Intelligent driving control method and system for swing-arm isolating switch

Abstract

The application provides a swing-arm type isolating switch intelligent driving control method and system, and relates to the technical field of isolating switch control. The method comprises the following steps: obtaining driving parameters of a driving motor and pre-contact electrical parameters of a moving contact, comparing the parameters with corresponding preset reference characteristics, analyzing the mechanical state of a transmission chain and the contact quality of the moving contact, judging whether the moving contact is safely closed, and locking a main circuit breaker when it is judged that the moving contact is not safely closed. The method aims to solve the technical problems that, in the long-term operation and maintenance process of high-voltage electrical isolating switches, the actual closing pressure of the contact is insufficient due to mechanical wear and transmission chain error, the electrical contact quality is reduced, and the traditional control system cannot accurately evaluate the actual electrical contact quality of the contact and reliably judge the safe closing state, thereby significantly improving the reliability and safety of the operation of the isolating switch and effectively reducing the occurrence probability of power system failures.

Description

Technical Field

[0001] This invention relates to the field of disconnector control technology, and more specifically, to an intelligent drive control method and system for a swing-arm disconnector. Background Technology

[0002] High-voltage disconnect switches are indispensable key equipment in power systems, primarily used to isolate circuits under no-load conditions, ensuring safety during equipment maintenance. To achieve precise and reliable opening and closing operations, modern disconnect switches generally employ intelligent control methods, using a motor to drive gears and a swing arm, causing the contacts to move linearly back and forth. However, during long-term operation and maintenance, especially due to the gradual decline in lubricant performance and the accumulation of gear wear, errors may occur in the transmission chain, thus affecting the actual closing pressure of the contacts and the quality of electrical contact.

[0003] In actual long-term operation and maintenance, some unforeseen factors may gradually accumulate, profoundly impacting the system's performance and reliability. For example, due to the slow and gradual decline in lubricant performance, the tooth surface of the main drive gear will experience higher local frictional forces than designed during each opening and closing operation. This increase in friction is not sudden but gradually intensifies with the continuous deterioration of lubricant performance. Under the long-term action of high friction, the surface material of the tooth surface will experience accelerated wear. As tooth surface wear further accumulates, the gear meshing clearance will gradually increase, leading to an increase in the cumulative error and transmission play of the entire transmission chain. This means that even if the position encoder of the drive motor accurately indicates that it has rotated to the predetermined target position, due to these "plays" or looseness within the transmission chain, the actual displacement ultimately transmitted to the swing arm and contact will deviate.

[0004] Meanwhile, during prolonged operation, the contact surfaces of high-voltage disconnect switches gradually develop an oxide layer and surface unevenness due to factors such as normal arc erosion, corrosive gases in the environment, and dust adhesion. Because of the cumulative errors in the transmission chain, when the drive motor reaches the preset "closed-complete" position, the actual final closing pressure transmitted to the contacts is less than the design value. This insufficient pressure prevents the contacts from forming a tight and sufficient physical contact with the stationary contacts, reducing the effective conductive area of ​​the contact surface and resulting in a contact resistance far exceeding the normal operating value.

[0005] Traditional intelligent control systems often rely solely on the position information of the drive motor to determine whether a switch is "in position." This makes it difficult for the system to detect actual electrical contact problems caused by mechanical wear, leading to risks of localized overheating, arcing, or even line tripping during load operation. The system makes an erroneous judgment of "in position" based solely on position information, without knowing the actual electrical contact quality of the contacts. Therefore, accurately assessing the actual electrical contact quality of disconnector switch contacts and reliably determining their safe closing state is a pressing technical challenge that needs to be addressed. Summary of the Invention

[0006] The purpose of this invention is to provide an intelligent drive control method and system for a swing-arm disconnector, which aims to solve the technical problems of insufficient actual contact closing pressure and decreased electrical contact quality caused by mechanical wear and transmission chain errors during long-term operation and maintenance of high-voltage disconnectors, as well as the inability of traditional control systems to accurately assess the actual electrical contact quality and reliably determine its safe closing state. This invention significantly improves the reliability and safety of disconnector operation and effectively reduces the probability of power system failures.

[0007] In a first aspect, the present invention provides an intelligent drive control method for a swing arm disconnect switch, which is used to control the swing arm disconnect switch. The swing arm disconnect switch includes a drive motor, a gear, a swing arm and a moving contact connected in sequence. The gear, as a transmission chain, is used to drive the swing arm to swing under the drive of the drive motor, and the swing arm drives the moving contact to perform linear reciprocating motion, thereby realizing the opening or closing of the moving contact and the stationary contact.

[0008] The intelligent drive control method for swing-arm disconnect switches includes the following steps:

[0009] S1. Obtain the drive parameters of the drive motor and the pre-contact electrical parameters of the moving contact;

[0010] S2. Compare the drive parameters and pre-contact electrical parameters with the corresponding preset reference characteristics, analyze the mechanical state of the transmission chain and the contact quality of the moving contact, determine whether the moving contact is safely closed, and issue a signal to lock the main circuit breaker when it is determined that the moving contact is not safely closed.

[0011] The intelligent drive control method for swing arm disconnect switches provided by this invention can comprehensively analyze the drive parameters of the drive motor and the pre-contact electrical parameters of the moving contact, and compare them with preset benchmark features, thereby comprehensively evaluating the mechanical state of the transmission chain and the contact quality of the moving contact. This effectively solves the limitation of traditional methods that rely solely on position information to determine the switch state, significantly improves the accuracy and reliability of the safe closing judgment of the disconnect switch, and avoids potential risks caused by poor contact.

[0012] Secondly, the present invention provides an intelligent drive control system for a swing arm disconnect switch, which is used to control the swing arm disconnect switch. The swing arm disconnect switch includes a drive motor, a gear, a swing arm and a moving contact connected in sequence. The gear, as a transmission chain, is driven by the drive motor to drive the swing arm to swing and the swing arm to drive the moving contact to perform linear reciprocating motion, thereby realizing the opening or closing of the moving contact and the stationary contact.

[0013] The intelligent drive control system for the swing arm disconnector includes:

[0014] The acquisition module is used to acquire the driving parameters of the drive motor and the pre-contact electrical parameters of the moving contact.

[0015] The control module is used to compare the drive parameters and pre-contact electrical parameters with the corresponding preset reference characteristics, analyze the mechanical state of the transmission chain and the contact quality of the moving contact, determine whether the moving contact is safely closed, and issue a signal to lock the main circuit breaker when it is determined that the moving contact is not safely closed.

[0016] As can be seen from the above, the intelligent drive control method for swing-arm disconnectors provided by this invention, by acquiring the drive parameters of the drive motor and the pre-contact electrical parameters of the moving contact, and comparing them with preset reference characteristics, can comprehensively and accurately analyze the mechanical state of the transmission chain and the contact quality of the moving contact. This method overcomes the limitations of existing technologies that rely solely on position information to determine the switch state, and effectively solves problems such as cumulative errors in the transmission chain caused by deterioration of lubricating oil performance and gear wear, insufficient contact closing pressure, and poor electrical contact. Through comprehensive evaluation of mechanical and electrical parameters, this application can accurately determine whether the moving contact is safely closed, and promptly lock the main circuit breaker when unsafe closing is detected, thereby significantly improving the reliability and safety of high-voltage disconnector operation, avoiding the risks of local overheating, arcing, and even line tripping, and has significant technological progress and practical value.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a flowchart of an intelligent drive control method for a swing-arm disconnector provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of a swing-arm disconnector in an embodiment of the present invention.

[0020] Figure 3This is a schematic diagram of a structure of an intelligent drive control system for a swing-arm disconnector provided in an embodiment of the present invention.

[0021] Label Explanation:

[0022] 1. Drive motor; 2. Gear; 3. Swing arm; 4. Moving contact; 5. Stationary contact; 100. Acquisition module; 200. Control module. Detailed Implementation

[0023] 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Reference Appendix Figure 1 and attached Figure 2 This invention provides an intelligent drive control method for a swing arm disconnector, used to control a swing arm disconnector (generally with functions of temperature measurement, current monitoring, moving contact position positioning, and AI intelligent monitoring camera). The swing arm disconnector includes a drive motor 1, a gear 2, a swing arm 3, and a moving contact 4 connected in sequence. The gear 2, as a transmission chain, is driven by the drive motor 1 to drive the swing arm 3 to swing, and the swing arm 3 drives the moving contact 4 to perform linear reciprocating motion, thereby realizing the opening or closing of the moving contact 4 and the stationary contact 5.

[0026] The intelligent drive control method for swing-arm disconnect switches includes the following steps:

[0027] S1. Obtain the drive parameters of the drive motor and the pre-contact electrical parameters of the moving contact; the drive parameters include the actual number of encoder pulses, the actual current curve and the actual power consumption curve of the drive motor, as well as the actual response mode of the speed change rate and acceleration of the drive motor at the moment of contact or separation of the moving contact and the stationary contact.

[0028] S2. Compare the drive parameters and pre-contact electrical parameters with the corresponding preset reference characteristics, analyze the mechanical state of the transmission chain and the contact quality of the moving contact, determine whether the moving contact is safely closed, and issue a signal to lock the main circuit breaker when it is determined that the moving contact is not safely closed; the preset reference characteristics include the encoder reference pulse number, current reference curve, power consumption reference curve and circuit resistance threshold of the drive motor, as well as the normal response mode of the drive motor speed change rate and acceleration at the moment of contact or separation of the moving contact and stationary contact; the current reference value includes the reference current peak value, reference current stable value and reference current rise rate.

[0029] This application obtains the drive parameters of the drive motor and the pre-contact electrical parameters of the moving contact, and compares them with preset reference characteristics. It can comprehensively analyze the mechanical state of the transmission chain and the contact quality of the moving contact, thereby accurately determining whether the moving contact is safely closed. If it is not safely closed, it can lock the main circuit breaker in time, effectively avoiding the problem of poor electrical contact caused by mechanical wear in traditional methods, and significantly improving the reliability and safety of the disconnecting switch operation.

[0030] The core of the intelligent drive control method for swing-arm disconnectors proposed in this application lies in the comprehensive and real-time monitoring and evaluation of the operating status of the swing-arm disconnector. A swing-arm disconnector is a common type of electrical equipment. Its working principle involves a transmission chain consisting of a drive motor, gears, a swing arm, and moving contacts to achieve the closing or opening action of the moving and stationary contacts. The drive motor is the core component providing power, and the gears and swing arm form a mechanical transmission chain that converts the rotational motion of the drive motor into the linear reciprocating motion of the moving contacts. The contact quality between the moving and stationary contacts directly affects the electrical performance and operational safety of the disconnector.

[0031] To accurately assess the operating status of the disconnector switch, this application first requires obtaining the drive parameters of the drive motor and the pre-contact electrical parameters of the moving contact. Drive parameters are key indicators reflecting the operating status of the drive motor and can include the actual number of encoder pulses, the actual current curve, and the actual power consumption curve. The actual number of encoder pulses reflects the actual rotation angle and position information of the drive motor. The actual current curve and power consumption curve reflect the load and energy consumption of the drive motor during operation. Furthermore, drive parameters can also include the actual response modes of the drive motor's speed change rate and acceleration at the moment of contact or separation between the moving and stationary contacts. These parameters capture the dynamic characteristics at the moment of contact. For example, the main controller (specifically a TIC2000 series DSP chip, adept at high-speed control and signal processing) calculates the rotational speed ω (ω=Δθ / Δt) and acceleration α (α=Δω / Δt) by performing differential calculations on the position signal provided by the position encoder, where Δθ is the change in rotational angle and Δt is the time interval. To smooth out noise in the data, Kalman filtering or moving average filtering algorithms can be used. For example, the formula for calculating rotational speed is ω(t) = (θ(t) - θ(t - Δt)) / Δt, and the formula for calculating acceleration is α(t) = (ω(t) - ω(t - Δt)) / Δt. When the contact is about to make contact with or separate from the stationary contact, due to the sudden change in mechanical load, wear and clearance of the transmission chain, the motor response will exhibit a brief nonlinearity, such as a sudden drop in rotational speed or a slowdown in the rate of increase. These phenomena are captured by high-frequency calculation of rotational speed and acceleration.

[0032] Pre-contact electrical parameters are mainly used to evaluate the quality of electrical contact between the moving contact and the stationary contact. For example, they can be obtained by measuring the actual loop resistance between the moving contact and the stationary contact.

[0033] After obtaining the above parameters, this application compares these driving parameters and pre-contact electrical parameters with preset reference characteristics. The preset reference characteristics are an ideal set of parameters for the disconnector switch under normal operating conditions, which may include the encoder reference pulse count of the drive motor, the current reference curve, the power consumption reference curve, and the loop resistance threshold, as well as the normal response mode of the drive motor's speed change rate and acceleration at the moment of contact or separation between the moving and stationary contacts. The current reference value can be further refined into the reference current peak value, the reference current stable value, and the reference current rise rate. By comparing the actual operating parameters with these reference characteristics, the mechanical state of the transmission chain and the contact quality of the moving contact can be analyzed. For example, if the actual power consumption curve is consistently higher than the power consumption reference curve, it may indicate abnormal friction or wear in the transmission chain. If the speed change rate or acceleration at the moment of contact of the moving contact deviates significantly from the normal response mode, it may indicate accumulated error or increased clearance in the transmission chain. If the actual loop resistance exceeds the loop resistance threshold, it indicates poor contact of the moving contact.

[0034] Based on the above comparative analysis results, this application can determine whether the moving contact is safely closed. If it is determined that the moving contact is not safely closed, the main circuit breaker will be immediately locked to prevent operation under load in an unsafe condition, thereby effectively avoiding potential electrical faults and safety accidents.

[0035] The intelligent drive control method for the swing-arm disconnector disclosed in this application works by real-time monitoring and intelligent analysis of multi-dimensional parameters during the operation of the disconnector, thereby achieving a comprehensive assessment of the mechanical condition and electrical contact quality of the disconnector.

[0036] Specifically, when the disconnector performs the closing action, the drive parameters of the drive motor and the pre-contact electrical parameters of the moving contact are first obtained through step S1. During the movement of the drive gear, swing arm, and moving contact, the encoder of the drive motor outputs the actual number of pulses in real time, reflecting the rotational position of the drive motor. Simultaneously, the current and power consumption of the drive motor are monitored in real time, forming actual current curves and actual power consumption curves. These curves reflect the operating characteristics of the drive motor under different loads. Furthermore, at the instant the moving contact is about to contact or just separates from the stationary contact, the actual response mode of the drive motor's speed change rate and acceleration is captured. These dynamic parameters are crucial for judging the impact and vibration characteristics during contact. To evaluate the electrical contact quality of the moving contact, the pre-contact electrical parameters of the moving contact are obtained when it is about to contact the stationary contact, for example, by measuring the actual loop resistance between the moving and stationary contacts using a specific test method.

[0037] Subsequently, in step S2, the acquired drive parameters and pre-contact electrical parameters are sent to the control module and compared with preset reference characteristics. These preset reference characteristics are ideal parameter models established through extensive experiments and historical data under normal operating conditions of the disconnector switch. For example, the encoder reference pulse count represents the ideal position when the moving contact is fully closed; the current reference curve and power consumption reference curve depict the changes in current and power consumption of the drive motor during normal closing; the loop resistance threshold sets the maximum allowable contact resistance between the moving and stationary contacts; and the normal response mode of the speed change rate and acceleration defines the ideal dynamic behavior at the moment of contact.

[0038] By comparing actual operating parameters with these benchmark characteristics, the control module can conduct in-depth analysis of the mechanical state of the drivetrain and the contact quality of the moving contacts. For example, if the actual power consumption curve is consistently higher than the power consumption benchmark curve during a certain stroke segment, it may indicate abnormal friction or wear in the drivetrain. If the actual rate of change of rotational speed at the moment of contact of the moving contact is lower than the normal rate of change of rotational speed, or the actual acceleration is higher than the normal acceleration, it may indicate cumulative error or increased clearance in the drivetrain, resulting in insufficient contact pressure of the moving contacts. If the actual loop resistance is greater than the loop resistance threshold, it directly indicates poor contact of the moving contacts.

[0039] Based on these analysis results, the control module determines whether the moving contact is safely closed. If any indicator deviates from the reference characteristics and is determined to be unsafely closed, the system will immediately lock the main circuit breaker. This locking mechanism effectively prevents load operation when the disconnecting switch is in an unsafe state, thereby avoiding serious accidents such as local overheating, arcing, or even line tripping caused by poor contact, mechanical failure, etc., greatly improving the operational reliability and safety of the power system.

[0040] The intelligent drive control method for swing-arm disconnectors proposed in this application represents a significant advancement compared to traditional technologies. Traditional disconnector control systems often rely solely on the position information of the drive motor to determine whether the switch is "in position." While simple, this method cannot effectively identify transmission chain errors and contact quality degradation caused by factors such as mechanical wear and lubricant deterioration. When there are accumulated errors in the transmission chain or insufficient contact pressure, even if the drive motor's position encoder indicates that the predetermined position has been reached, a tight and sufficient electrical contact may not be formed between the moving and stationary contacts. This can lead to excessive contact resistance, posing risks of localized overheating, arcing, or even line tripping.

[0041] This application introduces comprehensive monitoring of the drive parameters of the drive motor (including the actual number of encoder pulses, actual current curve, actual power consumption curve, and actual response modes of speed change and acceleration at the moment of contact) and the pre-contact electrical parameters of the moving contact (such as actual circuit resistance), and compares them with preset benchmark characteristics. This enables a comprehensive and real-time assessment of the mechanical state and electrical contact quality of the disconnecting switch. This multi-dimensional and refined monitoring and analysis method allows the system to accurately identify potential faults that are difficult to detect using traditional methods, such as abnormal friction, wear, cumulative errors, increased clearance in the transmission chain, and poor contact of the moving contact.

[0042] By promptly locking the main circuit breaker when the moving contact fails to close safely, this application effectively avoids operation under load in an unsafe state, thus fundamentally solving the safety hazards inherent in traditional control systems during load operation. This preventative control strategy significantly improves the reliability and safety of disconnector operation, reduces the probability of power system failures, and has significant technical contributions and practical value.

[0043] In some embodiments, step S2, which involves comparing the drive parameters and pre-contact electrical parameters with corresponding preset reference characteristics to analyze the mechanical state of the transmission chain and determine whether the moving contact is safely closed, includes:

[0044] S2A1. During the entire closing process, if there is a continuous stroke segment in the actual power consumption curve that is consistently higher than the power consumption reference curve (for example, exceeding the reference curve by 10%), it is determined that there is abnormal friction or wear in the transmission chain, and it is judged that the moving contact has not closed safely; otherwise, proceed to step S2A2.

[0045] S2A2. At the moment of closing, if the rate of change of speed in the actual response mode is lower than that in the normal response mode, or the acceleration in the actual response mode is higher than that in the normal response mode, it is determined that there is a cumulative error or increased clearance in the transmission chain, resulting in insufficient contact pressure of the moving contact and poor contact (if obvious "hysteresis" (e.g., a 20% increase in speed drop time) or "jitter" (e.g., acceleration fluctuation exceeding 30% of the normal value) is detected, it indicates that there is a cumulative error or increased clearance in the transmission chain, which may lead to insufficient actual contact pressure), it is determined that the moving contact has not closed safely; otherwise, proceed to step S2A3;

[0046] S2A3. After closing, if the actual number of encoder pulses does not reach the encoder reference number of pulses, it is determined that the moving contact has not reached the preset theoretical closing position, and the moving contact is not safely closed; otherwise, the moving contact is safely closed.

[0047] Specifically, in step S2A1, by monitoring and comparing the actual power consumption curve of the drive motor throughout the entire closing process with the reference power consumption curve, abnormal resistance within the transmission chain can be effectively identified. For example, when bearings are worn, gears are poorly meshed, or lubrication is insufficient, the drive motor needs to consume more energy to overcome these additional frictional forces, causing the actual power consumption curve to remain higher than the reference power consumption curve for a certain stroke segment. This continuous increase in power consumption is direct evidence of abnormal friction or wear in the transmission chain.

[0048] In step S2A2, the closing instant refers to the extremely short time interval during which the moving contact and the stationary contact are about to make contact or have just made contact. At this critical moment, by analyzing the differences between the actual response patterns and normal response patterns of the drive motor's speed change rate and acceleration, cumulative errors or clearance problems in the transmission chain can be diagnosed. For example, if the speed change rate is lower than normal, it may mean that the drive motor exhibits sluggishness or insufficient power in overcoming contact resistance; if the acceleration is higher than normal, it may indicate excessive clearance in the transmission chain, leading to impact or instability. These abnormal response patterns can all result in insufficient contact pressure of the moving contact, thus causing poor contact.

[0049] In practical applications, in step S2A3, the actual number of encoder pulses is a key indicator for measuring the actual position of the moving contact. After closing, the moving contact should accurately reach the preset theoretical closing position, which corresponds to a specific encoder reference pulse count. If the actual pulse count does not reach this reference value, it indicates that the moving contact has not fully reached its position, which may be due to mechanical jamming, stroke obstruction, or other positioning errors, thus leading to unsafe closing.

[0050] This application's solution comprehensively and accurately assesses the mechanical condition of the drive chain of a swing-arm disconnector by monitoring and analyzing the operating parameters of the drive motor in stages and from multiple dimensions. First, by comparing the actual power consumption curve with the baseline power consumption curve throughout the closing process, abnormal friction or wear in the drive chain can be detected in real time, providing an early warning of the drive chain's health status. Second, at the moment of closing, by analyzing the actual response patterns of the drive motor's speed change rate and acceleration, accumulated errors or increased clearances in the drive chain can be identified. These issues directly affect the contact quality between the moving and stationary contacts. Finally, by checking whether the actual number of encoder pulses after closing reaches the baseline value, it ensures that the moving contact accurately reaches the preset theoretical closing position, avoiding safety hazards caused by inaccurate positioning. This step-by-step, refined diagnostic mechanism allows the system to capture potential faults in the drive chain from different angles, thereby improving the accuracy and timeliness of fault diagnosis.

[0051] Through the above technical solution, this application can significantly improve the accuracy and comprehensiveness of the intelligent drive control method for swing-arm disconnectors in analyzing the mechanical state of the transmission chain. This solution can not only detect abnormal friction or wear in the transmission chain at an early stage, but also identify insufficient contact pressure caused by accumulated errors or increased gaps at the critical closing moment, ultimately confirming whether the moving contact is precisely in place. Compared to traditional methods that rely on only a single parameter or make rough judgments, this solution, through multi-stage, multi-parameter comprehensive comparative analysis, effectively avoids the risk of unsafe closing of the moving contact due to abnormal mechanical state, thereby significantly improving the reliability and safety of the disconnector operation and reducing equipment failure rate and maintenance costs.

[0052] In some embodiments, step S1, the step of obtaining the pre-contact electrical parameters of the moving contact, includes:

[0053] When the moving contact performs the closing action and the distance between the moving contact and the stationary contact reaches the preset value (closed), the drive motor is controlled to brake, and a low-voltage weak current test is performed on the moving contact and the stationary contact through a preset test circuit to obtain the actual circuit resistance between the moving contact and the stationary contact, which is used as the pre-contact electrical parameter.

[0054] The phrase "when the moving contact performs the closing action and the distance between the moving contact and the stationary contact reaches the preset value" can be understood as the critical moment when the moving contact of the swing-arm disconnector is moving towards the stationary contact, about to make contact but not yet fully closed. This preset value can be set according to the specific model, structure, and safety operation requirements of the disconnector; for example, the preset value is 5 mm.

[0055] "Controlling the drive motor to brake" refers to sending a braking command to the drive motor through the control system at the aforementioned critical moment, so as to stop or slow down its movement, thereby ensuring that the moving contact is in a relatively stable state when performing electrical parameter tests and avoiding measurement errors caused by movement.

[0056] "Passing the preset test circuit" refers to using a specially designed electrical circuit, independent of the main circuit, to perform electrical tests on the moving and stationary contacts without affecting the safe operation of the main circuit. For example, this circuit includes an independent low-voltage DC power supply (e.g., 5V), a current-limiting resistor (e.g., 100 ohms), and a high-precision digital multimeter for measuring the loop resistance between the moving and stationary contacts. The test current is set in the milliampere range (e.g., 50mA). If the measured actual loop resistance exceeds a preset threshold (e.g., 100 microohms), it is considered abnormal.

[0057] "Low-voltage, weak-current testing of the moving and stationary contacts" refers to injecting a low-amplitude, low-current test into the space between the moving and stationary contacts through the aforementioned test circuit. This test current is characterized by not causing damage to the contact surface of the disconnector switch, nor causing a significant increase in contact temperature, thus ensuring the safety and accuracy of the test. This low-voltage, weak-current test avoids safety risks under high-voltage conditions and can effectively detect early contact failures caused by oxidation, dirt, or insufficient contact pressure. These problems are particularly prominent in high-voltage disconnectors when transmission chain errors are caused by lubricating oil deterioration and gear wear.

[0058] This application's solution involves controlling the drive motor to brake at the critical moment when the moving and stationary contacts are about to close, and using a preset test circuit to perform a low-voltage, weak current test to obtain the actual circuit resistance between the moving and stationary contacts. This method overcomes the limitation of traditional solutions that cannot accurately obtain the electrical connection quality between the moving and stationary contacts before closing. By conducting the test before the moving contact is fully closed, the influence of mechanical impact or arcing that may occur after the contacts are fully in contact on the measurement results can be avoided, ensuring that the obtained actual circuit resistance can truly reflect the electrical characteristics of the contacts in the pre-contact state. In addition, the use of low-voltage, weak current testing can effectively avoid any form of damage to the disconnecting switch, ensuring the safety of the testing process. Thus, key electrical parameters can be obtained before the moving contact is fully closed, providing timely and reliable data support for subsequent judgment of closing quality.

[0059] Through the above technical solution, this application enables early and accurate assessment of the electrical connection quality between the moving and stationary contacts of a swing-arm disconnector when it is about to close. Compared to testing only after closing or using imprecise estimation methods, this solution significantly improves the ability to predict potential contact problems by accurately measuring the actual circuit resistance before the moving and stationary contacts actually make contact. This proactive detection mechanism allows the control system to detect and handle abnormalities in a timely manner before the moving contact is fully closed, thereby effectively avoiding equipment damage, operational failures, or safety accidents caused by poor contact, and greatly improving the reliability and safety of the disconnector operation.

[0060] In some embodiments, step S2, which involves comparing the driving parameters and pre-contact electrical parameters with corresponding preset reference characteristics to analyze the contact quality of the moving contact and determine whether the moving contact is safely closed, includes:

[0061] S2B1. Before closing the circuit, if the actual circuit resistance is greater than the circuit resistance threshold (e.g., 100 microohms), it is determined that the moving contact is not in good contact and the moving contact is not safely closed; otherwise, proceed to step S2B2.

[0062] S2B2. During the closing process, if the actual current curve is less than the reference current peak value (e.g., 5% lower than the reference current peak value), or less than the reference current stable value, or greater than the reference current rise rate, it is determined that the moving contact pressure is insufficient, resulting in poor contact, and the moving contact is judged to have not closed safely; otherwise, proceed to step S2B3.

[0063] S2B3. After closing, if the actual number of encoder pulses does not reach the encoder reference number of pulses, it is determined that the moving contact has not reached the preset theoretical closing position, and the moving contact is not safely closed; otherwise, the moving contact is safely closed.

[0064] Specifically, in step S2B1, during the stage when the moving contact and stationary contact are about to make contact but have not yet fully closed, the actual circuit resistance between the moving and stationary contacts is measured and compared with a preset circuit resistance threshold. The actual circuit resistance refers to the resistance value of the electrical circuit formed between the moving and stationary contacts under low-voltage, low-current testing. The circuit resistance threshold is a preset upper limit value based on the circuit resistance characteristics under normal closing conditions. If the actual circuit resistance exceeds this threshold, it indicates that there may be oxidation, dirt, or other physical obstacles on the contact surface between the moving and stationary contacts, resulting in excessive contact resistance, and is thus determined to be poor contact of the moving contact.

[0065] In step S2B2, as the moving contact continues to complete the closing action, the actual current curve of the drive motor 1 is monitored and analyzed in real time. The actual current curve reflects the load changes experienced by the drive motor 1 during the closing process. The reference current peak value, reference current stable value, and reference current rise rate are preset reference values ​​based on the current characteristics during normal closing. If the peak value of the actual current curve at the moment of closing is lower than the reference current peak value, or the current value after stable contact is lower than the reference current stable value, or the current rise rate is abnormally greater than the reference current rise rate, it may indicate insufficient contact pressure between the moving contact and the stationary contact. Insufficient contact pressure will lead to increased contact resistance, affecting current transmission efficiency, and even causing local overheating.

[0066] In practical applications, in step S2B3, after the moving contact completes the closing action, the actual number of encoder pulses is obtained through the encoder of the drive motor 1. The actual number of encoder pulses reflects the rotation angle of the drive motor 1, and thus the final closing position of the moving contact 4 can be calculated. The encoder reference pulse number is preset based on the encoder pulse number corresponding to when the moving contact 4 reaches the preset theoretical closing position. If the actual number of encoder pulses does not reach the encoder reference pulse number, it indicates that the moving contact 4 has not fully reached its theoretical closing position, and there may be a situation where the closing is not complete. This will also be judged as the moving contact not being safely closed.

[0067] This application's solution comprehensively evaluates the contact quality of the moving contact 4 by performing multi-dimensional and detailed monitoring and comparison of its electrical and mechanical parameters at different stages of the closing process. Specifically, before closing, by detecting whether the actual circuit resistance exceeds the circuit resistance threshold, it is possible to promptly identify any initial contact problems between the moving contact 4 and the stationary contact 5, such as surface oxidation or foreign matter, thus preventing arcing or overheating during energized closing. During the closing process, by analyzing the deviation between the actual current curve and the reference current value, it is possible to accurately determine whether the contact pressure between the moving contact 4 and the stationary contact 5 is sufficient. A current peak and stable value that are too low, or a current rise rate that is too fast, are typical signs of insufficient contact pressure, which may lead to excessive contact resistance and affect conductivity. After closing, by comparing the actual number of encoder pulses with the encoder reference number of pulses, it is possible to verify whether the moving contact 4 has accurately reached the preset theoretical closing position, ensuring the mechanical closing is in place. These phased, multi-parameter detection mechanisms complement each other, jointly constructing a rigorous contact quality evaluation system that effectively overcomes the limitations of single-parameter detection.

[0068] Through the above technical solution, this application enables a more comprehensive, accurate, and real-time diagnosis of the contact quality of the moving contact 4 of a swing-arm disconnector. This solution not only predicts potential contact defects before closing but also dynamically assesses contact pressure during closing and confirms the accuracy of the final position after closing. This significantly improves the reliability and safety of the disconnector's closing action, effectively preventing equipment failures, power grid accidents, or safety hazards caused by poor contact, insufficient contact pressure, or incomplete closing. Furthermore, through continuous monitoring and comparison of these key parameters, this application can also provide data support for preventative maintenance of the disconnector, extending equipment lifespan and reducing operation and maintenance costs.

[0069] In some embodiments, the step of performing a low-voltage, weak-current test on the moving contact and the stationary contact using a preset test circuit to obtain the actual circuit resistance between the moving contact and the stationary contact includes:

[0070] C1. Through the test circuit, inject a low-voltage, weak current with a specific modulation frequency between the moving contact and the stationary contact;

[0071] C2. Measure the actual voltage drop generated by the injection of a weak low-voltage current in different areas of the contact surface between the moving contact and the stationary contact;

[0072] C3. Based on the injected low-voltage weak current and the actual voltage drop in each region, calculate the loop resistance of each region to obtain the actual loop resistance between the moving contact and the stationary contact.

[0073] Specifically, in step C1, the test circuit can be understood as an electrical path specifically designed for low-voltage, weak-current testing, aiming to provide a stable and controllable current injection environment. The low-voltage, weak current injected between the moving and stationary contacts is set at a level that will not cause any damage to the disconnector or surrounding equipment, while ensuring effective detection of the electrical characteristics of the contact surfaces. This current is given a specific modulation frequency, such as a sine wave or square wave modulation, to effectively filter out noise such as DC drift and power frequency interference in the environment through subsequent demodulation processing, thereby improving the signal-to-noise ratio and accuracy of the measurement signal.

[0074] Further, in step C2, the actual voltage drop generated by the injected low-voltage weak current flowing through different regions of the contact surface between the moving and stationary contacts is measured. Specifically, the different regions of the contact surface refer to multiple discrete or continuous sub-regions where the moving and stationary contacts may form an electrical connection when the circuit is closed. For example, multiple measurement points or regions can be preset on the contact surface, and an independent voltage measurement probe can be configured for each region. By measuring the voltage drop in these regions separately, the electrical characteristics of each part of the contact surface can be obtained, thereby more comprehensively evaluating the uniformity and integrity of the contact quality. For example, when the moving contact performs the closing action and the distance between the moving and stationary contacts reaches a preset value, the drive motor is controlled to brake. At this time, an independent low-voltage DC test circuit is activated, which includes a 5V DC power supply and a current-limiting resistor, injecting a constant DC current of 50mA between the moving and stationary contacts. Three miniature voltage measurement probes are evenly arranged along the length of the contact surface between the moving and stationary contacts, located on the left, middle, and right sides of the contact surface, respectively. Each probe independently measures the voltage drop in its respective region. For example, the left probe measured a voltage drop of 2.5mV, the middle probe measured a voltage drop of 3.0mV, and the right probe measured a voltage drop of 2.8mV. Based on the injected 50mA current and the voltage drops in each region, the loop resistance of each region was calculated: the resistance of the left region was 50 microohms (2.5mV / 50mA), the resistance of the middle region was 60 microohms (3.0mV / 50mA), and the resistance of the right region was 56 microohms (2.8mV / 50mA). These resistance values ​​of each region are collectively used as the actual loop resistance between the moving and stationary contacts for subsequent contact quality assessment.

[0075] Therefore, in step C3, based on the injected low-voltage weak current and the actual voltage drop in each region, the loop resistance of each region is calculated to obtain the actual loop resistance between the moving and stationary contacts. Specifically, the loop resistance of each region can be calculated according to Ohm's law, that is, resistance equals voltage drop divided by current. By calculating the loop resistance of different regions, a resistance distribution diagram reflecting the electrical connection status of the entire contact surface or multiple independent resistance values ​​can be obtained. These values ​​together constitute the actual loop resistance between the moving and stationary contacts, the purpose of which is to provide refined data support for subsequent contact quality analysis.

[0076] This application's solution effectively overcomes the limitations of traditional single-current testing methods in assessing noise interference and contact surface non-uniformity by introducing a low-voltage, weak current with a specific modulation frequency and combining it with voltage drop measurements in different regions of the contact surface between the moving and stationary contacts. The use of a specific modulation frequency for current injection allows for the separation of the target measurement signal from complex noise backgrounds during subsequent signal processing through techniques such as synchronous demodulation, significantly improving the accuracy and anti-interference capability of the measurement results. Furthermore, by measuring the voltage drop in different regions of the contact surface and calculating the loop resistance of each region, the assessment of the electrical connection quality between the moving and stationary contacts is no longer limited to a single, potentially biased average value, but rather provides a detailed reflection of the actual condition of each part of the contact surface. This regional measurement and calculation effectively identifies potential problems such as poor contact, localized overheating, or wear, providing a more accurate data foundation for subsequent fault diagnosis and maintenance.

[0077] Through the above technical solution, this application provides a more accurate and robust method for obtaining the actual loop resistance between the moving and stationary contacts. Compared to the basic solution, this solution effectively suppresses the influence of environmental noise on the measurement results by introducing current injection at a specific modulation frequency, significantly improving the reliability of the data. Furthermore, by measuring and calculating in different areas of the contact surface, the electrical connection quality of the entire contact surface can be comprehensively and meticulously evaluated, promptly identifying local contact defects or unevenness, thus avoiding misjudgments that may result from a single overall measurement. This refined method of obtaining loop resistance provides more accurate pre-contact electrical parameters for the intelligent drive control of the swing-arm disconnector, thereby improving the accuracy and reliability of the moving contact's safe closing judgment and effectively ensuring the operational safety and stability of the disconnector.

[0078] In some embodiments, the specific steps in step C2 include:

[0079] C21. After arranging a pair of differential voltage measuring probes in different areas of the contact surface between the moving contact and the stationary contact, the differential voltage signals of each area are synchronously collected through the differential voltage measuring probes.

[0080] C22. The differential voltage signals collected from each region are demodulated in sync with a specific modulation frequency to obtain the actual voltage drop of each region.

[0081] The differential voltage measurement probe is configured to measure the voltage difference between two test points. Its advantage lies in its ability to effectively suppress common-mode noise, thereby improving the accuracy and anti-interference capability of voltage measurements. Differential voltage measurement probes are deployed in different areas of the contact surface between the moving and stationary contacts to measure voltage drop at multiple key points on the contact surface. This allows for a comprehensive assessment of the electrical connection status of the entire contact surface and the identification of potential localized poor contact or abnormal resistance areas. Synchronous acquisition of differential voltage signals from each area means acquiring voltage signals from different areas at the same time or in a strictly time-synchronized manner. This helps maintain the phase and time relationship between the measurement data, providing a basis for subsequent accurate analysis.

[0082] Furthermore, demodulation processing of the differential voltage signals collected from each region, synchronized with a specific modulation frequency, refers to processing the collected composite signal containing test signals and noise using demodulation techniques synchronized with the specific modulation frequency used by the injected low-voltage weak current. The purpose of demodulation processing is to extract the actual voltage drop information generated by the required low-voltage weak current flow from the carrier signal, while effectively filtering out environmental noise and interference. Through this synchronous demodulation processing, the signal-to-noise ratio of the signal can be significantly improved, ensuring accurate acquisition of the weak actual voltage drop signal even under complex electromagnetic environments such as industrial sites.

[0083] This application's solution, by arranging differential voltage measurement probes in different areas of the contact surface between the moving and stationary contacts and simultaneously acquiring differential voltage signals, can obtain voltage drop information at multiple points on the contact surface, thereby achieving a comprehensive assessment of contact quality. Simultaneously, by demodulating the acquired signals in sync with a specific modulation frequency, environmental noise and interference can be effectively suppressed, accurately extracting the actual voltage drop from weak test signals, overcoming the accuracy limitations of traditional voltage measurement methods in environments with strong interference. Therefore, this solution can provide more accurate and reliable raw data for subsequent loop resistance calculations.

[0084] The above technical solution allows for more accurate and reliable actual voltage drop data. This enables more precise calculation of the actual circuit resistance between the moving and stationary contacts, allowing for a more detailed analysis of the moving contact's contact quality. It also facilitates the timely detection and diagnosis of potential problems such as poor contact, localized overheating, or wear, significantly improving the diagnostic accuracy and reliability of the intelligent drive control method for swing-arm disconnectors.

[0085] In some embodiments, the specific steps in step C22 include:

[0086] C221. Generate in-phase and quadrature-phase reference signals that are synchronized with a specific modulation frequency, based on that specific modulation frequency;

[0087] C222. Real-time monitoring of the instantaneous amplitude of the differential voltage signal collected in each area, and when the instantaneous amplitude exceeds the preset pulse threshold, it is identified as an instantaneous high-energy pulse interference event, and the sampled data of the differential voltage signal collected in each area during the instantaneous high-energy pulse interference event are marked;

[0088] C223. Multiply the differential voltage signals collected in each region with the in-phase reference signal and the quadrature phase reference signal respectively to obtain the multiplication results;

[0089] C224. Perform low-pass filtering on the multiplication results. During the low-pass filtering process, assign a lower weight to the multiplication results corresponding to the labeled differential voltage signal sampling data than to the multiplication results corresponding to the unlabeled sampling data to obtain the actual voltage drop of each region.

[0090] Specifically, in step C221, the in-phase reference signal and the quadrature-phase reference signal are key signals used for synchronous demodulation. They are strictly synchronized with the specific modulation frequency of the injected low-voltage weak current, and are typically sine and cosine waveforms. These reference signals can be generated by a digital signal processor or microcontroller through methods such as lookup tables or direct digital frequency synthesis.

[0091] In step C222, the instantaneous amplitude refers to the instantaneous voltage value of the differential voltage signal collected in each area at a certain moment. The preset pulse threshold is an upper limit of voltage amplitude determined based on experience or experimentation, used to distinguish between normal signal fluctuations and instantaneous high-energy pulse interference. When the instantaneous amplitude of the differential voltage signal suddenly exceeds this threshold significantly, it is identified as an instantaneous high-energy pulse interference event. Marking the sampled data during the interference event is to enable subsequent processing to identify and differentiate these contaminated data.

[0092] In step C223, the multiplication operation is the core operation of synchronous demodulation. By multiplying the acquired differential voltage signal with the in-phase reference signal and the quadrature-phase reference signal respectively, the useful information of the modulated signal can be separated from the carrier and converted into a DC component.

[0093] In step C224, the low-pass filtering process aims to remove high-frequency components from the multiplication result and extract the DC component representing the actual voltage drop. During this process, the multiplication result corresponding to the labeled differential voltage signal sampling data is assigned a lower weight than the multiplication result corresponding to the unlabeled sampling data. This means that during filtering calculations (e.g., averaging, integration), the influence of disturbed data points on the final result is significantly weakened. For example, unlabeled data can be assigned a weight of 1, while labeled data can be assigned a weight of 0.1 or less, or even 0, thereby effectively suppressing the negative impact of instantaneous high-energy pulse interference on the calculation of the actual voltage drop.

[0094] This application's solution effectively addresses the insufficient accuracy of traditional demodulation methods in strong interference environments by introducing a mechanism for identifying and weighting instantaneous high-energy pulse interference. Specifically, during synchronous demodulation, an in-phase reference signal and a quadrature-phase reference signal synchronized with a specific modulation frequency are first generated, ensuring a foundation for accurate extraction of the useful signal. Based on this, by real-time monitoring of the instantaneous amplitude of the differential voltage signal and setting a preset pulse threshold, instantaneous high-energy pulse interference events caused by the external environment can be identified promptly and accurately. Once interference is identified, the system marks the affected differential voltage signal sampling data. Subsequently, after multiplying the differential voltage signal with the reference signal, the system assigns different weights to the multiplication result during low-pass filtering based on whether the data is marked. Marked, interfered data points are assigned lower weights, meaning their contribution to the final result in the filtering calculation is significantly reduced, or even negligible. This weighted processing mechanism enables the demodulation process to effectively suppress the negative impact of instantaneous high-energy pulse interference on the actual voltage drop calculation, thereby ensuring that high-precision actual voltage drop data can be obtained even in complex electromagnetic environments.

[0095] Through the above technical solution, this application can significantly improve the accuracy and reliability of measuring the actual voltage drop between the moving and stationary contacts in environments with strong electromagnetic interference. Especially in the presence of instantaneous high-energy pulse interference, this solution effectively avoids measurement errors caused by interference in traditional demodulation methods by intelligently identifying and weakening the impact of interference data, thus ensuring the accuracy of subsequent loop resistance calculations. Consequently, the judgment of the moving contact quality will be more accurate, reducing the risk of misjudgment and further improving the overall performance and safety of the intelligent drive control method for swing-arm disconnectors.

[0096] Reference Appendix Figure 3 This invention provides an intelligent drive control system for a swing arm disconnector (the intelligent drive control system for the swing arm disconnector adopts the intelligent drive control method for the swing arm disconnector described in the above embodiment, and the specific process is referred to the corresponding steps above), for controlling the swing arm disconnector. The swing arm disconnector includes a drive motor, a gear, a swing arm, and a moving contact connected in sequence. The gear, as a transmission chain, is used to drive the swing arm to swing under the drive of the drive motor, and the swing arm drives the moving contact to perform linear reciprocating motion, thereby realizing the opening or closing of the moving contact and the stationary contact.

[0097] The intelligent drive control system for the swing arm disconnector includes:

[0098] The acquisition module 100 is used to acquire the driving parameters of the drive motor and the pre-contact electrical parameters of the moving contact.

[0099] The control module 200 is used to compare the drive parameters and pre-contact electrical parameters with the corresponding preset reference characteristics, analyze the mechanical state of the transmission chain and the contact quality of the moving contact, determine whether the moving contact is safely closed, and issue a signal to lock the main circuit breaker when it is determined that the moving contact is not safely closed.

[0100] The acquisition module can be a standalone hardware unit, such as a data acquisition card, embedded controller, or programmable logic controller (PLC), equipped with various sensor interfaces for connecting encoders, current sensors, power consumption sensors, and test equipment for measuring pre-contact electrical parameters of the drive motor. This module is responsible for acquiring, converting, and pre-processing these analog or digital signals to form drive parameters and pre-contact electrical parameters that can be analyzed by the control module. As one implementation, the acquisition module can use a periodic polling method, reading data from various sensors at regular intervals. Another implementation is that the acquisition module can be configured in an event-triggered mode, initiating data acquisition only during specific operational phases (e.g., the start of closing action or when contacts are about to make contact) to optimize resource utilization.

[0101] The control module can be a hardware platform such as a microprocessor, digital signal processor (DSP), field-programmable gate array (FPGA), or industrial computer, running preset algorithms and logic programs internally. This module receives drive parameters and pre-contact electrical parameters transmitted by the acquisition module and compares them with preset reference features stored in its internal memory. The comparison process can employ various methods, such as simple threshold judgment, curve fitting analysis, or pattern recognition. For example, the control module can simply perform a point-to-point comparison between the actual parameters and the reference parameters, or calculate the area difference between the actual curve and the reference curve. When it is determined that the moving contact has not safely closed, the control module sends a locking command to the main circuit breaker through its output interface. This command can be a simple switching signal or a control command based on a communication protocol. As one implementation, the control module can adopt a centralized architecture, where all comparison and judgment logic is completed on a single processor. Another implementation is a distributed architecture, where different analysis tasks are distributed to multiple processing units for parallel execution, improving processing efficiency and system response speed.

[0102] In some embodiments, the control module 200 performs the following actions when comparing the drive parameters and pre-contact electrical parameters with corresponding preset reference characteristics, analyzing the mechanical state of the transmission chain, and determining whether the moving contact is safely closed:

[0103] S2A1. During the entire closing process, if there is a continuous stroke segment in the actual power consumption curve that is consistently higher than the power consumption reference curve, it is determined that there is abnormal friction or wear in the transmission chain, and it is judged that the moving contact has not closed safely; otherwise, proceed to step S2A2.

[0104] S2A2. At the moment of closing, if the rate of change of speed in the actual response mode is lower than the rate of change of speed in the normal response mode, or the acceleration in the actual response mode is higher than the acceleration in the normal response mode, it is determined that there is a cumulative error in the transmission chain or the gap is increased, resulting in insufficient contact pressure of the moving contact and poor contact, and it is judged that the moving contact has not closed safely; otherwise, proceed to step S2A3.

[0105] S2A3. After closing, if the actual number of encoder pulses does not reach the encoder reference number of pulses, it is determined that the moving contact has not reached the preset theoretical closing position, and the moving contact is not safely closed; otherwise, the moving contact is safely closed.

[0106] In some embodiments, the acquisition module 100 performs the following when acquiring the pre-contact electrical parameters of the moving contact:

[0107] When the moving contact performs the closing action and the distance between the moving contact and the stationary contact reaches the preset value, the drive motor is controlled to brake, and a low-voltage weak current test is performed on the moving contact and the stationary contact through a preset test circuit to obtain the actual circuit resistance between the moving contact and the stationary contact, which is used as the pre-contact electrical parameter.

[0108] In some embodiments, the control module 200 performs the following actions when comparing the drive parameters and pre-contact electrical parameters with corresponding preset reference characteristics, analyzing the contact quality of the moving contact, and determining whether the moving contact is safe to close:

[0109] S2B1. Before closing the circuit, if the actual circuit resistance is greater than the circuit resistance threshold, it is determined that the moving contact is not in good contact and the moving contact is not safely closed; otherwise, proceed to step S2B2.

[0110] S2B2. During the closing process, if the actual current curve is less than the reference current peak value, or less than the reference current stable value, or greater than the reference current rise rate, it is determined that the moving contact pressure is insufficient, resulting in poor contact, and the moving contact is judged to have not closed safely; otherwise, proceed to step S2B3.

[0111] S2B3. After closing, if the actual number of encoder pulses does not reach the encoder reference number of pulses, it is determined that the moving contact has not reached the preset theoretical closing position, and the moving contact is not safely closed; otherwise, the moving contact is safely closed.

[0112] In some embodiments, the acquisition module 100 is executed when performing a low-voltage, weak current test on the moving contact and the stationary contact through a preset test circuit to obtain the actual circuit resistance between the moving contact and the stationary contact:

[0113] C1. Through the test circuit, inject a low-voltage, weak current with a specific modulation frequency between the moving contact and the stationary contact;

[0114] C2. Measure the actual voltage drop generated by the injection of a weak low-voltage current in different areas of the contact surface between the moving contact and the stationary contact;

[0115] C3. Based on the injected low-voltage weak current and the actual voltage drop in each region, calculate the loop resistance of each region to obtain the actual loop resistance between the moving contact and the stationary contact.

[0116] In some embodiments, the acquisition module 100 is used to perform the following when measuring the actual voltage drop generated by the injected low-voltage weak current flowing through different regions of the contact surface between the moving contact and the stationary contact:

[0117] C21. After arranging a pair of differential voltage measuring probes in different areas of the contact surface between the moving contact and the stationary contact, the differential voltage signals of each area are synchronously collected through the differential voltage measuring probes.

[0118] C22. The differential voltage signals collected from each region are demodulated in sync with a specific modulation frequency to obtain the actual voltage drop of each region.

[0119] In some embodiments, the acquisition module 100 performs the following steps when demodulating the differential voltage signals acquired from each region in sync with a specific modulation frequency to obtain the actual voltage drop of each region:

[0120] C221. Generate in-phase and quadrature-phase reference signals that are synchronized with a specific modulation frequency, based on that specific modulation frequency;

[0121] C222. Real-time monitoring of the instantaneous amplitude of the differential voltage signal collected in each area, and when the instantaneous amplitude exceeds the preset pulse threshold, it is identified as an instantaneous high-energy pulse interference event, and the sampled data of the differential voltage signal collected in each area during the instantaneous high-energy pulse interference event are marked;

[0122] C223. Multiply the differential voltage signals collected in each region with the in-phase reference signal and the quadrature phase reference signal respectively to obtain the multiplication results;

[0123] C224. Perform low-pass filtering on the multiplication results. During the low-pass filtering process, assign a lower weight to the multiplication results corresponding to the labeled differential voltage signal sampling data than to the multiplication results corresponding to the unlabeled sampling data to obtain the actual voltage drop of each region.

[0124] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0125] The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A swing-arm isolator intelligent drive control method for controlling a swing-arm isolator, characterized in that, The swing-arm isolating switch comprises a driving motor, a gear, a swing arm and a moving contact connected in sequence, the gear as a transmission chain is used to drive the swing arm to swing and drive the moving contact to make linear reciprocating motion through the swing arm under the driving of the driving motor, so as to realize the opening or closing of the moving contact and the static contact; The intelligent driving control method of the swing-arm isolating switch comprises the following steps: S1. obtaining driving parameters of the driving motor and pre-contact electrical parameters of the moving contact; S2. comparing the driving parameters and the pre-contact electrical parameters with corresponding preset reference characteristics, analyzing the mechanical state of the transmission chain and the contact quality of the moving contact, judging whether the moving contact is safely closed, and issuing a signal to lock the main circuit breaker when it is judged that the moving contact is not safely closed; the driving parameters include actual pulse number of the encoder of the driving motor, actual current curve and actual power consumption curve, and actual response mode of the driving motor's speed change rate and acceleration at the moment of contact or separation of the moving contact and the static contact; the preset reference characteristics include reference pulse number of the encoder of the driving motor, reference current reference value, reference power consumption curve and circuit resistance threshold, and normal response mode of the driving motor's speed change rate and acceleration at the moment of contact or separation of the moving contact and the static contact; the reference current reference value includes reference current peak value, reference current stable value and reference current rising rate; In step S1, the step of obtaining the pre-contact electrical parameters of the moving contact comprises: When the moving contact performs the closing action and the distance between the moving contact and the static contact reaches a preset value, the driving motor is controlled to brake, and a low-voltage weak current test is performed on the moving contact and the static contact through a preset test circuit to obtain the actual circuit resistance between the moving contact and the static contact as the pre-contact electrical parameters; In step S2, the step of comparing the driving parameters and the pre-contact electrical parameters with corresponding preset reference characteristics, analyzing the contact quality of the moving contact, and judging whether the moving contact is safely closed comprises: S2B1. Before the closing is completed, if the actual circuit resistance is greater than the circuit resistance threshold, it is determined that the moving contact is in poor contact, and it is judged that the moving contact is not safely closed; otherwise, step S2B2 is performed; S2B2. During the completion of the closing, if the actual current curve is less than the reference current peak value, or less than the reference current stable value, or greater than the reference current rising rate, it is determined that the moving contact is in poor contact due to insufficient contact pressure, and it is judged that the moving contact is not safely closed; otherwise, step S2B3 is performed; S2B3. After the closing is completed, if the actual pulse number of the encoder does not reach the reference pulse number of the encoder, it is determined that the moving contact does not reach the preset theoretical closing position, and it is judged that the moving contact is not safely closed; otherwise, it is judged that the moving contact is safely closed.

2. The swing-arm isolating switch intelligent drive control method according to claim 1, characterized in that, In step S2, the step of comparing the driving parameters and the pre-contact electrical parameters with corresponding preset reference characteristics, analyzing the mechanical state of the transmission chain, and judging whether the moving contact is safely closed comprises: S2A1. During the entire closing process, if there is a continuous stroke segment in the actual power consumption curve that is continuously higher than the reference power consumption curve, it is determined that there is abnormal friction or wear in the transmission chain, and it is judged that the moving contact is not safely closed; otherwise, step S2A2 is performed; S2A2. If the actual power consumption curve is less than the reference power consumption curve, it is determined that the transmission chain is in good condition, and it is judged that the moving contact is safely closed. S2A2. At the moment of closing, if the rate of change of speed in the actual response mode is lower than the rate of change of speed in the normal response mode, or the acceleration in the actual response mode is higher than the acceleration in the normal response mode, it is determined that there is accumulated error or gap increase in the transmission chain, which leads to insufficient contact pressure of the moving contact, resulting in poor contact, and it is judged that the moving contact is not safely closed; otherwise, step S2A3 is performed; S2A3. After closing is completed, if the actual number of pulses of the encoder does not reach the reference number of pulses of the encoder, it is determined that the moving contact does not reach the preset theoretical closing position, and it is judged that the moving contact is not safely closed; otherwise, it is judged that the moving contact is safely closed.

3. The swing-arm isolating switch intelligent drive control method according to claim 1, characterized in that, The step of obtaining the actual loop resistance between the moving contact and the static contact by preset test loop, low-voltage weak current test on the moving contact and the static contact, comprises: C1. Inject a low-voltage weak current with a specific modulation frequency between the moving contact and the static contact through the test loop; C2. Measure the actual voltage drop generated by the injected low-voltage weak current flowing through different regions of the contact surface of the moving contact and the static contact; C3. Calculate the loop resistance of each region according to the injected low-voltage weak current and the actual voltage drop of each region, and obtain the actual loop resistance between the moving contact and the static contact.

4. The swing-arm isolating switch intelligent drive control method according to claim 3, characterized in that, The specific steps in step C2 include: C21. After arranging a pair of differential voltage measurement probes in different regions of the contact surface of the moving contact and the static contact, synchronously collect the differential voltage signals of each region through the differential voltage measurement probes; C22. Perform demodulation processing on the differential voltage signals collected in each region in synchronization with the specific modulation frequency to obtain the actual voltage drop of each region.

5. The swing-arm isolating switch intelligent drive control method according to claim 4, characterized in that, The specific steps in step C22 include: C221. According to the specific modulation frequency, generate in-phase reference signals and quadrature-phase reference signals synchronized with the specific modulation frequency; C222. Real-time monitor the instantaneous amplitude of the differential voltage signal collected in each region, and when the instantaneous amplitude exceeds the preset pulse threshold, identify it as a transient high-energy pulse interference event, and mark the differential voltage signal sampling data collected in each region during the occurrence of the transient high-energy pulse interference event; C223. Multiply each region's collected differential voltage signal with the in-phase reference signal and the quadrature-phase reference signal respectively to obtain the multiplication result; C224. Perform low-pass filtering processing on the multiplication result, and in the low-pass filtering processing, assign a lower weight to the multiplication result corresponding to the marked differential voltage signal sampling data than to the multiplication result corresponding to the unmarked sampling data, to obtain the actual voltage drop of each region.

6. A swing-arm isolating switch intelligent drive control system using the swing-arm isolating switch intelligent drive control method according to any one of claims 1 to 5, for controlling a swing-arm isolating switch, characterized by, The swing-arm disconnecting switch comprises a driving motor, a gear, a swing arm and a moving contact connected in sequence, the gear as a transmission chain is used to drive the swing arm to swing and drive the moving contact to move linearly reciprocatingly under the driving of the driving motor, so as to realize the opening and closing of the moving contact and the static contact; The swing-arm disconnecting switch intelligent driving control system comprises: an acquisition module configured to acquire driving parameters of the driving motor and pre-contact electrical parameters of the moving contact; The control module is used for comparing the driving parameter and the pre-contact electrical parameter with corresponding preset reference features, analyzing the mechanical state of the transmission chain and the contact quality of the movable contact, judging whether the movable contact is safe to close, and sending a signal to lock the main circuit breaker when the movable contact is not safe to close.

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