Online monitoring device for characteristics of GIS combined electrical apparatus circuit breaker

Abstract

The utility model relates to an on-line monitoring device for characteristics of a GIS combined electric appliance circuit breaker. The on-line monitoring device comprises an extension shaft, a mounting bracket, a connecting assembly and a mechanical characteristic sensor, one end of the extension shaft is connected with a process hole in the end part of a circuit breaker rotating shaft; the mounting bracket is mounted on a fixing plate through a connecting assembly, and the fixing plate is positioned on one side of the end part of the rotating shaft; the mechanical characteristic sensor is mounted on the mounting bracket and is connected with the other end of the extension shaft; according to the utility model, the auxiliary hole and the fixing plate at the end part of the original rotating shaft of the circuit breaker are utilized, so that the installation problem of a mechanical characteristic sensor of the circuit breaker is solved, the function of the original circuit breaker is not influenced after installation, the sealing performance of a GIS cabinet is not damaged, and non-intrusive installation is realized.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker monitoring, and specifically to an online monitoring device for the characteristics of a GIS combined electrical circuit breaker. Background Technology

[0002] GIS (Gas Insulator System) is a combination of electrical equipment consisting of circuit breakers, disconnectors, grounding switches, instrument transformers, surge arresters, busbars, connectors, and outgoing terminals. All these devices or components are enclosed in a grounded metal casing filled with pressurized insulating gas; hence, it is also called a fully enclosed combination electrical system. GIS has the following characteristics:

[0003] 1. GIS is characterized by its compact structure (occupying only about 10% of the area of ​​a conventional substation (AIS));

[0004] 2. Because its main components are fully sealed, GIS is not affected by pollution, rain, salt spray and other atmospheric environments. GIS is particularly suitable for industrial pollution, harsh climate and high-altitude areas.

[0005] 3. In-service GIS systems are often used in locations where maintenance is difficult and requires long maintenance cycles due to their flexible configuration, convenient installation, and strong environmental adaptability.

[0006] 4. The successful development of large-capacity single-voltage circuit breakers and the application of zinc oxide surge arresters have greatly simplified the GIS structure, making it more compact to meet the miniaturization requirements.

[0007] In summary, since GIS is a fully enclosed combined power equipment, fault repair is extremely complex and difficult, so real-time operation monitoring of GIS is very important.

[0008] In GIS circuit breakers, the most critical function is controlling the conduction (closing) and disconnection (opening) of high-voltage electricity. Key mechanical performance parameters during the circuit breaker's opening and closing processes, such as stroke, speed, opening distance, overtravel, and rebound, directly reflect the status of the circuit breaker equipment.

[0009] Real-time monitoring of the mechanical characteristics of circuit breakers is the core of online monitoring of circuit breakers. To accurately obtain the mechanical characteristic parameters of circuit breakers, it is necessary to install the mechanical characteristic sensor of the circuit breaker on the main shaft without changing the original mechanical structure of the circuit breaker. At the same time, it is crucial not to damage the original airtightness of the GIS cabinet. In other words, it is necessary to achieve non-intrusive installation of the sensor in a limited space.

[0010] However, the structures of circuit breakers in GIS cabinets produced by different manufacturers vary significantly. Even different models of GIS cabinet circuit breakers with the same structure from the same manufacturer have significant differences in structural dimensions and installation positions. In addition, the compact structural space of GIS cabinets makes it difficult to install mechanical characteristic sensors in a limited space. Utility Model Content

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide an online monitoring device for the characteristics of GIS combined electrical circuit breakers.

[0012] To achieve the above objectives, the technical solution adopted by this utility model is: an online monitoring device for the characteristics of a GIS combined electrical circuit breaker, comprising an extension shaft, a mounting bracket, a connecting component, and a mechanical characteristic sensor;

[0013] One end of the extension shaft is connected to the process hole at the end of the circuit breaker rotating shaft;

[0014] The mounting bracket is mounted on the fixed plate via a connecting assembly, wherein the fixed plate is located on one side of the end of the rotating shaft;

[0015] The mechanical property sensor is mounted on a mounting bracket and connected to the other end of the extension shaft.

[0016] Preferably, the extension shaft includes a threaded section and a smooth shaft section that are coaxial and connected to each other, and a lock nut disposed on the threaded section; the threaded section is threadedly connected to the process hole at the end of the circuit breaker rotating shaft; the lock nut abuts against the end of the circuit breaker rotating shaft.

[0017] Preferably, the mechanical property sensor adopts a hollow shaft structure; the optical axis section of the extension shaft extends into the hollow shaft and is fixed by a set screw.

[0018] Preferably, the mechanical characteristic sensor has its own output shaft, which is connected to the optical axis section of the extension shaft via a coupling.

[0019] Preferably, the coupling is a double diaphragm coupling.

[0020] Preferably, the mounting bracket is L-shaped and includes a connecting part and a mounting part; the connecting part is provided with at least two vertically spaced connecting holes; the mounting part is provided with a clearance hole placed coaxially with the rotating shaft of the circuit breaker, and a plurality of mounting holes for mounting mechanical characteristic sensors placed around the clearance hole.

[0021] Preferably, the connecting hole is an elongated hole and is placed in a horizontal direction.

[0022] Preferably, the mounting bracket is integrally formed by punching and bending.

[0023] Preferably, the connecting assembly includes at least two bolts, corresponding nuts or clamping plates; the bolts pass through the connecting holes and are threadedly connected to the nuts or clamping plates to fix the mounting bracket to the fixing plate.

[0024] Preferably, one end of the clamping piece is provided with a threaded hole, and the other end is provided with anti-slip texture.

[0025] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0026] 1. This utility model utilizes the process hole and fixing plate at the end of the original rotating shaft of the circuit breaker to solve the problem of adding mechanical characteristic sensors to the circuit breaker, realizes online monitoring of the mechanical characteristics of the circuit breaker, provides data support for the prediction of the circuit breaker status, and does not affect the original circuit breaker function after installation, does not damage the sealing performance of the GIS cabinet, and realizes non-intrusive installation.

[0027] 2. This utility model can detect mechanical faults of circuit breakers in real time (such as linkage jamming, spring failure, etc.), avoiding cascading faults caused by circuit breaker failure to operate / misoperation, and reducing unplanned downtime;

[0028] 3. This utility model can replace traditional periodic maintenance, and maintenance can be arranged according to the actual condition, reducing power outage losses and personnel input, and lowering operation and maintenance costs;

[0029] 4. This utility model can extend the life of equipment and avoid irreversible damage to the equipment (such as mechanical deformation, etc.) through early intervention;

[0030] 5. This utility model can perform trend analysis based on collected data (such as a slow increase in tripping time, etc.) to achieve fault prediction and support the power grid's proactive defense strategy;

[0031] 6. This utility model can support the construction of smart grids and provide key data for digital substations;

[0032] 7. The installation structure of this utility model requires little additional space, and the structural components are easy to process, install, and disassemble.

[0033] Overall, it is beneficial to the stable and safe operation of the power system, facilitates the maintenance of circuit breakers, reduces maintenance costs and time, improves the maintainability and intelligence of equipment, reduces unplanned outages, and provides key data for the construction of smart grids. Attached Figure Description

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0035] Appendix Figure 1 This is a schematic diagram of the structure of an existing circuit breaker;

[0036] Appendix Figure 2 This is a schematic diagram of the installation of the extension shaft in this utility model;

[0037] Appendix Figure 3 This is a structural diagram of the extension shaft in this utility model;

[0038] Appendix Figure 4The mounting bracket is used in this utility model;

[0039] Appendix Figure 5 This is the connecting component in this utility model;

[0040] Appendix Figure 6 The clamping piece in this utility model;

[0041] Appendix Figure 7 This is a schematic diagram of the installation of the online mechanical property monitoring device in this utility model;

[0042] Appendix Figure 8 This is a schematic diagram of the online mechanical property monitoring device of this utility model from another angle.

[0043] The components are as follows: 1. Circuit breaker; 11. Rotary shaft end; 12. Process hole; 13. Fixing plate; 14. Reserved hole; 2. Online mechanical characteristic monitoring device; 21. Extension shaft; 211. Threaded section; 212. Plain shaft section; 213. Anti-loosening nut; 22. Mounting bracket; 221. Connecting part; 222. Mounting part; 223. Connecting hole; 224. Clearance hole; 225. Mounting hole; 23. Connecting assembly; 231. Bolt; 232. Nut; 233. Clamping plate; 2331. Threaded hole; 2332. Anti-slip texture; 24. Mechanical characteristic sensor; 25. Coupling. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0045] Appendix Figure 1-8 The online monitoring device for the characteristics of the GIS combined electrical circuit breaker described in this utility model includes an extension shaft 21, a mounting bracket 22, a connecting component 23, and a mechanical characteristic sensor 24.

[0046] One end of the extension shaft 21 is connected to the process hole 12 at the end of the rotating shaft 11 of the circuit breaker;

[0047] The mounting bracket 22 is mounted on the fixing plate 13 via the connecting assembly 23, wherein the fixing plate 13 is located on one side of the end 11 of the rotating shaft.

[0048] The mechanical property sensor 24 is mounted on the mounting bracket 22 and connected to the other end of the extension shaft 21.

[0049] This utility model utilizes the original process hole 12 and fixing plate 13 of the circuit breaker 1 to solve the problem of adding mechanical characteristic sensor 24 to the circuit breaker 1, realizes online monitoring of the mechanical characteristics of the circuit breaker, provides data support for the prediction of the status of the circuit breaker 1, and does not affect the original function of the circuit breaker 1 after installation, does not damage the sealing performance of the GIS cabinet, and realizes non-intrusive installation.

[0050] Specifically: By monitoring the rotating shaft of the circuit breaker through mechanical characteristic sensors, the angle, time, displacement, stroke and other information during the opening and closing process of the circuit breaker can be obtained, and then the relevant parameters of the mechanical characteristics of the circuit breaker with the rotation angle as the analysis object can be extracted.

[0051] By multiplying the obtained angular displacement information by the rotation radius and transmission ratio of the rotating spindle, 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.

[0052] Specifically, the circuit breaker is a Shunchi (CFPTA.120-40LB-FAR3) tank-type circuit breaker.

[0053] Furthermore, such as Figure 3 As shown, the extension shaft 21 includes a threaded section 211 and a smooth shaft section 212 connected to each other on the same axis, and an anti-loosening nut 213 provided on the threaded section 211; the threaded section 211 is threadedly connected to the process hole 12 of the end of the circuit breaker rotating shaft 11; the anti-loosening nut 213 abuts against the end of the circuit breaker rotating shaft.

[0054] Specifically, the extension shaft 21 is made of metal material, preferably 316 stainless steel, and is fixed to the process hole 12 at the end of the rotating shaft 11 by an M10 anti-loosening nut 213 via a threaded connection.

[0055] Furthermore, such as Figure 8 As shown, the mechanical characteristic sensor 24 has its own output shaft, which is connected to the optical shaft section 212 of the extension shaft 21 via the coupling 25. Due to the limited installation space of the circuit breaker, a high-precision rotary encoder based on photoelectric principle with a body thickness of 30.5mm and an output shaft diameter of 6mm and a depth of 10.5mm is selected to achieve high-precision and high-response efficiency of circuit breaker motion data acquisition.

[0056] Furthermore, such as Figure 8 As shown, the coupling 25 adopts a double diaphragm coupling, which not only realizes the connection between the mechanical characteristic sensor 24 and the extension shaft 21, but also solves the problem of the axis misalignment between the extension shaft 21 and the sensor motion acquisition end.

[0057] Furthermore, such as Figure 4 As shown, the mounting bracket 22 is L-shaped and includes a connecting part 221 and a mounting part 222. The connecting part 221 is provided with two vertically spaced connecting holes 223. The mounting part 222 is provided with a clearance hole 224 placed coaxially with the rotating shaft of the circuit breaker, and three mounting holes 225 placed around the clearance hole 224 for mounting the mechanical characteristic sensor 24.

[0058] Furthermore, such as Figure 4As shown, the connecting hole 223 is an elongated hole and is placed in the horizontal direction, which facilitates fine adjustment of the installation position of the mounting bracket 22 during installation.

[0059] Furthermore, the mounting bracket 22 is made of metal material, preferably aluminum alloy, and is integrally formed by punching and bending.

[0060] Furthermore, such as Figure 1 and 5 As shown, since the original mounting plate 13 of the Shunchi (CFPTA.120-40LB-FAR3) tank circuit breaker has only one reserved hole 14, the connecting assembly 23 includes a nut 232, a clamping plate 233, and two bolts 231. One bolt 231 passes through the connecting hole 223 of the mounting bracket 22 and the reserved hole 14 on the mounting plate 13 in sequence and is connected to the nut 232. The other bolt 231 passes through another connecting hole 223 of the mounting bracket 22 and is threadedly connected to the clamping plate 233, together fixing the mounting bracket 22 to the mounting plate 13.

[0061] Furthermore, such as Figure 6 As shown, one end of the clamping piece 233 is provided with a threaded hole 2331, and the other end is provided with anti-slip texture 2332, which can improve friction and increase locking force.

[0062] The installation steps for the mechanical property sensor are as follows:

[0063] 1. First, disconnect the circuit breaker from the power supply, then manually release the pre-stored mechanical energy of the circuit breaker. Next, remove the panel end cover and confirm the main installation location.

[0064] 2. Insert the M10 anti-loosening nut 213 into the threaded section 211 of the extension shaft 21, and then install the threaded section 211 onto the process hole 12 at the end of the circuit breaker extension shaft 21, and tighten the anti-loosening nut 213.

[0065] 3. Insert one end of the coupling 25 into the optical shaft section 212 of the extension shaft 21 and pre-tighten it (do not lock it, just enough to position it).

[0066] 4. Use M3 screws, M3 spring washers, and M3 flat washers to install the mechanical characteristic sensor onto the mounting part 222 of the mounting bracket 22, and tighten to a torque of 0.9-1 N.m.

[0067] 5. Insert the output shaft of the mechanical characteristic sensor into the shaft hole of the coupling; check whether there is any interference at the connection hole 223 of the mounting bracket. If there is no problem, please proceed to the next step of installation. If there is a problem, please repeat step 4 to make a fine adjustment of the position and then repeat the above operation.

[0068] 6. Using M10 screws, M10 widened flat washers, and M10 butterfly anti-loosening washers, and by using two bolts 231 in conjunction with nuts 232 and clamping plates 233, the mounting bracket 22 is fixedly installed onto the fixing plate 13 of the circuit breaker body.

[0069] Note: Rotate the coupling intermittently while it is fixed to ensure that the coupling can rotate smoothly and is in a state of natural stress after this step of installation is completed.

[0070] 7. Tighten the fastening screws of the mechanical property sensor end coupling; after tightening, rotate the coupling forward and backward more than 3 times before tightening the extension shaft 21 end coupling; finally, tighten with a torque wrench (0.9Nm).

[0071] Note: (1). The coupling must be able to slide back and forth easily and rotate in both directions easily before locking;

[0072] (2) The insertion depth of the shafts at both ends shall not exceed the depth of the main body of the coupling at both ends;

[0073] (3) After locking one end, be sure to rotate the coupling before locking the other end.

[0074] 8. Inspect the entire assembly to ensure no parts are missing or incorrectly installed; check the entire system after installation to determine if there are any adverse risks such as interference during the operation of the circuit breaker, based on the actual working conditions of the circuit breaker on site.

[0075] 10. After inspection, if there are no problems, apply thread-locking adhesive to the locking position of the coupling and other positions with a risk of loosening; Thread-locking adhesive requirements: breaking torque / average disassembly torque = 17 / 25 N.m or higher, temperature resistance -54℃ to 150℃, and UL certification.

[0076] Note: If there is a trial run after the entire system is installed on site, the glue application should be performed after the trial run is completed; the equipment after glue application can only be started and used after the specified curing time of the threadlocker has been exceeded.

[0077] 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. An on-line monitoring device for GIS combined electrical apparatus breaker characteristics, characterized by: The device comprises an extension shaft, a mounting bracket, a connecting assembly and a mechanical property sensor. One end of the extension shaft is connected with a process hole at the end of the rotating shaft of the circuit breaker. The mounting bracket is mounted on the fixed plate through the connecting assembly, and the fixed plate is located at one side of the end of the rotating shaft. The mechanical property sensor is mounted on the mounting bracket and connected with the other end of the extension shaft.

2. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 1, characterized in that: The extension shaft comprises threaded segments and optical axis segments which are connected with each other along the same axis, and a lock nut arranged on the threaded segment; the threaded segment is threadedly connected with the process hole at the end of the rotating shaft of the circuit breaker; and the lock nut abuts against the end of the rotating shaft of the circuit breaker.

3. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 2, characterized in that: The mechanical property sensor adopts a hollow shaft structure; the optical axis segment of the extension shaft extends into the hollow shaft and is fixed by a jackscrew.

4. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 2, characterized in that: The mechanical property sensor is provided with an output shaft which is connected with the optical axis segment of the extension shaft through a coupling.

5. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 4, characterized in that: The coupling adopts a double diaphragm coupling.

6. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 1, characterized in that: The mounting bracket is L-shaped and comprises a connecting part and a mounting part; at least two vertically spaced connecting holes are arranged on the connecting part; and an avoiding hole coaxially arranged with the rotating shaft of the circuit breaker and a plurality of mounting holes for mounting the mechanical property sensor are arranged around the avoiding hole on the mounting part.

7. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 6, characterized in that: The connecting hole is a long strip hole and is arranged in the horizontal direction.

8. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 6, characterized in that: The mounting bracket is integrally formed by punching and bending.

9. The on-line monitoring device of GIS combined electrical apparatus characteristics according to any one of claims 6-7, characterized in that: The connecting assembly comprises at least two bolts, corresponding nuts or clamping pieces; the bolts are threadedly connected with the nuts or clamping pieces through the connecting holes to fix the mounting bracket on the fixed plate.

10. The on-line monitoring device of GIS combined electrical apparatus characteristics according to claim 9, characterized in that: One end of the clamping piece is provided with a threaded hole, and the other end is provided with an anti-skid pattern.

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