High-voltage vacuum circuit breaker stroke on-line monitoring device

Abstract

The utility model relates to an on-line monitoring device for the stroke of a high-voltage vacuum circuit breaker. The high-voltage vacuum circuit breaker comprises a rotating main shaft, a threaded hole arranged at the end part of the rotating main shaft, and a protective plate arranged at the end part area of the rotating main shaft, the stroke on-line monitoring device comprises an installation support, an adapter plate, an encoder, an adapter shaft and a coupler. The mounting bracket is mounted on the protective plate; the adapter plate is mounted on the mounting bracket; avoiding holes which are coaxial with the rotating main shaft are formed in the protective plate, the mounting bracket and the adapter plate; the encoder is mounted on the adapter plate; one end of the coupling shaft is connected with a threaded hole in the end part of the rotating main shaft; two ends of the encoder are respectively connected with the encoder rotating shaft and the other end of the adapter shaft; according to the utility model, the adapter shaft is additionally arranged by using the original threaded hole of the circuit breaker, and the encoder is arranged on the protective plate, so that on-line monitoring of the mechanical characteristics of the circuit breaker is realized on the basis of not changing the original mechanical structure of the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker monitoring, and specifically to an online monitoring device for the travel of a high-voltage vacuum circuit breaker. Background Technology

[0002] High-voltage circuit breakers are mainly used in power systems to break lines or equipment carrying load current and near-zero load capacitive current, and are one of the important devices to ensure the safe and reliable operation of the power system.

[0003] The reliable operation of high-voltage circuit breakers is crucial to the stability of the entire power grid. Because high-voltage circuit breaker failures can lead to severe power outages, traditional periodic maintenance methods often fail to detect potential faults in real time. Effective online monitoring technology can schedule reasonable maintenance plans based on the actual condition of the equipment, avoiding over-maintenance or under-maintenance. This reduces maintenance costs while ensuring reliable equipment operation.

[0004] Key mechanical parameters of the opening and closing process of high-voltage circuit breakers can directly reflect the equipment status of the circuit breaker and are the core content of online circuit breaker monitoring. Obtaining these parameters requires online monitoring of the circuit breaker's opening and closing stroke; therefore, online monitoring of the stroke is crucial for online monitoring of the circuit breaker's mechanical characteristics.

[0005] During the opening and closing process of a circuit breaker, the rotating spindle is more convenient to obtain the opening and closing stroke curves from the installation and trajectory monitoring of other moving structural components.

[0006] Due to significant differences in the structure of high-voltage circuit breakers produced by different manufacturers, such as Beijing ABB (model LTB145D1 / B), constrained by the circuit breaker structure, it is challenging to install mechanical characteristic sensors for online monitoring within a limited space without altering the original mechanical structure of the circuit breaker. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an online monitoring device for the travel of a high-voltage vacuum circuit breaker.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: an online monitoring device for the travel of a high-voltage vacuum circuit breaker, wherein the Beijing ABB high-voltage vacuum circuit breaker includes a rotating spindle, a threaded hole disposed at the end of the rotating spindle, and a protective plate disposed in the end region of the rotating spindle;

[0009] The online stroke monitoring device includes a mounting bracket, an adapter plate, an encoder, an adapter shaft, and a coupling; the mounting bracket is mounted on a protective plate; the adapter plate is mounted on the mounting bracket; the protective plate, the mounting bracket, and the adapter plate are all provided with clearance holes that are coaxially placed with the rotating spindle; the encoder is mounted on the adapter plate; one end of the adapter shaft is connected to a threaded hole at the end of the rotating spindle; the encoder passes through the clearance hole and is connected to the other end of the encoder rotating shaft and the adapter shaft, respectively.

[0010] Preferably, the adapter shaft includes a threaded section and a smooth section; the threaded section is threadedly connected to a threaded hole at the end of the rotating spindle;

[0011] The guard plate is provided with a first clearance hole placed coaxially with the rotating spindle, and bracket fixing holes located on both sides of the first clearance hole; the edge of the guard plate is also provided with multiple mounting fixing holes.

[0012] The mounting bracket includes a U-shaped body and connecting portions respectively disposed at both ends of the U-shaped body; a second clearance hole is provided in the middle of the U-shaped body, and transition fixing holes are located on both sides of the second clearance hole; the connecting portions are respectively provided with bracket connecting holes corresponding to the bracket fixing holes;

[0013] The adapter plate includes an annular body and extensions respectively disposed on the edge of the annular body; a third clearance hole is provided in the middle of the annular body, and a plurality of encoder locking holes are evenly placed in the circumferential direction with the third clearance hole as the center; the extensions are respectively provided with adapter connection holes corresponding to the adapter fixing holes.

[0014] The encoder has multiple mounting holes corresponding to the encoder locking holes;

[0015] The two ends of the coupling are connected to the optical shaft section and the rotating shaft, respectively.

[0016] Preferably, the adapter shaft further includes a locking nut; the locking nut is threadedly connected to the threaded section, and when the threaded section is threadedly connected to the threaded hole at the end of the rotating spindle, tightening the locking nut tightly fits the end of the rotating spindle to achieve locking.

[0017] Preferably, both the bracket connection hole and the adapter connection hole are elongated holes.

[0018] Preferably, the coupling is a diaphragm coupling with high torsional stiffness and low inertia.

[0019] Preferably, the protective plate is provided with an observation hole for observing the opening and closing position of the circuit breaker.

[0020] Preferably, the protective plate, mounting bracket, adapter plate, and adapter shaft are all made of metal.

[0021] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] This utility model utilizes the existing threaded hole of the circuit breaker to install an adapter shaft, while the encoder is installed on the protective plate. Without changing the original mechanical structure of the circuit breaker, it realizes online monitoring of the mechanical characteristics of the circuit breaker, and has the advantages of simple and compact structure and convenient installation. Attached Figure Description

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0024] Appendix Figure 1 This is a schematic diagram of the structure of the end region of the rotating spindle of the Beijing ABB high-voltage vacuum circuit breaker described in this utility model;

[0025] Appendix Figure 2 This is an exploded view of the Beijing ABB high-voltage vacuum circuit breaker travel online monitoring device described in this utility model;

[0026] Appendix Figure 3 This is a schematic diagram of the installation of the Beijing ABB high-voltage vacuum circuit breaker travel online monitoring device described in this utility model;

[0027] Appendix Figure 4 This is a schematic diagram of the structure of the protective plate in this utility model;

[0028] Appendix Figure 5 This is a schematic diagram of the mounting bracket in this utility model;

[0029] Appendix Figure 6 This is a schematic diagram of the structure of the adapter plate in this utility model;

[0030] Appendix Figure 7 This is a schematic diagram of the encoder structure in this utility model;

[0031] Appendix Figure 8 This is a schematic diagram of the structure of the adapter shaft in this utility model.

[0032] The components are as follows: 11. Rotary spindle; 12. Threaded hole; 13. Guard plate; 131. First clearance hole; 132. Bracket fixing hole; 133. Mounting fixing hole; 134. Observation hole; 14. Fixing bolt; 21. Mounting bracket; 211. U-shaped body; 212. Connecting part; 213. Second clearance hole; 214. Adapter fixing hole; 215. Bracket connecting hole; 22. Adapter plate; 221. Annular body; 222. Extension part; 223. Third clearance hole; 224. Encoder locking hole; 225. Adapter connecting hole; 23. Encoder; 231. Rotary shaft; 232. Mounting hole; 24. Adapter shaft; 241. Threaded section; 242. Optical shaft section; 25. Coupling. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 As shown, the Beijing ABB high-voltage vacuum circuit breaker of this utility model includes a rotating spindle 11, a threaded hole 12 disposed at the end of the rotating spindle 11, and a protective plate 13 disposed in the end region of the rotating spindle 11.

[0035] like Figure 2-3 As shown, the online stroke monitoring device includes a mounting bracket 21, an adapter plate 22, an encoder 23, an adapter shaft 24, and a coupling 25. The mounting bracket 21 is mounted on the protective plate 13. The adapter plate 22 is mounted on the mounting bracket 21. The protective plate 13, the mounting bracket 21, and the adapter plate 22 are all provided with clearance holes that are coaxially placed with the rotating spindle 11. The encoder 23 is mounted on the adapter plate 22. One end of the adapter shaft 24 is connected to the threaded hole 12 at the end of the rotating spindle 11. The two ends of the encoder 23 are respectively connected to the rotating shaft 231 of the encoder 23 and the other end of the adapter shaft 24.

[0036] During operation: The encoder 23 rotates together with the main rotating shaft 11 of the circuit breaker through the coupling 25 and the adapter shaft 24, and senses the rotation angle and rotation direction of the main rotating shaft 11 in real time during the opening and closing process, thereby extracting relevant parameters of the circuit breaker's mechanical characteristics with the rotation angle as the analysis object.

[0037] By multiplying the obtained angular displacement information by the rotation radius and transmission ratio of the rotating spindle 11, the linear travel information of the circuit breaker's opening and closing process can be obtained, and then the relevant parameters of the circuit breaker's mechanical characteristics with the motion distance as the analysis object can be extracted.

[0038] In this embodiment, encoder 23 is an electric rotary incremental encoder, which converts the angular displacement on the output shaft into pulse counting to determine the displacement through photoelectric conversion. It has high stability, shock resistance, simple and reliable installation, and can realize online monitoring of the stroke of high voltage circuit breakers.

[0039] Specifically, the encoder 23 uses a metal housing with three mounting holes 232. The main body is 21mm high to minimize space occupation. The stainless steel shaft has a diameter of 6mm, which provides higher stability. The speed is 5000rpm, which also provides a high amount of data and high acquisition accuracy during the instantaneous opening and closing of the circuit breaker.

[0040] In this embodiment, the original guard plate 13 was redesigned. The guard plate 13 is made of metal material, preferably aluminum alloy. It is provided with a first clearance hole 131 placed coaxially with the rotating spindle 11, and bracket fixing holes 132 located on both sides of the first clearance hole 131. The edge of the guard plate 13 is also provided with five mounting fixing holes 133.

[0041] Furthermore, the lower middle area of ​​the guard plate 13 is provided with an observation hole 134 for observing the opening and closing position of the circuit breaker, so as to facilitate observation of the opening and closing status.

[0042] In this embodiment, the mounting bracket 21 is made of metal, preferably aluminum alloy, and is used to connect the adapter plate 22 and the guard plate 13. It includes a U-shaped body 211 and connecting portions 212 respectively provided at both ends of the U-shaped body 211. The middle part of the U-shaped body 211 is provided with a second clearance hole 213 and adapter fixing holes 214 located on both sides of the second clearance hole 213. The connecting portions 212 are respectively provided with bracket connecting holes 215 corresponding to the bracket fixing holes 132. The second clearance hole 213 is used to avoid the rotating shaft 231 of the coupling 25 and the encoder 23.

[0043] In this embodiment, the adapter plate 22 is made of metal, preferably aluminum alloy, and is used to change the mounting method of the encoder 23, which can facilitate assembly and locking from the other side. It includes an annular body 221 and extensions 222 respectively provided on the edge of the annular body 221. The annular body 221 is provided with a third clearance hole 223 in the middle and three encoder locking holes 224 corresponding to the mounting holes 232 on the encoder 23. The extensions 222 are provided with adapter connection holes 225 corresponding to the adapter fixing holes 214. The third clearance hole 223 is used to avoid the step of the encoder 23.

[0044] In this embodiment, the adapter shaft 24 is made of metal, preferably stainless steel, and is used to replace the fixing bolt 14 that connects the end of the rotating spindle 11 to the threaded hole 12. The shaft diameter is 6mm and the length is 10mm. The adapter shaft 24 includes a threaded section 241, a smooth shaft section 242 and a locking nut. The threaded section 241 is threadedly connected to the threaded hole 12 at the end of the rotating spindle 11. The locking nut is installed on the threaded section 241.

[0045] In this embodiment, the two ends of the coupling 25 are connected to the optical shaft section 242 and the rotating shaft 231 respectively. A diaphragm coupling 25 with high torsional stiffness and low inertia is selected. The bore diameter is 6mm, which is consistent with the diameter of the rotating shaft 231 of the encoder 23. A clamping locking scheme is adopted.

[0046] Furthermore, both the bracket connection hole 215 and the adapter connection hole 225 are elongated holes, and the bracket connection hole 215 and the elongated hole of the adapter connection are perpendicular to each other. This not only allows for a certain amount of deviation adjustment, but also allows for fine adjustment of the installation position of the encoder 23 during the installation process.

[0047] The installation steps are as follows:

[0048] 1. Remove the guard plate 13, remove the fixing bolt 14 that connects the end of the rotating spindle 11 to the threaded hole 12, thread the threaded section 241 of the adapter shaft 24 to the threaded hole 12 at the end of the rotating spindle 11, and then tighten the lock nut until it fits tightly with the end of the rotating spindle 11 to achieve locking.

[0049] 2. Fit one end of the coupling 25 onto the smooth shaft section 242 of the adapter shaft 24, and tighten the clamping screws on the coupling 25.

[0050] 3. Install the protective plate 13 and tighten it by passing five M6*10 cylindrical head hexagonal screws through the mounting holes 133 respectively;

[0051] 4. Use two M5*8 cylindrical head hex screws to pass through the bracket connection hole 215 and connect to the bracket fixing hole 132 to assemble the mounting bracket 21 onto the protective plate 13, and pre-tighten the screws;

[0052] 5. Use three M3*8 countersunk screws to pass through the encoder locking hole 224 and connect to the mounting hole 232 to assemble the encoder 23 onto the adapter plate 22, and tighten the screws.

[0053] 6. Insert the rotating shaft 231 into the other end of the coupling 25 until the adapter plate 22 is in contact with the mounting bracket 21. Then, use two M5*8 cylindrical head hexagonal screws to pass through the adapter connection hole 225 and connect to the adapter fixing hole 214. Assemble the adapter plate 22 on the mounting bracket 21 and pre-tighten the screws.

[0054] 7. Check whether the rotating shaft 231 of encoder 23 moves smoothly into and out of the coupling 25 hole and rotates smoothly. If it does, tighten the previously tightened screws.

[0055] 8. Tighten the clamping screws of coupling 25 and rotating shaft 231 to complete the installation.

[0056] In this embodiment, by setting a U-shaped mounting bracket 21, when the mounting bracket 21 is installed on the protective plate 13, it can form a hollow part with the protective plate 13, which makes it easy to finally tighten the clamping screws of the coupling 25 and the rotating shaft 231 to complete the installation.

[0057] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.

Claims

1. A high-voltage vacuum circuit breaker travel online monitoring device, wherein the high-voltage vacuum circuit breaker includes a rotating spindle, a threaded hole disposed at the end of the rotating spindle, and a protective plate disposed in the end region of the rotating spindle; Its features are: The online stroke monitoring device includes a mounting bracket, an adapter plate, an encoder, an adapter shaft, and a coupling; the mounting bracket is mounted on a protective plate; the adapter plate is mounted on the mounting bracket; the protective plate, the mounting bracket, and the adapter plate are all provided with clearance holes that are coaxially placed with the rotating spindle; the encoder is mounted on the adapter plate; one end of the adapter shaft is connected to a threaded hole at the end of the rotating spindle; the encoder passes through the clearance hole and is connected to the other end of the encoder rotating shaft and the adapter shaft, respectively.

2. The online monitoring device for the stroke of a high-voltage vacuum circuit breaker according to claim 1, characterized in that: The adapter shaft includes a threaded section and a smooth section; the threaded section is threadedly connected to the threaded hole at the end of the rotating spindle. The guard plate is provided with a first clearance hole placed coaxially with the rotating spindle, and bracket fixing holes located on both sides of the first clearance hole; the edge of the guard plate is also provided with multiple mounting fixing holes. The mounting bracket includes a U-shaped body and connecting portions respectively disposed at both ends of the U-shaped body; a second clearance hole is provided in the middle of the U-shaped body, and transition fixing holes are located on both sides of the second clearance hole; the connecting portions are respectively provided with bracket connecting holes corresponding to the bracket fixing holes; The adapter plate includes an annular body and extensions respectively disposed on the edge of the annular body; a third clearance hole is provided in the middle of the annular body, and a plurality of encoder locking holes are evenly placed in the circumferential direction with the third clearance hole as the center; the extensions are respectively provided with adapter connection holes corresponding to the adapter fixing holes. The encoder has multiple mounting holes corresponding to the encoder locking holes; The two ends of the coupling are connected to the optical shaft section and the rotating shaft, respectively.

3. The online monitoring device for the stroke of a high-voltage vacuum circuit breaker according to claim 2, characterized in that: The adapter shaft also includes a locking nut; the locking nut is threadedly connected to the threaded section. After the threaded section is threadedly connected to the threaded hole at the end of the rotating spindle, tightening the locking nut will make it fit tightly against the end of the rotating spindle, thus achieving locking.

4. The online monitoring device for the stroke of a high-voltage vacuum circuit breaker according to claim 2, characterized in that: Both the bracket connection hole and the adapter connection hole are elongated holes.

5. The online monitoring device for the stroke of a high-voltage vacuum circuit breaker according to claim 1, characterized in that: The coupling is a diaphragm coupling with high torsional stiffness and low inertia.

6. The online monitoring device for the travel of a high-voltage vacuum circuit breaker according to claim 1, characterized in that: The guard plate is provided with an observation hole for observing the opening and closing position of the circuit breaker.

7. The online monitoring device for the travel of a high-voltage vacuum circuit breaker according to claim 1, characterized in that: The protective plate, mounting bracket, adapter plate, and adapter shaft are all made of metal.

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