CN115935618A - Composite insulator aging state assessment method and system - Google Patents
Composite insulator aging state assessment method and system Download PDFInfo
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- CN115935618A CN115935618A CN202211469988.7A CN202211469988A CN115935618A CN 115935618 A CN115935618 A CN 115935618A CN 202211469988 A CN202211469988 A CN 202211469988A CN 115935618 A CN115935618 A CN 115935618A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a method and a system for evaluating the aging state of a composite insulator, which comprises the following steps: based on the performance of the composite insulator, adopting a secondary comprehensive evaluation standard to layer the aging index of the composite insulator; and establishing a state evaluation system model, and grading the aging state of the composite insulator. The aging evaluation method is based on multiple properties of the composite insulator, adopts a secondary evaluation standard to layer the aging index of the composite insulator, realizes multi-dimensional aging evaluation of the composite insulator according to the relation of characteristic quantities related to a primary index and a secondary index, and divides the aging state of the composite insulator into four grades by establishing a state evaluation system model to realize the aging life prediction of the composite insulator.
Description
Technical Field
The invention relates to the technical field of composite insulators, in particular to a method and a system for evaluating the aging state of a composite insulator.
Background
When the composite insulator is operated in a long-term outdoor environment, the composite insulator can be subjected to the comprehensive action of various environmental factors in the nature, such as electric fields and partial discharge caused by the electric fields, water or moisture, ultraviolet radiation, temperature, ozone, parasites, mechanical stress and the like. Under the long-term complex comprehensive action of various environmental stresses, various operation problems such as aging and the like can occur in the composite insulator, and after the composite insulator is aged, the hydrophobicity of the composite insulator is degraded, the umbrella sleeve is hardened, and silicon rubber molecules are degraded, so that the normal operation of the composite insulator is seriously influenced, and the safe and reliable operation of a power grid is further influenced. Therefore, how to evaluate the aging state of the composite insulator is an urgent problem to be solved.
The aging state of the composite insulator is represented by a plurality of variables, whether the composite insulator is aged or not is not measured by a uniform standard, and the experience at home and abroad shows that the partial screen-hung composite insulator has serious phenomena of appearance aging such as pulverization, whitening, silver lines and the like, and reduction of hydrophobicity and mechanical strength, so that the malignant faults such as insulation breakdown, string breakage and the like in the composite insulator are caused.
Therefore, the method and the system for evaluating the aging state of the composite insulator are provided to solve the problems.
Disclosure of Invention
The method and the system for evaluating the aging state of the composite insulator are based on multiple performances of the composite insulator, adopt a secondary evaluation standard to layer the aging index of the composite insulator, realize the multi-dimensional aging evaluation of the composite insulator, realize the aging life prediction of the composite insulator by establishing a state evaluation system model, and solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention relates to a composite insulator aging state evaluation method, which comprises the following steps: based on the performance of the composite insulator, adopting a secondary comprehensive evaluation standard to layer the aging index of the composite insulator;
and establishing a state evaluation system model, and grading the aging state of the composite insulator.
Preferably, the secondary comprehensive evaluation standard comprises a primary index and a secondary index for reflecting the performance of the composite insulator; the secondary index is used to reflect the performance limitations of the primary index.
Preferably, the first-level indexes comprise the appearance state and hydrophobic property, the electrical property and mechanical property, the microscopic property and other factors of the composite insulator; the secondary indexes of the appearance state comprise color difference and hardness; the second-level index of the hydrophobicity comprises hydrophobicity and hydrophobic migration; the secondary indexes of the electrical performance comprise leakage current and power frequency dry tolerance; secondary indicators of mechanical properties include tear strength and tensile strength; the secondary indexes of the microscopic properties comprise microscopic pore diameter, functional groups and microwave defects; secondary indicators of the other factors include an operating age, an operating temperature mean, and an operating humidity mean.
Preferably, the state evaluation system model comprises the establishment of a state variable set, a comment set and an evaluation matrix, the processing of a fuzzy operator and an index, the normalization processing of the index, the selection of a membership function, the determination of the index weight, the determination of the grade and the life prediction.
Preferably, if U is a first expression of the state variable set, where the first expression represents a set formed by primary indexes of the composite insulator, the first expression is:
U＝{u i (i＝1，2，3，4，5，6)}；
let U 1j If the second-level index is an expression two, the expression two is as follows:
U 1j ＝(j＝1，2，.....)。
preferably, the aging state of the composite insulator is divided into four grades, including good performance, normal performance, light aging and severe aging; let the comment set of the four ranks be V = { V = } 1 ，v 2 ，v 3 ，v 4 }; setting the comment set state as V k (k =1,2,3,4); setting the membership degree of the comment set state as r jk (ii) a Let the set of membership be R j ＝{r j1 ，r j2 ，r j3 ，r j4 }; for any one of the primary indexes or the secondary indexes, setting the evaluation matrix as follows:
preferably, different weights are given to any one of the primary indexes or the secondary indexes based on the evaluation matrix to form a weight set; and synthesizing the evaluation matrix and the weight set by constructing the fuzzy operator to obtain an evaluation result.
Preferably, the four levels are quantized, and the four levels are respectively represented by V k Is represented by the formula V k = (1, 2,3, 4); and adopting a weighted average formula to calculate, and then mapping with the evaluation result to obtain a service life prediction model of the composite insulator:
the invention relates to a composite insulator aging state evaluation system, which comprises: the first unit is used for layering the aging index of the composite insulator by adopting a secondary comprehensive evaluation standard based on the performance of the composite insulator;
and the second unit is used for establishing a state evaluation system model and grading the aging state of the composite insulator.
The invention has the beneficial effects that:
the method and the system for evaluating the aging state of the composite insulator are based on multiple performances of the composite insulator, the aging indexes of the composite insulator are layered by adopting a secondary evaluation standard, the multi-dimensional aging evaluation of the composite insulator is realized according to the relation of the characteristic quantities related to the primary index and the secondary index, and the aging state of the composite insulator is divided into four grades by establishing a state evaluation system model, so that the aging life prediction of the composite insulator is realized.
Drawings
Fig. 1 is a schematic diagram of a method for evaluating an aging state of a composite insulator according to the present invention;
FIG. 2 is a schematic diagram of a composite insulator aging status evaluation system according to the present invention;
FIG. 3 is a schematic diagram of the two-stage comprehensive evaluation criteria of the present invention.
Description of the main reference numerals:
1. a first unit; 2. a second unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The method for evaluating the aging state of the composite insulator, which is provided by the invention, is described by combining the figure 1, and comprises the following steps:
s1, based on the performance of the composite insulator, adopting a secondary comprehensive evaluation standard to layer the aging index of the composite insulator;
s2, establishing a state evaluation system model, and grading the aging state of the composite insulator.
The secondary comprehensive evaluation standard comprises a primary index and a secondary index for reflecting the performance of the composite insulator; the secondary index is used to reflect the performance limitations of the primary index.
The first-level indexes comprise the appearance state and hydrophobic property, the electrical property and mechanical property, the microscopic property and other factors of the composite insulator; secondary indexes of the appearance state comprise color difference and hardness; the second level index of the hydrophobicity comprises hydrophobicity and hydrophobic migration; secondary indicators of electrical performance include leakage current and power frequency dry endurance; secondary indicators of mechanical properties include tear strength and tensile strength; secondary indexes of microscopic properties include microscopic pore size, functional groups and microwave defects; secondary indicators for other factors include operating age, operating temperature mean, and operating humidity mean.
The state evaluation system model comprises the establishment of a state variable set, a comment set and an evaluation matrix, the processing of a fuzzy operator and an index, the normalization processing of the index, the selection of a membership function, the determination of index weight, the determination of grade and the prediction of service life.
In the multi-index evaluation system, because the orders of magnitude and dimensions of all indexes are different, if the indexes are directly applied to an evaluation model, the calculation process becomes complicated, so that in the evaluation system model based on the multi-index evaluation system, a normalization formula is used for processing data, the value range is set to be [0,1], and meanwhile, the processing of positive correlation and negative correlation between the performance and the value is considered;
because the different state grades of the evaluation indexes are in an interval range mutually covered, the selected membership function is a distribution function combining a semi-trapezoid and a triangle, and the result of the function is consistent compared with the result obtained by other complex membership functions, the method for determining the membership function of the evaluation indexes determines the fuzzy boundary interval of the distribution function after the measured data normalization processing of each index, thereby obtaining the membership functions of the normalized values of each evaluation index under different state grades;
let U be the first expression of the state variable set, and the first expression represents the set formed by the first-level indexes of the composite insulator, then the first expression is:
U＝{u i (i＝1，2，3，4，5，6)}；
order U 1j And if the second-level index is an expression II, the expression II is as follows:
U 1j ＝(j＝1，2，.....)。
dividing the aging state of the composite insulator into four grades, including good performance, general performance, light aging and severe aging; set to four levels comment set V = { V = { (V) } 1 ，v 2 ，v 3 ，v 4 }; set the comment set state as V k (k =1,2,3,4); let the membership degree of the comment set state be r jk (ii) a Let the set of membership be R j ＝{r j1 ，r j2 ，r j3 ，r j4 }; for any one primary index or secondary index, setting an evaluation matrix as follows:
the constant weight values of all the rating indexes of the composite insulator are determined by applying an improved analytic hierarchy process, and a general analytic hierarchy process is effectively improved by applying an optimal transfer matrix, so that the consistency of the values is met.
Based on the evaluation matrix, giving different weights to any one primary index or secondary index to form a weight set; and synthesizing the evaluation matrix and the weight set by constructing a fuzzy operator to obtain an evaluation result.
In a general grade evaluation problem, a maximum membership principle is adopted, namely, the state of the composite insulator is evaluated according to the membership value, but the maximum membership principle can cause the condition of unreasonable evaluation due to slight difference among data, and then the aging state of the composite insulator is judged by a weighted average method to obtain a life prediction model for predicting the composite insulator;
quantizing four levels, wherein the four levels are respectively V k Is represented by V k ＝(1、2、34); and adopting a weighted average formula to calculate, and then mapping with the evaluation result to obtain a service life prediction model of the composite insulator:
the invention provides a composite insulator aging state evaluation system, as shown in fig. 2, comprising: the first unit 1 is used for layering the aging indexes of the composite insulator by adopting a secondary comprehensive evaluation standard based on the performance of the composite insulator;
and the second unit 2 is used for establishing a state evaluation system model and grading the aging state of the composite insulator.
In summary, the method and system for evaluating the aging state of the composite insulator provided by the invention are based on multiple performances of the composite insulator, the aging indexes of the composite insulator are layered by adopting a secondary evaluation standard, the multi-dimensional aging evaluation of the composite insulator is realized according to the relation between the primary indexes and the related characteristic quantities of the secondary indexes, and the aging state of the composite insulator is divided into four grades by establishing a state evaluation system model, so that the aging life prediction of the composite insulator is realized.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. A composite insulator aging state assessment method is characterized by comprising the following steps: based on the performance of the composite insulator, adopting a secondary comprehensive evaluation standard to layer the aging index of the composite insulator;
and establishing a state evaluation system model, and grading the aging state of the composite insulator.
2. The method according to claim 1, wherein the secondary comprehensive evaluation criteria comprises a primary index and a secondary index for reflecting the performance of the composite insulator; the secondary index is used for reflecting the performance limitation of the primary index.
3. The method for evaluating the aging state of the composite insulator, according to claim 2, wherein the primary indexes comprise the appearance state and the hydrophobic property, the electrical property and the mechanical property, the microscopic property and other factors of the composite insulator; the second-level indexes of the appearance state comprise color difference and hardness; the second-level index of the hydrophobicity comprises hydrophobicity and hydrophobic migration; the secondary indexes of the electrical performance comprise leakage current and power frequency dry tolerance; secondary indicators of mechanical properties include tear strength and tensile strength; the secondary indexes of the microscopic properties comprise microscopic pore diameter, functional groups and microwave defects; secondary indicators for the other factors include operating age, operating temperature mean, and operating humidity mean.
4. The method for evaluating the aging state of the composite insulator according to claim 1, wherein the state evaluation system model comprises establishment of a state variable set, a comment set and an evaluation matrix, fuzzy operator and index processing, normalization processing of the indexes, selection of membership functions, determination of weight of the indexes, determination of grades and life prediction.
5. The method according to claim 4, wherein U is an expression I of the state variable set, and the expression I represents a set consisting of primary indexes of the composite insulator, so that the expression I is:
U＝{u i (i＝1，2，3，4，5，6)}；
let U 1j If the second-level index is an expression two, the expression two is as follows:
U 1j ＝(j＝1，2，.....)。
6. the method for evaluating the aging state of the composite insulator according to claim 4, wherein the aging state of the composite insulator is divided into four grades, including good performance and normal performance, light aging and severe aging; let the comment set of the four ranks be V = { V = } 1 ，v 2 ，v 3 ，v 4 }; setting the comment set state as V k (k =1,2,3,4); setting the membership degree of the comment set state as r jk (ii) a Let the set of membership be R j ＝{r j1 ，r j2 ，r j3 ，r j4 }; for any one of the primary indexes or the secondary indexes, setting the evaluation matrix as follows:
7. the method for evaluating the aging state of the composite insulator according to claim 4, wherein different weights are given to any one of the primary indexes or the secondary indexes based on the evaluation matrix to form a weight set; and synthesizing the evaluation matrix and the weight set by constructing the fuzzy operator to obtain an evaluation result.
8. The method according to claim 4, wherein the four grades are quantified, and the four grades are respectively represented by V k Is represented by the formula V k = (1, 2,3, 4); and adopting a weighted average formula to calculate, and then mapping with the evaluation result to obtain a service life prediction model of the composite insulator:
9. a composite insulator aging state evaluation system, comprising:
the first unit is used for layering the aging index of the composite insulator by adopting a secondary comprehensive evaluation standard based on the performance of the composite insulator;
and the second unit is used for establishing a state evaluation system model and grading the aging state of the composite insulator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117438012A (en) * | 2023-11-16 | 2024-01-23 | 国网山东省电力公司超高压公司 | Multi-factor aging test analysis system for composite insulator material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117438012A (en) * | 2023-11-16 | 2024-01-23 | 国网山东省电力公司超高压公司 | Multi-factor aging test analysis system for composite insulator material |
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