SF6 density meter self-checking device and method and self-checking SF6 density meter

Abstract

The invention relates to an SF6 density meter self-checking device and method and a self-checking SF6 density meter, the self-checking device comprises a calibration unit and a control unit, the calibration unit comprises a calibration communication valve, a reference pressure source and a density sensor, the reference pressure source, the density sensor and the calibration communication valve are sequentially connected with the SF6 density meter to be checked, and the density sensor is connected with the calibration communication valve. The calibrated SF6 density meter is connected with the electrical equipment through the main communication valve, the control unit is respectively connected with the calibration communication valve, the main communication valve, the density sensor and the calibrated SF6 density meter, the calibration unit is used for providing a calibration reference standard, and the calibration unit is connected with the calibration communication valve. And the control unit is used for realizing a calibration process of the calibrated SF6 density meter based on a calibration instruction and the calibration reference standard. Compared with the prior art, the method has the advantages that self-checking can be carried out without disassembly, and the downtime of equipment is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of SF6 gas density monitoring in the field of electric power equipment, and in particular relates to a self-calibration device and method for an SF6 density meter and a self-calibration SF6 density meter. Background Art

[0002] A large number of digital meters are used in substation equipment, which brings convenience but also brings some problems, such as digital meter security, reliability, data management and other issues. Among them, the reliability of digital meters is more prominent. The reliability of digital meters mainly includes the following aspects: Data collection accuracy: The data collection accuracy of digital meters is affected by many factors, such as grid voltage, current, frequency and other factors, which may cause inaccurate data collection of digital meters. Information transmission reliability: The information transmission reliability of digital meters is also affected by many factors, such as communication networks, communication protocols and other factors, which may cause unreliable information transmission of digital meters. Adaptability to harsh environments: The adaptability of digital meters in harsh environments is also a problem. For example, high temperature, low temperature, humidity and other environments may affect the normal operation of digital meters. On-site operation stability: The stability of digital meters during on-site operation is also a problem. Factors such as grid load changes and grid failures may affect the stable operation of digital meters. Therefore, it is necessary to ensure the normal and reliable operation of digital meter equipment through verification and calibration. Traditional laboratory verification cannot be performed online and takes a long time, which cannot meet the verification needs of digital meters that are operated for a long time on site. Therefore, it is necessary to study the data credibility assessment method for substation digital meters, which is also of great significance to ensure the accuracy and reliability of the basic status data of substation equipment.

[0003] SF6 is an important meter for monitoring the operating status of substation GIS equipment. Due to its excellent insulation properties and extremely low electrical breakdown rate, it is widely used as electrical insulation and arc extinguishing medium for high-voltage transmission equipment. Therefore, it is crucial to ensure the accuracy and reliability of the SF6 density meter. Traditional calibration methods generally require the disassembly of the SF6 density meter, resulting in long-term equipment downtime, which not only increases maintenance costs, but also affects the safety and reliability of power facilities. In order to meet this challenge, it is necessary to develop the calibration technology of the SF6 density meter. Summary of the invention

[0004] The purpose of the present invention is to provide a SF6 density meter self-calibration device, method and self-calibration SF6 density meter that improve the maintenance efficiency and operation stability of the density meter, and can perform self-checking and calibration without disassembly.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A SF6 density meter self-calibration device comprises a calibration unit and a control unit, wherein the calibration unit comprises a calibration intercommunication valve, a reference pressure source and a density sensor, wherein the reference pressure source, the density sensor, the calibration intercommunication valve and the calibrated SF6 density meter are connected in sequence, wherein the calibrated SF6 density meter is connected to an electrical device via a main intercommunication valve, and wherein the control unit is respectively connected to the calibration intercommunication valve, the main intercommunication valve, the density sensor and the calibrated SF6 density meter, wherein:

[0007] The calibration unit is used to provide a calibration reference standard, and the control unit implements a calibration process for the calibrated SF6 density meter based on the calibration instruction and the calibration reference standard.

[0008] Furthermore, the reference pressure source is a gas inlet interface connected to an external miniature SF6 gas bottle.

[0009] Furthermore, the reference pressure source is connected to a pressure regulator.

[0010] Furthermore, the control unit remotely communicates with a central monitoring system.

[0011] The present invention also provides a self-calibration method using the above-mentioned SF6 density meter self-calibration device, comprising the following steps:

[0012] The control unit receives a calibration instruction, controls the main connecting valve to close based on the calibration instruction, and controls the calibration connecting valve to open, so as to realize the connection between the calibration unit and the calibrated SF6 density meter;

[0013] The reference pressure source provides SF6 gas, and the control unit obtains the actual measurement value of the calibrated SF6 density meter and the sensing value of the density sensor, and determines whether the deviation value between the actual measurement value and the sensing value is greater than the set value, and generates a deviation adjustment signal when it is greater than the set value;

[0014] The control unit determines whether there are multiple consecutive deviation values ​​that are less than or equal to the set value. If so, the calibration is completed;

[0015] The control unit controls the calibration communication valve to be closed, and controls the main communication valve to be opened.

[0016] Before receiving the calibration instruction, it is determined whether the components of the SF6 density meter self-calibration device can operate normally.

[0017] Furthermore, the method further comprises:

[0018] The control unit records the calibration data and uploads it to the central monitoring system.

[0019] Furthermore, the calibration data includes actual measurement values ​​and sensor values ​​of each time and calibration completion time.

[0020] Furthermore, the method further comprises:

[0021] During the calibration process, get real-time gas leakage information.

[0022] The present invention also provides a self-checking SF6 density meter, comprising the SF6 density meter self-checking device as described above.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention can realize the self-calibration function of the SF6 density meter through the setting of the calibration unit and the automatic process of the control unit, so that the operator can conveniently perform regular calibration, thereby ensuring the stability and accuracy of the SF6 density meter during long-term operation; by optimizing the maintenance process of the SF6 density meter, the downtime of the equipment can be reduced, the operating reliability of the equipment can be improved, and a good guarantee can be provided for the long-term safe operation of the power equipment.

[0025] 2. The self-calibration device of the present invention can be built into the SF6 density meter to realize the self-calibration function of the SF6 density meter without disassembling the equipment. Under the premise of ensuring the integrity of the system, it ensures the safe and stable operation of the power equipment, which not only improves the maintenance efficiency and reliability of the SF6 density meter, but also provides a solid guarantee for the long-term safe operation of the power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the self-checking device of the present invention;

[0027] Figure 2 Flow chart of the self-checking method of the present invention. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0029] Example 1

[0030] This embodiment provides a SF6 density meter self-calibration device, which performs self-calibration on a main gas density meter 1 used for real-time monitoring of the density of SF6 gas to ensure the accuracy of its data, that is, the main gas density meter 1 is used as the calibrated SF6 density meter.

[0031] like Figure 1As shown, the self-calibration device includes a calibration unit 2 and a control unit 3. The calibration unit 2 includes a calibration connecting valve 23, a reference pressure source 21 and a density sensor 22. The reference pressure source 21, the density sensor 22, the calibration connecting valve 23 and the main gas density meter 1 are connected in sequence. The main gas density meter 1 is connected to the electrical equipment 5 through the main connecting valve 4. The control unit 3 is respectively connected to the calibration connecting valve 23, the main connecting valve 4, the density sensor 22 and the main gas density meter 1. The calibration unit 2 is used to provide a calibration reference standard. The control unit 3 implements the calibration process of the main gas density meter 1 based on the calibration instruction and the calibration reference standard.

[0032] In this embodiment, the reference pressure source 21 is a gas inlet interface connected to an external miniature SF6 gas bottle, which provides SF6 gas during the calibration process.

[0033] In a preferred embodiment, the reference pressure source 21 is also connected to a pressure regulator to adjust the pressure of the input SF6 gas to ensure the smooth execution of the calibration process.

[0034] In this embodiment, the density sensor adopts a commercially available high-precision density sensor, and the specific sensor type adopted is determined by considering the following factors:

[0035] Measurement accuracy: Select the appropriate accuracy level according to specific measurement requirements;

[0036] Measuring range: Make sure the measuring range of the selected sensor covers the actual measurement requirements;

[0037] Environmental adaptability: Consider the working environment of the sensor, such as temperature, pressure, humidity and other factors, and choose a sensor that can adapt to these environments;

[0038] Integration and ease of use: Consider the integration and ease of use of the sensor to ensure that it can be easily integrated into existing systems and is easy to operate and maintain.

[0039] In a preferred embodiment, the control unit 3 communicates remotely with the central monitoring system to achieve data recording and uploading of calibration results for subsequent data review and abnormality detection.

[0040] Through the combination of the above structures, the self-checking and real-time calibration of the SF6 density meter can be completed without affecting the operation of the power equipment.

[0041] Example 2

[0042] This embodiment provides a SF6 density meter self-calibration method, which is implemented based on the SF6 density meter self-calibration device as described in Example 1. Figure 2 As shown, the following steps are included:

[0043] S1. Start self-calibration, and the control unit receives the calibration instruction.

[0044] S2. The control unit 3 controls the main connecting valve 4 to close based on the calibration instruction, thereby cutting off the connection between the calibrated SF6 density meter and the power equipment 5.

[0045] S3. The control unit 3 controls the calibration connecting valve 23 to open, so as to connect the calibration unit 2 with the calibrated SF6 density meter, and ensure that the main gas density meter can be exposed to the calibration gas.

[0046] S4. The reference pressure source 21 provides SF6 gas, and the density sensor 22 measures and records the density of the gas in real time.

[0047] S5. The control unit 3 obtains the actual measurement value of the calibrated SF6 density meter and the sensing value of the density sensor, and determines whether the deviation between the actual measurement value and the sensing value is greater than the set value. When it is greater than the set value, a deviation adjustment signal is generated to facilitate the adjustment of the reading of the main gas density meter 1.

[0048] S6, the control unit 3 determines whether there are multiple consecutive deviation values ​​less than or equal to the set value, if so, the calibration is completed. The control unit performs multiple measurements to ensure the accuracy and repeatability of the calibration results, and accumulates data to verify the robustness of the results.

[0049] S7, the control unit 3 resets the valve, that is, controls the calibration connecting valve 23 to close, and controls the main connecting valve 4 to open, to ensure that the main gas density meter is smoothly restored to the connection with the power equipment.

[0050] Once calibration is complete, the control unit will confirm that the master gas density meter has been reconnected to the power supply and is in normal operation.

[0051] In a preferred embodiment, before starting the formal self-calibration, it is necessary to ensure that the SF6 density meter and the calibration device are correctly installed and preliminarily tested. At the same time, the control unit needs to be programmed and in a ready state, waiting to execute the calibration sequence.

[0052] In a preferred embodiment, the control unit records the calibration data, including each actual measurement value and sensor value and calibration completion time, and uploads it to the central monitoring system for subsequent data review and abnormality detection, and provides reference information for the next calibration.

[0053] The data stored and uploaded by the control unit include maintenance logs, which can record the specific information of each calibration, including date, time, calibration results and possible abnormal conditions, to ensure that all data of equipment operation can be checked. Based on the stored data, predictive maintenance can also be achieved. Specifically: based on the collected calibration data and historical trends, the next maintenance or calibration time is predicted and prompted to keep the equipment in the best operating state.

[0054] In a preferred embodiment, the following safety measures are implemented throughout the calibration process to ensure the safety of operators and equipment:

[0055] (1) Leak detection: During the calibration process, the gas leakage of the connecting valve and the calibration device is continuously monitored to ensure the sealing and safety of the entire process.

[0056] (2) Emergency shutdown: If an abnormal situation occurs, the system will automatically cut off all gas flow to prevent danger caused by gas leakage.

[0057] (3) User interface: Provides an intuitive and easy-to-understand operation interface designed to enable operators to monitor the calibration status in real time and allow manual intervention when necessary.

[0058] Example 3

[0059] This embodiment provides a self-checking SF6 density meter, including the SF6 density meter self-checking device as described in Example 1.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A SF6 density meter self-calibration device, characterized in that: It includes a calibration unit and a control unit, wherein the calibration unit includes a calibration intercommunication valve, a reference pressure source and a density sensor, wherein the reference pressure source, the density sensor, the calibration intercommunication valve and the calibrated SF6 density meter are connected in sequence, wherein the calibrated SF6 density meter is connected to the electrical equipment through the main intercommunication valve, and the control unit is respectively connected to the calibration intercommunication valve, the main intercommunication valve, the density sensor and the calibrated SF6 density meter, wherein: The calibration unit is used to provide a calibration reference standard, and the control unit implements a calibration process for the calibrated SF6 density meter based on the calibration instruction and the calibration reference standard.

2. The SF6 density meter self-calibration device according to claim 1 is characterized in that: The reference pressure source is a gas inlet interface connected to an external miniature SF6 gas bottle.

3. The SF6 density meter self-calibration device according to claim 1 is characterized in that: The reference pressure source is connected to a pressure regulator.

4. The SF6 density meter self-calibration device according to claim 1, characterized in that: The control unit is in remote communication with a central monitoring system.

5. A self-calibration method using the SF6 density meter self-calibration device according to any one of claims 1 to 4, characterized in that: The following steps are involved: The control unit receives a calibration instruction, controls the main connecting valve to close based on the calibration instruction, and controls the calibration connecting valve to open, so as to realize the connection between the calibration unit and the calibrated SF6 density meter; The reference pressure source provides SF6 gas, and the control unit obtains the actual measurement value of the calibrated SF6 density meter and the sensing value of the density sensor, and determines whether the deviation value between the actual measurement value and the sensing value is greater than the set value, and generates a deviation adjustment signal when it is greater than the set value; The control unit determines whether there are multiple consecutive deviation values ​​that are less than or equal to the set value. If so, the calibration is completed; The control unit controls the calibration communication valve to be closed, and controls the main communication valve to be opened.

6. The self-checking method according to claim 5, characterized in that: Before receiving the calibration instruction, it is determined whether the components of the SF6 density meter self-calibration device can operate normally.

7. The self-checking method according to claim 5, characterized in that: The method further includes: The control unit records the calibration data and uploads it to the central monitoring system.

8. The self-checking method according to claim 7, characterized in that: The calibration data includes actual measurement values ​​and sensor values ​​of each time and the calibration completion time.

9. The self-checking method according to claim 5, characterized in that: The method further includes: During the calibration process, get real-time gas leakage information.

10. A self-checking SF6 density meter, characterized in that: It comprises a SF6 density meter self-calibration device as described in any one of claims 1-3.

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