Intelligent power grid isolating switch conductive assembly pressing device and method of use thereof

Abstract

This invention discloses a conductive assembly pressing device for a smart grid disconnector and its usage method, relating to the technical field of disconnector devices. This intelligent grid disconnector conductive assembly pressing device integrates a pressure detection unit, a monitoring unit, and a controller, and presets a closing process parameter model. This enables the perception of the disconnector's closing state and fault judgment, improving early fault warning capabilities. The controller receives real-time signals from these pressure, distance, and temperature sensors and compares them with an internally preset parameter model containing normal closing process displacement-time curves, pressure-time curves, and steady-state pressure and temperature thresholds. This design overcomes the shortcomings of traditional devices that only provide opening and closing position signals, enabling the system to identify various abnormal states and perform graded alarms based on the degree of parameter deviation from the model, thereby achieving intelligent diagnosis and early warning functions.

Description

Technical Field

[0001] This invention relates to the field of disconnector switchgear technology, specifically to a conductive assembly pressing device for a smart grid disconnector switch and its usage method. Background Technology

[0002] Disconnecting switches are devices used in smart grid power transmission and distribution systems to reliably isolate or connect electrical circuits, providing a clear disconnection point for equipment maintenance and line switching operations. Traditional disconnecting switches have a conductive assembly with a pressing device, which typically functions to reliably open and close the moving contact and the stationary contact. The structure includes a frame, an operating arm driven by a motor or manual mechanism, and a moving contact installed at the end of the operating arm between the moving contact and the stationary contact. When closing, the operating arm drives the moving contact downward until it presses against the stationary contact, and the contact pressure is maintained by the mechanical structure. When opening, the operation is reversed, causing the moving contact to lift away from the stationary contact. This design has been used for a long time and is mature and effective in providing basic isolation functions.

[0003] However, the traditional design also has the following shortcomings. First, the traditional device cannot make fault judgments based on the contact state. Operators or control systems cannot directly obtain key information such as whether the closing is in place, whether the contact pressure is up to standard, and whether the temperature rise of the contact part is abnormal. They can only make a rough judgment based on the mechanism position signal. It is difficult to detect poor contact or potential overheating risks caused by contact erosion, mechanical jamming, etc. The judgment of the closing process is too simplistic, usually relying only on the limit switch signal of the drive motor or mechanism to determine the end point of opening and closing. It cannot monitor and analyze the dynamic process of closing, so it is difficult to detect early faults. Moreover, equipment maintenance relies heavily on regular inspections and preventive tests, and lacks the ability to predict the life based on actual operating conditions and mechanical and electrical performance degradation data. This can easily lead to insufficient maintenance causing faults or excessive maintenance causing resource waste. In view of the shortcomings of the existing technology, this invention provides a smart grid disconnect switch conductive assembly pressure-down device and its usage method to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a smart grid disconnect switch conductive assembly pressure-down device and its usage method to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a conductive assembly pressing device for a smart grid disconnect switch, comprising: frame; A moving contact and a stationary contact, wherein the moving contact is movably disposed on the frame and is used to engage or disengage with the stationary contact fixed on the frame; A drive unit, mounted on the frame, is used to drive the moving contact to perform opening and closing actions; A pressure detection unit is disposed between the stationary contact and the frame, and is used to detect the contact pressure when the moving contact and the stationary contact are engaged in real time; The monitoring unit includes a distance sensor for monitoring the operating position of the drive unit and a temperature sensor for monitoring the temperature at the stationary contact. The controller is connected to the pressure detection unit, the distance sensor and the temperature sensor. The controller has a pre-set closing process parameter model and multiple early warning thresholds, which are used to judge the closing status, perform fault classification alarms and predict contact life based on the received real-time signals.

[0006] Preferably, the pressure detection unit includes a positioning seat fixed on the frame and a pressure sensor installed between the positioning seat and the stationary contact. The positioning seat is elastically connected to the bottom accessory of the stationary contact via an elastic element.

[0007] Preferably, the positioning seat is provided with a guide rod, and the bottom accessory of the stationary contact includes a second insulator for installing insulation, the second insulator being slidably sleeved on the guide rod through the installation accessory.

[0008] Preferably, the driving unit includes: A rotating shaft is rotatably connected to the frame; The clamping arm has one end fixed to the rotating shaft; The drive unit is fixed to the rotating shaft; Mounting base, fixed on the frame; An electric actuator is mounted on the mounting base, and its output end is connected to a slide. The movable block is rotatably connected to the carriage and slidably connected to the drive unit; The slide is hinged to the movable block, and the extension and retraction of the electric push rod drives the drive unit and the rotating shaft to rotate through the slide and the movable block, thereby driving the clamping arm to swing.

[0009] Preferably, the bottom of the moving contact is rotatably connected to the frame via a first insulator; the free end of the clamping arm is connected to the moving contact via a third insulator, and the two ends of the third insulator are rotatably connected to the clamping arm and the moving contact, respectively.

[0010] Preferably, the distance sensor is mounted on the mounting base and is used to monitor the displacement of the carriage.

[0011] Preferably, the controller is configured as follows: The system receives signals from the pressure sensor, the distance sensor, and the temperature sensor in real time. The real-time signal is compared with the preset closing process parameter model, and a graded alarm signal is triggered according to the situation of exceeding different warning thresholds. The graded alarm includes at least one or more of the following: abnormal contact pressure, closing position deviation, and overheating. Based on historical data of pressure, temperature, and displacement during multiple closing processes, the remaining lifespan of the moving contact and the stationary contact is predicted using a trend analysis algorithm.

[0012] Preferably, the closing process parameter model includes the theoretical displacement-time curve of the carriage, the theoretical pressure-time curve of the pressure sensor, and the theoretical pressure value and temperature threshold after the closing steady state during the closing process.

[0013] Preferably, the elastic element is a disc spring assembly or a helical spring, used to provide buffering and maintain the steady-state contact pressure of the stationary contact at the moment of closing.

[0014] This invention also discloses a method for using the aforementioned intelligent grid disconnect switch conductive assembly pressure-down device, characterized by comprising the following steps: Step S1, Initial position confirmation: The controller reads the distance sensor signal to confirm that the moving contact is in the initial open position; Step S2, Closing process drive and monitoring: The controller starts the drive unit, drives the moving contact to move towards the stationary contact, and simultaneously collects the displacement signal of the distance sensor, the pressure signal of the pressure sensor and the temperature signal of the temperature sensor in real time. Step S3, Acquisition and Analysis of Closing Parameters: After the moving contact and the stationary contact come into contact, the controller records the final displacement value, steady-state contact pressure value and steady-state temperature value when the circuit is closed. Step S4, Fault Diagnosis and Alarm: The controller compares the real-time parameters obtained in steps S2 and S3 with the preset closing process parameter model and early warning threshold. If parameter abnormalities occur, the controller will trigger corresponding graded alarms according to the type of abnormality and the degree to which the threshold is exceeded. Step S5, Life Prediction and Early Warning: The controller stores the steady-state contact pressure value, steady-state temperature value, and position displacement value of the current and historical closing processes. By analyzing their changing trends, it calculates the wear status of the contacts and predicts the remaining life. When the predicted life is lower than the set value, an early warning is issued.

[0015] The technical effects and advantages of this invention are as follows: 1. This intelligent grid disconnector's conductive assembly pressure-lowering device, by integrating a pressure detection unit, a monitoring unit, and a controller, and pre-setting a closing process parameter model, realizes the perception of the disconnector's closing status and fault judgment, improving the early warning capability of faults. The pressure sensor detects and feeds back the contact pressure when the moving contact and stationary contact are engaged in real time; the distance sensor monitors the displacement of the slide in the drive unit, indirectly and accurately reflecting the movement trajectory of the moving contact and the closing position; the temperature sensor monitors the operating temperature at the stationary contact. The controller receives these real-time signals and compares and analyzes them with the internally preset parameter model, which includes the normal closing process displacement-time curve, pressure-time curve, and steady-state pressure and temperature thresholds. This design overcomes the shortcomings of traditional devices that can only provide opening and closing position signals, enabling the system to identify various abnormal states and to perform graded alarms according to the degree of parameter deviation from the model, thereby realizing status monitoring and achieving intelligent diagnosis and early warning functions.

[0016] 2. The conductive assembly pressing device of this smart grid disconnect switch, by placing a pressure sensor between the stationary contact and the frame, and adopting a structure combining a positioning seat, elastic element, and guide rod, achieves reliable maintenance of contact pressure while also providing buffer protection. The pressure sensor directly bears the pressure from the stationary contact, ensuring direct and accurate measurement. At the moment of closing, the elastic element effectively buffers the impact of the moving contact on the stationary contact, protecting the pressure sensor and the contact surface. After the closing steady state, the compression deformation of the elastic element generates a continuous restoring force, which, together with the downward pressure of the drive unit, constitutes a stable contact pressure. This automatically compensates for minute gaps caused by thermal expansion and contraction or slight wear, ensuring contact reliability and improving the mechanical adaptability and measurement reliability of the device.

[0017] 3. The intelligent grid disconnect switch conductive assembly pressing device, through the use of a specific linkage drive mechanism consisting of an electric push rod, a slide, a movable block, a drive unit, and a rotating shaft, and in conjunction with a distance sensor installed on it, achieves precise control and high-precision position monitoring of the closing action process, facilitating accurate fault location. The distance sensor directly monitors the linear displacement of the slide, which is directly connected to the output end of the electric push rod. This displacement has a definite and calculable proportional relationship with the angular displacement of the moving contact, the linear displacement of the contact end, and the final contact pressure. Therefore, monitoring the slide displacement can not only accurately determine whether the closing is in place, but the displacement-time curve directly reflects the overall motion performance of the drive mechanism. By comparing the real-time displacement curve with the theoretical model curve, the controller can sensitively diagnose early faults inside the drive system, such as decreased electric push rod thrust, poor lubrication of the transmission joint, and slight jamming, facilitating maintenance and repair. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a three-dimensional structural diagram of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is an enlarged schematic diagram of the installation position of the pressure sensor of the present invention; Figure 6 This is a schematic diagram of the bottom of the mounting base of the present invention; Figure 7 For the present invention Figure 6 Transmission diagram of the central drive unit; Figure 8 This is a schematic diagram of the bottom view of the present invention; Figure 9 This is the logic diagram for the present invention; Figure 10 This is a flowchart of the method of the present invention.

[0020] In the diagram: 1. Frame; 2. Clamping arm; 21. Rotating shaft; 211. Drive unit; 22. Mounting base; 23. Electric push rod; 24. Slide carriage; 25. Moving block; 26. Third insulator; 3. Moving contact; 31. First insulator; 4. Stationary contact; 41. Second insulator; 5. Positioning seat; 51. Pressure sensor; 52. Elastic element; 53. Guide rod; 6. Distance sensor; 7. Temperature sensor; 8. Controller. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This embodiment discloses a conductive assembly pressing device for a smart grid disconnect switch, according to the attached... Figure 1 To be continued Figure 10As shown, it includes a frame 1, a moving contact 3, a stationary contact 4, a drive unit, a pressure detection unit, a monitoring unit, and a controller 8.

[0023] The frame 1 serves as the supporting structure for the entire device. The stationary contact 4 is indirectly and elastically floatingly mounted on the frame 1 through the pressure detection unit. The moving contact 3 is movably mounted on the frame 1 and can engage or disengage with the stationary contact 4 under the drive of the drive unit. The monitoring unit is used to collect the operating position signal of the drive unit and the temperature signal at the stationary contact 4 in real time. The controller 8 is connected to the pressure detection unit and the monitoring unit to process real-time data and compare it with the preset closing process parameter model and early warning threshold, thereby realizing the judgment of closing status, fault classification alarm and contact life prediction.

[0024] According to the appendix Figure 2 To be continued Figure 5 As shown, the pressure detection unit includes a positioning seat 5 fixed on the frame 1. A pressure sensor 51 is installed on the top of the positioning seat 5. The bottom of the stationary contact 4 includes a second insulator 41 for mounting insulation. The second insulator 41 is mounted on the detection surface of the pressure sensor 51 through an mounting accessory, so that the contact pressure between the moving contact 3 and the stationary contact 4 can be transmitted to the pressure sensor 51 through the stationary contact 4 and the second insulator 41. The top of the positioning seat 5 is elastically connected to the second insulator 41 through an elastic element 52. Specifically, to ensure that the stationary contact 4 and the second insulator 41 move vertically without deflection when under pressure, at least two guide rods 53 are vertically arranged on the positioning seat 5. A linear bearing or a smooth bushing is correspondingly provided on the mounting accessory at the bottom of the second insulator 41, so that the second insulator 41 can be slidably sleeved on the guide rods 53.

[0025] According to the appendix Figure 1 Appendix Figure 3 Appendix Figure 6 and attached Figure 7As shown, the drive unit specifically includes a rotating shaft 21, a clamping arm 2, a drive unit 211, a mounting base 22, an electric push rod 23, a slide 24, and a movable block 25. The rotating shaft 21 is rotatably connected to the frame 1 via a bearing seat. One end of the clamping arm 2 is fixedly fitted onto the rotating shaft 21. The drive unit 211 is also fixed to the rotating shaft 21 and is typically a crank or lever with a radially extending slide groove. The mounting base 22 is fixed to the frame 1 and located below the rotating shaft 21. The tail end of the cylinder of the electric push rod 23 is hinged or fixed to the mounting base 22. The output end of the electric push rod 23 is connected to a... The slide 24 is connected, and the slide 24 is provided with a joint bearing or hinge hole. The movable block 25 is rotatably connected to the slide 24 through a pin. One end of the movable block 25 is slidably connected to the slide groove on the drive unit 211 through a slider or roller, and the other end is hinged to the joint bearing or hinge hole of the slide 24. When the electric push rod 23 extends or retracts, it drives the slide 24 to move linearly. The slide 24 then drives the drive unit 211 to move around the rotating shaft 21 through the movable block 25, and finally drives the rotating shaft 21 and the clamping arm 2 to rotate synchronously, realizing the closing and opening actions. Further, as shown in the attached figure. Figure 1 and attached Figure 4 As shown, the bottom of the moving contact 3 is rotatably connected to the frame 1 through the first insulator 31, forming a fulcrum. The far end of the pressing arm 2 is connected to the upper part of the moving contact 3 through the third insulator 26. The two ends of the third insulator 26 are respectively hinged to the pressing arm 2 and the moving contact 3. In this way, the movement of the pressing arm 2 will be converted into the rotation of the moving contact 3 around the fulcrum of the first insulator 31 at its bottom, so that the contact end of the moving contact 3 is pressed down or lifted up, realizing the engagement and separation with the stationary contact 4.

[0026] According to the appendix Figure 6 and attached Figure 8 As shown, the monitoring unit includes a distance sensor 6 and a temperature sensor 7. The distance sensor 6 is preferably a linear displacement sensor or a laser rangefinder. The distance sensor 6 is fixedly installed on the mounting base 22. The detection probe of the distance sensor 6 is aligned with a fixed measurement point of the slide 24 to monitor the linear displacement of the slide 24 in real time. Since there is a definite geometric mapping relationship between the displacement of the slide 24 and the swing angle of the clamping arm 2, and further with the contact end displacement of the moving contact 3, monitoring the displacement of the slide 24 can be equivalent to monitoring the position information of the closing process. The temperature sensor 7 is preferably a non-contact infrared temperature sensor, which is fixedly installed on the frame 1 or the positioning base 5. Its probe is aligned with the conductive part of the stationary contact 4 or the nearby area to monitor the temperature of the contact area after closing in real time.

[0027] According to the appendix Figure 1 Appendix Figure 9 and attached Figure 10As shown, the controller 8 can be an industrial PLC or a dedicated embedded system. It is connected to the drive circuits of the pressure sensor 51, distance sensor 6, temperature sensor 7, and electric push rod 23 via signal cables. The internal memory of the controller 8 is pre-loaded with a closing process parameter model and multiple warning thresholds. The closing process parameter model includes: the theoretical curve of the displacement of the slide 24 over time during the closing process under ideal normal conditions; the theoretical curve of the pressure detected by the pressure sensor 51 over time after the moving contact 3 and the stationary contact 4 come into contact during the closing process; the theoretical steady-state pressure range that the pressure sensor 51 should reach and the theoretical temperature threshold range that the temperature sensor 7 should maintain after the closing is complete and enters a steady state. The warning thresholds are set according to the model parameters and safety margins and are divided into different levels, such as warning, alarm, and emergency trip.

[0028] The controller 8 is configured to perform the following core functions: During the closing operation, it receives signals from the pressure sensor 51, distance sensor 6, and temperature sensor 7 in real time, compares the received real-time displacement and pressure signals with theoretical curves, and compares the steady-state real-time pressure and temperature values ​​with the theoretical range. Based on the comparison results, if the real-time parameters deviate from the theoretical values ​​and exceed the set thresholds of different levels, it triggers corresponding graded alarm signals. The alarm types include at least one or more of the following: abnormal contact pressure, closing position deviation, and overheating abnormality. In addition, the controller 8 also stores historical data of key parameters during each closing operation and after steady-state operation, such as the final displacement at the closing position, steady-state contact pressure, and steady-state temperature. Through the built-in trend analysis algorithm, it analyzes the wear and aging status of the contacts and predicts the remaining electrical life of the moving contact 3 and the stationary contact 4. When the predicted remaining life is lower than the preset safety threshold, the controller 8 will issue a maintenance warning.

[0029] Furthermore, the elastic element 52 is preferably a disc spring assembly or a high-performance helical spring, which has two main functions: first, at the moment of closing, it provides buffering when the moving contact 3 hits the stationary contact 4, absorbs the impact energy, and protects the pressure sensor 51 and the contact structure; second, after the closing steady state, the restoring force generated by its elastic deformation works together with the downward pressure provided by the drive unit to maintain a stable and reliable contact pressure between the moving and stationary contacts, and compensate for the dimensional changes caused by thermal expansion and contraction or slight wear.

[0030] Specifically disclosed, as shown in the attached document. Figure 1 Appendix Figure 4 and attached Figure 5As shown, the electrical insulation design of the entire device is as follows: the moving contact 3 is insulated from the grounded frame 1 through the first insulator 31; the stationary contact 4 is insulated from the positioning seat 5, pressure sensor 51 and frame 1 through the second insulator 41; the clamping arm 2 is insulated from the moving contact 3 through the third insulator 26; the clamping arm 2 itself is made of insulating material or has insulation treatment between it and the rotating shaft 21. This multi-stage insulation design ensures that the conductive moving contact 3 and stationary contact 4 are completely isolated from the low-voltage control and sensing components under high voltage conditions, thus ensuring the safe operation of the device.

[0031] Specifically disclosed, the drive unit has force amplification and self-locking characteristics. The slide groove design of the drive part 211, the hinge point position of the movable block 25 and the carriage 24, and the installation angle of the electric push rod 23 have been optimized and calculated. When the clamping arm 2 is close to the closed position, the electric push rod 23 only needs to output a small thrust to generate a large contact pressure at the contact. Furthermore, the drive unit has good self-locking properties in steady state. Even if the electric push rod 23 is de-energized, the contact pressure can be basically maintained, which improves reliability. The distance sensor 6 is also used to monitor the displacement of the carriage 24.

[0032] According to the appendix Figure 1 To be continued Figure 10 As shown, it is particularly important to emphasize that the fault diagnosis logic of controller 8 is hierarchical and multi-parameter fusion. It not only judges whether the final value of a single parameter exceeds the standard, but also pays attention to the dynamic process of closing. For example, by comparing the real-time displacement corresponding to the time curve with the theoretical curve, it can diagnose whether the drive mechanism is stuck or whether the motor is out of step; by comparing the real-time pressure corresponding to the time curve, it can judge whether there is bouncing at the moment of contact, whether there are foreign objects or severe burning on the contact surface; by combining the displacement arrival signal and the final pressure value, it can comprehensively judge whether the closing is truly in place. The temperature parameter is used to diagnose hidden faults such as increased contact resistance and overload during long-term operation. This multi-sensor information fusion diagnosis based on the dynamic process model improves the fault identification rate and early warning capability.

[0033] According to the appendix Figure 1 To be continued Figure 10As shown, it is particularly important to emphasize that the life prediction function is data-driven. The controller 8 establishes data records for each closing operation, including timestamp, ambient temperature, number of closing operations, steady-state contact pressure Ps, steady-state contact temperature Ts, and positioning displacement Lf. The electrical life of the contacts is mainly affected by the increase in contact resistance and mechanical wear. Increased contact resistance will lead to an increase in temperature rise Ts under the same current; mechanical wear will lead to a need for a larger drive displacement Lf to achieve the same contact pressure, or a decrease in contact pressure Ps under the same drive displacement. The controller 8 analyzes the changing trends of parameters such as Ps, Ts, and Lf with time or number of operations, and uses linear regression, exponential smoothing, or more complex machine learning algorithms to establish an aging model and extrapolate to predict the remaining number of operations or the remaining service life.

[0034] Example 1: This example uses a normal closing operation as an example, combined with the attached... Figure 1 To be continued Figure 10 The workflow is explained in detail below: S1 Initial Position Confirmation: Before the closing command is issued, the controller 8 reads the signal from the distance sensor 6 to confirm that the slide 24 is in the initial position corresponding to the opening state, that is, the moving contact 3 is in the raised state and separated from the stationary contact 4.

[0035] S2 Start-up and Process Monitoring: The controller 8 sends an extension command to the electric push rod 23, which pushes the slide 24 to move linearly. The slide 24 drives the movable block 25 to swing. The slider on the movable block 25 slides in the groove of the drive unit 211, causing the drive unit 211 and the rotating shaft 21 to rotate counterclockwise (as shown in the attached figure). The rotating shaft 21 drives the clamping arm 2 to swing downward. The clamping arm 2 pulls the moving contact 3 to rotate downward around the fulcrum of the first insulator 31 at its bottom through the third insulator 26. Throughout the process, the controller 8 synchronously collects the displacement signal L(t) of the distance sensor 6, the pressure signal P(t) of the pressure sensor 51, and the temperature signal T(t) of the temperature sensor 7 at a high frequency. In the initial stage, the pressure signal P(t) is zero and the temperature T(t) is the ambient temperature.

[0036] S3 Contact and Parameter Acquisition: When the contact end of the moving contact 3 makes mechanical contact with the stationary contact 4, the pressure sensor 51 begins to detect pressure. As the electric push rod 23 continues to extend, the mechanism passes the force amplification point, the contact pressure increases rapidly, and the elastic element 52 is compressed. When the slide 24 reaches the preset theoretical closing position Lth, the controller 8 considers the closing action to be completed. At this time, the current final displacement measurement value Lf is recorded, and the steady-state contact pressure value Ps is recorded after the pressure stabilizes. At the same time, the contact temperature is monitored, and the steady-state temperature value Ts is recorded after the thermal stability is achieved by energizing for a period of time.

[0037] S4 Diagnosis and Analysis: Controller 8 performs automatic diagnosis: ① Determines whether Lf is within the allowable tolerance range of Lth±ΔL; ② Compares the recorded displacement-time series L(t) and pressure-corresponding time series P(t) with the pre-stored theoretical curve to check whether the dynamic process is normal; ③ Determines whether Ps is within the allowable range of the rated pressure Pr; ④ Determines whether Ts is lower than the maximum allowable temperature T_max. Since this example is a normal closing, all parameters are within the normal threshold range, and controller 8 displays that the closing was successful and the status is normal.

[0038] S5 Data Storage and Lifespan Update: Controller 8 encrypts and stores the Lf, Ps, Ts and process characteristic data of this closing operation into the historical database. The lifespan prediction module calls the historical data and recalculates the contact aging trend. Assuming that after thousands of operations, Ps shows a slow linear decline trend, but the current value is still much higher than the maintenance threshold, and Ts also remains stable, then the remaining lifespan is predicted to be sufficient, and no warning is issued.

[0039] Example 2: This example uses insufficient pressure caused by slight ablation of the contact surface of the contactor as an example, combined with the attached... Figure 1 To be continued Figure 10 The workflow is explained in detail below: Steps S1-S2 are the same as in Example 1. Controller 8 starts closing the circuit and monitors L(t), P(t), and T(t).

[0040] Step S3: When the carriage 24 reaches the theoretical closing position Lth, the controller 8 records Lf≈Lth and determines that the position is normal. However, the detected steady-state pressure Ps is significantly lower than the lower limit of the rated pressure Pr, for example, lower than 85% of Pr.

[0041] Step S4: Controller 8 performs a logical judgment: the displacement is normal, but the steady-state pressure is low, which indicates a fault of insufficient contact pressure. Controller 8 immediately triggers a first-level alarm, a warning level, and displays a warning on the local HMI or remote monitoring center: the contact pressure is too low. At the same time, controller 8 may analyze the pressure establishment curve P(t) and find that its final steady-state value is low, but the curve shape is normal. This eliminates the possibility of jamming caused by foreign objects causing a sudden rise or fall in pressure, and further confirms that the pressure dispersion is caused by a decrease in the flatness of the contact surface.

[0042] Step S5: The abnormal pressure value Ps is recorded. The life prediction module recognizes this as an acceleration point of pressure decay, adjusts the prediction model, and shortens the predicted remaining life. If the predicted life is still within the safe range, only an alarm is recorded; if the pressure is so low that it endangers normal operation, a higher-level alarm is triggered, and planned maintenance is recommended.

[0043] Example 3: This example uses a slight jamming of the drive mechanism or a decrease in the thrust of the electric push rod 23, resulting in incomplete closing, as an example, combined with the attached... Figure 1 To be continued Figure 10 The workflow is explained in detail below: Steps S1-S2 are the same as in Example 1.

[0044] Step S3: The controller 8 detects that the electric push rod 23 has stopped extending, but at this time the recorded final displacement Lf of the carriage 24 is less than the theoretical closing position Lth, and the difference exceeds the allowable tolerance + ΔL.

[0045] Step S4: Controller 8 logic judgment: Insufficient positioning displacement. At this time, pressure sensor 51 may detect a certain pressure Ps, but the pressure value is far from the rated value. Controller 8 triggers a level 2 alarm, indicating that the closing position is not in place and the positioning displacement deviation is too large. At the same time, controller 8 replays and analyzes the L(t) curve. If it is found that the slope of the second half of the curve decreases, it indicates that the drive is blocked. This helps maintenance personnel to locate the fault, which may be due to insufficient lubrication or slight deformation of the electric push rod 23 itself or the transmission linkage mechanism.

[0046] Step S5: The abnormal displacement value Lf and the low pressure value Ps are recorded. Since the incomplete closing is a serious fault, the controller 8 can automatically prohibit subsequent closing operations or force an attempt to open or close the circuit to clear any possible temporary jamming.

[0047] Example 4: This example uses the case of overheating caused by increased contact resistance due to long-term wear of the contacts as an example, combined with the attached... Figure 1 To be continued Figure 10 The workflow is explained in detail below: After the device is closed, it remains in a state of long-term energized operation.

[0048] Steps S3 and S4: During the operation monitoring phase, temperature sensor 7 continuously monitors the temperature of stationary contact 4. Controller 8 finds that, under the same load current conditions, the recorded steady-state operating temperature Ts is consistently higher than the historical average temperature under the same operating conditions and exceeds the first-stage warning threshold Tw, but has not yet reached the trip threshold Ta.

[0049] Controller 8 triggers a Level 1 overheat warning, indicating that the contact operating temperature is too high and suggesting an inspection. At the same time, controller 8 checks the steady-state pressure Ps of the most recent closing records and may find that Ps has a slow decreasing trend.

[0050] Step S5: The life prediction module combines the two strongly correlated signals of slow pressure decrease and temperature increase under the same operating conditions to determine that the contact resistance is increasing. The module uses an exponential degradation model to predict that the contact temperature will reach the danger threshold after the current temperature rise rate and pressure decay rate. The controller 8 calculates the remaining life based on this and issues a contact life warning, suggesting that maintenance be arranged before the calculated date. This provides an accurate time window for planned maintenance.

[0051] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A conductive assembly pressing device for a smart grid disconnect switch, characterized in that, include: Rack (1); Moving contact (3) and stationary contact (4), wherein the moving contact (3) is movably disposed on the frame (1) for engaging or disengaging with the stationary contact (4) fixed on the frame (1); A drive unit is mounted on the frame (1) and is used to drive the moving contact (3) to perform opening and closing actions; A pressure detection unit is disposed between the stationary contact (4) and the frame (1) for real-time detection of the contact pressure when the moving contact (3) and the stationary contact (4) are engaged; The monitoring unit includes a distance sensor (6) for monitoring the operating position of the drive unit and a temperature sensor (7) for monitoring the temperature at the stationary contact (4). The controller (8) is connected to the pressure detection unit, the distance sensor (6) and the temperature sensor (7). The controller (8) has a pre-set closing process parameter model and multiple early warning thresholds, which are used to judge the closing status, perform fault classification alarm and predict contact life based on the received real-time signal.

2. The electrically conductive assembly push-down device for a smart grid disconnect switch of claim 1, wherein, The pressure detection unit includes a positioning seat (5) fixed on the frame (1) and a pressure sensor (51) installed between the positioning seat (5) and the stationary contact (4). The positioning seat (5) is elastically connected to the bottom accessory of the stationary contact (4) through an elastic element (52).

3. The smart grid disconnect switch conduction assembly push down device of claim 2, wherein, The positioning seat (5) is provided with a guide rod (53), and the bottom accessory of the stationary contact (4) includes a second insulator (41) for installing insulation. The second insulator (41) is slidably sleeved on the guide rod (53) through the installation accessory.

4. The smart grid disconnect switch conduction assembly push down device of claim 2, wherein, The driving unit includes: A rotating shaft (21) is rotatably connected to the frame (1); The clamping arm (2) is fixed at one end to the rotating shaft (21); The drive unit (211) is fixed to the rotating shaft (21); Mounting base (22) is fixed on the frame (1); An electric push rod (23) is mounted on the mounting base (22), and its output end is connected to a slide (24). The movable block (25) is rotatably connected to the slide (24) and slidably connected to the drive unit (211); The slide (24) is hinged to the movable block (25). The extension and retraction of the electric push rod (23) drives the drive unit (211) and the rotating shaft (21) to rotate through the slide (24) and the movable block (25), thereby driving the clamping arm (2) to swing.

5. The electrically conductive assembly of claim 4, wherein the electrically conductive assembly is a smart grid disconnect switch. The bottom of the moving contact (3) is rotatably connected to the frame (1) via the first insulator (31); the free end of the clamping arm (2) is connected to the moving contact (3) via the third insulator (26), and the two ends of the third insulator (26) are rotatably connected to the clamping arm (2) and the moving contact (3) respectively.

6. The electrically conductive assembly of claim 4, wherein the electrically conductive assembly is a smart grid disconnect switch. The distance sensor (6) is mounted on the mounting base (22) and is used to monitor the displacement of the carriage (24).

7. The smart grid disconnect switch conduction assembly push down device of claim 4, wherein, The controller (8) is configured as follows: The system receives signals from the pressure sensor (51), the distance sensor (6), and the temperature sensor (7) in real time. The real-time signal is compared with the preset closing process parameter model, and a graded alarm signal is triggered according to the situation of exceeding different warning thresholds. The graded alarm includes at least one or more of the following: abnormal contact pressure, closing position deviation, and overheating. Based on historical data of pressure, temperature and displacement during multiple closing processes, the remaining lifespan of the moving contact (3) and the stationary contact (4) is predicted by a trend analysis algorithm.

8. The smart grid disconnect switch conduction assembly push down device of claim 7, wherein, The closing process parameter model includes the theoretical displacement-time curve of the slide (24), the theoretical pressure-time curve of the pressure sensor (51), and the theoretical pressure value and temperature threshold after the closing steady state during the closing process.

9. The smart grid disconnect switch conduction assembly push down device of claim 2, wherein, The elastic element (52) is a disc spring assembly or a helical spring, used to provide buffering and maintain the steady-state contact pressure of the stationary contact (4) at the moment of closing.

10. A method of using the intelligent grid disconnect switch conductive assembly pressure-down device as described in any one of claims 1-9, characterized in that, Includes the following steps: Step S1, the controller (8) reads the signal from the distance sensor (6) and confirms that the moving contact (3) is in the initial position of opening; In step S2, the controller (8) starts the drive unit, drives the moving contact (3) to move towards the stationary contact (4), and simultaneously collects the displacement signal of the distance sensor (6), the pressure signal of the pressure sensor (51), and the temperature signal of the temperature sensor (7) in real time. Step S3: After the moving contact (3) contacts the stationary contact (4), the controller (8) records the final displacement value, steady-state contact pressure value and steady-state temperature value when the circuit is closed. Step S4, the controller (8) compares the real-time parameters obtained in steps S2 and S3 with the preset closing process parameter model and early warning threshold. If parameter abnormality occurs, the corresponding graded alarm is triggered according to the abnormality type and the degree of exceeding the threshold. Step S5, the controller (8) stores the steady-state contact pressure value, steady-state temperature value and position displacement value of the current and historical closing processes, calculates the wear state of the contacts by analyzing their changing trends, and predicts the remaining life. When the predicted life is lower than the set value, an early warning prompt is issued.

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