Method and system for measuring opening synchronism of double-fracture environment-friendly GIS (Gas Insulated Switchgear)

Abstract

The invention relates to the technical field of electrical engineering, in particular to a double-fracture environment-friendly GIS (gas insulated switchgear) opening synchronism measurement method and system, which can accurately and effectively evaluate the synchronism of two vacuum arc extinguish chambers in the opening process by monitoring and measuring voltage signals of the vacuum arc extinguish chambers in the GIS in real time. A second-class data set is obtained by processing voltage data, calculation and analysis are carried out, a result is finally output, and accurate synchronism judgment is provided for operation of a power system; compared with a traditional method, the measurement accuracy is improved, physical invasion to equipment is avoided, and the safety and reliability of the equipment are enhanced; through accurate analysis of synchronism data, potential equipment faults can be found and pre-warned in time, and the operation efficiency of the power system and the convenience of maintenance and management are improved. The technical problem of double-fracture environment-friendly GIS fracture synchronism measurement is solved, and an important guarantee is provided for efficient operation and safe maintenance of power equipment.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering technology, and in particular to a double-break environmental protection GIS opening synchronicity measurement method and system. Background Art

[0002] In high-voltage power distribution systems, the synchronization of vacuum interrupters is one of the key technical challenges, especially in environmentally friendly gas-insulated switchgear (GIS). These vacuum interrupters are usually sealed inside the environmentally friendly GIS. Due to their structural characteristics, traditional measurement methods are difficult to apply directly. Therefore, ensuring that the interrupters can be opened at the same time is the key to avoiding equipment overload and failure. Vacuum interrupters are usually connected in series, which can improve their breaking capacity. However, if the synchronicity of the interrupters in series is poor, a single interrupter may be subjected to huge breaking pressure, resulting in a breaking failure. This breaking failure not only affects the reliability of the system, but may also lead to a wider range of system failures.

[0003] In order to overcome the above challenges, this technology proposes a double-break environmental protection GIS opening synchronization measurement method and device, which monitors the voltage changes at both ends of each vacuum interrupter to evaluate its opening synchronization. This method can not only achieve an effective evaluation of the opening synchronization, but also because it uses non-invasive measurement technology, it does not require any physical changes to the GIS, thereby maintaining the integrity and sealing of the system.

[0004] In addition, since the vacuum interrupter in GIS cannot usually be directly connected to the lead wire from the outside, the present invention also specially designs a voltage measurement and acquisition device, which can accurately measure and analyze the voltage fluctuation, so as to indirectly judge the interruption condition of the interrupter. The innovation of this method is that it not only improves the accuracy and reliability of the measurement, but also greatly simplifies the operation process, making it easier for on-site technicians to carry out monitoring and maintenance work.

[0005] This advanced measurement technology and device can effectively solve the problem of synchronous measurement of vacuum interrupter in environmental protection GIS, ensure the efficient and safe operation of the system, and thus improve the reliability and stability of the entire power system. Summary of the invention

[0006] In view of the above problems existing in the prior art, the present invention is proposed.

[0007] Therefore, the technical problem to be solved by the present invention is that the two vacuum interrupters in the high-voltage environmental protection GIS are often arranged in series inside, and it is difficult to directly connect the leads between the two breaks. The synchronicity of the opening and closing of the two interrupters is an important problem faced by the diagnosis of the environmental protection GIS. Therefore, a method and device for measuring the synchronicity of the opening of a double-break environmental protection GIS is proposed, which solves the problem of measuring the synchronicity of the two vacuum interrupter breaks in the environmental protection GIS.

[0008] To solve the above technical problems, the present invention provides the following technical solutions, a method for measuring the synchronicity of a double-break environmental protection GIS switch opening, comprising: real-time monitoring and measurement to obtain a type of data; processing the data to obtain a type of data set; performing calculation and analysis on the processed data; and outputting results based on the analysis.

[0009] As a preferred solution of the double-break environmental protection GIS opening synchronization measurement method described in the present invention, the real-time monitoring and measurement includes real-time monitoring of the operating status of the system, obtaining relevant data information for analysis and processing.

[0010] As a preferred solution of the method for measuring the synchronicity of double-break environmental protection GIS opening gates described in the present invention, the data processing includes collating the data and extracting information for further evaluation after measuring and collecting the data.

[0011] As a preferred solution of the method for measuring the synchronicity of double-break environmental protection GIS opening of the present invention, the calculation includes further analyzing the processed data to support accurate judgment and decision-making.

[0012] As a preferred solution of the double-break environmental protection GIS opening synchronization measurement method described in the present invention, the output result includes converting the calculated information into a format to ensure effective presentation and provide reference decisions for users.

[0013] As a preferred solution of the double-break environmental protection GIS opening synchronicity measurement method described in the present invention, wherein: the first type of data includes voltage signals at both ends of the GIS obtained by a first type of method.

[0014] As a preferred solution of the double-break environmental protection GIS opening synchronization measurement method described in the present invention, the second type of data set includes importing a type of data into the software for processing and reading to obtain the data set.

[0015] Another object of the present invention is to provide a double-break environmental protection GIS trip synchronization measurement system, which can realize the efficient integration of real-time monitoring, data processing, calculation analysis and result output, improve measurement accuracy and decision support capabilities, and provide users with more reliable reference data.

[0016] In order to solve the above technical problems, the present invention provides the following technical solutions: a double-break environmental protection GIS switch-off synchronization measurement system, comprising: a data acquisition module, a data processing module, a calculation and analysis module and a result output module;

[0017] The data acquisition module monitors and measures in real time to obtain a type of data;

[0018] The data processing module processes the data to obtain two types of data sets;

[0019] The computing and analysis module performs computing and analysis on the processed data;

[0020] The result output module outputs the result according to the analysis.

[0021] A computer device includes a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the above-mentioned method for measuring the synchronicity of a double-break environmental protection GIS switch opening are implemented.

[0022] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the above-mentioned method for measuring the synchronicity of a double-break environmental protection GIS switch opening are implemented.

[0023] Beneficial effects of the present invention: Provides a method and device that can accurately and effectively measure and evaluate the synchronicity of the vacuum interrupter opening in high-voltage gas-insulated switchgear (GIS). By monitoring the voltage changes of the two vacuum interrupters during the opening process, the present invention not only improves the accuracy of the measurement, but also avoids physical intrusion into the equipment, thereby enhancing the safety and reliability of the equipment. In addition, the method can timely discover and warn of potential equipment failures through accurate analysis of the synchronicity data, greatly improving the operating efficiency of the power system and the convenience of maintenance management. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 A flow chart of a method for measuring the synchronicity of a double-break environmental protection GIS switch opening provided by one embodiment of the present invention.

[0026] Figure 2 A device diagram of a method for measuring the synchronicity of a double-break environmental protection GIS switch opening provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0028] Example 1, reference Figure 1 , is an embodiment of the present invention, which provides a method for measuring the synchronicity of a double-break environmental protection GIS switch opening, comprising:

[0029] S1: Real-time monitoring and measurement to obtain a type of data.

[0030] It should be noted that if Figure 1 As shown in S1, real-time monitoring and measurement include real-time monitoring of the operating status of the system, and obtaining relevant data information for analysis and processing.

[0031] Furthermore, the voltage probe is directly connected to the two ends of the GIS to be tested, wherein the high-voltage side of the voltage probe is connected to the high-voltage side of the LC current source, and the low-voltage side of the voltage probe is connected to the low-voltage side of the LC current source. The voltage measurement range of the digital-to-analog conversion module is set to 400V; the analog-to-digital conversion module is started to monitor the voltage signal at both ends of the GIS in real time; the host computer sends a control signal, the controllable period switch of the LC current source is turned on, the LC current source loop is connected and a small current flows through the GIS; the host computer sends a control signal, the GIS starts to open the gate, and the two arc extinguishing chambers are separated in turn; the arc extinguishing chamber that is opened first forms a vacuum arc, and an arc is also formed in the vacuum arc extinguishing chamber that is opened later.

[0032] Furthermore, the arc voltage data is recorded through the analog-to-digital conversion module; the stored voltage data is uploaded to the host computer through the network cable for data storage, and the storage format is a general format such as TXT.

[0033] In the embodiment of the present application, one type of data is the voltage signals at both ends of the GIS obtained by a type of method, and these signals are collected by voltage probes installed at both ends of the vacuum interrupter to be tested; the high-voltage side of the voltage probe is connected to the high-voltage side of the LC current source, and the low-voltage side is connected to the low-voltage side of the LC current source; through the analog-to-digital conversion module, these signals can ensure the accuracy within the measurement range when they are collected, and the setting range is 400V; after starting the analog-to-digital conversion module, the voltage signals at both ends of the GIS can be monitored in real time; then, the host computer sends a control signal to turn on the controllable period switch of the LC current source , forming a loop and allowing a small current to flow through the GIS; with the start of the GIS opening action, the two arc extinguishing chambers are separated in turn, and a vacuum arc is formed in the arc extinguishing chamber that is opened first, and an arc is also formed in the arc extinguishing chamber that is opened later; through this configuration, the arc voltage data can be recorded through the analog-to-digital conversion module when the voltage suddenly changes; finally, the stored voltage data is uploaded to the host computer through the network, and the data is stored in a general format such as TXT; this whole set of processes not only provides an effective technical means to monitor and evaluate the synchronicity of GIS opening, but also ensures the accuracy and real-time nature of data acquisition.

[0034] In an optional embodiment, a type of data can also be realized in other ways. In addition to collecting the voltage signal at both ends of the GIS through a voltage probe, electrical parameters can also be obtained through other sensors and monitoring equipment; for example, the current signal inside the GIS can be monitored by a current sensor, or the temperature change in the vacuum interrupter can be detected by a temperature sensor; these sensors can provide physical data related to the GIS opening action in real time, thereby supplementing or verifying the changing trend of the voltage signal; through the joint use of multiple sensors, the working status of the GIS equipment can be more comprehensively evaluated to ensure the multi-dimensionality and accuracy of the data; in addition, the system can normalize the data according to the different sensor types, so as to unify the data sources during analysis and eliminate unnecessary errors.

[0035] In an optional embodiment, a type of data can also be realized in other ways. In addition to voltage and current signals, data related to the synchronicity of the opening can also be indirectly obtained by other methods; for example, by using image processing technology, a high-definition camera or infrared camera installed inside the GIS can be used to capture the arc shape changes in the arc extinguishing chamber and the opening action of the arc extinguishing chamber; after analyzing these image data, the opening time of the arc extinguishing chamber and the arc generation time can be calculated, thereby indirectly calculating the synchronicity of the opening of the GIS equipment; the image data can not only provide additional reference for the electrical signal, but also help the operator to understand the status of the equipment more intuitively through visualization; in this case, the image data can be analyzed by a special image processing algorithm to finally obtain supplementary information about voltage, current, temperature, etc.; the advantage of this method is that it can provide richer intuitive data than traditional electrical signals, and is suitable for monitoring in environments that are difficult to directly contact or measure; by combining different types of data, the accuracy of the measurement and the reliability of the system can be further improved.

[0036] In the embodiment of the present application, one method is to install voltage probes at both ends of the GIS to be detected, and use an analog-to-digital conversion module to measure the voltage signals at both ends of the GIS in real time; the specific method is: first, the high-voltage side of the voltage probe is connected to the high-voltage side of the LC current source, and the low-voltage side is connected to the low-voltage side of the LC current source; the voltage probe is installed at both ends of the vacuum arc chamber and as close to the arc chamber as possible to ensure that the collected voltage signal can accurately reflect the actual situation of the voltage change during the opening process; to ensure the accuracy of the measurement, the voltage measurement range of the analog-to-digital conversion module is set to 400V; after starting the analog-to-digital conversion module, the module can monitor the voltage signals at both ends of the GIS in real time; at this time, the host computer sends a control signal to start the controllable period switch of the LC current source, so that the LC current source loop is connected and a small current flows through the GIS; as the host computer continues to send control signals, the GIS starts to perform the opening operation, and the two arc chambers are separated in turn; first, the opened arc chamber forms a vacuum arc, and then an arc is also formed in the other opened arc chamber;

[0037] During this process, the analog-to-digital conversion module will record the arc voltage data in real time and upload the recorded data to the host computer through the network to ensure the real-time and integrity of the data; the uploaded data is stored in a general format such as TXT for subsequent processing and analysis; this method can effectively monitor and record the voltage changes that occur during the GIS opening process, and provide reliable original data support for subsequent analysis through precise data acquisition; through real-time monitoring of voltage signals, it can ensure the normal opening operation of GIS equipment, and provide an important basis for evaluating the synchronicity of the opening; therefore, this type of method is a key technical means for obtaining voltage signals at both ends of GIS, which ensures the accuracy and real-time nature of data acquisition.

[0038] In an optional embodiment, a type of method can also be implemented in other ways. In addition to collecting voltage signals through voltage probes and analog-to-digital conversion modules, wireless sensor networks can also be used to realize real-time data collection and transmission; in this method, multiple wireless sensors can be installed at key parts of GIS equipment. These sensors can monitor multiple parameters such as voltage, current, temperature, etc. in real time, and send data to the central processing unit through wireless communication.

[0039] In an optional embodiment, a class of methods can also be implemented in other ways. In addition to using voltage probes and sensors, indirect monitoring can also be performed by utilizing electrical simulation models; by establishing an electrical simulation model of GIS equipment in a computer, the voltage and current changes inside the equipment under different working conditions can be simulated; this simulation method does not require the actual installation of voltage probes, but obtains relevant data through mathematical models and simulation calculations.

[0040] Example 2, reference Figure 1 , is an embodiment of the present invention, which provides a method for measuring the synchronicity of a double-break environmental protection GIS switch opening, comprising:

[0041] S2: Process the data to obtain the second category data set.

[0042] It should be noted that if Figure 1 As shown in S2, processing data includes organizing the data and extracting information for further evaluation after measuring and collecting the data.

[0043] Furthermore, the voltage data is imported into MATLAB software through the load command; the imported data is smoothed using a multi-point averaging method, which is implemented in MATLAB through the smoothdata command; then, the first voltage mutation time T1 is read; the second voltage mutation time T2 is read; and the obtained data sets T1, T2 are stored.

[0044] Furthermore, the second type of data set includes importing the first type of data into the software for processing and reading the data set; specifically, after the voltage data is imported into the MATLAB software through the load command, the data is preliminarily sorted to ensure the accuracy of the data; then, the smoothdata command in MATLAB is used to smooth the data, and the multi-point averaging method is used to improve the stability and reliability of the data; next, the time point of the first mutation in the voltage signal is read; then, the time point of the second mutation in the voltage signal is read; these two key time points can be used to subsequently calculate the synchronization of the opening of the two vacuum interrupters; finally, the processed data set is stored for subsequent calculation analysis and result output.

[0045] S3: Perform computational analysis on the processed data.

[0046] It should be noted that if Figure 1 As shown in S3, performing calculations includes further analyzing the processed data to support accurate judgment and decision making.

[0047] Furthermore, the synchronicity of the opening of the two arc extinguishing chambers is calculated by programming in MATLAB, T=T2-T1.

[0048] Furthermore, the computer is programmed to perform subtraction directly, specifically T=T2-T1.

[0049] S4: Output the results based on the analysis.

[0050] It should be noted that if Figure 1 As shown in S4, the output results include converting the calculated information into a format to ensure effective presentation and provide reference decisions for users.

[0051] Furthermore, repeat S1 to S3 for a total of 3 times, and obtain the synchronicity of the three breaking processes, which are recorded as TA, TB, and TC respectively; program in MATLAB to calculate the average value of the three breaking synchronicities TAVE=(TA+TB+TC) / 3.

[0052] Furthermore, TAVE is compared with a reference value (temporarily taken as 2ms). If it is greater than the reference value, a warning result is output; if it is less than the reference value, a qualified result is output.

[0053] Example 3, reference Figure 2 , is an embodiment of the present invention, which provides a method for measuring the synchronicity of a double-break environmental protection GIS switch opening, comprising:

[0054] A measuring device for measuring the synchronicity of double-break environmental protection GIS opening is given. Figure 2 As shown:

[0055] The vacuum degree early warning device for a vacuum circuit breaker comprises three parts: a vacuum interrupter to be tested (1), a voltage measurement and acquisition device (2), and a host computer (3).

[0056] The voltage measurement and acquisition device (2) includes a voltage probe and an analog-to-digital conversion module. The voltage measurement and acquisition device (2) is installed at both ends of the vacuum interrupter (1) to be measured and as close to the vacuum interrupter as possible. At the same time, the voltage probe should be installed firmly, including but not limited to bolts, to avoid signal interference caused by vibration.

[0057] The vacuum interrupter (1) to be tested is connected to a voltage measurement and acquisition device (2), wherein the voltage acquisition device is respectively connected to the incoming and outgoing lines of the GIS, that is, the two sides of the two vacuum interrupters (1) in the figure.

[0058] The specific steps are as follows:

[0059] Connecting a voltage measurement and collection device (2) to both sides of the GIS incoming and outgoing terminals;

[0060] The GIS is connected to a current source. The current source may be an LC current source, including an LC current loop 4, a controllable device switch 5, etc. The LC current source is pre-charged with a certain voltage, and the controllable device switch starts to maintain an off state.

[0061] Close the three-position switch of GIS to ensure that a circuit is formed between the device and the vacuum interrupter.

[0062] The host computer sends a control signal, the controllable period switch of the LC current source is turned on, the LC current source loop is connected and a small current flows through the GIS.

[0063] The host computer continues to send control signals, and the GIS starts to open the circuit breaker, and the two arc extinguishing chambers are separated in sequence. A vacuum arc is formed in the arc extinguishing chamber that opens first, and an arc is also formed in the vacuum arc extinguishing chamber that opens later.

[0064] The above is a schematic scheme of a method for measuring the synchronicity of a double-break environmental protection GIS opening in this embodiment. It should be noted that the technical scheme of the system of the method for measuring the synchronicity of a double-break environmental protection GIS opening is the same as the technical scheme of the above-mentioned method for measuring the synchronicity of a double-break environmental protection GIS opening. The details not described in detail in the technical scheme of the system for measuring the synchronicity of a double-break environmental protection GIS opening in this embodiment can be referred to the description of the technical scheme of the above-mentioned method for measuring the synchronicity of a double-break environmental protection GIS opening.

[0065] Embodiment 4 is an embodiment of the present invention, which provides a double-break environmental protection GIS opening synchronization measurement system, including: a data acquisition module, a data processing module, a calculation and analysis module and a result output module;

[0066] The data acquisition module monitors and measures in real time to obtain a type of data;

[0067] The data processing module processes the data to obtain two types of data sets;

[0068] The computing and analysis module performs computing and analysis on the processed data;

[0069] The result output module outputs the result according to the analysis.

[0070] This embodiment also provides a computing device, which is applicable to a method for measuring the synchronicity of a double-break environmental protection GIS opening, and includes:

[0071] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement a double-break environmental protection GIS opening synchronization measurement method as proposed in the above embodiment.

[0072] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, a method for measuring the synchronicity of a double-break environmental protection GIS switch opening is implemented as proposed in the above embodiment.

[0073] The storage medium proposed in this embodiment and the double-break environmental protection GIS opening synchronization measurement method proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0074] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0075] Logic and / or steps otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch instructions from and execute instructions on, an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0076] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for measuring the synchronicity of a double-break environmental protection GIS switch opening, characterized in that: include: Real-time monitoring and measurement to obtain a type of data; Process the data to obtain two types of data sets; Perform computational analysis on the processed data; Based on the analysis, output the results.

2. A method for measuring the synchronicity of a double-break environmental protection GIS switch opening as claimed in claim 1, characterized in that: The real-time monitoring and measurement includes real-time monitoring of the operating status of the system and obtaining relevant data information for analysis and processing.

3. A method for measuring the synchronicity of a double-break environmental protection GIS switch opening as claimed in claim 2, characterized in that: Processing data includes organizing the data and extracting information for further evaluation after measuring and collecting the data.

4. A method for measuring the synchronicity of a double-break environmental protection GIS opening as claimed in claim 3, characterized in that: The calculation includes further analyzing the processed data to support accurate judgment and decision-making.

5. A method for measuring the synchronicity of a double-break environmental protection GIS opening as claimed in claim 4, characterized in that: The output results include converting the calculated information into a format to ensure effective presentation and provide reference for decision-making by users.

6. A method for measuring the synchronicity of a double-break environmental protection GIS switch opening as claimed in claim 5, characterized in that: The first type of data includes voltage signals at both ends of the GIS obtained by a first type of method.

7. A method for measuring the synchronicity of a double-break environmental protection GIS switch opening as claimed in claim 6, characterized in that: The second type of data set includes importing the first type of data into the software for processing, and reading to obtain the data set.

8. A system for measuring the synchronicity of a double-break environmental protection GIS opening according to any one of claims 1 to 7, characterized in that: include: Data acquisition module, data processing module, calculation and analysis module and result output module; The data acquisition module monitors and measures in real time to obtain a type of data; The data processing module processes the data to obtain two types of data sets; The computing and analysis module performs computing and analysis on the processed data; The result output module outputs the result according to the analysis.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of a double-break environmental protection GIS opening synchronicity measurement method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a double-break environmental protection GIS opening synchronicity measurement method described in any one of claims 1 to 7 are implemented.

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