Linear stroke on-line monitoring device and method for pole column type circuit breaker

Abstract

The application discloses a kind of linear stroke on-line monitoring device and method of pole type circuit breaker, it is related to circuit breaker field, the device includes mirror image rotating plate, stroke sensor device, lower fixed plate, wherein, mirror image rotating plate is fixedly connected with the linkage plate of circuit breaker rotating main shaft, mirror image rotating plate is slidably connected with stroke sensor device, mirror image rotating plate drives stroke sensor device to rotate, stroke sensor device is movably connected with lower fixed plate, and stroke sensor device is used to realize on-line detection function.The beneficial effects of the application are to realize direct monitoring of the linear stroke of the circuit breaker, the device is flexible in installation location, reduces the difficulty and cost of monitoring, without conversion and correction through conversion model, improves the accuracy and precision of monitoring.

Description

Technical Field

[0001] This invention relates to the field of circuit breakers, and more particularly to an online monitoring device and method for the linear travel of a pole-type circuit breaker. Background Technology

[0002] Solid-insulated pole circuit breakers are widely used in heavy-load, harsh-environment applications such as metallurgy, power generation, and coal mining due to their excellent insulation and arc-extinguishing performance. The mechanical characteristic parameters of solid-insulated pole circuit breakers accurately reflect the most critical parameters of the circuit breaker, such as its operating process, operating energy, and remaining life, and are the core content of online circuit breaker monitoring. A prerequisite for achieving online monitoring of the mechanical characteristics of circuit breakers is the real-time monitoring of the linear travel of the internal contacts during the opening and closing operations.

[0003] The travel distance of a solid-pole circuit breaker refers to the linear travel of the internal contact during opening and closing. The contact is sealed within a pole filled with SF6 gas and operates under high voltage, making direct measurement of the linear travel during opening and closing impossible. A common practice for online monitoring of the contact's linear travel is to install a linear displacement sensor on the insulating rod connecting the contact. However, this requires pre-installation of the sensor during circuit breaker manufacturing. Since both the insulating rod and the contact are sealed within the pole, the linear displacement sensor is irreparable if damaged. Furthermore, the high voltage emitted by the contact radiates a strong electromagnetic field, interfering with the sensor's output signal. Finally, the pole is a sealed gas chamber; transmitting sensor data from within requires a sealed connector, increasing cost, disrupting the existing pole structure, and creating a risk of gas leakage. Therefore, while theoretically feasible, this method has low reliability and applicability, making it suitable only for laboratory testing and unsuitable for practical product use.

[0004] Another common approach is to use an angular displacement sensor to monitor the main shaft of the circuit breaker, obtaining the angular travel of the circuit breaker's opening and closing actions. Then, through mathematical calculations, the angular travel data measured by the angular displacement sensor is converted into the linear travel data of the break point. However, the final linear movement of the circuit breaker break point is achieved through multiple circular-to-linear transmissions. The mathematical model that converts angles into linear motion cannot accurately match the actual situation of each circuit breaker, resulting in biased monitoring results. Corrections are needed for each circuit breaker, requiring simultaneous monitoring of both angular and linear travel. This process is extremely cumbersome, consumes significant manpower and resources, and is inefficient.

[0005] Meanwhile, there are no components outside the pole of the pole of the pole-type circuit breaker that have the same movement trajectory as the internal break point of the pole, so the linear travel of the circuit breaker cannot be directly measured by a travel sensor.

[0006] In view of this, the present invention aims to design an online monitoring device and method for the linear travel of a pole-type circuit breaker, so as to realize direct online monitoring of the linear travel of the circuit breaker. Summary of the Invention

[0007] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is how to achieve direct and accurate online monitoring of the linear travel of the circuit breaker outside the pole.

[0008] To achieve the above objectives, the present invention provides an online monitoring device for the linear travel of a pole-type circuit breaker, comprising a mirror rotating plate, a travel sensor device, and a lower fixed plate. The mirror rotating plate is fixedly connected to the linkage plate of the circuit breaker's rotating main shaft, and the mirror rotating plate is slidably connected to the travel sensor device. The mirror rotating plate drives the travel sensor device to rotate, and the travel sensor device is rotatably connected to the lower fixed plate. The travel sensor device is used to realize the online detection function.

[0009] Furthermore, the mirror rotating plate is provided with a rod-shaped transmission part, which is provided with an upper fulcrum through hole for connecting the stroke sensor device; the distance from the center of the upper fulcrum through hole to the center of the circuit breaker rotating spindle is the same as the length of the connecting rod inside the pole column.

[0010] Furthermore, the mirror rotating plate is provided with a clearance hole, which is a hollow circle and its circle is slightly larger than the protruding part of the circuit breaker rotating shaft to avoid interference during the installation of the mirror rotating plate; the center of the clearance hole coincides with the axis of the circuit breaker rotating main shaft.

[0011] Furthermore, the lower fixing plate has two fixing through holes in the vertical direction to connect the lower fixing plate and the circuit breaker isolation plate; the position of the fixing through holes coincides with the position of the through holes on the circuit breaker isolation plate; the lower fixing plate has a lower support through hole in the horizontal direction, which is used to connect with the travel sensor device. The lower fixing plate and the travel sensor device are connected by bolts and can rotate freely with the bolts as the axis.

[0012] Furthermore, the stroke sensor device includes a cover plate, a displacement sensor, a sensor base, and a stroke plate; the displacement sensor is used to sense the stroke of the stroke plate in real time, the displacement sensor is fixedly connected to the sensor base through the cover plate, and the stroke plate is slidably connected to the sensor base.

[0013] Furthermore, the sensor base includes several first fixing holes, and the cover plate includes several second fixing holes, with the first fixing holes and the second fixing holes coinciding in position; a sensor guide groove is provided at the bottom of the sensor base.

[0014] Furthermore, the travel plate has raised guide rails on both sides that match the sensor guide groove, allowing the sensor base to slide freely on the guide rails; the travel plate has a travel sensing strip in the center, and the displacement sensor can sense the travel of the travel plate in real time.

[0015] Furthermore, the sensor base is provided with a sensor fixing slot, and the displacement sensor is installed in the sensor fixing slot.

[0016] Furthermore, the travel sensor is used to sense the travel of the travel plate in real time; the travel sensor includes a sensor body and a control cable; the control cable includes a power cable and a data cable, which are connected to the data acquisition unit to realize power supply and data interaction.

[0017] A method for online monitoring of the linear travel of a pole-type circuit breaker includes the following steps:

[0018] Step 1: Install an online monitoring device on the pole-type circuit breaker: The online monitoring device includes a mirror rotating plate, a travel sensor device, and a lower fixed plate. The mirror rotating plate is fixedly connected to the linkage plate of the circuit breaker's rotating main shaft, and the lower fixed plate is fixedly connected to the circuit breaker's isolation plate. The travel sensor device is used to sense travel data in real time.

[0019] Step 2: Obtain the travel data during the opening and closing of the circuit breaker: The main shaft of the circuit breaker drives the connecting rod and the mirror rotating plate inside the pole to rotate simultaneously. The two have the same rotation radius and the same rotation angle, but opposite rotation directions. Their travel is mirror image; the mirror rotating plate drives the travel sensor device to rotate together.

[0020] Step 3: Obtain linear travel data: Take the vertical component of the travel data obtained in Step 2, which is the linear motion travel data of the circuit breaker contact, thereby realizing online monitoring of the linear travel of the circuit breaker.

[0021] Compared with existing technical solutions, the beneficial effects of the present invention are: it realizes direct monitoring of the linear travel of the circuit breaker without the need to pre-install sensors inside the circuit breaker; the device has flexible installation location, reducing the difficulty and cost of monitoring; and it does not require conversion and correction through conversion models, thus improving the accuracy and precision of online monitoring.

[0022] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the online monitoring device for the linear travel of a pole-type circuit breaker according to a preferred embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the installation of an online monitoring device for the linear travel of a pole-type circuit breaker according to a preferred embodiment of the present invention;

[0025] Figure 3This is a schematic diagram of the mirror rotating plate structure of an online monitoring device according to a preferred embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the lower fixing plate structure of an online monitoring device according to a preferred embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the stroke plate structure of an online monitoring device according to a preferred embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the stroke sensor structure of an online monitoring device according to a preferred embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the sensor base structure of an online monitoring device according to a preferred embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the cover plate structure of an online monitoring device according to a preferred embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the stroke sensor device structure of an online monitoring device according to a preferred embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the principle of online monitoring of linear travel according to a preferred embodiment of the present invention;

[0033] Among them, 1-circuit breaker, 2-mirror rotating plate, 3-stroke sensing device, 4-lower fixed plate, 5-upper fulcrum through hole, 6-avoidance hole, 7-fixed through hole, 8-lower fulcrum through hole, 9-first fixed hole, 10-sensor guide groove, 11-second fixed hole, 12-sensor fixing groove, 13-upper fulcrum fixing hole, 14-guide rail, 15-stroke sensing strip, 16-lower fulcrum fixing hole, 17-control cable, 18-sensor body. Detailed Implementation

[0034] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0035] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0036] like Figure 1-2As shown, the online monitoring device includes a mirror rotating plate 2, a travel sensor device 3, and a lower fixed plate 4. The mirror rotating plate 2 is fixedly connected to the linkage plate of the main rotating shaft of the circuit breaker 1, and the mirror rotating plate 2 is slidably connected to the travel sensor device 3. The mirror rotating plate 2 drives the travel sensor device 3 to rotate, and the travel sensor device 3 is rotatably connected to the lower fixed plate 4. The travel sensor device 3 is used to realize the online detection function. During the opening and closing process, the main rotating shaft of the circuit breaker 1 rotates, simultaneously driving the connecting rod inside the pole and the mirror rotating plate 2 to rotate.

[0037] like Figure 3 As shown, the mirror rotating plate 2 has a rod-shaped transmission part with an upper fulcrum through hole 5 for connecting a stroke sensor device. The distance from the center of the upper fulcrum through hole 5 to the axis of the circuit breaker's rotating main shaft is the same as the length of the connecting rod inside the pole post. The mirror rotating plate 2 has a clearance hole 6, which is a hollow circle slightly larger than the protruding part of the circuit breaker 1's rotating shaft to avoid interference during installation. The center of the clearance hole 6 coincides with the axis of the circuit breaker 1's rotating main shaft. The mirror rotating plate 2 has three mounting through holes, the positions of which are the same as the through holes on the circuit breaker 1's main shaft linkage plate. The mirror rotating plate 2 is fixed to the circuit breaker 1's main shaft linkage plate with screws.

[0038] like Figure 4 As shown, the lower fixing plate 4 has two fixing through holes 7 in the vertical direction to connect the lower fixing plate 4 and the circuit breaker 1 isolation plate; the positions of the fixing through holes 7 coincide with the positions of the through holes on the circuit breaker 1 isolation plate; the lower fixing plate 4 has a lower fulcrum through hole 8 in the horizontal direction, which is used to connect with the travel sensor device. The lower fixing plate 4 and the travel sensor device 3 are connected by bolts and can rotate freely with the bolts as the axis. In a preferred embodiment, the lower fixing plate 4 is a metal folded plate; the lower fulcrum through hole 8 and the lower fulcrum through hole 8 are connected with the circuit breaker 1 isolation plate. Figure 5 The lower fulcrum fixing hole 15 on the travel plate shown is connected by bolts. During installation, the two are softly connected and cannot be locked. They can rotate freely around the bolt as an axis because the travel plate needs to rotate freely within a certain angle during the opening and closing process.

[0039] like Figure 6 As shown, the stroke sensor device includes a cover plate, a displacement sensor, a sensor base, and a stroke plate; the displacement sensor is used to sense the stroke of the stroke plate in real time, the displacement sensor is fixedly connected to the sensor base through the cover plate, and the stroke plate is slidably connected to the sensor base.

[0040] like Figure 7-9As shown, the sensor base includes several first fixing holes 9, and the cover plate includes several second fixing holes 11, with the first fixing holes 9 and the second fixing holes 11 coinciding in position. A sensor guide groove 10 is provided at the bottom of the sensor base. The sensor base has a sensor fixing groove 12, in which the displacement sensor is installed. The sensor base includes four fixing holes, which coincide with the four fixing holes on the cover plate. The size of the sensor fixing groove 12 is designed according to the travel sensor body 18; the sensor fixing groove 12 is slightly larger than the sensor body 18 to ensure that the sensor body 18 can be installed into the sensor fixing groove 12. Figure 5 As shown, in a preferred embodiment, the travel plate is a long strip of metal plate with raised guide rails 14 on both sides, matching the sensor guide groove 10. The sensor base can slide freely on the guide rails 14. A travel sensing strip 15 is provided in the center of the travel plate, and the displacement sensor can sense the travel of the travel plate in real time. A lower support fixing hole 16 is provided below the travel plate, which is a circular through hole. This through hole and the lower support through hole 8 on the lower fixing plate are installed together by bolts. The two are not completely fixed and can rotate freely. The travel sensor is used to sense the travel of the travel plate in real time. The travel sensor includes a sensor body 18 and a control cable 17. The travel sensor body 18 is square, and the sensing circuit is sealed inside the travel sensor body 18. The control cable 17 includes a power line and a data line, which are connected to the data acquisition unit to realize power supply and data interaction. The cover plate has four fixing holes, which match the fixing holes of the sensor base; the cover plate has an upper fulcrum fixing hole 13 in the middle; the upper fulcrum fixing hole 13 and the upper fulcrum through hole 5 of the mirror rotating plate are flexibly connected by bolts, and the two can rotate freely between each other.

[0041] The connecting rod is the internal component of the pole post that connects the rotating shaft and the crank structure. The crank structure converts the circular motion of the connecting rod into linear motion in the vertical direction. The insulating rod insulates the shaft and transmits the linear motion of the crank to the fracture surface, causing it to move vertically. The length of the connecting rod in the mirror-rotating component is the same as the length of the connecting rod inside the pole post, meaning they have the same radius of rotation and the same rotation trajectory (equal in magnitude, opposite in direction). The vertical component of the displacement of the internal connecting rod (the crank structure converts the circular motion into linear motion) is the displacement of the fracture surface. The trajectory of the connecting rod in the external mirror-rotating component is the same as that of the internal connecting rod. Taking the vertical component of the displacement of the mirror-rotating component gives the displacement of the fracture surface. The method for taking the vertical component of the displacement of the mirror-rotating component is as follows:

[0042] like Figure 10 As shown, O is the axis of rotation;

[0043] A is the lower fixed point of the linear displacement sensor;

[0044] P is the upper fulcrum of the linear displacement sensor, which moves on an arc with O as the center and R as the radius.

[0045] Draw a line perpendicular to the Y-axis from point P, and let H be the point where it intersects line AC; AH is the vertical component of AP, which is the straight-line travel of the fracture at any given time.

[0046] B is the closing stop position;

[0047] C is the tripping stop position;

[0048] Points A, B, C, and H lie on the same straight line, which is parallel to the Y-axis.

[0049] The distance from points A, B, and C to the Y-axis (the perpendicular line passing through the center of the rotation axis) is L1; this distance is used to determine the position of the lower support point.

[0050] Based on the above analysis, the distance AH is the straight-line travel of the fracture at any given moment.

[0051] The method for calculating AH is as follows:

[0052] Figure 10 In the diagram, the positions of points O and A are fixed, meaning the distance of OA is known. Point P is constantly moving, and the distance of AP is the movement distance of the linear displacement sensor. The real-time length of AP can be obtained through sampling, and this is also a known value. PH⊥AC, meaning △APH is a right triangle, therefore: AH=AP*sin(∠HAP);

[0053] And ∠HAP=∠OAP-∠OAB;

[0054] That is, AH = AP * sin(∠OAP - ∠OAB);

[0055] According to the Law of Cosines, cos(∠OAP)=(OA²+AP²-OP²) / (2*OA*AP);

[0056] Let OA be a known fixed value, AP be the measured value from a linear displacement sensor, and OP be R.

[0057] ∠OAP=arc(cos((OA2+AP2-R 2 ) / (2*OA*AP)));

[0058] Similarly, ∠OAB=arc(cos((OA2+AB2-R)) 2 ) / (2*OA*AB)));

[0059] Substituting the obtained result into the equation, we can obtain the value of AH, which is the displacement of the break at any given time, i.e., the real-time linear travel of the circuit breaker.

[0060] In use, an online monitoring device is installed on the pole-type circuit breaker: the online monitoring device includes a mirror rotating plate, a travel sensor device, and a lower fixed plate. The mirror rotating plate is fixedly connected to the linkage plate of the circuit breaker's rotating main shaft, and the lower fixed plate is fixedly connected to the circuit breaker's isolation plate. The travel sensor device is used to sense travel data in real time; to obtain travel data when the circuit breaker operates to open or close: the circuit breaker's main shaft drives the connecting rod inside the pole and the mirror rotating plate to rotate simultaneously. The two have the same rotation radius and the same rotation angle, but opposite rotation directions, and their travel is mirror image; the mirror rotating plate drives the travel sensor device to rotate together; to obtain linear travel data: the vertical component of the obtained travel data is taken, which is the linear motion travel data of the circuit breaker's break point, thereby realizing online monitoring of the circuit breaker's linear travel.

[0061] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A linear stroke on-line monitoring device for a pole-mounted circuit breaker, characterized by, The device includes a mirror rotating plate, a stroke sensor device, and a lower fixed plate. The mirror rotating plate is fixedly connected to the linkage plate of the circuit breaker rotating main shaft. The mirror rotating plate is slidably connected to the stroke sensor device. The mirror rotating plate drives the stroke sensor device to rotate. The stroke sensor device is rotatably connected to the lower fixed plate. The stroke sensor device is used to realize online detection function. The mirror rotating plate is provided with a rod-shaped transmission part, and the rod-shaped transmission part is provided with an upper fulcrum through hole. The upper fulcrum through hole is used to connect a stroke sensor device. The distance from the center of the upper fulcrum through hole to the center of the rotating spindle of the circuit breaker is the same as the length of the connecting rod inside the pole column.

2. The online monitoring device for the linear travel of a pole-type circuit breaker as described in claim 1, characterized in that, The mirror rotating plate is provided with a clearance hole, which is a hollow circle and its circle is slightly larger than the protruding part of the circuit breaker rotating shaft to avoid interference during the installation of the mirror rotating plate; the center of the clearance hole coincides with the axis of the circuit breaker rotating main shaft.

3. The linear travel on-line monitoring device of a pole column type circuit breaker according to claim 1, characterized in that, The lower fixing plate has two fixing through holes in the vertical direction for connecting the lower fixing plate and the circuit breaker isolation plate; the position of the fixing through holes coincides with the position of the through holes on the circuit breaker isolation plate; the lower fixing plate has a lower support through hole in the horizontal direction for connecting to the travel sensor device; the lower fixing plate and the travel sensor device are connected by bolts and can rotate freely with the bolts as the axis.

4. The linear travel on-line monitoring device of a pole column type circuit breaker according to claim 1, characterized in that, The stroke sensor device includes a cover plate, a displacement sensor, a sensor base, and a stroke plate; the displacement sensor is used to sense the stroke of the stroke plate in real time, the displacement sensor is fixedly connected to the sensor base through the cover plate, and the stroke plate is slidably connected to the sensor base.

5. The linear travel on-line monitoring device of a pole column type circuit breaker according to claim 4, characterized in that, The sensor base includes several first fixing holes, and the cover plate includes several second fixing holes, with the first fixing holes and the second fixing holes coinciding in position; the bottom of the sensor base is provided with a sensor guide groove.

6. The linear travel on-line monitoring device of a pole column type circuit breaker according to claim 5, wherein The travel plate has raised guide rails on both sides that match the sensor guide groove, and the sensor base can slide freely on the guide rails; the travel plate has a travel sensing strip in the center, and the displacement sensor can sense the travel of the travel plate in real time.

7. The linear travel on-line monitoring device of a pole column type circuit breaker according to claim 4, wherein The sensor base is provided with a sensor fixing slot, and the displacement sensor is installed in the sensor fixing slot.

8. The linear travel on-line monitoring device of a pole column type circuit breaker according to claim 4, wherein The stroke sensor is used to sense the stroke of the stroke plate in real time; the stroke sensor includes a sensor body and a control cable; the control cable includes a power line and a data line, which are connected to the data acquisition unit to realize power supply and data interaction.

9. A linear stroke on-line monitoring method of a pole column type circuit breaker, characterized by, The method includes the following steps: Step 1: Install an online monitoring device on the pole-type circuit breaker: The online monitoring device includes a mirror rotating plate, a travel sensor device, and a lower fixed plate. The mirror rotating plate is fixedly connected to the linkage plate of the circuit breaker's rotating main shaft, and the lower fixed plate is fixedly connected to the circuit breaker's isolation plate. The travel sensor device is used to sense travel data in real time. Step 2: Obtain travel data during the opening and closing of the circuit breaker: The main shaft of the circuit breaker drives the connecting rod inside the pole and the mirror rotating plate to rotate simultaneously. The two have the same rotation radius and the same rotation angle, but opposite rotation directions, and their travel is mirror image; the mirror rotating plate drives the travel sensor device to rotate together. Step 3: Obtain linear travel data: Take the vertical component of the travel data obtained in Step 2, which is the linear motion travel data of the circuit breaker contact, thereby realizing online monitoring of the linear travel of the circuit breaker.

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