Method for detecting cooling performance of gas to axial electric arc and related device

Abstract

The invention discloses a method for detecting the cooling performance of gas to an axial arc and a related device, and relates to the technical field of electrics. Under the action of each to-be-detected gas medium, the circuit breakers with the same operation parameters are controlled to be switched on and off in the preset arcing interval corresponding to the to-be-detected gas medium, and arcing information corresponding to switching on and switching off is obtained; taking an intersection of the actual arcing durations corresponding to all the gas media to be detected as a common arcing interval; determining a characteristic time constant corresponding to each to-be-detected gas medium according to arc resistance characteristics reflected by the voltage signal and the current signal between the fractures of the circuit breaker in the common arcing interval corresponding to each to-be-detected gas medium; and comparing the characteristic time constants corresponding to the to-be-tested gas media to determine the cooling performance difference of the axial arc between the to-be-tested gas media, thereby providing a reference basis for circuit breaker design and gas type selection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electricity, in particular to a method for detecting the cooling performance of a gas on an axial arc and a related device. BACKGROUND

[0002] An arc is a high-temperature, high-conductivity plasma, and its essence is the process of breaking the current of a circuit breaker. The gap between the contacts is subjected to dielectric breakdown under a strong electric field, accompanied by the formation and energy release of high-temperature plasma. The continuous combustion of the arc can cause problems such as aging and degradation of the insulation material of the circuit breaker and a decrease in the breaking capacity of the circuit breaker. Therefore, effective control and rapid extinction of the arc are key factors in ensuring the safe operation of the circuit breaker and improving the reliability of the equipment and the stability of the power system.

[0003] In order to enhance the extinction ability of the arc, different gas media are widely used for cooling in engineering, such as air, nitrogen, sulfur hexafluoride (SF6), and mixed gas. These gases cool the high-temperature plasma in the arc channel through heat transfer, convection, diffusion, and other mechanisms, thereby reducing the arc temperature and conductivity and promoting the extinction of the arc.

[0004] However, the thermal physical properties of different gases differ greatly, and their cooling abilities for the arc differ significantly. Therefore, how to detect the cooling ability of different gases for the axial arc under high-speed airflow has become a technical problem that needs to be solved in the process of circuit breaker design and gas selection. SUMMARY

[0005] In view of the above problems, the present application provides a method for detecting the cooling performance of a gas on an axial arc and a related device to achieve the purpose of detecting the cooling ability of different gases for the axial arc under high-speed airflow. The specific scheme is as follows:

[0006] The first aspect of the present application provides a method for detecting the cooling performance of a gas on an axial arc, comprising:

[0007] Under the action of each to-be-detected gas medium, a circuit breaker with the same operating parameters is controlled to break in a preset arc interval corresponding to the to-be-detected gas medium, and arc information corresponding to the breaking is obtained. The arc information at least includes: an actual arc duration, and a voltage signal and a current signal between the breaking points of the circuit breaker within the actual arc duration; and the preset arc interval is an arc duration interval in which the arc of the circuit breaker remains axial.

[0008] The intersection of the actual arc durations corresponding to all the to-be-detected gas media is taken as a common arc interval.

[0009] determine a characteristic time constant corresponding to each of the to-be-tested gas media according to the arc resistance characteristics reflected by the voltage signals and the current signals between the breaking points of the circuit breaker in the common arcing interval corresponding to each of the to-be-tested gas media, the characteristic time constant representing a time required for the arc resistance value to change by the same multiple;

[0010] determine the differences in the cooling performance of the axial arc among the to-be-tested gas media by comparing the characteristic time constants corresponding to each of the to-be-tested gas media.

[0011] In a possible implementation, the determining of the characteristic time constant corresponding to each of the to-be-tested gas media according to the arc resistance characteristics reflected by the voltage signals and the current signals between the breaking points of the circuit breaker in the common arcing interval corresponding to each of the to-be-tested gas media includes:

[0012] determine the arc resistance values corresponding to a preset number of collection time points in the common arcing interval corresponding to each of the to-be-tested gas media according to the voltage signals and the current signals between the breaking points in the common arcing interval in the arcing information corresponding to the breaking acquired under each of the to-be-tested gas media;

[0013] fit, based on the arc resistance values corresponding to the preset number of collection time points in the common arcing interval, an arc resistance curve function corresponding to each of the to-be-tested gas media in the common arcing interval of the breaking process;

[0014] determine, based on the arc resistance curve function corresponding to each of the to-be-tested gas media, a characteristic time constant of the breaking process corresponding to each of the to-be-tested gas media.

[0015] In a possible implementation, the preset arcing interval is defined by the shortest arcing duration of the breaking of the circuit breaker and a preset time period after the shortest arcing duration.

[0016] In a possible implementation, the breaking of the circuit breaker controlled by the same operating parameter in the preset arcing interval corresponding to each of the to-be-tested gas media includes:

[0017] determining at least one arcing time point in the preset arcing interval;

[0018] controlling the circuit breaker with the same operating parameter to break at each of the arcing time points.

[0019] In a possible implementation, the breaking is a preset number of breakings, each of the to-be-tested gas media corresponds to arcing information corresponding to each breaking, and a characteristic time constant corresponding to each breaking process is determined according to the arcing information corresponding to each of the breakings.

[0020] The comparison of the characteristic time constant corresponding to each of the to-be-tested gas media determines the difference in the cooling performance of the axial arc between the to-be-tested gas media, including:

[0021] The characteristic time constant corresponding to each of the breaking processes of each of the to-be-tested gas media is counted to obtain a statistical value corresponding to each of the to-be-tested gas media;

[0022] The statistical value corresponding to each of the to-be-tested gas media is compared to determine the difference in the cooling performance of the axial arc between the to-be-tested gas media.

[0023] In a possible implementation, the determination of the operating parameter of the circuit breaker includes:

[0024] According to the arc temperature corresponding to the current generated in the breaking process, the current satisfying a preset condition is determined as the operating parameter, and the preset condition is that the arc temperature does not cause the phenomenon of metal droplets and vaporization on the contact surface.

[0025] The second aspect of the present application provides a system for detecting the cooling performance of a gas on an axial arc, including: an arc-extinguishing chamber, an arc burning information acquisition module, and a data processing unit;

[0026] The arc-extinguishing chamber includes a circuit breaker and a pre-charged to-be-tested gas medium;

[0027] The arc burning information acquisition module is configured to acquire arc burning information of the circuit breaker in each breaking process in the arc-extinguishing chamber;

[0028] The data processing unit is configured to implement the method for detecting the cooling performance of a gas on an axial arc in the first aspect or any implementation manner of the first aspect.

[0029] The third aspect of the present application provides a computer program product, including computer readable instructions, when the computer readable instructions run on an electronic device, the electronic device implements the method for detecting the cooling performance of a gas on an axial arc in the first aspect or any implementation manner of the first aspect.

[0030] The fourth aspect of the present application provides an electronic device, including at least one processor and a memory connected with the processor, wherein:

[0031] The memory is configured to store a computer program;

[0032] The processor is configured to execute the computer program, so that the electronic device can implement the method for detecting the cooling performance of a gas on an axial arc in the first aspect or any implementation manner of the first aspect.

[0033] The fifth aspect of the present application provides a computer storage medium, the storage medium carries one or more computer programs, when the one or more computer programs are executed by an electronic device, the electronic device can execute the method for detecting the cooling performance of the gas on the axial arc in the first aspect or any implementation manner of the first aspect.

[0034] By the above technical solution, the method for detecting the cooling performance of the gas on the axial arc provided by the present application controls the opening of the circuit breaker in each preset arc interval corresponding to the to-be-detected gas medium, so that the arc formed in the opening process of the circuit breaker is kept in an axial form. In this way, the arc information capable of representing the characteristics of the axial arc under the action of each to-be-detected gas medium is obtained. Further, based on the actual arc duration corresponding to all to-be-detected gas media, a common arc interval is selected, and the influence of the inconsistent arc evolution stages in the comparison of different experimental results on the results is reduced or eliminated, so that the cooling performance of different to-be-detected gas media on the arc is taken as the only variable affecting the arc extinction. Based on this, the arc resistance characteristics are extracted according to the voltage and current signals measured under the action of each to-be-detected gas medium, and a characteristic time constant is quantified. The characteristic time constant can represent the time required for the same multiple change of the arc resistance value. The shorter the time is, the better the arc extinction effect of the to-be-detected gas medium is, and the stronger the cooling performance is. By comparing the sizes of the characteristic time constants of the to-be-detected gas media, the differences in the cooling performance of the to-be-detected gas media can be determined, thereby providing a reference basis for the design of the circuit breaker and the selection of the gas. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above and other features, advantages, and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, same or similar reference numerals can represent same or similar elements. It should be understood that the drawings are schematic, and the original and elements are not necessarily drawn according to the scale.

[0036] Figure 1 A system architecture diagram for implementing the method for detecting the cooling performance of the gas on the axial arc is provided for the embodiments of the present application.

[0037] Figure 2 A flowchart of the method for detecting the cooling performance of the gas on the axial arc is provided for the embodiments of the present application.

[0038] Figure 3 A structural diagram of an electronic device is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation part of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0040] The embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems as the technology develops and new scenarios appear.

[0041] The terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the terms used in this way can be interchanged, and this is merely a distinguishing way adopted in the description of the embodiments of the present application for the same attribute objects in the description. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that the processes, methods, systems, products or devices containing a series of units do not have to be limited to those units, but can include other units not clearly listed or inherent to these processes, methods, products or devices.

[0042] The present application can be applied to the field of electrical detection. The following will take the detection of the cooling performance of different gas media on the axial arc as an example to introduce multiple application scenarios of landing on products.

[0043] First, an optional application scenario of the present application is introduced. In order to select an arc with strong extinguishing ability, an arc model based on control equation is simulated. In order to maintain the axial state of the arc, the burning time applied in the simulation is very short, for example, 74 μs, which is difficult to achieve in actual experiments, so the cooling performance of the gas medium measured by simulation has little reference significance for actual operation. In addition, even if the cooling performance of the gas medium on the axial arc is detected by actual experiment, the change of the burning time will inevitably affect the arc resistance, that is, with the increase of the burning time, the arc resistance also shows an upward trend, therefore, for the detection of the arc cooling ability of different gas media, the length of the burning time will directly affect the performance detection result.

[0044] In order to solve the above problems, the embodiments of the present application provide a method for detecting the cooling performance of gas on axial arc and related devices. The method for detecting the cooling performance of gas on axial arc and related devices of the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0045] Referring to Figure 1 , Figure 1 A system architecture diagram for implementing a method for detecting the cooling performance of gas on axial arc is shown, which includes an arc extinguishing chamber, a burning arc information acquisition module and a data processing unit.

[0046] The device designed around the switch contact of the arc extinguishing chamber has the core task of limiting the arc space position and accelerating arc extinguishing, ensuring safe interruption of the current during circuit breaking, and in the embodiments of the present application, includes a circuit breaker and a pre-charged test gas medium. Optionally, the test gas medium can also be filled on demand through real-time dynamic injection. The test gas medium can be any arc extinguishing medium such as pure gas (such as CO2, N2, SF6), mixed gas (such as C4F7N / CO2, C5F 10 O / CO2) and the like.

[0047] The arc burning information acquisition module is used to acquire arc burning information of the circuit breaker in the arc extinguishing chamber during each breaking process, and the arc burning information can include arc burning time during breaking, voltage signal, current signal, temperature and the like of the arc between the breaking points of the circuit breaker during the arc burning time, and the arc burning information is transmitted to the data processing unit. The data processing unit processes the arc burning information corresponding to each breaking of each test gas medium according to the method for detecting the cooling performance of the axial arc on the gas described below, and determines the cooling performance of the axial arc of each test gas medium.

[0048] Referring to Figure 2 , Figure 2 A flowchart of a method for detecting the cooling performance of the axial arc on the gas provided by the embodiments of the present application is shown in Figure 2 The method for detecting the cooling performance of the axial arc on the gas provided by the embodiments of the present application can include steps S110 to S140, which will be described in detail below.

[0049] Step S110, under the action of each test gas medium, a circuit breaker with the same operating parameters is controlled to break in a preset arc burning interval corresponding to the test gas medium, and arc burning information corresponding to the breaking is acquired.

[0050] The arc burning information at least includes actual arc burning time and voltage signal and current signal between the breaking points of the circuit breaker during the actual arc burning time; the preset arc burning interval is an arc burning time interval for maintaining the axial arc of the circuit breaker, and optionally, the preset arc burning interval usually refers to the shortest arc burning time of the circuit breaker and a preset time period after the shortest arc burning time, for example, the shortest arc burning time is 10 ms, and the preset arc burning interval can be set to [10 ms, 15 ms].

[0051] The circuit breaker is controlled to perform an opening experiment under a specific gas medium, and arc burning information of an arc generated during the opening process is obtained. Specifically, the opening control is performed for each type of gas medium to be tested, and the circuit breakers used for opening of all the gas media to be tested are ensured to be operated under the same operating parameters (such as voltage, current, contact opening distance, etc.), so as to exclude the interference of other variables on the arc and ensure that the gas medium is the only variable affecting the arc extinction in all the openings.

[0052] Subsequently, the preset arc burning interval is a preset arc burning time range of the circuit breaker generating an axial arc under the gas medium, for example, [10 ms, 15 ms] indicates that the arc burning time of the circuit breaker is kept between 10 ms and 15 ms under the gas medium, and the generated arc remains axial. Based on this, the circuit breaker is controlled to perform an opening under the gas medium to be tested, and the arc burning time is within the preset arc burning interval, and arc-related arc burning information such as arc voltage, current, temperature, light intensity, etc. between the arc-extinguishing contact gaps is collected during the opening process, so as to analyze the influence of different gas media on the arc burning characteristics of the circuit breaker in the subsequent analysis.

[0053] Optionally, the arc burning information can be collected at a preset sampling interval within a period of time before the current zero point (arc extinction), and the preset sampling interval needs to ensure the accuracy of the calculation of the arc resistance and other parameters. For example, the arc burning information is collected at a sampling interval of ≤0.5 μs starting from 10 μs before the arc extinction.

[0054] In step S120, the intersection of the actual arc burning time corresponding to all the gas media to be tested is taken as a common arc burning interval.

[0055] Based on the operation in step S110, the arc burning information of at least one opening process of the circuit breaker in the preset arc burning interval can be obtained for each gas medium to be tested, and the arc burning information of one opening process is taken as an example for description in this embodiment.

[0056] The actual arc burning time data obtained under different gas media to be tested in step S110 is integrated and analyzed, the common overlapping part of the actual arc burning time corresponding to all the gas media is found, and a common arc burning interval suitable for all the gas media is determined, so as to reduce or eliminate the influence of inconsistent arc evolution stages in the comparison of different experimental results on the results, and make the cooling performance of different gas media to the arc as the only variable affecting the arc extinction.

[0057] It can be understood that the evolution of the electric arc usually goes through the stages of ignition (contact opening), stable combustion, decay and extinction, and the duration of each stage may be different under different gas media. By selecting the intersection interval of the actual arc burning time under all gas media, i.e. the time period during which the electric arc exists under all gas media, it can be ensured that the embodiment can only be aimed at the synchronization stage of the electric arc evolution, at which the electric arcs under different gas media are all in the same or comparable evolution stage, avoiding the difference in electric arc energy caused by the difference in time evolution, so that the gas medium is no longer the only variable affecting the electric arc cooling.

[0058] In step S130, the characteristic time constant corresponding to each to-be-tested gas medium is determined according to the electric arc resistance characteristics reflected by the voltage signal and the current signal between the breaking points of the circuit breaker in the common arc burning interval corresponding to each to-be-tested gas medium. The characteristic time constant represents the time required for the electric arc resistance value to change by the same multiple.

[0059] In step S140, the differences in the cooling performance of the axial electric arc between the to-be-tested gas media are determined by comparing the characteristic time constants corresponding to each to-be-tested gas medium.

[0060] According to the voltage and current signals between the breaking points of the circuit breaker in the common arc burning interval under each to-be-tested gas medium environment during a breaking process, the resistance characteristics of the electric arc in the common arc burning interval of this breaking process are determined based on resistance calculation methods such as Ohm's law (R=U / I) or differential resistance method. For example, the change curve of the electric arc resistance with time is calculated, which reflects the dynamic process of the electric arc recovering from the high-conductivity state (low resistance) to the insulating state (high resistance). Since the common interval has eliminated the interference of inconsistent electric arc evolution stages, the difference in the resistance curve is directly caused by the physical properties of the gas medium.

[0061] The characteristic time constant is a quantitative representation of the same multiple of the change in the electric arc resistance value. The same multiple refers to the multiple of the change in the electric arc resistance under the breaking of other to-be-tested gas medium environments. In one possible implementation, the same multiple can also be pre-set to a target multiple, for example, the time required for the electric arc resistance to change by the target multiple (such as 3 times) is taken as the characteristic time constant, so as to unify the multiple of the change in the electric arc resistance of all gas media.

[0062] Optionally, the change curve of the electric arc resistance is fitted, and the time required for the electric arc resistance to rise from the initial value to the multiple of the change in the electric arc resistance under other to-be-tested gas medium environments is taken as the characteristic time constant. For example, the time required for the electric arc resistance to rise from the initial value to 3 times the initial value under CO2 environment is 1 ms. Based on this, the time required for the electric arc resistance to change from the initial value to the same multiple (3 times) as CO2 under N2 environment is determined as the characteristic time constant of N2 by fitting.

[0063] Based on this, the change multiples of the arc resistances of different gas media are unified, it is ensured that the comparison is the performance of the gas media under the same "cooling effect", and the time required for the same multiple change is compared, that is, the time required for each gas medium to achieve the same "cooling effect" is compared, and then the cooling performance of each gas medium can be compared. For example, if the time required for the arc resistance of gas A to reach the target multiple is shorter than that of gas B, it means that gas A carries away more arc heat in the same time, and the cooling performance is stronger. Therefore, by comparing the characteristic time constants of different gas media, the advantages and disadvantages of the arc extinguishing performance / cooling performance can be intuitively detected and evaluated.

[0064] In summary, the method for detecting the cooling performance of a gas on an axial arc provided in the present application controls the opening of the circuit breaker in the preset arcing interval corresponding to each to-be-detected gas medium, so that the arc formed in the opening process of the circuit breaker maintains an axial shape. In this way, the arcing information of the circuit breaker under the action of each to-be-detected gas medium, which can represent the characteristics of the axial arc, is obtained. Further, based on the actual arcing time of all to-be-detected gas media, a common arcing interval is selected to reduce or eliminate the influence of inconsistent arc evolution stages in the comparison of different experimental results on the results, so that the cooling performance of different to-be-detected gas media on the arc is the only variable affecting the arc extinction. Based on this, the arc resistance characteristics are extracted according to the voltage and current signals measured under the action of each to-be-detected gas medium, and the characteristic time constant is quantified. The characteristic time constant can represent the time required for the same multiple change of the arc resistance value. The shorter the time, the better the arc extinguishing effect of the to-be-detected gas medium, and the stronger the cooling performance. By comparing the sizes of the characteristic time constants of each to-be-detected gas medium, the cooling performance differences between the to-be-detected gas media can be determined, thereby providing a reference for the design of the circuit breaker and the selection of the gas.

[0065] Next, the following examples are used to illustrate other possible implementations of the method for detecting the cooling performance of a gas on an axial arc provided in the embodiments of the present application.

[0066] In a possible implementation, the step S130 of determining the characteristic time constant corresponding to each gas medium to be tested according to the arc resistance characteristics reflected by the voltage signal and the current signal between the breaking gap of the circuit breaker in the common arcing interval of each gas medium to be tested can include: determining the arc resistance values corresponding to a preset number of sampling time points in the common arcing interval for each gas medium to be tested according to the voltage signal and the current signal between the breaking gap in the common arcing interval in the breaking arcing information obtained under the action of each gas medium to be tested; fitting the arc resistance curve function corresponding to each gas medium to be tested in the common arcing interval of the breaking process based on the arc resistance values corresponding to the preset number of sampling time points in the common arcing interval; and determining the characteristic time constant of the breaking process corresponding to each gas medium to be tested based on the arc resistance curve function corresponding to each gas medium to be tested.

[0067] Based on the common arcing interval, the arc resistance in the breaking process of the breaking gap is calculated using the arc voltage and the current signal between the breaking gap for each breaking experiment in the common arcing interval. Optionally, for the sampling time point (sampling time point) with a time interval > 0.5 μs from the time point of the final zero crossing of the current (arc extinguishing), the resistance value of the sampling time point is calculated by using Ohm's law (R=U / I); for the sampling time point with a time interval ≤ 0.5 μs from the time point of the final zero crossing of the current, the arc resistance value of the sampling time point is determined by comparing the calculation results of the differential resistance method (R=dU / dI) and Ohm's law, that is, the larger calculation value of R=U / I and R=dU / dI is selected as the arc resistance between the breaking gap.

[0068] Subsequently, the arc resistance values of the sampling time points in the common arcing interval corresponding to each breaking experiment are fitted by a preset mathematical fitting method, such as the least square method, the least mean square method, etc., to obtain the arc resistance curve function of the common arcing interval of each breaking experiment, such as the equivalent arc resistance equation of formula (1), from which the characteristic time constant τ corresponding to each breaking experiment is determined.

[0069]

[0070] wherein, R arc represents the equivalent arc resistance corresponding to t2, R1 and t1 represent the reference arc resistance and the sampling time point corresponding thereto respectively, and τ is the characteristic time constant.

[0071] In the embodiments of the present application, the equivalent arc resistance equation mainly reflects the arc change between the fracture in a very short time period before the current zero-crossing point, and the sampling time point needs to be selected to make the equivalent resistance obtained by fitting have good consistency with the actual resistance. Among them, the sampling time point can be selected from the time interval in which the arc resistance changes greatly, and the reference arc resistance R1 and the reference point t1 can be selected as close to the current zero-crossing point as possible, so that the equivalent arc resistance curve obtained by calculation between the current zero-crossing point and the reference point has good consistency with the experimental arc resistance curve.

[0072] In a possible implementation, the breaking is a preset number of breakings, and each to-be-tested gas medium corresponds to arc burning information corresponding to each breaking, and a characteristic time constant corresponding to each breaking process is determined according to the arc burning information corresponding to each breaking.

[0073] It can be understood that under the action of the same gas medium, a single breaking may cause accidental deviation of the arc burning information due to random factors such as contact surface state and gas flow fluctuation, and multiple repeated experiments can obtain multiple groups of independent arc burning information, so as to eliminate random errors through statistics, improve the accuracy of the arc burning information, and thus improve the reliability of the detection result of the cooling performance of the gas medium. Therefore, the embodiments of the present application perform multiple breaking experiments in a preset arc burning interval for each to-be-tested gas medium.

[0074] After the circuit breaker is broken for a preset number of times (for example, 3 times or more than 3 times), for each to-be-tested gas medium, the arc burning information corresponding to each breaking and the characteristic time constant τ of the common arc burning interval in each breaking process determined according to the arc burning information corresponding to each breaking can be obtained.

[0075] Based on this, the characteristic time constants corresponding to each to-be-tested gas medium are compared to determine the differences in the cooling performance of the axial arc between the to-be-tested gas media, which can include: performing statistics on the characteristic time constant corresponding to each breaking process of each to-be-tested gas medium to obtain a statistical value corresponding to each to-be-tested gas medium; and comparing the statistical values corresponding to each to-be-tested gas medium to determine the differences in the cooling performance of the axial arc between the to-be-tested gas media.

[0076] In the case that each to-be-tested gas medium corresponds to multiple characteristic time constants τ, for each to-be-tested gas medium, the multiple characteristic time constants can be statistically derived to obtain a new parameter, that is, a statistical value, such as the average, mode, and standard deviation of the characteristic time constant, which reflects the consistency of the medium performance.

[0077] Optionally, for each to-be-tested gas medium, there are multiple characteristic time constants τ, and the average of all the characteristic time constants is calculated as shown in the following formula (2).

[0078]

[0079] wherein n represents the total number of characteristic time constants τ corresponding to the gas medium under test, τ i represents the i-th characteristic time constant τ.

[0080] It can be understood that the statistical value is only a value reflecting the consistency of the plurality of characteristic time constants τ, and has the same evaluation characteristics as the characteristic time constant τ, that is, the smaller the statistical value (such as the average value ) is, the higher the ability of the high-speed axial gas blowing of the gas medium under test to attenuate the arc is, and the higher the ability of the axial arc cooling is, and on this basis, the cooling performance of the plurality of gas media under test can be compared.

[0081] In one possible implementation, under the action of each gas medium under test, the circuit breaker with the same operating parameter is controlled to open in the preset arcing interval corresponding to the gas medium under test, including: under the action of each gas medium under test, the circuit breaker with the same operating parameter is controlled to open, and the shortest arcing time corresponding to the gas medium under test is determined; in a preset interval of the shortest arcing time, the preset arcing interval corresponding to the gas medium under test is determined; at least one arcing time point in the preset arcing interval is determined; and the circuit breaker with the same operating parameter is controlled to open at each arcing time point.

[0082] The embodiment of the present application determines the arcing interval based on the shortest arcing time to ensure that the arc extinguishing object is the axial arc. Because the axial arc is usually formed and stably exists at the initial arc ignition stage and the short arcing time, at this time, the arc is affected by the extremely strong jet throat airflow, and the form is concentrated in the axial path of the contact, which can reflect the maximum ability of the gas to take away the arc heat; and as the arcing time is prolonged, the arc may be distorted due to the contact ablation, airflow disturbance or electromagnetic force effect, and cannot reflect the maximum cooling effect of the gas on the arc. Therefore, by selecting the interval corresponding to the shortest arcing time, the arc can be limited to always be in the stable stage dominated by the axial direction, the interference of the non-axial arc is avoided, and thus the extinguishing ability of the gas medium on the axial arc can be accurately evaluated.

[0083] The preset arcing interval is a preset short arcing time range of the circuit breaker generating an axial arc under the gas medium, for example, [10ms, 15ms] indicates that the arcing time of the circuit breaker is kept between 10ms and 15ms under the gas medium, and the generated arc will remain axial. At least one arcing time point is selected within the preset arcing interval, and a plurality of arcing time points are determined at a preset time interval from the start of the interval, for example, a plurality of arcing time points are determined at a time interval of 1ms within [10ms, 15ms], that is, 10ms, 11ms, 12ms, 13ms, 14ms, and 15ms. Taking 13ms as an example, the opening experiment at the arcing time point 13ms indicates that the circuit breaker is controlled to open and the arcing time is kept at 13ms.

[0084] On this basis, in combination with the above description of multiple opening to improve the accuracy of arcing information, multiple openings can also be performed for each determined arcing time point, and the actual arcing time, arc voltage and current signal between the breaking points of each opening are recorded.

[0085] In a possible implementation, the determination process of the operating parameter of the circuit breaker includes: determining, as the operating parameter, a current corresponding to an arc temperature generated by the current in the opening process and satisfying a preset condition that the arc temperature does not cause metal droplets and vaporization on the contact surface.

[0086] In the process of opening the current by the circuit breaker, the current generates an arc when passing through the contact gap. The arc temperature changes with the size of the current, the opening time and other factors. Different current sizes generate arcs of different intensities, which in turn result in different arc temperatures. If the arc temperature is too high, it causes metal droplets and vaporization on the contact surface, and introduces metal particles between the breaking points. These metal particles may have high thermal conductivity and will accelerate heat conduction, making the temperature of the measured gas medium appear to drop faster, but in fact, it is not the improvement of the cooling performance of the measured gas medium itself, but the result of the additional heat conduction of the metal particles. This conceals the real cooling capacity of the measured gas medium, resulting in detection results that cannot accurately reflect its performance under normal working conditions.

[0087] Therefore, the embodiments of the present application select a current corresponding to an arc temperature that does not cause metal droplets and vaporization on the contact surface, such as less than 5kA, as the opening current of all opening experiments of the embodiments, to avoid the influence of metal particles in the metal vapor on the detection results.

[0088] In summary, the method for detecting the cooling performance of a gas on an axial arc provided in this application embodiment determines the common arcing range of different test gas media by conducting an opening and closing experiment with the same operating parameters at a low degree of ignition. This ensures that no other impurities are introduced during the experiment and guarantees the arc between the high-speed gas blowing action and the break point. During the opening and closing process, the arc voltage and current signals between the break points are collected, and the experimental arc resistance is determined by Ohm's law and the differential resistance method. Furthermore, the equivalent arc resistance curve closest to the experiment is obtained through numerical fitting, and the equivalent time constant τ (characteristic time constant) corresponding to the arcing time point of each gas medium is determined. Within the common arcing range, the arithmetic mean of the equivalent time constant τ corresponding to all arcing time points included in the common arcing range is calculated to obtain the equivalent time constant τ for each test gas medium. Comparison of various test gas media Determine the differences in cooling performance of the axial electric arc among the various gas media to be tested.

[0089] Based on this, the embodiments of this application achieve a quantitative assessment of the cooling capacity of the gas medium under test for the axial arc by fitting the equivalent arc resistance and calculating the mean value of the characteristic time constant, overcoming the limitations of traditional assessment methods that rely on experience or qualitative judgment. Furthermore, the selection of operating parameters such as interruption current and voltage avoids the introduction of other impurities during the current interruption process, and the setting of a short arcing interval avoids axial arc distortion caused by a long arc, further improving the accuracy of the assessment of the cooling performance of the gas medium for the axial arc. In addition, all detection and calculation in the embodiments of this application are based on arc voltage, current, and other data collected during the actual interruption process, fully considering the real effect of the extinguishing medium on the arc under high-speed air blowing and turbulent conditions, making the cooling performance test results more consistent with actual working conditions.

[0090] The above describes a method for detecting the cooling performance of a gas on an axial electric arc, as provided in the embodiments of this application. The following describes the apparatus for performing the above method for detecting the cooling performance of a gas on an axial electric arc.

[0091] This application also provides an electronic device in its embodiments. (See reference...) Figure 3 The diagram illustrates a structural schematic suitable for implementing the electronic device in the embodiments of this application. The electronic device in the embodiments of this application may include, but is not limited to, fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 3 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0092] like Figure 3As shown, the electronic device can include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601 that can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 602 or loaded into a random access memory (RAM) 603 from a storage device 608. In a state in which the electronic device is powered on, various programs and data required for operation of the electronic device are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0093] Generally, the following devices can be connected to the I / O interface 605: input devices 606 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 608 including, for example, a memory card, a hard disk, etc.; and communication devices 609. The communication devices 609 can allow the electronic device to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 3 An electronic device having various devices is shown, but it is understood that all of the shown devices are not required to be implemented or possessed. More or fewer devices can be alternatively implemented or possessed.

[0094] The embodiment of the present application further provides a computer program product comprising computer readable instructions, which, when executed on an electronic device, cause the electronic device to implement any one of the methods for detecting the cooling performance of a gas on an axial arc provided by the embodiments of the present application.

[0095] The embodiment of the present application further provides a computer readable storage medium carrying one or more computer programs, which, when executed by an electronic device, can cause the electronic device to implement any one of the methods for detecting the cooling performance of a gas on an axial arc provided by the embodiments of the present application.

[0096] In addition, it should be noted that the above-described device embodiments are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments. In addition, the connection relationship between the modules in the device embodiments provided by the present application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines.

[0097] Those skilled in the art can clearly understand that the application can be implemented by means of software plus necessary universal hardware, and of course can also be implemented by means of dedicated hardware including special integrated circuit, special CPU, special memory, special component, etc. Generally, any function completed by computer program can be easily implemented by corresponding hardware, and the specific hardware structure for implementing the same function can also be various, such as analog circuit, digital circuit or special circuit, etc. However, for the application, software program implementation is a better embodiment. Based on such understanding, the technical solution of the application or the part of the application which makes contribution to the prior art can be embodied in the form of software product, which is stored in readable storage medium, such as computer floppy disk, U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk, etc., and includes a plurality of instructions for making a computer device (which can be personal computer, training device or network device, etc.) execute the method described in various embodiments of the application.

[0098] In the above embodiments, the implementation can be achieved by software, hardware, firmware or any combination thereof, entirely or partially. When implemented by software, the implementation can be achieved in the form of a computer program product, entirely or partially.

[0099] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the flow or function described in the embodiments of the application is generated entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another, for example, the computer instructions can be transmitted from one website, computer, training device or data center to another website, computer, training device or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be stored by the computer or a data storage device such as training device, data center, etc. integrated with one or more available media sets. The available medium can be magnetic medium (such as floppy disk, hard disk, magnetic tape), optical medium (such as DVD) or semiconductor medium (such as solid state disk (SSD)) etc.

Claims

1. A method of detecting the cooling performance of a gas on an axial arc, characterized in that, The method comprises the following steps: controlling the circuit breaker under the action of each to-be-tested gas medium, breaking in a preset arcing interval corresponding to the to-be-tested gas medium, and obtaining arcing information corresponding to the breaking, the arcing information at least comprising an actual arcing time and a voltage signal and a current signal between breaking points of the circuit breaker in the actual arcing time; the preset arcing interval is an arcing time interval in which the arc of the circuit breaker is kept in an axial arc; taking an intersection of the actual arcing time corresponding to all the to-be-tested gas media as a common arcing interval; determining a characteristic time constant corresponding to each to-be-tested gas medium according to the arc resistance characteristic reflected by the voltage signal and the current signal between the breaking points of the circuit breaker in the common arcing interval corresponding to each to-be-tested gas medium, the characteristic time constant representing a time required for the arc resistance value to change by the same multiple; comparing the characteristic time constant corresponding to each to-be-tested gas medium to determine a difference in cooling performance of the axial arc between the to-be-tested gas media.

2. The method of detecting the cooling performance of a gas on an axial arc according to claim 1, wherein The method of determining the characteristic time constant corresponding to each to-be-tested gas medium according to the arc resistance characteristic reflected by the voltage signal and the current signal between the breaking points of the circuit breaker in the common arcing interval corresponding to each to-be-tested gas medium comprises: determining an arc resistance value corresponding to a preset number of collection time points in the common arcing interval according to the voltage signal and the current signal between the breaking points in the common arcing interval in the arcing information corresponding to the breaking obtained under the action of each to-be-tested gas medium; fitting an arc resistance curve function corresponding to each to-be-tested gas medium in the common arcing interval of the breaking process based on the arc resistance value corresponding to the preset number of collection time points in the common arcing interval; determining a characteristic time constant of the breaking process corresponding to each to-be-tested gas medium based on the arc resistance curve function corresponding to each to-be-tested gas medium.

3. The method of detecting the cooling performance of a gas on an axial arc according to claim 1, wherein The preset arcing interval is limited by a shortest arcing time of the breaking of the circuit breaker and a preset time period after the shortest arcing time.

4. The method of detecting the cooling performance of a gas on an axial arc according to claim 3, wherein The method of controlling the circuit breaker under the action of each to-be-tested gas medium and breaking in the preset arcing interval corresponding to the to-be-tested gas medium comprises: determining at least one arcing time point in the preset arcing interval; controlling the circuit breaker to break at each arcing time point.

5. The method of detecting the cooling performance of a gas on an axial arc according to any one of claims 1 to 4, characterized in that, If the breaking is a preset number of times, each to-be-tested gas medium has arcing information corresponding to each breaking, and a characteristic time constant corresponding to each breaking process is determined according to the arcing information corresponding to each breaking. The method of comparing the characteristic time constant corresponding to each to-be-tested gas medium to determine the difference in cooling performance of the axial arc between the to-be-tested gas media comprises: statistically processing the characteristic time constant corresponding to each breaking process of each to-be-tested gas medium to obtain a statistical value corresponding to each to-be-tested gas medium; Determine the difference in cooling performance of the axial arc among the to-be-tested gas media by comparing the statistical values corresponding to each of the to-be-tested gas media.

6. The method of detecting the cooling performance of a gas on an axial arc according to any one of claims 1 to 4, characterized in that, The determination process of the operating parameter of the circuit breaker comprises: Determine the current satisfying a preset condition as the operating parameter according to the arc temperature corresponding to the current generated in the breaking process, and the preset condition is that the arc temperature does not cause the phenomenon of metal droplet and vaporization on the contact surface.

7. A system for detecting the cooling performance of a gas on an axial arc, characterized in that Comprise: The arc chamber, the arc information acquisition module and the data processing unit; The arc chamber comprises a circuit breaker and a pre-charged to-be-tested gas medium; The arc information acquisition module is configured to acquire arc information of the circuit breaker in each breaking process in the arc chamber; The data processing unit is configured to implement the method for detecting the cooling performance of the axial arc of the gas according to any one of claims 1 to 6.

8. A computer program product, characterised in that, The computer readable instructions, when executed on an electronic device, cause the electronic device to implement the method for detecting the cooling performance of the axial arc of the gas according to any one of claims 1 to 6.

9. An electronic device, comprising: The memory is configured to store a computer program; The processor is configured to execute the computer program to enable the electronic device to implement the method for detecting the cooling performance of the axial arc of the gas according to any one of claims 1 to 6. The storage medium carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, the electronic device can implement the method for detecting the cooling performance of the axial arc of the gas according to any one of claims 1 to 6.

10. A computer storage medium, characterized in that, ​

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