Device and method for measuring pressing force of plum blossom contact of circuit breaker of switch cabinet

Abstract

The invention relates to a device for measuring the pressing force of a plum blossom contact of a circuit breaker of a switch cabinet. The device comprises a pressing force sensing probe, a device body and mobile terminal equipment, the pressing force sensing probe comprises three columnar probes and a pull rod, piezoresistive sensors are arranged in the columnar probes, the diameters of the two ends of the pull rod are different, and the pull rod is installed on the inner sides of the three columnar probes and is in sliding contact with the columnar probes; a data processing module, a communication module and a power supply module are arranged in the device body, the data processing module is connected with the pressing force sensing probe, the communication module is in communication connection with the data processing module and mobile terminal equipment, and the power supply module is electrically connected with the data processing module and the communication module. Compared with the prior art, the device has the advantages that the pressing force sensing probe comprises three columnar probes, so that pressure cooperative sensing of three sensors can be realized; radial expansion and stepless diameter changing of the columnar probe are achieved through axial movement of the pull rod, stability and reliability are achieved, and errors are reduced.

Description

Technical Field

[0001] The invention relates to a high-voltage electrical equipment detection technology, in particular to a switch cabinet circuit breaker plum blossom contact pressing force measuring device and a measuring method. Background Art

[0002] High-voltage switchgear is an important equipment responsible for power distribution and protection in the power system. High-voltage switchgear contains switchgear, relay protection devices, measuring instruments and other components, which can realize the operation of circuit breakers, short-circuit protection, overload protection and voltage and current monitoring, and can control, protect and monitor key power equipment such as transformers, generators and lines. As the internal electrical connection components of the switchgear, the plum blossom contacts are in a harsh environment of vibration wear, thermal expansion and contraction for a long time, which will cause the contact degradation of the plum blossom contacts. With the increase of commissioning time, the contact pressure of the contacts continues to decrease, which leads to increased contact resistance, overheating and melting of contact points, and arcing, thereby affecting the normal operation of the switchgear and the safety of the power system. Monitoring the clamping force of the circuit breaker plum blossom contacts can most intuitively reflect their contact status.

[0003] After searching, application publication number CN111693008A discloses a pressure detector for plum blossom contacts, which uses a radial tensioning device to achieve plug-in wear-free measurement of plum blossom contacts; however, the structure uses spiral die and tooth grooves to achieve rotational expansion, the structural reliability is poor, and the device does not provide a method for organizing and managing pressure data. Application publication number CN113465804A discloses a method and device for detecting the clamping force of plum blossom contacts, which uses an expansion tool for pressure measurement and also achieves plug-in wear-free measurement, but the device does not reveal the relationship between the clamping force of the plum blossom contact and the force on the sensor movement in the detection instrument. In the actual measurement process, the rotational expansion of the tool will cause a large measurement error.

[0004] In summary, how to design a plum blossom contact pressing force measuring device and method with a reliable structure and small measurement error is a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a switch cabinet circuit breaker plum contact pressing force measuring device and method in order to overcome the defects of poor structural reliability or large measurement error in the above-mentioned prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, there is provided a device for measuring the clamping force of plum blossom contacts of a switch cabinet circuit breaker, comprising a clamping force sensing probe, a device body and a mobile terminal device, wherein the clamping force sensing probe is mounted at one end of the device body; the clamping force sensing probe comprises three columnar probes and a pull rod, the cross section of the columnar probe is a sector with a vertex angle of 120°, a piezoresistive sensor is arranged inside the columnar probe, the pull rod has different diameters at both ends, is arranged on the inner sides of the three columnar probes and is in slidable contact with the columnar probes; a data processing module, a communication module and a power supply module are arranged in the device body, the data processing module is connected to the clamping force sensing probe, the communication module is communicatively connected to the data processing module and the mobile terminal device, and the power supply module is electrically connected to the data processing module and the communication module.

[0008] As a preferred technical solution, the pull rod is a polygonal pyramid.

[0009] As a preferred technical solution, the clamping force sensing probe also includes a track disk and a rotating shaft, a threaded rod is provided at the smaller end of the pull rod, a thread is provided inside the track disk, and the threaded rod and the thread inside the track disk cooperate with each other; a track is provided on the surface of the track disk, and the columnar probe forms a moving pair with the track; one end of the rotating shaft is connected to the track disk, and the other end passes through the device body.

[0010] As a preferred technical solution, the pressing force sensing probe further includes a wheel and a rocker, the rotating shaft passes through one end of the device body and is connected to the wheel, and the wheel is connected to the rocker.

[0011] As a preferred technical solution, the compression vertical sensing probe further includes an anti-reversal buckle, the wheel is a ratchet wheel, and the anti-reversal buckle is clamped on the ratchet wheel.

[0012] As a preferred technical solution, the pressing force sensing probe further includes a probe outer diameter adjusting gasket, and the probe outer diameter adjusting gasket is detachably mounted on the outer side of the columnar probe.

[0013] As a preferred technical solution, the data processing module includes a data transmitter and an edge calculator, which receives and processes the compression force data from the compression force sensing probe; the data transmitter is connected to the compression force sensing probe, and the edge calculator is connected to the data transmitter and the communication module.

[0014] As a preferred technical solution, the communication module is a wireless transmission module.

[0015] According to another aspect of the present invention, a measurement method using a switch cabinet circuit breaker plum blossom contact pressing force measurement device is provided, which specifically comprises the following steps:

[0016] Step S1, installing a pressing force measuring device into a plum blossom contact;

[0017] Step S2, the pressing force sensing probe collects the pressing force of the plum blossom contact in real time, and transmits it to the mobile terminal device through the communication module after being processed by the data processing module;

[0018] Step S3, the mobile device performs diagnostic analysis on the data and displays an analysis report;

[0019] Step S4, taking out the pressing force measuring device.

[0020] As a preferred technical solution, in step S2, the clamping force sensing probe measures three-way clamping force data, and the clamping force threshold range is set in the data processing module. The processing of the data processing module specifically includes the following steps:

[0021] Step S201, pre-processing the collected pressing force data;

[0022] Step S202, screening the preprocessed data to remove abnormal values;

[0023] Step S203: The three-way pressing force data are compared with each other and with the pressing force threshold range respectively. If the data exceeds or falls below the threshold range, the data processing module issues an alarm.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) The clamping force sensing probe of the present invention includes three columnar probes with fan-shaped cross sections, which can realize the coordinated sensing of pressure of three sensors; the radial expansion and stepless diameter change of the columnar probe are realized by the axial movement of the pull rod, which is stable and reliable and reduces the error; the device body integrates a data processing module, a communication module and a power module, the data processing module receives and processes the clamping force information from the clamping force sensing probe, transmits the data to the mobile device through the communication module, and the power module provides power for the other two modules. The integrated design makes the device miniaturized and convenient for on-site maintenance personnel to operate;

[0026] 2) The present invention adopts a multi-faceted pyramid-shaped pull rod, which supports the clamping force sensing probe to change its diameter by radially expanding the diameter, thereby eliminating the plug-in loss between the clamping force sensing probe and the plum blossom contact; the operator shakes the rocker to drive the wheel to rotate, the wheel drives the rotating shaft to rotate, the rotating shaft drives the track disk to rotate, and the threaded rod cooperates with the thread in the track disk to achieve precise adjustment of the pull rod position;

[0027] 3) The anti-reversal buckle of the present invention is clamped on the ratchet disc, which can achieve stable positioning of the clamping force sensing probe after the diameter is expanded; a detachable probe outer diameter adjustment gasket is adopted, and the corresponding specifications can be selected according to actual needs to adapt to different types of plum blossom contacts;

[0028] 4) The data processing module of the present invention performs edge computing, reduces data redundancy and transmission delay of sensor information by preprocessing the clamping force data and eliminating abnormal values, and can respond to the clamping force status information quickly and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a first overall structural schematic diagram of a switch cabinet circuit breaker plum blossom contact pressing force measuring device of the present invention;

[0030] Figure 2 It is a second overall structural schematic diagram of a switch cabinet circuit breaker plum blossom contact pressing force measuring device of the present invention;

[0031] Figure 3 It is a first schematic diagram of the internal structure of the device of the present invention;

[0032] Figure 4 A second schematic diagram of the internal structure of the device of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of the pressing force sensing probe of the present invention;

[0034] Figure 6 A top view of the compaction force sensing probe of the present invention;

[0035] Figure 7 A bottom view of the pressing force sensing probe of the present invention;

[0036] Figure 8 This is a schematic diagram of the installation structure of the columnar probe of the present invention;

[0037] Fig. 9 This is a schematic diagram of the structure of the probe outer diameter adjustment gasket of the present invention;

[0038] Fig.10 It is a schematic diagram of the structure of the track disk of the present invention;

[0039] Fig.11 It is a schematic diagram of the pull rod structure of the present invention;

[0040] Fig.12 It is a schematic diagram of the rotating shaft structure of the present invention;

[0041] Fig.13 Schematic diagram of the assembly structure of the rocker, ratchet disc and anti-reverse buckle of the present invention

[0042] Fig.14 It is a flow chart of the measuring method of the present invention;

[0043] The numbers in the figure show:

[0044] 1. Compression force sensing probe, 10. Columnar probe (three-petal concentric columnar structure probe), 11. Ratchet disk, 12. Pull rod, 121. Threaded rod (structure at one end of the pull rod), 13. Track disk, 14. Rotating shaft, 15. Wheel, 16. Rocker, 17. Anti-reverse buckle, 18. Probe outer diameter adjustment gasket, 2. Device body, 21. Data processing module, 211. Data transmitter, 212. Edge calculator, 22. Communication module, 23. Power module, 24. Handle. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] Example 1

[0047] like Figure 1 and Figure 2 As shown, this embodiment provides a switch cabinet circuit breaker plum blossom contact compression force measurement device, including a compression force sensing probe 1, a device body 2 and a mobile terminal device.

[0048] like Figure 5 to Figure 7 As shown, the clamping force sensing probe 1 adopts a three-sensor coordinated pressure sensing solution, and the overall three-petal concentric columnar structure design includes three columnar probes, a ratchet disc 11, a pull rod 12, a track disc 13, a rotating shaft 14, a wheel disc 15, a rocker 16, an anti-reversal buckle 17 and a probe outer diameter adjustment gasket 18, as shown in FIG. Figure 8 As shown, the cross section of the columnar probe is a sector with a top angle of 120°. Each columnar probe contains a miniature piezoresistive sensor that can simultaneously collect the clamping force information of multiple contact points of the plum blossom contact.

[0049] like Fig.11 As shown, the rod 12 is a polygonal pyramid structure, which is installed inside the three-petal cylindrical probe and is in slidable contact with the cylindrical probe. Through the axial movement of the polygonal pyramid rod 12, the cylindrical probe is radially expanded to a specified diameter, avoiding the damage to the plum blossom contact caused by the traditional plug-in probe with a fixed diameter during the measurement process. The tail end of the rod 12 is an M8 threaded rod, and the track plate 13 is provided with threads. The threaded rod and the threads in the track plate 13 match, as shown in FIG. Fig.10 As shown, the surface of the track plate 13 is provided with a track, and the columnar probe and the track form a moving pair; Fig.12As shown, one end of the rotating shaft 14 is connected to the track disk 13, and the other end passes through the device body 2 to connect the wheel disk 15, on which a rocker 16 is installed; the wheel disk 15 is a ratchet disk 11; by rotating the rocker 16, the wheel disk 15 drives the rotating shaft 14 to rotate, and the rotating shaft 14 drives the track disk 13 to rotate, and the pull rod 12 moves axially relative to the track disk 13, thereby realizing precise radial diameter change of the columnar probe.

[0050] like Fig.13 As shown, the anti-reversal buckle 17 clamps the ratchet disc 11 in the locked state, restricting the movement of the pull rod 12, so as to achieve stable positioning and accurate measurement of the pressing force sensing probe 1 after the diameter is expanded.

[0051] like Fig. 9 As shown, a probe outer diameter adjustment gasket 18 can be installed on the outside of the cylindrical probe. By installing or removing the probe outer diameter adjustment gasket 18, the change of the probe diameter can be sensed, which can be applied to the measurement of the clamping force information of plum blossom contacts with different inner diameters of multiple models of circuit breakers such as 1250A and 2000A. The applicability and accuracy of the clamping force measurement are significantly improved.

[0052] like Figure 3 and Figure 4 As shown, a data processing module 21 , a communication module 22 and a power supply module 23 are integrated in the device body 2 .

[0053] The data processing module 21 includes a data transmitter 211 and an edge calculator 212, which receive and process the clamping force data from the clamping force sensing probe 1. The data transmitter 211 is connected to the clamping force sensing probe 1, and the edge calculator 212 is connected to the data transmitter 211 and the communication module 22. The data transmitter 211 can be connected to a three-channel piezoresistive sensor, and can realize real-time conversion of sensor signals into standard output signals.

[0054] The communication module 22 is a Zigbee wireless transmission module, which realizes fast and stable data transmission between the device body 2 and the mobile device.

[0055] The battery capacity of the battery module can meet the power demand of the data processing module 21 and the communication module 22 for 48 hours.

[0056] Example 2

[0057] like Fig.14 As shown, this embodiment provides a method for measuring the compression force of the plum blossom contacts of a switch cabinet circuit breaker, using the device in Example 1.

[0058] S1. Select the corresponding specifications of the clamping force sensing probe and the outer diameter adjustment gasket, slowly insert them into the plum blossom contact, and turn the rocker to expand the radial diameter of the clamping force sensing probe to meet the requirements;

[0059] S2, the clamping force sensing probe collects the clamping force information of the plum blossom contact in real time, and converts the sensor signal into a standard output signal through the data transmitter;

[0060] S3. The signal output by the data transmitter is processed by edge computing such as filtering, noise reduction, screening, and outlier removal; data redundancy is reduced, data transmission delay is reduced, and data quality is improved. The edge computing solution can compare and analyze the three-way sensor signals, calculate the average of the three sensors respectively, and evaluate the compression force state of the columnar probe corresponding to each sensor. The edge computing solution uses a preset algorithm to perform real-time analysis on the pre-processed data and sets the compression force threshold range. When the measured value exceeds or falls below the threshold range, the edge sensor device immediately triggers an alarm;

[0061] The plum blossom contact pressing force detection signal contains random noise of a certain amplitude. In order to ensure a low delay, Kalman filtering can be selected to pre-process the acceleration signal. The prediction recursive equation is as follows:

[0062]

[0063] In the formula, is the optimal prediction value at time t; is the optimal estimate at time t-1; A is the state transfer matrix; B is the excitation transfer matrix; U t-1 is the control input value at time t; Q is the system noise covariance; R is the observation noise covariance; is the covariance matrix of the predicted value at time t; K t is the optimal Kalman gain; H is the observation coefficient matrix; Z t is the observed value at time t; is the optimal prediction value at time t; P t is the covariance matrix of the estimated value at time t.

[0064] S4, the processed data is wirelessly transmitted to the mobile device through the communication module;

[0065] S5. According to the analysis results of the status diagnosis system of the mobile terminal device, the operation status of the circuit breaker plum blossom contact is diagnosed, and the maintenance personnel repair the high-voltage equipment according to the diagnosis results and suggestions;

[0066] S6. Turn the rocker in the opposite direction to fully close the sensing probe, and slowly pull it out of the plum blossom contact to end the measurement.

[0067] The present invention achieves adaptation to different types of plum blossom contacts through the design of expanded-diameter probe structure and edge computing, significantly improving the accuracy and applicability of clamping force measurement, helping to timely discover and deal with potential circuit breaker faults, and ensuring the safe and stable operation of high-voltage equipment.

[0068] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A switch cabinet circuit breaker plum blossom contact pressing force measuring device, characterized in that: The invention comprises a pressing force sensing probe (1), a device body (2) and a mobile terminal device, wherein the pressing force sensing probe (1) is mounted at one end of the device body (2); the pressing force sensing probe (1) comprises three columnar probes and a pull rod (12); the cross section of the columnar probe is a fan-shaped one with a vertex angle of 120°; a piezoresistive sensor is arranged inside the columnar probe; the pull rod (12) has different diameters at both ends and is mounted inside the three columnar probes and is in slidable contact with the columnar probes; a data processing module (21), a communication module (22) and a power module (23) are arranged inside the device body (2); the data processing module (21) is connected to the pressing force sensing probe (1); the communication module (22) is communicatively connected to the data processing module (21) and the mobile terminal device; and the power module (23) is electrically connected to the data processing module (21) and the communication module (22).

2. A switch cabinet circuit breaker plum blossom contact pressing force measuring device according to claim 1, characterized in that: The pull rod (12) is a polygonal pyramid.

3. A switch cabinet circuit breaker plum blossom contact pressing force measuring device according to claim 2, characterized in that: The clamping force sensing probe (1) also includes a track plate (13) and a rotating shaft (14); a threaded rod is provided at the smaller end of the pull rod (12); a thread is provided inside the track plate (13); the threaded rod and the thread inside the track plate (13) cooperate with each other; a track is provided on the surface of the track plate (13); the columnar probe and the track form a moving pair; one end of the rotating shaft (14) is connected to the track plate (13), and the other end passes through the device body (2).

4. A switch cabinet circuit breaker plum blossom contact pressing force measuring device according to claim 3, characterized in that: The pressing force sensing probe (1) further comprises a wheel (15) and a rocker (16); the rotating shaft (14) passes through one end of the device body (2) and is connected to the wheel (15); and the wheel (15) is connected to the rocker (16).

5. A switch cabinet circuit breaker plum blossom contact pressing force measuring device according to claim 4, characterized in that: The compression vertical sensing probe further comprises an anti-reversal buckle (17), the wheel disc (15) is a ratchet disc (11), and the anti-reversal buckle (17) is clamped on the ratchet disc (11).

6. A switch cabinet circuit breaker plum blossom contact pressing force measuring device according to claim 1, characterized in that: The pressing force sensing probe (1) further comprises a probe outer diameter adjusting gasket (18), and the probe outer diameter adjusting gasket (18) is detachably mounted on the outer side of the columnar probe.

7. A switch cabinet circuit breaker plum blossom contact pressing force measuring device according to claim 1, characterized in that: The data processing module (21) comprises a data transmitter (211) and an edge calculator (212), which receives and processes the pressing force data from the pressing force sensing probe (1); the data transmitter (211) is connected to the pressing force sensing probe (1), and the edge calculator (212) is connected to the data transmitter (211) and the communication module (22).

8. The switch cabinet circuit breaker plum blossom contact pressing force measuring device according to claim 1, characterized in that: The communication module (22) is a wireless transmission module.

9. A method for measuring the compression force of the plum blossom contact of a switch cabinet circuit breaker using the device for measuring the compression force of the plum blossom contact of a switch cabinet circuit breaker according to any one of claims 1 to 8, characterized in that: The specific steps include: Step S1, installing a pressing force measuring device into a plum blossom contact; Step S2, the pressing force sensing probe (1) collects the pressing force of the plum blossom contact in real time, and after being processed by the data processing module (21), transmits it to the mobile terminal device through the communication module (22); Step S3, the mobile device performs diagnostic analysis on the data and displays an analysis report; Step S4, taking out the pressing force measuring device.

10. The measuring method according to claim 9, characterized in that: In step S2, the clamping force sensing probe (1) measures three-way clamping force data, and a clamping force threshold range is set in the data processing module (21). The processing of the data processing module (21) specifically includes the following steps: Step S201, pre-processing the collected pressing force data; Step S202, screening the preprocessed data to remove abnormal values; Step S203, the three-way pressing force data are compared with each other and with the pressing force threshold range respectively. If the data exceeds or falls below the threshold range, the data processing module (21) issues an alarm.

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