Inflation device for SF6 equipment and fault detection method

Abstract

According to the gas charging device for the SF6 equipment and the fault detection method, the gas charging device establishes a gas charging pipeline between a gas source and the SF6 equipment through the gas charging connector, meanwhile, characteristic parameters such as the internal pressure of the SF6 equipment, the accumulated charged gas quality and the environment temperature are collected in real time in the gas charging process by means of the sensing assembly, extra detection work does not need to be carried out, and the detection efficiency is improved. And the air supply operation and the fault monitoring are synchronously carried out, so that the working efficiency is greatly improved. Moreover, the control device calculates the actual volume constant of the SF6 equipment based on the characteristic parameters, and judges whether a cavity defect occurs in the SF6 equipment or not by comparing the actual volume constant with a standard volume constant, so that timely identification can be performed at the initial stage of occurrence of internal faults such as cracking of an insulating part, and the problems that the internal faults of the SF6 equipment are high in concealment and difficult to perceive in the early stage in a traditional mode are effectively solved. Therefore, risks of internal discharge and even explosion of equipment caused by fault development are avoided, and safe and stable operation of a power system is powerfully guaranteed.

Description

Technical Field

[0001] This application generally relates to the field of SF6 equipment inflation technology, and specifically to an inflation device and fault detection method for SF6 equipment. Background Technology

[0002] In recent years, with the continuous growth of social electricity demand, the number of newly built and expanded substations has increased significantly. Among them, the number of SF6 circuit breakers and GIS equipment (hereinafter collectively referred to as "SF6 equipment"), which are core components of switchgear, has also increased rapidly. Affected by factors such as the age of the equipment, aging condition, and differences in installation process, SF6 equipment leakage occurs frequently, making SF6 equipment replenishment a frequent and critical task for power maintenance personnel.

[0003] The internal health of SF6 equipment is directly related to the safe and stable operation of the entire power system. However, when additional cavities appear inside SF6 equipment due to cracks or detachment of insulation components, there are often no external manifestations in the early and development stages, making it highly concealed. If it is not detected in time, it can easily lead to internal discharge of the equipment, and even some equipment may be at risk of explosion, seriously threatening the reliable operation of the power grid. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an inflation device and fault detection method for SF6 equipment that can solve the above-mentioned technical problems.

[0005] In a first aspect, this application provides an inflation device for SF6 equipment, comprising: An inflation connector, one end of which is connected to the SF6 equipment and the other end of which is connected to the gas source; the inflation connector is used to establish an inflation pipeline between the gas source and the SF6 equipment; A sensing component is provided on the inflation pipeline and the SF6 equipment. The sensing component is used to collect characteristic parameters in real time during the inflation process. The characteristic parameters include at least: the internal pressure of the SF6 equipment, the cumulative mass of gas filled, and the ambient temperature. A control device, communicatively connected to the sensing component, is configured to: Based on the aforementioned characteristic parameters, the actual volume constant of the SF6 equipment is calculated; The difference between the actual volume constant and the standard volume constant is obtained as the volume constant difference value; Determine whether the difference in volume constants is greater than a first threshold; If so, it is determined that a cavity defect exists inside the SF6 equipment.

[0006] According to the technical solution provided in this application, the inflation connector includes: a first connector and a second connector. The first connector has a first channel extending through it along its axial direction, and the second connector has a second channel extending through it along its axial direction. One end of the first connector is inserted into the second connector so that the first channel and the second channel communicate to form the inflation pipeline. The end of the first connector away from the second connector is connected to the SF6 equipment, and the end of the second connector away from the first connector is connected to the air source. A check valve is provided in the second channel.

[0007] According to the technical solution provided in this application, the first connector and the second connector are connected by a self-locking structure, the self-locking structure comprising: An annular groove is circumferentially arranged around the outer wall of the first connector; A first through hole is circumferentially arranged around the second connector. A plurality of locking elements are arranged in a ring inside the first through hole. The locking elements can move radially along the second connector within the first through hole. A locking sleeve is fitted onto the end of the second connector that has the first through hole; a locking block is provided on the inner wall of the locking sleeve; An elastic energy storage assembly is disposed between the locking sleeve and the second connecting member, and the elastic energy storage assembly is used to provide a driving force for the locking sleeve to move along the axial direction of the second connecting member; When the first connector is connected to the second connector, the locking sleeve moves toward the first connector under the drive of the elastic energy storage component, and the locking block moves to correspond to the first through hole. At this time, the locking block presses the locking element radially into the annular groove to achieve self-locking connection.

[0008] According to the technical solution provided in this application, the elastic energy storage component includes: An elastic element is provided on the side of the locking block away from the first connecting member. One end of the elastic element is connected to the locking block, and the other end of the elastic element is connected to the outer wall of the locking sleeve. A stop ring is sleeved on the second connector and located on the side of the first through hole closer to the first connector; A limiting member is sleeved on the inner wall of the locking sleeve and located on the side of the locking block near the first connecting member. The limiting member is used to abut against the stop ring to restrict the movement of the locking sleeve toward the first connecting member.

[0009] According to the technical solution provided in this application, the sensing component includes: A reference pressure sensor is installed on the SF6 equipment and is used to collect the internal pressure of the SF6 equipment. A cumulative mass flow meter is installed inside the gas filling pipeline and is used to collect the cumulative mass of the gas filled in. A temperature sensor is installed inside the inflation pipeline and is used to collect the ambient temperature.

[0010] According to the technical solution provided in this application, the control device is further configured to: Based on the real-time acquisition results of the internal pressure of the SF6 equipment, time-series pressure data is generated; Based on the time-series pressure data, the adsorption rate constant was calculated using a nonlinear least squares fitting exponential model. Compare the adsorption rate constant with a preset adsorption rate reference range; Determine whether the adsorption rate difference exceeds the preset adsorption rate benchmark range; If so, the adsorbent inside the SF6 device is determined to be abnormal.

[0011] According to the technical solution provided in this application, the sensing component further includes: A mass flow meter is installed inside the inflation pipeline and is used to collect the instantaneous mass flow rate of the gas being filled into the inflation pipeline. A dynamic pressure sensor is installed inside the inflation line and is used to collect the pressure of the inflation line. The control device is also configured to: Based on the correlation analysis between the instantaneous mass flow rate and the pressure of the inflation pipeline; Determine whether the instantaneous mass flow rate is continuously lower than the second threshold and whether the inflation pipeline pressure is continuously higher than the third threshold; If so, the inflation line is determined to be blocked.

[0012] Secondly, this application provides a fault detection method based on the inflation device for SF6 equipment as described in any one of the first aspects, comprising the following steps: Based on the aforementioned characteristic parameters, the actual volume constant of the SF6 equipment is calculated; the characteristic parameters include at least: the internal pressure of the SF6 equipment, the cumulative mass of gas filled, and the ambient temperature; The difference between the actual volume constant and the standard volume constant is obtained as the volume constant difference value; Determine whether the difference in volume constants is greater than a first threshold; If so, it is determined that a cavity defect exists inside the SF6 equipment.

[0013] According to the technical solution provided in this application, the following steps are also included: Based on the real-time acquisition results of the internal pressure of the SF6 equipment, time-series pressure data is generated; Based on the time-series pressure data, the adsorption rate constant was calculated using a nonlinear least squares fitting exponential model. Compare the adsorption rate constant with a preset adsorption rate reference range; Determine whether the adsorption rate difference exceeds the preset adsorption rate benchmark range; If so, the adsorbent inside the SF6 device is determined to be abnormal.

[0014] According to the technical solution provided in this application, the following steps are also included: Correlation analysis based on instantaneous mass flow rate and inflation line pressure; Determine whether the instantaneous mass flow rate is continuously lower than a second threshold and whether the inflation line pressure is continuously higher than a third threshold. If so, the inflation line is determined to be blocked.

[0015] The beneficial effects of this application are as follows: This application provides a gas filling device and fault detection method for SF6 equipment. The filling device establishes a gas supply line between the gas source and the SF6 equipment via a filling connector. Simultaneously, sensing components collect characteristic parameters such as internal pressure, cumulative gas mass, and ambient temperature of the SF6 equipment in real time during the filling process. No additional detection work is required, allowing gas replenishment and fault monitoring to proceed simultaneously, significantly improving operational efficiency. Furthermore, the control device calculates the actual volume constant of the SF6 equipment based on these characteristic parameters and determines whether internal cavitation defects exist by comparing it with a standard volume constant. This enables timely identification of internal faults such as insulation component cracking in the early stages, effectively solving the problem of highly concealed internal faults in SF6 equipment and the difficulty in early detection using traditional methods. This avoids the risk of internal discharge or even explosion caused by the development of faults, strongly ensuring the safe and stable operation of the power system. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of an inflation connector for an inflation device used in SF6 equipment, provided in Embodiment 1 of this application; Figure 2This is a front sectional view of the first connector and the second connector provided in Embodiment 1 of this application when they are connected; Figure 3 This is a schematic diagram of the first connector provided in Embodiment 1 of this application; Figure 4 This is a front sectional view of the second connector provided in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the connection between the sensing component and the control device provided in Embodiment 1 of this application; Figure 6 This is a flowchart of a fault diagnosis method provided in Embodiment 2 of this application.

[0017] In the figure: 1. First connecting piece; 2. Second connecting piece; 3. Annular groove; 4. Locking sleeve; 5. Elastic element; 6. Stop ring; 7. Limiting element; 8. Locking block; 9. First protrusion; 10. Control device; 11. Reference pressure sensor; 12. Cumulative mass flow meter; 13. Temperature sensor; 14. Mass flow meter; 15. Dynamic pressure sensor; 16. Locking element. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1 Please refer to Figures 1-5 This application provides an inflation device for SF6 equipment, comprising: An inflation connector is used to establish an inflation pipeline between the gas source and the SF6 equipment. One end of the inflation connector is connected to the SF6 equipment, and the other end is connected to the gas source. The sensing components are installed in the inflation pipeline and the SF6 equipment. The sensing components are used to collect characteristic parameters in real time during the inflation process. The characteristic parameters include at least: the internal pressure of the SF6 equipment, the cumulative mass of gas filled, and the ambient temperature. Control device 10, which is communicatively connected to the sensing component, is configured to: Calculate the actual volume constant of the SF6 equipment based on the characteristic parameters; The difference between the actual volume constant and the standard volume constant is obtained as the volume constant difference value; Determine whether the difference in volume constants is greater than the first threshold; If so, it is determined that there is a cavity defect inside the SF6 equipment.

[0021] Specifically, in this embodiment, the control device 10 is preferably a host computer, which can be an industrial computer, an embedded industrial control computer, or a terminal device with data processing capabilities. It establishes a connection with the sensing components through a preset communication protocol, receives characteristic parameters such as the internal pressure of the SF6 device, the cumulative mass of the gas filled, and the ambient temperature in real time, and stores the data locally or in an associated database for subsequent analysis and traceability.

[0022] Specifically, the control device 10, based on the cumulative mass of gas injected, the change in SF6 equipment pressure, and the ambient temperature, uses the formula... Calculate the actual volume constant C of the SF6 equipment; in, The change in the mass of the gas being filled is the cumulative mass of the gas being filled collected in this application. The change in internal pressure of the SF6 equipment is obtained by subtracting the initial pressure before inflation from the real-time measured internal pressure of the SF6 equipment; T is the collected ambient temperature; R is the gas constant of SF6 gas (approximately 56.2 J / (kg·K)).

[0023] After obtaining the actual volume constant C, the control device 10 subtracts the calculated actual volume constant C from the standard volume constant (usually provided by the equipment manufacturer) to obtain the volume constant difference value. This volume constant difference value is then compared with a first threshold (in this embodiment, the first threshold is 10% of the standard volume constant). If the volume constant difference value is greater than the first threshold, it is determined that a cavity defect exists inside the SF6 equipment. Such defects are typically caused by faults such as cracked insulation components or the formation of additional cavities due to the detachment of internal parts. This diagnostic method can sensitively detect minute changes in the internal structure of the equipment, thereby achieving non-destructive assessment and early warning of its mechanical integrity.

[0024] Working Principle: This application establishes the gas supply and SF6 equipment inflation pipeline through an inflation connector. Simultaneously, sensing components collect characteristic parameters such as internal pressure, cumulative gas mass, and ambient temperature of the SF6 equipment in real time during inflation, eliminating the need for additional testing. This allows for simultaneous gas replenishment and fault monitoring, significantly improving operational efficiency. Furthermore, the control device 10 calculates the actual volume constant of the SF6 equipment based on these characteristic parameters. By comparing this constant with a standard volume constant, it determines whether internal cavitation defects have occurred. This enables timely identification of internal faults, such as insulation component cracking, in the early stages. It effectively solves the problem of highly concealed internal faults in SF6 equipment and the difficulty in early detection using traditional methods, thereby avoiding the risk of internal discharge or even explosion due to fault development and strongly ensuring the safe and stable operation of the power system.

[0025] In some embodiments, the inflation connector includes: a first connector 1 and a second connector 2. The first connector 1 has a first channel extending through it along its axial direction, and the second connector 2 has a second channel extending through it along its axial direction. One end of the first connector 1 is inserted into the second connector 2 so that the first channel and the second channel are connected to form an inflation pipeline. The end of the first connector 1 away from the second connector 2 is connected to the SF6 equipment, and the end of the second connector 2 away from the first connector 1 is connected to the air source. A check valve is provided in the second channel.

[0026] Specifically, such as Figure 1 and Figure 2 As shown, the gas inflator is a quick-connect fitting designed for SF6 equipment, aiming to achieve a fast, reliable, and sealed fluid channel connection. The fitting mainly includes a first connector 1 (as an adapter for connecting to the SF6 equipment interface) and a second connector 2 (as the main body for connecting to the gas source). Both the first connector 1 and the second connector 2 are preferably made of brass, which possesses good mechanical strength, wear resistance, corrosion resistance, and chemical stability against SF6 gas. Its plug-in integrated design allows it to adapt to various models and specifications of SF6 electrical equipment, achieving a "universal compatibility" effect and significantly improving the versatility and efficiency of field work. Specifically, in this embodiment, the gas source is a gas cylinder containing SF6 gas, and the gas cylinder is connected to the second connector 2 via an inflation hose.

[0027] Specifically, to ensure absolute safety during the inflation process and prevent gas backflow, a check valve (also known as a one-way valve) is integrated into the second channel of the second connector 2. This check valve ensures that SF6 gas can only flow unidirectionally from the gas source side to the equipment side, effectively preventing the high-pressure SF6 gas inside the equipment from back-impacting the inflation hose and gas cylinder side when the connector is plugged in or when the gas source pressure fluctuates, thus eliminating the risk of personal injury and gas leakage that may result.

[0028] In some embodiments, the first connector 1 and the second connector 2 are connected by a self-locking structure, the self-locking structure comprising: An annular groove 3 is circumferentially arranged around the outer wall of the first connector 1; The first through hole is circumferentially arranged around the second connector 2. A plurality of locking elements 16 are arranged in a ring inside the first through hole. The locking elements 16 can move radially along the second connector 2 within the first through hole. Locking sleeve 4 is sleeved on the end of the second connecting member 2 that has a first through hole; locking block 8 is provided on the inner wall of locking sleeve 4; An elastic energy storage component is disposed between the locking sleeve 4 and the second connecting member 2. The elastic energy storage component is used to provide a driving force for the locking sleeve 4 to move along the axial direction of the second connecting member 2. When the first connector 1 is connected to the second connector 2, the locking sleeve 4 moves toward the first connector 1 under the drive of the elastic energy storage component, and the locking block 8 moves to correspond to the first through hole. At this time, the locking block 8 presses the locking element 16 radially into the annular groove 3 to achieve self-locking connection.

[0029] Specifically, such as Figure 1 and Figure 2 As shown, the first connecting member 1 and the second connecting member 2 achieve a fast and reliable connection through a unique self-locking structure. The core of this self-locking structure lies in the coordinated cooperation of its annular groove 3, locking elements 16, locking sleeve 4, and elastic energy storage assembly. Specifically, the annular groove 3 is circumferentially arranged around the outer wall of the first connecting member 1 to form a reliable locking position; a corresponding circumferentially arranged first through hole is provided on the second connecting member 2, and multiple radially movable locking elements 16 are arranged in a ring inside the hole. In this embodiment, the locking elements 16 are steel balls; the locking sleeve 4, sleeved on the end of the second connecting member 2, has a locking block 8 on its inner wall; and the elastic energy storage assembly, located between the locking sleeve 4 and the second connecting member 2, provides a stable axial driving force for the locking sleeve 4.

[0030] Specifically, in this embodiment, a first guide slope is provided on the side of the locking block 8 near the first connecting member 1. When the locking sleeve 4 moves axially, the first guide slope converts the axial driving force it receives into a radial component force through contact with the locking element 16, thereby reliably pressing the locking element 16 to move inward. The innovative working process of this self-locking structure is as follows: When the first connector 1 is inserted into the second connector 2, the locking sleeve 4 automatically moves towards the first connector 1 under the drive of the elastic energy storage component, causing the locking block 8 on the inner wall of the locking sleeve 4 to move precisely to the position corresponding to the first through hole. At this time, the locking block 8 effectively constrains the locking element 16 from the radial outside, forcing all locking elements 16 to move radially inward synchronously, and finally reliably engage in the annular groove 3 of the first connector 1, realizing automatic mechanical locking of the connection. This ingenious design ensures the speed and reliability of the connection, while effectively preventing accidental loosening through the mechanical self-locking mechanism, greatly improving the safety and operational efficiency of inflation operations.

[0031] In some embodiments, the resilient energy storage component includes: The elastic element 5 is disposed on the side of the locking block 8 away from the first connecting member 1. One end of the elastic element 5 is connected to the locking block 8, and the other end of the elastic element 5 is connected to the outer wall of the locking sleeve 4. In this embodiment, the elastic element 5 is a spring. The stop ring 6 is sleeved on the second connector 2 and is located on the side of the first through hole near the first connector 1; The limiting member 7 is sleeved on the inner wall of the locking sleeve 4 and is located on the side of the locking block 8 near the first connecting member 1. The limiting member 7 is used to abut against the stop ring 6 to restrict the movement of the locking sleeve 4 toward the first connecting member 1.

[0032] Specifically, such as Figure 3 As shown, a first protrusion 9 is also provided on the outer wall of the first connector 1 and on the side of the annular groove 3 near the second connector 2. The first protrusion 9 is arranged circumferentially around the outer wall of the first connector 1. In this embodiment, as Figure 4 As shown, the limiting member 7 has a second guide ramp on one side near the first connecting member 1 and a third guide ramp on the other side. When disconnection is required, the locking sleeve 4 is pulled backward, and the limiting member 7 on it moves accordingly, causing the second guide ramp to abut against the fixed stop ring 6. This abutment precisely limits the axial displacement of the locking sleeve 4, stabilizing it in the pre-disconnection position and forcing the internal elastic member 5 to maintain a pre-compressed energy-storing state. At the same time, the second and third guide ramps together form a bidirectional flexible bridging mechanism. This mechanism allows the limiting member 7, which originally has a large radial dimension, to smoothly generate a small radial elastic deformation or guide the component to displace under the action of axial force through the guiding and yielding effect of its ramps, thereby smoothly and controllably crossing the fixed stop ring 6.

[0033] Specifically, the connection and separation process of the self-locking structure is achieved through a series of precise mechanical linkages, and the specific working process is as follows: When the first connector 1 is inserted into the second connector 2, the first protrusion 9 at its front end first contacts the locking element 16, pushing the locking element 16 to move radially outward. The locking element 16 then pushes against the limiting element 7, causing the limiting element 7 to undergo radial displacement, resulting in the separation of the second guide slope on it from the stop ring 6. At this time, the elastic element 5, which is always in a pre-compressed state, instantly releases its stored elastic potential energy, driving the locking sleeve 4 to move rapidly towards the first connector 1. As the locking sleeve 4 moves axially, the locking block 8 on its inner wall moves precisely to the radial position corresponding to the first through hole, forming an effective circumferential constraint on the locking element 16 from the outside, forcing all locking elements 16 to move radially inward synchronously, and finally reliably engaging into the annular groove 3 of the first connector 1, completing the automatic mechanical locking of the connection.

[0034] When disconnection is required, the operator pulls the locking sleeve 4 backward, causing the locking block 8 on its inner wall to move away from the locking through hole, thus releasing the radial constraint on the locking element 16. The locking element 16 then gains radial movement space, at which point the first connecting piece 1 can be pulled out from the second connecting piece 2. During the backward movement of the locking sleeve 4, the limiting member 7 moves accordingly until its second guide slope re-forms an abutment fit with the stop ring 6, stably restricting the locking sleeve 4 in the pre-disconnection position and causing the elastic member 5 to re-enter the pre-compressed energy storage state, preparing for the next connection.

[0035] This design, through clever inclined plane guidance and mechanical linkage, achieves quick insertion and removal of the connector and reliable self-locking, ensuring both ease of operation and mechanical stability in the connected state.

[0036] In some implementations, the sensing component includes: Reference pressure sensor 11 is installed on the SF6 equipment and is used to collect the internal pressure of the SF6 equipment. A cumulative mass flow meter 12 is installed in the gas filling pipeline and is used to collect the cumulative mass of the gas filled in. Temperature sensor 13 is installed inside the inflation pipeline and is used to collect ambient temperature.

[0037] Specifically, such as Figure 5 As shown, the sensing component constitutes the data sensing layer of the entire diagnostic system, and its carefully configured sensor array ensures the comprehensiveness and accuracy of parameter acquisition during the inflation process. This sensing component mainly includes the following parts: The reference pressure sensor 11 is directly mounted on the SF6 equipment body and connects to the equipment's gas chamber via its built-in pressure monitoring interface. It is used to directly acquire the absolute pressure inside the SF6 equipment. This value is used to calculate the pressure change inside the equipment. The direct data source is the basis for calculating the volume constant.

[0038] A cumulative mass flow meter 12 is connected in series on the inflation pipeline; in this embodiment, one of its core functions is to accurately measure and accumulate the cumulative mass of the gas injected from the start of inflation to any given moment. This cumulative mass of the gas injected is directly used as the mass change in the volume constant calculation formula. This is key quality audit data for diagnosing whether there are cavity defects inside the equipment; in this embodiment, a thermal mass flow meter is preferred.

[0039] Temperature sensor 13 is used to collect the ambient temperature during the inflation process. Since the calculation of the ideal gas law depends on absolute temperature, this temperature value is used to unify parameters such as pressure and mass under the same thermodynamic conditions, and is a necessary correction parameter to ensure the accuracy of the volume constant calculation.

[0040] In some embodiments, the control device 10 is further configured to: Generate based on real-time data collection of internal pressure in SF6 equipment; Based on time-series pressure data, the adsorption rate constant was calculated using a nonlinear least squares fitting exponential model. Compare the adsorption rate constant with the preset adsorption rate reference range; Determine whether the adsorption rate difference exceeds the preset adsorption rate benchmark range; If so, then the adsorbent inside the SF6 equipment is determined to be abnormal.

[0041] Specifically, the control device 10 is also configured to perform another critical diagnostic task: assessing the condition of the adsorbent inside the SF6 equipment and diagnosing faults. The specific process is as follows: The control device 10 first generates time-series pressure data (i.e., time-pressure sequence data) based on the real-time internal pressure of the SF6 equipment collected by the reference pressure sensor 11. Subsequently, the control device 10 uses a nonlinear least squares method to perform curve fitting on this time-series pressure data; the physical model used for fitting is an exponential function: ; in, This represents the internal pressure of the SF6 equipment at time t; The steady-state pressure value obtained through fitting represents the theoretical pressure that can be reached by inflation; K is the adsorption rate constant obtained through fitting. This parameter quantitatively characterizes the rate at which the pressure rises to the steady-state value, and its value directly reflects the adsorbent's ability to adsorb SF6 gas. After obtaining the adsorption rate constant through fitting, the control device 10 compares it with a preset adsorption rate benchmark range. The preset adsorption rate benchmark range is obtained by conducting multiple benchmark inflation tests after the SF6 equipment is newly put into operation or after the adsorbent is replaced (i.e., in a healthy state), statistically analyzing multiple benchmark values, and calculating their average value. and standard deviation The established reference range; in this embodiment, the preset adsorption rate reference range is... That is, when K is less than Or K is greater than If the adsorption rate constant exceeds the preset adsorption rate benchmark range, the adsorbent inside the SF6 equipment is determined to be in an abnormal state.

[0042] Specifically, if the adsorption rate constant is significantly greater than the upper limit of the reference range, it indicates that the pressure rises too quickly and the adsorbent's adsorption effect on the gas is weak. Based on this, it can be determined that the adsorbent is saturated or ineffective and its adsorption capacity has been severely reduced. If the adsorption rate constant is significantly less than the lower limit of the baseline range, it indicates that the pressure rise is too slow, which suggests that the adsorbent has abnormal over-adsorption or other potential problems.

[0043] In some implementations, the sensing component further includes: Mass flow meter 14 is installed in the inflation pipeline and is used to collect the instantaneous mass flow rate of the gas being filled in the inflation pipeline. Dynamic pressure sensor 15 is installed inside the inflation line and is used to collect the pressure of the inflation line. The control device 10 is also configured to: Correlation analysis based on instantaneous mass flow rate and inflation line pressure; Determine whether the instantaneous mass flow rate is consistently below the second threshold and whether the inflation line pressure is consistently above the third threshold; If so, the inflation line is considered blocked.

[0044] Specifically, the control device 10 is also configured to perform real-time monitoring and fault diagnosis of the inflation process itself; like Figure 5 As shown, the sensing component also includes: Mass flow meter 14, preferably a thermal mass flow meter, is connected in series in the inflation pipeline. One of its key functions is to collect the instantaneous mass flow rate of the inflation gas at high frequency, which reflects the inflation rate at the current moment.

[0045] Dynamic pressure sensor 15: This sensor is installed at the inlet of the inflation line and has a sampling rate of not less than 100Hz. It is used to collect the dynamic pressure of the inflation line at high frequency.

[0046] The control device 10 uses the two dynamic parameters mentioned above to perform real-time correlation analysis. Its core logic lies in monitoring the synergistic relationship that should exist between mass flow rate and pipeline pressure during normal inflation. When this relationship is broken and exhibits a specific abnormal pattern, a process fault can be diagnosed.

[0047] Specifically, the control device 10 is configured to continuously monitor the values ​​and trends of instantaneous mass flow rate and inflation line pressure.

[0048] When the control device 10 detects a specific abnormal pattern where "the instantaneous mass flow rate is continuously lower than the second threshold (i.e., its normal expected range, in this embodiment, the second threshold is 70% of the rated inflation flow rate of the inflation circuit), and the inflation line pressure is continuously higher than the third threshold (i.e., its normal expected range, in this embodiment, the third threshold is 110% of the target inflation pressure)", it determines that the inflation line is blocked.

[0049] The diagnostic principle is as follows: when a flow channel is blocked, fluid resistance increases sharply. In order to drive gas flow, the gas source side needs to provide higher pressure, resulting in an abnormal increase in the pressure of the gas filling line; at the same time, due to the reduction in the flow cross-section, the actual gas flow rate that can pass through the blockage point will be significantly reduced. This "high pressure, low flow" characteristic pattern is a typical sign of flow channel blockage.

[0050] This diagnostic function enables online monitoring of the health status of the inflation circuit, allowing for the early detection and alarm of pipeline blockages during inflation operations. It guides staff to promptly check joints, valves, or pipelines, effectively ensuring the smooth progress of inflation operations and the reliability of diagnostic results.

[0051] Example 2 Please refer to Figure 6 The present application provides a fault detection method based on an SF6 equipment inflation device provided in Embodiment 1, comprising the following steps: S1: Calculate the actual volume constant of the SF6 equipment based on the characteristic parameters; the characteristic parameters include at least: the internal pressure of the SF6 equipment, the cumulative mass of gas filled, and the ambient temperature; S2: Subtract the actual volume constant from the standard volume constant to obtain the volume constant difference value; S3: Determine whether the volume constant difference is greater than the first threshold; S4: If so, it is determined that there is a cavity defect inside the SF6 equipment.

[0052] Specifically, the method can be executed by the control device 10. For example, the control device 10 can preferably be a host computer, which can be an industrial computer, an embedded industrial control computer or a terminal device with data processing capabilities. It establishes a connection with the sensing components through a preset communication protocol, receives characteristic parameters such as the internal pressure of the SF6 equipment, the cumulative mass of the gas filled and the ambient temperature in real time, and stores the data locally or in an associated database for subsequent analysis and traceability. Specifically, the control device 10, based on the cumulative mass of gas injected, the change in SF6 equipment pressure, and characteristic parameters of ambient temperature, uses the formula... Calculate the actual volume constant C of the SF6 equipment; in, The change in the mass of the gas being filled is the cumulative mass of the gas being filled collected in this application. The change in internal pressure of the SF6 equipment is obtained by subtracting the initial pressure before inflation from the real-time measured internal pressure of the SF6 equipment; T is the collected ambient temperature; R is the gas constant of SF6 gas (approximately 56.2 J / (kg·K)).

[0053] After obtaining the actual volume constant C, the control device 10 subtracts the calculated actual volume constant C from the standard volume constant (usually provided by the equipment manufacturer) to obtain the volume constant difference value. This volume constant difference value is then compared with a first threshold (in this embodiment, the first threshold is 10% of the standard volume constant). If the volume constant difference value is greater than the first threshold, it is determined that a cavity defect exists inside the SF6 equipment. Such defects are typically caused by faults such as cracked insulation components or the formation of additional cavities due to the detachment of internal parts. This diagnostic method can sensitively detect minute changes in the internal structure of the equipment, thereby achieving non-destructive assessment and early warning of its mechanical integrity.

[0054] Furthermore, it also includes the following steps: S5: Generate time-series pressure data based on real-time acquisition results of internal pressure of SF6 equipment; S6: Based on time-series pressure data, the adsorption rate constant is calculated using a nonlinear least squares fitting exponential model. S7: Compare the adsorption rate constant with the preset adsorption rate reference range; S8: Determine whether the adsorption rate difference exceeds the preset adsorption rate benchmark range; S9: If so, then the adsorbent inside the SF6 equipment is determined to be abnormal.

[0055] Specifically, the control device 10 is also configured to perform another critical diagnostic task: assessing the condition of the adsorbent inside the SF6 equipment and diagnosing faults. The specific process is as follows: The control device 10 first generates time-series pressure data (i.e., time-pressure sequence data) based on the real-time internal pressure of the SF6 equipment collected by the reference pressure sensor 11. Subsequently, the control device 10 uses a nonlinear least squares method to perform curve fitting on this time-series pressure data; the physical model used for fitting is an exponential function: ; in, This represents the internal pressure of the SF6 equipment at time t; The steady-state pressure value obtained through fitting represents the theoretical pressure that can be reached by inflation; K is the adsorption rate constant obtained through fitting. This parameter quantitatively characterizes the rate at which the pressure rises to the steady-state value, and its value directly reflects the adsorbent's ability to adsorb SF6 gas. After obtaining the adsorption rate constant through fitting, the control device 10 compares it with a preset adsorption rate benchmark range. The preset adsorption rate benchmark range is obtained by conducting multiple benchmark inflation tests after the SF6 equipment is newly put into operation or after the adsorbent is replaced (i.e., in a healthy state), statistically analyzing multiple benchmark values, and calculating their average value. and standard deviation The established reference range; in this embodiment, the preset adsorption rate reference range is... That is, when K is less than Or K is greater than If the adsorption rate constant exceeds the preset adsorption rate benchmark range, the adsorbent inside the SF6 equipment is determined to be in an abnormal state.

[0056] Specifically, if the adsorption rate constant is significantly greater than the upper limit of the reference range, it indicates that the pressure rises too quickly and the adsorbent's adsorption effect on the gas is weak. Based on this, it can be determined that the adsorbent is saturated or ineffective and its adsorption capacity has been severely reduced. If the adsorption rate constant is significantly less than the lower limit of the baseline range, it indicates that the pressure rise is too slow, which suggests that the adsorbent has abnormal over-adsorption or other potential problems.

[0057] Furthermore, it also includes the following steps: S10: Correlation analysis based on instantaneous mass flow rate and inflation pipeline pressure; S11: Determine whether the instantaneous mass flow rate is continuously lower than the second threshold and whether the inflation line pressure is continuously higher than the third threshold. S12: If so, the inflation line is blocked.

[0058] Specifically, the control device 10 is configured to continuously monitor the instantaneous mass flow rate and the pressure of the inflation line, as well as their changing trends.

[0059] When the control device 10 detects a specific abnormal pattern where "the instantaneous mass flow rate is continuously lower than the second threshold (i.e., its normal expected range, in this embodiment, the second threshold is 70% of the rated inflation flow rate of the inflation circuit), and the inflation line pressure is continuously higher than the third threshold (i.e., its normal expected range, in this embodiment, the third threshold is 110% of the target inflation pressure)", it determines that the inflation line is blocked.

[0060] The diagnostic principle is as follows: when a flow channel is blocked, fluid resistance increases sharply. In order to drive gas flow, the gas source side needs to provide higher pressure, resulting in an abnormal increase in the pressure of the gas filling line; at the same time, due to the reduction in the flow cross-section, the actual gas flow rate that can pass through the blockage point will be significantly reduced. This "high pressure, low flow" characteristic pattern is a typical sign of flow channel blockage.

[0061] This diagnostic function enables online monitoring of the health status of the inflation circuit, allowing for the early detection and alarm of pipeline blockages during inflation operations. It guides staff to promptly check joints, valves, or pipelines, effectively ensuring the smooth progress of inflation operations and the reliability of diagnostic results.

[0062] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An inflation device for SF6 equipment, characterized in that, include: An inflation connector, one end of which is connected to the SF6 equipment and the other end of which is connected to the gas source; the inflation connector is used to establish an inflation pipeline between the gas source and the SF6 equipment; A sensing component is provided on the inflation pipeline and the SF6 equipment. The sensing component is used to collect characteristic parameters in real time during the inflation process. The characteristic parameters include at least: the internal pressure of the SF6 equipment, the cumulative mass of gas filled, and the ambient temperature. Control device (10), which is communicatively connected to the sensing component, is configured to: Based on the aforementioned characteristic parameters, the actual volume constant of the SF6 equipment is calculated; The difference between the actual volume constant and the standard volume constant is obtained as the volume constant difference value; Determine whether the difference in volume constants is greater than a first threshold; If so, it is determined that a cavity defect exists inside the SF6 equipment.

2. The inflation device for SF6 equipment according to claim 1, characterized in that, The inflation connector includes: a first connector (1) and a second connector (2). The first connector (1) has a first channel extending through it along its axial direction, and the second connector (2) has a second channel extending through it along its axial direction. One end of the first connector (1) is inserted into the second connector (2) so that the first channel and the second channel are connected to form the inflation pipeline. The end of the first connector (1) away from the second connector (2) is connected to the SF6 equipment, and the end of the second connector (2) away from the first connector (1) is connected to the air source. A check valve is provided in the second channel.

3. The inflation device for SF6 equipment according to claim 2, characterized in that, The first connector (1) and the second connector (2) are connected by a self-locking structure, the self-locking structure comprising: An annular groove (3) is circumferentially arranged around the outer wall of the first connector (1); The first through hole is circumferentially arranged on the second connector (2). A plurality of locking elements (16) are arranged in a ring inside the first through hole. The locking elements (16) can move radially along the second connector (2) inside the first through hole. Locking sleeve (4), the locking sleeve (4) is sleeved on the end of the second connector (2) that has the first through hole; the inner wall of the locking sleeve (4) is provided with a locking block (8). An elastic energy storage component is disposed between the locking sleeve (4) and the second connecting member (2), and the elastic energy storage component is used to provide the locking sleeve (4) with a driving force for moving along the axial direction of the second connecting member (2); When the first connector (1) is connected to the second connector (2), the locking sleeve (4) moves toward the first connector (1) under the drive of the elastic energy storage component, and the locking block (8) moves to correspond to the first through hole. At this time, the locking block (8) presses the locking element (16) radially into the annular groove (3) to achieve self-locking connection.

4. The inflation device for SF6 equipment according to claim 3, characterized in that, The elastic energy storage component includes: Elastic element (5), the elastic element (5) is disposed on the side of the locking block (8) away from the first connecting member (1), one end of the elastic element (5) is connected to the locking block (8), and the other end of the elastic element (5) is connected to the outer wall of the locking sleeve (4); A stop ring (6) is sleeved on the second connector (2) and located on the side of the first through hole close to the first connector (1); The limiting member (7) is sleeved on the inner wall of the locking sleeve (4) and is located on the side of the locking block (8) near the first connecting member (1). The limiting member (7) is used to abut against the stop ring (6) to restrict the locking sleeve (4) from moving toward the first connecting member (1).

5. An inflation device for SF6 equipment according to claim 1, characterized in that, The sensing component includes: A reference pressure sensor (11) is installed on the SF6 equipment and is used to collect the internal pressure of the SF6 equipment. A cumulative mass flow meter (12) is installed in the gas filling pipeline and is used to collect the cumulative mass of the gas being filled. Temperature sensor (13) is installed in the inflation pipeline and is used to collect the ambient temperature.

6. An inflation device for SF6 equipment according to claim 5, characterized in that, The control device (10) is also configured to: Based on the real-time acquisition results of the internal pressure of the SF6 equipment, time-series pressure data is generated; Based on the time-series pressure data, the adsorption rate constant was calculated using a nonlinear least squares fitting exponential model. Compare the adsorption rate constant with a preset adsorption rate reference range; Determine whether the adsorption rate difference exceeds the preset adsorption rate benchmark range; If so, the adsorbent inside the SF6 device is determined to be abnormal.

7. An inflation device for SF6 equipment according to claim 6, characterized in that, The sensing component also includes: Mass flow meter (14), the mass flow meter (14) is installed in the inflation pipeline, the mass flow meter (14) is used to collect the instantaneous mass flow rate of the gas filled in the inflation pipeline; A dynamic pressure sensor (15) is installed inside the inflation line and is used to collect the pressure of the inflation line. The control device (10) is also configured to: Based on the correlation analysis between the instantaneous mass flow rate and the pressure of the inflation pipeline; Determine whether the instantaneous mass flow rate is continuously lower than the second threshold and whether the inflation pipeline pressure is continuously higher than the third threshold; If so, the inflation line is determined to be blocked.

8. A fault detection method, based on the inflation device for SF6 equipment according to any one of claims 1-7, characterized in that, Includes the following steps: The actual volume constant of the SF6 equipment is calculated based on the characteristic parameters; The characteristic parameters include at least: the internal pressure of the SF6 equipment, the cumulative mass of gas filled, and the ambient temperature; The difference between the actual volume constant and the standard volume constant is obtained as the volume constant difference value; Determine whether the difference in volume constants is greater than a first threshold; If so, it is determined that a cavity defect exists inside the SF6 equipment.

9. A fault detection method according to claim 8, characterized in that, It also includes the following steps: Based on the real-time acquisition results of the internal pressure of the SF6 equipment, time-series pressure data is generated; Based on the time-series pressure data, the adsorption rate constant was calculated using a nonlinear least squares fitting exponential model. Compare the adsorption rate constant with a preset adsorption rate reference range; Determine whether the adsorption rate difference exceeds the preset adsorption rate benchmark range; If so, the adsorbent inside the SF6 device is determined to be abnormal.

10. A fault detection method according to claim 9, characterized in that, It also includes the following steps: Correlation analysis based on instantaneous mass flow rate and inflation line pressure; Determine whether the instantaneous mass flow rate is continuously lower than the second threshold and whether the inflation pipeline pressure is continuously higher than the third threshold; If so, the inflation line is determined to be blocked.

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