Speed sensor auxiliary tool for 27.5 KV vacuum circuit breaker test

Abstract

The utility model belongs to the technical field of auxiliary fixing tools, and provides a speed sensor auxiliary tool for a 27.5 KV vacuum circuit breaker test, which comprises an upper fixing piece, a right-angle positioning plate is fixedly connected to the top surface of the upper fixing piece, a strip-shaped connecting groove penetrates through the surface of the upper fixing piece, and a first fixing groove is formed in the side wall of the right-angle positioning plate; four groups of second fixing grooves are symmetrically formed in the surface of the lower fixing piece, and four groups of connecting holes are further formed in the surface of the lower fixing piece; according to the utility model, through the arrangement of the upper fixing member and the lower fixing member and the cooperative constraint of the two groups of fixing members, the axial offset of the transmission rod of the sensor is greatly reduced, the installation precision is greatly improved, and the high-precision detection of the dynamic parameters of the vacuum circuit breaker is realized through replacing magnetic adsorption with mechanical coupling and combining an adjustable long groove structure and a dynamic compensation mechanism.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary fixing tools, specifically an auxiliary tool for a speed sensor used in testing a 27.5KV vacuum circuit breaker. Background Technology

[0002] The 27.5kV vacuum circuit breaker is a key switching device for powering the railway traction network. Working in conjunction with integrated automation systems, it controls and protects the traction network during power supply and shutdown. When a fault occurs in the traction network, it can quickly disconnect the fault point, thereby ensuring the safe and stable operation of the railway power supply. The switching characteristic test of the 27.5kV vacuum circuit breaker is an indispensable inspection method in the commissioning test, equipment fault diagnosis, and routine maintenance of 27.5kV vacuum circuit breakers in traction substations.

[0003] With the intelligent development of railway traction power supply systems, the requirements for accurate testing of the mechanical characteristics of vacuum circuit breakers are increasing. The HVS-50 high-voltage switch characteristic tester and its accessories, commonly used in existing technologies, have significant defects: the linear travel sensors (50mm / 200mm / 300mm specifications) require a magnetic universal bracket for fixation; currently, the ZN42-27.5KV indoor vacuum circuit breaker (hereinafter referred to as 27.5KV vacuum circuit breaker) produced by Sichuan Electric Co., Ltd. is widely used in railway bureaus across the country, and the arc-extinguishing chamber shell of the 27.5KV vacuum circuit breaker generally uses magnetic insulation material, causing the magnetic adsorption device to completely fail. It is worth noting that, according to investigations, in recent years, during the annual inspection of railway traction substation equipment, cases of distorted test data due to improper sensor installation accounted for 32%, seriously threatening the reliability of safety assessments of power supply system substation equipment.

[0004] When installing a conventional linear resistance sensor, it is necessary to ensure that the sensor's motion axis can move linearly. The sensor is fixed with a magnetic universal bracket, which supports the sensor. However, since the vacuum package of a 27.5KV vacuum circuit breaker is currently magnetically insulated, a universal bracket with magnets cannot be used to adhere and fix it to the porcelain insulation, making it impossible to install the speed sensor.

[0005] As can be seen from the above, the existing 27.5KV vacuum circuit breaker cannot be fitted with a magnetic fixing device on its outer wall, making it difficult to install a speed sensor. Because the material of the instrument does not match the material of the actual circuit breaker, the sensor installation is unstable and the motion synchronization is deviated, which seriously affects the measurement accuracy of the opening and closing speed and stroke. The error of measuring the reading and measuring the standard line with vernier calipers is very large.

[0006] To address this issue, those skilled in the art have proposed a speed sensor auxiliary tool for testing 27.5KV vacuum circuit breakers to solve the problems raised in the background art. Utility Model Content

[0007] To address the aforementioned technical problems, this utility model provides an auxiliary tool for a speed sensor used in testing 27.5KV vacuum circuit breakers. This tool solves the problem that existing technologies cannot accommodate magnetic fixing devices on the outer wall of 27.5KV vacuum circuit breakers, making it difficult to install speed sensors.

[0008] An auxiliary tool for a speed sensor used in testing a 27.5KV vacuum circuit breaker includes: an upper fixing component, a right-angle positioning plate fixedly connected to the top surface of the upper fixing component, a strip-shaped connecting groove penetrating the surface of the upper fixing component, and a first fixing groove opened at the side wall of the right-angle positioning plate;

[0009] The lower fixing component has four sets of second fixing grooves symmetrically opened on its surface, and four sets of connecting holes are also opened on its surface.

[0010] Preferably, both sides of the lower fixing member are fixedly connected with bent portions.

[0011] Preferably, the second fixing slot hole diameter is adapted to M10-M12 bolts.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model, by setting up upper and lower fixing parts, achieves the fixation of the tool to the lower contact transmission part of the 27.5KV vacuum circuit breaker manufactured by Sichuan Electric Co., Ltd., and to the circuit breaker. After installing the linear speed sensor, it achieves the effects of safety, accuracy and time saving in the test process. The two sets of fixing parts work together to constrain and greatly reduce the axial offset of the sensor transmission rod, which greatly improves the installation accuracy. By replacing magnetic adsorption with mechanical coupling, combined with the adjustable long slot structure and dynamic compensation mechanism, high-precision detection of the dynamic parameters of the vacuum circuit breaker is achieved. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the right side of the upper fixing component;

[0015] Figure 2 This is a three-dimensional structural diagram of the right side of the lower fixing component;

[0016] Figure 3 This is a three-dimensional structural diagram of the left side of the upper fixing component;

[0017] Figure 4 This is a three-dimensional structural diagram of the left side of the lower fixing component;

[0018] Figure 5 Schematic diagram of the linear velocity sensor mounting structure;

[0019] Figure 6This is a schematic diagram of the auxiliary tool installed at the lower outlet socket and conductive clamp of the arc-extinguishing chamber;

[0020] Figure 7 A schematic diagram of the structure for adding an extension screw to this auxiliary tool.

[0021] In the picture:

[0022] 1. Upper fixing component; 2. Right-angle positioning plate; 3. Strip connecting groove; 4. First fixing groove; 5. Lower fixing component; 6. Bending part; 7. Second fixing groove; 8. Connecting hole. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] Example: As attached Figure 1 To be continued Figure 7 As shown: This utility model provides an auxiliary tool for a speed sensor used in testing a 27.5KV vacuum circuit breaker, including an upper fixing part 1 and a lower fixing part 5;

[0025] The top surface of the upper fixing part 1 is fixedly connected to the right angle positioning plate 2. The right angle positioning plate 2 cooperates with the protrusion at the lower end of the arc-extinguishing chamber of the vacuum circuit breaker. The surface of the right angle positioning plate 2 is tightly connected to the conductive clamp at the conductive rod of the moving contact of the arc-extinguishing chamber. The surface of the upper fixing part 1 has a strip-shaped connecting groove 3. The strip-shaped connecting groove 3 is fixedly connected to the transmission rod of the linear speed sensor through a bolt assembly. The right angle positioning plate 2 has a first fixing groove 4 on its side wall.

[0026] The lower fixing member 5 has four sets of second fixing grooves 7 symmetrically opened on its surface, and four sets of connecting holes 8 are also opened on its surface; the lower fixing member 5 can be fixed to the lower end of the circuit breaker arc extinguishing chamber through the second fixing grooves 7 and bolts.

[0027] Both sides of the lower fixing member 5 are fixedly connected with bent parts 6.

[0028] The second fixing groove 7 has a hole diameter that is compatible with M10-M12 bolts.

[0029] As attached Figure 5 As shown, the lower fixing member 5 is fixed to the lower end of the lower outlet seat of the arc-extinguishing chamber of the circuit breaker by means of the second fixing groove 7 and bolts. The setting of the second fixing groove 7 improves the flexibility of fixing. The connecting plates on both sides of the linear speed sensor are connected to the connecting holes 8 by bolts. The upper fixing member 1 is tightly connected to the conductive clamp at the conductive rod of the moving contact of the arc-extinguishing chamber by bolts and the first fixing groove 4, so as to fix the upper fixing member 1. The transmission rod of the linear speed sensor is fixedly connected to the strip connecting groove 3 by bolt assembly.

[0030] As can be seen from the above, the operator places the lower fixing part 5 on the bottom support surface of the circuit breaker arc-extinguishing chamber and pre-fixes it with the original support bolts through four sets of second fixing grooves 7; the 22mm effective adjustment stroke of the second fixing groove 7 can be adapted to M10-M12 bolts with a spacing tolerance of ±3mm, and the linear compensation capability of the long groove is used to achieve rapid alignment.

[0031] The right-angle reference surface of the right-angle positioning plate 2 is attached to the flange of the arc-extinguishing chamber, and the first fixing groove 4 and the flange threaded hole are used for rough positioning. At this time, the lateral adjustment margin of the strip connecting groove 3 is ±70mm, which can compensate for the deviation of the sensor installation axis. The adjustment bolt assembly is adjusted to make the parallelism error between the linear speed sensor transmission rod axis and the moving contact trajectory. After the laser alignment instrument is used to confirm the detection, the bolts are tightened to form a rigid-flexible coupling transmission system.

[0032] By coordinating the constraints of the upper fixing part 1 and the lower fixing part 5, the axial offset of the sensor transmission rod is greatly reduced, and the installation accuracy is greatly improved. This device achieves high-precision detection of the dynamic parameters of the vacuum circuit breaker by replacing magnetic adsorption with mechanical coupling and combining an adjustable long slot structure and a dynamic compensation mechanism.

[0033] The method for making auxiliary tools for sensors used in 27.5kV vacuum circuit breaker testing is as follows:

[0034] 1. Material selection: Select high-strength, high-toughness steel with a thickness of 2-3 mm, which can withstand greater pressure and impact and is not easily broken when subjected to external forces.

[0035] 2. Drawing: Based on the vacuum interrupter and transmission parts and overall structure of the 27.5KV vacuum circuit breaker, design auxiliary tool drawings to ensure that the design drawings and the screw hole diameter, length, width and height of the connection between the vacuum circuit breaker and the linear speed sensor meet the requirements.

[0036] 3. Positioning: According to the design drawings, locate the drilling positions on the steel plate and check that the positioning is completely consistent with the drawings.

[0037] 4. Drilling: Cut and drill holes according to the positioning. Bend the upper fastener 1 at a 90-degree angle according to the design dimensions in the drawing. Check that all dimensions meet the design requirements in the drawing.

[0038] 5. Fixing: Fix the upper fixing part 1 to the external bolt of the transmission rod at the lower end of the arc-extinguishing chamber of the vacuum circuit breaker. Fix the lower fixing part 5 to the linear speed sensor provided by the instrument with a 1 mm bolt. Then, select two 10 mm (for small current vacuum circuit breakers) or 12 mm (for large current vacuum circuit breakers) bolts according to the circuit breaker specifications. Fix the lower fixing part 5 with the linear speed sensor to the fixing screw hole at the lower end of the vacuum circuit breaker. Check that all fixing parts are firmly connected and the linear sensor is firmly installed. Perform a switching characteristic test on the vacuum circuit breaker. The switch action is normal, the linear sensor movement is normal, and the instrument reads data with high accuracy.

[0039] Workflow: The lower fixing component 5 is connected to the lower outlet seat support bolt of the arc-extinguishing chamber via four sets of adjustable second fixing slots 7. The linear compensation capability of the long slots eliminates the installation hole position deviation, forming a stable base. The right-angle positioning plate 2 is precisely fitted with the conductive clamp at the conductive rod of the arc-extinguishing chamber. Spatial positioning is achieved through the first fixing slot 4 and bolts, ensuring the accuracy of the sensor installation reference surface. The sensor transmission rod is slidably connected to the upper fixing component 1 via the strip connecting slot 3. This slot design allows for lateral fine adjustment to compensate for axial deviation and provides precise guidance during dynamic processes, making the movement trajectory of the transmission rod completely synchronized with the moving contact of the circuit breaker. When the circuit breaker opens and closes, the linear movement of the moving contact is transmitted to the sensor without hysteresis through the transmission rod. The rigid constraint of the mechanical structure effectively suppresses vibration and offset, ensuring that the sensor accurately captures the displacement-time relationship of the contact. By upgrading the traditional magnetic adsorption fixing method to mechanical coupling positioning, combined with a multi-level adjustment mechanism, the installation problem of magnetically insulated surfaces is completely solved. The dynamic compensation design significantly improves the measurement accuracy and data reliability, providing solid technical support for the performance evaluation of the switching characteristics of vacuum circuit breakers.

[0040] This auxiliary tool is convenient and intuitive to install with linear speed sensors provided by vacuum circuit breakers and instruments. It can be adapted to the screw hole installation of 27.5KV vacuum circuit breakers and the installation of linear speed sensors. It has good portability, saves time, has good safety performance, and ensures high accuracy in installation of moving parts and fastening.

[0041] Taking the 27.5KV vacuum circuit breaker produced by Sichuan Electric Co., Ltd. as an example, this auxiliary tool effectively solves the problem of installing the speed sensor used in the test of the vacuum circuit breaker. It can meet the requirements of fixing the tool to the lower contact transmission part of the 27.5KV vacuum circuit breaker and the circuit breaker. After installing the linear speed sensor, it achieves the functions of safety, test accuracy and saving test time in the test process. It can be widely used in the test after the vacuum circuit breaker fails, after major repair, in daily maintenance, before new operation and before the new circuit breaker leaves the factory.

[0042] As attached Figure 7As shown, by adding an extended screw, when the size of the upper fixing part 1 does not match that of the circuit breaker conductive rod, the position of the upper fixing part 1 can be positioned by adding an extended screw.

[0043] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary tool for testing a speed sensor in a 27.5kV vacuum circuit breaker, characterized in that: include: Upper fixing member (1), the top surface of the upper fixing member (1) is fixedly connected to a right angle positioning plate (2), the surface of the upper fixing member (1) is provided with a strip-shaped connecting groove (3), and the side wall of the right angle positioning plate (2) is provided with a first fixing groove (4); The lower fixing member (5) has four sets of second fixing grooves (7) symmetrically opened on its surface, and four sets of connecting holes (8) are also opened on its surface.

2. The speed sensor auxiliary tool for testing a 27.5KV vacuum circuit breaker as described in claim 1, characterized in that: The lower fixing member (5) has bent parts (6) fixedly connected to both sides of its side walls.

3. The speed sensor auxiliary tool for testing a 27.5KV vacuum circuit breaker as described in claim 1, characterized in that: The second fixing groove (7) has a hole diameter that is compatible with M10-M12 bolts.

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