Method and system for confirming opening and closing positions of GIS (Gas Insulated Switchgear) disconnecting switch

Abstract

The invention provides a GIS isolation switch on-off position confirmation method and system. The method comprises the steps that S1, electromagnetic transient signals in the GIS isolation switch on-off process and driving motor action data of a GIS isolation switch are collected; s2, calculating the starting time and the ending time of the electromagnetic transient signal, and judging whether the electromagnetic transient signal has an ignition point or not; and S3, according to the ignition point, determining whether the GIS isolation switch has an opening and closing fault, and according to the action data of the driving motor and the starting point time or the ending point time of the electromagnetic transient signal, carrying out quantitative description on the opening and closing fault of the GIS isolation switch. According to the method, the opening and closing state and the opening and closing position of the GIS disconnecting switch can be accurately judged according to the starting and ending point time of the electromagnetic transient signal in the opening and closing process of the GIS disconnecting switch and the operation data of the motor for driving the GIS disconnecting switch to act, the opening and closing fault is quantitatively described, the required detection equipment is simple in structure, the detection is convenient, and the detection efficiency is improved. And the detection accuracy and reliability are high.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more specifically, to a method and system for confirming the opening and closing positions of GIS disconnecting switches. Background Art

[0002] Gas Insulated Switchgear (GIS) is a key component for realizing the separation and isolation of electrical equipment in power systems. In power systems, after the disconnector opening and closing action instructions are issued, the key focus is whether the equipment completes the corresponding action and can promptly detect the abnormal state of the disconnector opening and closing position to avoid possible operating accidents. This is crucial for the safe and stable operation of the power system.

[0003] As a key component in the power system, the disconnector must be accurate and reliable in its opening and closing actions. After the opening and closing action command is issued, if the device fails to complete the corresponding action, it may cause abnormal circuit connection in the power system and even cause a major accident. Therefore, it is necessary to ensure that the opening and closing positions of the disconnector can accurately respond to the command to ensure the normal operation of the power system.

[0004] However, the mechanical structure of GIS disconnectors is susceptible to assembly errors and long-term use, which can lead to structural damage, thus causing failures. Among them, the problem of inadequate opening and closing poses the greatest threat to the power system and personnel safety.

[0005] In addition, it is also crucial to detect abnormal conditions of the disconnector's open and closed positions in a timely manner. The disconnector may fail or be damaged during operation, resulting in the inability to accurately switch its open and closed positions. If the power system continues to operate in this abnormal state, it may cause serious consequences such as circuit disconnection, overload, short circuit, and even cause fire and explosion. Therefore, it is necessary to be able to detect these abnormal conditions in a timely manner, stop operation in a timely manner, and take corresponding measures to ensure the safety of the power system.

[0006] Since the GIS disconnector has a closed structure, the open and closed positions can usually only be confirmed through the open and closed switch indicator linked to the operating mechanism. However, the information on the open and closed switch indicator cannot effectively determine the problem of inadequate opening and closing caused by defects such as phase loss of the conductive part and broken connecting rods. Although there are some auxiliary detection methods, such as micro switches and posture sensors, which can detect operating mechanism and previous transmission path faults, they also cannot meet the needs of reliable judgment of the open and closed positions of GIS. Therefore, there is an urgent need for a reliable means of detecting the open and closed positions of GIS disconnectors in the industry.

[0007] To achieve this goal, the power system should be equipped with special monitoring and protection devices. These devices should be able to monitor the operation process of the disconnector in real time, ensure the accurate completion of the opening and closing actions, and respond to abnormal situations in a timely manner.

[0008] In the prior art, there are also methods for detecting the opening and closing positions of GIS disconnecting switches through posture detection method, travel switch detection method, motor current detection method, vibration signal detection method, etc. However, the above technical means are relatively complicated and the detection reliability still needs to be improved. Summary of the invention

[0009] In view of the technical problems existing in the prior art, the present invention provides a method and system for confirming the opening and closing positions of GIS disconnecting switches. The opening and closing states and the opening and closing positions of GIS disconnecting switches can be accurately judged through the start and end point times of electromagnetic transient signals and motor operation data, and the opening and closing faults can be quantitatively described. The required detection equipment has a simple structure, is convenient for detection, and has high detection accuracy and reliability.

[0010] According to a first aspect of the present invention, a method for confirming the opening and closing positions of a GIS disconnecting switch is provided, comprising: S1, collects electromagnetic transient signals during the opening and closing process of the GIS disconnector and the action data of the drive motor of the GIS disconnector; S2, calculating the starting time and the ending time of the electromagnetic transient signal, and determining whether the electromagnetic transient signal has an ignition point; S3, judging whether the GIS disconnector has an opening and closing fault according to the ignition point, and quantitatively describing the opening and closing fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

[0011] Based on the above technical solution, the present invention can also make the following improvements.

[0012] Optionally, step S1 includes: S101, receiving a GIS isolating switch action instruction, and collecting a motor action current for driving a moving contact of the GIS isolating switch according to the GIS isolating switch action instruction; S102, if it is determined that the motor operating current reaches the current threshold, triggering synchronous collection of electromagnetic transient signals and motor operating voltage during the opening and closing process of the GIS disconnector; S103, obtaining a real-time power curve of the motor according to the real-time motor operating voltage and the motor operating current.

[0013] Optionally, the electromagnetic transient signal is an electromagnetic induction signal collected at the periphery of the just-opening point / just-closing point of the static contact and the moving contact of the GIS disconnector.

[0014] Optionally, step S102 further includes conditioning the electromagnetic transient signal, specifically including: The electromagnetic transient signal is subjected to proportional voltage division, rectification and electrical isolation.

[0015] Optionally, step S2 includes: Extracting the start time and the end time from the electromagnetic transient signal; Find the ignition point feature in the electromagnetic transient signal, and determine whether the ignition point exists according to the ignition point feature.

[0016] Optionally, in step S3, judging whether the GIS disconnector has an opening / closing fault according to the ignition point includes: If it is determined that there is an ignition point and the GIS disconnector is performing an opening operation, it is determined that the opening is normal; If it is determined that there is an ignition point and the GIS disconnector is in the process of closing, it is determined that the closing is normal; If it is determined that there is no ignition point and the GIS disconnector is in the opening operation, it is determined that there is a refusal to open fault; If it is determined that there is no ignition point and the GIS disconnector is performing a closing operation, it is determined that there is an incomplete closing fault.

[0017] Optionally, step S3, the quantitative description of the opening and closing fault of the GIS disconnector according to the driving motor action data and the starting time or the end time of the electromagnetic transient signal includes: Calculating the overtravel ratio during the closing process according to the end point time of the electromagnetic transient signal and the real-time power curve of the motor, and quantitatively describing the closing fault of the GIS disconnector according to the overtravel ratio; The opening ratio in the opening process is calculated according to the starting time of the electromagnetic transient signal and the real-time power curve of the motor, and the opening fault of the GIS disconnector is quantitatively described according to the opening ratio.

[0018] Optionally, the overtravel ratio in the closing process is calculated according to the endpoint time of the electromagnetic transient signal and the real-time power curve of the motor, and the closing fault of the GIS disconnector is quantitatively described according to the overtravel ratio, specifically including: Obtaining a closing end time point according to the motor real-time power curve based on the time domain, subtracting the closing end time point from the end time of the electromagnetic transient signal to obtain a current closing overtravel motion time T2; Calculate the overtravel ratio K1 according to the following formula: K1=T2 / T1, Among them, T1 is the standard closing overtravel movement time set according to experience; If the value of the overtravel ratio K1 is within the preset range, the overtravel of the current closing process is determined to be normal; if the value of the overtravel ratio K1 is less than the preset range, the overtravel of the current closing process is determined to be reduced and a corresponding warning is issued; if the value of the overtravel ratio K1 is greater than the preset range, the overtravel of the current closing process is determined to be too large and a corresponding warning is issued.

[0019] Optionally, the calculating the opening distance ratio in the opening process according to the starting time of the electromagnetic transient signal and the real-time power curve of the motor, and quantitatively describing the opening fault of the GIS disconnector according to the opening distance ratio specifically includes: The opening end time point is obtained according to the real-time power curve of the motor based on the time domain, and the current opening distance movement time T3 is obtained by subtracting the opening end time point from the starting time of the electromagnetic transient signal; Calculate the opening ratio K2 according to the following formula: K2=T3 / T4, Among them, T4 is the standard gate opening distance movement time set according to experience; If the value of the opening distance ratio K2 is within the preset range, the opening distance of the current opening process is determined to be normal; if the value of the opening distance ratio K2 is less than the preset range, the opening distance of the current opening process is determined to be reduced and a corresponding warning is issued; if the value of the opening distance ratio K2 is greater than the preset range, the opening distance of the current opening process is determined to be too large and a corresponding warning is issued.

[0020] According to a second aspect of the present invention, a GIS disconnector opening and closing position confirmation system is provided, comprising: The acquisition module is used to collect electromagnetic transient signals during the opening and closing process of the GIS disconnector and the power signal of the driving motor of the GIS disconnector; An extraction module calculates the starting time and the ending time of the electromagnetic transient signal, and determines whether the electromagnetic transient signal has an ignition point; The judgment module is used to judge whether the GIS disconnector has an opening and closing fault according to the ignition point, and quantitatively describe the opening and closing fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

[0021] Optionally, a signal conditioning module is also included, and the signal conditioning module is used to perform proportional voltage division, rectification and electrical isolation on the electromagnetic transient signal.

[0022] The present invention provides a method and system for confirming the opening and closing positions of GIS disconnecting switches. According to the relationship between the starting and ending time points of the electromagnetic transient signal and the relative positions of the moving and static contacts when the GIS disconnecting switch is energized, the starting and ending time points of the electromagnetic transient signal are obtained, which can be used as the basis for judging the opening and closing states and positions of the GIS disconnecting switch. The processing flow of voltage division denoising and pulse counting is further adopted, and a method for extracting effective features of high-frequency electromagnetic transient signals is proposed. Only the starting time and the ending time of the arcing signal are extracted for calculation. Under the premise of greatly reducing the amount of collected data, the confirmation of the opening and closing positions of the GIS disconnecting switch is successfully completed, and the opening and closing faults can be quantitatively described. The present invention can accurately judge the opening and closing states and opening and closing positions of the GIS disconnecting switch through the starting and ending time of the arcing signal and the motor operation data that drives the GIS disconnecting switch to operate, and quantitatively describe the opening and closing faults. The required detection equipment has a simple structure, convenient detection, and high detection accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the electromagnetic transient signal generation principle of the GIS disconnector of the present invention; Figure 2 A schematic diagram of the detection wiring principle of an embodiment of the present invention; Figure 3 A schematic diagram of synchronous acquisition and comparison of bus voltage waveform and Rogowski coil induced voltage during live opening of a GIS disconnector provided by an embodiment of the present invention; Figure 4 A schematic diagram of a signal conditioning circuit provided by an embodiment of the present invention; FIG5 is a schematic diagram of the detection result judgment provided by an embodiment of the present invention, wherein FIG5(a) is a schematic diagram of the judgment of the refusal to close fault, FIG5(b) is a schematic diagram of the judgment of the refusal to separate fault, FIG5(c) is a schematic diagram of the judgment of the overtravel ratio abnormal fault, and FIG5(d) is a schematic diagram of the judgment of the open distance ratio abnormal fault; Figure 6 A structural block diagram of a GIS disconnector opening and closing position confirmation system provided by the present invention; Figure 7 A schematic diagram of the hardware structure of a possible electronic device provided by the present invention; Figure 8 A schematic diagram of the hardware structure of a possible computer-readable storage medium provided by the present invention. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] Figure 1It is a schematic diagram of the principle of generating electromagnetic transient signals during the opening and closing process of the GIS disconnector; Figure 2 Schematic diagram of the detection wiring principle of an embodiment of the present invention, Figure 3 A schematic diagram of synchronous acquisition and comparison of bus voltage waveform and Rogowski coil induced voltage during live opening of a GIS disconnecting switch provided in an embodiment of the present invention.

[0026] like Figure 1 As shown in the figure, through the analysis of the physical process of the live closing of the GIS disconnector, it can be known that the discharge during the closing process first occurs when the electric field strength exceeds the breakdown field strength of sulfur hexafluoride gas for the first time, and then ends after the moving and static contacts contact to form a metal path. In the live opening process, the discharge first occurs at the moment when the moving and static contacts are out of contact, and then ends when the electric field strength formed by the gap between the moving and static contacts and the potential difference is less than the breakdown field strength of sulfur hexafluoride gas. In the above process, multiple breakdown discharges will occur between the moving and static contacts. The signals generated by these discharge processes are called arcing signals. The electromagnetic transient signals in the discharge process can be extracted by installing Rogowski coils on the GIS disconnector.

[0027] According to whether there is an ignition point in the arcing signal during the closing process, it can be judged whether the closing is not in place, that is, when the arc ignition phenomenon does not occur during the live closing process of the GIS disconnector, it indicates that the moving and static contacts are not in contact, and the closing is seriously not in place. Similarly, according to whether there is an ignition point in the arcing signal during the live opening process, it can reflect the refusal to open fault, that is, when the arc ignition phenomenon does not occur during the live opening process of the GIS disconnector, it indicates that the moving and static contacts are not separated and the opening fails. At the same time, the driving motor power information provided by the arc extinction point in the opening arcing signal can also be used to determine the starting point of the safe opening distance and realize the diagnosis of the opening distance safety margin.

[0028] In summary, by judging the start and end time points of the arcing signal during the live opening and closing process of the GIS disconnector, it is possible to determine whether the disconnector is opened or closed successfully. This is information that the power system is very concerned about but cannot be accurately obtained through existing detection methods. Based on the above principle, the present invention can timely detect abnormal opening and closing positions of the disconnector by analyzing the arcing signal, thereby ensuring the safe and stable operation of the power system. Furthermore, by unifying the time axis of the arcing signal and the electromagnetic transient signal (synchronous sampling), the overtravel ratio and the open distance ratio of the GIS disconnector can also be calculated, providing an effective quantitative basis for the functional confirmation of the GIS disconnector.

[0029] The embodiment of the present invention is based on Figure 1 The working principle shown and Figure 2 Based on the detection wiring relationship in the GIS, a detection system is built to detect the opening and closing state and opening and closing position of the moving and static contacts inside the GIS disconnector. Figure 2The detection system shown in the figure, the embodiment of the present invention provides a method for confirming the opening and closing positions of GIS disconnecting switches, including steps S1 to S3: S1, collects electromagnetic transient signals during the opening and closing process of the GIS disconnector and the power signal of the driving motor of the GIS disconnector; S2, calculating the starting time and the ending time of the electromagnetic transient signal, and determining whether the electromagnetic transient signal has an ignition point; S3, judging whether the GIS disconnector has a closing or opening fault according to the ignition point, and quantitatively describing the closing or opening fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

[0030] It can be understood that, based on the defects pointed out in the background technology, the present embodiment provides a method and system for confirming the opening and closing position of a GIS disconnecting switch. According to the relationship between the start and end time points of the electromagnetic transient signal (corresponding to the arcing signal) and the relative positions of the moving and static contacts when the GIS disconnecting switch is energized, the start and end time points of the electromagnetic transient signal can be used as the basis for judging the opening and closing state and position of the GIS disconnecting switch. The present invention can accurately judge the opening and closing state and the opening and closing position of the GIS disconnecting switch through the start and end time of the electromagnetic transient signal and the operation data of the motor driving the GIS disconnecting switch, and can quantitatively describe the opening and closing fault. The required detection equipment has a simple structure, convenient detection, and high detection accuracy and reliability.

[0031] In a possible implementation manner, step S1 includes: S101, receiving a GIS isolating switch action instruction, and collecting a motor action current for driving a moving contact of the GIS isolating switch according to the GIS isolating switch action instruction; S102, if it is determined that the motor operating current reaches the current threshold, then trigger the synchronous collection of electromagnetic transient signals and motor operating voltage during the opening and closing process of the GIS disconnector; wherein the electromagnetic transient signal is: an electromagnetic induction signal collected at the periphery of the just-opening point / just-closing point of the static contact and the moving contact of the GIS disconnector; S103, acquiring the motor motion data according to the real-time motor motion voltage and motor motion current, wherein the motor motion data at least includes a real-time motor power curve.

[0032] It is understandable that arcing signals have many manifestations in the power system, such as ultra-fast transient overvoltage on the busbar, and it is difficult to obtain this signal directly from the busbar using a high-frequency method at the industrial site. From the analysis of the physical process, when the arcing signal is generated, the corresponding isolating switch moving contact is connected to the busbar, and the static contact is suspended. The breakdown discharge process can be regarded as the charging and discharging process of the capacitor formed between the static contact and the ground, that is, each pulse will generate a charging and discharging current of the capacitor on the busbar. This charging and discharging current will form an alternating magnetic field around the busbar, which is another manifestation of the arcing process. This embodiment detects the discharge signal of the GIS isolating switch opening and closing process by using the voltage signal induced by the Rogowski coil in the alternating magnetic field. Since the GIS isolating switch is enclosed in the cavity, and the cavity is mostly composed of conductors and reliably grounded, it has a shielding effect on electromagnetic signals. Therefore, the installation position of the Rogowski coil selected in this embodiment passes through the partial discharge detection port of the GIS isolating switch. The partial discharge detection port is a non-electromagnetic shielding location, and the electromagnetic transient signal in the discharge process can be detected. The electromagnetic transient signal corresponds to the arcing signal and can be used to study the characteristics of the arcing signal.

[0033] For example, Figure 3 The figure shows the comparison of bus voltage and Rogowski coil induced voltage collected synchronously on a high-bandwidth oscilloscope during the live opening process of a 220kV GIS disconnector. Figure 3 It can be seen that the Rogowski coil can extract electromagnetic transient information during the discharge process of the GIS disconnector. When VFTO (fast transient overvoltage) occurs on the bus, the induced voltage of the Rogowski coil also induces a pulse voltage at the same time point. Figure 3 It can be seen that the bus voltage pulse peak value and the Rogowski coil induced voltage peak value do not show a strictly proportional relationship. The reason is related to the GIS disconnector structure and the coil electrical parameters, which will not be analyzed in this embodiment. Through the above analysis, it can be seen that in order to analyze the open and closed positions of the GIS disconnector, it is only necessary to analyze whether the arcing signal exists and whether the arcing signal is terminated.

[0034] As for the collection of the motor operating current used to drive the moving contacts of the GIS disconnector, in order to obtain the power information of the motor in real time, specific voltage sensors and current sensors are usually deployed to monitor and record the voltage and current data of the GIS disconnector moving contact driving motor during operation.

[0035] Voltage sensors are designed to accurately measure and monitor the voltage across the motor. Depending on their design and application, voltage sensors can detect AC or DC voltage, ensuring accurate data.

[0036] Current sensors are used to measure the input or output current of a motor. Common current sensors include Hall effect sensors, current transformers, etc.

[0037] After obtaining the real-time data of the motor's voltage and current, the motor's real-time power P can be calculated using the following formula:

[0038] Where V is the voltage across the motor, I is the current in the motor, and θ is the phase difference between the voltage and current.

[0039] In step S101, when the isolating switch receives the action command, its moving contact drives the motor to start moving, and the current sensor of the terminal senses the action current of the motor; in step S102, if it is determined that the action current of the motor reaches the current threshold, the acquisition function of the terminal is triggered, and the terminal starts to synchronously collect the above-mentioned motor action data (such as the motor action voltage) and the electromagnetic transient signal during the opening and closing process of the GIS isolating switch (to extract the characteristic information of the arcing signal); in step S103, the motor action data is obtained according to the real-time collected motor action voltage and motor action current, for example, the real-time power P of the motor is calculated, and the real-time power curve of the motor in the time domain is constructed.

[0040] In one possible implementation manner, after the electromagnetic transient signal is acquired in step S102, the electromagnetic transient signal is further conditioned, specifically including: The electromagnetic transient signal is proportionally divided, rectified and electrically isolated.

[0041] like Figure 4 As shown, a high-precision intelligent electromagnetic transient signal processing and isolation circuit is demonstrated. Figure 4 The high-precision intelligent electromagnetic transient signal processing and isolation circuit shown is a signal processing solution designed for electromagnetic transient signal monitoring and analysis of the GIS disconnector in this embodiment. The circuit integrates functions such as signal conditioning, intelligent noise suppression and electrical isolation to ensure accurate and reliable signal detection and processing in a complex high-frequency and high-voltage environment.

[0042] More specifically, Figure 4 The circuit shown mainly includes three modules: signal conditioning unit, intelligent noise suppression unit and safety isolation unit.

[0043] (1) Signal conditioning unit Function: Adjust the input high voltage signal to a safe processable range to ensure the normal operation of subsequent processing units.

[0044] Implementation: Intelligently condition the input high voltage signal through a precision resistor network. These precision resistors are precisely designed according to the circuit requirements and can effectively reduce the amplitude of the signal without affecting the overall characteristics of the signal. Specifically, the input signal is proportionally divided by the resistor network to ensure that the output signal is within the acceptable voltage range of the subsequent processing unit.

[0045] (2) Intelligent noise suppression unit Function: Remove low-amplitude noise from the signal, retain useful arcing signal components, and ensure the purity and effectiveness of the signal.

[0046] Implementation: Use a highly sensitive rectifier unit to identify and filter out background noise. The rectifier unit consists of high-precision diodes and other components that can effectively distinguish useful signals from noise signals. Users can automatically adjust the filtering parameters based on the frequency and amplitude characteristics of the signal so that the noise is suppressed to a very low level while retaining the main characteristics of the arcing signal.

[0047] (3) Safety isolation unit (photoelectric isolation is used in this embodiment) Function: To achieve electrical isolation of signals, prevent high-frequency and high-voltage signals from interfering with subsequent processing units, and ensure the safety and integrity of signal transmission.

[0048] Implementation: Use a photocoupler to convert the conditioned electrical signal into an optical signal for transmission, and then restore the optical signal to an electrical signal in the subsequent circuit. The working principle of the photocoupler is that the LED emits the optical signal, and the phototransistor receives and converts it back into an electrical signal, thereby achieving electrical isolation. This module ensures that the signal will not be subject to electromagnetic interference when transmitted in a high-frequency and high-voltage environment, while protecting subsequent circuit components.

[0049] Now Figure 4 The circuit shown in the figure is used as an example to illustrate. This signal conditioning circuit adopts a proportional voltage divider plus a bridge rectifier circuit. The electromagnetic transient signal is Figure 4 The left side HV IN± enters and is proportionally divided by the voltage divider resistors composed of R1, R2 and R9. Resistor R9 is an adjustable resistor, and the voltage division ratio can be adjusted by adjusting the resistance value of resistor R9. After the electromagnetic transient signal is divided, it is further de-noised by the diodes (D1, D2, BAV70 and BAW56) of the bridge rectifier circuit. The basic logic of de-noising is that the diode has a forward conduction voltage drop of about 0.7V, and the amplitude of the electromagnetic transient signal (corresponding to the arcing signal, which is a pulse signal) is higher than the noise amplitude. After passing through the voltage divider circuit, the electromagnetic transient signal (corresponding to the arcing signal, which is a pulse signal) and the noise signal will be attenuated, and the attenuated value can be expressed by the following formula: , In the formula, V originRepresents the input voltage, including electromagnetic transient signals and noise signals; Vd represents the signal after the electromagnetic transient signal and noise signal are attenuated. At this time, in order to filter out the noise, it is only necessary to adjust the sliding rheostat R9 so that the maximum value of the attenuated noise signal is less than 0.7V, and the noise signal will be cut off by the diode of the bridge rectifier circuit, achieving the denoising effect. After signal conditioning, the denoised electromagnetic transient signal can be screened out to more accurately characterize the arcing signal.

[0050] Furthermore, in order to ensure signal accuracy and avoid the electromagnetic influence of high-frequency and high-voltage signals on other parts of the acquisition terminal, an optical coupler isolation device ( Figure 4 The 6N137 in the optocoupler can also be used to electrically isolate electromagnetic transient signals. Since all devices on the primary side of the optocoupler isolation device are passive devices, they will not be affected by high frequencies, and the optocoupler isolation will isolate the impact on subsequent circuits.

[0051] The signal acquisition module acquires the electromagnetic transient signal representing the arcing signal through the secondary side of the safety isolation unit. Since the acquisition object is a 2MHz level signal, and the current single-chip microcomputer can reach a sampling speed of tens of megahertz, the embodiment of the present invention uses a single-chip microcomputer to directly sample the secondary side output of the optocoupler at a frequency of more than 30MHz, but when transmitting data, only the accurate time of the start and end point of the electromagnetic transient signal representing the arcing signal is transmitted, avoiding the increase of data.

[0052] pass Figure 4 After the signal conditioning circuit shown obtains the sampled electromagnetic transient signal, the electromagnetic transient signal is processed through step S2, which specifically includes: Extracting the start time and end time from the electromagnetic transient signal; Find the ignition point features in the electromagnetic transient signal and determine whether the ignition point exists based on the ignition point features.

[0053] In one possible implementation, as shown in FIG5 , in step S3, judging whether the GIS disconnector has a disconnection fault according to the ignition point includes: If it is determined that there is an ignition point and the GIS disconnector is in the opening operation, it is determined that the opening is normal; If it is determined that there is an ignition point and the GIS disconnector is closing, it is determined that the closing is normal; If it is determined that there is no ignition point and the GIS disconnector is in the opening operation, it is determined that there is a refusal to open fault; If it is determined that there is no ignition point and the GIS disconnector is in the closing operation, it is determined that there is an incomplete closing fault.

[0054] It can be understood that Figure 5(a) is a schematic diagram for judging the refusal to close fault, and Figure 5(b) is a schematic diagram for judging the refusal to open fault. The power curve can be used to judge whether the GIS disconnector is in the process of opening and closing. According to whether there is an ignition point in the electromagnetic transient signal of the closing process, it can be judged whether the closing is not in place, that is, when the arc ignition phenomenon does not occur during the live closing process of the GIS disconnector, it indicates that the moving and static contacts are not in contact and the closing is seriously not in place. Similarly, according to whether there is an ignition point in the electromagnetic transient signal of the live opening process, the refusal to open fault can be reflected, that is, when the arc ignition phenomenon does not occur during the live opening process of the GIS disconnector, it indicates that the moving and static contacts are not separated and the opening fails.

[0055] More specifically, (1) Judgment of incomplete closing: Judgment logic: During the closing operation, the moving contact and the static contact will generate an arcing signal at the moment of contact, which can be simply understood as the electromagnetic transient signal detected by the above embodiment. The ignition point of the signal is the moment when the moving contact first contacts the static contact. If the ignition point of the electromagnetic transient signal is not detected during the closing operation, it means that the moving contact fails to properly contact the static contact, resulting in incomplete closing.

[0056] Judgment method: Collect electromagnetic transient signals during the live closing process and use high-frequency sampling equipment to record signal changes.

[0057] Analyze electromagnetic transient signal data, especially find the ignition point characteristics in the signal.

[0058] If the ignition point feature is not detected, the status is recorded as incomplete closing.

[0059] (2) Rejection fault judgment: Judgment logic: During the opening operation, the moving contact and the static contact will generate an arcing signal at the moment of separation, which can be simply understood as the electromagnetic transient signal detected by the above embodiment. The ignition point of the signal is the moment when the moving contact begins to separate from the static contact. If the ignition point of the electromagnetic transient signal is not detected during the opening operation, it means that the moving contact fails to separate from the static contact, resulting in a failure of the opening.

[0060] Judgment method: Collect electromagnetic transient signals during the live opening process and use high-frequency sampling equipment to record signal changes.

[0061] Analyze electromagnetic transient signal data, especially find the ignition point characteristics in the signal.

[0062] If the ignition point signature is not detected, the status is recorded as a rejection fault.

[0063] Triggering the alarm mechanism, including sounding an alarm, flashing lights, or generating an alarm record in the monitoring system, alerts the operator.

[0064] The system automatically generates a fault report and notifies maintenance personnel to conduct on-site inspection and repair to ensure that the opening operation can be completed correctly.

[0065] FIG5(c) is a schematic diagram of judging an abnormal overtravel ratio fault, and FIG5(d) is a schematic diagram of judging an abnormal open distance ratio fault. In one possible embodiment, in step S3, the opening and closing faults of the GIS disconnector are quantitatively described according to the driving motor action data and the starting time or the end time of the electromagnetic transient signal, including: The overtravel ratio in the closing process is calculated based on the end point time of the electromagnetic transient signal and the real-time power curve of the motor, and the closing fault of the GIS disconnector is quantitatively described based on the overtravel ratio; The opening ratio in the opening process is calculated according to the starting time of the electromagnetic transient signal and the real-time power curve of the motor, and the opening fault of the GIS disconnector is quantitatively described according to the opening ratio.

[0066] It can be understood that in addition to judging whether there is a refusal to open fault or a refusal to close fault based on the electromagnetic transient signal and the real-time power curve of the motor, it is also possible to further judge the more microscopic over-travel ratio anomaly and the safe opening distance ratio anomaly, that is, to quantitatively describe the closing fault / opening fault of the GIS disconnector through the over-travel ratio and the safe opening distance ratio.

[0067] (3) As shown in FIG5(c), the process of judging the overtravel ratio closing fault specifically includes: First, when the mechanical state of the disconnector is normal, collect a set of motor power curves during the closing process and the electromagnetic transient curves of the same process. The end point of the electromagnetic transient signal during the closing process is the just-closing point, so the time difference from the time point corresponding to the just-closing point to the end of the closing is T1. T1 is recorded as the standard closing overtravel motion time.

[0068] When the GIS disconnector performs subsequent closing action, the closing end time point is obtained according to the real-time power curve of the motor based on the time domain, and the closing end time point is subtracted from the end time of the electromagnetic transient signal to obtain the current closing over-travel movement time T2; that is, the time difference from the time point corresponding to the just-closing point to the end of closing is the current closing over-travel movement time T2.

[0069] Calculate the overtravel ratio K1 according to the following formula: K1=T2 / T1, Among them, T1 is the standard closing overtravel movement time set according to experience; If the value of the overtravel ratio K1 is within the preset range, the overtravel of the current closing process is determined to be normal; if the value of the overtravel ratio K1 is less than the preset range, the overtravel of the current closing process is determined to be reduced and a corresponding warning is issued; if the value of the overtravel ratio K1 is greater than the preset range, the overtravel of the current closing process is determined to be too large and a corresponding warning is issued.

[0070] According to actual needs, the overtravel ratio threshold can be set to a specific value (for example, 1). The overtravel ratio threshold plus the tolerance (for example, 1±0.05) can obtain the preset range of the overtravel ratio. Of course, the tolerance can also be set without setting a specific value as the overtravel ratio threshold. For example, if the overtravel ratio K1 is calculated to be 1, it means that the overtravel ratio of the GIS disconnector is normal / unchanged. If the calculated overtravel ratio K1 is greater than 1, it means that the overtravel is increasing. Set the overtravel ratio threshold according to the needs of on-site operation and maintenance, and generate an alarm when it is too large or too small.

[0071] (4) As shown in FIG5(d), the process of judging the fault of the safety opening distance ratio gate specifically includes: First, when the mechanical state of the disconnector is normal, collect a group of motor power curves of the switching process and the electromagnetic transient curves of the same process. The starting point of the electromagnetic transient signal of the opening process is the just-opening point, so the time difference from the time point corresponding to the just-opening point to the end of the opening is T4. T4 is recorded as the standard opening distance movement time.

[0072] When the GIS disconnector subsequently opens, the opening end time point is obtained according to the real-time power curve of the motor based on the time domain, and the opening end time point is subtracted from the starting time of the electromagnetic transient signal to obtain the current opening distance movement time T3; that is, the time difference from the time point corresponding to the opening point to the end of the opening is T3.

[0073] Calculate the opening ratio K2 according to the following formula: K2=T3 / T4, Among them, T4 is the standard gate opening distance movement time set according to experience; If the value of the opening distance ratio K2 is within the preset range, the opening distance of the current opening process is determined to be normal; if the value of the opening distance ratio K2 is less than the preset range, the opening distance of the current opening process is determined to be reduced and a corresponding warning is issued; if the value of the opening distance ratio K2 is greater than the preset range, the opening distance of the current opening process is determined to be too large and a corresponding warning is issued.

[0074] According to actual needs, the opening ratio threshold can be set to a specific value (for example, 1). The opening ratio threshold plus the tolerance (for example, 1±0.05) can obtain the preset range of the opening ratio. Of course, the tolerance can also be set without setting a tolerance, and only a specific value can be set as the opening ratio threshold. For example, the opening ratio threshold is set to 1. If the calculated opening ratio K2 is 1, it means that the opening ratio of the GIS disconnector is normal / unchanged. If the opening ratio is less than 1, it means that the opening distance is reduced and there is a risk of the switch not being in place. If the opening ratio is greater than 1, it means that the opening distance is increased. Set the opening ratio threshold according to the needs of on-site operation and maintenance, and generate an alarm if it is too large or too small.

[0075] Figure 6 A structural diagram of a GIS disconnector position confirmation system provided by an embodiment of the present invention, such as Figure 6 As shown, a GIS disconnector opening and closing position confirmation system includes a collection module, an extraction module and a judgment module, wherein: The acquisition module is used to collect electromagnetic transient signals during the opening and closing process of the GIS disconnector and the power signal of the driving motor of the GIS disconnector; An extraction module is used to calculate the start time and end time of the electromagnetic transient signal and determine whether there is an ignition point in the electromagnetic transient signal; The judgment module is used to judge whether the GIS disconnector has an opening and closing fault according to the ignition point, and to quantitatively describe the opening and closing fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

[0076] It can be understood that the GIS disconnector switch open / close position confirmation system provided by the present invention corresponds to the GIS disconnector switch open / close position confirmation method provided by the aforementioned embodiments. The relevant technical features of the GIS disconnector switch open / close position confirmation system can refer to the relevant technical features of the GIS disconnector switch open / close position confirmation method, which will not be repeated here.

[0077] In one possible implementation, the system further includes a signal conditioning module, which is used to perform proportional voltage division on the electromagnetic transient signal to modulate the amplitude, rectification to reduce noise, and electrical isolation to improve safety.

[0078] See also Figure 7 , Figure 7 Schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 7 As shown, an embodiment of the present invention provides an electronic device 700, including a memory 710, a processor 720, and a computer program 711 stored in the memory 710 and executable on the processor 720. When the processor 720 executes the computer program 711, the following steps are implemented: S1, collects electromagnetic transient signals during the opening and closing process of the GIS disconnector and the power signal of the driving motor of the GIS disconnector; S2, calculating the starting time and the ending time of the electromagnetic transient signal, and determining whether the electromagnetic transient signal has an ignition point; S3, judging whether the GIS disconnector has a closing or opening fault according to the ignition point, and quantitatively describing the closing or opening fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

[0079] See also Figure 8 , Figure 8 Schematic diagram of an embodiment of a computer-readable storage medium provided by the present invention. Figure 8 As shown, this embodiment provides a computer-readable storage medium 800, on which a computer program 811 is stored. When the computer program 811 is executed by a processor, the following steps are implemented: S1, collects electromagnetic transient signals during the opening and closing process of the GIS disconnector and the power signal of the driving motor of the GIS disconnector; S2, calculating the starting time and the ending time of the electromagnetic transient signal, and determining whether the electromagnetic transient signal has an ignition point; S3, judging whether the GIS disconnector has a closing or opening fault according to the ignition point, and quantitatively describing the closing or opening fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

[0080] The embodiment of the present invention provides a method and system for confirming the opening and closing position of a GIS disconnecting switch. According to the relationship between the starting and ending time points of the electromagnetic transient signal and the relative positions of the moving and static contacts when the GIS disconnecting switch is energized, the starting and ending time points of the electromagnetic transient signal are obtained, which can be used as the basis for judging the opening and closing state and position of the GIS disconnecting switch. The processing flow of voltage division denoising and pulse counting is further adopted, and a method for extracting effective features of high-frequency electromagnetic transient signals is proposed. Only the starting time and the ending time of the arcing signal are extracted for calculation. Under the premise of greatly reducing the amount of collected data, the confirmation of the opening and closing position of the GIS disconnecting switch is successfully completed. The present invention can accurately judge the opening and closing state and the opening and closing position of the GIS disconnecting switch through the starting and ending time of the arcing signal and the motor operation data that drives the GIS disconnecting switch to operate, and can quantitatively describe the opening and closing faults. The required detection equipment has a simple structure, convenient detection, and high detection accuracy and reliability.

[0081] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0082] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0083] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0084] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0085] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0086] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0087] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for confirming the opening and closing positions of a GIS disconnector, characterized in that: include: S1, collects electromagnetic transient signals during the opening and closing process of the GIS disconnector and the action data of the drive motor of the GIS disconnector; S2, calculating the starting time and the ending time of the electromagnetic transient signal, and determining whether the electromagnetic transient signal has an ignition point; S3, judging whether the GIS disconnector has an opening and closing fault according to the ignition point, and quantitatively describing the opening and closing fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

2. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 1, characterized in that: Step S1 includes: S101, receiving a GIS isolating switch action instruction, and collecting a motor action current for driving a moving contact of the GIS isolating switch according to the GIS isolating switch action instruction; S102, if it is determined that the motor operating current reaches the current threshold, triggering synchronous collection of electromagnetic transient signals and motor operating voltage during the opening and closing process of the GIS disconnector; S103, acquiring the motor action data according to the real-time motor action voltage and the motor action current, wherein the motor action data at least includes a real-time motor power curve.

3. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 2, characterized in that: The electromagnetic transient signal is an electromagnetic induction signal collected at the periphery of the just-opening point / just-closing point of the static contact and the moving contact of the GIS disconnector.

4. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 2, characterized in that: Step S102 also includes conditioning the electromagnetic transient signal, specifically including: The electromagnetic transient signal is subjected to proportional voltage division, rectification and electrical isolation.

5. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 1, characterized in that: Step S2 comprises: Extracting the start time and the end time from the electromagnetic transient signal; Find the ignition point feature in the electromagnetic transient signal, and determine whether the ignition point exists according to the ignition point feature.

6. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 5, characterized in that: In step S3, judging whether the GIS disconnector has an opening and closing fault according to the ignition point includes: If it is determined that there is an ignition point and the GIS disconnector is performing an opening operation, it is determined that the opening is normal; If it is determined that there is an ignition point and the GIS disconnector is in the process of closing, it is determined that the closing is normal; If it is determined that there is no ignition point and the GIS disconnector is in the opening operation, it is determined that there is a refusal to open fault; If it is determined that there is no ignition point and the GIS disconnector is performing a closing operation, it is determined that there is an incomplete closing fault.

7. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 6, characterized in that: Step S3, quantitatively describing the opening and closing fault of the GIS disconnector according to the driving motor action data and the starting time or the ending time of the electromagnetic transient signal, includes: Calculating the overtravel ratio during the closing process according to the end point time of the electromagnetic transient signal and the real-time power curve of the motor, and quantitatively describing the closing fault of the GIS disconnector according to the overtravel ratio; The opening ratio in the opening process is calculated according to the starting time of the electromagnetic transient signal and the real-time power curve of the motor, and the opening fault of the GIS disconnector is quantitatively described according to the opening ratio.

8. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 7, characterized in that: The calculating of the overtravel ratio in the closing process according to the endpoint time of the electromagnetic transient signal and the real-time power curve of the motor, and the quantitative description of the closing fault of the GIS disconnector according to the overtravel ratio specifically include: Obtaining a closing end time point according to the motor real-time power curve based on the time domain, subtracting the closing end time point from the end time of the electromagnetic transient signal to obtain a current closing overtravel motion time T2; Calculate the overtravel ratio K1 according to the following formula: K1=T2 / T1, Among them, T1 is the standard closing overtravel movement time set according to experience; If the value of the overtravel ratio K1 is within the preset range, the overtravel of the current closing process is determined to be normal; if the value of the overtravel ratio K1 is less than the preset range, the overtravel of the current closing process is determined to be reduced and a corresponding warning is issued; if the value of the overtravel ratio K1 is greater than the preset range, the overtravel of the current closing process is determined to be too large and a corresponding warning is issued.

9. A method for confirming the opening and closing positions of GIS disconnecting switches according to claim 7 or 8, characterized in that: The step of calculating the opening distance ratio in the opening process according to the starting time of the electromagnetic transient signal and the real-time power curve of the motor, and quantitatively describing the opening fault of the GIS disconnector according to the opening distance ratio, specifically includes: The opening end time point is obtained according to the real-time power curve of the motor based on the time domain, and the current opening distance movement time T3 is obtained by subtracting the opening end time point from the starting time of the electromagnetic transient signal; Calculate the opening ratio K2 according to the following formula: K2=T3 / T4, Among them, T4 is the standard gate opening distance movement time set according to experience; If the value of the opening distance ratio K2 is within the preset range, the opening distance of the current opening process is determined to be normal; if the value of the opening distance ratio K2 is less than the preset range, the opening distance of the current opening process is determined to be reduced and a corresponding warning is issued; if the value of the opening distance ratio K2 is greater than the preset range, the opening distance of the current opening process is determined to be too large and a corresponding warning is issued.

10. A GIS disconnector opening and closing position confirmation system, characterized in that: include: The acquisition module is used to collect electromagnetic transient signals during the opening and closing process of the GIS disconnector and the action data of the drive motor of the GIS disconnector; An extraction module, used to calculate the starting time and the ending time of the electromagnetic transient signal, and determine whether the electromagnetic transient signal has an ignition point; The judgment module is used to judge whether the GIS disconnector has an opening and closing fault according to the ignition point, and quantitatively describe the opening and closing fault of the GIS disconnector according to the driving motor action data and the starting time or end time of the electromagnetic transient signal.

11. A GIS disconnector opening and closing position confirmation system according to claim 10, characterized in that: It also includes a signal conditioning module, which is used to perform proportional voltage division, rectification and electrical isolation on the electromagnetic transient signal.

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