CN109087029B - Insulator corrosive flashover risk assessment method - Google Patents
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Abstract
The invention discloses an insulator corrosive flashover risk assessment method, which comprises the following steps: acquiring a first additional salt density of a corrosion product based on the corrosion grade of the point to be evaluated, and acquiring an equivalent additional salt density and an equivalent ash density based on the pollution grade of the point to be evaluated; obtaining a second additional salt density of acid rain by using the PH value of the rain water at the point to be evaluated; calculating the sum of the first additional salt density, the second additional salt density and the equivalent additional salt density to obtain a check salt density of the point to be evaluated, and then obtaining a check pollution degree grade of the point to be evaluated based on the check salt density and the equivalent ash density; obtaining a first uniform creepage specific distance of the insulator based on checking the pollution degree grade; determining the insulation configuration of equipment to be evaluated; and acquiring the actual creepage distance of the equipment to be evaluated from the standing book of the equipment to be evaluated at the point to be evaluated, and comparing the actual creepage distance of the equipment to be evaluated with the suggested insulation configuration to obtain the flashover risk evaluation result of the equipment to be evaluated. The present method takes into account the effects of acid rain and corrosion products on flashover.
Description
Technical Field
The invention belongs to the technical field of electric power engineering, and particularly relates to an insulator corrosive flashover risk assessment method.
Background
About 69 km in acid rain areas in China2Covering the east, south and southwest areas of china. Acid rain aggravates the filthy deposition on the surface of the insulator, and causes the metal parts to corrode to generate a plurality of chemical substances such as liquid and dust which can be settled on the surface of the insulator, thereby obviously reducing the electrical performance of the insulator. The basis of the pollution flashover prevention of the power grid in China is the measurement result of the field pollution degree, namely the dry sediment,the influence of acid rain and corrosion products of metal components is not considered, and the randomness of the acid rain and the corrosion products is strong and difficult to track. Even if the insulation matching based on the field pollution degree meets the regulation requirement, flashover can still occur due to the fact that factors such as acid rain and corrosion products of metal components are not considered. However, the existing flashover risk assessment method is also based on the measurement result of the dry sediment or the sewage area distribution map, and the influence of acid rain and corrosion products is not considered, so that the existing flashover risk assessment method in the acid rain area has limited reliability, and the accuracy of the obtained assessment result needs to be improved.
Wherein, corrosive flashover is defined as: the method comprises the following steps of firstly, flashover directly caused by acid rain, secondly, flashover caused by corrosion of towers, hardware fittings, insulator iron cap steel feet and the like, and thirdly, flashover caused by the combined action of the acid rain, corrosion products and an original dry pollution layer.
Disclosure of Invention
The invention aims to provide a brand-new insulator corrosive flashover risk assessment method aiming at the problem that the accuracy of an assessment result needs to be improved due to the fact that the existing flashover assessment method only considers a measurement result or a pollution area distribution diagram of a dry sediment but not acid rain and corrosion products. An insulator corrosive flashover risk assessment method comprises the following steps:
s1: acquiring a first additional salt density of a corrosion product based on the corrosion grade of the point to be evaluated, and acquiring an equivalent additional salt density and an equivalent ash density based on the pollution grade of the point to be evaluated;
s2: obtaining the conductivity by utilizing the PH value of the rainwater at the point to be evaluated, and obtaining a second additional salt density of the acid rainwater based on the conductivity and the equivalent salt density;
Q2＝α×γ×q
in the formula, Q2The second additional salt density, alpha is the insulator parameter, gamma is the conductivity, and q is the equivalent additional salt density;
s3: calculating the sum of the first additional salt density, the second additional salt density and the equivalent additional salt density to obtain a checking salt density of the point to be evaluated, and then obtaining a checking filth degree grade of the point to be evaluated based on the checking salt density and the equivalent ash density;
s4: obtaining a first uniform creepage ratio distance of the insulator based on a creepage ratio distance method and the dirt degree grade of the point to be evaluated;
s5: determining the insulation configuration of equipment to be evaluated;
extracting a second uniform creepage ratio distance of the insulator of the point to be evaluated from a pre-stored standing book library, and selecting the uniform creepage ratio distance according to the first uniform creepage ratio distance and the second uniform creepage ratio distance to suggest insulation configuration;
the selected creepage ratio distance is at least larger than or equal to the maximum value of the first uniform creepage ratio distance and the second uniform creepage ratio distance, and the insulation configuration is the creepage distance calculated according to the selected creepage ratio distance;
s6: acquiring the actual creepage distance of the equipment to be evaluated from the ledger of the equipment to be evaluated at the point to be evaluated, and comparing the actual creepage distance of the equipment to be evaluated with the suggested insulation configuration to obtain a flashover risk evaluation result of the equipment to be evaluated;
c: the actual creepage distance of the equipment to be evaluated is greater than or equal to the suggested insulation configuration, and the insulation configuration of the equipment to be evaluated meets the requirement;
d: the actual creepage distance of the equipment to be evaluated is smaller than the suggested insulation configuration, the insulation configuration of the equipment to be evaluated does not meet the requirements, and flashover risks exist.
The influence of corrosion products is considered, and a first additional salt density is obtained according to the corrosion grade of a point to be evaluated; and meanwhile, the influence of acid rain is considered, a second additional salt density is obtained according to the PH value of the rainwater at the point to be evaluated, the sum of the first additional salt density, the second additional salt density and the equivalent additional salt density is obtained to obtain a check salt density of the point to be evaluated, the obtained check salt density is obtained by simultaneously considering corrosion products, acid rain and dry settlement dirt, and then the check salt density is used for carrying out dirt deletion evaluation, so that the obtained evaluation result is more reliable, especially for an acid rain area, and is more consistent with the actual condition.
In addition, when the creepage distance (insulation configuration) suggested by the point to be evaluated is obtained, the method also takes historical operation experience data of the point to be evaluated into consideration, namely, a second uniform creepage ratio distance of the insulator of the point to be evaluated is extracted from a pre-stored ledger library, the second uniform creepage ratio distance and the first uniform creepage ratio distance are compared to select the uniform creepage ratio distance, and the selected uniform creepage ratio distance is at least larger than or equal to the maximum value of the first uniform creepage ratio distance and the second uniform creepage ratio distance, so that the obtained insulation configuration is more reliable.
It should be noted that a plurality of devices to be evaluated can exist at the point to be evaluated, and the method calculates the requirement of the insulating device at the point to be evaluated, and then compares the requirement with the actual operation of the devices to be evaluated to evaluate whether the devices to be evaluated have pollution flashover risks.
Further preferably, the second uniform creep ratio distance obtaining process in step S5 is as follows:
calling historical operation experience data of a point to be evaluated to judge whether pollution flashover occurs in a historical time period;
if the insulator is not subjected to the over-creepage treatment after the occurrence of the pollution flashover, the second unified creepage specific distance is a prestored unified creepage specific distance of the insulator which is not subjected to the pollution flashover treatment in the standing book library;
if the insulator is subjected to the over-creeping treatment after the pollution flashover happens, the second uniform creepage specific distance is the uniform creepage specific distance of the treated insulator in the pre-stored standing book library;
and if the pollution flashover does not occur, the second uniform creepage ratio distance is the uniform creepage ratio distance of the insulators recorded in the pre-stored standing book library.
The invention identifies whether the pollution flashover occurs according to the historical operation data, and further determines how to determine the second uniform creepage specific distance according to whether the pollution flashover occurs, thereby further ensuring that the obtained insulation configuration is more in line with the actual requirement.
More preferably, the rule for selecting the uniform creep ratio distance in step S5 is as follows:
when the insulator is not subjected to creeping treatment after pollution flashover occurs:
if the first uniform creepage ratio distance is larger than the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the first uniform creepage ratio distance;
if the first uniform creepage ratio distance is smaller than or equal to the second uniform creepage ratio distance, the selected uniform creepage ratio distance is equal to the second uniform creepage ratio distance multiplied by 110%;
when the pollution flashover occurs but the climbing treatment is carried out after the pollution flashover or the pollution flashover does not occur:
if the first uniform creepage ratio distance is larger than the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the first uniform creepage ratio distance;
and if the first uniform creepage ratio distance is smaller than or equal to the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the second uniform creepage ratio distance.
Further preferably, the insulation configuration of the device to be evaluated in step S5 is equal to the product of the selected uniform creepage distance and the highest operating phase voltage of the corresponding voltage class of the device to be evaluated at the point to be evaluated.
Further preferably, the method also comprises the steps of providing configuration suggestions aiming at the equipment to be evaluated with flashover risks,
e: when the object to be evaluated is a non-suspension disc insulator, the configuration suggestion at least comprises the creepage distance which needs to be increased for the equipment to be evaluated;
the creepage distance that needs to be increased is the difference between the proposed insulation configuration in the device to be evaluated and the actual creepage distance.
f: if the object to be evaluated is the suspension type disc insulator, the configuration suggestion comprises the number of the suspension type disc insulators of the same type which need to be increased when the operation requirement is met and the minimum creepage distance of the suspension type disc insulator with the same structure height which needs to be replaced;
N＝[(L4-L3)/L0]
wherein N is the number of the same type of suspension disc insulator which needs to be increased when the operation requirement is met, and L is4For the suggested insulating arrangement, L3For the actual creepage distance of the equipment to be evaluated, L0For the creepage distance of the single-chip insulator in actual operation]Represents rounding up;
Lmin＝L4/n
in the formula, LminAnd n is the actual unit number of the suspension disc insulator of the equipment to be evaluated.
The suspension type disc insulator is single-piece, and a plurality of suspension type disc insulators are connected into a string to form an insulator string, namely equipment to be evaluated.
Further preferably, in step S5, the insulation configuration of the device to be evaluated is equal to the product of the selected uniform creepage distance and the highest running phase voltage of the voltage class corresponding to the device to be evaluated at the point to be evaluated;
and the selected uniform creepage ratio distance is a first uniform creepage ratio distance or a second uniform creepage ratio distance.
Further preferably, the obtaining procedure of the first additional salt deposit density in step S1 is as follows:
firstly, inquiring a power grid corrosion distribution diagram to obtain the corrosion grade of a point to be evaluated or measuring the corrosion grade of the point to be evaluated on site;
and secondly, acquiring a first additional salt density of the corrosion product based on the corrosion grade of the point to be evaluated and a relation curve of the corrosion grade and the equivalent salt density.
Further preferably, the process of obtaining the equivalent salt deposit density and the equivalent ash density in step S1 is as follows:
firstly, identifying whether historical dry pollution measured value data of a point to be evaluated exist or not, and if so, acquiring the historical measured values of the latest equivalent salt deposit density and equivalent ash density;
the historical dry pollution measurement values comprise historical measurement values of equivalent salt deposit density and equivalent ash density;
if the electric power pollution degree distribution graph does not exist, the electric power pollution degree distribution graph is inquired to obtain the pollution grade of the point to be evaluated, then the middle value of the salt density value in the pollution degree interval where the pollution grade is located is used as the equivalent salt attached density based on the relation graph of the on-site pollution degree of the insulator and the grade and the equivalent salt density/ash density, and the upper limit value of the ash density value in the pollution degree interval where the pollution grade is located is used as the equivalent ash density.
The graph of the field pollution degree of the insulator and the relation between the grade and the equivalent salt density/ash density is known and is in the standard IEC60815 and QGDW 1152.1.
Further preferably, the relationship between the PH value and the conductivity of the rainwater in step S2 is as follows:
γ＝13423.01exp(-1.225pH)+349.6。
further preferably, in step S3, the method for obtaining the checked filthy degree grade includes: and inquiring the pollution degree grades corresponding to the checked salt density and the equivalent ash density based on a relational graph of the pollution degree grade of the insulator site and the equivalent salt density/ash density, wherein the inquired pollution degree grade is the checked pollution degree grade.
Further preferably, in step S4, the first uniform creepage ratio distance obtaining method is: and inquiring a uniform creepage ratio distance corresponding to the checking pollution degree grade of the point to be evaluated based on a relation graph of the uniform creepage ratio distance and the field pollution degree, wherein the inquired uniform creepage ratio distance is the first uniform creepage ratio distance of the insulator.
Advantageous effects
1. The influence of corrosion products is considered, and a first additional salt density is obtained according to the corrosion grade of a point to be evaluated; meanwhile, the influence of acid rain is considered, a second additional salt density is obtained according to the PH value of the rainwater at the point to be evaluated, then the sum of the first additional salt density, the second additional salt density and the equivalent additional salt density is used for obtaining a check salt density of the point to be evaluated, the obtained check salt density is obtained by simultaneously considering corrosion products, acid rain and dry settlement pollution, and then the check salt density is used for carrying out pollution flashover evaluation, so that the obtained evaluation result is more reliable, especially for an acid rain area, the evaluation result is more consistent with the actual situation, the evaluation level of insulator flashover risk in the acid rain area can be improved, and the corrosion flashover trip rate is reduced.
2. When the creepage distance (insulation configuration) suggested by the point to be evaluated is obtained, the method also takes historical operation experience data of the point to be evaluated into consideration, namely, a second uniform creepage ratio distance of the insulator of the point to be evaluated is extracted from a pre-stored ledger library, the second uniform creepage ratio distance is compared with a first uniform creepage ratio distance to select the uniform creepage ratio distance, and the selected uniform creepage ratio distance is at least larger than or equal to the maximum value of the first uniform creepage ratio distance and the second uniform creepage ratio distance, so that the obtained insulation configuration is more reliable.
3. The method can greatly reduce the workload of operators and improve the safe operation and maintenance level of equipment.
Drawings
FIG. 1 is a flow chart of a method for assessing risk of insulator corrosive flashover according to the present invention;
FIG. 2 is a graph of corrosion grade versus equivalent salt deposit density;
FIG. 3 is a graph showing the relationship between the field contamination degree and the grade of the insulator and the equivalent salt density/ash density;
FIG. 4 is a graph of pH versus conductivity γ;
FIG. 5 is a graph of the relationship between the uniform creepage ratio distance and the field filth degree.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention provides an insulator corrosive flashover risk assessment method which can improve the insulator flashover risk assessment level in an acid rain area, greatly reduce the workload of operation and maintenance personnel and improve the safe operation and maintenance level of equipment. As shown in fig. 1, the method for assessing risk of insulator corrosive flashover in this embodiment includes the following steps:
1) and inquiring the power grid corrosion distribution map to obtain the corrosion grade of the point to be evaluated or measuring the corrosion grade of the point to be evaluated on site, and then obtaining a first additional salt deposit density 1 of the corrosion product based on the corrosion grade of the point to be evaluated and a relation curve of the corrosion grade and the equivalent additional salt deposit density.
The corrosion grade of the point to be evaluated and a relation curve of the corrosion grade and the equivalent salt deposit density are shown in FIG. 2, and the relation curve is an existing relation obtained by a laboratory test. And substituting the corrosion grade of the point to be evaluated into the relation curve to obtain a corresponding first additional salt deposit density 1.
2) And inquiring the power pollution area distribution map or the historical dry pollution measurement value to determine the pollution level of the point to be evaluated, and obtaining the equivalent salt deposit density and the equivalent ash density based on the dry deposition pollution.
The value-taking principle is as follows: if the power pollution area distribution map and the historical dry pollution measured value exist, the historical dry pollution measured value is taken as a standard; if the historical dry pollution measurement value is inquired, the equivalent salt deposit density and the equivalent ash density are the latest historical measurement value; if the power pollution area distribution map is inquired, the equivalent salt deposit density value is obtained according to the relation graph of the pollution degree grade of the insulator site and the equivalent salt deposit density/ash deposit density, the middle value of the salt deposit density value of the pollution degree interval is obtained, and the equivalent ash deposit density value is obtained according to the upper limit value of the pollution degree interval.
The graph of the relation between the field pollution degree of the insulator and the equivalent salt density/ash density is shown in fig. 3, and is in standard IEC60815 and QGDW 1152.1.
3) Inquiring the pH distribution diagram of rainfall in the last year or measuring the pH value of the rainwater on site for 3 times from 11 months to 3 months in the second year every year, taking the average value to determine the pH value of the rainwater at the point to be evaluated, obtaining the conductivity through the relation between the pH value of the rainwater and the conductivity gamma, and obtaining a second additional salt density 2 based on the relation between the additional salt density and the conductivity.
Q2＝α×γ×q
In the formula, Q2For the second additional salt density 2, α is the insulator parameter, γ is the conductivity, and q is the equivalent additional salt density insulator parameter α, which is related to the insulator material and structure and can be obtained through experiments.
The relationship between the PH value of rainwater and the conductivity γ is shown in fig. 4, and the relationship is as follows:
γ＝13423.01exp(-1.225pH)+349.6
4) and synthesizing the first additional salt density 1, the second additional salt density 2 and the equivalent salt density of the point to be evaluated to obtain a check salt density of the point to be evaluated, wherein the check salt density is the first additional salt density 1+ the equivalent salt density + the second additional salt density 2. And then inquiring in a relation graph of the pollution degree and the grade of the insulator on site and the equivalent salt density/ash density according to the salt density and the equivalent gray level to obtain the checked pollution degree grade.
5) And inquiring a uniform creepage ratio distance corresponding to the checking pollution degree grade of the point to be evaluated based on a relation graph of the uniform creepage ratio distance and the field pollution degree, wherein the inquired uniform creepage ratio distance is the first uniform creepage ratio distance of the insulator. Wherein, as shown in fig. 5, the relationship between the uniform creepage specific distance and the field filth degree is shown, and the unit of the uniform creepage specific distance is mm/kV which is in the standard QGDW 1152.1.
6) The insulation configuration of the device under evaluation is determined.
And extracting a second uniform creepage ratio distance of the insulator of the point to be evaluated from a pre-stored standing book library, and selecting the uniform creepage ratio distance according to the first uniform creepage ratio distance and the second uniform creepage ratio distance to suggest insulation configuration.
The line equipment ledger library is stored in each unit, for example, a system PMS of a national network, and all parameter information of all equipment stored in the ledger library can be directly inquired and exported.
Specifically, the process of obtaining the second uniform creepage ratio distance and the rule of selecting the uniform creepage ratio distance are as follows:
firstly, calling historical operation experience data of a point to be evaluated to judge whether pollution flashover occurs in a historical time period;
1. if the insulator is not subjected to the over-creepage treatment after the occurrence of the pollution flashover, the second unified creepage specific distance is a prestored unified creepage specific distance of the insulator which is not subjected to the pollution flashover treatment in the standing book library;
at the moment, if the first uniform creepage ratio distance is larger than the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the first uniform creepage ratio distance;
and if the first uniform creepage ratio distance is less than or equal to the second uniform creepage ratio distance, the selected uniform creepage ratio distance is equal to the second uniform creepage ratio distance multiplied by 110%.
2. If the insulator is subjected to the over-creeping treatment after the pollution flashover happens, the second uniform creepage specific distance is the uniform creepage specific distance of the treated insulator in the pre-stored standing book library;
at the moment, if the first uniform creepage ratio distance is larger than the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the first uniform creepage ratio distance;
and if the first uniform creepage ratio distance is smaller than or equal to the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the second uniform creepage ratio distance.
3. If the pollution flashover does not occur, the second unified creepage ratio distance is a prestored unified creepage ratio distance of the insulators recorded in the machine account library;
if the first uniform creepage ratio distance is larger than the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the first uniform creepage ratio distance;
and at the moment, if the first uniform creepage ratio distance is smaller than or equal to the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the second uniform creepage ratio distance.
And defining the creepage distance required by the equipment to be evaluated to meet the safe operation as insulation configuration, wherein the creepage distance is equal to the highest operation phase voltage of the voltage grade corresponding to the equipment to be evaluated at the selected uniform creepage ratio distance multiplied by the point to be evaluated.
7) And calling a standing book of the equipment to be evaluated at the point to be evaluated of the operating unit, wherein the standing book comprises information such as the creepage distance and the product model of the equipment, and the actual creepage distance of the equipment to be evaluated in the standing book is defined as a standing book value. And comparing the standing book value with the suggested insulation configuration, if the standing book value is not less than the suggested insulation configuration, considering that the insulation configuration of the equipment to be evaluated meets the requirement, and if the evaluation result is qualified, and enumerating the information of the qualified equipment. And if the standing account value is less than the suggested insulation configuration, the insulation configuration of the equipment to be evaluated is considered not to meet the requirement, the evaluation result is unqualified, and flashover risk exists.
8) And providing configuration suggestions aiming at the equipment with unqualified evaluation results.
When the object to be evaluated is a non-suspension disc insulator, the configuration suggestion comprises the creepage distance which needs to be increased by the equipment to be evaluated, and the difference value of the creepage distance which needs to be increased is the suggested insulation configuration-standing book value.
If the evaluation object is a suspension type disc insulator, two suggestions are given: the method comprises the steps of firstly, meeting the operation requirement, needing to increase the number of the suspension type disc insulators of the same type, and secondly, meeting the operation requirement, needing to replace the minimum creepage distance of the suspension type disc insulators with the same structure and height.
①：N＝[(L4-L3)/L0]
Wherein N is the number of the same type of suspension disc insulator which needs to be increased when the operation requirement is met, and L is4For the suggested insulating arrangement, L3For the actual creepage distance (ledger value) of the device to be evaluated, L0For the creepage distance of the single-chip insulator in actual operation]Indicating rounding up.
②：Lmin＝L4/n
In the formula, LminAnd n is the actual unit number of the suspension disc insulator of the equipment to be evaluated.
Through the method, the invention provides a brand new method for realizing the insulator corrosive flashover risk assessment, two additional salt density influences are added, the influences of corrosion products and acid rain are considered compared with the existing method, the insulator flashover risk assessment level is improved, especially aiming at an acid rain area, and then the corrosive flashover trip rate can be effectively reduced.
It should be emphasized that the examples described herein are illustrative and not restrictive, and thus the invention is not to be limited to the examples described herein, but rather to other embodiments that may be devised by those skilled in the art based on the teachings herein, and that various modifications, alterations, and substitutions are possible without departing from the spirit and scope of the present invention.
Claims (10)
1. The method for evaluating the risk of corrosive flashover of the insulator is characterized by comprising the following steps of: the method comprises the following steps:
s1: acquiring a first additional salt density of a corrosion product based on the corrosion grade of the point to be evaluated, and acquiring an equivalent additional salt density and an equivalent ash density based on the pollution grade of the point to be evaluated;
s2: obtaining the conductivity by utilizing the PH value of the rainwater at the point to be evaluated, and obtaining a second additional salt density of the acid rainwater based on the conductivity and the equivalent salt density;
Q2＝α×γ×q
in the formula, Q2As a second additional salt density, alphaThe insulator parameters are shown, gamma is the conductivity, and q is the equivalent salt deposit density;
s3: calculating the sum of the first additional salt density, the second additional salt density and the equivalent additional salt density to obtain a checking salt density of the point to be evaluated, and then obtaining a checking filth degree grade of the point to be evaluated based on the checking salt density and the equivalent ash density;
s4: obtaining a first uniform creepage ratio distance of the insulator based on a creepage ratio distance method and the dirt degree grade of the point to be evaluated;
s5: determining the insulation configuration of equipment to be evaluated;
extracting a second uniform creepage ratio distance of the insulator of the point to be evaluated from a pre-stored standing book library, and selecting the uniform creepage ratio distance according to the first uniform creepage ratio distance and the second uniform creepage ratio distance to suggest insulation configuration;
the selected creepage ratio distance is at least larger than or equal to the maximum value of the first uniform creepage ratio distance and the second uniform creepage ratio distance, and the insulation configuration is the creepage distance calculated according to the selected creepage ratio distance;
s6: acquiring the actual creepage distance of the equipment to be evaluated from the ledger of the equipment to be evaluated at the point to be evaluated, and comparing the actual creepage distance of the equipment to be evaluated with the suggested insulation configuration to obtain a flashover risk evaluation result of the equipment to be evaluated;
c: the actual creepage distance of the equipment to be evaluated is greater than or equal to the suggested insulation configuration, and the insulation configuration of the equipment to be evaluated meets the requirement;
d: the actual creepage distance of the equipment to be evaluated is smaller than the suggested insulation configuration, the insulation configuration of the equipment to be evaluated does not meet the requirements, and flashover risks exist.
2. The method of claim 1, wherein: the second uniform creepage ratio distance obtaining process in step S5 is as follows:
calling historical operation experience data of a point to be evaluated to judge whether pollution flashover occurs in a historical time period;
if the insulator is not subjected to the over-creepage treatment after the occurrence of the pollution flashover, the second unified creepage specific distance is a prestored unified creepage specific distance of the insulator which is not subjected to the pollution flashover treatment in the standing book library;
if the insulator is subjected to the over-creeping treatment after the pollution flashover happens, the second uniform creepage specific distance is the uniform creepage specific distance of the treated insulator in the pre-stored standing book library;
and if the pollution flashover does not occur, the second uniform creepage ratio distance is the uniform creepage ratio distance of the insulators recorded in the pre-stored standing book library.
3. The method of claim 2, wherein: the rule for selecting the uniform creepage ratio distance in step S5 is as follows:
when the insulator is not subjected to creeping treatment after pollution flashover occurs:
if the first uniform creepage ratio distance is larger than the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the first uniform creepage ratio distance;
if the first uniform creepage ratio distance is smaller than or equal to the second uniform creepage ratio distance, the selected uniform creepage ratio distance is equal to the second uniform creepage ratio distance multiplied by 110%;
when the pollution flashover occurs but the climbing treatment is carried out after the pollution flashover or the pollution flashover does not occur:
if the first uniform creepage ratio distance is larger than the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the first uniform creepage ratio distance;
and if the first uniform creepage ratio distance is smaller than or equal to the second uniform creepage ratio distance, the selected uniform creepage ratio distance is the second uniform creepage ratio distance.
4. A method according to claim 2 or 3, characterized in that: in step S5, the insulation configuration of the device to be evaluated is equal to the product of the selected uniform creepage distance and the highest running phase voltage of the voltage class corresponding to the device to be evaluated at the point to be evaluated.
5. The method of claim 1, wherein: further comprising providing configuration suggestions for the devices to be evaluated at risk of flashover,
e: when the object to be evaluated is a non-suspension disc insulator, the configuration suggestion at least comprises the creepage distance which needs to be increased for the equipment to be evaluated;
the creepage distance to be increased is the difference value between the insulation configuration suggested in the equipment to be evaluated and the actual creepage distance;
f: if the object to be evaluated is the suspension type disc insulator, the configuration suggestion comprises the number of the suspension type disc insulators of the same type which need to be increased when the operation requirement is met and the minimum creepage distance of the suspension type disc insulator with the same structure height which needs to be replaced;
N＝[(L4-L3)/L0]
wherein N is the number of the same type of suspension disc insulator which needs to be increased when the operation requirement is met, and L is4For the suggested insulating arrangement, L3For the actual creepage distance of the equipment to be evaluated, L0For the creepage distance of the single-chip insulator in actual operation]Represents rounding up;
Lmin＝L4/n
in the formula, LminAnd n is the actual unit number of the suspension disc insulator of the equipment to be evaluated.
6. The method of claim 1, wherein: the first additional salt deposit density in step S1 is obtained as follows:
firstly, inquiring a power grid corrosion distribution diagram to obtain the corrosion grade of a point to be evaluated or measuring the corrosion grade of the point to be evaluated on site;
and secondly, acquiring a first additional salt density of the corrosion product based on the corrosion grade of the point to be evaluated and a relation curve of the corrosion grade and the equivalent salt density.
7. The method of claim 1, wherein: the process of obtaining the equivalent salt deposit density and the equivalent ash density in step S1 is as follows:
firstly, identifying whether historical dry pollution measured value data of a point to be evaluated exist or not, and if so, acquiring the historical measured values of the latest equivalent salt deposit density and equivalent ash density;
the historical dry pollution measurement values comprise historical measurement values of equivalent salt deposit density and equivalent ash density;
if the electric power pollution degree distribution graph does not exist, the electric power pollution degree distribution graph is inquired to obtain the pollution grade of the point to be evaluated, then the middle value of the salt density value in the pollution degree interval where the pollution grade is located is used as the equivalent salt attached density based on the relation graph of the on-site pollution degree of the insulator and the grade and the equivalent salt density/ash density, and the upper limit value of the ash density value in the pollution degree interval where the pollution grade is located is used as the equivalent ash density.
8. The method of claim 1, wherein: the relationship between the PH value and the conductivity of the rainwater in step S2 is as follows:
γ＝13423.01exp(-1.225pH)+349.6。
9. the method of claim 1, wherein: in step S3, the method for obtaining the dirt degree rating is: and inquiring the pollution degree grades corresponding to the checked salt density and the equivalent ash density based on a relational graph of the pollution degree grade of the insulator site and the equivalent salt density/ash density, wherein the inquired pollution degree grade is the checked pollution degree grade.
10. The method of claim 1, wherein: in step S4, the first uniform creepage ratio distance obtaining method is: and inquiring a uniform creepage ratio distance corresponding to the checking pollution degree grade of the point to be evaluated based on a relation graph of the uniform creepage ratio distance and the field pollution degree, wherein the inquired uniform creepage ratio distance is the first uniform creepage ratio distance of the insulator.
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