Cable terminal dynamic thermal stability test device for high voltage switch

Abstract

This application relates to a dynamic and thermal stability testing device for cable terminals of high-voltage switches, used to form a short-circuit circuit for the three-phase conductors of the high-voltage switch cable terminal. The device includes a conductor assembly and a three-phase short-circuit plate. The conductor assembly includes three connecting conductors. The first connecting ends of the three connecting conductors are used to correspond one-to-one with and electrically connect to the three interfaces of the three-phase conductors. When the connecting conductors are connected to the three-phase conductors, the first connecting ends are located inside the housing, and the second connecting ends, located away from the first connecting ends, are located outside the housing. The three-phase short-circuit plate has three short-circuit points, which correspond one-to-one with the second connecting ends and are electrically connected to form a short-circuit circuit. The electrical connection between the connecting conductors and the three-phase conductors can effectively simulate the actual cable insertion conditions at the three-phase conductors of the cable terminal under real-world operating conditions, improving the integrity of the test conditions for dynamic and thermal stability testing. Furthermore, since the connection points of the short-circuit circuit are located outside the housing, on-site testing and debugging do not require opening the housing, reducing the difficulty of debugging.

Description

Technical Field

[0001] This application relates to the field of high-voltage switch technology, and in particular to a dynamic and thermal stability testing device for cable terminals of high-voltage switches. Background Technology

[0002] Excellent dynamic and thermal stability is fundamental to ensuring the safe and reliable operation of power equipment. Dynamic and thermal stability testing of high-voltage switches effectively verifies the dynamic and thermal stability of the corresponding equipment, ensuring the safe and stable operation of the equipment and the power system. Currently, in commonly used power systems, dynamic and thermal stability testing of high-voltage switches typically involves pressurizing and flowing current through an overhead bushing to the cable terminal of the high-voltage switch. The three-phase conductors of the high-voltage switch cable terminal are then short-circuited using short-connecting wires and bolts to form a test circuit. However, the test circuit formed by the loose connection differs significantly from the actual shape of the cable terminal's mating section under operating conditions, making it difficult to reflect the reliability between the cable terminal contacts and the plug-in parts, resulting in inaccurate test results. Furthermore, the cleanliness of the test site is often poor, and on-site installation of the short-circuit circuit increases the risk of foreign objects entering the casing of the high-voltage switch cable terminal, affecting the test results. Therefore, it is usually chosen to complete the short-circuiting at the factory before transporting it to the test site. Because the loose connection lacks fixed support, it is prone to loosening and falling off during transportation, making it difficult to guarantee the connection's firmness and reliability. Moreover, the short-circuit part is located inside the cable terminal casing, requiring the casing to be opened during on-site commissioning and inspection, which not only repeatedly increases the workload but also easily affects the test accuracy. Summary of the Invention

[0003] Therefore, it is necessary to provide a dynamic and thermal stability test device for high-voltage switch cable terminals to address the problems of unreliable connection and difficulty in on-site debugging of high-voltage switch cable terminals.

[0004] A dynamic and thermal stability testing device for a high-voltage switch cable terminal is used to form a short-circuit circuit of the three-phase conductors of the high-voltage switch cable terminal, wherein the three-phase conductors are disposed inside the housing of the high-voltage switch cable terminal, and the dynamic and thermal stability testing device for the high-voltage switch cable terminal includes:

[0005] A conductor assembly includes three connecting conductors, each of which has a straight structure. The two ends of the straight structure are respectively provided with a first connecting end and a second connecting end. The first connecting ends of the three connecting conductors are used to correspond one-to-one with and electrically connect the three interfaces of the three-phase conductors. When the connecting conductors are connected to the three-phase conductors, the first connecting end is located inside the housing, and the second connecting end is located outside the housing.

[0006] The three-phase shorting board has a shorting plane with three shorting points. The shorting points correspond one-to-one with the second connection terminals of the three connecting conductors and are electrically connected to form a shorting circuit.

[0007] In one embodiment, the dynamic and thermal stability test device for the cable terminal of the high-voltage switch further includes a support assembly, which includes a first support member, a second support member, and a first fixing member. The first support member is disposed and installed on the connecting conductor, and the second support member is disposed and installed on the housing of the high-voltage switch cable terminal. The first support member is connected to the second support member through the first fixing member.

[0008] In one embodiment, the first support member includes a support flange, and the second support member includes a terminal flange. The support flange is disposed at the end of the connecting conductor near the second connecting end, and the terminal flange is disposed at the port of the housing.

[0009] In one embodiment, the supporting flange has a first central hole at the center of its flange face and a first mounting hole circumferentially around the first central hole; the terminal flange has a second central hole at the center of its flange face and a second mounting hole circumferentially around the second central hole; the supporting flange is sleeved onto the connecting conductor through the first central hole; the connecting conductor passes through the terminal flange through the second central hole; the first fastener passes through both the first mounting hole and the second mounting hole and fixes both the first mounting hole and the second mounting hole.

[0010] In one embodiment, the support assembly further includes an insulation assembly, through which the support flange, the terminal flange, and the first fastener are isolated from each other.

[0011] In one embodiment, the insulating assembly includes an insulating plate, an insulating tube, and an insulating gasket. The insulating plate is disposed between the flange face of the supporting flange and the flange face of the terminal flange. The insulating tube is sleeved over the portion of the first fixing member that passes through the first mounting hole and the second mounting hole. The insulating gasket is disposed between the first fixing member and the end face of the first mounting hole and / or the end face of the second mounting hole.

[0012] In one embodiment, at least one of the following is also included:

[0013] The connection between the supporting flange and the connecting conductor is an integral connection.

[0014] The terminal flange and the housing are connected as a single unit.

[0015] In one embodiment, the conductor assembly further includes a contact seat, one end of which is connected to the first connection end of the connecting conductor, and the other end of which is used to connect to the interface of the three-phase conductor.

[0016] In one embodiment, the conductor assembly further includes a second fixing member, a third mounting hole is provided on the end face of the second connecting end of the connecting conductor, a fourth mounting hole is provided at the shorting point, and the second fixing member passes through both the third mounting hole and the fourth mounting hole to fix the third mounting hole and the fourth mounting hole.

[0017] In one embodiment, the three shorting points are arranged in an equilateral triangle, the central axes of the three connecting conductors are parallel to each other and arranged in an equilateral triangle, and the second connecting ends of the three connecting conductors correspond one-to-one with the shorting points.

[0018] In this application, the dynamic and thermal stability test device for the cable terminal of a high-voltage switchgear includes a conductor assembly and a three-phase shorting plate. The conductor assembly includes three connecting conductors with a straight structure. The first connecting ends of the three connecting conductors are connected one-to-one to the three-phase conductors of the high-voltage switchgear cable terminal. The first connecting ends are located inside the housing, and the second connecting ends are connected one-to-one to the shorting points on the three-phase shorting plate, thereby forming a shorting circuit for the dynamic and thermal stability test. The second connecting ends are located outside the housing. Setting the connecting conductors to the three-phase conductors can effectively simulate the actual cable insertion conditions at the three-phase conductors of the cable terminal, improve the completeness of the test conditions for the dynamic and thermal stability test, and thus improve the accuracy of the test results. The second connecting ends are connected to the three-phase shorting plate to form a shorting circuit. The connection point of the shorting circuit is located outside the housing, so that the housing does not need to be opened when debugging and checking the shorting circuit during the field test, effectively reducing the difficulty of field debugging. Attached Figure Description

[0019] Figure 1 This is a first-view schematic diagram of the installation structure of the cable terminal dynamic and thermal stability test device for high-voltage switches according to an embodiment of the present application, installed at the cable terminal of a high-voltage switch.

[0020] Figure 2 This is a second-view installation structure schematic diagram of an embodiment of the dynamic and thermal stability test device for cable terminals of high-voltage switches according to this application.

[0021] Figure 3 This is a schematic diagram of the conductor assembly of an embodiment of the dynamic and thermal stability test device for cable terminals of high-voltage switches according to this application.

[0022] Figure 4This is a schematic diagram of the structure of a high-voltage switch cable terminal according to an embodiment of the dynamic and thermal stability test device for high-voltage switch cables of this application.

[0023] Figure 5 This is a schematic diagram of the insulation component of an embodiment of the dynamic and thermal stability test device for cable terminals of high-voltage switches according to this application.

[0024] Explanation of component labels in the attached diagram:

[0025] 1000. Dynamic and thermal stability test device for cable terminals of high-voltage switches; 100. Conductor assembly; 110. Connecting conductor; 111. First connection end; 112. Second connection end; 120. Contact seat; 200. Three-phase shorting plate; 210. Shorting point; 300. Support assembly; 310. First support member; 311. Support flange; 320. Second support member; 321. Terminal flange; 330. Insulation assembly; 331. Insulation plate; 332. Insulation tube; 333. Insulation pad; 2000. High-voltage switch cable terminal; 400. Three-phase conductor; 500. Housing. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1 , Figure 2 and Figure 4 , Figure 1 and Figure 2 The first and second view views of the installation structure of the cable terminal dynamic and thermal stability test device 1000 for high voltage switch of this application, installed at the cable terminal 2000 of the high voltage switch, are shown respectively. Figure 4A schematic diagram of the structure of a high-voltage switch cable terminal 2000 is shown. This application proposes a dynamic and thermal stability testing device 1000 for a high-voltage switch cable terminal, used to form a short-circuit circuit for the three-phase conductors 400 of the high-voltage switch cable terminal 2000. The three-phase conductors 400 are disposed inside the housing 500 of the high-voltage switch cable terminal 2000. The dynamic and thermal stability testing device 1000 for the high-voltage switch cable terminal includes a conductor assembly 100 and a three-phase short-circuit plate 200.

[0033] The conductor assembly 100 includes three connecting conductors 110, each with a linear structure. Each linear structure has a first connecting end 111 and a second connecting end 112 at both ends. The first connecting ends 111 of the three connecting conductors are used to electrically connect to the three interfaces of the three-phase conductor 400. When the connecting conductor 110 is connected to the three-phase conductor 400, the first connecting end 111 is located inside the housing 500, and the second connecting end 112 is located outside the housing 500. The cross-section of the connecting conductor 110 can be circular, rectangular, or other shapes, without specific limitations. The material of the connecting conductor 110 can be conductive materials such as aluminum, copper, or alloys, without specific limitations. The three-phase shorting board 200 has a shorting plane with three shorting points 210. The shorting points 210 correspond one-to-one with the second connecting ends 112 of the three connecting conductors 110 and are electrically connected to form a shorting circuit.

[0034] The dynamic and thermal stability test device 1000 for the cable terminal of the high-voltage switch includes a conductor assembly 100 and a three-phase shorting plate 200. The conductor assembly 100 includes three connecting conductors 110. The connecting conductors 110 have a straight structure and the first connecting ends 111 of the three connecting conductors 110 are connected one-to-one to the three-phase conductors 400 of the high-voltage switch cable terminal 200. The first connecting ends 111 are located inside the housing 500, and the second connecting ends 112 are respectively connected one-to-one to the shorting points 210 on the three-phase shorting plate 200, thereby forming a shorting circuit for the dynamic and thermal stability test. The second connecting ends 112 are located outside the housing 500. The connection conductor 110, connected to the three-phase conductor 400, effectively simulates the actual cable insertion conditions at the three-phase conductor 400 of the cable terminal, improving the completeness of the test conditions for dynamic and thermal stability testing and thus improving the accuracy of the test results. The second connection end 112 is connected to the three-phase shorting board 200 to form a shorting circuit. The connection point of the shorting circuit is located outside the housing 500, so that the housing 500 does not need to be opened when debugging and checking the shorting circuit during the field test, effectively reducing the difficulty of field debugging.

[0035] See Figure 2The three shorting points 210 are arranged in an equilateral triangle. The central axes of the three connecting conductors 110 are parallel to each other and arranged in an equilateral triangle. The second connecting ends 112 of the three connecting conductors 110 correspond one-to-one with the shorting points 210.

[0036] See Figure 1 and Figure 3 , Figure 3 A schematic diagram of the conductor assembly 100 of an embodiment of the dynamic and thermal stability testing device 1000 for cable terminals of high-voltage switches according to this application is shown. The dynamic and thermal stability testing device 1000 for cable terminals of high-voltage switches further includes a support assembly 300, which includes a first support member 310, a second support member 320, and a first fixing member. The first support member 310 is mounted on the connecting conductor 110, and the second support member 320 is mounted on the housing 500 of the high-voltage switch cable terminal 200. The first support member 310 is connected to the second support member 320 via the first fixing member. The support assembly 300 provides fixation and support for the conductor assembly 100 and the three-phase shorting board 200 connected to the conductor assembly 100, preventing loosening of the connection due to transportation vibration and enhancing the connection stability and test reliability of the short-circuit loop formed by the dynamic and thermal stability testing device 1000 for cable terminals of high-voltage switches.

[0037] Furthermore, the first support member 310 includes a support flange 311, which is installed at the end of the connecting conductor 110 near the second connecting end 112. The connection between the support flange 311 and the connecting conductor 110 can be a non-removable integral connection such as welding, or a detachable connection such as a threaded connection or riveting, which is not specifically limited here. For example, the connection between the support flange 311 and the connecting conductor 110 is an integral connection, and the support flange 311 and the connecting conductor 110 are connected by welding to ensure the connection strength between the support flange 311 and the connecting conductor 110, thereby improving the connection reliability of the cable terminal thermal stability test device 1000 for high-voltage switches.

[0038] The second support member 320 includes a terminal flange 321, which is used to install at the port of the housing 500. The connection between the terminal flange 321 and the housing 500 can be a non-removable integral connection such as welding, or a detachable connection such as threaded connection or riveting; no specific limitation is made here. The connection between the terminal flange 321 and the housing 500 is an integral connection, and the terminal flange 321 and the housing 500 are connected by welding to ensure the connection strength between the terminal flange 321 and the housing 500, thereby improving the connection reliability of the high-voltage switch cable terminal thermal stability test device 1000.

[0039] Specifically, the support flange 311 has a first central hole at its center and a first mounting hole circumferentially around the first central hole. The terminal flange 321 has a second central hole at its center and a second mounting hole circumferentially around the second central hole. The support flange 311 is sleeved onto the connecting conductor 110 through the first central hole, and the connecting conductor 110 passes through the terminal flange 321 through the second central hole. A first fastener passes through both the first and second mounting holes and fixes both mounting holes. The first fastener can be a bolt, pin, or other fastener, and is not specifically limited here. For example, the first fastener is a bolt.

[0040] Specifically, a plurality of first mounting holes are provided along the circumference of the first central hole, and a plurality of second mounting holes are provided along the circumference of the second central hole. The first mounting holes and the second mounting holes are connected and fixed one-to-one by a first fastener.

[0041] Further, see Figure 1 and Figure 5 , Figure 5 A schematic diagram of the insulating component 330 is shown. The support component 300 also includes the insulating component 330. The support flange 311, the terminal flange 321, and the first fixing member are isolated from each other by the insulating component 330, achieving electrical isolation between the connecting conductor 110 and the housing 500. The insulating component 330 can be made of insulating materials such as plastic and rubber, and is not specifically limited here. Specifically, the insulating component 330 includes an insulating plate 331, an insulating tube 332, and an insulating gasket 333. The insulating plate 331 is disposed between the flange face of the support flange 311 and the flange face of the terminal flange 321. The insulating tube 332 is sleeved on the portion of the first fixing member that passes through the first mounting hole and the second mounting hole. The insulating gasket 333 is disposed between the first fixing member and the end face of the first mounting hole and / or the end face of the second mounting hole.

[0042] Further, see Figure 1 The conductor assembly 100 also includes a contact seat 120. One end of the contact seat 120 is connected to the first connection end 111 of the connecting conductor 110, and the other end of the contact seat 120 is used to connect to the interface of the three-phase conductor 400. The electrical connection between the connecting conductor 110 and the three-phase conductor 400 is realized through the contact seat 120.

[0043] The electrical connection between conductor 110 and the three-phase shorting board 200 can be a detachable connection such as a threaded connection or riveting, and is not specifically limited here. For example, conductor assembly 100 also includes a second fixing member. A third mounting hole is provided on the end face of the second connecting end 112 of conductor 110, and a fourth mounting hole is provided at the shorting point 210. The second fixing member passes through both the third and fourth mounting holes and fixes them, thereby achieving a secure and reliable electrical connection between conductor 110 and the three-phase shorting board 200. The second fixing member can be a bolt, pin, or other fixing member, and is not specifically limited here. For example, the second fixing member is a bolt.

[0044] In the technical solution of this application, the dynamic and thermal stability test device 1000 for the cable terminal of the high-voltage switch includes a conductor assembly 100 and a three-phase shorting plate 200. The conductor assembly 100 includes three connecting conductors 110. The connecting conductors 110 have a straight structure and the first connecting ends 111 of the three connecting conductors 110 are connected one-to-one to the three-phase conductors 400 of the high-voltage switch cable terminal 2000. The first connecting ends 111 are located inside the housing 500, and the second connecting ends 112 are respectively connected one-to-one to the shorting points 210 on the three-phase shorting plate 200, thereby forming a shorting circuit for the dynamic and thermal stability test. The second connecting ends 112 are located outside the housing 500. The connection conductor 110, connected to the three-phase conductor 400, effectively simulates the actual cable insertion conditions at the three-phase conductor 400 of the cable terminal, improving the completeness of the test conditions for dynamic and thermal stability testing and thus improving the accuracy of the test results. The second connection end 112 is connected to the three-phase shorting board 200 to form a shorting circuit. The connection point of the shorting circuit is located outside the housing 500, so that the housing 500 does not need to be opened when debugging and checking the shorting circuit during the field test, effectively reducing the difficulty of field debugging.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A dynamic and thermal stability testing device for a high-voltage switch cable terminal, used to form a short-circuit circuit of the three-phase conductors of the high-voltage switch cable terminal, wherein the three-phase conductors are disposed inside the housing of the high-voltage switch cable terminal, characterized in that, The cable terminal dynamic and thermal stability test device for the high-voltage switch includes: A conductor assembly includes three connecting conductors, each of which has a straight structure. The two ends of the straight structure are respectively provided with a first connecting end and a second connecting end. The first connecting ends of the three connecting conductors are used to correspond one-to-one with and electrically connect the three interfaces of the three-phase conductors. When the connecting conductors are connected to the three-phase conductors, the first connecting end is located inside the housing, and the second connecting end is located outside the housing. The three-phase shorting board has a shorting plane with three shorting points. The shorting points correspond one-to-one with the second connection terminals of the three connecting conductors and are electrically connected to form a shorting circuit. The dynamic and thermal stability test device for the cable terminal of the high-voltage switch also includes a support assembly. The support assembly includes a first support member, a second support member, and a first fixing member. The first support member is installed on the connecting conductor, and the second support member is installed on the housing of the high-voltage switch cable terminal. The first support member is connected to the second support member through the first fixing member. The first support member includes a support flange, and the second support member includes a terminal flange. The support flange is disposed and installed at the end of the connecting conductor near the second connecting end, and the terminal flange is disposed and installed at the port of the housing. The support assembly further includes an insulation assembly, through which the support flange, the terminal flange, and the first fastener are isolated from each other.

2. The dynamic and thermal stability test device for cable terminals of high-voltage switches according to claim 1, characterized in that, The supporting flange has a first central hole at the center of its flange face and a first mounting hole around the first central hole in the circumferential direction. The terminal flange has a second central hole at the center of its flange face and a second mounting hole around the second central hole in the circumferential direction. The supporting flange is sleeved onto the connecting conductor through the first central hole, and the connecting conductor passes through the terminal flange through the second central hole. The first fastener passes through both the first mounting hole and the second mounting hole and fixes the first mounting hole and the second mounting hole.

3. The dynamic and thermal stability test device for cable terminals of high-voltage switches according to claim 2, characterized in that, The insulating assembly includes an insulating plate, an insulating tube, and an insulating gasket. The insulating plate is disposed between the flange face of the supporting flange and the flange face of the terminal flange. The insulating tube is sleeved on the portion of the first fixing member that passes through the first mounting hole and the second mounting hole. The insulating gasket is disposed between the first fixing member and the end face of the first mounting hole and / or the end face of the second mounting hole.

4. The dynamic and thermal stability test device for cable terminals of high-voltage switches according to claim 1, characterized in that, It also includes at least one of the following: The connection between the supporting flange and the connecting conductor is an integral connection. The terminal flange and the housing are connected as a single unit.

5. The dynamic and thermal stability test device for cable terminals of high-voltage switches according to claim 1, characterized in that, The conductor assembly further includes a contact seat, one end of which is connected to the first connection end of the connecting conductor, and the other end of which is used to connect to the interface of the three-phase conductor.

6. The dynamic and thermal stability test device for cable terminals of high-voltage switches according to claim 1, characterized in that, The conductor assembly further includes a second fixing member. The end face of the second connecting end of the connecting conductor is provided with a third mounting hole, and the shorting point is provided with a fourth mounting hole. The second fixing member passes through both the third mounting hole and the fourth mounting hole and fixes the third mounting hole and the fourth mounting hole.

7. The dynamic and thermal stability test device for cable terminals of high-voltage switches according to claim 1, characterized in that, The three shorting points are arranged in an equilateral triangle, the central axes of the three connecting conductors are parallel to each other and arranged in an equilateral triangle, and the second connecting ends of the three connecting conductors correspond one-to-one with the shorting points.

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