Insulation assembly for 10kV voltage transformer and installation method of insulation assembly

Abstract

The invention discloses an insulation assembly for a 10kV voltage transformer, which relates to the technical field of voltage transformers and comprises a voltage transformer and an insulation protection device. Four mounting blocks are fixedly connected to the surface of the voltage transformer, bolts are mounted in the four mounting blocks, three insulators are mounted at the top of the voltage transformer, and fourteen wiring terminals are mounted at the top of the voltage transformer; the insulation protection device comprises an insulation protection plate, two ejector rods, a pressing rod, two limiting clamping balls, two fixing clamping blocks and two springs, the insulation protection plate is slidably installed at the top of the voltage transformer, a containing groove is formed in the bottom of the insulation protection plate, and four wiring terminals on the rear side are hidden in the containing groove; the four wiring terminals for experiments on the rear side are hidden in the placement grooves, so that the wiring terminals are prevented from being exposed outside, the wiring terminals are prevented from being etched by atmospheric environment, rain, snow, wind, sand and the like, and the rusting phenomenon of the wiring terminals is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage transformers, and in particular to an insulation component for a 10kV voltage transformer and an installation method thereof. Background Art

[0002] Voltage transformers are similar to transformers and are instruments used to transform voltage. However, the purpose of transformers to transform voltage is to facilitate the transmission of electrical energy, so the capacity is very large, and is generally calculated in kilovolt-amperes or megavolt-amperes; while the purpose of voltage transformers to transform voltage is mainly to power measuring instruments and relay protection devices, to measure the voltage, power and electrical energy of the line, or to protect valuable equipment, motors and transformers in the line when a line fault occurs, so the capacity of voltage transformers is very small.

[0003] Existing outdoor voltage transformers are used in power systems and electrical equipment. During actual operation, the terminals are directly electrically connected to the high-voltage busbar, and are usually fastened with lead cables and auxiliary terminal ears and bolts. The voltage transformer is usually provided with experimental terminals, which are not used when the voltage transformer is in normal operation, so that the experimental terminals are directly exposed to the atmosphere. According to years of use and user feedback, the terminals are exposed to long-term erosion by the atmospheric environment, rain, snow, wind and sand, and are prone to rust. In severe cases, this can lead to poor electrical contact or open circuit, affecting safe power supply operation. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide an insulating component for a 10kV voltage transformer and an installation method thereof, which can solve the problem that the terminal is easily corroded by the atmospheric environment, rain, snow, wind and sand for a long time, and the terminal is easily corroded, which may cause poor electrical contact or open circuit in severe cases, affecting the safe operation of the power supply.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an insulating component for a kV voltage transformer, comprising a voltage transformer and an insulating protection device; four mounting blocks are fixedly connected to the surface of the voltage transformer, bolts are installed inside the four mounting blocks, three insulators are installed on the top of the voltage transformer, and fourteen wiring terminals are installed on the top of the voltage transformer; the insulating protection device comprises an insulating protection plate, two push rods, a pressure rod, two limit clamping balls, two fixed clamping blocks and two springs, the insulating protection plate is slidably installed on the top of the voltage transformer, a placement groove is provided at the bottom of the insulating protection plate, four wiring terminals on the rear side are hidden inside the placement groove, the two push rods are slidably connected inside the insulating protection plate, the pressure rod is fixedly connected to the rear ends of the two push rods, the two limit clamping balls are respectively fixedly connected to the front ends of the two push rods, the left and right ends of the insulating protection plate are both provided with slide grooves, the two fixed clamping blocks are respectively slidably connected inside the two slide grooves, and the opposite ends of the two fixed clamping blocks are both provided with extrusion slopes.

[0006] Preferably, the two springs are fixedly connected to the surfaces of the two fixed blocks respectively, and one end of the spring away from the fixed blocks is fixedly connected to the inner wall of the slide groove.

[0007] Preferably, the surfaces of the two fixed blocks are both provided with trapezoidal slots, and the surfaces of the two limiting balls are in contact with the inner walls of the two trapezoidal slots respectively.

[0008] Preferably, two positioning blocks are fixedly connected to the top of the voltage transformer.

[0009] Preferably, four L-shaped blocks are fixedly connected to the surface of the insulating protection plate, and the four L-shaped blocks are slidably connected to the surfaces of the two positioning blocks.

[0010] Preferably, the surfaces of the two positioning blocks are provided with positioning slots, and the opposite ends of the two fixed blocks are slidably engaged in the two positioning slots respectively.

[0011] Preferably, a method for installing an insulation assembly for a 10kV voltage transformer comprises the following steps:

[0012] S1: When the four wiring terminals on the rear side need to be used, the staff can press the two push rods to the front side through the pressure rod, and the two push rods slide to the front side and drive the two limit card balls to slide to the front side to squeeze the inner walls of the two trapezoidal card slots. At this time, the two fixed card blocks slide relatively under the squeezing effect of the two limit card balls, and the fixed card blocks slide and squeeze the spring. The spring gives a reverse elastic force to the trapezoidal card slot, and the two push rods can be limited by the two limit card balls to prevent the two push rods from moving out of the interior of the insulation protection plate. The two fixed card blocks slide relatively and move out of the interior of the two positioning card slots, thereby releasing the fixing effect on the insulation protection plate;

[0013] S2: The worker directly slides the insulation protection plate upward, and the insulation protection plate slides upward and drives the four L-shaped blocks to slide upward and detach from the surfaces of the two positioning blocks to complete the disassembly, and finally releases the protection of the four rear terminal blocks;

[0014] S3: When the staff needs to protect the four wiring terminals on the rear side, the staff picks up the insulating protection plate and slides it directly downward. The insulating protection plate slides downward and drives the four L-shaped blocks to slide downward and get stuck on the surfaces of the two positioning blocks. The insulating protection plate is limited and fixed by the four L-shaped blocks to ensure that the insulating protection plate can slide vertically downward to prevent the insulating protection plate from tilting during installation. This is not only convenient for the staff to install it, but also can fix the insulating protection plate by the four L-shaped blocks to ensure the stability of the installation of the insulating protection plate and prevent the insulating protection plate from falling off and affecting the use of the voltage transformer, thereby ensuring the normal use of the voltage transformer. The insulating protection plate slides downward and drives the two fixed blocks to slide downward to squeeze the tops of the two positioning blocks. The fixed block slides downward and squeezes the top of the positioning block through the extrusion slope, thereby causing the fixed block to slide and squeeze the spring, and the spring gives the fixed block a reverse elastic force.

[0015] S4: When the fixed card block slides to the position of the positioning card slot, the spring can release the elastic force and push the fixed card block to slide in the opposite direction and get into the inside of the positioning card slot. The insulating protection plate can be fixedly installed on the surface of the two positioning card blocks through the two positioning card slots, thereby finally completing the protection of the four wiring terminals on the rear side, making it convenient for the staff to install the insulating protection plate, thereby improving the convenience of installing the insulating protection plate. By hiding the four wiring terminals for the rear experiment inside the placement groove, the wiring terminals are prevented from being exposed to the outside, thereby preventing the wiring terminals from being corroded by the atmospheric environment, rain, snow, wind and sand, preventing the wiring terminals from rusting, and preventing the wiring terminals from causing poor electrical contact or open circuit, thereby ensuring safe power supply operation.

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

[0017] 1. The 10kV voltage transformer insulation component and the installation method thereof hide the four wiring terminals for the rear experiment in the inside of the placement groove, thereby avoiding the wiring terminals from being exposed to the outside, preventing the wiring terminals from being corroded by the atmospheric environment, rain, snow, wind and sand, etc., preventing the wiring terminals from rusting, and avoiding the wiring terminals from causing poor electrical contact or open circuit, thereby ensuring safe power supply operation.

[0018] 2. The 10kV voltage transformer insulation component and installation method thereof use four L-shaped blocks to limit and fix the insulation protection plate to ensure that the insulation protection plate can slide vertically downward to prevent the insulation protection plate from tilting during installation. This is not only convenient for workers to install it, but also can fix the insulation protection plate through the four L-shaped blocks to ensure the stability of the installation of the insulation protection plate, avoid the insulation protection plate from falling off and affecting the use of the voltage transformer, thereby ensuring the normal use of the voltage transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the overall structure of an insulation assembly for a 10kV voltage transformer and an installation method thereof according to the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the insulation protection plate of the present invention after being disassembled;

[0022] Figure 3 It is a schematic diagram of the bottom structure of the insulating protection plate of the present invention;

[0023] Figure 4 It is a surface schematic diagram of the structural insulation protection plate of the present invention;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the insulating protection plate of the present invention.

[0025] Figure numerals: 1. voltage transformer; 2. mounting block; 3. bolt; 4. insulator; 5. terminal; 6. insulation protection plate; 7. placement groove; 8. push rod; 9. pressure rod; 10. limit ball; 11. slide groove; 12. fixed block; 13. extrusion slope; 14. spring; 15. trapezoidal slot; 16. L-shaped block; 17. positioning block; 18. positioning slot. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] See also Figure 1-5 The present invention provides a technical solution: an insulating component for a 10kV voltage transformer with a limit ball, comprising a voltage transformer 1 and an insulating protection device, wherein four mounting blocks 2 are fixedly connected to the surface of the voltage transformer 1, and bolts 3 are installed inside the four mounting blocks 2. A staff member can install and fix the voltage transformer 1 by rotating the four bolts 3 with a wrench.

[0031] Three insulators 4 are installed on the top of the voltage transformer 1, and fourteen wiring terminals 5 are installed on the top of the voltage transformer 1. The insulation protection device includes an insulation protection plate 6, two top rods 8, a pressure rod 9, two limit balls 10, two fixed blocks 12 and two springs 14. The insulation protection plate 6 is slidably installed on the top of the voltage transformer 1. A placement groove 7 is opened at the bottom of the insulation protection plate 6, and the four rear wiring terminals 5 are hidden inside the placement groove 7.

[0032] The four wiring terminals 5 on the rear side are only used during experiments. When the voltage transformer 1 is in normal operation, the insulating protection plate 6 covers the top of the four wiring terminals 5 on the rear side, and the four wiring terminals 5 are hidden inside the placement groove 7, thereby preventing the wiring terminals 5 from being exposed to the outside, preventing the wiring terminals 5 from being corroded by the atmospheric environment, rain, snow, wind and sand, preventing the wiring terminals 5 from rusting, and preventing the wiring terminals 5 from causing poor electrical contact or open circuit, thereby ensuring safe power supply operation.

[0033] The two push rods 8 are slidably connected to the inside of the insulating protection plate 6, the pressure rod 9 is fixedly connected to the rear ends of the two push rods 8, the two limit balls 10 are respectively fixedly connected to the front ends of the two push rods 8, the left and right ends of the insulating protection plate 6 are provided with slide grooves 11, the two fixed blocks 12 are respectively slidably connected to the inside of the two slide grooves 11, the opposite ends of the two fixed blocks 12 are provided with extrusion inclined surfaces 13, the two springs 14 are respectively fixedly connected to the surfaces of the two fixed blocks 12, and the end of the spring 14 away from the fixed block 12 is fixedly connected to the slide groove 11 The inner wall of the two fixed blocks 12 is provided with a trapezoidal groove 15 on the surface, the surfaces of the two limit balls 10 are in contact with the inner walls of the two trapezoidal grooves 15 respectively, the top of the voltage transformer 1 is fixedly connected with two positioning blocks 17, the surface of the insulating protection plate 6 is fixedly connected with four L-shaped blocks 16, the four L-shaped blocks 16 are slidably connected to the surfaces of the two positioning blocks 17, the surfaces of the two positioning blocks 17 are provided with positioning grooves 18, and the opposite ends of the two fixed blocks 12 are slidably connected to the inside of the two positioning grooves 18 respectively.

[0034] Installation method of insulation components for 10kV voltage transformer with limit card ball:

[0035] The first step: when the four terminal blocks 5 on the rear side need to be used, the staff can press the two push rods 8 to the front side through the pressure rod 9. The two push rods 8 slide to the front side and drive the two limit balls 10 to slide to the front side to squeeze the inner walls of the two trapezoidal slots 15. At this time, the two fixed blocks 12 slide relative to each other under the squeezing effect of the two limit balls 10. The fixed blocks 12 slide and squeeze the spring 14. The spring 14 gives the trapezoidal slot 15 a reverse elastic force, and the two push rods 8 can be limited by the two limit balls 10 to prevent the two push rods 8 from moving out of the interior of the insulating protective plate 6. The two fixed blocks 12 slide relative to each other and move out of the interior of the two positioning slots 18, thereby releasing the fixing effect on the insulating protective plate 6.

[0036] Step 2: Finally, the staff directly slides the insulating protection plate 6 upward, and the insulating protection plate 6 slides upward and drives the four L-shaped blocks 16 to slide upward and detach from the surfaces of the two positioning blocks 17 to complete the disassembly, and finally release the protection of the four rear terminals 5.

[0037] The third step: when the staff needs to protect the four wiring terminals 5 on the rear side, the staff picks up the insulating protection plate 6 and slides it directly downward. The insulating protection plate 6 slides downward and drives the four L-shaped blocks 16 to slide downward and get stuck on the surfaces of the two positioning blocks 17. The insulating protection plate 6 is limited and fixed by the four L-shaped blocks 16 to ensure that the insulating protection plate 6 can slide vertically downward to prevent the insulating protection plate 6 from tilting during installation. This not only makes it convenient for the staff to install it, but also allows the insulating protection plate 6 to be fixed by the four L-shaped blocks 16 to ensure the stability of the installation of the insulating protection plate 6 and prevent the insulating protection plate 6 from falling off and affecting the use of the voltage transformer 1, thereby ensuring the normal use of the voltage transformer 1. The insulating protection plate 6 slides downward and drives the two fixed blocks 12 to slide downward to squeeze the tops of the two positioning blocks 17. The fixed block 12 slides downward and squeezes the top of the positioning block 17 through the extrusion slope 13, thereby causing the fixed block 12 to slide and squeeze the spring 14, and the spring 14 gives the fixed block 12 a reverse elastic force.

[0038] Step 4: When the fixed block 12 slides to the position of the positioning slot 18, the spring 14 can release the elastic force and push the fixed block 12 to slide in the opposite direction and get into the inside of the positioning slot 18. The insulating protection plate 6 can be fixedly installed on the surface of the two positioning blocks 17 through the two positioning slots 18, and finally the protection of the four rear terminals 5 is completed, which is convenient for the staff to install the insulating protection plate 6 and improves the convenience of installation of the insulating protection plate 6. By hiding the four rear terminals 5 for experiments in the placement groove 7, the terminals 5 are prevented from being exposed to the outside, which prevents the terminals 5 from being corroded by the atmospheric environment, rain, snow, wind and sand, and prevents the terminals 5 from rusting and causing poor electrical contact or open circuit, thereby ensuring safe power supply operation.

[0039] Working principle: The 10kV voltage transformer insulation assembly and its installation method are used:

[0040] The first step: when the four terminal blocks 5 on the rear side need to be used, the staff can press the two push rods 8 to the front side through the pressure rod 9. The two push rods 8 slide to the front side and drive the two limit balls 10 to slide to the front side to squeeze the inner walls of the two trapezoidal slots 15. At this time, the two fixed blocks 12 slide relative to each other under the squeezing effect of the two limit balls 10. The fixed blocks 12 slide and squeeze the spring 14. The spring 14 gives the trapezoidal slot 15 a reverse elastic force, and the two push rods 8 can be limited by the two limit balls 10 to prevent the two push rods 8 from moving out of the interior of the insulating protective plate 6. The two fixed blocks 12 slide relative to each other and move out of the interior of the two positioning slots 18, thereby releasing the fixing effect on the insulating protective plate 6.

[0041] Step 2: Finally, the staff directly slides the insulating protection plate 6 upward, and the insulating protection plate 6 slides upward and drives the four L-shaped blocks 16 to slide upward and detach from the surfaces of the two positioning blocks 17 to complete the disassembly, and finally release the protection of the four rear terminals 5.

[0042] The third step: when the staff needs to protect the four wiring terminals 5 on the rear side, the staff picks up the insulating protection plate 6 and slides it directly downward. The insulating protection plate 6 slides downward and drives the four L-shaped blocks 16 to slide downward and get stuck on the surfaces of the two positioning blocks 17. The insulating protection plate 6 is limited and fixed by the four L-shaped blocks 16 to ensure that the insulating protection plate 6 can slide vertically downward to prevent the insulating protection plate 6 from tilting during installation. This not only makes it convenient for the staff to install it, but also allows the insulating protection plate 6 to be fixed by the four L-shaped blocks 16 to ensure the stability of the installation of the insulating protection plate 6 and prevent the insulating protection plate 6 from falling off and affecting the use of the voltage transformer 1, thereby ensuring the normal use of the voltage transformer 1. The insulating protection plate 6 slides downward and drives the two fixed blocks 12 to slide downward to squeeze the tops of the two positioning blocks 17. The fixed block 12 slides downward and squeezes the top of the positioning block 17 through the extrusion slope 13, thereby causing the fixed block 12 to slide and squeeze the spring 14, and the spring 14 gives the fixed block 12 a reverse elastic force.

[0043] Step 4: When the fixed block 12 slides to the position of the positioning slot 18, the spring 14 can release the elastic force and push the fixed block 12 to slide in the opposite direction and get into the inside of the positioning slot 18. The insulating protection plate 6 can be fixedly installed on the surface of the two positioning blocks 17 through the two positioning slots 18, and finally the protection of the four rear terminals 5 is completed, which is convenient for the staff to install the insulating protection plate 6 and improves the convenience of installation of the insulating protection plate 6. By hiding the four rear terminals 5 for experiments in the placement groove 7, the terminals 5 are prevented from being exposed to the outside, which prevents the terminals 5 from being corroded by the atmospheric environment, rain, snow, wind and sand, and prevents the terminals 5 from rusting and causing poor electrical contact or open circuit, thereby ensuring safe power supply operation.

[0044] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An insulation assembly for a 10kV voltage transformer, characterized in that: include: Voltage transformer (1) and insulation protection device; Four mounting blocks (2) are fixedly connected to the surface of the voltage transformer (1), bolts (3) are installed inside the four mounting blocks (2), three insulators (4) are installed on the top of the voltage transformer (1), and fourteen wiring terminals (5) are installed on the top of the voltage transformer (1); The insulation protection device comprises an insulation protection plate (6), two top rods (8), a pressure rod (9), two limit clamping balls (10), two fixed clamping blocks (12) and two springs (14); the insulation protection plate (6) is slidably mounted on the top of the voltage transformer (1); a placement groove (7) is provided at the bottom of the insulation protection plate (6); four rear wiring terminals (5) are hidden inside the placement groove (7); the two top rods (8) are slidably connected inside the insulation protection plate (6); the pressure rod (9) is fixedly connected to the rear ends of the two top rods (8); the two limit clamping balls (10) are respectively fixedly connected to the front ends of the two top rods (8); the left and right ends of the insulation protection plate (6) are both provided with sliding grooves (11); the two fixed clamping blocks (12) are respectively slidably connected inside the two sliding grooves (11); and the opposite ends of the two fixed clamping blocks (12) are both provided with extrusion inclined surfaces (13).

2. The 10 kV voltage transformer insulation assembly according to claim 1, characterized in that: The two springs (14) are respectively fixedly connected to the surfaces of the two fixed blocks (12); one end of the spring (14) away from the fixed blocks (12) is fixedly connected to the inner wall of the slide groove (11).

3. The 10 kV voltage transformer insulation assembly according to claim 1, characterized in that: Trapezoidal grooves (15) are provided on the surfaces of the two fixed clamping blocks (12), and the surfaces of the two limiting clamping balls (10) are in contact with the inner walls of the two trapezoidal grooves (15) respectively.

4. The 10 kV voltage transformer insulation assembly according to claim 1, characterized in that: Two positioning blocks (17) are fixedly connected to the top of the voltage transformer (1).

5. The insulating assembly for a 10 kV voltage transformer according to claim 4, characterized in that: Four L-shaped card blocks (16) are fixedly connected to the surface of the insulating protection plate (6), and the four L-shaped card blocks (16) are slidably connected to the surfaces of the two positioning card blocks (17).

6. The insulating assembly for a 10 kV voltage transformer according to claim 5, characterized in that: The surfaces of the two positioning blocks (17) are both provided with positioning slots (18), and the opposite ends of the two fixed blocks (12) are respectively slidably engaged in the interiors of the two positioning slots (18).

7. A method for installing an insulation assembly for a 10kV voltage transformer, characterized in that: The steps include: S1: When the four connection terminals (5) on the rear side need to be used, the staff can press the two push rods (8) to the front side through the pressure rod (9), and the two push rods (8) slide to the front side and drive the two limit clamping balls (10) to slide to the front side to squeeze the inner walls of the two trapezoidal slots (15). At this time, the two fixed clamping blocks (12) slide relatively under the squeezing action of the two limit clamping balls (10), and the fixed clamping blocks (12) slide and squeeze the spring (14). The spring (14) gives the trapezoidal slot (15) a reverse elastic force, and the two push rods (8) can be limited by the two limit clamping balls (10) to prevent the two push rods (8) from moving out of the interior of the insulating protection plate (6). The two fixed clamping blocks (12) slide relatively and move out of the interior of the two positioning slots (18), thereby releasing the fixing action on the insulating protection plate (6); S2: The staff member directly slides the insulating protection plate (6) upward, and the insulating protection plate (6) slides upward and drives the four L-shaped blocks (16) to slide upward and detach from the surfaces of the two positioning blocks (17) to complete the disassembly, and finally releases the protective effect of the four rear terminal blocks (5); S3: When the staff needs to protect the four wiring terminals (5) at the rear side, the staff picks up the insulating protection plate (6) and slides it directly downward. The insulating protection plate (6) slides downward and drives the four L-shaped blocks (16) to slide downward and get stuck on the surfaces of the two positioning blocks (17). The insulating protection plate (6) is limited and fixed by the four L-shaped blocks (16) to ensure that the insulating protection plate (6) can slide vertically downward to prevent the insulating protection plate (6) from tilting during installation. This not only makes it convenient for the staff to install it, but also allows the insulating protection plate (6) to be positioned vertically by the four L-shaped blocks (16). The plate (6) is fixed to ensure the stability of the installation of the insulating protection plate (6) and to prevent the insulating protection plate (6) from falling off and affecting the use of the voltage transformer (1), thereby ensuring the normal use of the voltage transformer (1); the insulating protection plate (6) slides downward and drives the two fixed card blocks (12) to slide downward to squeeze the tops of the two positioning card blocks (17); the fixed card block (12) slides downward and squeezes the tops of the positioning card blocks (17) through the squeezing inclined surface (13), thereby causing the fixed card block (12) to slide and squeeze the spring (14), and the spring (14) gives the fixed card block (12) a reverse elastic force; S4: When the fixed card block (12) slides to the position of the positioning card slot (18), the spring (14) can release the elastic force and push the fixed card block (12) to slide in the opposite direction and get into the inside of the positioning card slot (18). The insulating protection plate (6) can be fixedly installed on the surface of the two positioning card blocks (17) through the two positioning card slots (18), and finally the protective effect of the four rear side wiring terminals (5) is completed, which is convenient for the staff to install the insulating protection plate (6), and the convenience of installing the insulating protection plate (6) is improved. By hiding the four rear side wiring terminals (5) for experiments in the inside of the placement groove (7), the wiring terminals (5) are prevented from being exposed to the outside, and the wiring terminals (5) are prevented from being corroded by the atmospheric environment, rain, snow, wind and sand, etc., and the wiring terminals (5) are prevented from rusting, and the wiring terminals (5) are prevented from causing poor electrical contact or open circuit, thereby ensuring safe power supply operation.

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