CN110082652B - Selection method and device for arcing horn and insulator string in overhead transmission line - Google Patents
Selection method and device for arcing horn and insulator string in overhead transmission line Download PDFInfo
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- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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Abstract
The invention provides a selection method and a selection device for arcing horns and insulator strings in an overhead power transmission line, wherein the selection method comprises the following steps: selecting a preset arcing horn according to the impact withstand voltage value to be borne by the arcing horn in the power transmission line, and determining the withstand voltage value of the preset arcing horn; acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators; calculating effectiveness index parameters of the preset arcing horn on the insulator string according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string; and determining the arcing angle and the insulator string according to the effectiveness index parameters. On the premise of the characteristic of discharge randomness, the selection and matching of the arcing horn and the insulator string are facilitated, reference can be provided for the selection and matching of the arcing horn and the insulator string without complete tests, the efficiency of selecting the arcing horn and the insulator string is improved, the reliability is high, the period of the method is short, and the cost is low.
Description
Technical Field
The invention relates to the field of electric power, in particular to a method and a device for selecting arcing horns and insulator strings in an overhead power transmission line.
Background
The insulator string is additionally provided with the arcing horn, which is a dredging type lightning protection mode, is widely applied abroad, and is mostly used on a grounding polar line in China. At present, the matching relation between the arcing angle gap and the insulator string is determined at home and abroad based on experimental research, the reliability of experimental research results has direct guiding significance for determining the arcing angle gap, but the experimental research has the defects of long period and high cost, so that the efficiency of selecting the arcing angle and the insulator string is low.
Disclosure of Invention
In view of the above, the invention provides a method and a device for selecting a arcing horn and an insulator string in an overhead power transmission line, which are used for solving the problems of low efficiency, long period and high cost in selecting and matching the arcing horn and the insulator string.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the method for selecting the arcing horn and the insulator string in the overhead transmission line according to the embodiment of the invention comprises the following steps:
step S1, selecting a preset arcing horn according to the impact withstand voltage value to be borne by the arcing horn in the power transmission line, and determining the withstand voltage value of the preset arcing horn;
step S2, acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators;
step S3, calculating effectiveness index parameters of the insulator string by the preset arcing horn according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string;
and step S4, determining the arcing angle and the insulator string according to the effectiveness index parameters.
Further, the step S4 includes:
and when the effectiveness index parameter accords with a preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the given number of insulators as a determined insulator string.
Further, the step S4 includes:
when the effectiveness index parameter is lower than a preset value, increasing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter meets the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the increased number of the insulators as a determined insulator string;
and when the effectiveness index parameter is higher than a preset value, reducing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter accords with the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the reduced number of the insulators as a determined insulator string.
Further, in step S3, the method for calculating the validity index parameter includes:
calculating U according to the following formula (1)I50％Calculating U according to the following formula (2)A50％，
Wherein, UIAnd UAObeying a normal distribution, random variable UIFor surge flashover voltage of insulator strings, random variable UAFor striking flashover voltage at arcing horn, UI50％50% discharge voltage, σ, of the insulator stringIStandard deviation of the discharge voltage of the insulator string, UA50% is 50% discharge voltage, sigma, of arcing angleAIs the standard deviation of the discharge voltage of the arcing horn;
calculating the effectiveness index parameter according to the following formula (3):
wherein the content of the first and second substances,
δ～N(0，1)，ΔU＝UA-UI，
σ is the standard deviation of Δ U,
is the mean of Δ U and P is the probability distribution function.
In a second aspect, a device for selecting a arcing horn and an insulator string in an overhead transmission line according to an embodiment of the present invention includes:
the first acquisition module is used for selecting a preset arcing horn according to the impact withstand voltage value to be borne by the arcing horn in the power transmission line and determining the withstand voltage value of the preset arcing horn;
the second acquisition module is used for acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators;
the calculation module is used for calculating the effectiveness index parameters of the preset arcing horn on the insulator string according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string;
and the judging module is used for determining the arcing angle and the insulator string according to the effectiveness index parameters.
Further, the judging module is configured to, when the validity indicator parameter meets a preset value, use the preset arcing angle as a determined arcing angle, and use an insulator string composed of a given number of insulators as a determined insulator string.
Further, when the effectiveness index parameter is lower than the preset value, the judging module is configured to increase the number of insulators, execute step S2 and step S3 until the effectiveness index parameter meets the preset value, use the preset arcing angle as a determined arcing angle, and use an insulator string formed by the increased number of insulators as a determined insulator string;
and the number of the insulators is reduced when the effectiveness index parameter is higher than a preset value, the steps S2 and S3 are executed until the effectiveness index parameter meets the preset value, the preset arcing angle is used as a determined arcing angle, and an insulator string consisting of the reduced number of the insulators is used as a determined insulator string.
Further, the calculating module is used for calculating U according to the following formula (1)I50％Calculating U according to the following formula (2)A50％，
Wherein, UIAnd UAObeying a normal distribution, random variable UIFor surge flashover voltage of insulator strings, random variable UAFor striking flashover voltage at arcing horn, UI50％50% discharge voltage, σ, of the insulator stringIStandard deviation of the discharge voltage of the insulator string, UA50％50% discharge voltage, σ, for arcing angleAIs the standard deviation of the discharge voltage of the arcing horn;
the calculation module is configured to calculate the effectiveness indicator parameter according to the following equation (3):
wherein the content of the first and second substances,
δ～N(0，1)，ΔU＝UA-UI，
σ is the standard deviation of Δ U,
is the mean of Δ U and P is the probability distribution function.
In a third aspect, a terminal according to an embodiment of the present invention includes a processor, a memory, and a computer program stored in the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the selecting method according to the above embodiment.
In a fourth aspect, according to the computer-readable storage medium of the embodiment of the present invention, the computer-readable storage medium stores thereon a computer program, and the computer program, when executed by a processor, implements the steps of the selecting method described in the above embodiment.
The technical scheme of the invention has the following beneficial effects:
according to the selection method of the arcing horn and the insulator string in the overhead transmission line, the preset arcing horn is selected according to the impact withstand voltage value to be borne by the arcing horn in the transmission line, and the withstand voltage value of the preset arcing horn is determined; acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators; calculating effectiveness index parameters of the preset arcing horn on the insulator string according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string; and determining the arcing angle and the insulator string according to the effectiveness index parameters. On the premise of the characteristic of discharge randomness, the selection and matching of the arcing horn and the insulator string are facilitated, reference can be provided for the selection and matching of the arcing horn and the insulator string without complete tests, the efficiency of selecting the arcing horn and the insulator string is improved, the reliability is high, the period of the method is short, and the cost is low.
Drawings
Fig. 1 is a schematic flow chart of a method for selecting a arcing horn and an insulator string in an overhead power transmission line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection of a selecting device according to an embodiment of the present invention.
Reference numerals
A first acquisition module 10; a second acquisition module 20;
a calculation module 30; and a decision block 40.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
First, a method for selecting a arcing horn and an insulator string in an overhead power transmission line according to an embodiment of the present invention is described in detail with reference to the accompanying drawings.
As shown in fig. 1, the method for selecting the arcing horn and the insulator string in the overhead power transmission line according to the embodiment of the invention comprises the following steps: step S1, selecting a preset arcing horn according to the withstand voltage value of the arcing horn in the power transmission line, and determining the withstand voltage value of the preset arcing horn, wherein the withstand voltage value of the arcing horn is the operation overvoltage or the lightning overvoltage of the arcing horn in the power transmission line; step S2, acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators; step S3, calculating effectiveness index parameters of the insulator string by the preset arcing horn according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string; and step S4, determining the arcing angle and the insulator string according to the effectiveness index parameters. On the premise of the characteristic of discharge randomness, the selection and matching of the arcing horn and the insulator string are facilitated, reference can be provided for the selection and matching of the arcing horn and the insulator string without complete tests, the efficiency of selecting the arcing horn and the insulator string is improved, the reliability is high, the period of the method is short, and the cost is low.
In step S1, the power transmission line may include an earth electrode line and a neutral electrode bus, and the withstand voltage of the required arcing angle gap may be determined according to the operating overvoltage on the earth electrode line and the operating overvoltage protection level of the neutral electrode bus, and the arcing angle gap may be determined according to the withstand voltage of the required arcing angle gap. The operation overvoltage on the grounding electrode circuit and the operation overvoltage protection level of the neutral electrode bus can be reasonably selected according to actual conditions, and the operation overvoltage protection level is the basis for insulation matching under the operation overvoltage of the grounding electrode circuit. Generally, the operation overvoltage protection level on the grounding electrode line can be obtained through modeling simulation analysis of a direct-current transmission system, the operation overvoltage protection level of a neutral electrode bus can be obtained through parameters of a neutral electrode bus arrester, then the withstand voltage of an arc attracting angle gap is determined, the withstand voltage is determined according to the existing design rules and specifications, on the basis of the withstand voltage of the arc attracting angle gap, based on the rules or test data, the arc attracting angle gap is determined on the basis of the principle that the arc attracting angle gap is not broken down under the operation overvoltage, then the preset arc attracting angle is selected, and the determination can be carried out according to requirements, so that the selected arc attracting angle and an insulator string can meet the protection requirements, and the protection effect is improved.
In some embodiments of the present invention, the step S4 may include: and when the effectiveness index parameter accords with a preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the given number of insulators as a determined insulator string. Each insulator string is composed of a plurality of insulators, parameters of the insulators, such as the structure heights of the insulators and the like, can be selected according to actual needs, the length of each insulator string is obtained through the sum of the structure heights of the insulators, validity index parameters are the probability of protecting the safety of a circuit, when the validity index parameters meet preset values, the protection validity of the whole circuit reaches protection requirements, a preset arcing angle can be used as a determined arcing angle, the insulator string composed of the given number of the insulators is used as the determined insulator string, and the selected arcing angle and the selected insulator string meet the protection requirements.
In other embodiments of the present invention, the step S4 includes: and when the effectiveness index parameter is lower than a preset value, increasing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter meets the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the increased number of the insulators as a determined insulator string. That is, when the validity index parameter is lower than the preset value, it indicates that the protection effect on the circuit does not meet the predetermined requirement, at this time, the number of the insulators may be increased, step S2 and step S3 are repeatedly executed until the validity index parameter meets the preset value, the preset arcing angle may be used as the determined arcing angle, and the insulator string formed by the increased number of insulators may be used as the determined insulator string, so that the selected arcing angle and the insulator string meet the protection requirement.
And when the effectiveness index parameter is higher than a preset value, reducing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter accords with the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the reduced number of the insulators as a determined insulator string. That is, when the validity index parameter is higher than the preset value, it indicates that the protection effect on the circuit is higher than the preset requirement, in order to reduce the cost on the premise of meeting the preset requirement, the number of insulators may be reduced, at this time, the steps S2 and S3 may be repeatedly performed until the validity index parameter meets the preset value, the preset arcing angle may be used as the determined arcing angle, and the insulator string composed of the reduced number of insulators may be used as the determined insulator string, so that the selected arcing angle and the insulator string meet the protection requirement.
In an embodiment of the present invention, in step S3, the method for calculating the validity index parameter includes: referring to typical discharge tests of different insulator strings under operation overvoltage, the impact flashover voltage of the insulator string is a random variable UIReferring to typical discharge tests of different air gaps under the condition of operating overvoltage, the impact flashover voltage of the arcing angle is a random variable UAU can be calculated from the following formula (1)I50％U can be calculated from the following formula (2)A50％，
Wherein, UIAnd UAObeying a normal distribution, random variable UIFor surge flashover voltage of insulator strings, random variable UAFor striking flashover voltage at arcing horn, UI50％50% discharge voltage, σ, of the insulator stringIStandard deviation of the discharge voltage of the insulator string, UA50％50% discharge voltage, σ, for arcing angleAIs the standard deviation of the discharge voltage of the arcing horn;
the effectiveness index parameter may be calculated according to the following equation (3):
wherein the content of the first and second substances,
δ～N(0，1)，ΔU＝UA-UI，
σ is the standard deviation of Δ U, σ2Is the variance of the delta U and,
is the mean of Δ U and P is the probability distribution function.
According to probability theory, Δ U also follows a normal distribution, assuming UAAnd UIIndependently of one another, have a mean value of
Δ U obeys a normal distribution, variance σ2Is composed of
Δ U is represented by the following formula (3 a):
according to the basic principle of flashover, when the insulator string impacts the flashover voltage UIImpulse flashover voltage U larger than arcing angleAWhen the delta U is less than 0, the arc striking angle can effectively protect the insulator string, the effectiveness index parameter of the arc striking angle to the insulator string is rho, namely the probability that the arc striking angle can effectively protect the insulator string is rho, and rho is expressed by the following formula (3 b):
ρ＝P(ΔU＜0) (3b)
using normalization processing, order
Delta. to N (0, 1), the following formula (3c) is obtained
Further, the above equation (3) is obtained, and as is clear from the above equation, the validity index parameter ρ is directly affected by the standard deviation of the 50% discharge voltage and the discharge voltage of the insulator string and the arcing angle, and is calculated by using the equation (3). By the method, the effectiveness index parameter rho can be rapidly and accurately calculated, and the accuracy and reliability of the calculation result are improved.
According to the relationship among the 50% discharge voltage of the arcing angle, the 50% discharge voltage of the insulator string, the matching coefficient and the standard deviation coefficient, the following formula can be obtained:
UA50％＝kUI50％(8)，σA＝γAUA50％(9)，σI＝γIUI50％ (10)，
the following formula (4) can be obtained by combining the above formulae (3), (8), (9) and (10):
wherein k (k is less than or equal to 1) is the matching coefficient of 50% discharge voltage of the arcing angle and 50% discharge voltage of the insulator string, and can be approximately considered that the ratio of the length of the gap of the arcing angle to the effective length of the insulator string is the matching coefficient k, gammaAThe standard deviation coefficient of 50% discharge voltage of arcing angle, gammaIIs the standard deviation coefficient of 50% discharge voltage of the insulator string. The formula (4) shows the relationship between the fit coefficient, the effectiveness index parameter rho, the fit coefficient and the standard deviation coefficient of the arcing angle and the insulator string, and when other parameters are known, the effectiveness index parameter rho can be obtained through the fit coefficient, and the corresponding fit coefficient can also be obtained through the effectiveness index parameter rho. When the arc striking angle and the insulator string are determined, the matching coefficient k is also determined, and similarly, when the matching coefficient k of the arc striking angle and the insulator string is determined, the arc striking angle and the insulator string can also be determined.
By the method, the effectiveness index parameter rho can be quickly and accurately determined, the arc striking angle and the insulator string can be conveniently selected and matched, reference can be provided for the selection and the matching of the arc striking angle and the insulator string without complete tests, the test times are reduced, the efficiency of selecting the arc striking angle and the insulator string is improved, the reliability is high, the period is short, and the cost is low.
The embodiment of the invention also provides a selection device of arcing horns and insulator strings in the overhead transmission line, as shown in fig. 2, the selection device comprises: the first acquisition module 10 is configured to select a preset arcing horn according to an impulse withstand voltage value to be borne by the arcing horn in the power transmission line, and determine the withstand voltage value of the preset arcing horn; the second obtaining module 20 is configured to obtain the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators; the calculation module 30 is configured to calculate an effectiveness index parameter of the preset arcing horn on the insulator string according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string; and the judging module 40 is used for determining the arcing angle and the insulator string according to the effectiveness index parameters. The effectiveness index parameters can be rapidly and accurately determined through the selecting device, the arc attracting angle and the insulator string are convenient to select and cooperate, reference can be provided for the selection and cooperation of the arc attracting angle and the insulator string under the condition that complete tests are not needed, the test times are reduced, the efficiency of selecting the arc attracting angle and the insulator string is improved, the reliability is high, the period of the method is short, and the cost is low.
In some embodiments of the present invention, the judging module 40 is configured to, when the validity indicator parameter meets a preset value, take the preset arcing angle as a determined arcing angle, and take an insulator string composed of a given number of insulators as a determined insulator string.
In other embodiments of the present invention, when the effectiveness index parameter is lower than the preset value, the determining module 40 is configured to increase the number of insulators, execute step S2 and step S3 until the effectiveness index parameter meets the preset value, use the preset arcing angle as the determined arcing angle, and use the insulator string formed by the increased number of insulators as the determined insulator string; the judging module 40 is configured to reduce the number of insulators when the validity indicator parameter is higher than a preset value, execute step S2 and step S3 until the validity indicator parameter meets the preset value, use the preset arcing angle as a determined arcing angle, and use an insulator string formed by the reduced number of insulators as a determined insulator string.
According to some embodiments of the invention, the calculation module 30 may be configured to calculate U according to the following equation (1)I50％Calculating U according to the following formula (2)A50％，
Wherein, UIAnd UAObeying a normal distribution, random variable UIFor surge flashover voltage of insulator strings, random variable UAFor striking flashover voltage at arcing horn, UI50％50% discharge voltage, σ, of the insulator stringIStandard deviation of the discharge voltage of the insulator string, UA50％50% discharge voltage, σ, for arcing angleAIs the standard deviation of the discharge voltage of the arcing horn;
the calculation module 30 may be configured to calculate the effectiveness indicator parameter according to the following equation (3):
wherein the content of the first and second substances,
δ～N(0，1)，ΔU＝UA-UI，
σ is the standard deviation of Δ U,
is the mean of Δ U and P is the probability distribution function.
The calculation module 30 can accurately calculate the validity index parameters, improve the accuracy of settlement results, and improve the reliability of the selection and matching of the arcing horn and the insulator string.
The selection device for the arcing horn and the insulator string in the overhead transmission line according to the embodiment of the present invention corresponds to the selection method in the above embodiment, and specifically, the selection method for the arcing horn and the insulator string in the overhead transmission line in the above embodiment may be referred to, and details are not repeated herein.
The embodiment of the present invention further provides a terminal, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, and when the computer program is executed by the processor, the following steps are implemented: step S1, selecting a preset arcing horn according to the impact withstand voltage value to be borne by the arcing horn in the power transmission line, and determining the withstand voltage value of the preset arcing horn; step S2, acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators; step S3, calculating effectiveness index parameters of the insulator string by the preset arcing horn according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string; and step S4, determining the arcing angle and the insulator string according to the effectiveness index parameters. Through the terminal, the selection cooperation of the arc attracting angle and the insulator string is convenient, the reference can be provided for the selection cooperation of the arc attracting angle and the insulator string under the condition that complete test is not needed, the efficiency of selecting the arc attracting angle and the insulator string is improved, the reliability is high, the method is short in period, and the cost is low.
Optionally, the computer program when executed by the processor further implements the steps of:
the step S4 includes: and when the effectiveness index parameter accords with a preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the given number of insulators as a determined insulator string.
Optionally, the computer program when executed by the processor further implements the steps of:
the step S4 includes: when the effectiveness index parameter is lower than a preset value, increasing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter meets the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the increased number of the insulators as a determined insulator string;
and when the effectiveness index parameter is higher than a preset value, reducing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter accords with the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the reduced number of the insulators as a determined insulator string.
Optionally, the computer program when executed by the processor further implements the steps of:
in step S3, the method for calculating the effectiveness index parameter includes:
calculating U according to the following formula (1)I50％Calculating U according to the following formula (2)A50％，
Wherein, UIAnd UAObeying a normal distribution, random variable UIFor surge flashover voltage of insulator strings, random variable UAFor striking flashover voltage at arcing horn, U150％50% discharge voltage, σ, of the insulator stringIStandard deviation of the discharge voltage of the insulator string, UA50％50% discharge voltage, σ, for arcing angleAIs the standard deviation of the discharge voltage of the arcing horn;
calculating the effectiveness index parameter according to the following formula (3):
wherein the content of the first and second substances,
δ～N(0，1)，ΔU＝UA-UI，
σ is the standard deviation of Δ U,
is the mean of Δ U and P is the probability distribution function.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the selecting method in the foregoing embodiment are implemented.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A method for selecting arcing horns and insulator strings in overhead transmission lines is characterized by comprising the following steps:
step S1, selecting a preset arcing horn according to the impact withstand voltage value to be borne by the arcing horn in the power transmission line, and determining the withstand voltage value of the preset arcing horn;
step S2, acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators;
step S3, calculating effectiveness index parameters of the insulator string by the preset arcing horn according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string;
step S4, determining a arcing angle and an insulator string according to the effectiveness index parameters;
in step S3, the method for calculating the effectiveness index parameter includes:
calculating U according to the following formula (1)I50％Calculating U according to the following formula (2)A50％，
Wherein, UIAnd UAObeying a normal distribution, random variable UIFor surge flashover voltage of insulator strings, random variable UAFor striking flashover voltage at arcing horn, UI50％50% discharge voltage, σ, of the insulator stringIStandard deviation of the discharge voltage of the insulator string, UA50％50% discharge voltage, σ, for arcing angleAIs the standard deviation of the discharge voltage of the arcing horn;
calculating the effectiveness index parameter according to the following formula (3):
wherein the content of the first and second substances,
δ～N(0，1)，ΔU＝UA-UI，
σ is the standard deviation of Δ U,
is the mean of Δ U and P is the probability distribution function.
2. Selection method according to claim 1, wherein said step S4 includes:
and when the effectiveness index parameter accords with a preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the given number of insulators as a determined insulator string.
3. Selection method according to claim 1, wherein said step S4 includes:
when the effectiveness index parameter is lower than a preset value, increasing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter meets the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the increased number of the insulators as a determined insulator string;
and when the effectiveness index parameter is higher than a preset value, reducing the number of the insulators, executing the step S2 and the step S3 until the effectiveness index parameter accords with the preset value, taking the preset arcing angle as a determined arcing angle, and taking an insulator string consisting of the reduced number of the insulators as a determined insulator string.
4. The utility model provides a selection device of arcing horn and insulator chain among overhead transmission line which characterized in that includes:
the first acquisition module is used for selecting a preset arcing horn according to the impact withstand voltage value to be borne by the arcing horn in the power transmission line and determining the withstand voltage value of the preset arcing horn;
the second acquisition module is used for acquiring the withstand voltage value of the insulator string according to the given parameters of the insulators and the number of the insulators;
the calculation module is used for calculating the effectiveness index parameters of the preset arcing horn on the insulator string according to the withstand voltage value of the preset arcing horn and the withstand voltage value of the insulator string;
the judging module is used for determining the arcing angle and the insulator string according to the effectiveness index parameters;
the calculation module is used for calculating U according to the following formula (1)I50％Calculating U according to the following formula (2)A50％，
Wherein, UIAnd UAObeying a normal distribution, random variable UIFor surge flashover voltage of insulator strings, random variable UAFor striking flashover voltage at arcing horn, UI50％50% discharge voltage, σ, of the insulator stringIStandard deviation of the discharge voltage of the insulator string, UA50％50% discharge voltage, σ, for arcing angleAIs the standard deviation of the discharge voltage of the arcing horn;
the calculation module is configured to calculate the effectiveness indicator parameter according to the following equation (3):
wherein the content of the first and second substances,
δ～N(0，1)，ΔU＝UA-UI，
σ is the standard deviation of Δ U,
is the mean of Δ U and P is the probability distribution function.
5. The selection device according to claim 4, wherein the judgment module is configured to, when the validity indicator parameter meets a preset value, use the preset arcing angle as a determined arcing angle, and use an insulator string composed of a given number of insulators as a determined insulator string.
6. The selecting device according to claim 4, applied to the selecting method according to any one of claims 1 to 3, wherein the judging module is configured to increase the number of insulators when the validity index parameter is lower than a preset value, execute steps S2 and S3 until the validity index parameter meets the preset value, use the preset arcing angle as the determined arcing angle, and use an insulator string composed of the increased number of insulators as the determined insulator string;
and the number of the insulators is reduced when the effectiveness index parameter is higher than a preset value, the steps S2 and S3 are executed until the effectiveness index parameter meets the preset value, the preset arcing angle is used as a determined arcing angle, and an insulator string consisting of the reduced number of the insulators is used as a determined insulator string.
7. A terminal, characterized in that it comprises a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the selection method according to any one of claims 1 to 3.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the selection method according to any one of claims 1 to 3.
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