CN105321027A - Lightning protection method and apparatus for power transmission line - Google Patents
Lightning protection method and apparatus for power transmission line Download PDFInfo
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- CN105321027A CN105321027A CN201410379892.0A CN201410379892A CN105321027A CN 105321027 A CN105321027 A CN 105321027A CN 201410379892 A CN201410379892 A CN 201410379892A CN 105321027 A CN105321027 A CN 105321027A
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Abstract
The invention discloses a lightning protection method and apparatus for a power transmission line. The lightning protection method for the power transmission line comprises: obtaining lightning parameters of the power transmission line; according to the lightning parameters, calculating a lightning protection degree of each tower foundation of the power transmission line; and according to the lightning protection degree, setting a lightning protection mode of the power transmission line. Through the lightning protection method and apparatus, the problem of low lightning protection performance of a power transmission line in the prior art is solved, so that the effect of improving the security and stability of the power transmission line is achieved.
Description
Technical field
The present invention relates to technical field of electric power, in particular to a kind of lightening arresting method and device of transmission line of electricity.
Background technology
In prior art, transmission line lightning stroke risk assessment depends on lightning withstand level and the tripping rate with lightning strike of computing electric power line, and the tripping rate with lightning strike of a few base typical case's shaft towers under typical topography and geomorphology and traditional lightning parameter in general computational scheme.During the lightning stroke flashover characteristic of assessment whole piece circuit generally also just by the tripping rate with lightning strike of typical shaft tower that calculates according to the ratio weighted mean shared in line corridor of various topography and geomorphology; analyze content not comprehensively careful; the relative risk of each shaft tower lightning stroke flashover is not provided yet; make accurately to carry out lightning protection to power delivery circuit, cause the lightning protection properties of transmission line of electricity low.
For the problem that the lightning protection properties of transmission line of electricity in correlation technique is low, at present effective solution is not yet proposed.
Summary of the invention
Fundamental purpose of the present invention is the lightening arresting method and the device that provide a kind of transmission line of electricity, to solve the problem that in prior art, the lightning protection properties of transmission line of electricity is low.
According to an aspect of the present invention, a kind of lightening arresting method of transmission line of electricity is provided.
Lightening arresting method according to transmission line of electricity of the present invention comprises: the lightning parameter obtaining described transmission line of electricity; According to described lightning parameter, the lightning protection degree of described transmission line of electricity by base shaft tower is calculated; And the Lightning Protection of described transmission line of electricity is set according to described lightning protection degree.
Further, the lightning parameter obtaining described transmission line of electricity comprises: the back flash-over rate and the counterattack trip-out rate that obtain described transmission line of electricity, carries out calculating and comprises: calculate the lightning protection degree of described transmission line of electricity by base shaft tower according to described back flash-over rate and described counterattack trip-out rate according to described lightning parameter to described transmission line of electricity by the lightning protection degree of base shaft tower.
Further, carry out calculating to described transmission line of electricity by the lightning protection degree of base shaft tower according to described back flash-over rate and described counterattack trip-out rate to comprise: within the scope of multiple first pre-set level, search the indication range residing for described back flash-over rate, obtain the first scope; Obtain the intensity grade that described first scope is corresponding, obtain the first estate; Within the scope of multiple second pre-set level, search the indication range residing for described counterattack trip-out rate, obtain the second scope; Obtain the intensity grade that described second scope is corresponding, obtain the second grade; Within the scope of multiple 3rd pre-set level, search the indication range residing for described back flash-over rate and described counterattack trip-out rate sum, obtain the 3rd scope; Obtain the intensity grade that described 3rd scope is corresponding, obtain the tertiary gradient; And comprehensive described the first estate, described second grade and the described tertiary gradient, obtain the lightning protection degree of described transmission line of electricity.
Further, described multiple first pre-set level scope comprises [0,0.5S
r), [0.5S
r, S
r), [S
r, 1.5S
r) and [1.5S
r, ∞), wherein, S
rbe the first parameter preset, described multiple second pre-set level scope comprises [0,0.5S
f), [0.5S
f, S
f), [S
f, 1.5S
f) and [1.5S
f, ∞), wherein, S
fbe the second parameter preset, described multiple 3rd pre-set level scope comprises [0,0.5 (S
r+ S
f)), [0.5 (S
r+ S
f), (S
r+ S
f)), [(S
r+ S
f), 1.5 (S
r+ S
f)) and [1.5 (S
r+ S
f), ∞).
According to a further aspect in the invention, a kind of lightning protection device of transmission line of electricity is provided.
Lightning protection device according to transmission line of electricity of the present invention comprises: acquiring unit, for obtaining the lightning parameter of described transmission line of electricity; Computing unit, for calculating the lightning protection degree of described transmission line of electricity by base shaft tower according to described lightning parameter; And setting unit, for arranging the Lightning Protection of described transmission line of electricity according to described lightning protection degree.
Further, described acquiring unit comprises: obtain subelement, for obtaining back flash-over rate and the counterattack trip-out rate of described transmission line of electricity, described computing unit comprises: computation subunit, for calculating the lightning protection degree of described transmission line of electricity by base shaft tower according to described back flash-over rate and described counterattack trip-out rate.
Further, described computation subunit comprises: first searches module, for searching the indication range residing for described back flash-over rate within the scope of multiple first pre-set level, obtains the first scope; First acquisition module, for obtaining intensity grade corresponding to described first scope, obtains the first estate; Second searches module, for searching the indication range residing for described counterattack trip-out rate within the scope of multiple second pre-set level, obtains the second scope; Second acquisition module, for obtaining intensity grade corresponding to described second scope, obtains the second grade; 3rd searches module, for searching the indication range residing for described back flash-over rate and described counterattack trip-out rate sum within the scope of multiple 3rd pre-set level, obtains the 3rd scope; 3rd acquisition module, for obtaining intensity grade corresponding to described 3rd scope, obtains the tertiary gradient; And integration module, for comprehensive described the first estate, described second grade and the described tertiary gradient, obtain the lightning protection degree of described transmission line of electricity.
Further, described multiple first pre-set level scope comprises [0,0.5S
r), [0.5S
r, S
r), [S
r, 1.5S
r) and [1.5S
r, ∞), wherein, S
rbe the first parameter preset, described multiple second pre-set level scope comprises [0,0.5S
f), [0.5S
f, S
f), [S
f, 1.5S
f) and [1.5S
f, ∞), wherein, S
fbe the second parameter preset, described multiple 3rd pre-set level scope comprises [0,0.5 (S
r+ S
f)), [0.5 (S
r+ S
f), (S
r+ S
f)), [(S
r+ S
f), 1.5 (S
r+ S
f)) and [1.5 (S
r+ S
f), ∞).
In the present invention, the lightning parameter obtaining described transmission line of electricity is adopted; According to described lightning parameter, the lightning protection degree of described transmission line of electricity by base shaft tower is calculated; And the Lightning Protection of described transmission line of electricity is set according to described lightning protection degree.By obtaining radar parameter, and calculate lightning protection degree based on this, then the Lightning Protection of transmission line of electricity is set according to lightning protection degree, achieve the lightening activity considering transmission line of electricity, line construction, the various factors such as topography and geomorphology and feature, adopt the lightning parameter obtained based on lightning monitoring system statistics analysis of the inspected data, by base shaft tower, lightning protection calculation has been carried out to transmission line of electricity, the relative lightning protection properties reflecting transmission line of electricity each base shaft tower is strong and weak, effectively can help Transmission Line Design and operation department more meticulously, take lightning protection measures to improve line thunder protection performance targetedly, the management electrical network more become more meticulous, solve the problem that in prior art, the lightning protection properties of transmission line of electricity is low, and then reach the effect improving transmission line of electricity safety and stability.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the process flow diagram of the lightening arresting method of transmission line of electricity according to the embodiment of the present invention; And
Fig. 2 is the schematic diagram of the lightning protection device of transmission line of electricity according to the embodiment of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
When not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiment 1
According to the embodiment of the present invention, a kind of embodiment of the method that can implement by the application's device embodiment or perform can be provided, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
According to the embodiment of the present invention, provide a kind of lightening arresting method of transmission line of electricity, below concrete introduction done to the lightening arresting method of the transmission line of electricity that the embodiment of the present invention provides:
Fig. 1 is the process flow diagram of the lightening arresting method of transmission line of electricity according to the embodiment of the present invention, and as shown in Figure 1, the method comprises following step S102 to step S106:
S102: the lightning parameter obtaining transmission line of electricity, wherein, lightning parameter is the thunder and lightning data running accumulation based on lightning monitoring system, in the form of a grid line corridor is divided, add up, analyze and obtain the lightning parameter such as CG lightning density, the distribution of amplitude of lightning current cumulative probability that can reflect this line corridor different time, zones of different lightening activity feature.
S104: the lightning protection degree of transmission line of electricity by base shaft tower is calculated according to lightning parameter, namely, according to the evaluation criteria of setting, in conjunction with the result of calculation by base shaft tower tripping rate with lightning strike, assess the Lightning performance of every base shaft tower, and analyze the reason of the weak easy flashover of shaft tower of Lightning performance in conjunction with shaft tower their location lightening activity parameter, tower structure, insulation configuration, topography and landform character.
S106: the Lightning Protection that transmission line of electricity is set according to lightning protection degree.Particularly, based on lightning protection performance evaluation result, the reason of the easy flashover of the shaft tower that binding analysis obtains and the feature of various lightning protection measures, formulate lightning protection measures and resolution targetedly, and the tripping rate with lightning strike after Lightning Transformation scheme implementation is calculated again, the effect of assessment Lightning Transformation.
The lightening arresting method of the transmission line of electricity that the embodiment of the present invention provides, by obtaining radar parameter, and calculate lightning protection degree based on this, then the Lightning Protection of transmission line of electricity is set according to lightning protection degree, achieve the lightening activity considering transmission line of electricity, line construction, the various factors such as topography and geomorphology and feature, adopt the lightning parameter obtained based on lightning monitoring system statistics analysis of the inspected data, by base shaft tower, lightning protection calculation has been carried out to transmission line of electricity, the relative lightning protection properties reflecting transmission line of electricity each base shaft tower is strong and weak, effectively can help Transmission Line Design and operation department more meticulously, take lightning protection measures to improve line thunder protection performance targetedly, the management electrical network more become more meticulous, solve the problem that in prior art, the lightning protection properties of transmission line of electricity is low, and then reach the effect improving transmission line of electricity safety and stability.
Wherein, the lightning parameter obtaining transmission line of electricity comprises: the back flash-over rate P obtaining transmission line of electricity
rwith counterattack trip-out rate P
f, correspondingly, according to lightning parameter, by the lightning protection degree of base shaft tower, calculating is carried out to transmission line of electricity and comprises: according to back flash-over rate P
rwith counterattack trip-out rate P
fthe lightning protection degree of transmission line of electricity by base shaft tower is calculated.
Particularly, according to back flash-over rate P
rwith counterattack trip-out rate P
fcarry out calculating to transmission line of electricity by the lightning protection degree of base shaft tower to comprise: within the scope of multiple first pre-set level, search back flash-over rate P
rresiding indication range, obtains the first scope; Obtain the intensity grade that the first scope is corresponding, obtain the first estate; Counterattack trip-out rate P is searched within the scope of multiple second pre-set level
fresiding indication range, obtains the second scope; Obtain the intensity grade that the second scope is corresponding, obtain the second grade; Within the scope of multiple 3rd pre-set level, search the indication range residing for trip-out rate P, obtain the 3rd scope, wherein, trip-out rate P is back flash-over rate P
rwith counterattack trip-out rate P
fsum; Obtain the intensity grade that the 3rd scope is corresponding, obtain the tertiary gradient; And comprehensive the first estate, the second grade and the tertiary gradient, obtain the lightning protection degree of transmission line of electricity.
In embodiments of the present invention, as shown in table 1, multiple first pre-set level scope can be set to [0,0.5S
r), [0.5S
r, S
r), [S
r, 1.5S
r) and [1.5S
r, ∞), multiple second pre-set level scope can be set to [0,0.5S
f), [0.5S
f, S
f), [S
f, 1.5S
f) and [1.5S
f, ∞), multiple 3rd pre-set level scope can be set to [0,0.5 (S
r+ S
f)), [0.5 (S
r+ S
f), (S
r+ S
f)), [(S
r+ S
f), 1.5 (S
r+ S
f)) and [1.5 (S
r+ S
f), ∞), wherein, S
rbe the first parameter preset, S
fit is the second parameter preset.
Table 1
Wherein, the first parameter preset Sr, the second parameter preset Sf are respectively shielding risk control index, counterattack risk control index; First parameter preset Sr can to get in " 110 (66) kV ~ 500kV overhead transmission line management regulation " (hereinafter referred to as " specification ") that State Grid Corporation of China issues shielding proportion in the 89 article of middle trip-out rate setting (being 40 thunderstorm days in specification) × operating experience; Second parameter preset Sf can get in trip-out rate setting × operating experience and strike back proportion.The tripping rate with lightning strike (standard to be average year CG lightning density be 2.78 times/(km2a)) of each electric pressure circuit in " specification ", should reach following index:
110kV:0.525 secondary/hundred kilometer year; (this circuit with 110kV circuit for standard).
To consider in lightning fault that shielding accounts for 4.4%, counterattack accounts for 95.6%, therefore back flash-over rate desired value is decided to be 0.023 time/hundred kilometers years, counterattack trip-out rate desired value is decided to be 0.502 time/hundred kilometers years, then above-mentioned table 1 can be expressed as further as following table 2:
Table 2
| First pre-set level scope | [0,0.012) | [0.012,0.023) | [0.023,0.035) | [0.0.35,∞) |
| Grade | A | B | C | D |
| Second pre-set level scope | [0,0.251) | [0.251,0.502) | [0.502,0.753) | [0.753,∞) |
| Grade | A | B | C | D |
| 3rd pre-set level scope | [0,0.263) | [0.263,0.525) | [0.525,0.788) | [0.788,∞) |
| Grade | A | B | C | D |
By the way, the lightning protection degree (that is, lightning stroke flashover risk) of each for transmission line of electricity base shaft tower is divided into A, B, C, D, achieves and the power relatively of each shaft tower shielding, counterattack lightning protection properties is showed more intuitively.Follow-up, can arrange the Lightning Protection of transmission line of electricity according to the height of lightning protection properties, the shaft tower relatively weak for wind and thunder performance can strengthen lightning protection measures, particularly, in embodiments of the present invention, can adopt following lightning protection measures:
1, shielding angle is reduced
Along with the reduction gradually at route protection angle, the risk of shielding failure of circuit is on a declining curve, and reducing shielding angle is reduce back flash-over rate to compare effective method.But for built circuit, change route protection angle feasibility poor, and for the larger shaft tower of mountain area ground elevation, owing to can not significantly reduce by the restriction shielding angle of tower head design, other effective Lightning Shielding measures should be taked.
2, circuit dielectric level is strengthened
Improving line insulation level is also a kind of method strengthening line lightning resisting level, by improving the dielectric level of circuit, can increase the U50% sparking voltage of insulator, improving the lightning withstand level of circuit.
3, pole tower ground resistance is reduced
Reducing pole tower ground resistance is the basic anti-counter-measure of ultra-high-tension power transmission line, reduces pole tower ground resistance and can reduce lightning stroke rate current potential, improve the lightning withstand level of circuit, effectively prevent counterattack accident from occurring.The measure reducing pole tower ground resistance has multiple, as horizontal extension grounding body, deep embeded type earthing pole, filling low-resistance material, installs conductive earthing module etc. additional.
4, coupling ground wire is set up
It is increase the coupling coefficient between lightning conducter and wire that the effect of coupling ground wire mainly contains two: one, thus reduces the counterattack of insulator chain both end voltage and the component of induced voltage; Two is the shunting actions to adjacent shaft tower when increasing lightning stroke rate, reduces the voltage that insulator bears, improves line lightning resisting level.But the construction of erection coupling ground wire is had any problem, and limits by topographic condition, and increase circuit and run electric energy loss, also likely need to fall trees, make the workload of circuit operation maintenance and difficulty to increase, its economical cost is also higher.
5, bypass ground wire is set up
Erection bypass ground wire can strengthen the shielding action to wire, and have certain minimizing thunderbolt effect, but need to set up tower and conductor in addition, economical cost is very high.
6, portable protective gaps is installed additional
When thunderbolt mainly occurs in the effect of portable protective gaps, portable protective gaps protects insulator not to be damaged by arc flash, can reduce the stroke-incidence rate of circuit.For existing line, parallel connection gaps meeting shorted section insulator is installed, thus causes line insulation level to reduce, cause tripping rate with lightning strike to increase on the contrary.
7, wave arrestment arrester is installed
At home and abroad in operating experience, thunderbolt span central authorities' lightning conducter and near cause flashover to trip probability minimum, as long as therefore make the shaft tower tower head of transmission line of electricity and not neighbouringly to be struck by lightning, the tripping rate with lightning strike of transmission line of electricity will decline greatly.The lightning protection of visible transmission line of electricity, can be summed up as the lightning protection centered by shaft tower to a great extent.
When the arrester that shaft tower tower head is installed, by improving shaft tower height, that can not only improve tower top draws thunder ability, and that can also improve lightning conducter draws thunder ability, the shielding near shaft tower is attracted to tower head change and is converted into counterattack, thus greatly reduce risk of shielding failure.
8, nano magnetic flow plug is installed additional
Also to protecting accordingly the inlet wire section of electric substation, in order to limit invasion wave steepness, nano magnetic flow plug can be installed additional.
9, circuit Zinc-Oxide Arrester is installed
In order to reduce the lightning strike accident of circuit, improve power supply reliability, installing Zinc-Oxide Arrester is on the line reduce a kind of very effective method of circuit lightning strike accident.Theoretical calculation analysis and practice all prove, leakage conductor is applied to circuit lightening activity is strong or soil resistivity is high, reduces the inconvenient line segment of stake resistance, the lightning withstand level of raising circuit that can be larger, reduce the tripping rate with lightning strike of circuit, thus reduce the unplanned power off time of circuit, improve power supply reliability.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in instructions all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that can add required general hardware platform by software according to the method for above-described embodiment and realize, hardware can certainly be passed through, but in a lot of situation, the former is better embodiment.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium (as ROM/RAM, magnetic disc, CD), comprising some instructions in order to make a station terminal equipment (can be mobile phone, computing machine, server, or the network equipment etc.) perform method described in each embodiment of the present invention.
Embodiment 2
According to the embodiment of the present invention, additionally provide a kind of lightning protection device of transmission line of electricity of the lightening arresting method for implementing above-mentioned transmission line of electricity, the lightning protection device of this transmission line of electricity is mainly used in the lightening arresting method performing the transmission line of electricity that embodiment of the present invention foregoing provides, and does concrete introduction below to the lightning protection device of the transmission line of electricity that the embodiment of the present invention provides:
Fig. 2 is the schematic diagram of the lightning protection device of transmission line of electricity according to the embodiment of the present invention, and as shown in Figure 2, the lightning protection device of this transmission line of electricity mainly comprises acquiring unit 10, computing unit 20 and setting unit 30, wherein:
Acquiring unit 10 is for obtaining the lightning parameter of transmission line of electricity, wherein, lightning parameter is the thunder and lightning data running accumulation based on lightning monitoring system, in the form of a grid line corridor is divided, add up, analyze and obtain the lightning parameter such as CG lightning density, the distribution of amplitude of lightning current cumulative probability that can reflect this line corridor different time, zones of different lightening activity feature.
Computing unit 20 is for calculating the lightning protection degree of transmission line of electricity by base shaft tower according to lightning parameter, namely, according to the evaluation criteria of setting, in conjunction with the result of calculation by base shaft tower tripping rate with lightning strike, assess the Lightning performance of every base shaft tower, and analyze the reason of the weak easy flashover of shaft tower of Lightning performance in conjunction with shaft tower their location lightening activity parameter, tower structure, insulation configuration, topography and landform character.
Setting unit 30 is for arranging the Lightning Protection of transmission line of electricity according to lightning protection degree.Particularly, based on lightning protection performance evaluation result, the reason of the easy flashover of the shaft tower that binding analysis obtains and the feature of various lightning protection measures, formulate lightning protection measures and resolution targetedly, and the tripping rate with lightning strike after Lightning Transformation scheme implementation is calculated again, the effect of assessment Lightning Transformation.
The lightning protection device of the transmission line of electricity that the embodiment of the present invention provides, by obtaining radar parameter, and calculate lightning protection degree based on this, then the Lightning Protection of transmission line of electricity is set according to lightning protection degree, achieve the lightening activity considering transmission line of electricity, line construction, the various factors such as topography and geomorphology and feature, adopt the lightning parameter obtained based on lightning monitoring system statistics analysis of the inspected data, by base shaft tower, lightning protection calculation has been carried out to transmission line of electricity, the relative lightning protection properties reflecting transmission line of electricity each base shaft tower is strong and weak, effectively can help Transmission Line Design and operation department more meticulously, take lightning protection measures to improve line thunder protection performance targetedly, the management electrical network more become more meticulous, solve the problem that in prior art, the lightning protection properties of transmission line of electricity is low, and then reach the effect improving transmission line of electricity safety and stability.
Wherein, acquiring unit 10 comprises acquisition subelement, and computing unit 20 comprises computation subunit, obtains subelement for obtaining the back flash-over rate P of transmission line of electricity
rwith counterattack trip-out rate P
f, correspondingly, computation subunit is used for according to back flash-over rate P
rwith counterattack trip-out rate P
fthe lightning protection degree of transmission line of electricity by base shaft tower is calculated.
Particularly, computation subunit mainly comprises first to the 3rd and searches module, the first to the 3rd acquisition module and integration module, and wherein, first searches module for searching back flash-over rate P within the scope of multiple first pre-set level
rresiding indication range, obtains the first scope; First acquisition module, for obtaining intensity grade corresponding to the first scope, obtains the first estate; Second searches module for searching counterattack trip-out rate P within the scope of multiple second pre-set level
fresiding indication range, obtains the second scope; Second acquisition module, for obtaining intensity grade corresponding to the second scope, obtains the second grade; 3rd searches module for searching the indication range residing for trip-out rate P within the scope of multiple 3rd pre-set level, and obtain the 3rd scope, wherein, trip-out rate P is back flash-over rate P
rwith counterattack trip-out rate P
fsum; 3rd acquisition module, for obtaining intensity grade corresponding to the 3rd scope, obtains the tertiary gradient; Integration module is used for comprehensive the first estate, the second grade and the tertiary gradient, obtains the lightning protection degree of transmission line of electricity.
In embodiments of the present invention, as shown in table 1, multiple first pre-set level scope can be set to [0,0.5S
r), [0.5S
r, S
r), [S
r, 1.5S
r) and [1.5S
r, ∞), multiple second pre-set level scope can be set to [0,0.5S
f), [0.5S
f, S
f), [S
f, 1.5S
f) and [1.5S
f, ∞), multiple 3rd pre-set level scope can be set to [0,0.5 (S
r+ S
f)), [0.5 (S
r+ S
f), (S
r+ S
f)), [(S
r+ S
f), 1.5 (S
r+ S
f)) and [1.5 (S
r+ S
f), ∞), wherein, S
rbe the first parameter preset, S
fit is the second parameter preset.
By the way, the lightning protection degree (that is, lightning stroke flashover risk) of each for transmission line of electricity base shaft tower is divided into A, B, C, D, achieves and the power relatively of each shaft tower shielding, counterattack lightning protection properties is showed more intuitively.Follow-up, can arrange the Lightning Protection of transmission line of electricity according to the height of lightning protection properties, the shaft tower relatively weak for wind and thunder performance can strengthen lightning protection measures, particularly, in embodiments of the present invention, can adopt following lightning protection measures:
1, shielding angle is reduced
Along with the reduction gradually at route protection angle, the risk of shielding failure of circuit is on a declining curve, and reducing shielding angle is reduce back flash-over rate to compare effective method.But for built circuit, change route protection angle feasibility poor, and for the larger shaft tower of mountain area ground elevation, owing to can not significantly reduce by the restriction shielding angle of tower head design, other effective Lightning Shielding measures should be taked.
2, circuit dielectric level is strengthened
Improving line insulation level is also a kind of method strengthening line lightning resisting level, by improving the dielectric level of circuit, can increase the U50% sparking voltage of insulator, improving the lightning withstand level of circuit.
3, pole tower ground resistance is reduced
Reducing pole tower ground resistance is the basic anti-counter-measure of ultra-high-tension power transmission line, reduces pole tower ground resistance and can reduce lightning stroke rate current potential, improve the lightning withstand level of circuit, effectively prevent counterattack accident from occurring.The measure reducing pole tower ground resistance has multiple, as horizontal extension grounding body, deep embeded type earthing pole, filling low-resistance material, installs conductive earthing module etc. additional.
4, coupling ground wire is set up
It is increase the coupling coefficient between lightning conducter and wire that the effect of coupling ground wire mainly contains two: one, thus reduces the counterattack of insulator chain both end voltage and the component of induced voltage; Two is the shunting actions to adjacent shaft tower when increasing lightning stroke rate, reduces the voltage that insulator bears, improves line lightning resisting level.But the construction of erection coupling ground wire is had any problem, and limits by topographic condition, and increase circuit and run electric energy loss, also likely need to fall trees, make the workload of circuit operation maintenance and difficulty to increase, its economical cost is also higher.
5, bypass ground wire is set up
Erection bypass ground wire can strengthen the shielding action to wire, and have certain minimizing thunderbolt effect, but need to set up tower and conductor in addition, economical cost is very high.
6, portable protective gaps is installed additional
When thunderbolt mainly occurs in the effect of portable protective gaps, portable protective gaps protects insulator not to be damaged by arc flash, can reduce the stroke-incidence rate of circuit.For existing line, parallel connection gaps meeting shorted section insulator is installed, thus causes line insulation level to reduce, cause tripping rate with lightning strike to increase on the contrary.
7, wave arrestment arrester is installed
At home and abroad in operating experience, thunderbolt span central authorities' lightning conducter and near cause flashover to trip probability minimum, as long as therefore make the shaft tower tower head of transmission line of electricity and not neighbouringly to be struck by lightning, the tripping rate with lightning strike of transmission line of electricity will decline greatly.The lightning protection of visible transmission line of electricity, can be summed up as the lightning protection centered by shaft tower to a great extent.
When the arrester that shaft tower tower head is installed, by improving shaft tower height, that can not only improve tower top draws thunder ability, and that can also improve lightning conducter draws thunder ability, the shielding near shaft tower is attracted to tower head change and is converted into counterattack, thus greatly reduce risk of shielding failure.
8, nano magnetic flow plug is installed additional
Also to protecting accordingly the inlet wire section of electric substation, in order to limit invasion wave steepness, nano magnetic flow plug can be installed additional.
9, circuit Zinc-Oxide Arrester is installed
In order to reduce the lightning strike accident of circuit, improve power supply reliability, installing Zinc-Oxide Arrester is on the line reduce a kind of very effective method of circuit lightning strike accident.Theoretical calculation analysis and practice all prove, leakage conductor is applied to circuit lightening activity is strong or soil resistivity is high, reduces the inconvenient line segment of stake resistance, the lightning withstand level of raising circuit that can be larger, reduce the tripping rate with lightning strike of circuit, thus reduce the unplanned power off time of circuit, improve power supply reliability.
From above description, can find out, present invention achieves the lightening activity considering transmission line of electricity, line construction, the various factors such as topography and geomorphology and feature, adopt the lightning parameter obtained based on lightning monitoring system statistics analysis of the inspected data, by base shaft tower, lightning protection calculation has been carried out to transmission line of electricity, the relative lightning protection properties reflecting transmission line of electricity each base shaft tower is strong and weak, effectively can help Transmission Line Design and operation department more meticulously, take lightning protection measures to improve line thunder protection performance targetedly, the management electrical network more become more meticulous, solve the problem that in prior art, the lightning protection properties of transmission line of electricity is low, and then reach the effect improving transmission line of electricity safety and stability.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.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 (8)
1. a lightening arresting method for transmission line of electricity, is characterized in that, comprising:
Obtain the lightning parameter of described transmission line of electricity;
According to described lightning parameter, the lightning protection degree of described transmission line of electricity by base shaft tower is calculated; And
The Lightning Protection of described transmission line of electricity is set according to described lightning protection degree.
2. lightening arresting method according to claim 1, is characterized in that,
The lightning parameter obtaining described transmission line of electricity comprises: the back flash-over rate and the counterattack trip-out rate that obtain described transmission line of electricity,
Carry out calculating to described transmission line of electricity by the lightning protection degree of base shaft tower according to described lightning parameter to comprise: calculate the lightning protection degree of described transmission line of electricity by base shaft tower according to described back flash-over rate and described counterattack trip-out rate.
3. lightening arresting method according to claim 2, is characterized in that, carries out calculating comprise according to described back flash-over rate and described counterattack trip-out rate to described transmission line of electricity by the lightning protection degree of base shaft tower:
Within the scope of multiple first pre-set level, search the indication range residing for described back flash-over rate, obtain the first scope;
Obtain the intensity grade that described first scope is corresponding, obtain the first estate;
Within the scope of multiple second pre-set level, search the indication range residing for described counterattack trip-out rate, obtain the second scope;
Obtain the intensity grade that described second scope is corresponding, obtain the second grade;
Within the scope of multiple 3rd pre-set level, search the indication range residing for described back flash-over rate and described counterattack trip-out rate sum, obtain the 3rd scope;
Obtain the intensity grade that described 3rd scope is corresponding, obtain the tertiary gradient; And
Comprehensive described the first estate, described second grade and the described tertiary gradient, obtain the lightning protection degree of described transmission line of electricity.
4. lightening arresting method according to claim 3, is characterized in that,
Described multiple first pre-set level scope comprises [0,0.5S
r), [0.5S
r, S
r), [S
r, 1.5S
r) and [1.5S
r, ∞), wherein, S
rbe the first parameter preset,
Described multiple second pre-set level scope comprises [0,0.5S
f), [0.5S
f, S
f), [S
f, 1.5S
f) and [1.5S
f, ∞), wherein, S
fbe the second parameter preset,
Described multiple 3rd pre-set level scope comprises [0,0.5 (S
r+ S
f)), [0.5 (S
r+ S
f), (S
r+ S
f)), [(S
r+ S
f), 1.5 (S
r+ S
f)) and [1.5 (S
r+ S
f), ∞).
5. a lightning protection device for transmission line of electricity, is characterized in that, comprising:
Acquiring unit, for obtaining the lightning parameter of described transmission line of electricity;
Computing unit, for calculating the lightning protection degree of described transmission line of electricity by base shaft tower according to described lightning parameter; And
Setting unit, for arranging the Lightning Protection of described transmission line of electricity according to described lightning protection degree.
6. lightning protection device according to claim 5, is characterized in that,
Described acquiring unit comprises: obtain subelement, for obtaining back flash-over rate and the counterattack trip-out rate of described transmission line of electricity,
Described computing unit comprises: computation subunit, for calculating the lightning protection degree of described transmission line of electricity by base shaft tower according to described back flash-over rate and described counterattack trip-out rate.
7. lightning protection device according to claim 6, is characterized in that, described computation subunit comprises:
First searches module, for searching the indication range residing for described back flash-over rate within the scope of multiple first pre-set level, obtains the first scope;
First acquisition module, for obtaining intensity grade corresponding to described first scope, obtains the first estate;
Second searches module, for searching the indication range residing for described counterattack trip-out rate within the scope of multiple second pre-set level, obtains the second scope;
Second acquisition module, for obtaining intensity grade corresponding to described second scope, obtains the second grade;
3rd searches module, for searching the indication range residing for described back flash-over rate and described counterattack trip-out rate sum within the scope of multiple 3rd pre-set level, obtains the 3rd scope;
3rd acquisition module, for obtaining intensity grade corresponding to described 3rd scope, obtains the tertiary gradient; And
Integration module, for comprehensive described the first estate, described second grade and the described tertiary gradient, obtains the lightning protection degree of described transmission line of electricity.
8. lightning protection device according to claim 7, is characterized in that,
Described multiple first pre-set level scope comprises [0,0.5S
r), [0.5S
r, S
r), [S
r, 1.5S
r) and [1.5S
r, ∞), wherein, S
rbe the first parameter preset,
Described multiple second pre-set level scope comprises [0,0.5S
f), [0.5S
f, S
f), [S
f, 1.5S
f) and [1.5S
f, ∞), wherein, S
fbe the second parameter preset,
Described multiple 3rd pre-set level scope comprises [0,0.5 (S
r+ S
f)), [0.5 (S
r+ S
f), (S
r+ S
f)), [(S
r+ S
f), 1.5 (S
r+ S
f)) and [1.5 (S
r+ S
f), ∞).
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Application publication date: 20160210 |