A circuit breaker pressure monitoring device and method

Abstract

The application discloses a kind of circuit breaker pressure monitoring device and method, including pressure transmission component, stress analysis component and pressure spring;Pressure transmission component includes support frame, runner and crank connecting rod;One end of pressure spring is set on support frame, the other end of pressure spring is used to abut with the top end of circuit breaker operating lever, runner rotation is set on support frame, crank connecting rod is parallel with runner, one end of crank connecting rod is hinged on the position of adjacent edge of the rotary face of runner, the other end of crank connecting rod is used to hinge the bottom end of circuit breaker operating lever;Stress analysis component includes anisotropic structure strain sensor and stress analysis device;Anisotropic structure strain sensor is set on the side surface of crank connecting rod, and stress analysis device is electrically connected with anisotropic structure strain sensor;The application monitors the pressure condition suffered by circuit breaker in real time, improves operation and maintenance efficiency.

Description

Technical Field

[0001] This invention relates to the field of electrical component testing technology, and in particular to a circuit breaker pressure monitoring device and method. Background Technology

[0002] Circuit breakers control the conduction and flow of current by opening or closing circuits, thereby protecting electrical equipment and the safety of operators. SF6 circuit breakers, due to their excellent arc-extinguishing and insulation properties, are commonly used for ultra-high voltage circuit protection, and their condition directly affects the safety of the entire local power grid.

[0003] Currently, SF6 circuit breakers have problems such as limited measurement space and unclear pressure conditions during operation, which makes it difficult to assess the safety status of power equipment and results in low operation and maintenance efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a circuit breaker pressure monitoring device and method, which can conveniently monitor the pressure status of circuit breakers and improve operation and maintenance efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A circuit breaker pressure monitoring device includes a pressure transmission assembly, a stress analysis assembly, and a compression spring for being sleeved on the circuit breaker operating rod.

[0007] The pressure transmission assembly includes a support frame, a rotating wheel, and a crank connecting rod;

[0008] One end of the compression spring is disposed on the support frame, and the other end of the compression spring is used to abut against the top end of the circuit breaker operating rod. The rotating wheel is rotatably disposed on the support frame. The crank connecting rod is parallel to the rotating wheel. One end of the crank connecting rod is hinged to the rotating surface of the rotating wheel near the edge, and the other end of the crank connecting rod is used to hinge to the bottom end of the circuit breaker operating rod.

[0009] The stress analysis component includes anisotropic structural strain sensors and a stress analysis device;

[0010] The anisotropic structural strain sensor is disposed on the side surface of the crank connecting rod, and the stress analysis device is electrically connected to the anisotropic structural strain sensor.

[0011] The stress analysis device is used to obtain and determine the magnitude and direction of the pressure on the circuit breaker based on the strain parameters of the anisotropic structural strain sensor and the deformation parameters of the circuit breaker spring.

[0012] To solve the above-mentioned technical problems, the present invention adopts another technical solution as follows:

[0013] A circuit breaker pressure monitoring method, applied to the aforementioned circuit breaker pressure monitoring device, includes the following steps:

[0014] S1. Install the pressure transmission assembly on the circuit breaker operating rod;

[0015] S2. Obtain and determine the direction of pressure on the circuit breaker operating rod based on the strain parameters of the anisotropic structure strain sensor.

[0016] S3. Obtain and determine the magnitude of the pressure on the circuit breaker operating rod based on the deformation parameters of the compressed spring.

[0017] The beneficial effects of this invention are as follows: It provides a circuit breaker pressure monitoring device and method, in which a compression spring and a pressure transmission assembly are provided on the circuit breaker operating rod. When the circuit breaker operating rod is subjected to external pressure, the pressure is converted into the elastic deformation of the compression spring and the stress of the anisotropic structural strain sensor acting on the crank connecting rod. Then, by using the strain parameters of the anisotropic structural strain sensor and the deformation parameters of the circuit breaker spring, the magnitude and direction of the pressure on the circuit breaker are obtained. The device is easy to operate, does not affect the inherent action of the circuit breaker operating rod, monitors the pressure status of the circuit breaker in real time, and improves operation and maintenance efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the composition structure of a circuit breaker pressure monitoring device according to the present invention;

[0019] Figure 2 This is a schematic diagram of the composition of the pressure transmission assembly of a circuit breaker pressure monitoring device according to the present invention.

[0020] Figure 3 This is a schematic diagram of the anisotropic strain sensor structure of the pressure transmission assembly of a circuit breaker pressure monitoring device according to the present invention.

[0021] Figure 4 This is a schematic diagram illustrating the steps of a circuit breaker pressure monitoring method according to the present invention.

[0022] Label Explanation:

[0023] 1. Compression spring; 2. Pressure transmission assembly; 3. Strain sensor with irregular structure;

[0024] 101. Circuit breaker operating lever; 102. Top;

[0025] 201. Crank and connecting rod; 202. Wheel; 203. Support frame;

[0026] 301, Substrate layer; 302, Encapsulation layer; 303, Sensor array. Detailed Implementation

[0027] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0028] Please refer to Figures 1 to 3 A circuit breaker pressure monitoring device includes a pressure transmission assembly 2, a stress analysis assembly, and a compression spring 1 for being sleeved on the circuit breaker operating rod 101.

[0029] The pressure transmission assembly 2 includes a support frame 203, a rotating wheel 202, and a crank connecting rod 201;

[0030] One end of the compression spring 1 is mounted on the support frame 203, and the other end of the compression spring 1 is used to abut against the top end 102 of the circuit breaker operating lever 101. The rotating wheel 202 is rotatably mounted on the support frame 203. The crank connecting rod 201 is parallel to the rotating wheel 202. One end of the crank connecting rod 201 is hinged to the position near the edge of the rotating surface of the rotating wheel 202, and the other end of the crank connecting rod 201 is used to hinge to the bottom end of the circuit breaker operating lever 101.

[0031] The stress analysis component includes an anisotropic structural strain sensor 3 and a stress analysis device;

[0032] An anisotropic structural strain sensor 3 is disposed on the side surface of the crank connecting rod 201, and the stress analysis device is electrically connected to the anisotropic structural strain sensor 3.

[0033] The stress analysis device is used to obtain and determine the magnitude and direction of the pressure on the circuit breaker based on the strain parameters of the anisotropic structure strain sensor 3 and the deformation parameters of the circuit breaker spring.

[0034] As can be seen from the above description, the beneficial effects of the present invention are as follows: It provides a circuit breaker pressure monitoring device, which is equipped with a compression spring 1 and a pressure transmission assembly 2 on the circuit breaker operating lever 101. When the circuit breaker operating lever 101 is subjected to external pressure, it is converted into the elastic deformation of the compression spring 1 and the stress of the anisotropic strain sensor 3 acting on the crank connecting rod 201. Then, by using the strain parameters of the anisotropic strain sensor 3 and the deformation parameters of the circuit breaker spring, the magnitude and direction of the pressure on the circuit breaker are obtained. The device is easy to operate, does not affect the inherent action of the circuit breaker operating lever 101, monitors the pressure status of the circuit breaker in real time, and improves the operation and maintenance efficiency.

[0035] Furthermore, the anisotropic strain sensor 3 includes a substrate layer 301, an encapsulation layer 302, and a sensing array 303;

[0036] The induction array 303 is formed by two sets of strip strain resistors with different extension directions being interlaced on the same plane;

[0037] The sensing array 303 is disposed on the substrate layer 301, and the encapsulation layer 302 is disposed on the sensing array 303;

[0038] The stress analysis device is connected to the induction array 303.

[0039] As can be seen from the above description, the anisotropic strain sensor 3 specifically uses interlocked strip strain resistors with different extension directions to sense stress. The stability of the sensing array 303 is ensured by setting the encapsulation layer 302, and the base layer 301 is set to provide a mounting foundation while ensuring that the sensing is sufficiently sensitive and accurate.

[0040] Furthermore, the sensing array 303 includes a first strip strain gauge and a second strip strain gauge that are perpendicular to each other.

[0041] The first strain gauge consists of at least two parallel strain gauges; the second strain gauge consists of at least two parallel strain gauges.

[0042] The stress analysis device is connected to both ends of the first strip strain gauge and both ends of the second strip strain gauge.

[0043] Furthermore, the stress analysis device includes a sampling circuit, a control unit, and a wireless transmission unit;

[0044] The control unit is electrically connected to the induction array 303 through the sampling circuit, the control unit is electrically connected to the wireless transmission unit, and the wireless transmission unit is communicatively connected to the monitoring terminal.

[0045] As described above, the stress analysis device mainly consists of a front-end sampling circuit and a back-end control unit. The control unit analyzes and processes the collected data and is equipped with wireless transmission capability, which can remotely feed back the monitoring results to the monitoring terminal, improving the real-time performance and convenience of operation and maintenance.

[0046] Furthermore, the width of the first strip strain gauge is 6-10 mm, and the width of the second strip strain gauge is 2-5 mm.

[0047] Furthermore, the anisotropic strain sensor 3 is attached to the crank connecting rod 201 by elastic tape.

[0048] As can be seen from the above description, using elastic tape to fix the anisotropic strain sensor 3 ensures that the anisotropic strain sensor 3 fits sufficiently with the surface of the crank connecting rod 201, thereby improving the accuracy of sensing.

[0049] Please refer to Figure 4 A circuit breaker pressure monitoring method, applied to the aforementioned circuit breaker pressure monitoring device, includes the following steps:

[0050] S1. Install the pressure transmission assembly 2 on the circuit breaker operating rod 101;

[0051] S2. Obtain and determine the direction of pressure on the circuit breaker operating rod 101 based on the strain parameters of the anisotropic structure strain sensor 3.

[0052] S3. Obtain and determine the magnitude of the pressure on the circuit breaker operating rod 101 based on the deformation parameters of the compression spring 1.

[0053] As can be seen from the above description, the beneficial effects of the present invention are as follows: It provides a circuit breaker pressure monitoring method, in which a compression spring 1 and a pressure transmission assembly 2 are provided on the circuit breaker operating rod 101. When the circuit breaker operating rod 101 is subjected to external pressure, it is converted into the elastic deformation of the compression spring 1 and the stress of the anisotropic strain sensor 3 acting on the crank connecting rod 201. Then, by using the strain parameters of the anisotropic strain sensor 3 and the deformation parameters of the circuit breaker spring, the magnitude and direction of the pressure on the circuit breaker are obtained. The device is easy to operate, does not affect the inherent action of the circuit breaker operating rod 101, monitors the pressure status of the circuit breaker in real time, and improves operation and maintenance efficiency.

[0054] Furthermore, step S2 specifically includes:

[0055] S21. Obtain and based on the initial resistance and transient resistance values ​​of the bar strain gauges in two different directions, as well as the initial deformation and transient deformation of the anisotropic strain sensor 3, obtain the specification factor of the bar strain gauge for each direction, the expression of which is as follows:

[0056]

[0057] Wherein, GF represents the specification factor, and R, R0, L, L0 are the transient resistance value, the initial resistance value, the initial deformation of the anisotropic strain sensor 3, and the transient deformation, respectively.

[0058] S22. Compare and select the extension direction of the bar strain gauge with the larger specification factor as the direction of the pressure on the circuit breaker operating rod 101.

[0059] As can be seen from the above description, by exploring the influence of the stress generated by the pressure on the anisotropic structure strain sensor 3, the direction of the pressure on the circuit breaker operating rod 101 can be investigated. The conversion process can reduce the limitation of the space around the circuit breaker on the monitoring, and solve the problem of small measurement space when monitoring the pressure of the circuit breaker.

[0060] Furthermore, step S3 specifically includes:

[0061] S31. Obtain the elastic modulus of the compression spring 1, the length of the crank connecting rod 201, the axial strain of the anisotropic strain sensor 3, the initial deformation, and the transient deformation to determine the magnitude of the pressure on the circuit breaker operating rod 101. Its expression is:

[0062]

[0063] Wherein, F1, F2, E, r, and Δε are the pressure on the circuit breaker operating rod 101, the elastic force of the compression spring 1, the elastic modulus of the compression spring 1, the length of the crank connecting rod 201, and the axial strain of the anisotropic strain sensor 3, respectively.

[0064] As can be seen from the above description, by setting a compression spring 1 to represent the pressure on the circuit breaker operating rod 101 equally, the difficulty of directly detecting the force on the circuit breaker operating rod 101 can be avoided, and the magnitude of the pressure on the circuit breaker operating rod 101 can be cleverly calculated.

[0065] Please refer to Figures 1 to 3 Embodiment 1 of the present invention is as follows:

[0066] A circuit breaker pressure monitoring device includes a pressure transmission assembly 2, a stress analysis assembly, and a compression spring 1 for being sleeved on a circuit breaker operating rod 101. The pressure transmission assembly 2 includes a support frame 203, a rotating wheel 202, and a crank connecting rod 201. One end of the compression spring 1 is fastened to the support frame 203 by bolts, and the other end of the compression spring 1 is used to abut against the top end 102 of the circuit breaker operating rod 101. The stress analysis assembly includes an anisotropic strain sensor 3 and a stress analysis device.

[0067] It is worth noting that some existing circuit breaker operating levers 101 are equipped with a return spring in order to achieve automatic reset, etc. When the circuit breaker operating lever 101 is pressed down by an external force, the return spring is compressed accordingly. In this case, the compressed spring 1 in this embodiment is the return spring.

[0068] The rotating wheel 202 is rotatably mounted on the support frame 203. The crank connecting rod 201 is parallel to the rotating wheel 202. One end of the crank connecting rod 201 is hinged to the edge of the rotating surface of the rotating wheel 202, and the other end of the crank connecting rod 201 is used to hinge to the bottom end of the circuit breaker operating lever 101. Figure 1 As can be seen, when the circuit breaker operating lever 101 is pressed down by an external force, the upper end of the crank connecting rod 201 is subjected to pressure, which causes the wheel 202 to rotate, causing the position where the crank connecting rod 201 and the wheel 202 are connected to move downward; at the same time, the pressure generates stress on the crank connecting rod 201 that acts on the anisotropic strain sensor 3, thereby causing the anisotropic strain sensor 3 to deform.

[0069] An anisotropic structural strain sensor 3 is disposed on the side surface of the crank connecting rod 201, and the stress analysis device is electrically connected to the anisotropic structural strain sensor 3. The stress analysis device is used to obtain and, based on the strain parameters of the anisotropic structural strain sensor 3 and the deformation parameters of the circuit breaker spring, to obtain the magnitude and direction of the pressure on the circuit breaker.

[0070] In this embodiment, the anisotropic strain sensor 3 includes a substrate layer 301, an encapsulation layer 302, and a sensing array 303; the sensing array 303 is formed by two sets of strip strain resistors with different extension directions interleaved on the same plane; specifically as follows... Figure 1 and Figure 3 As shown, the induction array 303 includes a first strip strain resistor (X-axis) and a second strip strain resistor (Y-axis) that are perpendicular to each other; there are at least two first strip strain resistors that are parallel to each other, and there are at least two second strip strain resistors that are parallel to each other; the stress analysis device is connected to both ends of the first strip strain resistor and both ends of the second strip strain resistor respectively.

[0071] Reference Figure 3 As shown, the first strip strain gauge (X-axis) and the second strip strain gauge (Y-axis) are in the horizontal and vertical directions, respectively, and the two are combined to form a 6×4 asymmetric induction array 303. The width of the first strip strain gauge is 6-10mm, preferably 8mm; the width of the second strip strain gauge is 2-5mm, preferably 4mm.

[0072] The induction array 303 is disposed on the substrate layer 301. The substrate layer 301 is generally composed of a flexible polymer, such as [specific example not provided]. The encapsulation layer 302 is adhered to and covers the induction array 303, providing protection and ensuring the stable operation of the induction array 303. The stress analysis device is connected to the induction array 303.

[0073] In this embodiment, the stress analysis device includes a sampling circuit, a control unit, and a wireless transmission unit; the control unit is electrically connected to the induction array 303 through the sampling circuit, the control unit is electrically connected to the wireless transmission unit, and the wireless transmission unit is communicatively connected to the monitoring terminal.

[0074] Please refer to Figure 4 Embodiment two of the present invention is as follows:

[0075] A circuit breaker pressure monitoring method, applied to a circuit breaker pressure monitoring device according to Embodiment 1, includes the following steps:

[0076] S1. Install the pressure transmission assembly 2 on the circuit breaker operating rod 101;

[0077] S2. Obtain and determine the direction of pressure on the circuit breaker operating rod 101 based on the strain parameters of the anisotropic structure strain sensor 3.

[0078] In this embodiment, step S2 specifically includes:

[0079] S21. Obtain and, based on the initial resistance values ​​and transient resistance values ​​of the strip strain resistors in two different directions, as well as the initial deformation and transient deformation of the anisotropic strain sensor 3, obtain the specification factor of the strip strain resistor corresponding to each direction, the expression of which is as follows:

[0080]

[0081] Wherein, GF represents the specification factor, and R, R0, L, L0 are the transient resistance value, the initial resistance value, the initial deformation of the anisotropic strain sensor 3, and the transient deformation, respectively.

[0082] In this embodiment, the expression for the specification factor is obtained by combining equations (2)-(4):

[0083]

[0084]

[0085]

[0086] S22. Compare and select the extension direction of the strip strain gauge with the larger specification factor as the pressure direction of the circuit breaker operating rod 101.

[0087] S3. Obtain and determine the magnitude of the pressure on the circuit breaker operating rod 101 based on the deformation parameters of the compression spring 1.

[0088] In this embodiment, step S3 specifically includes:

[0089] S31. Obtain the elastic modulus of the compression spring 1, the length of the crank connecting rod 201, the axial strain of the anisotropic strain sensor 3, the initial deformation, and the transient deformation to determine the magnitude of the pressure on the circuit breaker operating rod 101. Its expression is:

[0090]

[0091] Wherein, F1, F2, E, r, and Δε are the pressure on the circuit breaker operating rod 101, the elastic force of the compression spring 1, the elastic modulus of the compression spring 1, the length of the crank connecting rod 201, and the axial strain of the anisotropic strain sensor 3, respectively.

[0092] In this embodiment, equation (5) is obtained by combining equations (6)-(9).

[0093] F1 = F2 (6)

[0094]

[0095]

[0096] A=πr 2 (9)

[0097] In summary, the present invention provides a circuit breaker pressure monitoring device and method. A compression spring and a pressure transmission assembly are installed on the circuit breaker operating rod. When the circuit breaker operating rod is subjected to external pressure, it is converted into elastic deformation of the compression spring and stress acting on an anisotropic strain sensor on the crank connecting rod. Then, by using the strain parameters of the anisotropic strain sensor and the deformation parameters of the circuit breaker spring, the magnitude and direction of the pressure on the circuit breaker are obtained. The device is easy to operate, does not affect the inherent movement of the circuit breaker operating rod, monitors the pressure status of the circuit breaker in real time, and improves operation and maintenance efficiency.

[0098] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A circuit breaker pressure monitoring device, characterized in that, Includes a pressure transmission assembly, a stress analysis assembly, and a compression spring for mounting on the circuit breaker operating rod; The pressure transmission assembly includes a support frame, a rotating wheel, and a crank connecting rod; One end of the compression spring is disposed on the support frame, and the other end of the compression spring is used to abut against the top end of the circuit breaker operating rod. The rotating wheel is rotatably disposed on the support frame. The crank connecting rod is parallel to the rotating wheel. One end of the crank connecting rod is hinged to the rotating surface of the rotating wheel near the edge, and the other end of the crank connecting rod is used to hinge to the bottom end of the circuit breaker operating rod. The stress analysis component includes anisotropic structural strain sensors and a stress analysis device; The anisotropic structural strain sensor is disposed on the side surface of the crank connecting rod, and the stress analysis device is electrically connected to the anisotropic structural strain sensor. The stress analysis device is used to acquire and determine the magnitude and direction of the pressure on the circuit breaker based on the strain parameters of the anisotropic structure strain sensor and the deformation parameters of the compressed spring. The anisotropic strain sensor includes a substrate layer, an encapsulation layer, and a sensing array; the sensing array is formed by two sets of strip strain resistors with different extension directions being staggered on the same plane; the sensing array is disposed on the substrate layer, and the encapsulation layer is disposed on the sensing array; The stress analysis device is connected to the induction array.

2. The circuit breaker pressure monitoring device according to claim 1, characterized in that, The sensing array includes a first strip strain gauge and a second strip strain gauge that are perpendicular to each other. The first strip strain gauge consists of at least two strips, and the first strip strain gauges are parallel to each other; the second strip strain gauge consists of at least two strips, and the second strip strain gauges are parallel to each other. The stress analysis device is connected to both ends of the first strip strain gauge and both ends of the second strip strain gauge.

3. The circuit breaker pressure monitoring device according to claim 1, characterized in that, The stress analysis device includes a sampling circuit, a control unit, and a wireless transmission unit; The control unit is electrically connected to the induction array through the sampling circuit, the control unit is electrically connected to the wireless transmission unit, and the wireless transmission unit is communicatively connected to the monitoring terminal.

4. The circuit breaker pressure monitoring device according to claim 2, characterized in that, The width of the first strip strain gauge is 6-10 mm, and the width of the second strip strain gauge is 2-5 mm.

5. The circuit breaker pressure monitoring device according to claim 1, characterized in that, The anisotropic strain sensor is attached to the crank connecting rod with elastic tape.

6. A method for monitoring circuit breaker pressure, applied to a circuit breaker pressure monitoring device according to any one of claims 1-5, characterized in that, Including the following steps: S1. Install the pressure transmission assembly on the circuit breaker operating rod; S2. Obtain and determine the direction of pressure on the circuit breaker operating rod based on the strain parameters of the anisotropic structure strain sensor. S3. Obtain and determine the magnitude of the pressure on the circuit breaker operating rod based on the deformation parameters of the compressed spring.

7. The circuit breaker pressure monitoring method according to claim 6, characterized in that, Step S2 specifically includes: S21. Obtain and, based on the initial resistance and transient resistance values ​​of the strip strain gauges in two different directions, as well as the initial deformation and transient deformation of the anisotropic structural strain sensor, obtain the specification factor of the strip strain gauge corresponding to each direction, the expression of which is as follows: ； Wherein, GF represents the specification factor, and R, R0, L, L0 are the transient resistance value, the initial resistance value, the initial deformation of the anisotropic structural strain sensor, and the transient deformation, respectively. S22. Compare and select the extension direction of the strip strain gauge with the larger specification factor as the pressure direction of the circuit breaker operating rod.

8. The circuit breaker pressure monitoring method according to claim 6, characterized in that, Step S3 specifically includes: S31. Obtain the elastic modulus of the compressed spring, the length of the crank connecting rod, the axial strain of the anisotropic structure strain sensor, the initial deformation, and the transient deformation to determine the magnitude of the pressure on the circuit breaker operating rod. Its expression is: ； Where F1, F2, E, and r are the pressure on the circuit breaker operating rod, the elastic force of the compression spring, the elastic modulus of the compression spring, and the length of the crank connecting rod, respectively.

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