CN102694352B - Method for improving insulator potential distribution in overhead power transmission line - Google Patents
Method for improving insulator potential distribution in overhead power transmission line Download PDFInfo
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- CN102694352B CN102694352B CN201210186198.8A CN201210186198A CN102694352B CN 102694352 B CN102694352 B CN 102694352B CN 201210186198 A CN201210186198 A CN 201210186198A CN 102694352 B CN102694352 B CN 102694352B
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- 239000012212 insulator Substances 0.000 title claims abstract description 183
- 238000009826 distribution Methods 0.000 title claims abstract description 78
- 230000005540 biological transmission Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 61
- 239000005341 toughened glass Substances 0.000 claims abstract description 58
- 238000004458 analytical method Methods 0.000 claims abstract description 47
- 238000004088 simulation Methods 0.000 claims abstract description 46
- 230000005684 electric field Effects 0.000 claims abstract description 14
- 239000006058 strengthened glass Substances 0.000 claims description 18
- 239000004020 conductor Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 238000000205 computational method Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention discloses a method for improving insulator potential distribution in an overhead power transmission line. The method comprises the following steps of: selecting a flashover frequent segment based on the history data of an overhead power transmission line, and selecting a rod tower, a lead, an organic composite insulator and a toughened glass insulator string which are greatly used from the flashover frequent segment; calculating the electric field and potential distribution parameters of the corresponding organic composite insulator and the toughened glass insulator string by utilizing a finite element value calculation method and adopting a three-dimensional finite element model in an ideal clean and dry environment and a filthy and damp environment for simulation analysis; and calling the corresponding potential improvement strategy based on the simulation analysis result... The method provided by the invention can achieve the advantages of high power supply reliability, good safety and good economic benefit of a power grid.
Description
Technical field
The present invention relates to maintenance and the technical field of security and protection of grid power transmission circuit, particularly, relate to the method improving insulator Potential distribution in overhead transmission line, be specially the method improving organic composite insulator and toughened glass insulator string Potential distribution in overhead transmission line under filthy wet environment.
Background technology
In recent years, transmission line, the especially Northwest Grid of each electric pressure in electrical network, repeatedly insulator arc-over trip accident occurs, cause significant impact to mains supply reliability, economic loss is very large; According to flashover fault analysis, the filth that insulator surface is assembled is the one of the main reasons causing flashover, studies insulator Potential distribution, is the effective means of prevention transmission line flashover fault.
In view of the randomness of filth, mutability and many influencing factors feature, although carried out a lot of research to shaft tower Potential distribution, insulator Potential distribution and filth etc. both at home and abroad, but and guide pollution flashover to protect this problem for including wire and shaft tower in emulation in the lump, also do not have complete set so far, reasonably method is to successfully manage electric transmission line isolator pollution flashover accident, the operation of transmission line also exists great potential safety hazard.
Summary of the invention
For the problems referred to above, the object of the invention is to, how effectively to utilize historical data and how to consider that wire and shaft tower are to the effect of current potential simulation analysis, propose the method improving insulator Potential distribution in overhead transmission line.
For achieving the above object, the technical solution used in the present invention is: the method improving insulator Potential distribution in overhead transmission line, comprising:
A, historical data based on described overhead transmission line, choose the flashover section of taking place frequently of described overhead transmission line, and from this flashover section of taking place frequently, choose use amount maximum: shaft tower, wire and organic composite insulator and toughened glass insulator string;
B, under the desirable clean dried environment of clean dried, adopt threedimensional model as FEM (finite element) model, and include the tower and conductor selected by step a in described threedimensional model, and arranging Artificial Boundaries by infinitely great range cutoffs by zeroth order Asymptotic Boundary Conditions Technique is finite region, wherein: the size of Artificial Boundaries almost no longer changes with the expansion on field domain border with the surrounding electric field of described composite insulator and toughened glass insulator string and is as the criterion, thus utilize finite element numerical computational methods: the organic composite insulator selected by (1) simulation analysis step a: surface potential is along the distribution of leakage distance, surface potential cloud charts, surface field intensity is along the distribution of leakage distance, surface field intensity distributions cloud atlas, the rule of surface maximum field intensity grading ring caliber change, the rule of grading ring surface maximum field intensity grading ring caliber change, with surface field maximum of intensity and grading ring ring footpath and grading ring cover enter the relation between the degree of depth, and average field intensity is along the distribution of leakage distance, (2) and, for the toughened glass insulator string selected by described step a, simulation analysis: when getting the described toughened glass insulator string of different sheet number, is bearing the relation of rate and sheet number near the voltage of high and low pressure side, and, when getting the described toughened glass insulator string of different sheet number, the Potential distribution cloud atlas of toughened glass insulator string,
C, be coated with even pollution layer and under the filthy wet environment of the ideal that damp degree is identical everywhere, the described FEM (finite element) model adopted based on step b and the described Artificial Boundaries of setting, a two-dimensional surface unit is added further for described FEM (finite element) model, in order to simulate the filthy wet environment of described ideal, wherein, described two-dimensional surface unit is endowed pollution layer conductivity, the physical thickness of described two-dimensional surface unit is ignored in whole FEM (finite element) model, thus utilize finite element numerical computational methods: under the different pollution layer conductivity of (I) simulation analysis, organic composite insulator selected by step a: surface potential along the distribution of leakage distance with the relation between pollution layer conductivity, surface field intensity normal component along the distribution of leakage distance with the relation between pollution layer conductivity, surface field intensity tangential component along the distribution of leakage distance with the relation between pollution layer conductivity, the cloud charts of surface field intensity during different pollution layer conductivity, with maximum and the normal direction thereof of surface field intensity, tangential component maximum is with the relation between pollution layer conductivity, (II) and, for the toughened glass insulator string selected by described step a, simulation analysis: when getting the described toughened glass insulator string of different sheet number, when different pollution layer conductivity, bears the relation of rate and sheet number and pollution layer conductivity at the voltage near high and low pressure side, and, when getting the described toughened glass insulator string of different sheet number, when different pollution layer conductivity, the Potential distribution cloud atlas of toughened glass insulator string,
D, the simulation analysis result under the filthy wet environment of desirable clean dried environment and ideal based on step b, c gained, call and improve current potential strategy accordingly.
Further, FEM (finite element) model in step b and c all adopts following subdivision method: first carry out face subdivision to the longitudinal interface of described composite insulator and insulator string, then with described composite insulator and insulator string center line for the axle collar carries out body subdivision around whole insulator, insulator string.
Further, in model, the optimum configurations of shaft tower is as the criterion with parameter in actual track, and in model, the value of conductor length is as the criterion to reduce the impact of wire two ends on insulator surrounding electric field.
Further, described in steps d improves current potential strategy, at least comprises following arbitrary strategy:
Strategy 1: according to history overvoltage data, increases toughened glass insulator insulator string sheet number at the higher shaft tower place of overvoltage;
Strategy 2: set up silicon rubber creeping-increasing skirt on toughened glass insulator string porcelain body;
Strategy 3: brush RTV coating on toughened glass insulator string;
Strategy 4: optimize organic composite insulator umbrella skirt construction;
Strategy 5: optimize organic composite insulator Equalized voltage ring construction;
Strategy 6: optimize organic composite insulator hydrophobic character.
Further, before described in invocation step d improves current potential strategy, the also result of comprehensive following extra simulation analysis:
1), under supposing filthy dampness, the described organic composite insulator chosen in step a and toughened glass insulator crosstalk field are purely resistive field;
2) discrete resistance model is adopted to carry out simulation analysis to the surface potential of described organic composite insulator:
I) when filth uneven distribution axial along insulator, if the pollution layer conductivity of a certain axial location h of insulator is K
h, and the pollution layer conductivity K at peak hmax place with axial location h
hmaxwith the pollution layer conductivity K at minimum point hmin place
hminratio K
hmax: K
hminrepresent the filthy degree of irregularity along the distribution of insulator axial integral; Work as K
hmax>=K
hminand K
hmax≤ K
hmintime, simulation analysis respectively: a) different K
hmax: K
hminunder ratio, the relation of described surface of composite insulator Potential distribution and leakage distance; B) different K
hmax: K
hminunder ratio, the ratio of described surface of composite insulator electric field strength tangential component and average field intensity is with the relation of leakage distance; C) different K
hmax: K
hminthe power plane density of any point unit are and the relation of leakage distance under ratio, on described composite insulator pollution layer;
Ii) when filth is along insulator umbrella upper and lower surface uneven distribution, if the upper and lower surperficial pollution layer conductivity of full skirt is respectively K
t, K
b, and by the two ratio K
t: K
brepresent the filthy degree of irregularity along the distribution of insulator umbrella upper and lower surface; Work as K
t>=K
band K
t≤ K
btime, simulation analysis respectively: (1) different K
t: K
bunder ratio, the relation of described surface of composite insulator Potential distribution and leakage distance; (2) different K
t: K
bunder ratio, the ratio of described surface of composite insulator electric field strength tangential component and average field intensity is with the relation of leakage distance; (3) different K
t: K
bthe power plane density of any point unit are and the relation of leakage distance under ratio, on described composite insulator pollution layer;
3) further, adopt series resistance model to carry out simulation analysis to described toughened glass insulator string:
I) in rectangular coordinate system, the strengthened glass insulation sub-surface pollution layer of described toughened glass insulator string is divided into several segment along leakage paths, and supposes that the pollution layer conductivity in each segment is identical, thus simplify simulation analysis, if K
tS, K
bSrepresent the upper and lower surperficial pollution layer conductivity of strengthened glass insulator respectively, work as K
tS>=K
bSand K
tS≤ K
bStime, simulation analysis respectively: a) different K
tS: K
bSunder ratio, the relation of the distribution of described strengthened glass insulator surface potential and leakage distance; B) different K
tS: K
bSunder ratio, described strengthened glass insulator lower surface voltage bears the distribution of rate;
Ii) establish leakage current to be when there is no dry zone or local arc produces, in strengthened glass insulation sub-surface pollution layer continuous distribution, and flow through the current in resistance property of strengthened glass insulator pollution layer, further simulation analysis: different K
tS: K
bSunder ratio, the distribution of leakage current.
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment
Be described below in conjunction with the preferred embodiments of the present invention, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
embodiment one
According to the embodiment of the present invention, provide the method improving insulator Potential distribution in overhead transmission line, comprising:
A, historical data based on overhead transmission line, choose the flashover section of taking place frequently of overhead transmission line, and choose the maximum shaft tower of use amount, wire and organic composite insulator and toughened glass insulator string from this flashover section of taking place frequently;
B, under the desirable clean dried environment of clean dried, adopt threedimensional model as FEM (finite element) model, and include the tower and conductor selected by step a in described threedimensional model, and arranging Artificial Boundaries by infinitely great range cutoffs by zeroth order Asymptotic Boundary Conditions Technique is finite region, wherein: the size of Artificial Boundaries almost no longer changes with the expansion on field domain border with the surrounding electric field of described composite insulator and toughened glass insulator string and is as the criterion, thus utilize finite element numerical computational methods: the organic composite insulator selected by (1) simulation analysis step a: surface potential is along the distribution of leakage distance, surface potential cloud charts, surface field intensity is along the distribution of leakage distance, surface field intensity distributions cloud atlas, the rule of surface maximum field intensity grading ring caliber change, the rule of grading ring surface maximum field intensity grading ring caliber change, with surface field maximum of intensity and grading ring ring footpath and grading ring cover enter the relation between the degree of depth, and average field intensity is along the distribution of leakage distance, (2) and, for the toughened glass insulator string selected by step a, simulation analysis: when getting the described toughened glass insulator string of different sheet number, is bearing the relation of rate and sheet number near the voltage of high and low pressure side, and, when getting the toughened glass insulator string of different sheet number, the Potential distribution cloud atlas of toughened glass insulator string,
C, be coated with even pollution layer and under the filthy wet environment of the ideal that damp degree is identical everywhere, the described FEM (finite element) model adopted based on step b and the described Artificial Boundaries of setting, further for FEM (finite element) model adds a two-dimensional surface unit, in order to the filthy wet environment of simulate ideal, wherein, two-dimensional surface unit is endowed pollution layer conductivity, the physical thickness of described two-dimensional surface unit is ignored in whole FEM (finite element) model, thus utilize finite element numerical computational methods: under the different pollution layer conductivity of (I) simulation analysis, organic composite insulator selected by step a: surface potential along the distribution of leakage distance with the relation between pollution layer conductivity, surface field intensity normal component along the distribution of leakage distance with the relation between pollution layer conductivity, surface field intensity tangential component along the distribution of leakage distance with the relation between pollution layer conductivity, the cloud charts of surface field intensity during different pollution layer conductivity, with maximum and the normal direction thereof of surface field intensity, tangential component maximum is with the relation between pollution layer conductivity, (II) and, for the toughened glass insulator string selected by step a, simulation analysis: when getting the toughened glass insulator string of different sheet number, when different pollution layer conductivity, bears the relation of rate and sheet number and pollution layer conductivity at the voltage near high and low pressure side, and, when getting the described toughened glass insulator string of different sheet number, when different pollution layer conductivity, the Potential distribution cloud atlas of toughened glass insulator string,
D, the simulation analysis result under the filthy wet environment of desirable clean dried environment and ideal based on step b, c gained, call and improve current potential strategy accordingly.
Based on the above-described embodiment described in step a to steps d, those skilled in the art can complete understanding Technology Ways of the present invention, such technical scheme belongs to a kind of emulation mode in essence, based on the principle of emulation, naturally be that included in factor is more, the effect of emulation is better, but for the present invention, because involved parameter is numerous, in order to EQUILIBRIUM CALCULATION FOR PROCESS amount and technique effect, the basic characteristics of the present embodiment be effectively to make use of adopt in historical data and reality there is the shaft tower representing meaning, wire, organic composite insulator and toughened glass insulator string, and innovatively tower and conductor is brought in correlated finite element model, thus define one novel, comparatively complete, based on historical data and threedimensional FEM, in order to call the technical scheme improving current potential strategy, in addition, with regard to the filthy wet environment of the ideal in above-mentioned steps c: because pollution layer is even pollution layer, and damp degree is identical everywhere, so now pollution layer is uniform conducting layers, different pollution layer conductivities is the just corresponding different filthy wet environment of ideal, just based on this, the present embodiment additionally uses a two-dimensional surface unit to carry out analog insulation sub-surface pollution layer, described two-dimensional surface unit is endowed the conductance attribute of moist pollution layer in process of establishing, physical thickness is ignored in whole FEM (finite element) model, so, the present embodiment just achieves both to have been taken into account pollution layer and turn avoid subdivision small size solid simultaneously in FEM (finite element) calculation.
Above-described embodiment, not only define the emulation thinking and technical characterstic that are different from prior art, also eventually through the linking of each step define one complete, organically technical scheme for improving the Potential distribution of organic composite insulator and toughened glass insulator string in overhead transmission line under filthy wet environment, improve the fail safe of transmission line.
embodiment two
With above-described embodiment unlike, in the present embodiment, FEM (finite element) model in the step b of above-described embodiment one and c all adopts following subdivision method: first carry out face subdivision to the longitudinal interface of composite insulator and insulator string, then with described composite insulator and insulator string center line for the axle collar carries out body subdivision around whole insulator, insulator string.Inventor finds, adopt general method to carry out subdivision to insulator, not only the subdivision time is long, and amount of calculation is large, and FEM (finite element) model after subdivision and the error between former geometrical model are comparatively greatly, and the present embodiment then effectively reduces the amount of calculation of emulation.
embodiment three
With above-described embodiment unlike, in the present embodiment, in the model of above-described embodiment one, the optimum configurations of shaft tower is as the criterion with parameter in actual track, and in model, the value of conductor length is as the criterion to reduce the impact of wire two ends on insulator surrounding electric field.To those skilled in the art, the optimum configurations principle of the parts in emulation, has and tends to actual parameter in reality, also has and tends to desirable modeling, also have another kind of tendency, be intended to the advantage in conjunction with first two tendency.Above optimum configurations principle, object is all to wish the parameter in balance practice and the parameter in desirable modeling, but with regard to the present embodiment, the present embodiment be just intended to limit a kind of specifically, about the optimum configurations principle of tower and conductor in model, those skilled in the art can certainly based on the tendency of aforementioned several optimum configurations principle.
embodiment four
With above-described embodiment unlike, in the present embodiment, described in the steps d of above-described embodiment one improves current potential strategy, at least comprises following arbitrary strategy:
Strategy 1: according to history overvoltage data, increases toughened glass insulator insulator string sheet number at the higher shaft tower place of overvoltage;
Strategy 2: set up silicon rubber creeping-increasing skirt on toughened glass insulator string porcelain body;
Strategy 3: brush RTV coating on toughened glass insulator string;
Strategy 4: optimize organic composite insulator umbrella skirt construction;
Strategy 5: optimize organic composite insulator Equalized voltage ring construction;
Strategy 6: optimize organic composite insulator hydrophobic character.
With regard to this embodiment, above-mentioned strategy has for organic composite insulator, and also have for toughened glass insulator string, what have biases toward further optimal design, the work on the spot then biasing toward technical support personnel had.Specifically call which kind of strategy, depend on simulation analysis result, because simulation analysis both relate to organic composite insulator, also relates to toughened glass insulator string.
embodiment five
With above-described embodiment unlike, in the present embodiment, before the improvement current potential strategy in above-described embodiment one in invocation step d, the also result of comprehensive following extra simulation analysis:
1), under supposing filthy dampness, the organic composite insulator chosen in step a and toughened glass insulator crosstalk field are purely resistive field;
2) discrete resistance model is adopted to carry out simulation analysis to the surface potential of organic composite insulator:
I) when filth uneven distribution axial along insulator, if the pollution layer conductivity of a certain axial location h of insulator is K
h, and the pollution layer conductivity K at peak hmax place with axial location h
hmaxwith the pollution layer conductivity K at minimum point hmin place
hminratio K
hmax: K
hminrepresent the filthy degree of irregularity along the distribution of insulator axial integral; Work as K
hmax>=K
hminand K
hmax≤ K
hmintime, simulation analysis respectively: a) different K
hmax: K
hminunder ratio, the relation of surface of composite insulator Potential distribution and leakage distance; B) different K
hmax: K
hminunder ratio, the ratio of described surface of composite insulator electric field strength tangential component and average field intensity is with the relation of leakage distance; C) different K
hmax: K
hminthe power plane density of any point unit are and the relation of leakage distance under ratio, on composite insulator pollution layer;
Ii) when filth is along insulator umbrella upper and lower surface uneven distribution, if the upper and lower surperficial pollution layer conductivity of full skirt is respectively K
t, K
b, and by the two ratio K
t: K
brepresent the filthy degree of irregularity along the distribution of insulator umbrella upper and lower surface; Work as K
t>=K
band K
t≤ K
btime, simulation analysis respectively: (1) different K
t: K
bunder ratio, the relation of surface of composite insulator Potential distribution and leakage distance; (2) different K
t: K
bunder ratio, the ratio of surface of composite insulator electric field strength tangential component and average field intensity is with the relation of leakage distance; (3) different K
t: K
bthe power plane density of any point unit are and the relation of leakage distance under ratio, on composite insulator pollution layer;
3) further, adopt series resistance model to carry out simulation analysis to toughened glass insulator string:
I) in rectangular coordinate system, the strengthened glass insulation sub-surface pollution layer of described toughened glass insulator string is divided into several segment along leakage paths, and supposes that the pollution layer conductivity in each segment is identical, thus simplify simulation analysis, if K
tS, K
bSrepresent the upper and lower surperficial pollution layer conductivity of strengthened glass insulator respectively, work as K
tS>=K
bSand K
tS≤ K
bStime, simulation analysis respectively: a) different K
tS: K
bSunder ratio, the distribution of strengthened glass insulator surface potential and the relation of leakage distance; B) different K
tS: K
bSunder ratio, strengthened glass insulator lower surface voltage bears the distribution of rate;
Ii) establish leakage current to be when there is no dry zone or local arc produces, in strengthened glass insulation sub-surface pollution layer continuous distribution, and flow through the current in resistance property of strengthened glass insulator pollution layer, further simulation analysis: different K
tS: K
bSunder ratio, the distribution of leakage current.With regard to the present embodiment, there is no doubt that, by included for the simulation analysis of uneven pollution layer, contributing to closer to misunderstanding wet environment really, improving the Potential distribution of organic composite insulator under filthy wet environment in overhead transmission line and toughened glass insulator string more accurately.
In sum, the method of insulator Potential distribution in the improvement overhead transmission line of various embodiments of the present invention, disclose based on historical data of overhead power transmission line, for improving the method for the Potential distribution of organic composite insulator and toughened glass insulator string in overhead transmission line under filthy dampness, by to organic composite insulator in overhead transmission line and toughened glass insulator string in clean dried, cover even pollution layer, and even the current potential under uneven pollution layer and the equidistributed simulation analysis of electric field strength, seek a kind of scheme in order to improve insulator antifouling properties, method in the present invention can be used for the optimal design of system equipment, can ensure the safety of transmission system between normal operation period, age at failure and after fault.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. improve the method for insulator Potential distribution in overhead transmission line, it is characterized in that, comprising:
A, historical data based on described overhead transmission line, choose the flashover section of taking place frequently of described overhead transmission line, and choose the maximum shaft tower of use amount, wire and organic composite insulator and toughened glass insulator string from this flashover section of taking place frequently;
B, under the desirable clean dried environment of clean dried, adopt threedimensional model as FEM (finite element) model, and include the tower and conductor selected by step a in described threedimensional model, and arranging Artificial Boundaries by infinitely great range cutoffs by zeroth order Asymptotic Boundary Conditions Technique is finite region, wherein: the size of Artificial Boundaries almost no longer changes with the expansion on field domain border with the surrounding electric field of described composite insulator and toughened glass insulator string and is as the criterion, thus utilize finite element numerical computational methods: the organic composite insulator selected by (1) simulation analysis step a: surface potential is along the distribution of leakage distance, surface potential cloud charts, surface field intensity is along the distribution of leakage distance, surface field intensity distributions cloud atlas, the rule of surface maximum field intensity grading ring caliber change, the rule of grading ring surface maximum field intensity grading ring caliber change, with surface field maximum of intensity and grading ring ring footpath and grading ring cover enter the relation between the degree of depth, and average field intensity is along the distribution of leakage distance, (2) and, for the toughened glass insulator string selected by described step a, simulation analysis: when getting the described toughened glass insulator string of different sheet number, is bearing the relation of rate and sheet number near the voltage of high and low pressure side, and, when getting the described toughened glass insulator string of different sheet number, the Potential distribution cloud atlas of toughened glass insulator string,
C, be coated with even pollution layer and under the filthy wet environment of the ideal that damp degree is identical everywhere, the described FEM (finite element) model adopted based on step b and the described Artificial Boundaries of setting, a two-dimensional surface unit is added further for described FEM (finite element) model, in order to simulate the filthy wet environment of described ideal, wherein, described two-dimensional surface unit is endowed pollution layer conductivity, the physical thickness of described two-dimensional surface unit is ignored in whole FEM (finite element) model, thus utilize finite element numerical computational methods: under the different pollution layer conductivity of (I) simulation analysis, organic composite insulator selected by step a: surface potential along the distribution of leakage distance with the relation between pollution layer conductivity, surface field intensity normal component along the distribution of leakage distance with the relation between pollution layer conductivity, surface field intensity tangential component along the distribution of leakage distance with the relation between pollution layer conductivity, the cloud charts of surface field intensity during different pollution layer conductivity, with maximum and the normal direction thereof of surface field intensity, tangential component maximum is with the relation between pollution layer conductivity, (II) and, for the toughened glass insulator string selected by described step a, simulation analysis: when getting the described toughened glass insulator string of different sheet number, when different pollution layer conductivity, bears the relation of rate and sheet number and pollution layer conductivity at the voltage near high and low pressure side, and, when getting the described toughened glass insulator string of different sheet number, when different pollution layer conductivity, the Potential distribution cloud atlas of toughened glass insulator string,
D, the simulation analysis result under the filthy wet environment of desirable clean dried environment and ideal based on step b, c gained, call and improve current potential strategy accordingly.
2. the method improving insulator Potential distribution in overhead transmission line according to claim 1, it is characterized in that, FEM (finite element) model in step b and c all adopts following subdivision method: first carry out face subdivision to the longitudinal interface of described composite insulator and insulator string, then with described composite insulator and insulator string center line for the axle collar carries out body subdivision around whole insulator, insulator string.
3. the method improving insulator Potential distribution in overhead transmission line according to claim 1, it is characterized in that, in model, the optimum configurations of shaft tower is as the criterion with parameter in actual track, and in model, the value of conductor length is as the criterion to reduce the impact of wire two ends on insulator surrounding electric field.
4. the method improving insulator Potential distribution in overhead transmission line according to claim 1, is characterized in that, described in steps d improves current potential strategy, at least comprises following arbitrary strategy:
Strategy 1: according to history overvoltage data, increases toughened glass insulator insulator string sheet number at the higher shaft tower place of overvoltage;
Strategy 2: set up silicon rubber creeping-increasing skirt on toughened glass insulator string porcelain body;
Strategy 3: brush RTV coating on toughened glass insulator string;
Strategy 4: optimize organic composite insulator umbrella skirt construction;
Strategy 5: optimize organic composite insulator Equalized voltage ring construction;
Strategy 6: optimize organic composite insulator hydrophobic character.
5. the method improving insulator Potential distribution in overhead transmission line according to claim 1, is characterized in that, before described in invocation step d improves current potential strategy, and the also result of comprehensive following extra simulation analysis:
1), under supposing filthy dampness, the described organic composite insulator chosen in step a and toughened glass insulator crosstalk field are purely resistive field;
2) discrete resistance model is adopted to carry out simulation analysis to the surface potential of described organic composite insulator:
I) when filth uneven distribution axial along insulator, if the pollution layer conductivity of a certain axial location h of insulator is K
h, and the pollution layer conductivity K at peak hmax place with axial location h
hmaxwith the pollution layer conductivity K at minimum point hmin place
hminratio K
hmax: K
hminrepresent the filthy degree of irregularity along the distribution of insulator axial integral; Work as K
hmax k
hminand K
hmax k
hmintime, simulation analysis respectively: a) different K
hmax: K
hminunder ratio, the relation of described surface of composite insulator Potential distribution and leakage distance; B) different K
hmax: K
hminunder ratio, the ratio of described surface of composite insulator electric field strength tangential component and average field intensity is with the relation of leakage distance; C) different K
hmax: K
hminthe power plane density of any point unit are and the relation of leakage distance under ratio, on described composite insulator pollution layer;
Ii) when filth is along insulator umbrella upper and lower surface uneven distribution, if the upper and lower surperficial pollution layer conductivity of full skirt is respectively K
t, K
b, and by the two ratio K
t: K
brepresent the filthy degree of irregularity along the distribution of insulator umbrella upper and lower surface; Work as K
t k
band K
t k
btime, simulation analysis respectively: (1) different K
t: K
bunder ratio, the relation of described surface of composite insulator Potential distribution and leakage distance; (2) different K
t: K
bunder ratio, the ratio of described surface of composite insulator electric field strength tangential component and average field intensity is with the relation of leakage distance; (3) different K
t: K
bthe power plane density of any point unit are and the relation of leakage distance under ratio, on described composite insulator pollution layer;
3) further, adopt series resistance model to carry out simulation analysis to described toughened glass insulator string:
I) in rectangular coordinate system, the strengthened glass insulation sub-surface pollution layer of described toughened glass insulator string is divided into several segment along leakage paths, and supposes that the pollution layer conductivity in each segment is identical, thus simplify simulation analysis, if K
tS, K
bSrepresent the upper and lower surperficial pollution layer conductivity of strengthened glass insulator respectively, work as K
tS k
bSand K
tS k
bStime, simulation analysis respectively: a) different K
tS: K
bSunder ratio, the relation of the distribution of described strengthened glass insulator surface potential and leakage distance; B) different K
tS: K
bSunder ratio, described strengthened glass insulator lower surface voltage bears the distribution of rate;
Ii) establish leakage current to be when there is no dry zone or local arc produces, in strengthened glass insulation sub-surface pollution layer continuous distribution, and flow through the current in resistance property of strengthened glass insulator pollution layer, further simulation analysis: different K
tS: K
bSunder ratio, the distribution of leakage current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210186198.8A CN102694352B (en) | 2012-06-07 | 2012-06-07 | Method for improving insulator potential distribution in overhead power transmission line |
Applications Claiming Priority (1)
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| CN103078318B (en) * | 2013-01-09 | 2014-11-26 | 西安交通大学 | Overvoltage improvement method on basis of historical data of overhead power transmission line |
| CN104091039A (en) * | 2014-04-17 | 2014-10-08 | 国家电网公司 | Method for analyzing and calculating withstand voltage of composite insulator |
| CN105277822B (en) * | 2015-09-17 | 2018-06-12 | 广西电网有限责任公司电力科学研究院 | A kind of artificial accelerated aging test method for GIS disc insulators |
| CN105761856A (en) * | 2016-04-13 | 2016-07-13 | 云南电网有限责任公司电力科学研究院 | Differentiation configuration method for parallel gap electrode |
| CN105912812B (en) * | 2016-04-29 | 2019-04-23 | 南方电网科学研究院有限责任公司 | Method and device for determining shed parameters of post insulator |
| CN106205900B (en) * | 2016-08-24 | 2017-12-12 | 国网江西省电力公司南昌供电分公司 | A kind of gold utensil design method and gold utensil for improving insulator contamination voltage |
| CN108875143B (en) * | 2018-05-25 | 2022-02-22 | 大连交通大学 | Design method of chemical composite plating tank system |
| CN110070968B (en) * | 2019-03-20 | 2021-11-23 | 天津大学 | Preparation method of direct current flashover resistant nonlinear conductive coating insulator |
| CN115508603A (en) * | 2022-10-09 | 2022-12-23 | 贵州电网有限责任公司 | Tower structure parameter inversion method adopting space electric field fixed point integral |
| CN117368797B (en) * | 2023-11-17 | 2024-08-13 | 国网青海省电力公司海南供电公司 | Composite insulator flashover early warning method based on leakage current and power field analysis |
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