CN111859727B - Method for establishing relation between activation energy and insulation margin of basin-type insulator - Google Patents
Method for establishing relation between activation energy and insulation margin of basin-type insulator Download PDFInfo
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Abstract
The invention relates to the technical field of power equipment measurement, and discloses a method for establishing a relation between activation energy and insulation margin of a basin-type insulator, which comprises the following steps: selecting a plurality of basin-type insulators with different types, and numbering samples; sampling and testing each basin-type insulator to obtain corresponding activation energy; performing electric field simulation on each basin-type insulator to obtain a corresponding insulation margin; and establishing a relation between the activation energy and the insulation margin of the basin-type insulator according to the activation energy and the insulation margin of each basin-type insulator. According to the invention, based on the activation energy of the basin-type insulator, a mathematical model between the insulation margin and the activation energy of the basin-type insulator is established, and the insulation margin is calculated through the activation energy, so that the research efficiency of a power system is effectively improved.
Description
Technical Field
The invention relates to the technical field of power equipment measurement, in particular to a method for establishing a relation between activation energy and insulation margin of a basin-type insulator.
Background
The gas-insulated metal-enclosed switch (GIS) uses SF6 gas as an insulating medium, has the advantages of low failure rate, small occupied area and the like, and is widely applied to power systems. And when the GIS has insulation faults, insulation aging and even breakdown can be caused, so that serious accidents and economic losses are caused. The basin-type insulator is an important insulating part in the combined electrical appliance, the performance of the basin-type insulator directly determines the operation quality of the combined electrical appliance, and according to incomplete statistics, GIS equipment adopted by a plurality of domestic and foreign power companies is subject to accidents caused by the basin-type insulator to different degrees. Therefore, the GIS basin-type insulator state prediction method is found, the hidden danger of insulation faults is discovered and eliminated in advance, and the GIS basin-type insulator state prediction method has very important significance for safe and reliable operation of the GIS.
The insulation margin is an important index reflecting the insulation performance of the basin-type insulator, but the solving process is complex, the calculated amount is large, and a large amount of simulation calculation is needed at present to calculate the insulation margin of the basin-type insulator, so that the electric power system research needs to consume a large amount of manpower and material resources, and the efficiency is low.
Disclosure of Invention
The embodiment of the invention aims to provide a method for establishing a relation between the activation energy and the insulation margin of a basin-type insulator, which is based on the activation energy of the basin-type insulator, establishes a mathematical model between the insulation margin and the activation energy of the basin-type insulator, and calculates the insulation margin through the activation energy, so that the research efficiency of a power system is effectively improved.
In order to achieve the above object, an embodiment of the present invention provides a method for establishing a relationship between activation energy and insulation margin of a basin-type insulator, including the following steps:
selecting a plurality of basin-type insulators with different types, and numbering samples;
sampling and testing each basin-type insulator to obtain corresponding activation energy;
Performing electric field simulation on each basin-type insulator to obtain a corresponding insulation margin;
And establishing a relation between the activation energy and the insulation margin of the basin-type insulator according to the activation energy and the insulation margin of each basin-type insulator.
Preferably, the sampling and testing are performed on each basin-type insulator to obtain corresponding activation energy, and specifically include:
sampling each basin-type insulator, and performing thermogravimetric analysis test to obtain a thermogravimetric analysis test result;
And according to the thermogravimetric analysis test result, calculating the corresponding activation energy based on the Flynn-Wall-Ozwa method.
Preferably, the sampling is performed on each basin-type insulator, and a thermogravimetric analysis test is performed to obtain a thermogravimetric analysis test result, which specifically includes:
After each basin-type insulator is placed in a bus cavity of a gas-insulated fully-closed combined electrical apparatus filled with sulfur hexafluoride gas, adding a preset rated operating voltage, and then sampling each basin-type insulator to obtain a plurality of basin-type insulator samples;
And performing thermogravimetric analysis test on the basin-type insulator sample by using a synchronous thermal analyzer to obtain a TG curve and a DTG curve of the basin-type insulator sample.
Preferably, the calculating the corresponding activation energy based on the Flynn-Wall-Ozwa method according to the thermogravimetric analysis test result specifically includes:
obtaining peak temperatures of thermal weightlessness curves under different heating rates according to the TG curve and the DTG curve of the basin-type insulator sample;
And calculating the activation energy corresponding to the basin-type insulator based on the Flynn-Wall-Ozwa method according to the peak temperature of the thermal weight loss curve.
Preferably, the performing electric field simulation on each of the basin-type insulators to obtain a corresponding insulation margin specifically includes:
modeling the basin-type insulators by utilizing ANSYS finite element analysis software according to the actual structure of each basin-type insulator to obtain a corresponding three-dimensional calculation model;
applying high potential to the metal end of the three-dimensional calculation model and zero potential to the outer shell so as to perform electric field simulation;
acquiring a control field intensity and a field intensity calculated value of each basin-type insulator;
And obtaining the insulation margin of each basin-type insulator according to the ratio of the corresponding control field intensity to the field intensity calculated value.
Preferably, the relation between the activation energy and the insulation margin of the basin-type insulator is r=e -2 Ea to 0.97E; wherein R is the insulation margin, E is the base number of natural logarithm, ea is the activation energy, and E is the control field intensity.
Compared with the prior art, the method for establishing the relation between the pot insulator activation energy and the insulation margin is provided, the mathematical model between the pot insulator insulation margin and the activation energy is established based on the pot insulator activation energy, and the insulation margin is calculated through the activation energy, so that the research efficiency of a power system is effectively improved.
Drawings
FIG. 1 is a flow chart of a method for establishing a basin-type insulator activation energy and insulation margin relationship according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of TG curves for creating a basin-type insulator according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a DTG curve for creating a basin-type insulator according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a fitted curve of lgβ -1/T for determining activation energy based on Flynn-Wall-Ozwa method according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of an electric field simulation of a basin-type insulator according to an embodiment of the present invention;
Fig. 6 is a schematic diagram of an electric field distribution rule of a basin-type insulator according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flow chart of a method for establishing a relationship between activation energy and insulation margin of a basin-type insulator according to an embodiment of the invention is shown, and the method includes steps S1 to S4:
s1, selecting a plurality of basin-type insulators with different types, and numbering samples;
s2, sampling and testing each basin-type insulator to obtain corresponding activation energy;
s3, performing electric field simulation on each basin-type insulator to obtain a corresponding insulation margin;
S4, according to the activation energy and the insulation margin of each basin-type insulator, establishing a relation between the activation energy and the insulation margin of the basin-type insulator.
Specifically, a plurality of basin-type insulators of different types are selected, and sample numbering is performed. Preferably, the basin-type insulator is a 252kV basin-type insulator. The purpose of selecting a plurality of basin-type insulators with different types is to obtain a plurality of groups of test data, so that a rule is obtained according to the test data.
Each basin-type insulator is sampled and tested to obtain the corresponding activation energy. Typically, a sample of a basin insulator having a mass of 10mg is measured and placed in a 70ul alumina crucible, the crucible is tapped to bring the sample into sufficient contact, and then a thermal analysis test is performed to obtain an activation energy calculation result based on the thermal analysis test.
And performing electric field simulation on each basin-type insulator to obtain a corresponding insulation margin. And calculating the insulation margin of each basin-type insulator according to the corresponding electric field.
And establishing a relation between the activation energy and the insulation margin of each basin-type insulator according to the activation energy and the insulation margin of each basin-type insulator. The above steps can obtain a set of activation energy data and corresponding insulation margin data, and the relation between the activation energy and the insulation margin of the basin-type insulator can be obtained through fitting the two sets of data.
According to the method for establishing the relation between the pot insulator activation energy and the insulation margin provided by the embodiment 1 of the invention, the mathematical model between the pot insulator insulation margin and the activation energy is established based on the pot insulator activation energy, and the insulation margin is calculated through the activation energy, so that the research efficiency of a power system is effectively improved.
As an improvement of the above solution, the sampling and testing are performed on each of the basin-type insulators to obtain corresponding activation energy, and specifically include:
sampling each basin-type insulator, and performing thermogravimetric analysis test to obtain a thermogravimetric analysis test result;
And according to the thermogravimetric analysis test result, calculating the corresponding activation energy based on the Flynn-Wall-Ozwa method.
Specifically, sampling each basin-type insulator, and performing thermogravimetric analysis test to obtain a thermogravimetric analysis test result; and according to the thermogravimetric analysis test result, calculating the corresponding activation energy based on the Flynn-Wall-Ozwa method. Thermogravimetric analysis the test can be performed using a TGA-DSC3+ simultaneous thermogravimetric analysis combination meter manufactured by mertrele-tolidol, switzerland. The Flynn-Wall-Ozwa method is abbreviated as F-W-O method, is a general calculation method for solving the activation energy, and is simple and quick.
As an improvement of the above solution, the sampling is performed on each of the basin-type insulators, and a thermogravimetric analysis test is performed to obtain a thermogravimetric analysis test result, which specifically includes:
After each basin-type insulator is placed in a bus cavity of a gas-insulated fully-closed combined electrical apparatus filled with sulfur hexafluoride gas, adding a preset rated operating voltage, and then sampling each basin-type insulator to obtain a plurality of basin-type insulator samples;
And performing thermogravimetric analysis test on the basin-type insulator sample by using a synchronous thermal analyzer to obtain a TG curve and a DTG curve of the basin-type insulator sample.
Specifically, after each basin-type insulator is placed in a bus cavity of a gas-insulated fully-enclosed combined electrical apparatus filled with sulfur hexafluoride gas (also called SF 6), a preset rated operating voltage is added, and then each basin-type insulator is sampled to obtain a plurality of basin-type insulator samples. Generally, SF6 charged in a GAS insulated fully enclosed switchgear (GAS insulated SWITCHGEAR, GIS) corresponds to the lowest functional GAS pressure.
And performing thermogravimetric analysis test on the basin-type insulator sample by using a synchronous thermal analyzer to obtain a TG curve and a DTG curve of the basin-type insulator sample. In the process of performing thermogravimetric analysis test, the temperature rising rate can be set to be 5K/min, 10K/min, 15K/min, 20K/min and 25K/min, the target temperature is increased to 800 ℃ in the furnace, and meanwhile, the change data of the sample mass along with the temperature is recorded by a computer. Referring to fig. 2 and 3, a TG curve schematic diagram and a DTG curve schematic diagram of a basin-type insulator according to the embodiment of the present invention are shown. The TG curve is a thermal weightlessness curve, and the DTG curve is a first-order differential curve of the TG curve.
As can be seen from fig. 2 and 3, the temperature rising rate has a large influence on the TG curve of the basin-type insulator. As the temperature rising rate increases, the TG curve shifts to a higher Wen Fangxiang because: the temperature rise of the sample mainly depends on heat transfer among the medium, the crucible and the sample, the temperature gradient is generated inside the sample due to the temperature difference formed between the heated crucible and the sample, and the temperature difference effect of the sample is enhanced along with the increase of the temperature rise rate. As the rate of temperature rise increases, the initial decomposition temperature, the final decomposition temperature, and the peak temperature of the sample correspondingly increase, but the 5 thermal weight loss curves of the sample are substantially similar. Furthermore, the typical thermal weight loss curve has two obvious steps, the mass loss of the step I accounts for about 5% of the total mass loss, and the maximum value of the reaction rate corresponds to the temperature of 210-250 ℃; the mass loss of the step II accounts for about 65% of the total mass loss, and the maximum value of the reaction rate corresponds to a temperature of 360-400 ℃. These thermal weight loss curves provide a fundamental basis for calculating the activation energy of the material.
As an improvement of the above scheme, the method for calculating the corresponding activation energy based on the Flynn-Wall-Ozwa method according to the thermogravimetric analysis test result specifically includes:
obtaining peak temperatures of thermal weightlessness curves under different heating rates according to the TG curve and the DTG curve of the basin-type insulator sample;
And calculating the activation energy corresponding to the basin-type insulator based on the Flynn-Wall-Ozwa method according to the peak temperature of the thermal weight loss curve.
Specifically, according to a TG curve and a DTG curve of a basin-type insulator sample, the peak temperature of a thermal weightlessness curve under different heating rates is obtained. And calculating the corresponding activation energy of the basin-type insulator based on the Flynn-Wall-Ozwa method according to the peak temperature of the thermal weight loss curve.
The following derives the activation energy solving process, assuming that the material reaction process depends only on the conversion α and the temperature T, which are independent of each other, the kinetic equation for the heterogeneous reaction at an indefinite temperature can be expressed asWhere T is time, k (T) is a temperature relationship of a rate constant, and f (α) is a reaction mechanism function.
Can be converted into by the conversion of temperature and time during linear temperature riseWhere β=dt/dT is the rate of temperature increase, which is a constant value in most experiments. Equation/>Is the most basic equation for reaction kinetics in isothermal and non-isothermal processes, and all other equations are derived based on this equation.
In the present invention, arrhenius equation is substituted intoThe general kinetic equation of the obtained heterogeneous system under the non-constant temperature condition is/>The Flynn-Wall-Ozwa method is adopted to obtain
On the other hand, since the values of βi at different temperature rising rates and the corresponding values of α at the peak top temperatures T pi are approximately equal, the values of lg (AEa/RG (α)) are all equal in the range of 0 to α p, and thus the value of Ea can be determined by using lgβ -1/T in a linear relationship. On the other hand, when the same conversion rate α is selected from βi at different temperature rising rates, G (α) is a constant value, so that lgβ1/T is linearly related, and Ea can be obtained from the slope.
The peak temperatures of thermal weight loss curves at different heating rates can be obtained through the TG curve of fig. 2 and the DTG curve of fig. 3 as shown in table 1, and referring to fig. 4, a schematic diagram of a fitting curve for determining the lgβ -1/T of activation energy based on the Flynn-Wall-Ozwa method according to the embodiment of the present invention is provided in fig. 2 and fig. 3. The final activation energy value was 177.25kJ/mol.
TABLE 1 peak thermal weight loss curve temperatures at different ramp rates
| Rate of temperature rise | 5℃/min | 10℃/min | 15℃/min | 20℃/min | 25℃/min |
| β | 368.00℃ | 381.14℃ | 389.48℃ | 395.55℃ | 397.95℃ |
As an improvement of the above solution, the performing electric field simulation on each of the basin-type insulators to obtain a corresponding insulation margin specifically includes:
modeling the basin-type insulators by utilizing ANSYS finite element analysis software according to the actual structure of each basin-type insulator to obtain a corresponding three-dimensional calculation model;
applying high potential to the metal end of the three-dimensional calculation model and zero potential to the outer shell so as to perform electric field simulation;
acquiring a control field intensity and a field intensity calculated value of each basin-type insulator;
And obtaining the insulation margin of each basin-type insulator according to the ratio of the corresponding control field intensity to the field intensity calculated value.
Referring to fig. 5, an electric field simulation of a basin-type insulator according to this embodiment of the present invention is shown. Specifically, modeling is performed on the basin-type insulators by utilizing ANSYS finite element analysis software according to the actual structure of each basin-type insulator, so as to obtain a corresponding three-dimensional calculation model.
And applying high potential to the metal end of the three-dimensional calculation model and zero potential to the shell so as to perform electric field simulation. That is, the basin-type insulator is installed between the high potential bus bar and the ground housing to function as a support fixing and insulation to the ground.
And obtaining the control field intensity and the field intensity calculation value of each basin-type insulator. Because too high a field strength on the surface of the basin-type insulator may cause creeping discharge and cause insulation failure, the field strength of the surface of the insert of the basin-type insulator needs to be controlled, so that the field strength can be controlled. In order to clearly and intuitively reflect the distribution rule of the electric potential and the electric field on the surface of the basin-type insulator, the electric potential and the electric field distribution curve of the basin-type insulator are intercepted along the path from the high-voltage conductor to the grounding shell on the surface of the basin-type insulator, and finally the electric field distribution rule of the basin-type insulator shown in fig. 6 is obtained.
And obtaining the insulation margin of each basin-type insulator according to the ratio of the corresponding control field intensity to the field intensity calculated value. Referring to table 2, the body electric field distribution calculation results of several samples of the basin-type insulator provided in this embodiment of the present invention are shown.
TABLE 2 calculation of electric field distribution of basin-type insulator body
As an improvement of the above-mentioned scheme, the relationship between the activation energy and the insulation margin of the basin-type insulator is r=e - 2 Ea-0.97E; wherein R is the insulation margin, E is the base number of natural logarithm, ea is the activation energy, and E is the control field intensity.
Specifically, the relationship between the activation energy and the insulation margin of the basin-type insulator is r=e -2 Ea to 0.97E; wherein R is an insulation margin, E is a base number of natural logarithms, ea is an activation energy, and E is a control field intensity.
The relation between the activation energy and the insulation margin of the basin-type insulator obtained above is obtained based on a large number of models, data operation fitting and judgment by combining manual experience. Through the relation between the activation energy and the insulation margin of the basin-type insulator, the insulation margin can be calculated directly through the activation energy in the follow-up process, a large number of simulation calculations are not needed, and the research on the insulation performance of the basin-type insulator is greatly facilitated.
In summary, according to the method for establishing the relation between the pot insulator activation energy and the insulation margin, which is provided by the embodiment of the invention, based on the pot insulator activation energy, a mathematical model between the pot insulator insulation margin and the activation energy is established, the insulation margin is calculated through the activation energy, a large amount of simulation calculation is not needed, and electric power operation and maintenance personnel can grasp the state of running the pot insulator in advance and take corresponding measures in time, so that a large amount of manpower and material resources are saved for an electric power system, and meanwhile, the safety and stability of the electric power system are greatly improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (1)
1. A method for establishing a relationship between activation energy and insulation margin of a basin-type insulator, comprising the steps of:
selecting a plurality of basin-type insulators with different types, and numbering samples;
sampling and testing each basin-type insulator to obtain corresponding activation energy;
Performing electric field simulation on each basin-type insulator to obtain a corresponding insulation margin;
Establishing a relation between the activation energy and the insulation margin of each basin-type insulator according to the activation energy and the insulation margin of each basin-type insulator;
Sampling and testing each basin-type insulator to obtain corresponding activation energy, wherein the sampling and testing steps specifically comprise:
sampling each basin-type insulator, and performing thermogravimetric analysis test to obtain a thermogravimetric analysis test result;
According to the thermogravimetric analysis test result, calculating corresponding activation energy based on the Flynn-Wall-Ozwa method;
Sampling each basin-type insulator, and performing thermogravimetric analysis test to obtain a thermogravimetric analysis test result, wherein the method specifically comprises the following steps of:
After each basin-type insulator is placed in a bus cavity of a gas-insulated fully-closed combined electrical apparatus filled with sulfur hexafluoride gas, adding a preset rated operating voltage, and then sampling each basin-type insulator to obtain a plurality of basin-type insulator samples;
performing thermogravimetric analysis test on the basin-type insulator sample by using a synchronous thermal analyzer to obtain a TG curve and a DTG curve of the basin-type insulator sample;
According to the thermogravimetric analysis test result, the corresponding activation energy is calculated based on the Flynn-Wall-Ozwa method, which comprises the following steps:
obtaining peak temperatures of thermal weightlessness curves under different heating rates according to the TG curve and the DTG curve of the basin-type insulator sample;
According to the peak temperature of the thermal weight loss curve, calculating to obtain the corresponding activation energy of the basin-type insulator based on a Flynn-Wall-Ozwa method;
performing electric field simulation on each basin-type insulator to obtain a corresponding insulation margin, wherein the electric field simulation comprises the following steps:
modeling the basin-type insulators by utilizing ANSYS finite element analysis software according to the actual structure of each basin-type insulator to obtain a corresponding three-dimensional calculation model;
applying high potential to the metal end of the three-dimensional calculation model and zero potential to the outer shell so as to perform electric field simulation;
acquiring a control field intensity and a field intensity calculated value of each basin-type insulator;
obtaining the insulation margin of each basin-type insulator according to the ratio of the corresponding control field intensity to the field intensity calculated value;
The relation between the activation energy and the insulation margin of the basin-type insulator is R=e -2 Ea-0.97E; wherein R is the insulation margin, E is the base number of natural logarithm, ea is the activation energy, and E is the control field intensity.
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