CN109087029A - A kind of insulator corrosivity flashover methods of risk assessment - Google Patents
A kind of insulator corrosivity flashover methods of risk assessment Download PDFInfo
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- 239000012212 insulator Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 39
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- 239000002351 wastewater Substances 0.000 claims abstract description 132
- 150000003839 salts Chemical class 0.000 claims abstract description 96
- 238000009413 insulation Methods 0.000 claims abstract description 44
- 238000005260 corrosion Methods 0.000 claims abstract description 40
- 230000007797 corrosion Effects 0.000 claims abstract description 40
- 238000003916 acid precipitation Methods 0.000 claims abstract description 25
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- 239000003337 fertilizer Substances 0.000 claims description 5
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- 230000009194 climbing Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000000469 dry deposition Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 3
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Abstract
The invention discloses a kind of insulator corrosivity flashover methods of risk assessment, comprising: the first additional salt that the corrosion class based on point to be assessed obtains corrosion product is close, and the gradation for surface pollution based on point to be assessed obtains equivalent salt deposit density and equivalent ash is close；The second additional salt for obtaining acid rain using the rainwater pH value of point to be assessed is close；It calculates that the first additional salt is close, the second additional salt is close and the sum of equivalent salt deposit density obtains that the check salt to be assessed selected is close, then based on checking the close check pollution degree grade for obtaining point to be assessed of the close and equivalent ash of salt；First unified retting-flax wastewater of insulator is obtained based on pollution degree grade is checked；Determine the insulation configuration of equipment to be assessed；The practical creepage distance of equipment to be assessed is obtained from the account of equipment to be assessed from point to be assessed, and the flashover risk evaluation result for obtaining equipment to be assessed is compared with the insulation configuration of suggestion for the practical creepage distance according to equipment to be assessed.This method considers the influence of acid rain and corrosion product to flashover.
Description
Technical field
The invention belongs to electric power project engineering fields, and in particular to a kind of insulator corrosivity flashover methods of risk assessment.
Background technique
About 690,000 km of China Acid Rain Zone2, covering East China, south China and southwest.Acid rain exacerbates the dirt of insulator surface
Dirty deposition, and make the corrosion generation of its metal parts that can be settled down to a variety of chemical substances such as liquid and dust of insulator surface, it shows
Writing reduces insulator electric property.The foundation of China's power grid antifouling work is the site pollution degree i.e. measurement knot of dry deposition object at present
Fruit does not consider the influence of acid rain and metal component corrosion product, and acid rain and corrosion product randomness are strong, it is difficult to track.It is based on
Even if the Insulation Coordination of site pollution degree meets regulatory requirements, due to do not consider acid rain itself, metal component corrosion product etc. because
Element, it would still be possible to flashover occur.However, existing flashover methods of risk assessment is also based on measurement result or the dirt area of dry deposition object
Distribution map does not consider the influence of acid rain and corrosion product, therefore the reliability in the existing flashover methods of risk assessment in Acid Rain Zone has
Limit, the accuracy of obtained assessment result are to be improved.
Wherein, corrosivity flashover is defined as: will 1. acid rain directly caused by flashover, 2. shaft tower, fitting, insulator cap steel
Flashover caused by foot etc. corrodes, and 3. flashover caused by acid rain, corrosion product and former dry pollution layer compound action.
Summary of the invention
The purpose of the present invention is the measurement result or polluted area distribution of dry deposition object are only considered for existing flashover appraisal procedure
The problem for scheming and not considering acid rain and corrosion product and causing the accuracy of assessment result to be improved provides a kind of completely new insulation
Sub- corrosivity flashover methods of risk assessment considers the influence of acid rain and corrosion product to flashover, improves Acid Rain Zone insulation
Sub- flashover risk assessment is horizontal.A kind of insulator corrosivity flashover methods of risk assessment, includes the following steps:
S1: the first additional salt that the corrosion class based on point to be assessed obtains corrosion product is close, and is based on point to be assessed
Gradation for surface pollution obtain equivalent salt deposit density and equivalent ash is close；
S2: conductivity is obtained using the rainwater pH value of point to be assessed, then is obtained based on conductivity and equivalent salt deposit density
Second additional salt of acid rain is close；
Q2=α × γ × q
In formula, Q2Close for the second additional salt, α is insulation subparameter, and γ is conductivity, and q is equivalent salt deposit density；
S3: calculating that first additional salt is close, second additional salt is close and the sum of equivalent salt deposit density obtain it is to be evaluated
Estimate that the check salt selected is close, then based on the close and described equivalent close check pollution degree grade for obtaining point to be assessed of ash of the check salt；
S4: obtain insulator first of the check pollution degree grade based on retting-flax wastewater method and point to be assessed uniformly climbs
Electricity than away from；
S5: the insulation configuration of equipment to be assessed is determined；
Wherein, second unified retting-flax wastewater of the insulator of point to be assessed, and foundation are extracted from the account library prestored
Described first unified retting-flax wastewater chooses unified retting-flax wastewater with described second unified retting-flax wastewater and carrys out suggestion insulation configuration；
The retting-flax wastewater of selection is at least greater than or equal in first unified retting-flax wastewater and second unified retting-flax wastewater
Maximum value, the insulation configuration be according to choose retting-flax wastewater calculate creepage distance；
S6: the practical creepage distance of equipment to be assessed, and foundation are obtained from the account of equipment to be assessed from point to be assessed
The flashover risk assessment for obtaining equipment to be assessed is compared with the insulation configuration of suggestion for the practical creepage distance of equipment to be assessed
As a result；
C: the practical creepage distance of equipment to be assessed is greater than or equal to the insulation configuration suggested, the insulation of equipment to be assessed is matched
It sets and meets the requirements；
D: the practical creepage distance of equipment to be assessed is less than the insulation configuration suggested, the insulation configuration of equipment to be assessed is discontented
Foot requires, and there are flashover risks.
The present invention considers the influence of corrosion product, and then the corrosion class according to point to be assessed obtains the first additional salt
It is close；Consider the influence of acid rain simultaneously, and then to get the second additional salt close for the rainwater pH value according to point to be assessed, it is subsequent and will
First additional salt is close, the second additional salt is close and the sum of equivalent salt deposit density to obtain the check salt to be assessed selected close, make
It checks that salt is close to be considered corrosion product, acid rain and dry deposition filth simultaneously and obtain, recycles and check that salt is close to carry out dirt
Assessment is deleted, the assessment result made is relatively reliable, in particular for Acid Rain Zone, more matches with actual conditions.
In addition, when the present invention obtains creepage distance (insulation configuration) suggested at point to be assessed, also based in view of to be evaluated
A history run empirical data at estimating, i.e., second that the insulator of point to be assessed is extracted from the account library prestored uniformly climb
It than away from being compared with first unified retting-flax wastewater and select unified retting-flax wastewater, and that chooses uniformly climbs electricity by electricity
Than away from first unified retting-flax wastewater and the maximum value in second uniformly retting-flax wastewater is at least greater than or equal to, to make to obtain
Insulation configuration it is relatively reliable.
It should be noted that may exist multiple equipment to be assessed at point to be assessed, the present invention, which first calculates, to be assessed points out insulation
The requirement of equipment, then it is relatively assessed into equipment to be assessed with the presence or absence of pollution flashover wind compared with the actual motion of equipment to be assessed
Danger.
Further preferably, the acquisition process of second unified retting-flax wastewater is as follows in step S5:
The history run empirical data of point to be assessed is transferred to judge whether historical period occurred pollution flashover；
If occurring and insulator after pollution flashover occurs not carrying out toning to climb improvement, described second unified retting-flax wastewater is pre-
Pollution flashover does not administer the unified retting-flax wastewater of insulator in the account library deposited；
If occurring but carrying out toning after pollution flashover to climb improvement, described second unified retting-flax wastewater is in the account library prestored
The unified retting-flax wastewater of insulator after improvement；
If pollution flashover did not occurred, described second unified retting-flax wastewater is the system for the insulator recorded in the account library prestored
One retting-flax wastewater.
The present invention identifies whether that pollution flashover occurred according to history data, and then according to whether pollution flashover occurs to determine
How second unified retting-flax wastewater determines, so that the insulation configuration being further ensured that is more to meet actual requirement.
Further preferably, the rule that unified retting-flax wastewater is chosen in step S5 is as follows:
When insulator after pollution flashover occurs not carrying out toning and climb improvement:
If first unified unified retting-flax wastewater of retting-flax wastewater > the second, the unified retting-flax wastewater of selection is first system
One retting-flax wastewater；
If first unified unified retting-flax wastewater of retting-flax wastewater≤the second, the unified retting-flax wastewater of selection are equal to second
Unified retting-flax wastewater is multiplied by 110%；
Occur to carry out after pollution flashover but pollution flashover toning and climb improvement or when there is no crossing pollution flashover:
If first unified unified retting-flax wastewater of retting-flax wastewater > the second, the unified retting-flax wastewater of selection is first system
One retting-flax wastewater；
If first unified unified retting-flax wastewater of retting-flax wastewater≤the second, the unified retting-flax wastewater of selection is second system
One retting-flax wastewater.
Further preferably, in step S5 the insulation configuration of equipment to be assessed be equal to the unified retting-flax wastewater of selection with it is to be assessed
The highest that point locates equipment corresponding voltage grade to be assessed runs the product of phase voltage.
It further preferably, further include being directed to provide to configure there are the equipment to be assessed of flashover risk to suggest,
E: when the object to be assessed is non-suspension type disc insulator, the configuration suggests that including at least equipment to be assessed needs
Want increased creepage distance；
Wherein, needing increased creepage distance is the insulation configuration suggested in equipment to be assessed and the difference of practical creepage distance
Value.
F: if object to be assessed is suspension type disc insulator, the configuration suggests including needing to increase when meeting service requirement
The piece number of the same model suspension type disc insulator added and the minimum for needing to change same structure height suspension type disc insulator climb electricity away from
From；
N=[(L4-L3)/L0]
In formula, N is the piece number that increased same model suspension type disc insulator is needed when meeting service requirement, L4For suggestion
Insulation configuration, L3For the practical creepage distance of equipment to be assessed, L0For the creepage distance of monolithic insulator in actual motion, [] is indicated
It rounds up；
Lmin=L4/n
In formula, LminThe minimum creep distance of same structure height suspension type disc insulator is needed to change when to meet service requirement,
N is the actual unit number of equipment suspension type disc insulator to be assessed.
Suspension type disc insulator is monolithic, and multiple suspension type disc insulators string, and to form insulator chain i.e. to be assessed
Equipment.
Further preferably, in step S5 the insulation configuration of equipment to be assessed be equal to the unified retting-flax wastewater of selection with it is to be assessed
The highest that point locates equipment corresponding voltage grade to be assessed runs the product of phase voltage；
Wherein, the unified retting-flax wastewater selected is the first unified retting-flax wastewater or the second unified retting-flax wastewater.
Further preferably, the close acquisition process of the first additional salt described in step S1 is as follows:
Firstly, inquiry power grid corrodes distribution map to obtain the corrosion class or in-site measurement point to be assessed at point to be assessed
Corrosion class；
Secondly, corrosion class and corrosion class-equivalent salt deposit density relation curve based on point to be assessed obtain corruption
The first additional salt for losing product is close.
Further preferably, equivalent salt deposit density described in step S1 and equivalent grey close acquisition process are as follows:
Firstly, recognizing whether the dry pollution measurement Value Data of the history of point to be assessed, and if it exists, obtain the last time
Equivalent salt deposit density and equivalent grey close historical measurements；
The dry pollution measurement value of history includes equivalent salt deposit density and equivalent grey close historical measurements；
If it does not exist, electric power fertilizer making by sludge is inquired to obtain the gradation for surface pollution of point to be assessed, then is based on insulator site
Pollution degree and grade and the close relational graph of equivalent salt density/ash are by salt density value median in the pollution degree section of the gradation for surface pollution place
It is close as equivalent ash as equivalent salt deposit density, and using the close upper limit value of ash in place pollution degree section.
Insulator site pollution degree and grade and the close relational graph of equivalent salt density/ash are known contents, in standard
In IEC60815 and QGDW1152.1.
Further preferably, the relationship of step S2 moderate rain water ph value and conductivity is as follows:
γ=13423.01exp (- 1.225pH)+349.6.
Further preferably, the acquisition modes of pollution degree grade are checked described in step S3 are as follows: be based on insulator site pollution
It spends grade and inquires the close corresponding pollution degree grade of the close and equivalent ash of check salt, inquiry with the close relational graph of equivalent salt density/ash
The pollution degree grade arrived is to check pollution degree grade.
Further preferably, the acquisition modes of first unified retting-flax wastewater described in step S4 are as follows: based on uniformly climbing electric ratio
Away from the corresponding unified retting-flax wastewater of the check pollution degree grade of inquiring point to be assessed with the relational graph of site pollution degree, inquire
The unified retting-flax wastewater is first unified retting-flax wastewater of the insulator.
Beneficial effect
1, the present invention considers the influence of corrosion product, and then the corrosion class according to point to be assessed obtains the first additional salt
It is close；Consider the influence of acid rain simultaneously, and then to get the second additional salt close for the rainwater pH value according to point to be assessed, it is subsequent and will
First additional salt is close, the second additional salt is close and the sum of equivalent salt deposit density to obtain the check salt to be assessed selected close, make
It checks that salt is close to be considered corrosion product, acid rain and dry deposition filth simultaneously and obtain, recycles and check that salt is close to carry out dirt
Assessment is dodged, the assessment result made is relatively reliable, in particular for Acid Rain Zone, more matches with actual conditions, acid can be improved
Rain belt insulator arc-over risk assessment is horizontal, reduces corrosivity flashover trip-out rate.
2, when the present invention obtains creepage distance (insulation configuration) suggested at point to be assessed, also based in view of point to be assessed
The history run empirical data at place, i.e., second that the insulator of point to be assessed is extracted from the account library prestored uniformly climb electric ratio
Away from, it is compared with first unified retting-flax wastewater and selects unified retting-flax wastewater, and the unified retting-flax wastewater of selection
The maximum value being at least greater than or equal in first unified retting-flax wastewater and second unified retting-flax wastewater, so that is made is exhausted
Edge configuration is relatively reliable.
3, the workload of operations staff can be greatly reduced using the method for the invention, it is horizontal to improve equipment safety O&M.
Detailed description of the invention
Fig. 1 is a kind of flow chart of insulator corrosivity flashover methods of risk assessment of the present invention；
Fig. 2 is corrosion class-equivalent salt deposit density relation curve；
Fig. 3 is insulator site pollution degree and grade and the close relational graph of equivalent salt density/ash；
Fig. 4 is the relational graph of pH value and conductivity gamma；
Fig. 5 is the relational graph of unified retting-flax wastewater and site pollution degree.
Specific embodiment
Below in conjunction with embodiment, the present invention is described further.
The present invention provides a kind of insulator corrosivity flashover methods of risk assessment, not only can be improved using the appraisal procedure
Acid Rain Zone insulator arc-over risk assessment is horizontal, and the workload of operation maintenance personnel can also be greatly reduced, and improves equipment safety O&M
It is horizontal.Wherein, as shown in Figure 1, a kind of insulator corrosivity flashover methods of risk assessment in the present embodiment, includes the following steps:
1) inquiry power grid corrosion distribution map obtains corrosion class at point to be assessed or in-site measurement point to be assessed
Corrosion class, then the corrosion class based on point to be assessed and corrosion class-equivalent salt deposit density relation curve obtain corrosion
The first additional salt close 1 of product.
Wherein, the corrosion class of point to be assessed and corrosion class-equivalent salt deposit density relation curve as shown in Fig. 2,
The relation curve is the existing relationship that laboratory test obtains.The corrosion class of point to be assessed, which is substituted into the relation curve, to be obtained
To corresponding first additional salt close 1.
2) it inquires electric power fertilizer making by sludge or the dry pollution measurement value of history determines the gradation for surface pollution of point to be assessed, be based on
The equivalent salt deposit density of dry deposition filth and equivalent ash are close.
Value principle are as follows: if both there is electric power fertilizer making by sludge and the dry pollution measurement value of history, then with the dry dirt of history
Subject to dirty measured value；Wherein, if the dry pollution measurement value of query history, then equivalent salt deposit density and equivalent ash is close takes the last time
Historical measurements；If inquiring electric power fertilizer making by sludge, equivalent salt deposit density value is then according to insulator site pollution degree grade
The median of the pollution degree section salt density value, equivalent ash Mi Zhiqugai pollution degree area are taken in close relational graph with equivalent salt density/ash
Between upper limit value.
Wherein, the insulator site pollution degree relational graph close with equivalent salt density/ash with grade is as shown in figure 3, it is being marked
In quasi- IEC60815 and QGDW1152.1.
3) prior year precipitation pH distribution map or annual November are inquired to in-site measurement rainwater pH value 3 times between second year March simultaneously
It is averaged the pH value for determining to be assessed rainwater, conductivity is obtained by the relationship of rainwater pH value and conductivity gamma, then be based on
The close relationship with conductivity of additional salt obtains the second additional salt close 2.
Q2=α × γ × q
In formula, Q2It is insulation subparameter for close 2, the α of the second additional salt, γ is conductivity, and q is equivalent salt deposit density insulator
Parameter alpha is related with insulator material and structure, is that can be obtained by test.
Wherein the relationship of rainwater pH value and conductivity gamma is as shown in figure 4, its relational expression is as follows:
γ=13423.01exp (- 1.225pH)+349.6
4) close 1, second additional salt close 2 of the first additional salt and equivalent salt deposit density of comprehensive point to be assessed, obtains to be assessed
Select check salt it is close, wherein check salt it is close=close the+the second additional salt of 1+ equivalent salt deposit density close 2 of the first additional salt.Then root then,
It inquires and obtains in the insulator site pollution degree relational graph close with equivalent salt density/ash with grade according to the check close and equivalent gray scale of salt
Check pollution degree grade.
5) relational graph based on unified retting-flax wastewater and site pollution degree inquires the check pollution degree grade pair of point to be assessed
The unified retting-flax wastewater answered, the unified retting-flax wastewater inquired are first unified retting-flax wastewater of the insulator.Its
In, it is illustrated in figure 5 the relational graph of unified retting-flax wastewater and site pollution degree, the unit of unified retting-flax wastewater is mm/kV,
In standard QGDW1152.1.
6) insulation configuration of equipment to be assessed is determined.
Wherein, second unified retting-flax wastewater of the insulator of point to be assessed, and foundation are extracted from the account library prestored
Described first unified retting-flax wastewater chooses unified retting-flax wastewater with described second unified retting-flax wastewater and carrys out suggestion insulation configuration.
Line facility account library is deposited in each unit, such as the system PMS of state's net deposits institute in the account library
Having the parameter information of equipment all can directly inquire, export.
Specifically, second is unified the acquisition process of retting-flax wastewater and chooses the regular as follows of unified retting-flax wastewater:
Firstly, transferring the history run empirical data of point to be assessed to judge whether historical period occurred pollution flashover；
If 1, occurring and insulator after pollution flashover occurs not carrying out toning to climb improvement, described second unified retting-flax wastewater is
Pollution flashover does not administer the unified retting-flax wastewater of insulator in the account library prestored；
At this point, if first unified unified retting-flax wastewater of retting-flax wastewater > the second, the unified retting-flax wastewater of selection is first
A unified retting-flax wastewater；
If first unified unified retting-flax wastewater of retting-flax wastewater≤the second, the unified retting-flax wastewater of selection are equal to second
Unified retting-flax wastewater is multiplied by 110%.
If 2, occurring but carrying out toning after pollution flashover to climb improvement, described second unified retting-flax wastewater is the account library prestored
The unified retting-flax wastewater of insulator after middle improvement；
At this point, if first unified unified retting-flax wastewater of retting-flax wastewater > the second, the unified retting-flax wastewater of selection is first
A unified retting-flax wastewater；
If first unified unified retting-flax wastewater of retting-flax wastewater≤the second, the unified retting-flax wastewater of selection is second system
One retting-flax wastewater.
If pollution flashover 3, did not occurred, described second unified retting-flax wastewater is the insulator recorded in the account library prestored
Unified retting-flax wastewater；
If first unified unified retting-flax wastewater of retting-flax wastewater > the second, the unified retting-flax wastewater of selection is first system
One retting-flax wastewater；
At this point, if the unified retting-flax wastewater of first unified retting-flax wastewater≤the second, the unified retting-flax wastewater of selection is the
Two unified retting-flax wastewaters.
Wherein, equipment to be assessed is met safe operation to need that creepage distance is taken to be defined as insulation configuration, is equal to and chooses
Unified retting-flax wastewater multiplied by point to be assessed equipment corresponding voltage grade to be assessed highest run phase voltage.
7) account of run unit point equipment to be assessed to be assessed is transferred, includes the creepage distance and product of equipment in account
The actual creepage distance of equipment to be assessed in account is defined as account value here by the information such as model.By account value and suggestion
Insulation configuration compares, if account value >=suggestion insulation configuration, then it is assumed that apparatus insulated configuration to be assessed is met the requirements, assessment knot
Fruit is qualification, and enumerates approved apparatus information.If the insulation configuration that account value < suggests, then it is assumed that apparatus insulated configuration to be assessed
Be unsatisfactory for requiring, assessment result be it is unqualified, deposit flashover risk.
8) it is underproof equipment for assessment result, configuration is provided and is suggested.
Wherein, for object to be assessed be non-suspension type disc insulator when, configuration suggest include equipment to be assessed need to increase
The creepage distance added needs insulation configuration-account value of increased creepage distance difference=suggestion.
If assessment object is suspension type disc insulator, provides two suggestions: 1. meeting service requirement and need to increase same model
2. the piece number of suspension type disc insulator meets service requirement and needs replacing the minimum of same structure height suspension type disc insulator and climbs electricity
Distance.
1.: N=[(L4-L3)/L0]
In formula, N is the piece number that increased same model suspension type disc insulator is needed when meeting service requirement, L4For suggestion
Insulation configuration, L3For the practical creepage distance of equipment to be assessed (account value), L0For in actual motion monolithic insulator climb electricity away from
From [] expression rounds up.
2.: Lmin=L4/n
In formula, LminThe minimum creep distance of same structure height suspension type disc insulator is needed to change when to meet service requirement,
N is the actual unit number of equipment suspension type disc insulator to be assessed.
By the above method, the present invention provides a kind of completely new methods to realize that insulator corrosivity flashover risk is commented
Estimate, which increase the influences that two additional salts are close, the influence of corrosion product and acid rain is both additionally contemplates that compared to existing method,
It is horizontal to improve insulator arc-over risk assessment, in particular for Acid Rain Zone, and then the tripping of corrosivity flashover can be effectively reduced
Rate.
It is emphasized that example of the present invention be it is illustrative, without being restrictive, thus the present invention it is unlimited
Example described in specific embodiment, other all obtained according to the technique and scheme of the present invention by those skilled in the art
Embodiment does not depart from present inventive concept and range, and whether modification or replacement, also belong to protection model of the invention
It encloses.
Claims (10)
1. a kind of insulator corrosivity flashover methods of risk assessment, characterized by the following steps:
S1: the first additional salt that the corrosion class based on point to be assessed obtains corrosion product is close, and the dirt based on point to be assessed
Dirty grade obtains equivalent salt deposit density and equivalent ash is close；
S2: conductivity is obtained using the rainwater pH value of point to be assessed, then acid rain is obtained based on conductivity and equivalent salt deposit density
The second additional salt it is close；
Q2=α × γ × q
In formula, Q2Close for the second additional salt, α is insulation subparameter, and γ is conductivity, and q is equivalent salt deposit density；
S3: calculating that first additional salt is close, second additional salt is close and the sum of equivalent salt deposit density obtains point to be assessed
Check salt it is close, then based on the close and described equivalent close check pollution degree grade for obtaining point to be assessed of ash of the check salt；
S4: obtain insulator first of the check pollution degree grade based on retting-flax wastewater method and point to be assessed uniformly climbs electric ratio
Away from；
S5: the insulation configuration of equipment to be assessed is determined；
Wherein, second unified retting-flax wastewater of the insulator of point to be assessed is extracted from the account library prestored, and according to described
First unified retting-flax wastewater chooses unified retting-flax wastewater with described second unified retting-flax wastewater and carrys out suggestion insulation configuration；
The retting-flax wastewater of selection is at least greater than or equal in first unified retting-flax wastewater and second unified retting-flax wastewater most
Big value, the insulation configuration are the creepage distance calculated according to the retting-flax wastewater chosen；
S6: the practical creepage distance of equipment to be assessed is obtained from the account of equipment to be assessed from point to be assessed, and according to be evaluated
The flashover risk evaluation result for obtaining equipment to be assessed is compared with the insulation configuration of suggestion for the practical creepage distance for estimating equipment；
C: the practical creepage distance of equipment to be assessed is greater than or equal to the insulation configuration suggested, the insulation configuration of equipment to be assessed is full
Foot requires；
D: the practical creepage distance of equipment to be assessed is less than the insulation configuration suggested, the insulation configuration of equipment to be assessed is unsatisfactory for wanting
It asks, there are flashover risks.
2. according to the method described in claim 1, it is characterized by: in step S5 second unified retting-flax wastewater acquisition process
It is as follows:
The history run empirical data of point to be assessed is transferred to judge whether historical period occurred pollution flashover；
If occurring and insulator after pollution flashover occurs not carrying out toning to climb improvement, described second unified retting-flax wastewater is prestored
Pollution flashover does not administer the unified retting-flax wastewater of insulator in account library；
If occurring but carrying out toning after pollution flashover to climb improvement, described second unified retting-flax wastewater is to administer in the account library prestored
The unified retting-flax wastewater of insulator afterwards；
If pollution flashover did not occurred, described second unified retting-flax wastewater is uniformly climbing for the insulator recorded in the account library prestored
Electricity than away from.
3. according to the method described in claim 2, it is characterized by: the rule for choosing unified retting-flax wastewater in step S5 is as follows:
When insulator after pollution flashover occurs not carrying out toning and climb improvement:
If first unified unified retting-flax wastewater of retting-flax wastewater > the second, the unified retting-flax wastewater of selection are first and uniformly climb
Electricity than away from；
If first unified unified retting-flax wastewater of retting-flax wastewater≤the second, the unified retting-flax wastewater of selection are equal to second unification
Retting-flax wastewater is multiplied by 110%；
Occur to carry out after pollution flashover but pollution flashover toning and climb improvement or when there is no crossing pollution flashover:
If first unified unified retting-flax wastewater of retting-flax wastewater > the second, the unified retting-flax wastewater of selection are first and uniformly climb
Electricity than away from；
If first unified unified retting-flax wastewater of retting-flax wastewater≤the second, the unified retting-flax wastewater of selection are second and uniformly climb
Electricity than away from.
4. according to the method in claim 2 or 3, it is characterised in that: the insulation configuration of equipment to be assessed is equal in step S5
The product of the unified retting-flax wastewater of selection and the highest operation phase voltage of equipment corresponding voltage grade to be assessed at point to be assessed.
5. according to the method described in claim 1, it is characterized by also including for there are the equipment to be assessed of flashover risk to mention
Suggest for configuration,
E: when the object to be assessed is non-suspension type disc insulator, the configuration suggests that including at least equipment to be assessed needs to increase
The creepage distance added；
Wherein, needing increased creepage distance is the insulation configuration suggested in equipment to be assessed and the difference of practical creepage distance.
F: if object to be assessed is suspension type disc insulator, the configuration is suggested increased including needing when meeting service requirement
With model suspension type disc insulator the piece number and need to change the minimum creep distance of same structure height suspension type disc insulator；
N=[(L4-L3)/L0]
In formula, N is the piece number that increased same model suspension type disc insulator is needed when meeting service requirement, L4For the insulation of suggestion
Configuration, L3For the practical creepage distance of equipment to be assessed, L0For the creepage distance of monolithic insulator in actual motion, [] indicates upward
It is rounded；
Lmin=L4/n
In formula, LminThe minimum creep distance of same structure height suspension type disc insulator is needed to change when to meet service requirement, n is
The actual unit number of equipment suspension type disc insulator to be assessed.
6. according to the method described in claim 1, it is characterized by: the close acquisition process of the first additional salt described in step S1 such as
Under:
Firstly, inquiry power grid corrodes distribution map to obtain the corruption of corrosion class or in-site measurement point to be assessed at point to be assessed
Lose grade；
It is produced secondly, corrosion class and corrosion class-equivalent salt deposit density relation curve based on point to be assessed obtain corrosion
First additional salt of object is close.
7. according to the method described in claim 1, it is characterized by: equivalent salt deposit density described in step S1 and equivalent ash are close
Acquisition process is as follows:
Firstly, recognizing whether the dry pollution measurement Value Data of the history of point to be assessed, and if it exists, obtain the last equivalence
Salt density and equivalent grey close historical measurements；
The dry pollution measurement value of history includes equivalent salt deposit density and equivalent grey close historical measurements；
If it does not exist, electric power fertilizer making by sludge is inquired to obtain the gradation for surface pollution of point to be assessed, then is based on insulator site pollution
Degree and grade and the close relational graph of equivalent salt density/ash using salt density value median in the pollution degree section of the gradation for surface pollution place as
Equivalent salt deposit density, and the close upper limit value of ash in place pollution degree section is close as equivalent ash.
8. according to the method described in claim 1, it is characterized by: the relationship of step S2 moderate rain water ph value and conductivity is as follows:
γ=13423.01exp (- 1.225pH)+349.6.
9. according to the method described in claim 1, it is characterized by: checking the acquisition modes of pollution degree grade described in step S3
Are as follows: it is close based on the insulator site pollution degree grade relational graph inquiry check salt close and equivalent ash close with equivalent salt density/ash
Corresponding pollution degree grade, the pollution degree grade inquired are to check pollution degree grade.
10. according to the method described in claim 1, it is characterized by: first unified retting-flax wastewater described in step S4 obtains
Take mode are as follows: the check pollution degree grade that the relational graph based on unified retting-flax wastewater and site pollution degree inquires point to be assessed is corresponding
Unified retting-flax wastewater, the unified retting-flax wastewater inquired is first unified retting-flax wastewater of the insulator.
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