Breaker on-off result evaluation method and device, terminal equipment and storage medium

Abstract

The invention provides an on-off result evaluation method and device of a circuit breaker, terminal equipment and a storage medium, and the method comprises the steps: obtaining an electric arc enthalpy flow physical model, carrying out the similarity analysis of the electric arc enthalpy flow physical model based on a similarity theory, and obtaining a universal relation expression of an electric arc behavior under different operation conditions; performing similarity calculation on the general relational expression, and obtaining a proportional relation between the arc voltage and the air chamber pressure based on a similarity calculation result; simulating the to-be-tested circuit breaker, obtaining the air chamber pressure of the to-be-tested circuit breaker at the current zero crossing point, fitting the proportional relation by combining the air chamber pressure and a plurality of voltage arc-extinguishing peaks, and generating a voltage arc-extinguishing peak reference value for representing the on-off state of the to-be-tested circuit breaker; and generating an on-off evaluation result of the to-be-tested circuit breaker based on a comparison result of the voltage arc extinguishing peak of the to-be-tested circuit breaker and the voltage arc extinguishing peak reference value. According to the invention, the evaluation accuracy of the on-off result of the circuit breaker under the asymmetric short-circuit current can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of data analysis and processing, and in particular to a method, device, terminal equipment and storage medium for evaluating the breaking results of a circuit breaker. Background Art

[0002] As the core protection equipment in the power system, high-voltage circuit breakers undertake the important tasks of quickly breaking the current, isolating the fault area, and ensuring the safe and stable operation of the system when a short-circuit fault occurs in the power system. With the continuous expansion of the scale of the power system, the increasing voltage level, and the access to new energy, the short-circuit current characteristics of the system have become more complex. Among them, the frequency of asymmetric short-circuit current (i.e., short-circuit current with a significant DC component) is increasing, which poses a more severe challenge to the breaking capacity of high-voltage circuit breakers. Failure to break will lead to the expansion of the fault range, damage to equipment, and prolonged power outage time, and even trigger a chain reaction, causing huge economic losses and social impacts.

[0003] At present, the main methods for evaluating the breaking capacity of circuit breakers are to use empirical formulas, arc black box model simulation or magnetohydrodynamic model simulation. The empirical formula is to summarize some simplified formulas based on historical data and experience for estimation. This method is simple and easy to implement, but the accuracy is low, and it lacks experimental verification and is difficult to adapt to new situations; arc black box model simulation uses mathematical models to simulate and analyze arc characteristics, and then evaluate the breaking capacity. This method can reflect the dynamic process of the arc, but the model parameters are difficult to set, and there is a certain deviation between the simulation results and the actual situation; magnetohydrodynamic model simulation is a more complex simulation method that can simulate the arc plasma flow and energy transfer process. The results are relatively accurate, but the calculation is large, time-consuming, and difficult to apply to actual projects. Most of the existing methods are based on idealized assumptions, which have large deviations from actual working conditions, resulting in low credibility of the evaluation results. Moreover, they are only analyzed for specific models or specific working conditions, lack universality and extrapolation, and are difficult to promote and apply. Accurately evaluating the breaking capacity of high-voltage circuit breakers under asymmetric short-circuit currents is crucial to ensuring the safe and reliable operation of power systems. How to accurately monitor the breaking performance of high-voltage circuit breakers under asymmetric short-circuit current is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present invention aims to provide a method, device, terminal equipment and storage medium for evaluating the breaking results of a circuit breaker to solve the above technical problems and improve the accuracy of the breaking result evaluation of a high-voltage circuit breaker under an asymmetric short-circuit current.

[0005] In order to solve the above technical problems, the present invention provides a method for evaluating the breaking result of a circuit breaker, comprising:

[0006] Obtaining an arc enthalpy flow physical model, and performing similarity analysis on the arc enthalpy flow physical model based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions; wherein the arc enthalpy flow physical model is used to describe the process from arc generation to arc extinction in a high-voltage circuit breaker;

[0007] Performing similarity calculation on the general relationship expression, and obtaining the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result;

[0008] The circuit breaker to be tested is simulated, the air chamber pressure of the circuit breaker to be tested at the current zero point is obtained, the proportional relationship is fitted in combination with the air chamber pressure and a number of voltage arc-extinction spikes, a voltage arc-extinction spike reference value for characterizing the switching state of the circuit breaker to be tested is generated, and a breaking evaluation result of the circuit breaker to be tested is generated based on a comparison result between the voltage arc-extinction spike of the circuit breaker to be tested and the voltage arc-extinction spike reference value.

[0009] The arc enthalpy flow physical model can describe in detail the whole process from arc generation to arc extinction. In the above scheme, similarity analysis of the arc enthalpy flow physical model is performed through similarity theory, and a general relational expression can be obtained under different operating conditions, which makes the breaking evaluation method more widely applicable and extrapolable, and can adapt to different circuit breaker models and working conditions. Through similarity calculation, the proportional relationship between arc voltage and gas chamber pressure is obtained, which realizes the quantitative evaluation of arc behavior and helps to understand and predict arc characteristics more accurately. Compared with the arc black box model, the analysis through similarity theory simplifies the complexity of model parameter setting and reduces the difficulty of the simulation process. By simulating and obtaining the gas chamber pressure of the circuit breaker under test at the current zero crossing point, the dynamic behavior of the circuit breaker can be reflected in real time, providing accurate data support for subsequent evaluation. Furthermore, by fitting and generating the voltage arc extinction peak reference value of the circuit breaker under test, a personalized evaluation of the breaking performance of a specific circuit breaker can be achieved, avoiding the limitations of the general method. And based on the comparison between the actual voltage arc extinction peak and the reference value, the breaking evaluation result is generated, which can reflect the breaking status of the circuit breaker in real time and provide timely feedback for practical applications.

[0010] In one implementation, the arc enthalpy flow physical model is subjected to similarity analysis based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions, specifically including:

[0011] Select several arc phenomena with the same properties and divide the arc phenomena into independent variable arc phenomena and dependent variable arc phenomena; wherein the expression of the arc phenomenon is:

[0012] x 1β , x 2β , ..., x nβ (β=1,2,……,n);

[0013] In the formula, β is the phenomenon of arc in a certain state in the high-voltage circuit breaker, and n is the number of selected arc phenomena;

[0014] The arc phenomenon conforms to the complete set of equations; wherein the expression of the complete set of equations is:

[0015] D l (x 1β , x 2β , ..., x nβ )=0(l=1,2,...,m);

[0016] Where D l is a set of matrix equations, l is the number of rows, and m is the number of arc phenomena that are dependent variables in the arc phenomenon;

[0017] According to the relational expression of the complete set of equations, the universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained, and based on the universal proportional coefficient, a universal relational expression of the arc behavior under different operating conditions is generated; wherein the expression of the relational expression is:

[0018] x nβ =c nβ x n1 ;

[0019] In the formula, c nβ is the proportional factor; x n1 It is the quantity field in the initial phenomenon; for the phenomenon of β=1, it is called the initial phenomenon.

[0020] In one implementation, obtaining the universal proportionality coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model according to the relational expression of the complete set of equations, and generating the universal relational expression of the arc behavior under different operating conditions based on the universal proportionality coefficient specifically includes:

[0021] Based on the relationship, a universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained; wherein the physical parameters include arc voltage, arc current, specific enthalpy change, gas density, arc column cross-sectional area, gas flow velocity, gas pressure, conductivity, arc column transverse coordinate, gas constant and temperature;

[0022] Substituting the universal proportionality coefficient of each physical parameter into the equation of the arc enthalpy flow physical model, a universal relational expression of arc behavior under different operating conditions is obtained; wherein the universal relational expression is:

[0023]

[0024]

[0025] In the formula, c uβ is the transformation multiplier of arc voltage u and arc voltage u in arc phenomenon β; c iβ u is the transformation multiplier between arc current i and arc current i in arc phenomenon β; βc is the ratio of the arc voltage u to the arc voltage u in the arc phenomenon β; i βc is the ratio of arc current i to arc current i in arc phenomenon β; c ρβ is the transformation multiplier between gas density ρ and gas density ρ in arc phenomenon β; c vβ is the transformation multiplier between the gas flow rate v and the gas flow rate v in the arc phenomenon β; c Aβ is the transformation multiplier between the arc column cross-sectional area A and the arc column cross-sectional area A in the arc phenomenon β; c hβ is the conversion multiplier of the specific enthalpy change Δh and the specific enthalpy change Δh in the arc phenomenon β; Δh βc is the ratio of the specific enthalpy change Δh to the specific enthalpy change Δh in the arc phenomenon β; ρ βc is the ratio of the gas density ρ to the gas density ρ in the arc phenomenon β; v βc is the ratio of the gas flow rate v to the gas flow rate v in the arc phenomenon β; σ βc is the ratio of conductivity σ to the conductivity σ in the arc phenomenon β; x βc A is the ratio of the arc column transverse coordinate x to the arc column transverse coordinate x in the arc phenomenon β; βc is the ratio of the arc column cross-sectional area A to the arc column cross-sectional area A in the arc phenomenon β; c pβ is the transformation multiplier between gas pressure p and gas pressure p in arc phenomenon β; c σβ is the conversion multiplier between the conductivity σ and the conductivity σ in the arc phenomenon β; c xβ is the transformation multiplier between the arc column transverse coordinate x and the arc column transverse coordinate x in the arc phenomenon β; p βc is the ratio of gas pressure p to gas pressure p in arc phenomenon β; c Rβ is the transformation multiplier between the gas constant R and the gas constant R in the arc phenomenon β; c Tβ is the conversion multiplier between temperature T and temperature T in arc phenomenon β; R βc is the ratio of the gas constant R to the gas constant R in the arc phenomenon β; T βc It is the ratio of temperature T to temperature T in arc phenomenon β.

[0026] In one implementation, performing similarity calculation on the general relationship expression and obtaining the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result specifically includes:

[0027] A similarity calculation is performed on the general relational expression to obtain a similarity calculation result; wherein the expression of the similarity calculation result is:

[0028]

[0029] According to the physical characteristics of the arc behavior, some transformation multipliers in the similarity calculation result are assigned, and the assigned result is substituted into the similarity calculation result to obtain the proportional relationship; wherein the expression of the proportional relationship is:

[0030]

[0031] Where k is the proportional factor.

[0032] In one implementation, the circuit breaker to be tested is simulated to obtain the air chamber pressure of the circuit breaker to be tested at the current zero-crossing point, and the proportional relationship is fitted in combination with the air chamber pressure and a plurality of voltage arc-extinguishing peaks to generate a voltage arc-extinguishing peak reference value for characterizing the switch state of the circuit breaker to be tested, specifically including:

[0033] Acquire the working parameters of the circuit breaker to be tested, perform arc physical simulation on the circuit breaker to be tested based on the working parameters and the enthalpy flow physical model, and obtain the air chamber pressure of the circuit breaker at the zero crossing point; wherein the working parameters include voltage, current, frequency, time constant and phase angle difference;

[0034] The proportional relationship is fitted in combination with a plurality of voltage arc-extinction peaks to obtain a reference value of the proportional factor, and the proportional relationship is corrected based on the reference value of the proportional factor to obtain a reference value of the voltage arc-extinction peak; wherein the plurality of voltage arc-extinction peaks include a first voltage arc-extinction peak corresponding to a successful breaking result of the circuit breaker under test and a second voltage arc-extinction peak corresponding to a failed breaking result.

[0035] In a second aspect, the present application further provides a circuit breaker breaking result evaluation device, comprising: a model analysis module, a similarity calculation module and a fitting evaluation module;

[0036] The model analysis module is used to obtain an arc enthalpy flow physical model, and perform similarity analysis on the arc enthalpy flow physical model based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions; wherein the arc enthalpy flow physical model is used to describe the process from arc generation to arc extinction in a high-voltage circuit breaker;

[0037] The similarity calculation module is used to perform similarity calculation on the general relationship expression, and obtain the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result;

[0038] The fitting evaluation module is used to simulate the circuit breaker to be tested, obtain the air chamber pressure of the circuit breaker to be tested at the current zero point, fit the proportional relationship in combination with the air chamber pressure and a number of voltage arc extinction spikes, generate a voltage arc extinction spike reference value for characterizing the switching state of the circuit breaker to be tested, and generate a breaking evaluation result of the circuit breaker to be tested based on a comparison result between the voltage arc extinction spike of the circuit breaker to be tested and the voltage arc extinction spike reference value.

[0039] In the above scheme, the arc enthalpy flow physical model can describe in detail the whole process from arc generation to arc extinction. In the above scheme, the arc enthalpy flow physical model is analyzed similarly by similarity theory, and a general relational expression can be obtained under different operating conditions, which makes the breaking evaluation method more widely applicable and extrapolable, and can adapt to different circuit breaker models and working conditions. Through similarity calculation, the proportional relationship between arc voltage and gas chamber pressure is obtained, which realizes the quantitative evaluation of arc behavior and helps to understand and predict arc characteristics more accurately. Compared with the arc black box model, the analysis through similarity theory simplifies the complexity of model parameter setting and reduces the difficulty of the simulation process. By simulating and obtaining the gas chamber pressure of the circuit breaker to be tested at the current zero point, the dynamic behavior of the circuit breaker can be reflected in real time, providing accurate data support for subsequent evaluation. Furthermore, by fitting and generating the voltage arc extinction peak reference value of the circuit breaker to be tested, a personalized evaluation of the breaking performance of a specific circuit breaker can be achieved, avoiding the limitations of the general method. And based on the comparison between the actual voltage arc extinction peak and the reference value, the breaking evaluation result is generated, which can reflect the breaking status of the circuit breaker in real time and provide timely feedback for practical applications.

[0040] In one implementation, the arc enthalpy flow physical model is subjected to similarity analysis based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions, specifically including:

[0041] Select several arc phenomena with the same properties and divide the arc phenomena into independent variable arc phenomena and dependent variable arc phenomena; wherein the expression of the arc phenomenon is:

[0042] x 1β , x 2β , ..., x nβ (β=1,2,……,n);

[0043] In the formula, β is the phenomenon of arc in a certain state in the high-voltage circuit breaker, and n is the number of selected arc phenomena;

[0044] The arc phenomenon conforms to the complete set of equations; wherein the expression of the complete set of equations is:

[0045] D l (x 1β , x2β , ..., x nβ )=0(l=1,2,...,m);

[0046] Where D l is a set of matrix equations, l is the number of rows, and m is the number of arc phenomena that are dependent variables in the arc phenomenon;

[0047] According to the relational expression of the complete set of equations, the universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained, and based on the universal proportional coefficient, a universal relational expression of the arc behavior under different operating conditions is generated; wherein the expression of the relational expression is:

[0048] x nβ =c nβ x n1 ;

[0049] In the formula, c nβ is the proportional factor; x n1 It is the quantity field in the initial phenomenon; for the phenomenon of β=1, it is called the initial phenomenon.

[0050] In one implementation, obtaining the universal proportionality coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model according to the relational expression of the complete set of equations, and generating the universal relational expression of the arc behavior under different operating conditions based on the universal proportionality coefficient specifically includes:

[0051] Based on the relationship, a universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained; wherein the physical parameters include arc voltage, arc current, specific enthalpy change, gas density, arc column cross-sectional area, gas flow velocity, gas pressure, conductivity, arc column transverse coordinate, gas constant and temperature;

[0052] Substituting the universal proportionality coefficient of each physical parameter into the equation of the arc enthalpy flow physical model, a universal relational expression of arc behavior under different operating conditions is obtained; wherein the universal relational expression is:

[0053]

[0054] In the formula, c uβ is the transformation multiplier of arc voltage u and arc voltage u in arc phenomenon β; c iβ u is the transformation multiplier between arc current i and arc current i in arc phenomenon β; βc is the ratio of the arc voltage u to the arc voltage u in the arc phenomenon β; i βc is the ratio of arc current i to arc current i in arc phenomenon β; c ρβis the transformation multiplier between gas density ρ and gas density ρ in arc phenomenon β; c vβ is the transformation multiplier between the gas flow rate v and the gas flow rate v in the arc phenomenon β; c Aβ is the transformation multiplier between the arc column cross-sectional area A and the arc column cross-sectional area A in the arc phenomenon β; c hβ is the conversion multiplier of the specific enthalpy change Δh and the specific enthalpy change Δh in the arc phenomenon β; Δh βc is the ratio of the specific enthalpy change Δh to the specific enthalpy change Δh in the arc phenomenon β; ρ βc is the ratio of the gas density ρ to the gas density ρ in the arc phenomenon β; v βc is the ratio of the gas flow rate v to the gas flow rate v in the arc phenomenon β; σ βc is the ratio of conductivity σ to the conductivity σ in the arc phenomenon β; x βc A is the ratio of the arc column transverse coordinate x to the arc column transverse coordinate x in the arc phenomenon β; βc is the ratio of the arc column cross-sectional area A to the arc column cross-sectional area A in the arc phenomenon β; c pβ is the transformation multiplier between gas pressure p and gas pressure p in arc phenomenon β; c σβ is the conversion multiplier between the conductivity σ and the conductivity σ in the arc phenomenon β; c xβ is the transformation multiplier between the arc column transverse coordinate x and the arc column transverse coordinate x in the arc phenomenon β; p βc is the ratio of gas pressure p to gas pressure p in arc phenomenon β; c Rβ is the transformation multiplier between the gas constant R and the gas constant R in the arc phenomenon β; c Tβ is the conversion multiplier between temperature T and temperature T in arc phenomenon β; R βc is the ratio of the gas constant R to the gas constant R in the arc phenomenon β; T βc It is the ratio of temperature T to temperature T in arc phenomenon β.

[0055] In one implementation, performing similarity calculation on the general relationship expression and obtaining the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result specifically includes:

[0056] A similarity calculation is performed on the general relational expression to obtain a similarity calculation result; wherein the expression of the similarity calculation result is:

[0057]

[0058] According to the physical characteristics of the arc behavior, some transformation multipliers in the similarity calculation result are assigned, and the assigned result is substituted into the similarity calculation result to obtain the proportional relationship; wherein the expression of the proportional relationship is:

[0059]

[0060] Where k is the proportional factor.

[0061] In one implementation, the circuit breaker to be tested is simulated to obtain the air chamber pressure of the circuit breaker to be tested at the current zero-crossing point, and the proportional relationship is fitted in combination with the air chamber pressure and a plurality of voltage arc-extinguishing peaks to generate a voltage arc-extinguishing peak reference value for characterizing the switch state of the circuit breaker to be tested, specifically including:

[0062] Acquire the working parameters of the circuit breaker to be tested, perform arc physical simulation on the circuit breaker to be tested based on the working parameters and the enthalpy flow physical model, and obtain the air chamber pressure of the circuit breaker at the zero crossing point; wherein the working parameters include voltage, current, frequency, time constant and phase angle difference;

[0063] The proportional relationship is fitted in combination with a plurality of voltage arc-extinction peaks to obtain a reference value of the proportional factor, and the proportional relationship is corrected based on the reference value of the proportional factor to obtain a reference value of the voltage arc-extinction peak; wherein the plurality of voltage arc-extinction peaks include a first voltage arc-extinction peak corresponding to a successful breaking result of the circuit breaker under test and a second voltage arc-extinction peak corresponding to a failed breaking result.

[0064] In a third aspect, the present application also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the circuit breaker breaking result evaluation method as described above is implemented.

[0065] In a fourth aspect, the present application further provides a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the circuit breaker breaking result evaluation method as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic flow chart of a method for evaluating a circuit breaker breaking result provided in one embodiment of the present invention;

[0067] Figure 2 A schematic diagram of an arc airflow flow field of a circuit breaker nozzle provided in one embodiment of the present invention;

[0068] Figure 3 A simulation result of a gas chamber pressure based on an arc enthalpy flow physical model provided in one embodiment of the present invention;

[0069] Figure 4 The present invention is a schematic diagram of a module of a circuit breaker breaking result evaluation device provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0070] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0071] The terms "first" and "second" and the like in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0072] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0073] Example 1

[0074] See also Figure 1 , Figure 1 The present invention provides a method for evaluating the breaking results of a circuit breaker, including steps 101 to 103, each of which is as follows:

[0075] Step 101: Obtain an arc enthalpy flow physical model, and perform similarity analysis on the arc enthalpy flow physical model based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions; wherein the arc enthalpy flow physical model is used to describe the process from arc generation to arc extinction in a high-voltage circuit breaker.

[0076] The arc enthalpy flow physical model is a mathematical model that comprehensively uses the principles of thermodynamics, fluid mechanics and electromagnetics to describe the behavior of the arc in the high-voltage circuit breaker, including the generation, development and extinction of the arc. The physical behavior of the arc in the high-voltage circuit breaker is simulated by numerical simulation methods. The thermodynamic and fluid dynamic characteristics of the arc need to be considered during the simulation process. Applying the basic principles of fluid mechanics, the mass conservation equation, momentum conservation equation, energy conservation equation, state equation, generalized Ohm's law equation and Maxwell equation can be obtained. The acquisition of the arc enthalpy flow physical model requires certain additional conditions.

[0077] See also Figure 2 , Figure 2 A schematic diagram of a flow field of an arc airflow at a circuit breaker nozzle provided in one embodiment of the present invention. In the embodiment of the present invention, for an arc in an axial airflow, when modeling at a high current stage, additional initial assumptions are introduced in the calculation of pressure formation:

[0078] 1) The arc column has an axially symmetrical shape; 2) The arc temperature is constant in both radial and axial directions throughout the entire volume of the arc column; 3) The pressure is independent of the arc radius and is equal to the cold gas pressure at the edge of the arc column; 4) All the arc power enters the axial gas flow.

[0079] In addition to the above-mentioned assumptions, an arc enthalpy flow physical model provided by an embodiment of the present invention also includes the following additional assumptions: 5) the airflow in the nozzle has a constant axial pressure gradient over the arc length; 6) the outlet airflow velocity is equal to the speed of sound.

[0080] Based on the above assumptions, the equation for obtaining the arc enthalpy flow physical model in the embodiment of the present invention is as follows:

[0081] Power balance equation:

[0082]

[0083] Momentum conservation equation:

[0084]

[0085] Ohm's Law Equation:

[0086]

[0087] Ideal gas state equation:

[0088]

[0089] Wherein, u is the arc voltage; i is the arc current; i is the gas pressure; v is the gas velocity; σ is the conductivity; A is the arc column cross-sectional area; ρ is the gas density; Δh is the specific enthalpy change; x is the arc column transverse coordinate; R is the gas constant; and T is the temperature.

[0090] In one embodiment, the arc enthalpy flow physical model is subjected to similarity analysis based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions, specifically including:

[0091] Select several arc phenomena with the same properties and divide the arc phenomena into independent variable arc phenomena and dependent variable arc phenomena; wherein the expression of the arc phenomenon is:

[0092] x1β , x 2β , ..., x nβ (β=1,2,……,n);

[0093] In the formula, β is the phenomenon of arc in a certain state in the high-voltage circuit breaker, and n is the number of selected arc phenomena;

[0094] The arc phenomenon conforms to the complete set of equations; wherein the expression of the complete set of equations is:

[0095] D l (x 1β , x 2β , ..., x nβ )=0(l=1,2,...,m);

[0096] Where D l is a set of matrix equations, l is the number of rows, and m is the number of arc phenomena that are dependent variables in the arc phenomenon;

[0097] According to the relational expression of the complete set of equations, the universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained, and based on the universal proportional coefficient, a universal relational expression of the arc behavior under different operating conditions is generated; wherein the expression of the relational expression is:

[0098] x nβ =c nβ x n1 ;

[0099] In the formula, c nβ is the proportional factor; x n1 It is the quantity field in the initial phenomenon; for the phenomenon of β=1, it is called the initial phenomenon.

[0100] In the embodiment of the present invention, when the properties of the gas-blowing arc are the same, n phenomena with the same properties are selected.

[0101] x 1β , x 2β , ..., x nβ (β=1,2,……,n);

[0102] Assume that the first y quantities are independent variables, and the remaining m=ny quantities are dependent variables. β corresponds to a certain state of the air-blowing arc flow process, and has the same nature as the process. Assume that the arc phenomenon x 1β , x 2β , ..., x nβ The quantity satisfies the complete system of equations D l :

[0103] D l (x 1β , x2β , ..., x nβ )=0(l=1,2,...,m);

[0104] D l As a set of matrix equations, l is the number of rows, and there are certain assumptions about the mathematical structure of this complete system of equations. 1β , x 2β , ..., x nβ can be related to each other by the following relationship: 1β =c 1β x 11 ;x 2β =c 2β x 21 ;……;x nβ =c nβ x n1 . It can also be simplified to in, is the transformation number set. The phenomenon of β = 1 is called the initial phenomenon. In the above relationship, the transformation number set can be seen as using the quantum field x in the initial phenomenon 11 、x 21 ,......,x n1 Measuring the field x in the arc phenomenon β 1β 、x 2β ,......,x nβ The obtained number set, the starting phenomenon field can be regarded as a measurement unit field. Based on this, the universal proportional coefficient of each physical parameter of the arc phenomenon β in the arc enthalpy flow physical model can be obtained according to the above relationship.

[0105] In one embodiment, obtaining the universal proportionality coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model according to the relational expression of the complete set of equations, and generating the universal relational expression of the arc behavior under different operating conditions based on the universal proportionality coefficient specifically includes:

[0106] Based on the relationship, a universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained; wherein the physical parameters include arc voltage, arc current, specific enthalpy change, gas density, arc column cross-sectional area, gas flow velocity, gas pressure, conductivity, arc column transverse coordinate, gas constant and temperature;

[0107] Substituting the universal proportionality coefficient of each physical parameter into the equation of the arc enthalpy flow physical model, a universal relational expression of arc behavior under different operating conditions is obtained; wherein the universal relational expression is:

[0108]

[0109] In the formula, c uβ is the transformation multiplier of arc voltage u and arc voltage u in arc phenomenon β; c iβ u is the transformation multiplier between arc current i and arc current i in arc phenomenon β; βc is the ratio of the arc voltage u to the arc voltage u in the arc phenomenon β; i βc is the ratio of arc current i to arc current i in arc phenomenon β; c ρβ is the transformation multiplier between gas density ρ and gas density ρ in arc phenomenon β; c vβ is the transformation multiplier between the gas flow rate v and the gas flow rate v in the arc phenomenon β; c Aβ is the transformation multiplier between the arc column cross-sectional area A and the arc column cross-sectional area A in the arc phenomenon β; c hβ is the conversion multiplier of the specific enthalpy change Δh and the specific enthalpy change Δh in the arc phenomenon β; Δh βc is the ratio of the specific enthalpy change Δh to the specific enthalpy change Δh in the arc phenomenon β; ρ βc is the ratio of the gas density ρ to the gas density ρ in the arc phenomenon β; v βc is the ratio of the gas flow rate v to the gas flow rate v in the arc phenomenon β; σ βc is the ratio of conductivity σ to the conductivity σ in the arc phenomenon β; x βc A is the ratio of the arc column transverse coordinate x to the arc column transverse coordinate x in the arc phenomenon β; βc is the ratio of the arc column cross-sectional area A to the arc column cross-sectional area A in the arc phenomenon β; c pβ is the transformation multiplier between gas pressure p and gas pressure p in arc phenomenon β; c σβ is the conversion multiplier between the conductivity σ and the conductivity σ in the arc phenomenon β; c xβ is the transformation multiplier between the arc column transverse coordinate x and the arc column transverse coordinate x in the arc phenomenon β; p βc is the ratio of gas pressure p to gas pressure p in arc phenomenon β; c Rβ is the transformation multiplier between the gas constant R and the gas constant R in the arc phenomenon β; c Tβ is the conversion multiplier between temperature T and temperature T in arc phenomenon β; R βc is the ratio of the gas constant R to the gas constant R in the arc phenomenon β; T βc It is the ratio of temperature T to temperature T in arc phenomenon β.

[0110] In the embodiment of the present invention, according to x nβ =c nβ x n1 The relationship between can be used to obtain the universal proportional coefficients of various physical parameters in the arc enthalpy flow physical model, specifically:

[0111] uβ =c uβ u βc ;

[0112] i β =c iβ i βc ;

[0113] Δh β =c hβ Δh βc ;

[0114] ρ β =c ρβ ρ βc ;

[0115] A β =c Aβ A βc ;

[0116] v β =c vβ v βc ;

[0117] p β =c pβ p pc ;

[0118] σ β =c σβ σ βc ;

[0119] x β =c xβ x βc ;

[0120] R β =c Rβ R βc ;

[0121] T β =c Tβ T βc ;

[0122] Where, u is the arc voltage; i is the arc current; i is the gas pressure; v is the gas velocity; σ is the conductivity; A is the arc column cross-sectional area; ρ is the gas density; Δh is the specific enthalpy change; x is the arc column transverse coordinate; R is the gas constant; T is the temperature, c uβ 、c iβ , c ρβ 、c Aβ 、c vβ 、c pβ 、c σβ 、c xβ 、c Rβ and cTβ u is the transformation multiplier of each physical parameter in the arc phenomenon β; βc 、i βc , Δh βc , βc , A βc 、v βc 、p pc , σ βc 、x βc , R βc and T βc It is the ratio of various physical parameters in the arc phenomenon β.

[0123] By inserting the above general relationship into the equation of the arc enthalpy flow physical model and rewriting the equation of the arc enthalpy flow physical model, we can get the general relationship expression of the arc behavior under different operating conditions. Based on this general expression, we can deduce the changes in the arc behavior when certain physical parameters change.

[0124] In one embodiment, performing similarity calculation on the general relationship expression and obtaining the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result specifically includes:

[0125] A similarity calculation is performed on the general relational expression to obtain a similarity calculation result; wherein the expression of the similarity calculation result is:

[0126]

[0127] According to the physical characteristics of the arc behavior, some transformation multipliers in the similarity calculation result are assigned, and the assigned result is substituted into the similarity calculation result to obtain the proportional relationship; wherein the expression of the proportional relationship is:

[0128]

[0129] Where k is the proportional factor.

[0130] In the embodiment of the present invention, the proportional relationship between the arc voltage and the gas chamber pressure is obtained by similarity calculation. Specifically, in order for the general relationship expression to hold true, the multiplied coefficient values ​​in front of each equation in the general relationship expression should be equal. In this way, similarity conditions of arc phenomenon β=N phenomena of the same nature can be derived. Based on this, the similarity calculation results of the general relationship expression can be obtained. Furthermore, according to the physical characteristics of the arc behavior, the amplitude of some transformation multipliers in the similarity calculation is adjusted, and the assignment results are substituted into the similarity calculation results. Specifically, the gas pressure p (also called pressure gradient) has a greater impact on the arc, and when the arc enthalpy flow physical model is used for experiments, the original pressure of the upstream cylinder is relatively easy to control. Therefore, when performing similarity analysis, the gas pressure is generally selected as a variable, and only the impact of gas pressure changes on the arc is considered. Suppose c pβ ≠1, c xβ =1, and use this value to derive the proportional factors and c by using the equation derived from similar conditions. pβ The relationship between:

[0131]

[0132] Furthermore, since the conductivity of circuit breakers of the same type is similar, their changes can be basically ignored, so c σβ Assign a value of 1, i.e. c σβ =1, and assign the gas flow rate change to the reference 1, the proportional relationship between the gas pressure and the arc voltage can be obtained, and its expression is as follows:

[0133]

[0134] Right now,

[0135]

[0136] The gas flow rate is essentially determined by the circuit breaker operating mechanism. For the same type of circuit breaker, the gas flow rate caused by its circuit breaker operating mechanism is basically the same, and the difference can be ignored. For different types of circuit breakers, different operating mechanisms will lead to different air flow velocities. The v here is generally considered to be the circuit breaker breaking point speed, generally taking v = 3.5m / s.

[0137] Step 103: Simulate the circuit breaker to be tested, obtain the gas chamber pressure of the circuit breaker to be tested at the current zero point, fit the proportional relationship in combination with the gas chamber pressure and a number of voltage arc-extinction spikes, generate a voltage arc-extinction spike reference value for characterizing the switching state of the circuit breaker to be tested, and generate a breaking evaluation result of the circuit breaker to be tested based on a comparison result between the voltage arc-extinction spike of the circuit breaker to be tested and the voltage arc-extinction spike reference value.

[0138] In one embodiment, the simulation of the circuit breaker to be tested, obtaining the air chamber pressure of the circuit breaker to be tested at the current zero-crossing point, fitting the proportional relationship in combination with the air chamber pressure and a number of voltage arc-extinguishing peaks, and generating a voltage arc-extinguishing peak reference value for characterizing the switch state of the circuit breaker to be tested, specifically includes: obtaining the working parameters of the circuit breaker to be tested, performing arc physical simulation on the circuit breaker to be tested based on the working parameters and an enthalpy flow physical model, and obtaining the air chamber pressure of the circuit breaker at the zero-crossing point; wherein the working parameters include voltage, current, frequency, time constant and phase angle difference; fitting the proportional relationship in combination with a number of voltage arc-extinguishing peaks to obtain a reference value of the proportional factor, and correcting the proportional relationship based on the reference value of the proportional factor to obtain the voltage arc-extinguishing peak reference value; wherein the several voltage arc-extinguishing peaks include a first voltage arc-extinguishing peak corresponding to a successful breaking result of the circuit breaker to be tested and a second voltage arc-extinguishing peak corresponding to a failed breaking result.

[0139] See also Figure 3 , Figure 3 It is a simulation result of the air chamber pressure based on the arc enthalpy flow physical model provided in one embodiment of the present invention. In the embodiment of the present invention, the arc enthalpy flow physical model simulation is used to perform arc physical simulation on the circuit breaker to obtain the air chamber pressure of the circuit breaker to be tested. Specifically, before performing the arc physical simulation of the circuit breaker, it is necessary to first perform detailed physical modeling of the circuit breaker. This includes modeling the geometric structure, material properties, electrical parameters and environmental conditions of the circuit breaker. The input working parameters include voltage, current, frequency, time constant and phase difference. Among them, the voltage is the voltage value when the circuit breaker is in operation; the current is the current value when the circuit breaker is in operation; the frequency is the frequency of the power supply, which is generally 50Hz or 60Hz; the time constant is the time constant of the circuit, which will affect the dynamic behavior of the arc; the phase difference is the phase difference between the voltage and the current, which affects the stability and behavior of the arc. When performing the arc simulation of the circuit breaker, simulation software such as ANSYS CFX, OpenFOAM, PSpice, Simulink, etc. can be used. Establish the geometric model of the circuit breaker and the gas chamber in the simulation software, generate a grid suitable for simulation, and usually need to divide the arc and gas chamber area into high-resolution grids. Then input the working parameters such as voltage, current, frequency, time constant, phase angle difference, etc., select the appropriate enthalpy flow physical model and boundary conditions, run the simulation calculation, and obtain the pressure distribution and arc behavior in the gas chamber. After obtaining the relationship between the gas chamber pressure and the gas chamber pressure, that is, the gas pressure of the circuit breaker to be tested, the value of the unknown value k is obtained by fitting the proportional relationship of a small number of type test voltage arc extinction spikes. The voltage arc extinction spike refers to the short-term high-voltage spike that appears in the voltage at the moment of arc extinction when the circuit breaker type test is performed. See Table 1, which is a parameter data table for a circuit breaker type test provided in an embodiment of the present invention.

[0140] Table 1

[0141]

[0142]

[0143] In the embodiment of the present invention, the voltage arc-extinguishing peaks of successful and failed breaking of the same proportion are substituted into the proportional relationship, the average value of the proportional factor k is taken as the proportional factor reference value, and the proportional factor reference value is re-substituted into the proportional relationship to obtain the voltage arc-extinguishing peak reference value. For the sake of convenience, for example, in this embodiment, the two groups of experimental data numbered A03 and A02 are substituted into the expression of the proportional relationship: Take its average value k=687.919 and substitute it into the expression of proportional relationship again. For the rest of the experimental data, take k687.919 as the value of the proportional factor k in the proportional relationship. Based on the value of the proportional factor, substitute the two groups of experimental data numbered A01 and A02 (experimental data with failed breaking results) into the expression of proportional relationship, which are 749.14V and 784.91V respectively. Take the larger value as the reference value of the voltage arc extinction peak. That is, when the arc extinction peak of the circuit breaker to be tested is less than 784.91V, the breaking fails, and when the arc extinction peak is greater than 820V, the breaking is successful.

[0144] See Table 2, which is a data comparison table of evaluation results and actual breaking results of a circuit breaker breaking result evaluation method provided in an embodiment of the present invention.

[0145] Table 2

[0146]

[0147] Refer to Table 2. According to the proportional factor reference value obtained in Table 1 above, the voltage arc extinction peak reference value of the circuit breaker to be tested under different gas pressures (also called gas chamber pressure) is calculated. The current voltage arc extinction peak of the circuit breaker to be tested is compared with the obtained voltage arc extinction peak reference value to obtain the breaking evaluation result, and the breaking evaluation result is compared with the actual breaking result to verify the accuracy of the circuit breaker breaking result evaluation method provided in the embodiment of the present invention. The evaluation results of B08, B09, and C12 are successful breaking, which is the same as the actual result; the evaluation results of B05, B06, and C10 are failed breaking, which is the same as the actual result.

[0148] In an embodiment of the present invention, a circuit breaker breaking result evaluation device is also provided, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the above-mentioned circuit breaker breaking result evaluation method is implemented.

[0149] In an embodiment of the present invention, a computer-readable storage medium is further provided. The computer-readable storage medium includes a stored computer program. When the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the above-mentioned circuit breaker breaking result evaluation method.

[0150] Exemplarily, the computer program may be divided into one or more modules, one or more modules are stored in a memory and executed by a processor to complete the present invention. One or more modules may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the circuit breaker breaking result evaluation device.

[0151] The circuit breaker breaking result evaluation device can be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The circuit breaker breaking result evaluation device can include, but is not limited to, a processor, a memory, and a display. Those skilled in the art can understand that the above components are only examples of the circuit breaker breaking result evaluation device, and do not constitute a limitation on the circuit breaker breaking result evaluation device, and can include more or less components than the components, or combine certain components, or different components. For example, the circuit breaker breaking result evaluation device can also include input and output devices, network access devices, buses, etc.

[0152] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the circuit breaker breaking result evaluation device, and uses various interfaces and lines to connect various parts of the circuit breaker breaking result evaluation device.

[0153] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the circuit breaker breaking result evaluation device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, a text conversion function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, text message data, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0154] Wherein, if the module based on the evaluation of the breaking result of the circuit breaker is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0155] The embodiment of the present invention provides a method for evaluating the breaking results of a circuit breaker. By performing similarity analysis on the arc enthalpy flow physical model through similarity theory, a universal relational expression can be obtained under different operating conditions, which makes the breaking evaluation method more widely applicable and extrapolable, and can adapt to different circuit breaker models and working conditions. Through similarity calculation, the proportional relationship between the arc voltage and the gas chamber pressure is obtained, and the quantitative evaluation of the arc behavior is realized, which helps to understand and predict the arc characteristics more accurately. Compared with the arc black box model, the analysis through similarity theory simplifies the complexity of model parameter setting and reduces the difficulty of the simulation process. By simulating and obtaining the gas chamber pressure of the circuit breaker to be tested at the current zero crossing point, the dynamic behavior of the circuit breaker can be reflected in real time, providing accurate data support for subsequent evaluation. Furthermore, by fitting and generating the voltage arc extinction peak reference value of the circuit breaker to be tested, a personalized evaluation of the breaking performance of a specific circuit breaker can be realized, avoiding the limitations of the general method. And the breaking evaluation result is generated based on the comparison between the actual voltage arc extinction peak and the reference value, which can reflect the breaking state of the circuit breaker in real time and provide timely feedback for practical applications.

[0156] Example 2

[0157] See also Figure 4 , Figure 4 The module diagram of a circuit breaker breaking result evaluation device provided in one embodiment of the present invention. The present invention provides a circuit breaker breaking result evaluation device, including: a model analysis module 201, a similarity calculation module 202 and a fitting evaluation module 203;

[0158] The model analysis module 201 is used to obtain an arc enthalpy flow physical model, and perform similarity analysis on the arc enthalpy flow physical model based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions; wherein the arc enthalpy flow physical model is used to describe the process from arc generation to arc extinction in a high-voltage circuit breaker;

[0159] The similarity calculation module 202 is used to perform similarity calculation on the general relationship expression, and obtain the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result;

[0160] The fitting evaluation module 203 is used to simulate the circuit breaker to be tested, obtain the gas chamber pressure of the circuit breaker to be tested at the current zero point, fit the proportional relationship in combination with the gas chamber pressure and a number of voltage arc extinction spikes, generate a voltage arc extinction spike reference value for characterizing the switching state of the circuit breaker to be tested, and generate a breaking evaluation result of the circuit breaker to be tested based on the comparison result of the voltage arc extinction spike of the circuit breaker to be tested and the voltage arc extinction spike reference value.

[0161] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0162] In one embodiment, the arc enthalpy flow physical model is subjected to similarity analysis based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions, specifically including:

[0163] Select several arc phenomena with the same properties and divide the arc phenomena into independent variable arc phenomena and dependent variable arc phenomena; wherein the expression of the arc phenomenon is:

[0164] x 1β , x 2β , ..., x nβ (β=1,2,……,n);

[0165] In the formula, β is the phenomenon of arc in a certain state in the high-voltage circuit breaker, and n is the number of selected arc phenomena;

[0166] The arc phenomenon conforms to the complete set of equations; wherein the expression of the complete set of equations is:

[0167] D l (x 1β , x 2β , ..., x nβ )=0(l=1,2,...,m);

[0168] Where D l is a set of matrix equations, l is the number of rows, and m is the number of arc phenomena that are dependent variables in the arc phenomenon;

[0169] According to the relational expression of the complete set of equations, the universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained, and based on the universal proportional coefficient, a universal relational expression of the arc behavior under different operating conditions is generated; wherein the expression of the relational expression is:

[0170] x nβ =c nβ x n1 ;

[0171] In the formula, c nβ is the proportional factor; x n1 It is the quantity field in the initial phenomenon; for the phenomenon of β=1, it is called the initial phenomenon.

[0172] In one embodiment, obtaining the universal proportionality coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model according to the relational expression of the complete set of equations, and generating the universal relational expression of the arc behavior under different operating conditions based on the universal proportionality coefficient specifically includes:

[0173] Based on the relationship, a universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained; wherein the physical parameters include arc voltage, arc current, specific enthalpy change, gas density, arc column cross-sectional area, gas flow velocity, gas pressure, conductivity, arc column transverse coordinate, gas constant and temperature;

[0174] Substituting the universal proportionality coefficient of each physical parameter into the equation of the arc enthalpy flow physical model, a universal relational expression of arc behavior under different operating conditions is obtained; wherein the universal relational expression is:

[0175]

[0176]

[0177] In the formula, c uβ is the transformation multiplier of arc voltage u and arc voltage u in arc phenomenon β; c iβ u is the transformation multiplier between arc current i and arc current i in arc phenomenon β; βc is the ratio of the arc voltage u to the arc voltage u in the arc phenomenon β; i βc is the ratio of arc current i to arc current i in arc phenomenon β; c ρβ is the transformation multiplier between gas density ρ and gas density ρ in arc phenomenon β; c vβ is the transformation multiplier between the gas flow rate v and the gas flow rate v in the arc phenomenon β; c Aβ is the transformation multiplier between the arc column cross-sectional area A and the arc column cross-sectional area A in the arc phenomenon β; c hβ is the conversion multiplier of the specific enthalpy change Δh and the specific enthalpy change Δh in the arc phenomenon β; Δh βc is the ratio of the specific enthalpy change Δh to the specific enthalpy change Δh in the arc phenomenon β; ρ βc is the ratio of the gas density ρ to the gas density ρ in the arc phenomenon β; v βc is the ratio of the gas flow rate v to the gas flow rate v in the arc phenomenon β; σ βc is the ratio of conductivity σ to the conductivity σ in the arc phenomenon β; x βc A is the ratio of the arc column transverse coordinate x to the arc column transverse coordinate x in the arc phenomenon β; βc is the ratio of the arc column cross-sectional area A to the arc column cross-sectional area A in the arc phenomenon β; c pβ is the transformation multiplier between gas pressure p and gas pressure p in arc phenomenon β; cσβ is the conversion multiplier between the conductivity σ and the conductivity σ in the arc phenomenon β; c xβ is the transformation multiplier between the arc column transverse coordinate x and the arc column transverse coordinate x in the arc phenomenon β; p βc is the ratio of gas pressure p to gas pressure p in arc phenomenon β; c Rβ is the transformation multiplier between the gas constant R and the gas constant R in the arc phenomenon β; c Tβ is the conversion multiplier between temperature T and temperature T in arc phenomenon β; R βc is the ratio of the gas constant R to the gas constant R in the arc phenomenon β; T βc It is the ratio of temperature T to temperature T in arc phenomenon β.

[0178] In one embodiment, performing similarity calculation on the general relationship expression and obtaining the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result specifically includes:

[0179] A similarity calculation is performed on the general relational expression to obtain a similarity calculation result; wherein the expression of the similarity calculation result is:

[0180]

[0181]

[0182] According to the physical characteristics of the arc behavior, some transformation multipliers in the similarity calculation result are assigned, and the assigned result is substituted into the similarity calculation result to obtain the proportional relationship; wherein the expression of the proportional relationship is:

[0183]

[0184] Where k is the proportional factor.

[0185] In one embodiment, the circuit breaker to be tested is simulated to obtain the air chamber pressure of the circuit breaker to be tested at the current zero-crossing point, and the proportional relationship is fitted in combination with the air chamber pressure and a plurality of voltage arc-extinguishing peaks to generate a voltage arc-extinguishing peak reference value for characterizing the switch state of the circuit breaker to be tested, specifically including:

[0186] Acquire the working parameters of the circuit breaker to be tested, perform arc physical simulation on the circuit breaker to be tested based on the working parameters and the enthalpy flow physical model, and obtain the air chamber pressure of the circuit breaker at the zero crossing point; wherein the working parameters include voltage, current, frequency, time constant and phase angle difference;

[0187] The proportional relationship is fitted in combination with a plurality of voltage arc-extinction peaks to obtain a reference value of the proportional factor, and the proportional relationship is corrected based on the reference value of the proportional factor to obtain a reference value of the voltage arc-extinction peak; wherein the plurality of voltage arc-extinction peaks include a first voltage arc-extinction peak corresponding to a successful breaking result of the circuit breaker under test and a second voltage arc-extinction peak corresponding to a failed breaking result.

[0188] The embodiment of the present invention provides a circuit breaker breaking result evaluation device. By similarity analysis of the arc enthalpy flow physical model through similarity theory, a universal relational expression can be obtained under different operating conditions, which makes the breaking evaluation method more widely applicable and extrapolable, and can adapt to different circuit breaker models and working conditions. Through similarity calculation, the proportional relationship between the arc voltage and the gas chamber pressure is obtained, and the quantitative evaluation of the arc behavior is realized, which helps to understand and predict the arc characteristics more accurately. Compared with the arc black box model, the analysis through similarity theory simplifies the complexity of model parameter setting and reduces the difficulty of the simulation process. By simulating and obtaining the gas chamber pressure of the circuit breaker to be tested at the current zero crossing point, the dynamic behavior of the circuit breaker can be reflected in real time, providing accurate data support for subsequent evaluation. Furthermore, by fitting and generating the voltage arc extinction peak reference value of the circuit breaker to be tested, a personalized evaluation of the breaking performance of a specific circuit breaker can be realized, avoiding the limitations of the general method. And the breaking evaluation result is generated based on the comparison between the actual voltage arc extinction peak and the reference value, which can reflect the breaking state of the circuit breaker in real time and provide timely feedback for practical applications.

[0189] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for evaluating the breaking result of a circuit breaker, characterized in that: include: Obtaining an arc enthalpy flow physical model, and performing similarity analysis on the arc enthalpy flow physical model based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions; wherein the arc enthalpy flow physical model is used to describe the process from arc generation to arc extinction in a high-voltage circuit breaker; Performing similarity calculation on the general relationship expression, and obtaining the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result; The circuit breaker to be tested is simulated, the air chamber pressure of the circuit breaker to be tested at the current zero point is obtained, the proportional relationship is fitted in combination with the air chamber pressure and a number of voltage arc-extinction spikes, a voltage arc-extinction spike reference value for characterizing the switching state of the circuit breaker to be tested is generated, and a breaking evaluation result of the circuit breaker to be tested is generated based on a comparison result between the voltage arc-extinction spike of the circuit breaker to be tested and the voltage arc-extinction spike reference value.

2. A method for evaluating the breaking result of a circuit breaker according to claim 1, characterized in that: The arc enthalpy flow physical model is subjected to similarity analysis based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions, which specifically includes: Select several arc phenomena with the same properties and divide the arc phenomena into independent variable arc phenomena and dependent variable arc phenomena; wherein the expression of the arc phenomenon is: x 1β ,x 2β ,……,x nβ (β=1,2,……,n); In the formula, β is the phenomenon of arc in a certain state in the high-voltage circuit breaker, and n is the number of selected arc phenomena; The arc phenomenon conforms to the complete set of equations; wherein the expression of the complete set of equations is: D l (x 1β ,x 2β ,……,x nβ )=0(l=1,2,……,m); Where D l is a set of matrix equations, l is the number of rows, and m is the number of arc phenomena that are dependent variables in the arc phenomenon; According to the relational expression of the complete set of equations, the universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained, and based on the universal proportional coefficient, a universal relational expression of the arc behavior under different operating conditions is generated; wherein the expression of the relational expression is: x nβ =c nβ x n1 ; In the formula, c nβ is the proportional factor; x n1 It is the quantity field in the initial phenomenon; for the phenomenon of β=1, it is called the initial phenomenon.

3. A method for evaluating the breaking result of a circuit breaker according to claim 2, characterized in that: The method of obtaining the universal proportionality coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model according to the relational expression of the complete set of equations, and generating the universal relational expression of the arc behavior under different operating conditions based on the universal proportionality coefficient, specifically includes: Based on the relationship, a universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained; wherein the physical parameters include arc voltage, arc current, specific enthalpy change, gas density, arc column cross-sectional area, gas flow velocity, gas pressure, conductivity, arc column transverse coordinate, gas constant and temperature; Substituting the universal proportionality coefficient of each physical parameter into the equation of the arc enthalpy flow physical model, a universal relational expression of arc behavior under different operating conditions is obtained; wherein the universal relational expression is: In the formula, c uβ is the transformation multiplier of arc voltage u and arc voltage u in arc phenomenon β; c iβ uβ is the transformation multiplier between arc current i and arc current i in arc phenomenon β; c is the ratio of the arc voltage u to the arc voltage u in the arc phenomenon β; i βc is the ratio of arc current i to arc current i in arc phenomenon β; c ρβ is the transformation multiplier between gas density ρ and gas density ρ in arc phenomenon β; c vβ is the transformation multiplier between the gas flow rate v and the gas flow rate v in the arc phenomenon β; c Aβ is the transformation multiplier between the arc column cross-sectional area A and the arc column cross-sectional area A in the arc phenomenon β; c hβ is the conversion multiplier of the specific enthalpy change Δh and the specific enthalpy change Δh in the arc phenomenon β; Δh βc is the ratio of the specific enthalpy change Δh to the specific enthalpy change Δh in the arc phenomenon β; ρβ c is the ratio of the gas density ρ to the gas density ρ in the arc phenomenon β; v βc is the ratio of the gas flow rate v to the gas flow rate v in the arc phenomenon β; σ βc is the ratio of conductivity σ to the conductivity σ in the arc phenomenon β; x βc A is the ratio of the arc column transverse coordinate x to the arc column transverse coordinate x in the arc phenomenon β; βc is the ratio of the arc column cross-sectional area A to the arc column cross-sectional area A in the arc phenomenon β; c pβ is the transformation multiplier between gas pressure p and gas pressure p in arc phenomenon β; c σβ is the conversion multiplier between the conductivity σ and the conductivity σ in the arc phenomenon β; c xβ is the transformation multiplier between the arc column transverse coordinate x and the arc column transverse coordinate x in the arc phenomenon β; p βc is the ratio of gas pressure p to gas pressure p in arc phenomenon β; c Rβ is the transformation multiplier between the gas constant R and the gas constant R in the arc phenomenon β; c Tβ is the conversion multiplier between temperature T and temperature T in arc phenomenon β; R βc is the ratio of the gas constant R to the gas constant R in the arc phenomenon β; T βc It is the ratio of temperature T to temperature T in arc phenomenon β.

4. A method for evaluating the breaking result of a circuit breaker according to claim 3, characterized in that: The performing similarity calculation on the general relationship expression and obtaining the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result specifically includes: A similarity calculation is performed on the general relational expression to obtain a similarity calculation result; wherein the expression of the similarity calculation result is: According to the physical characteristics of the arc behavior, some transformation multipliers in the similarity calculation result are assigned, and the assigned result is substituted into the similarity calculation result to obtain the proportional relationship; wherein the expression of the proportional relationship is: Where k is the proportional factor.

5. A method for evaluating the breaking result of a circuit breaker according to claim 1, characterized in that: The method of simulating the circuit breaker to be tested, obtaining the air chamber pressure of the circuit breaker to be tested at the current zero-crossing point, fitting the proportional relationship in combination with the air chamber pressure and a number of voltage arc-extinguishing peaks, and generating a voltage arc-extinguishing peak reference value for characterizing the switch state of the circuit breaker to be tested, specifically includes: Acquire the working parameters of the circuit breaker to be tested, perform arc physical simulation on the circuit breaker to be tested based on the working parameters and the enthalpy flow physical model, and obtain the air chamber pressure of the circuit breaker at the zero crossing point; wherein the working parameters include voltage, current, frequency, time constant and phase angle difference; The proportional relationship is fitted in combination with a plurality of voltage arc-extinction peaks to obtain a reference value of the proportional factor, and the proportional relationship is corrected based on the reference value of the proportional factor to obtain a reference value of the voltage arc-extinction peak; wherein the plurality of voltage arc-extinction peaks include a first voltage arc-extinction peak corresponding to a successful breaking result of the circuit breaker under test and a second voltage arc-extinction peak corresponding to a failed breaking result.

6. A circuit breaker breaking result evaluation device, characterized in that: include: Model analysis module, similarity calculation module and fitting evaluation module; The model analysis module is used to obtain an arc enthalpy flow physical model, and perform similarity analysis on the arc enthalpy flow physical model based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions; wherein the arc enthalpy flow physical model is used to describe the process from arc generation to arc extinction in a high-voltage circuit breaker; The similarity calculation module is used to perform similarity calculation on the general relationship expression, and obtain the proportional relationship between the arc voltage and the gas chamber pressure based on the similarity calculation result; The fitting evaluation module is used to simulate the circuit breaker to be tested, obtain the air chamber pressure of the circuit breaker to be tested at the current zero point, fit the proportional relationship in combination with the air chamber pressure and a number of voltage arc extinction spikes, generate a voltage arc extinction spike reference value for characterizing the switching state of the circuit breaker to be tested, and generate a breaking evaluation result of the circuit breaker to be tested based on a comparison result between the voltage arc extinction spike of the circuit breaker to be tested and the voltage arc extinction spike reference value.

7. A circuit breaker breaking result evaluation device according to claim 6, characterized in that: The arc enthalpy flow physical model is subjected to similarity analysis based on similarity theory to obtain a general relational expression of arc behavior under different operating conditions, which specifically includes: Select several arc phenomena with the same properties and divide the arc phenomena into independent variable arc phenomena and dependent variable arc phenomena; wherein the expression of the arc phenomenon is: x 1β ,x 2β ,……,x nβ (β=1,2,……,n); In the formula, β is the phenomenon of arc in a certain state in the high-voltage circuit breaker, and n is the number of selected arc phenomena; The arc phenomenon conforms to the complete set of equations; wherein the expression of the complete set of equations is: D l (x 1β ,x 2β ,……,x nβ )=0(l=1,2,……,m); Where D l is a set of matrix equations, l is the number of rows, and m is the number of arc phenomena that are dependent variables in the arc phenomenon; According to the relational expression of the complete set of equations, the universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained, and based on the universal proportional coefficient, a universal relational expression of the arc behavior under different operating conditions is generated; wherein the expression of the relational expression is: x nβ =c nβ x n1 ; In the formula, c nβ is the proportional factor; x n1 It is the quantity field in the initial phenomenon; for the phenomenon of β=1, it is called the initial phenomenon.

8. A circuit breaker breaking result evaluation device according to claim 7, characterized in that: The method of obtaining the universal proportionality coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model according to the relational expression of the complete set of equations, and generating the universal relational expression of the arc behavior under different operating conditions based on the universal proportionality coefficient, specifically includes: Based on the relationship, a universal proportional coefficient of each physical parameter of the arc phenomenon in the arc enthalpy flow physical model is obtained; wherein the physical parameters include arc voltage, arc current, specific enthalpy change, gas density, arc column cross-sectional area, gas flow velocity, gas pressure, conductivity, arc column transverse coordinate, gas constant and temperature; Substituting the universal proportionality coefficient of each physical parameter into the equation of the arc enthalpy flow physical model, a universal relational expression of arc behavior under different operating conditions is obtained; wherein the universal relational expression is: In the formula, c uβ is the transformation multiplier of arc voltage u and arc voltage u in arc phenomenon β; c iβ u is the transformation multiplier between arc current i and arc current i in arc phenomenon β; βc is the ratio of the arc voltage u to the arc voltage u in the arc phenomenon β; i βc is the ratio of arc current i to arc current i in arc phenomenon β; c ρβ is the transformation multiplier between gas density ρ and gas density ρ in arc phenomenon β; c vβ is the transformation multiplier between the gas flow rate v and the gas flow rate v in the arc phenomenon β; c Aβ is the transformation multiplier between the arc column cross-sectional area A and the arc column cross-sectional area A in the arc phenomenon β; c hβ is the conversion multiplier of the specific enthalpy change Δh and the specific enthalpy change Δh in the arc phenomenon β; Δh βc is the ratio of the specific enthalpy change Δh to the specific enthalpy change Δh in the arc phenomenon β; ρβ c is the ratio of the gas density ρ to the gas density ρ in the arc phenomenon β; v βc is the ratio of the gas flow rate v to the gas flow rate v in the arc phenomenon β; σ βc is the ratio of conductivity σ to the conductivity σ in the arc phenomenon β; x βc A is the ratio of the arc column transverse coordinate x to the arc column transverse coordinate x in the arc phenomenon β; βc is the ratio of the arc column cross-sectional area A to the arc column cross-sectional area A in the arc phenomenon β; c pβ is the transformation multiplier between gas pressure p and gas pressure p in arc phenomenon β; c σβ is the conversion multiplier between the conductivity σ and the conductivity σ in the arc phenomenon β; c xβ is the transformation multiplier between the arc column transverse coordinate x and the arc column transverse coordinate x in the arc phenomenon β; p βc is the ratio of gas pressure p to gas pressure p in arc phenomenon β; c Rβ is the transformation multiplier between the gas constant R and the gas constant R in the arc phenomenon β; c Tβ is the conversion multiplier between temperature T and temperature T in arc phenomenon β; R βc is the ratio of the gas constant R to the gas constant R in the arc phenomenon β; T βc It is the ratio of temperature T to temperature T in arc phenomenon β.

9. A terminal device, characterized in that: The invention comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the circuit breaker breaking result evaluation method as claimed in any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the circuit breaker breaking result evaluation method according to any one of claims 1 to 5.

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