GIS isolation switch fault diagnosis method and system based on multiple parameters

Abstract

The invention discloses a GIS isolation switch fault diagnosis method and system based on multiple parameters, and solves the problems that the workload is large, the detection precision is low, and the opening and closing states of a GIS isolation switch cannot be accurately judged when the opening and closing states of the isolation switch are detected in the prior art. Converting the current data into a current time waveform; the method comprises the following steps: acquiring and processing an angular displacement signal when a GIS isolating switch is switched on and off, converting the angular displacement signal into stroke data, and establishing a switching on and off action curve according to the stroke data; and according to the opening and closing action curve and the current time waveform, analyzing the continuous process of each action stage of opening and closing of the contact of the GIS isolating switch, and judging whether the opening and closing of the GIS isolating switch are normal or not. The state of the GIS disconnecting switch is judged by detecting the angular velocity of the GIS disconnecting switch and the motor current, the fault type of the GIS disconnecting switch can be conveniently and effectively determined, and whether the GIS disconnecting switch is switched on and switched off in place or not is judged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of isolating switch state detection, and particularly relates to a GIS isolating switch fault diagnosis method and system based on multiple parameters. BACKGROUND

[0002] The substation is an important part of the power grid, and its operation state is one of the important factors determining whether the power grid can safely operate. In the past, the actual operation condition of the device was identified by manual inspection in the old substation, which led to hidden dangers and defects such as untimely and unsafe. In order to comply with the future development direction of the intelligent substation, the unattended operation of the substation has gradually become the development trend of the current power grid dispatching automation. Therefore, it is necessary to monitor the opening and closing state of the substation switch device in real time to ensure the normal operation of the substation.

[0003] At present, the isolating switch is the most widely used and installed device in the power grid system. If the isolating switch is operated for a long time, it may appear to be rusty and jammed, which can easily cause the opening and closing to be out of place. Therefore, the operating state of the isolating switch is one of the key factors determining whether the substation can safely operate, and the automatic identification of its state is of great significance to the production and operation monitoring of the power grid.

[0004] Due to the closed structure of the GIS isolating switch, the opening and closing positions can usually be confirmed only through the opening and closing indicator connected with the operating mechanism. However, the opening and closing indicator information cannot effectively determine the opening and closing out of place problem caused by defects such as phase separation of the conducting part and fracture of the connecting rod. Although there are some auxiliary detection means, such as microswitches and attitude sensors, which can detect faults in the operating mechanism and previous transmission path, they cannot meet the demand of reliably determining the opening and closing position of GIS. Therefore, there is an urgent need in the industry for a reliable GIS isolating switch fault detection method. SUMMARY

[0005] The purpose of the present application is to solve the problems of large workload, low detection accuracy and inability to accurately determine the opening and closing state of the GIS isolating switch in the prior art. A GIS isolating switch fault diagnosis method and system based on multiple parameters are provided, which determines the state of the GIS isolating switch by detecting the angular velocity and motor current of the GIS isolating switch. The calculation process is relatively simple, which can conveniently and effectively determine the fault type of the GIS isolating switch and determine whether the GIS isolating switch is in place.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: A GIS isolating switch fault diagnosis method based on multiple parameters, comprising the following steps: S1: Collecting motor winding current when GIS disconnecting switch is opened and closed, and converting current data into current time waveform; S2: Collecting angle displacement signal when GIS disconnecting switch is opened and closed, and converting angle displacement signal into stroke data, and establishing opening and closing action curve according to the stroke data; S4: Analyzing duration of each action stage of GIS disconnecting switch contact opening and closing according to the opening and closing action curve and current time waveform, and judging whether GIS disconnecting switch opening and closing is normal.

[0007] The GIS disconnecting switch fault diagnosis method based on multiple parameters provided by the application can analyze opening distance and closing insertion depth of the contact of GIS disconnecting switch through stroke or angle data of GIS disconnecting switch, and can further judge whether the disconnecting switch is opened and closed in place. Through state analysis of each stage of opening and closing action curve, action condition of each stage of GIS disconnecting switch can be obtained, such as whether the contact is in action, whether the contact movement and transmission mechanism are blocked or vibrated. The GIS disconnecting switch fault type can be determined conveniently and effectively, and whether the GIS disconnecting switch is opened and closed in place can be judged.

[0008] Preferably, the step S4 comprises: if the stator current of the motor of the operating mechanism of the GIS disconnecting switch is greater than a preset current threshold, the contact of the GIS disconnecting switch is stuck; if the stroke data during opening and closing are within a preset stroke threshold range, the GIS disconnecting switch is in good condition; and if the stroke data during opening and closing are not within the preset stroke threshold range, the fault type is output in combination with the database under different faults of the GIS disconnecting switch.

[0009] Preferably, the step S2 comprises: pre-processing the collected angle displacement signal, filtering the pre-processed angle displacement signal, analog-digital converting the measured angle displacement signal, and calculating opening and closing speed of the GIS disconnecting switch and stroke of the moving contact of the GIS disconnecting switch according to the angle displacement signal.

[0010] Preferably, in the opening and closing curve, the moment of three-phase state change of the GIS disconnecting switch is the demarcation point of opening and closing time and contact contact movement time, the total opening and closing time is obtained according to the time of reaching the top end of the movement curve, the synchronization of three-phase opening and closing of the GIS disconnecting switch is judged according to comparative analysis of the opening and closing time, and the internal contact arc burning condition of the GIS disconnecting switch is analyzed.

[0011] Preferably, the conversion of the angle displacement signal into stroke data comprises: differentiating the angle displacement signal to obtain angular velocity, obtaining tangential velocity by using the angular velocity and the transmission crank length of the GIS disconnecting switch, calculating the contact speed of the GIS disconnecting switch by using the tangential velocity, and obtaining the stroke of the contact of the GIS disconnecting switch by using the contact speed.

[0012] Preferably, the establishing the opening and closing action curve according to the stroke data comprises: constructing an opening and closing action curve of the disconnector, the opening and closing action curve being a quantity of the opening and closing movement of the disconnector with respect to time, stroke or angle, by taking time as the horizontal coordinate and angle or stroke of the disconnector contact as the vertical coordinate.

[0013] Preferably, the time is an action time during the opening and closing of the disconnector, the action time comprising a disconnector opening and closing time and a contact contact movement time, the contact contact movement time being a time from the start of the movement of the contact to the separation or a time from the high contact of the contact to the completion of the movement.

[0014] Preferably, the step S1 comprises the collected angle displacement signal comprising a rotation angle of a transmission crank of the disconnector and a rotation angle of a transmission connecting rod.

[0015] A multi-parameter-based fault diagnosis system of a GIS disconnector comprises: A trigger circuit sends an opening and closing signal to a control power supply of a motor of an operating mechanism of the GIS disconnector to control the action of the GIS disconnector. A data acquisition module acquires a motor current of the operating mechanism of the GIS disconnector, a rotation angle of a transmission crank of the disconnector and a rotation angle of a transmission connecting rod when the GIS disconnector is opened and closed. A fault diagnosis module performs angle displacement data processing, linear velocity measurement and contact stroke deduction of the GIS disconnector according to the data acquired by the data acquisition module, calculates a distance and a velocity of the GIS contact, and outputs a fault type according to a trajectory characteristic and a time characteristic of the angle displacement data.

[0016] Preferably, the fault diagnosis module comprises: A filter anti-interference module filters interference information in the signal acquired by the data acquisition module. An A / D digital-to-analog conversion module converts the filtered digital signal into an analog signal. A central processing unit calculates an opening and closing velocity of the GIS disconnector and a stroke of a moving contact of the GIS disconnector, analyzes a contact opening distance and a closing insertion depth of the GIS disconnector through the stroke or angle data of the GIS disconnector, and judges whether the GIS disconnector has an opening and closing misplacement or a contact fault.

[0017] Therefore, the application has the following beneficial effects: 1. The opening and closing distance and the closing insertion depth of the GIS disconnector are analyzed through the stroke or angle data of the GIS disconnector, and then whether the disconnector is opened and closed to the position can be judged, so that the safe and stable operation of the equipment and the power grid is ensured, the calculation process is simple, and the detection precision is high.

[0018] 2, through the state analysis of each stage of the opening and closing action curve, the action condition of each stage of the GIS disconnector can be obtained, such as whether the contact moves, whether the transmission mechanism is blocked or vibrates, so that the fault type of the GIS disconnector can be determined conveniently and effectively. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall step flow chart of the GIS disconnector fault diagnosis method based on multiple parameters in the application.

[0020] Figure 2 The processing process flow chart of the angular displacement signal in the application.

[0021] Figure 3 The opening and closing action curve constructed in example one.

[0022] Figure 4 The motor current curve of the GIS disconnector before maintenance in example one.

[0023] Figure 5 The motor current curve of the GIS disconnector before maintenance in example one.

[0024] Figure 6 The motor current curve after maintenance treatment in example one.

[0025] Figure 7 The architecture schematic diagram of the GIS disconnector fault diagnosis system based on multiple parameters in example two.

[0026] Figure 8 The GIS disconnector fault determination schematic diagram of the GIS disconnector fault diagnosis system based on multiple parameters in example two.

[0027] Figure 9 The fault diagnosis flow chart of the GIS disconnector fault diagnosis tester based on multiple parameters in example two.

[0028] In the figure: 1, central processing unit; 2, communication module; 3, A / D conversion module; 4, filter anti-interference module; 5, protection circuit; 6, battery power supply module; 7, display module; 8, angular displacement sensor; 9, current sensor; 10, power adapter; 11, trigger module. DETAILED DESCRIPTION

[0029] The application will be described in further detail below in combination with the drawings and specific embodiments: Example one: The application provides a GIS disconnector fault diagnosis method based on multiple parameters, as shown in the following steps: Figure 1As shown, the operation process is as follows: Step 1, collect the motor winding current when the GIS disconnector switches open and close, and convert the current data into a current-time waveform; Step 2, collect and process the angular displacement signal when the GIS disconnector switches open and close, convert the angular displacement signal into stroke data, and establish an opening and closing action curve based on the stroke data; Step 3, analyze the continuous process of each action stage of the opening and closing of the GIS disconnector switches based on the opening and closing action curve and the current-time waveform, and determine whether the opening and closing of the GIS disconnector switches is normal.

[0030] GIS, or Gas Insulated Switchgear, consists of circuit breakers, disconnectors, grounding switches, current transformers, voltage transformers, surge arresters, busbars, connectors, and outgoing terminals. All these devices and components are enclosed in a grounded metal casing filled with pressurized SF6 insulating gas, hence the name SF6 fully enclosed switchgear. The disconnectors in GIS are sealed within an insulating cylinder, so the opening and closing positions of the moving and stationary contacts cannot be directly observed. Their operational status can only be indirectly determined by the position pointer on the mechanism box, the opening / closing indicator lights in the control cabinet, and the background position indicator. Furthermore, GIS disconnectors may suffer from faults such as broken drive shaft sleeves, broken shafts due to poor connecting rod material, incorrect position of the limit switch leading to incomplete opening / closing, insufficient opening distance between moving and stationary contacts, or position detection failure. If these faults are not detected promptly, they can lead to accidents such as "operating a disconnector under load" and "energizing with the grounding switch connected," which in severe cases can endanger the overall operation of the power grid and threaten the personal safety of users.

[0031] The multi-parameter-based GIS disconnector fault diagnosis method provided in this embodiment analyzes the contact opening distance and closing insertion depth of the GIS disconnector by analyzing data such as its stroke or angle. This allows the method to determine whether the disconnector has reached the correct opening or closing position, thereby ensuring the safe and stable operation of the equipment and the power grid. The calculation process is simple and the detection accuracy is high. Furthermore, by analyzing the state of each stage of the opening and closing action curve, the method can determine the action status of the GIS disconnector at each stage, such as whether the contacts have moved, whether the contact movement and transmission mechanism are jammed or vibrating. This allows for convenient and effective identification of the GIS disconnector fault type.

[0032] The following examples and specific application scenarios further illustrate the technical solution and effects of the present invention. The following examples are explanations of the present invention, but the present invention is not limited to the following examples.

[0033] The fault characteristics or defect categories of GIS equipment, such as GIS disconnect switches, are diverse, indicating that the causes of GIS disconnect switch malfunctions or abnormalities are varied. These include installation misalignment, design flaws, internal impurities, abnormal internal insulating gas, excessive moisture, insufficient internal pressure, external equipment corrosion, water leakage, and damage caused by harsh external conditions. Some GIS disconnect switches are equipped with online partial discharge monitoring devices, but even these devices often struggle to identify the cause of malfunctions. Further fault diagnosis typically involves electrical characteristic tests such as insulation withstand voltage tests or contact resistance measurements. Sometimes, however, electrical tests fail to detect the GIS fault, necessitating further opening of the disconnect switch to observe its internal components and determine the specific fault type. This inspection process is extremely labor-intensive for power grid maintenance personnel, significantly increasing the difficulty of inspection and routine maintenance. Therefore, it is necessary to research and adopt new intelligent methods to more conveniently and effectively identify fault types.

[0034] Therefore, this embodiment provides a fault diagnosis method for GIS disconnect switches based on multiple parameters, which is as follows: First step: Collect the motor winding current when the GIS disconnect switch is opened and closed, and convert the current data into a current-time waveform.

[0035] Using a current sensor, the motor current values ​​of the GIS disconnect switch under test from the open position to the closed position and from the closed position to the open position are collected, and the collected current values ​​are converted into current-time waveforms.

[0036] Step 2: Collect and process the angular displacement signal when the GIS disconnector switches open and close, convert the angular displacement signal into stroke data, and establish the opening and closing action curve based on the stroke data.

[0037] By processing the angular displacement data, measuring the tangential velocity, and deducing the contact stroke of the GIS disconnector, the fault type can be output based on its trajectory characteristics, time characteristics, temperature characteristics, etc. in subsequent processes.

[0038] like Figure 2 As shown, the processing of angular displacement signals includes: preprocessing and filtering of angular displacement signals, analog-to-digital conversion of angular displacement sensor signals, and then calculation of the opening and closing speed of GIS disconnecting switches, calculation of the travel of the moving contact of GIS disconnecting switches, and storage and transmission of relevant data based on the processed angular displacement signals.

[0039] The preprocessing process includes the extraction of angular displacement signals and the removal of abnormal angular displacement signals.

[0040] The main tests include the motor current of the operating mechanism, the rotation angle of the transmission crank arm, and the rotation angle of the transmission connecting rod. The distance, speed, and time of contact travel are calculated to comprehensively determine whether the disconnecting switch has faults such as incomplete opening and closing, contact jamming, poor contact, or contact failure to separate.

[0041] The opening and closing action curve represents the change in the travel or angle of the disconnecting switch's opening and closing motion over time. The opening and closing speed is the average speed calculated from the action curve. Ideally, the opening and closing action curve is a linear curve, meaning the transmission and contact movement of the disconnecting switch mechanism are at a constant speed. By analyzing the state of each stage of the curve, the action status of each stage can be determined, such as whether the contacts have moved, and whether there is any jamming or vibration in the contact movement and transmission mechanism.

[0042] Step 3: Analyze the continuous process of each action stage of the GIS disconnector contact opening and closing based on the opening and closing action curves and current-time waveforms to determine whether the GIS disconnector is operating normally.

[0043] Furthermore, the opening and closing action curves (i.e., GIS disconnector characteristic test curves) constructed in this embodiment are as follows: Figure 3 As shown, the vertical axis of the opening and closing action curve represents the angle or contact travel. This physical field represents the change in distance or rotation angle of the disconnecting switch during its movement. This distance physical field and the angle physical field can be easily converted through mathematical relationships.

[0044] The total travel of a GIS disconnector is divided into the opening distance travel and the contact travel, which correspond to the opening angle and contact angle, respectively. When the opening angle increases from 0° to the critical value between the opening angle and the contact angle, the three phases (A, B, and C) of the GIS disconnector are just making contact. This state is an unstable transitional state. As the angle increases, the state enters the contact angle portion. Therefore, after the contact angle reaches its peak value, the GIS disconnector contacts reach their limit state, and the rotation control should end.

[0045] like Figure 3 As shown, auxiliary line A represents the point where the contacts just make contact, and auxiliary line B represents the maximum travel distance during normal contact. The most important physical field for auxiliary lines A and B is the relationship between time and travel. Auxiliary lines C and D represent the initial and limit states of the contact travel, and the most important physical field for them is the rotation angle.

[0046] The horizontal axis of the opening and closing action curve represents time, indicating the action time during the opening and closing of the disconnecting switch. By analyzing the duration of each action stage of the disconnecting switch contacts through this physical field of time, we can determine whether the disconnecting switch is operating normally. The action time includes the opening and closing time and the contact contact movement time. The contact contact movement time refers to the time from the start of contact movement to the moment of separation or from the moment of contact to the completion of movement. The point where the three-phase state of the disconnecting switch changes (at moment A, auxiliary line) coincides with the action curve is the dividing point between the opening and closing time and the contact contact movement time (see auxiliary lines A and C). The total opening and closing time can be calculated from the time the action curve reaches its peak (at moment B, auxiliary line). By comparing and analyzing the opening and closing times, we can determine the synchronization of the three-phase opening and closing and analyze the severity of internal contact arcing.

[0047] If the stator current of the motor of the GIS disconnector operating mechanism is greater than the preset current threshold, the GIS disconnector contacts are stuck; the current-time waveform and the pre-stored normal current-time waveform are compared and analyzed to obtain the status judgment result.

[0048] Furthermore: Extract the characteristic parameters of the operating curve and the corresponding time from the normal operating current waveform of the GIS disconnector from the closed to the open position. Similarly, extract the characteristic parameters of the current operating curve and compare the two characteristic curves: if no waveform characteristic quantity appears or is too small, it indicates that the motor is disconnected; if the operating time is too long, there is mechanical jamming; if the fluctuation during the stable period is large, jamming occurs in this section, etc.

[0049] If the travel data during opening and closing are within the preset travel threshold range, the GIS disconnector is in good condition; if the travel data during opening and closing are not within the preset travel threshold range, the fault type is output based on the database of different faults of the GIS disconnector.

[0050] Furthermore, the fault diagnosis method for GIS disconnectors based on multi-parameter parameters provided in this embodiment was used to test the ZF9-252 disconnector. The test results are as follows: Figure 4 and Figure 5 As shown in the figure, the horizontal axis represents time, and the vertical axis represents current. Figure 5 The motor current curve when the GIS disconnect switch is closed before maintenance and Figure 5 The motor current curve during the opening of the GIS disconnect switch before maintenance indicates that the stator current of the motor of the GIS disconnect switch operating mechanism is large, indicating that the output power is large and the contacts are stuck.

[0051] The motor current waveform after maintenance is as follows: Figure 6 As shown, the test is now passed.

[0052] Simultaneously, angular displacement data during the opening and closing of the GIS disconnector was measured. The angular displacement curve was converted into stroke data, and typical data were selected to obtain: The data in the table shows that the travel data are all within the preset travel threshold range, indicating that the GIS disconnector contacts are in the correct opening and closing position and are in good condition.

[0053] In addition, this embodiment also tested other models of GIS disconnect switches, and obtained the following data: When the obtained travel data is unqualified, we can further diagnose the fault by using the opening and closing action curves.

[0054] Example 2: This embodiment provides a multi-parameter-based GIS disconnector fault diagnosis system for executing the multi-parameter-based GIS disconnector fault diagnosis method in Embodiment 1.

[0055] Specifically: like Figure 7 As shown, a multi-parameter-based GIS disconnector fault diagnosis system includes: a trigger module 11, a data acquisition module, a fault diagnosis module, a communication module 4, a display module 7 (a monitor in this embodiment), a power adapter 10, a power supply module 6, and a protection circuit. The trigger module is connected to the fault diagnosis module, the data acquisition module is connected to the GIS disconnector, the fault diagnosis module is connected to both the data acquisition module and the GIS disconnector, the fault diagnosis module communicates with the upper-level control system of the power grid via the communication module, and is also connected to the display module via the communication module. The fault diagnosis module is also connected to the protection circuit, which is connected to the battery power supply module and the power adapter.

[0056] The trigger module is used to send opening and closing signals to the control power supply of the motor of the GIS disconnector switch operating mechanism to control the operation of the GIS disconnector switch.

[0057] The data acquisition module is used to collect the motor current, transmission crank arm rotation angle, and transmission link rotation angle of the GIS disconnector switch operating mechanism when the GIS disconnector switch is operated.

[0058] Furthermore, the data acquisition module includes an angle sensor 8 and a current sensor 9. These are external sensors of the system, connected to the system's response interface via data cables. When the GIS disconnect switch operates, the angle sensor and current sensor respectively acquire the corresponding state values. These state values ​​are filtered by an anti-interference filtering circuit and then sent to the central processing unit (CPU) via an A / D converter. The CPU calculates the required parameters based on an algorithm.

[0059] Specifically, the angle sensor is used to measure the rotation angle of the outer crank arm of the GIS disconnect switch, and the current sensor is used to measure the current in the motor winding of the GIS disconnect switch.

[0060] In this embodiment, the angle sensor is a magnetic angular displacement sensor, which measures 360 degrees of absolute position and outputs via RS-485. This interface uses a combination of a balanced driver and a differential receiver, enhancing its common-mode interference immunity, i.e., good noise immunity. The sensor uses a 5V DC power supply, with an output of 0-5V, a torque of <5mN·m, an update speed of 0.2ms, and a resolution of 0.022°.

[0061] When in use, the angle sensor is fixed on the bracket, which can rotate 360 ​​degrees to meet the measurement of most angles. The bracket connecting rod is also slightly extended, and the bracket base is a magnetic base that can be attached to the equipment to meet the on-site measurement conditions and facilitate measurement.

[0062] Data acquisition requirements: Test the operation of GIS disconnect switches, with the operation measurement time appropriately extended from the original 200ms to 3000ms, and the sampling accuracy reaching 0.1ms, which can completely record the operation of various disconnect switches; the sensor bracket rotation angle is 360°, which can mainly measure the stroke of GIS disconnect switches to obtain the opening and closing time, opening distance, contact stroke, and secondary opening and closing action signaling time of the disconnect switches.

[0063] During measurement, the angle sensor is tightly attached to the outer crank arm. When the GIS disconnect switch motor drives the outer crank arm to rotate, the angular displacement sensor also rotates. The obtained angle data can be converted to obtain the rotation angle of the inner crank arm and the travel distance of the contact.

[0064] In this embodiment, the current sensor is an ETCR007AD AC current clamp sensor, which adopts an open-close structure and does not require disconnecting the detection circuit. It is an iron-core current sensor Hall sensor with stable performance and high accuracy. It can output current or voltage signals with a range of 0mA-50A AC / DC, a resolution of 1mA, an accuracy class of 3%FS, and an output signal of 10mV / 1A or 100mV / 1A (manual switching).

[0065] After powering on, the current sensor needs to be zeroed by selecting the appropriate range before testing. Before testing, the clamp head can be brought close to the wire being tested. The current sensor will output a voltage (interference from the external electric field). The zeroing button can be used to zero the interference. Then, the current sensor can be clamped onto the wire to improve the accuracy of the measurement data.

[0066] In other embodiments, the rotation angle of the GIS disconnect switch can also be measured using a photoelectric sensor. A scale with multiple light-transmitting holes is clamped on the rotating spindle. The number of light-transmitting holes depends on the measurement accuracy of the angle, such as one hole for 1°, 2°, 5°, etc.

[0067] Specifically, a photoelectric sensor converts light signals into electrical signals. When the light intensity changes, the electrical signal also changes, ultimately achieving the purpose of transmitting information. Typically, a sensor consists of three parts: a light transmitter, an optical path, and a receiver.

[0068] The light transmitter emits a beam of light towards the target. The light source for this beam is typically a laser diode, a light-emitting diode (LED), a semiconductor light source, or an infrared emitting diode. The optical path refers to optical elements such as lenses and apertures, or rotating light-blocking bodies. The receiver typically uses photodiodes, phototransistors, or photovoltaic cells. Following this is the detection circuit, which filters out the valid signal and transmits it. Photoelectric sensors are classified into different structural types according to their applications. These include slot-type photoelectric sensors, through-beam photoelectric sensors, reflector-type photoelectric switches, and diffuse reflection-type photoelectric switches. Slot-type photoelectric sensors are particularly suitable. Slot-type photoelectric sensors are through-beam type; one side of the slot is the transmitter, and the other is the receiver. When the object being measured passes through the middle of the slot, the emitted light is blocked, generating a signal. The object being measured is not subject to many constraints, making detection convenient. The response speed is also relatively fast, making detection very quick and convenient, and the error is very small, easily enabling speed measurement.

[0069] The fault diagnosis module processes the angular displacement data of the GIS disconnector switch, measures its linear velocity, and extrapolates the contact stroke based on the data acquired by the data acquisition module. It calculates the distance and speed of the GIS contact travel and outputs the fault type based on the trajectory and time characteristics of the angular displacement data. The module includes a central processing unit (CPU) 1, a filtering and anti-interference module 4, and an A / D conversion module 3. The CPU is connected to the trigger module, the GIS disconnector switch, the protection circuit, the communication module, and the A / D conversion module. The A / D conversion module is connected to the filtering and anti-interference module, which in turn is connected to the data acquisition module. The response status values ​​acquired by the data acquisition module are filtered by the filtering and anti-interference module before being sent to the CPU via the A / D conversion module. The CPU calculates the required parameters. These parameters are then displayed on the display module via the communication module.

[0070] The central processing unit includes a DSP. In this embodiment, the DSP is a TMS320C2000 series DSP, packaged in a 176-pin LQFP quad package, employing high-performance static CMOS technology, with an instruction cycle of 6.67ns and a clock speed of 150MHz. It also features a high-performance 32-bit CPU with a single-precision floating-point unit (FPU), using a Harvard pipeline architecture, enabling rapid interrupt response and a unified memory management mode. Complex mathematical algorithms can be implemented using C / C++. This allows for effective and robust data acquisition of the mechanical characteristics of 220kV GIS disconnectors, as well as algorithm execution and fault diagnosis.

[0071] Furthermore, the central processing unit of this fault diagnosis system uses a 176-pin TMS320F28335 chip as its main control chip. A 30MHz crystal oscillator and two 24pF filter capacitors are added to pins X1 and X2, forming the external input crystal oscillator system for the fault diagnosis system. The main control chip features convenient interface input / output, high calculation accuracy, high stability, and a high degree of integration, enabling easy and efficient high-speed calculation and control of the mechanical characteristics of GIS disconnect switches. The main control chip integrates a dedicated digital signal processing module, which greatly improves the system's digital signal processing capabilities. It also includes an analog-to-digital converter circuit, allowing for convenient configuration via control registers to fulfill the required control and data acquisition requirements.

[0072] In this embodiment, the A / D conversion module includes an AD7656 analog-to-digital converter (ADC). The AD7656 is an ADC with independent six-channel successive approximation (SAR) converters. Conversion processing and data accuracy are controlled by the CONVST signal and an internal crystal oscillator. Three CONVST pins allow independent synchronous sampling of three ADC channels; when the three CONVST pins are connected together, synchronous sampling of six channels is possible. The AD7656 ADC features high-speed parallel and serial interfaces, allowing it to interface with microprocessors and DSPs. When using the serial interface mode, the daisy-chain feature of the AD7656 ADC allows multiple ADCs to be connected to a single serial interface.

[0073] First, the CONVST pin is controlled by the MCU or DSP to initiate the conversion, and this signal is kept high. After the AD7656 analog-to-digital converter (ADC) initiates the conversion, it automatically outputs a BUSY signal. The falling edge of the BUSY signal indicates that the conversion is complete. At this point, the converted data is stored in the six registers inside the AD7656 ADC. Then, the six channel ADC conversion values ​​are read sequentially by controlling the chip select (CS) and read (RD) signals. After reading the ADC conversion values, CONVST is changed to a low level signal, and the CONVST pin remains high throughout the ADC conversion process.

[0074] Furthermore, in this embodiment, the AD7656 analog-to-digital converter employs iCMOS (industrial CMOS) technology. iCMOS technology is a manufacturing process that combines high-voltage semiconductor technology with submicron CMOS (complementary metal-oxide-semiconductor) and complementary bipolar processes. It enables the development of various high-performance analog ICs that can withstand 30V power supply voltages. iCMOS devices can withstand high power supply voltages while simultaneously improving performance, significantly reducing power consumption, and minimizing package size.

[0075] The fault determination is performed using the multi-parameter-based GIS disconnector fault diagnosis system provided in this embodiment. Figure 8 As shown, the left half mainly presents the electrical relationships and data measurements of the GIS disconnect switch, while the right half mainly presents the angular displacement data processing, tangential velocity measurement, and contact stroke deduction of the GIS disconnect switch, and outputs the fault type based on its trajectory characteristics, time characteristics, temperature characteristics, etc.

[0076] This embodiment also provides a multi-parameter-based GIS disconnector fault diagnosis tester. The tester includes a housing, which comprises a box and a top cover rotatably connected to the box. A multi-parameter-based GIS disconnector fault diagnosis system is installed inside the box. The tester has its own power supply. The instrument contains a rechargeable battery and can also be connected to an external power adapter. It has internal protection circuitry to prevent damage from transient interference or external short circuits.

[0077] The enclosure is equipped with a three-phase wiring port, a power output wiring port, a DIO wiring port, a trigger circuit switch, a power switch, as well as a circuit breaker, a remote / local switch, etc.

[0078] like Figure 9 As shown, the process of using this tester to perform fault diagnosis testing on GIS disconnect switches includes: Step (1): Ground the tester.

[0079] Step (2): Connect the angular displacement sensor to the crank arm of the GIS disconnect switch transmission mechanism, and connect the current sensor to the motor winding cable of the operating mechanism.

[0080] Step (3): Connect one end of the control data line to the control power supply of the motor of the isolating switch operating mechanism, and connect the other end to the trigger interface of the tester.

[0081] Step (4): Start the tester, initialize the internal diagnostic system of the tester and perform a self-test, enter the preparation state, open the operation interface, and select the equipment manufacturer and model.

[0082] Step (5): Press the "Detect" button on the tester. At this time, the trigger circuit sends an "on" or "off" signal to the motor control power supply, the isolation switch is activated, and the angular displacement sensor and current sensor collect the corresponding data respectively.

[0083] Step (6): After the isolating switch has completed its operation, the instrument's detection data has also been processed (including the extraction of characteristic values ​​and characteristic data). Data can be read, retrieved, or analyzed graphically on the display to perform fault diagnosis.

[0084] Step (7): Turn off the tester, disconnect the control data line, current sensor, angle sensor and control cable, disconnect the tester grounding wire, and the work is finished.

[0085] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A fault diagnosis method for GIS disconnect switches based on multi-parameter parameters, characterized in that, include: S1: Collect the motor winding current when the GIS disconnect switch is opened and closed, and convert the current data into a current time waveform; S2: Collect and process the angular displacement signal when the GIS disconnect switch is opened and closed, convert the angular displacement signal into stroke data, and establish the opening and closing action curve based on the stroke data; S4: Analyze the continuous process of each action stage of the GIS disconnector contact opening and closing based on the opening and closing action curve and current-time waveform to determine whether the GIS disconnector is operating normally.

2. The fault diagnosis method for GIS disconnect switches based on multi-parameter parameters according to claim 1, characterized in that, Step S4 includes: if the stator current of the motor of the GIS disconnector operating mechanism is greater than the preset current threshold, then the GIS disconnector contact is stuck; if the travel data during opening and closing are within the preset travel threshold range, then the GIS disconnector is in good condition; if the travel data during opening and closing are not within the preset travel threshold range, the fault type is output by combining the database of different faults of the GIS disconnector.

3. The fault diagnosis method for GIS disconnect switches based on multi-parameter parameters according to claim 1, characterized in that, Step S2 includes: preprocessing the acquired angular displacement signal and filtering the preprocessed angular displacement signal; performing analog-to-digital conversion on the measured angular displacement signal; and calculating the opening and closing speed of the GIS disconnector and the travel of the moving contact of the GIS disconnector based on the angular displacement signal.

4. A fault diagnosis method for GIS disconnect switches based on multi-parameter parameters according to claim 1 or 3, characterized in that, In the opening and closing curve, the instant when the three-phase state of the GIS disconnector changes is the dividing point between the opening and closing time and the contact movement time. The total opening and closing time is obtained based on the time when the movement curve reaches the top. Based on the comparison and analysis of the opening and closing time, the synchronization of the three-phase opening and closing of the GIS disconnector is determined, and the arcing of the internal contacts of the GIS disconnector is analyzed.

5. A fault diagnosis method for GIS disconnect switches based on multi-parameter parameters according to claim 1, 2, or 3, characterized in that, The process of converting the angular displacement signal into travel data includes: differentiating the angular displacement signal to obtain the angular velocity; using the angular velocity and the length of the GIS disconnector drive crank arm to obtain the tangential velocity; using the tangential velocity to calculate the GIS disconnector contact velocity; and using the contact velocity to obtain the GIS disconnector contact travel.

6. A fault diagnosis method for GIS disconnect switches based on multi-parameter parameters according to claim 1 or 3, characterized in that, The step of establishing the opening and closing action curve based on the travel data includes: using the horizontal axis to represent time and the vertical axis to represent angle or GIS disconnector contact travel, constructing the disconnector opening and closing action curve, wherein the opening and closing action curve is the amount of travel or angle that changes with time in the opening and closing movement of the disconnector.

7. The fault diagnosis method for GIS disconnect switches based on multi-parameter parameters according to claim 6, characterized in that, The time quantity refers to the operating time during the opening and closing of the GIS disconnector switch. The operating time includes the opening and closing time of the GIS disconnector switch and the contact movement time of the GIS disconnector switch outlet. The contact movement time is the time from the start of contact movement to the moment of separation or the time from the moment of contact to the completion of movement.

8. A fault diagnosis method for GIS disconnect switches based on multi-parameter parameters according to claim 1, 2, or 3, characterized in that, Step S1 includes collecting angular displacement signals, including the rotation angle of the GIS disconnector drive crank arm and the rotation angle of the drive linkage.

9. A fault diagnosis system for GIS disconnect switches based on multiple parameters, employing the fault diagnosis method for GIS disconnect switches based on multiple parameters as described in any one of claims 1-8, characterized in that, include: The trigger module sends opening and closing signals to the control power supply of the motor of the GIS disconnector switch operating mechanism to control the operation of the GIS disconnector switch; The data acquisition module collects the motor current, transmission crank arm rotation angle, and transmission link rotation angle of the GIS disconnector switch operating mechanism when the GIS disconnector switch is operated. The fault diagnosis module processes the angular displacement data of the GIS disconnector based on the data collected by the data acquisition module, measures the linear velocity, and extrapolates the contact stroke. It calculates the distance and speed of the GIS contacts and outputs the fault type based on the trajectory and time characteristics of the angular displacement data.

10. A fault diagnosis system for GIS disconnect switches based on multi-parameter parameters according to claim 9, characterized in that, The fault diagnosis module includes: The filtering and anti-interference module filters out interference information in the signals acquired by the data acquisition module. The A / D digital-to-analog converter module converts the filtered digital signal into an analog signal; The central processing unit calculates the opening and closing speed of the GIS disconnector and the travel of the moving contact of the GIS disconnector. By analyzing the travel or angle data of the GIS disconnector, it determines whether the GIS disconnector is not opening or closing properly or whether there is a contact fault.

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