embodiment, the connector body has a first through hole, the first conductor fills and locks in the first through hole, and the two ends of the first conductor reach the two ends of the first through hole and are fixed.

[0011] As a further preferred embodiment, the first conductor has a quick-connect hole, one end of the second conductor has a first connection end that extends into the quick-connect hole and forms a conductive connection with the first conductor, and the other end of the second conductor has a second connection end that passes through the extension of the terminal connector for connection to the switch cabinet test terminal.

[0012] As a further preferred embodiment, the extension of the terminal connector is fitted with two insulating sleeves, one of which has its end reaching the end of the extension.

[0013] The advantages of this invention compared to the prior art are:

[0014] A radial protrusion is provided on the terminal connector, within which a plastic deformation cavity is formed. This cavity is filled with a solid thermal expansion material, such as a paraffin-based composite. The preload force after the first conductor of the connector body connects to the second conductor on the terminal connector is much greater than the spring's restoring force, indicating normal operation. If, due to some factor, the electrical conductivity between the first and second conductors increases and reaches the trigger stage, heat is conducted to the plastic deformation cavity. The thermal expansion material undergoes a phase change due to heat, resulting in solid-liquid or solid-solid expansion and volume expansion. This expansion applies an axial thrust to the axial variable combination, causing the terminal connector to retract axially. Simultaneously, the spring releases its stored energy, accelerating the retraction of the terminal connector. The second conductor retracts with the terminal connector and separates from the first conductor, automatically completing the power-off protection. In the event of a sudden high temperature, the thermal expansion material directly contacts the heat source, resulting in a short conduction path, short trigger time, and high efficiency. No external power or control signal is required; it is a purely mechanical action. It cuts off the circuit before the temperature rise causes a fire, with a fast response speed; the safety mechanism is integrated inside the connector, without increasing the installation volume, and the structure is compact; no additional circuit components are required, such as no internal fuse is needed, and the size and appearance are not affected; it is suitable for various connector types such as plugs, terminal blocks, and busbar trunking, and has good compatibility. Attached Figure Description

[0015] Figure 1 A schematic diagram of a switchgear test terminal provided for an embodiment of the present invention from a three-dimensional perspective;

[0016] Figure 2 A schematic diagram of the right end of the switchgear test terminal provided for an embodiment of the present invention;

[0017] Figure 3 The switchgear test terminal provided for the embodiments of the present invention consists of Figure 2 A schematic diagram of section A after it has been cut open;

[0018] Figure 4 A schematic diagram of the switchgear test terminal after it has been cut open, according to an embodiment of the present invention, from a three-dimensional perspective.

[0019] Figure 5 The switchgear test terminal provided for the embodiments of the present invention consists of Figure 4 Enlarged schematic diagram of section B;

[0020] Figure 6 This is a partial schematic diagram of the switchgear test terminal provided in an embodiment of the present invention, showing the connector body and terminal connector after disassembly.

[0021] In the figure: 1. Connector body; 101. Tapered part; 102. First through hole; 2. Terminal connector; 201. Tapered cavity; 202. Radial protrusion; 2021. Axial variable combination; 20211. Annular variable cavity; 20212. Plastic baffle; 2301. Expansion part; 2302. Shrinkage part; 2303. Concave area; 203. Plastic deformation cavity; 204. Second through hole; 205. Extension part; 3. First conductor; 301. Quick docking hole; 4. Second conductor; 401. First connection end; 402. Second connection end; 5. Plastic deformation structure; 501. Plastic deformation space; 503. Spring; 504. Variable through groove; 505. Plastic deformation groove; 6. Insulating sleeve; 7. Thermally conductive copper ring. Detailed Implementation

[0022] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] In one implementation, such as Figures 1-6 As shown:

[0024] This embodiment provides a switchgear test terminal, including a connector body 1, a terminal connector 2, and a plastic deformation structure 5. The connector body 1 has a first conductor 3 inside, and the terminal connector 2 has a second conductor 4 inside. The outer side of the terminal connector 2 has a radial protrusion 202, and a plastic deformation cavity 203 is formed inside the radial protrusion 202. The plastic deformation structure 5 includes a plastic deformation space 501 between the radial protrusion 202 and the first conductor 3. The terminal connector 2 has a conical cavity 201 that forms a locking connection with the connector body 1 and connects the first conductor 3 and the second conductor 4 for conduction. The connector body 1 has a conical part 101 that forms a locking connection with the conical cavity 201. The plastic deformation structure 5 also includes a spring 503 compressed in the plastic deformation space 501. An axial variable combination 2021 is formed at one end of the radial protrusion 202 facing the plastic deformation space 501. One end of the spring 503 abuts against the axial variable combination 2021, and the other end of the spring 503 abuts against the first conductor 3.

[0025] When the terminal connector 2 is inserted into the connector body 1, the conical cavity 201 and the conical part 101 are interlocked by the inclined plane between them, generating an axial preload force. This forces the first conductor 3 and the second conductor 4 into close contact, forming a low-resistance conductive path. The plastic deformation cavity 203 is filled with a solid thermal expansion material, such as a paraffin-based composite, whose initial volume is small and smaller than the cavity volume. The spring 503 is in a compressed state, but because the preload force after the connection between the first conductor 3 and the second conductor 4 is much greater than the restoring force of the spring 503, the connection structure remains stable and is in normal use. Due to certain factors, the electrical conductivity between the first conductor 3 and the second conductor 4 increases, reaching the trigger stage. Heat is conducted through the second conductor 4 → terminal connector 2 → radial protrusion 202 to the plastic deformation cavity 203. The thermally expanding material undergoes a phase change due to heat, expanding in both solid-liquid and solid-solid states. Simultaneously, the expanding material is squeezed into the plastic deformation space 501 and applies an axial thrust to the axial variable assembly 2021. The direction of this axial thrust is opposite to the pre-tightening force between the first conductor 3 and the second conductor 4. After the expansion thrust is released through the spring 503, it pushes the axial variable assembly 2021, causing the terminal connector 2 to move backward axially. At the same time, the spring 503 releases its stored energy, accelerating the backward movement of the terminal connector 2. The second conductor 4 moves backward with the terminal connector 2 and separates from the first conductor 3, automatically completing the power-off protection and preventing fire.

[0026] In summary, the connection between terminal connector 2 and connector body 1 offers a rapid response in the event of a sudden high temperature. The thermal expansion material directly contacts the heat source, resulting in a short conduction path, short trigger time, and high efficiency. It is passively safe, requiring no external power or control signals, operating purely mechanically. It cuts off the circuit before a fire is ignited by the temperature rise, providing a quick response. The safety mechanism is integrated inside the connector, without increasing the installation size. The compact structure eliminates the need for additional circuit components, such as internal fuses, and does not affect the overall size or appearance. It is compatible with various connector types, including plugs, terminal blocks, and busbar trunking.

[0027] like Figure 4 , Figure 5 As shown, in another embodiment, the axial variable assembly 2021 consists of an annular variable cavity 20211 formed on the radial protrusion 202 and a plastic baffle 20212 covering the outer end of the annular variable cavity 20211. One end of the spring 503 abuts against the axial variable assembly 2021 and contacts the plastic baffle 20212. After the plastic baffle 20212 breaks, the contacting end of the spring 503 and the plastic baffle 20212 enters into the annular variable cavity 20211.

[0028] For example, when the expansion force is released from the plastic deformation cavity 203 to the plastic deformation space 501, and the axial variable assembly 2021 is pushed by the release length of the spring 503, the plastic baffle 20212 is pushed by the contact end of the spring 503. After the plastic baffle 20212 undergoes plastic deformation or breaks, it is quickly pushed into the annular variable cavity 20211. The annular variable cavity 20211 provides the spring 503 with a restoring length of movable space, thereby allowing the plastic baffle 20212 to travel around the annular variable cavity 20211. In this manner, the plastic baffle 20212 is pushed into the annular variable cavity 20211. The inertial thrust provided by the spring 503, combined with the ejection action of the spring 503, forces the plastic baffle 20212 into the annular variable cavity 20211. This provides an impact force to the root of the annular variable cavity 20211, amplifying the pushing force to accelerate and more effectively make the terminal connector 2 move in the opposite direction to the connection direction with the connector body 1. Finally, the terminal connector 2 drives the second conductor 4 and the first conductor 3 to effectively separate and complete the effective power disconnection.

[0029] like Figure 5 As shown, a variable channel 504 is provided between the plastic deformation cavity 203 and the plastic deformation space 501, and the variable channel 504 is inclined towards the first conductor 3. When the thermally expanding material expands, in addition to providing a thrust to the plastic deformation cavity 203 opposite to that during connection, some of the expanded material will also enter the plastic deformation space 501 through the variable channel 504. At the moment of expansion, the booster spring 503 releases its length, increasing the pushing force, shortening the separation time between the second conductor 4 and the first conductor 3, improving the power-off efficiency, and reducing safety hazards.

[0030] like Figure 5 As shown, the plastic deformation cavity 203 has an expansion section 2301 with gradually increasing volume at the end away from the variable channel 504, and a shrinking section 2302 with gradually decreasing volume in the direction of the variable channel 504 at the end of the plastic deformation cavity 203 close to the variable channel 504. The total volume of the plastic deformation cavity 203 is greater than the volume of the plastic deformation space 501. The thermally expanding material is filled from the expansion section 2301 into the shrinking and contracting section 2302. When the thermally expanding material is heated and expands in the plastic deformation cavity 203, the heat is released from the expansion section 2301 and the shrinking and contracting section 2302. Since the amount of thermally expanding material in the expansion section 2301 is greater than the amount in the shrinking and contracting section 2302, the expanded material will accelerate from the expansion section 2301 to the shrinking and contracting section 2302 and eventually be released into the plastic deformation space 501. In a short time, the spring 503 pushes the plastic baffle 20212, and the thrust acting on the plastic baffle 20212 increases in a short time, forcing the plastic baffle 20212 to be quickly pushed into the annular variable cavity 20211, further shortening the separation time of the second conductor 4 and the first conductor 3, further improving the power-off efficiency, and further reducing safety hazards.

[0031] like Figure 3 , Figure 5 As shown, the tail end of the expansion part 2301 is provided with a concave area 2303, and the terminal connector 2 is provided with an extension part 205 that gradually moves away from the radial protrusion part 202. A second through hole 204 is provided on the extension part 205. The second conductor 4 is fixed in the second through hole 204. A heat-conducting copper ring 7 is fixed on the second conductor 4. The outer wall surface of the heat-conducting copper ring 7 is attached to the hole wall of the second through hole 204, and the heat generated when the second conductor 4 conducts electricity is collected in the concave area 2303 through the heat-conducting copper ring 7. The second conductor 4 transfers heat to the heat-conducting copper ring 7. The heat-conducting copper ring 7 uses its thermal conductivity to release heat to the radial protrusion 202. In particular, the heat is concentrated and rapidly released from the radial protrusion 202 to the concave area 2303, causing the thermally expanding material in the plastic deformation cavity 203 to reach its expansion point in a short time. The heat generated by the part of the second conductor 4 connected to the radial protrusion 202 is also released to the radial protrusion 202. In particular, the setting of the spring 503 not only increases the thrust by releasing the length, but also uses the spiral thermal conductivity of the spring 503 to improve the thermal conductivity speed, which further accelerates the expansion speed of the thermally expanding material.

[0032] The plastic deformation structure 5 also includes a plastic deformation groove 505 formed on the radial protrusion 202. The plastic deformation groove 505 is inclined towards the variable channel 504 and close to the plastic deformation cavity 203. When the thermally expanding material expands in the plastic deformation cavity 203, the expansion force, in addition to entering the plastic deformation space 501, is also released to the plastic deformation groove 505 through the outer surface of the plastic deformation cavity 203. This causes the plastic deformation groove 505 to narrow from the root to the outer end, providing a plastic deformation amount to the radial protrusion 202 and preventing the radial protrusion 202 from bursting.

[0033] The connector body 1 has a first through hole 102. The first conductor 3 fills and locks in the first through hole 102. The two ends of the first conductor 3 reach the two ends of the first through hole 102 and are fixed.

[0034] The first conductor 3 has a quick-connect hole 301. One end of the second conductor 4 has a first connection end 401 that extends into the quick-connect hole 301 and forms an electrical connection with the first conductor 3. The other end of the second conductor 4 passes through the extension 205 of the terminal connector 2 and has a second connection end 402 for connecting to the switch cabinet test terminal.

[0035] Two insulating sleeves 6 are fitted on the extension 205 of the terminal connector 2, with the end of one of the insulating sleeves 6 reaching the end of the extension 205.

[0036] Further details are needed regarding the technical requirements for the switchgear test terminal: 1. The surface should be flat and clean, free from defects such as dark spots, dark lines, and mechanical damage. 2. The interior should be free from defects such as shrinkage cavities, air holes, cracks, and stress concentrations. 3. The sealing surface should be flat, smooth, and free from defects such as scratches, cracks, and burrs that affect sealing. 4. Dimensional tolerances not specified shall conform to GB1804-C.

[0037] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0038] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switchgear test terminal, characterized in that, The connector includes a connector body (1), a terminal connector (2), and a plastic deformation structure (5). The connector body (1) contains a first conductor (3), and the terminal connector (2) contains a second conductor (4). The terminal connector (2) has a radial protrusion (202) on its outer side, and a plastic deformation cavity (203) is formed inside the radial protrusion (202). The plastic deformation structure (5) includes a plastic deformation space (501) between the radial protrusion (202) and the first conductor (3). The terminal connector (2) has a conical cavity (201) that forms a locking connection with the connector body (1) and allows the first conductor (3) and the second conductor (4) to conduct electricity. (1) A tapered part (101) is provided to form a locking connection with the tapered cavity (201). The plastic deformation structure (5) also includes a spring (503) compressed in the plastic deformation space (501). An axial variable assembly (2021) is provided at one end of the radial protrusion (202) facing the plastic deformation space (501). One end of the spring (503) abuts against the axial variable assembly (2021), and the other end of the spring (503) abuts against the first conductor (3). The plastic deformation cavity is filled with a solid thermal expansion material. When the thermal expansion material is heated, it expands in volume and applies an axial thrust to the axial variable assembly (2021) to drive the second conductor (4) to separate from the first conductor (3).

2. The switchgear test terminal according to claim 1, characterized in that, The axial variable assembly (2021) consists of an annular variable cavity (20211) opened on the radial protrusion (202) and a plastic baffle (20212) covering the outer end of the annular variable cavity (20211). One end of the spring (503) abuts against the axial variable assembly (2021) and contacts the plastic baffle (20212). After the plastic baffle (20212) breaks, the contacting end of the spring (503) and the plastic baffle (20212) enters the annular variable cavity (20211).

3. The switchgear test terminal according to claim 2, characterized in that, A variable channel (504) is provided between the plastic deformation cavity (203) and the plastic deformation space (501), and the variable channel (504) is inclined toward the first conductor (3).

4. The switchgear test terminal according to claim 3, characterized in that, The plastic deformation cavity (203) is provided with an expansion section (2301) whose volume gradually increases at the end away from the variable channel (504), and a shrinking section (2302) whose volume gradually decreases in the direction of the variable channel (504) at the end of the plastic deformation cavity (203) close to the variable channel (504). The total volume of the plastic deformation cavity (203) is greater than the volume of the plastic deformation space (501).

5. The switchgear test terminal according to claim 4, characterized in that, The tail end of the expansion part (2301) is provided with a concave area (2303), and the terminal connector (2) is provided with an extension part (205) that gradually moves away from the radial protrusion part (202). A second through hole (204) is opened on the extension part (205). The second conductor (4) is fixed in the second through hole (204). A heat-conducting copper ring (7) is fixed on the second conductor (4). The outer wall of the heat-conducting copper ring (7) is attached to the hole wall of the second through hole (204), and the heat generated when the second conductor (4) conducts electricity is collected in the concave area (2303) through the heat-conducting copper ring (7).

6. The switchgear test terminal according to claim 5, characterized in that, The plastic deformation structure (5) also includes a plastic deformation groove (505) opened on the radial protrusion (202), the plastic deformation groove (505) is inclined toward the variable through groove (504) and close to the plastic deformation cavity (203).

7. The switchgear test terminal according to claim 6, characterized in that, The connector body (1) has a first through hole (102), the first conductor (3) fills and locks in the first through hole (102), and the two ends of the first conductor (3) reach the two ends of the first through hole (102) and are fixed.

8. The switchgear test terminal according to claim 7, characterized in that, The first conductor (3) has a quick docking hole (301), and one end of the second conductor (4) has a first connection end (401) that extends into the quick docking hole (301) and forms an electrical connection with the first conductor (3). The other end of the second conductor (4) passes through the extension (205) of the terminal connector (2) and has a second connection end (402) for connecting to the switch cabinet test terminal.

9. The switchgear test terminal according to claim 8, characterized in that, Two insulating sleeves (6) are fitted on the extension (205) of the terminal connector (2), with the end of one of the insulating sleeves (6) reaching the end of the extension (205).

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