CN112578275A - Method and system for detecting thermal performance of low-voltage circuit breaker in high-altitude environment - Google Patents
Method and system for detecting thermal performance of low-voltage circuit breaker in high-altitude environment Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting the thermal performance of a low-voltage circuit breaker in a high-altitude environment, wherein the method comprises the following steps: establishing an initial low-voltage circuit breaker simulation model, and acquiring initial temperature simulation values of low-voltage circuit breakers of different models under different environmental parameters; respectively carrying out temperature rise tests on low-voltage circuit breakers of different models, and correcting the simulation model of the low-voltage circuit breaker according to test results; determining a temperature rise reference value according to temperature rise data of the low-voltage circuit breaker under standard environmental parameters; determining a temperature rise simulation value of a low-voltage circuit breaker to be detected under a preset high-altitude environment parameter, and determining a temperature rise correction value according to a difference value of the temperature rise simulation value and a temperature rise reference value; the method comprises the steps of carrying out temperature rise test on a low-voltage circuit breaker to be detected under standard environmental parameters to obtain a temperature rise test value, determining a temperature rise calculation value of the low-voltage circuit breaker to be detected under the high-altitude environmental parameters according to the sum of the temperature rise test value and a temperature rise correction value, and determining a detection result under the high-altitude environment according to the temperature rise calculation value.
Description
Technical Field
The invention relates to the technical field of detection of low-voltage circuit breakers, in particular to a method and a system for detecting the thermal performance of a low-voltage circuit breaker in a high-altitude environment.
Background
With the rise of the altitude, the environmental parameters can be obviously changed, and the air in the high-altitude area is thin, the air pressure is low, the humidity is low, and the temperature is low. When the power equipment in plain areas is applied to high-altitude environments, the electrical performance can be obviously changed, and faults and accidents are easily caused. The western high-altitude area (the area of more than 2000 meters) of China occupies more than 35% of the territorial area, so that the influence of the high-altitude environment on the performance of power equipment is very necessary to be researched.
Low-voltage circuit breakers are key devices in power distribution networks, and their performance is directly related to power distribution safety and reliability. GB 14048.2-2008 "low-voltage switchgear and control device part 2: the circuit breaker provides that the temperature rise of a circuit breaker terminal cannot exceed 80K, and the temperature rise of an accessible external component cannot exceed 50K, and the previous research shows that the temperature rise of the circuit breaker can be correspondingly increased by 0.4K due to the fact that the air density is reduced and the heat dissipation capacity is weakened when the altitude is increased by 100m, and the operation condition of the low-voltage circuit breaker is obviously worsened. For areas with altitude above 4000m, the temperature rise will increase significantly.
At present, the detection of the thermal performance of the low-voltage circuit breaker in the high-altitude environment is only limited to empirical data obtained by tests, the influence of the high-altitude environment on the thermal performance of the low-voltage circuit breaker is not deeply analyzed from the aspect of heat transfer, and the detection is not accurate enough. In addition, the influence of the high-altitude environment on the thermal performance of the low-voltage circuit breaker can not be accurately detected in different areas at the same altitude without analyzing the influence caused by changes of air pressure, temperature and humidity one by one.
Disclosure of Invention
The invention provides a method and a system for detecting the thermal performance of a low-voltage circuit breaker in a high-altitude environment, which are used for solving the problem of how to detect the thermal performance of the low-voltage circuit breaker in high-altitude environment parameters.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for detecting thermal performance of a low-voltage circuit breaker in a high-altitude environment, the method including:
establishing an initial low-voltage circuit breaker simulation model, calculating air heat convection coefficients of low-voltage circuit breakers of different models under different environmental parameters, and simulating by using the initial low-voltage circuit breaker simulation model to obtain initial temperature simulation values of the low-voltage circuit breakers of different models under different environmental parameters; wherein the environmental parameters include: air pressure, temperature and humidity;
respectively carrying out temperature rise tests on low-voltage circuit breakers of different models under different environmental parameters, respectively acquiring temperature rise data of actual in-out terminals and shells of the low-voltage circuit breakers of different models, and correcting the low-voltage circuit breaker simulation model according to the acquired temperature rise data of the actual in-out terminals and shells of the low-voltage circuit breakers of different models and the initial temperature simulation value to acquire a corrected low-voltage circuit breaker simulation model;
respectively carrying out temperature rise tests on low-voltage circuit breakers of different models under standard environmental parameters, and determining a temperature rise reference value according to temperature rise data of the low-voltage circuit breakers of different models under the standard environmental parameters;
determining a temperature rise simulation value of the low-voltage circuit breaker to be detected under a preset high-altitude environment parameter by using the corrected low-voltage circuit breaker simulation model, and determining a temperature rise correction value according to a difference value of the temperature rise simulation value and a temperature rise reference value;
the method comprises the steps of carrying out a temperature rise test on a low-voltage circuit breaker to be detected under standard environmental parameters to obtain a temperature rise test value, determining a temperature rise calculation value of the low-voltage circuit breaker to be detected under a preset high-altitude environmental parameter according to the sum of the temperature rise test value and a temperature rise correction value, and determining a detection result of the low-voltage circuit breaker to be detected under the high-altitude environment according to the temperature rise calculation value.
Preferably, wherein the low voltage circuit breaker simulation model comprises: a conductive loop, an interior atmosphere, and a housing, the conductive loop comprising: the device comprises a wire inlet end, a wire outlet end, a bimetallic strip, a moving contact, a static contact, a coil, a flexible connection, an iron yoke, an arc striking piece and a contact resistor.
Preferably, the calculating of the air thermal convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters includes:
according to the structural material parameters of the low-voltage circuit breaker, the air heat convection coefficient of the low-voltage circuit breaker of each model at different moments under different environmental parameters is calculated based on the following formula, and the method comprises the following steps:
Nu＝C(GrPr)n (2)
the method comprises the following steps of (1) utilizing a formula (1) and (2) utilizing a formula (2) to simultaneously solve and obtain air thermal convection coefficients h at different moments under different environmental parameters; determining the Gr and Pr of Gravax number by using the formula (3) and the formula (4); nu is Nusselqizi number, n is coefficient, C is constant, g is gravity acceleration, alphaVIs the coefficient of volume expansion, τtThe temperature rise at the time t, l is the characteristic length of the heating element, v is the kinematic viscosity of air, eta is the dynamic viscosity of air, cpIs the specific heat capacity of air, and lambda is the thermal conductivity of air;
and respectively carrying out iterative solution on the air heat convection coefficients of the low-voltage circuit breakers of the same model at different times under different environmental parameters to obtain stable values of the air heat convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters.
Preferably, wherein the method further comprises:
the method comprises the steps of determining temperature rise simulation values of low-voltage circuit breakers of different models under different high-altitude environment parameters by using a corrected low-voltage circuit breaker simulation model, determining temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters according to a difference value of the temperature rise simulation values and a temperature rise reference value, and determining a temperature rise correction value table according to the obtained temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters.
Preferably, the determining the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment according to the calculated temperature rise value includes:
if the calculated temperature rise value is less than or equal to the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is qualified;
and if the calculated temperature rise value is larger than the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is unqualified.
According to another aspect of the present invention, there is provided a thermal performance detection system for a low-voltage circuit breaker in a high altitude environment, the system comprising:
the simulation unit is used for establishing an initial low-voltage circuit breaker simulation model, calculating air heat convection coefficients of low-voltage circuit breakers of different models under different environmental parameters, and simulating by using the initial low-voltage circuit breaker simulation model to obtain initial temperature simulation values of the low-voltage circuit breakers of different models under different environmental parameters; wherein the environmental parameters include: air pressure, temperature and humidity;
the low-voltage circuit breaker simulation model correcting unit is used for respectively carrying out temperature rise tests on low-voltage circuit breakers of different models under different environmental parameters, respectively acquiring temperature rise data of actual wire inlet and outlet terminals and shells of the low-voltage circuit breakers of different models, and correcting the low-voltage circuit breaker simulation model according to the acquired temperature rise data of the actual wire inlet and outlet terminals and shells of the low-voltage circuit breakers of different models and the initial temperature simulation value to acquire a corrected low-voltage circuit breaker simulation model;
the temperature rise reference value acquisition unit is used for respectively carrying out temperature rise tests on the low-voltage circuit breakers of different models under the standard environmental parameters and determining the temperature rise reference value according to the temperature rise data of the low-voltage circuit breakers of different models under the standard environmental parameters;
the temperature rise correction value acquisition unit is used for determining a temperature rise simulation value of the low-voltage circuit breaker to be detected under a preset high-altitude environment parameter by using the corrected low-voltage circuit breaker simulation model and determining a temperature rise correction value according to a difference value of the temperature rise simulation value and a temperature rise reference value;
the detection result determining unit is used for carrying out a temperature rise test on the low-voltage circuit breaker to be detected under the standard environmental parameters so as to obtain a temperature rise test value, determining a temperature rise calculation value of the low-voltage circuit breaker to be detected under the preset high-altitude environmental parameters according to the sum of the temperature rise test value and the temperature rise correction value, and determining a detection result of the low-voltage circuit breaker to be detected under the high-altitude environment according to the temperature rise calculation value.
Preferably, wherein the low voltage circuit breaker simulation model comprises: a conductive loop, an interior atmosphere, and a housing, the conductive loop comprising: the device comprises a wire inlet end, a wire outlet end, a bimetallic strip, a moving contact, a static contact, a coil, a flexible connection, an iron yoke, an arc striking piece and a contact resistor.
Preferably, the initial temperature simulation value determining unit calculates air thermal convection coefficients of different types of low-voltage circuit breakers under different environmental parameters, and includes:
according to the structural material parameters of the low-voltage circuit breaker, the air heat convection coefficient of the low-voltage circuit breaker of each model at different moments under different environmental parameters is calculated based on the following formula, and the method comprises the following steps:
Nu＝C(GrPr)n (2)
the method comprises the following steps of (1) utilizing a formula (1) and (2) utilizing a formula (2) to simultaneously solve and obtain air thermal convection coefficients h at different moments under different environmental parameters; determining the Gr and Pr of Gravax number by using the formula (3) and the formula (4); nu is Nusselqizi number, n is coefficient, C is constant, g is gravity acceleration, alphaVIs the coefficient of volume expansion, τtThe temperature rise at the time t, l is the characteristic length of the heating element, v is the kinematic viscosity of air, eta is the dynamic viscosity of air, cpIs the specific heat capacity of air, and lambda is the thermal conductivity of air;
and respectively carrying out iterative solution on the air heat convection coefficients of the low-voltage circuit breakers of the same model at different times under different environmental parameters to obtain stable values of the air heat convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters.
Preferably, wherein the system further comprises:
and the temperature rise correction value table determining unit is used for determining temperature rise simulation values of the low-voltage circuit breakers of different models under different high-altitude environment parameters by using the corrected low-voltage circuit breaker simulation model, determining temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters according to the difference value of the temperature rise simulation values and the temperature rise reference value, and determining the temperature rise correction value table according to the obtained temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters.
Preferably, the determining unit of the detection result determines the detection result of the low-voltage circuit breaker to be detected in the high altitude environment according to the calculated temperature rise value, and includes:
if the calculated temperature rise value is less than or equal to the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is qualified;
and if the calculated temperature rise value is larger than the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is unqualified.
The invention provides a method and a system for detecting the thermal performance of a low-voltage circuit breaker in a high-altitude environment, which are used for detecting the influence of different environmental parameters on the thermal performance of the low-voltage circuit breaker from the aspect of heat transfer by comprehensive simulation analysis and temperature rise test and accurately analyzing the environmental action of different areas at the same altitude; the temperature rise correction value obtained by the invention can provide a detection means for the high altitude adaptability of the thermal performance of the circuit breaker in plain areas; the method and the device can provide technical support for researching sensitive parameters for improving the thermal performance of the low-voltage circuit breaker, optimizing the design of the low-voltage circuit breaker in future so as to improve the high-altitude adaptability of the low-voltage circuit breaker, and simultaneously provide technical support for bidding purchase, use, updating and upgrading of the low-voltage circuit breaker.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow chart of a method 100 for thermal performance testing of a low-voltage circuit breaker in a high-altitude environment according to an embodiment of the invention;
fig. 2 is a schematic view of an internal conductive circuit of a low-voltage circuit breaker according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a thermal performance detection system 300 for a low-voltage circuit breaker in a high-altitude environment according to an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method 100 for detecting thermal performance of a low-voltage circuit breaker in a high-altitude environment according to an embodiment of the present invention. As shown in fig. 1, in the method for detecting the thermal performance of the low-voltage circuit breaker in the high-altitude environment provided by the embodiment of the invention, the influence of different environmental parameters on the thermal performance of the low-voltage circuit breaker is detected from the heat transfer aspect through comprehensive simulation analysis and a temperature rise test, and the environmental effects of the same altitude and different areas are accurately analyzed; the temperature rise correction value obtained by the invention can provide a detection means for the high altitude adaptability of the thermal performance of the circuit breaker in plain areas; the method and the device can provide technical support for researching sensitive parameters for improving the thermal performance of the low-voltage circuit breaker, optimizing the design of the low-voltage circuit breaker in future so as to improve the high-altitude adaptability of the low-voltage circuit breaker, and simultaneously provide technical support for bidding purchase, use, updating and upgrading of the low-voltage circuit breaker. The method 100 for detecting the thermal performance of the low-voltage circuit breaker in the high-altitude environment, provided by the embodiment of the invention, comprises the steps of starting from step 101, establishing an initial low-voltage circuit breaker simulation model in step 101, calculating air thermal convection coefficients of low-voltage circuit breakers of different models under different environmental parameters, and simulating by using the initial low-voltage circuit breaker simulation model to obtain initial temperature simulation values of the low-voltage circuit breakers of different models under different environmental parameters; wherein the environmental parameters include: air pressure, temperature and humidity.
Preferably, wherein the low voltage circuit breaker simulation model comprises: a conductive loop, an interior atmosphere, and a housing, the conductive loop comprising: the device comprises a wire inlet end, a wire outlet end, a bimetallic strip, a moving contact, a static contact, a coil, a flexible connection, an iron yoke, an arc striking piece and a contact resistor.
Preferably, the calculating of the air thermal convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters includes:
according to the structural material parameters of the low-voltage circuit breaker, the air heat convection coefficient of the low-voltage circuit breaker of each model at different moments under different environmental parameters is calculated based on the following formula, and the method comprises the following steps:
Nu＝C(GrPr)n (2)
the method comprises the following steps of (1) utilizing a formula (1) and (2) utilizing a formula (2) to simultaneously solve and obtain air thermal convection coefficients h at different moments under different environmental parameters; determining the Gr and Pr of Gravax number by using the formula (3) and the formula (4); nu is Nusselqizi number, n is coefficient, C is constant, g is gravity acceleration, alphaVIs the coefficient of volume expansion, τtThe temperature rise at the time t, l is the characteristic length of the heating element, v is the kinematic viscosity of air, eta is the dynamic viscosity of air, cpIs the specific heat capacity of air, and lambda is the thermal conductivity of air;
and respectively carrying out iterative solution on the air heat convection coefficients of the low-voltage circuit breakers of the same model at different times under different environmental parameters to obtain stable values of the air heat convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters.
The low-voltage circuit breaker operates in a high-altitude area, and the comprehensive action thermal performance of the low-voltage circuit breaker under different environmental parameters can be obviously changed. Therefore, the embodiment of the invention combines finite element simulation and temperature rise tests under different environmental parameters, analyzes the influence of changes of air pressure, temperature and humidity of high-altitude areas on the thermal performance of the low-voltage circuit breaker one by one from the aspect of heat transfer, and has an important role in accurately analyzing the changes of the thermal performance of the low-voltage circuit breaker in different areas at the same altitude and detecting whether the low-voltage circuit breaker can adapt to the high-altitude environment.
In the embodiment of the invention, a simulation model of the low-voltage circuit breaker is established in three-dimensional modeling software, the simulation model comprises an internal conductive loop, air and a shell, as shown in fig. 2, the conductive loop comprises an incoming and outgoing line end, a bimetallic strip, a contact, a cylindrical contact resistor, a flexible connection, an iron yoke, an arc striking sheet and a coil, the size of an equivalent cylinder of the contact resistor is determined by the size of the contact resistor, and the other parts in the low-voltage circuit breaker are equivalent to the air with comprehensive heat conductivity coefficient.
The low-voltage circuit breaker is narrow in internal space, slow in air flow and only hundreds of degrees centigrade in temperature, so that heat conduction is only considered in the low-voltage circuit breaker, air heat convection is only considered in the low-voltage circuit breaker, the influence of high-altitude environment on the heat performance of the low-voltage circuit breaker is reflected on the change of the heat convection state, air heat convection coefficients under different environment parameters are calculated, and the air heat convection coefficients are substituted into a simulation model to solve to obtain a temperature rise distribution result. After the coplanar cube is bonded, the grids are divided, and boundary conditions are loaded and set in sequence, the breaker model is solved to obtain temperature rise distribution. And respectively carrying out iterative solution on the air heat convection coefficients of the low-voltage circuit breakers of the same model at different times under different environmental parameters by using the established low-voltage circuit breaker simulation model so as to obtain stable values of the air heat convection coefficients of the low-voltage circuit breakers of each model under different environmental parameters. Wherein the environmental parameters include: air pressure, temperature and humidity; the air pressure range is 50kPa-101.3kPa, the temperature range is 0 ℃ -40 ℃, and the relative humidity range is 20% -95%.
In the invention, for any type of low-voltage circuit breaker, the voltage of the end face of a coupling incoming line is coupled, a rated current is applied to one point on a selected surface, and when a third boundary condition is set, the thermal convection coefficients of different surfaces of a shell of the circuit breaker are solved, and the Grafaff number Gr and the Prandtl number Pr are solved through the expressions (3) and (4).
Wherein g is gravity acceleration and volume expansion coefficient alphaV，τtThe temperature rise at the time t, i is the characteristic length of the heating element, v is the kinematic viscosity of air, and the dynamic viscosity of air is eta, cpIs the specific heat capacity of air, and λ is the thermal conductivity of air.
The change of air pressure, temperature and humidity can affect the aerodynamic viscosity, the change of temperature also affects the volume expansion coefficient, the air kinematic viscosity and the heat conductivity, Gr and Pr corresponding to environmental parameters are calculated, then the formula (1) and the formula (2) are replaced to be simultaneously solved to obtain the heat convection coefficient h of different surfaces of the low-voltage circuit breaker of the type, and the heat convection coefficient boundary condition is input to solve the steady-state temperature distribution of the circuit breaker. The formula (1) and the formula (2) are as follows.
Nu＝C(GrPr)n (2)
Where Nu is Nu saier number, h is thermal convection coefficient, l is characteristic length of the heating element, λ is thermal conductivity of air, C is constant, Gr is gladaff number, Pr is prandtl number, and n is coefficient.
In step 102, temperature rise tests are respectively carried out on the low-voltage circuit breakers of different models under different environmental parameters, temperature rise data of actual in-out terminals and shells of the low-voltage circuit breakers of different models are respectively obtained, and the low-voltage circuit breaker simulation model is corrected according to the obtained temperature rise data of the actual in-out terminals and shells of the low-voltage circuit breakers of different models and the initial temperature simulation value so as to obtain a corrected low-voltage circuit breaker simulation model.
In the embodiment of the invention, different air pressure, temperature and humidity conditions are set in the environment test box, a temperature rise test of the low-voltage circuit breaker is carried out, and a thermocouple or an infrared sensor is adopted to measure the temperature of the wire inlet and outlet terminal and the temperature of the shell. And correcting the low-voltage circuit breaker simulation model according to the obtained actual temperature rise data and the initial temperature simulation value, correcting the model parameters, and obtaining the corrected low-voltage circuit breaker simulation model.
In step 103, temperature rise tests are respectively performed on the low-voltage circuit breakers of different models under the standard environmental parameters, and a temperature rise reference value is determined according to temperature rise data of the low-voltage circuit breakers of different models under the standard environmental parameters.
In step 104, a temperature rise simulation value of the low-voltage circuit breaker to be detected under a preset high-altitude environment parameter is determined by using the corrected low-voltage circuit breaker simulation model, and a temperature rise correction value is determined according to a difference value of the temperature rise simulation value and a temperature rise reference value.
In step 105, a temperature rise test is performed on the low-voltage circuit breaker to be detected under the standard environmental parameters to obtain a temperature rise test value, a temperature rise calculation value of the low-voltage circuit breaker to be detected under the preset high-altitude environmental parameters is determined according to the sum of the temperature rise test value and the temperature rise correction value, and a detection result of the low-voltage circuit breaker to be detected under the high-altitude environment is determined according to the temperature rise calculation value.
Preferably, wherein the method further comprises:
the method comprises the steps of determining temperature rise simulation values of low-voltage circuit breakers of different models under different high-altitude environment parameters by using a corrected low-voltage circuit breaker simulation model, determining temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters according to a difference value of the temperature rise simulation values and a temperature rise reference value, and determining a temperature rise correction value table according to the obtained temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters.
Preferably, the determining the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment according to the calculated temperature rise value includes:
if the calculated temperature rise value is less than or equal to the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is qualified;
and if the calculated temperature rise value is larger than the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is unqualified.
In the embodiment of the invention, the temperature rise reference values of different models are determined according to the average value of the temperature rise test results of a plurality of low-voltage circuit breakers of different models under the standard environmental parameter A1, the difference value between the model simulation result and the temperature rise reference value obtained by using the corrected low-voltage circuit breaker simulation model under different environmental parameters is respectively calculated, the difference value is used as the temperature rise correction value of the low-voltage circuit breakers of different models under different high-altitude environmental parameters, and the temperature rise correction value delta tau table is established according to the temperature rise correction value corresponding to the high-altitude typical environmental parameter.
Wherein, when the high-altitude environment parameter A2 of the pre-operation of a certain type of circuit breaker is in the given typical environment parameter table,firstly, according to the model and the environmental parameters of pre-operation, determining the corrected value delta tau of temperature rise1(ii) a And then carrying out temperature rise test on the low-voltage circuit breaker to be detected under the standard environmental parameter A1 to obtain a temperature rise test value tau1(ii) a Then determining a temperature rise calculation value (tau) of the low-voltage circuit breaker of the type under the pre-operation high-altitude environmental parameter according to the sum of the temperature rise test value and the temperature rise correction value1+△τ1) (ii) a And finally, determining whether the low-voltage circuit breaker of the type is suitable for running in a high-altitude environment or not according to the calculated temperature rise value.
When the high-altitude environment parameter A2 of the pre-operation of a circuit breaker of a certain model is not in the given typical environment parameter table, firstly, a temperature rise simulation value under the high-altitude environment parameter of the pre-operation is obtained according to the corrected simulation model, and a corresponding temperature rise correction value delta tau is determined according to the difference between the temperature rise simulation value and a temperature rise reference value1(ii) a Then, performing a temperature rise test on the low-voltage circuit breaker to be detected under standard environmental parameters to obtain a temperature rise test value tau 1; then determining a temperature rise calculation value (tau) of the low-voltage circuit breaker of the type under the pre-operation high-altitude environmental parameter according to the sum of the temperature rise test value and the temperature rise correction value1+△τ1) (ii) a And finally, determining whether the low-voltage circuit breaker of the type is suitable for running in a high-altitude environment or not according to the calculated temperature rise value.
The method can solve the problems that the current means for detecting the influence of the high-altitude environment on the thermal performance of the low-voltage circuit breaker is mainly experiments, only the altitude is considered, the influence of deep analysis of environmental parameters from the aspect of heat transfer is avoided, the environmental parameters of different areas at the same altitude are different, and the accurate detection of the environmental influence and the adaptability is difficult to realize.
The method of the invention explores the single influence and the comprehensive influence of the changes of air pressure, temperature and humidity on the thermal performance of the low-voltage circuit breaker one by one from the aspect of heat transfer, thereby accurately reflecting the environmental action of different areas at the same altitude, establishing a model for exploring the influence of the thermal performance of the low-voltage circuit breaker by the high altitude environment, analyzing the influence of the changes of environmental parameters on the thermal performance of the circuit breaker from the aspect of heat transfer, and being beneficial to deeply analyzing the effect of the environment on the performance of the circuit breaker; a research experiment of single action and comprehensive action of different environmental parameters in a high-altitude area is designed, the action of the high-altitude environment on the thermal performance of the circuit breaker is accurately reflected, and the detection accuracy of the influence of the high-altitude environment on the thermal performance is improved; the temperature rise correction value table obtained by combining simulation and test can cover the living area of people in China, is high in accuracy, and is beneficial to detecting the high-altitude adaptability of the circuit breaker in a standard laboratory in plain areas.
Fig. 3 is a schematic structural diagram of a thermal performance detection system 300 for a low-voltage circuit breaker in a high-altitude environment according to an embodiment of the invention. As shown in fig. 3, the thermal performance detection system 300 for a low-voltage circuit breaker in a high-altitude environment according to an embodiment of the present invention includes: the circuit breaker simulation test system comprises a simulation unit 301, a low-voltage circuit breaker simulation model correction unit 302, a temperature rise reference value acquisition unit 303, a temperature rise correction value acquisition unit 304 and a detection result determination unit 305.
Preferably, the initial temperature simulation value obtaining unit 301 is configured to establish an initial low-voltage circuit breaker simulation model, calculate air heat convection coefficients of low-voltage circuit breakers of different models under different environmental parameters, and obtain initial temperature simulation values of low-voltage circuit breakers of different models under different environmental parameters by using the initial low-voltage circuit breaker simulation model; wherein the environmental parameters include: air pressure, temperature and humidity.
Preferably, wherein the low voltage circuit breaker simulation model comprises: a conductive loop, an interior atmosphere, and a housing, the conductive loop comprising: the device comprises a wire inlet end, a wire outlet end, a bimetallic strip, a moving contact, a static contact, a coil, a flexible connection, an iron yoke, an arc striking piece and a contact resistor.
Preferably, the initial temperature simulation value determining unit 301 calculates air thermal convection coefficients of different types of low-voltage circuit breakers under different environmental parameters, including:
according to the structural material parameters of the low-voltage circuit breaker, the air heat convection coefficient of the low-voltage circuit breaker of each model at different moments under different environmental parameters is calculated based on the following formula, and the method comprises the following steps:
Nu＝C(GrPr)n (2)
the method comprises the following steps of (1) utilizing a formula (1) and (2) utilizing a formula (2) to simultaneously solve and obtain air thermal convection coefficients h at different moments under different environmental parameters; determining the Gr and Pr of Gravax number by using the formula (3) and the formula (4); nu is Nusselqizi number, n is coefficient, C is constant, g is gravity acceleration, alphaVIs the coefficient of volume expansion, τtThe temperature rise at the time t, l is the characteristic length of the heating element, v is the kinematic viscosity of air, eta is the dynamic viscosity of air, cpIs the specific heat capacity of air, and lambda is the thermal conductivity of air;
and respectively carrying out iterative solution on the air heat convection coefficients of the low-voltage circuit breakers of the same model at different times under different environmental parameters to obtain stable values of the air heat convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters.
Preferably, the low-voltage circuit breaker simulation model modification unit 302 is configured to perform a temperature rise test on the low-voltage circuit breakers of different models respectively under different environmental parameters, acquire temperature rise data of the actual incoming and outgoing line terminals and the actual shell of the low-voltage circuit breakers of different models respectively, modify the low-voltage circuit breaker simulation model according to the acquired temperature rise data of the actual incoming and outgoing line terminals and the actual shell of the low-voltage circuit breakers of different models and the initial temperature simulation value, and acquire the modified low-voltage circuit breaker simulation model.
Preferably, the temperature rise reference value obtaining unit 303 is configured to perform a temperature rise test on the low-voltage circuit breakers of different models respectively under the standard environmental parameter, and determine the temperature rise reference value according to the temperature rise data of the low-voltage circuit breakers of different models under the standard environmental parameter.
Preferably, the temperature rise correction value obtaining unit 304 is configured to determine a temperature rise simulation value of the low-voltage circuit breaker to be detected under a preset high-altitude environment parameter by using the corrected low-voltage circuit breaker simulation model, and determine the temperature rise correction value according to a difference between the temperature rise simulation value and the temperature rise reference value.
Preferably, the detection result determining unit 305 is configured to perform a temperature rise test on the low-voltage circuit breaker to be detected under the standard environmental parameter to obtain a temperature rise test value, determine a temperature rise calculated value of the low-voltage circuit breaker to be detected under the preset high-altitude environmental parameter according to a sum of the temperature rise test value and the temperature rise correction value, and determine a detection result of the low-voltage circuit breaker to be detected under the high-altitude environment according to the temperature rise calculated value.
Preferably, wherein the system further comprises:
and the temperature rise correction value table determining unit is used for determining temperature rise simulation values of the low-voltage circuit breakers of different models under different high-altitude environment parameters by using the corrected low-voltage circuit breaker simulation model, determining temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters according to the difference value of the temperature rise simulation values and the temperature rise reference value, and determining the temperature rise correction value table according to the obtained temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters.
Preferably, the detecting result determining unit 305 determines the detecting result of the low-voltage circuit breaker to be detected in the high-altitude environment according to the calculated temperature rise value, and includes:
if the calculated temperature rise value is less than or equal to the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is qualified;
and if the calculated temperature rise value is larger than the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is unqualified.
The system 300 for detecting the thermal performance of the low-voltage circuit breaker in the high-altitude environment according to the embodiment of the present invention corresponds to the method 100 for detecting the thermal performance of the low-voltage circuit breaker in the high-altitude environment according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for detecting the thermal performance of a low-voltage circuit breaker in a high-altitude environment is characterized by comprising the following steps:
establishing an initial low-voltage circuit breaker simulation model, calculating air heat convection coefficients of low-voltage circuit breakers of different models under different environmental parameters, and simulating by using the initial low-voltage circuit breaker simulation model to obtain initial temperature simulation values of the low-voltage circuit breakers of different models under different environmental parameters; wherein the environmental parameters include: air pressure, temperature and humidity;
respectively carrying out temperature rise tests on low-voltage circuit breakers of different models under different environmental parameters, respectively acquiring temperature rise data of actual in-out terminals and shells of the low-voltage circuit breakers of different models, and correcting the low-voltage circuit breaker simulation model according to the acquired temperature rise data of the actual in-out terminals and shells of the low-voltage circuit breakers of different models and the initial temperature simulation value to acquire a corrected low-voltage circuit breaker simulation model;
respectively carrying out temperature rise tests on low-voltage circuit breakers of different models under standard environmental parameters, and determining a temperature rise reference value according to temperature rise data of the low-voltage circuit breakers of different models under the standard environmental parameters;
determining a temperature rise simulation value of the low-voltage circuit breaker to be detected under a preset high-altitude environment parameter by using the corrected low-voltage circuit breaker simulation model, and determining a temperature rise correction value according to a difference value of the temperature rise simulation value and a temperature rise reference value;
the method comprises the steps of carrying out a temperature rise test on a low-voltage circuit breaker to be detected under standard environmental parameters to obtain a temperature rise test value, determining a temperature rise calculation value of the low-voltage circuit breaker to be detected under a preset high-altitude environmental parameter according to the sum of the temperature rise test value and a temperature rise correction value, and determining a detection result of the low-voltage circuit breaker to be detected under the high-altitude environment according to the temperature rise calculation value.
2. The method according to claim 1, characterized in that said low-voltage circuit breaker simulation model comprises: a conductive loop, an interior atmosphere, and a housing, the conductive loop comprising: the device comprises a wire inlet end, a wire outlet end, a bimetallic strip, a moving contact, a static contact, a coil, a flexible connection, an iron yoke, an arc striking piece and a contact resistor.
3. The method of claim 1, wherein the calculating the air heat convection coefficients of different types of low-voltage circuit breakers under different environmental parameters comprises:
the air heat convection coefficient of each type of low-voltage circuit breaker at different moments under different environmental parameters is calculated according to the structural material parameters of the low-voltage circuit breaker based on the following formula, and the method comprises the following steps:
Nu＝C(GrPr)n (2)
the method comprises the following steps of (1) utilizing a formula (1) and (2) utilizing a formula (2) to simultaneously solve and obtain air thermal convection coefficients h at different moments under different environmental parameters; determining the Gr and Pr of Gravax number by using the formula (3) and the formula (4); nu is Nusselqizi number, n is coefficient, C is constant, g is gravity acceleration, alphaVIs the coefficient of volume expansion, τtThe temperature rise at the time t, l is the characteristic length of the heating element, v is the kinematic viscosity of air, eta is the dynamic viscosity of air, cpIs the specific heat capacity of air, and lambda is the thermal conductivity of air;
and respectively carrying out iterative solution on the air heat convection coefficients of the low-voltage circuit breakers of the same model at different times under different environmental parameters to obtain stable values of the air heat convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters.
4. The method of claim 1, further comprising:
the method comprises the steps of determining temperature rise simulation values of low-voltage circuit breakers of different models under different high-altitude environment parameters by using a corrected low-voltage circuit breaker simulation model, determining temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters according to a difference value of the temperature rise simulation values and a temperature rise reference value, and determining a temperature rise correction value table according to the obtained temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters.
5. The method according to claim 1, wherein said determining the detection result of the low-voltage circuit breaker to be detected in a high altitude environment according to the calculated temperature rise value comprises:
if the calculated temperature rise value is less than or equal to the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is qualified;
and if the calculated temperature rise value is larger than the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is unqualified.
6. A system for thermal performance detection of a low-voltage circuit breaker in a high altitude environment, characterized in that it comprises:
the simulation unit is used for establishing an initial low-voltage circuit breaker simulation model, calculating air heat convection coefficients of low-voltage circuit breakers of different models under different environmental parameters, and simulating by using the initial low-voltage circuit breaker simulation model to obtain initial temperature simulation values of the low-voltage circuit breakers of different models under different environmental parameters; wherein the environmental parameters include: air pressure, temperature and humidity;
the low-voltage circuit breaker simulation model correcting unit is used for respectively carrying out temperature rise tests on low-voltage circuit breakers of different models under different environmental parameters, respectively acquiring temperature rise data of actual wire inlet and outlet terminals and shells of the low-voltage circuit breakers of different models, and correcting the low-voltage circuit breaker simulation model according to the acquired temperature rise data of the actual wire inlet and outlet terminals and shells of the low-voltage circuit breakers of different models and the initial temperature simulation value to acquire a corrected low-voltage circuit breaker simulation model;
the temperature rise reference value acquisition unit is used for respectively carrying out temperature rise tests on the low-voltage circuit breakers of different models under the standard environmental parameters and determining the temperature rise reference value according to the temperature rise data of the low-voltage circuit breakers of different models under the standard environmental parameters;
the temperature rise correction value acquisition unit is used for determining a temperature rise simulation value of the low-voltage circuit breaker to be detected under a preset high-altitude environment parameter by using the corrected low-voltage circuit breaker simulation model and determining a temperature rise correction value according to a difference value of the temperature rise simulation value and a temperature rise reference value;
the detection result determining unit is used for carrying out a temperature rise test on the low-voltage circuit breaker to be detected under the standard environmental parameters so as to obtain a temperature rise test value, determining a temperature rise calculation value of the low-voltage circuit breaker to be detected under the preset high-altitude environmental parameters according to the sum of the temperature rise test value and the temperature rise correction value, and determining a detection result of the low-voltage circuit breaker to be detected under the high-altitude environment according to the temperature rise calculation value.
7. The system of claim 6, wherein the low voltage circuit breaker simulation model comprises: a conductive loop, an interior atmosphere, and a housing, the conductive loop comprising: the device comprises a wire inlet end, a wire outlet end, a bimetallic strip, a moving contact, a static contact, a coil, a flexible connection, an iron yoke, an arc striking piece and a contact resistor.
8. The system of claim 6, wherein the initial temperature simulation value determining unit calculates air thermal convection coefficients of different types of low-voltage circuit breakers under different environmental parameters, and comprises:
according to the structural material parameters of the low-voltage circuit breaker, the air heat convection coefficient of the low-voltage circuit breaker of each model at different moments under different environmental parameters is calculated based on the following formula, and the method comprises the following steps:
Nu＝C(GrPr)n (2)
the method comprises the following steps of (1) utilizing a formula (1) and (2) utilizing a formula (2) to simultaneously solve and obtain air thermal convection coefficients h at different moments under different environmental parameters; determining the Gr and Pr of Gravax number by using the formula (3) and the formula (4); nu is Nusselqizi number, n is coefficient, C is constant, g is gravity acceleration, alphaVIs the coefficient of volume expansion, τtThe temperature rise at the time t, l is the characteristic length of the heating element, v is the kinematic viscosity of air, eta is the dynamic viscosity of air, cpIs the specific heat capacity of air, and lambda is the thermal conductivity of air;
and respectively carrying out iterative solution on the air heat convection coefficients of the low-voltage circuit breakers of the same model at different times under different environmental parameters to obtain stable values of the air heat convection coefficients of the low-voltage circuit breakers of different models under different environmental parameters.
9. The system of claim 6, further comprising:
and the temperature rise correction value table determining unit is used for determining temperature rise simulation values of the low-voltage circuit breakers of different models under different high-altitude environment parameters by using the corrected low-voltage circuit breaker simulation model, determining temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters according to the difference value of the temperature rise simulation values and the temperature rise reference value, and determining the temperature rise correction value table according to the obtained temperature rise correction values of the low-voltage circuit breakers of different models under different high-altitude environment parameters.
10. The system according to claim 6, wherein the detection result determining unit determines the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment according to the calculated temperature rise value, and includes:
if the calculated temperature rise value is less than or equal to the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is qualified;
and if the calculated temperature rise value is larger than the required temperature rise value in the detection standard of the low-voltage circuit breaker, determining that the detection result of the low-voltage circuit breaker to be detected in the high-altitude environment is unqualified.
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