CN103810339A - Method for determining lightening counterattack performance of long span section of ultra-high voltage transmission line - Google Patents
Method for determining lightening counterattack performance of long span section of ultra-high voltage transmission line Download PDFInfo
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Abstract
The invention relates to a method for determining lightening counterattack performance of a long span section of an ultra-high voltage transmission line. The method includes the steps of building a lightening stroke simulation module, determining the probability that a lightening current amplitude is larger than a line lightening-resistant level, determining ground lightening times of the transmission line every hundred kilometer every year, determining the probability that lightening strikes a tower top of a tower, determining the probability that lightening impulse flashover is converted into a stable power frequency arc, and determining the counterattack trip-out rate of the ultra-high voltage transmission line. According to the method, subsection distribution parameter modeling is carried out on the long span tower, and simulation calculation precision of the lightening counterattack performance is improved.
Description
Technical field:
The present invention relates to a kind of definite method of back flashover performance, more specifically relate to a kind of definite method of UHV transmission line big across back flashover performance.
Background technology:
The back flashover performance of transmission line of electricity is an important step of assessment Transmission Line Design, and associated mechanisms mostly carries out simulation study based on electromagnetic transient state procedure EMTP to the back flashover performance of transmission line of electricity in the world.Through years of researches and application, form a series of emulated computation methods that are applicable to UHV (ultra-high voltage) and following electric pressure electrical network, and be widely used in the design of China's supergrid engineering.According to China " 12 " planning, the construction of China 1000kV extra-high voltage grid is by fully under way.Along with the rising of transmission line of electricity electric pressure, the shaft tower of power transmission line is higher, and line span is longer, and its lightning performance has also had new feature.And the tower height of the large leap of extra-high voltage is higher, wire crossing span is longer, and shaft tower and ground wire cause upward leader and cause the probability of thunderbolt very high, and not easy-maintaining occurs after lightning strike accident, need to change power equipment.
Because domestic and international relevant criterion does not propose clear and definite method and needs the factor of considering the calculating of the large leap lightning performance of extra-high voltage, carrying out the thunder and lightning assessment Zhong Ge institute of the large leap of extra-high voltage and colleges and universities and all proposed the emulated computation method of oneself.But the emulated computation method proposing is the correction of carrying out Tower Model on standard (GB Z24842-2009) stipulates the computing method of general circuit mostly, fail to consider the feature of the large leap of extra-high voltage comprehensively, form a set of computational accuracy high, can be applied to the calculating emulation mode that instructs engineering design.
So be necessary the calculating appraisal procedure to proposing a kind of UHV transmission line big across back flashover performance.
Summary of the invention:
A kind of definite method that the object of this invention is to provide UHV transmission line big across back flashover performance, the method has improved definite precision of back flashover performance.
For achieving the above object, the present invention is by the following technical solutions: a kind of definite method of UHV transmission line big across back flashover performance, said method comprising the steps of:
(1) set up lightning stroke simulation model;
(2) determine that amplitude of lightning current is greater than the probability of line lightning resisting level;
(3) determine the annual thunderbolt number of times of per 100 km of transmission line of electricity;
(4) determine and be struck by lightning in the probability of shaft tower tower top;
(5) determine that thunderbolt impulse flashover transfers the probability of stablizing power frequency arc to;
(6) determine the counterattack trip-out rate of extra-high voltage big across transmission line of electricity.
Definite method of a kind of UHV transmission line big across back flashover performance provided by the invention, the lightning stroke simulation model in described step (1) comprises wire ground line model, Tower Model, every base shaft tower wire flashover model and the lightning models of transmission line of electricity; Extra-high voltage long span transmission line structure, the anchor tower of its both sides and the shaft tower in described anchor tower outside of described lightning stroke simulation model to distribute from inside to outside, totally 10 base shaft towers are simulation modeling object.
Definite method of a kind of UHV transmission line big across back flashover performance provided by the invention, the wire ground line model of described transmission line of electricity is to determine method according to the design conditions of line wire and ground wire by Bei Jielong numerical value, the circuit distributed constant circuit model of setting up between the each span between described 10 base shaft towers respectively; The wire of the big across between described each span is divided into 10 sections of different circuits of average height and carries out modeling.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, described Tower Model carries out modeling according to the harmless circuit of the main material of shaft tower and cross-arm length, and the multi-wave impedance model of the every base shaft tower obtaining by segmentation wave impedance computing formula and lightning wave velocity of propagation.
Definite method of a preferred a kind of UHV transmission line big across back flashover performance more provided by the invention, described every base shaft tower wire flashover model is the lightning surge clearance discharge switch model of setting up on the basis of described Tower Model; Described lightning surge clearance discharge switch model adopts crossing method to judge on off state.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, in the time determining the large cross line of transmission line of electricity of common-tower double-return, every phase conductor comprises different conductor spacing flashover paths, is the conductor spacing flashover path along the electric discharge of insulator gap flashover, the conductor spacing flashover path to tower body electric discharge and the conductor spacing flashover path that below cross-arm is discharged.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, described lightning models is determined amplitude of lightning current and the foundation of lightning channel wave impedance by the lightening activity situation of described transmission line of electricity location.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, the transmission line of electricity long span transmission line structure tower top and the central also through type (1) of ground wire span that lightning current are acted on respectively to lightning stroke simulation model are determined the probability in described step (2):
In formula, P
jfor the lightning withstand level probability of circuit in each phase angle interval, n
1represent the phase angle of 1 power frequency period to be divided into n
1individual phase angle interval, n
1=12.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, is characterized in that: the thunderbolt number of times through type (2) in described step (3) is determined:
In formula, h
tfor the height of shaft tower, unit is rice; B is two distances between ground wire, and unit is rice.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, the probability in described step (4) is determined by transmission line of electricity place landform.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, the probability through type (3) in described step (5) is determined:
η=（4.5E
0.75-14）×10
-2 （3）
In formula,
u
nfor system rated voltage, l is line insulator string length.
Definite method of another preferred a kind of UHV transmission line big across back flashover performance provided by the invention, is characterized in that: the counterattack trip-out rate through type (4) in described step (3) is determined:
n＝N
LηPg。（4）
In formula, N
lfor the annual thunderbolt number of times of the per 100 km of transmission line of electricity, η is that thunderbolt impulse flashover transfers the probability of stablizing power frequency arc to, and P is the probability that amplitude of lightning current is greater than line lightning resisting level, and g is the probability being struck by lightning in shaft tower tower top; The unit of described counterattack trip-out rate is inferior/100 km years.
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
1, in the present invention, wire in long span transmission line structure and shelves is carried out to the modeling of segmentation distributed parameter model, improved the simulation calculation precision of back flashover performance;
2, in calculating of the present invention, consider that the probability of up thunder occurs long span transmission line structure, solved the classic method calculated value problem bigger than normal than the actual running results, provide theoretical foundation for effectively reducing the large construction cost of crossing over;
3, in the present invention, calculate the catadioptric situation of lightning wave on long span transmission line structure, anchor tower, both sides shaft tower and ground wire thereof, take into full account the wave process that lightning wave is propagated;
4, the present invention, in the time calculating the large cross line of common-tower double-return, considers 3 different conductor spacing flashover paths, is respectively along the electric discharge of insulator surface gap flashover, tower body is discharged and below cross-arm is discharged; Find out the weak location of circuit counterattack tripping operation, for science design and the Insulation Coordination design of tower structure provide theoretical foundation;
5, in calculating of the present invention, consider the variation of the operating voltage instantaneous value of large cross line, 0 °～360 °, operating voltage phasing degree is divided into 12 phasing degree, trip-out rate while calculating each phasing degree, improve the simulation calculation precision of back flashover performance, made result of calculation be applicable to instruct the science design of engineering.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is of the present invention thunderbolt in the simulation modeling object schematic diagram of long span transmission line structure tower top;
Fig. 3 is of the present invention thunderbolt in the simulation modeling object schematic diagram of big across ground wire span central authorities;
Fig. 4 is the multi-wave impedance model schematic diagram of common-tower double-return shaft tower of the present invention;
Fig. 5 is many discharge paths schematic diagram of extra-high voltage same tower double circuit shaft tower of the present invention;
Fig. 6 is lightning models schematic diagram of the present invention;
Fig. 7 is the schematic diagram that is related to of lightning current channel impedance of the present invention and amplitude of lightning current.
Embodiment
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in Fig. 1-7, definite method of this routine invention UHV transmission line big across back flashover performance, comprises the following steps:
(1) set up lightning stroke simulation model;
(2) determine that amplitude of lightning current is greater than the probability of line lightning resisting level;
(3) determine the annual thunderbolt number of times of per 100 km of transmission line of electricity;
(4) determine and be struck by lightning in the probability of shaft tower tower top;
(5) determine that thunderbolt impulse flashover transfers the probability of stablizing power frequency arc to;
(6) determine the counterattack trip-out rate of extra-high voltage big across transmission line of electricity.
Lightning stroke simulation model in described step (1) comprises wire ground line model, Tower Model, every base shaft tower wire flashover model and the lightning models of transmission line of electricity; Extra-high voltage long span transmission line structure, the anchor tower of its both sides and the shaft tower in described anchor tower outside of described lightning stroke simulation model to distribute from inside to outside, totally 10 base shaft towers are simulation modeling object.
The wire ground line model of described transmission line of electricity is to determine method according to the design conditions of line wire and ground wire by Bei Jielong numerical value, the circuit distributed constant circuit model of setting up between the each span between described 10 base shaft towers respectively; Consider the feature that its span is large, line-sag is long, the wire of the big across between described each span is divided into 10 sections of different circuits of average height and carries out modeling.Under the prerequisite of computational accuracy that guarantees engineering, be lumped parameter original paper by the distribution parameter original paper equivalence of described transmission line of electricity, so that wave process general, that relatively simple lumped parameter numerical method calculates research thunder and lightning;
For the singularity of extra-high voltage big across circuit, set up the Segmentation Model of big across wire, consider folding, the reflection process of lightning wave on same section lead (large crossing span is apart from interior) diverse location, improve the simulation calculation precision of back flashover performance;
Increase the research quantity of described long span transmission line structure both sides shaft tower, consider more fully the wave process that lightning wave is propagated, improved the simulation calculation precision of back flashover performance.
According to anchor tower and the shaft tower totally 10 base shaft towers of described extra-high voltage long span transmission line structure, its both sides, front and back, project organization as shown in Figures 2 and 3, described Tower Model is to consider that the main material of shaft tower and the harmless circuit of cross-arm length carry out modeling, and the multi-wave impedance model that passes through every base shaft tower that segmentation wave impedance computing formula and lightning wave velocity of propagation obtain of recommending according to IEEE, as shown in Figure 4.
For the very high feature of extra-high voltage long span transmission line structure height, shaft tower each several part, the different wave impedance of each section are segmented, consider folding, the reflection process of lightning wave on tower body, when reflection thunderbolt, the voltage of tower body diverse location distributes, and has improved the simulation calculation precision of back flashover performance.
Described every base shaft tower wire flashover model is the lightning surge clearance discharge switch model of setting up on the basis of described Tower Model; Described lightning surge clearance discharge switch model adopts crossing method to judge on off state, calculate the superpotential at shaft tower clearance for insulation two ends, it and insulation lightning impulse electric discharge voltage-time curve are compared, and both intersect, and think this insulation generation flashover.In the time determining the large cross line of transmission line of electricity of common-tower double-return, every phase conductor comprises different conductor spacing flashover paths, for the conductor spacing flashover path along the electric discharge of insulator gap flashover, the conductor spacing flashover path to tower body electric discharge and the conductor spacing flashover path that below cross-arm is discharged, as shown in Figure 5.
The characteristic distributions of current potential while thunderbolt for extra-high voltage long span transmission line structure, sets up many flashovers discharge channel model of wire, makes simulation process more approach practical operating experiences.Improve the simulation calculation precision of back flashover performance.Find out the weak location of circuit counterattack tripping operation, for science design and the Insulation Coordination design of tower structure provide theoretical foundation.
The lightening activity situation secundum legem of described lightning models by described transmission line of electricity location (GB Z24842-2009) determines that amplitude of lightning current and lightning channel wave impedance set up, as shown in Figure 6; Fig. 7 is the relation of lightning current channel impedance and amplitude of lightning current.The value of lightning current channel wave impedance is mapped in different amplitude of lightning current situations, has improved the simulation calculation precision of back flashover performance.
Above-mentioned model is communicated with into a complete prototype network, lightning current is acted on respectively to transmission line of electricity long span transmission line structure tower top and the ground wire span central authorities of lightning stroke simulation model, as shown in Figures 2 and 3, calculate the back flashover lightning withstand level (I of large cross line based on electromagnetic transient simulation calculation procedure
1), and calculate amplitude of lightning current and be greater than I
1probability (P
j).
When calculating, power frequency operating voltage instantaneous value (phase angle) is by being uniformly distributed consideration, and the probability coming across while thunderbolt in arbitrary phase angle interval of power frequency period equates.In research, the phase angle of 1 power frequency period is divided into n
1individual phase angle interval, statistic law is calculated amplitude of lightning current and is greater than line lightning resisting level probability P and is:
Through type (1) is determined the probability in described step (2):
In formula, P
jfor the lightning withstand level probability of circuit in each phase angle interval, n
1represent the phase angle of 1 power frequency period to be divided into n
1individual phase angle interval, n
1=12, be a kind of state every 30 ° of phase angles, in calculating, need to calculate respectively 12 kinds of lightning withstand levels under phase angle state.This step is the core that lightning performance is calculated, based on electromagnetic transient state procedure, above-mentioned realistic model is carried out to Computing and obtains large cross line and do not occur the maximum amplitude of lightning current of flashover, be lightning withstand level, provide crucial calculating parameter for calculating counterattack trip-out rate.
Thunderbolt number of times (N in described step (3)
l) through type (2) determine:
In formula, h
tfor the height of shaft tower, unit is rice; B is two distances between ground wire, and unit is rice; Provide necessary calculating parameter for calculating counterattack trip-out rate.
Probability in described step (4) is determined by transmission line of electricity place landform, is hit bar rate g; Provide necessary calculating parameter for calculating counterattack trip-out rate.
Probability in described step (5), i.e. probability of sustained arc (η); Through type (3) is determined:
η=（4.5E
0.75-14）×10
-2 （3）
In formula,
u
nfor system rated voltage, l is line insulator string length; Provide necessary calculating parameter for calculating counterattack trip-out rate.
Finally, according to above-mentioned result of calculation, be calculated as follows the counterattack trip-out rate (n) that obtains extra-high voltage big across circuit, the counterattack trip-out rate through type (4) in described step (3) is determined:
n＝N
LηPg。（4）
In formula, N
lfor the annual thunderbolt number of times of the per 100 km of transmission line of electricity, η is that thunderbolt impulse flashover transfers the probability of stablizing power frequency arc to, and P is the probability that amplitude of lightning current is greater than line lightning resisting level, and g is the probability being struck by lightning in shaft tower tower top; The unit of described counterattack trip-out rate is inferior/100 km years.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of this claim scope.
Claims (12)
1. a definite method for UHV transmission line big across back flashover performance, is characterized in that: said method comprising the steps of:
(1) set up lightning stroke simulation model;
(2) determine that amplitude of lightning current is greater than the probability of line lightning resisting level;
(3) determine the annual thunderbolt number of times of per 100 km of transmission line of electricity;
(4) determine and be struck by lightning in the probability of shaft tower tower top;
(5) determine that thunderbolt impulse flashover transfers the probability of stablizing power frequency arc to;
(6) determine the counterattack trip-out rate of extra-high voltage big across transmission line of electricity.
2. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 1, is characterized in that: the lightning stroke simulation model in described step (1) comprises wire ground line model, Tower Model, every base shaft tower wire flashover model and the lightning models of transmission line of electricity; Extra-high voltage long span transmission line structure, the anchor tower of its both sides and the shaft tower in described anchor tower outside of described lightning stroke simulation model to distribute from inside to outside, totally 10 base shaft towers are simulation modeling object.
3. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 2, it is characterized in that: the wire ground line model of described transmission line of electricity is to determine method according to the design conditions of line wire and ground wire by Bei Jielong numerical value, the circuit distributed constant circuit model of setting up between the each span between described 10 base shaft towers respectively; The wire of the big across between described each span is divided into 10 sections of different circuits of average height and carries out modeling.
4. definite method of a kind of UHV transmission line big across back flashover performance as described in claim 2 shaft tower, it is characterized in that: described Tower Model carries out modeling according to the harmless circuit of the main material of shaft tower and cross-arm length, and the multi-wave impedance model of the every base shaft tower obtaining by segmentation wave impedance computing formula and lightning wave velocity of propagation.
5. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 4, is characterized in that: described every base shaft tower wire flashover model is the lightning surge clearance discharge switch model of setting up on the basis of described Tower Model; Described lightning surge clearance discharge switch model adopts crossing method to judge on off state.
6. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 5, it is characterized in that: in the time determining the large cross line of transmission line of electricity of common-tower double-return, every phase conductor comprises different conductor spacing flashover paths, is the conductor spacing flashover path along the electric discharge of insulator gap flashover, the conductor spacing flashover path to tower body electric discharge and the conductor spacing flashover path that below cross-arm is discharged.
7. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 2, is characterized in that: described lightning models is determined amplitude of lightning current and the foundation of lightning channel wave impedance by the lightening activity situation of described transmission line of electricity location.
8. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 1, is characterized in that: the transmission line of electricity long span transmission line structure tower top and the central also through type (1) of ground wire span that lightning current are acted on respectively to lightning stroke simulation model are determined the probability in described step (2):
In formula, P
jfor the lightning withstand level probability of circuit in each phase angle interval, n
1represent the phase angle of 1 power frequency period to be divided into n
1individual phase angle interval, n
1=12.
9. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 1, is characterized in that: the thunderbolt number of times through type (2) in described step (3) is determined:
In formula, h
tfor the height of shaft tower, unit is rice; B is two distances between ground wire, and unit is rice.
10. definite method of a kind of UHV transmission line big across back flashover performance as claimed in claim 1, is characterized in that: the probability in described step (4) is determined by transmission line of electricity place landform.
Definite method of 11. a kind of UHV transmission line big across back flashover performances as claimed in claim 1, is characterized in that: the probability through type (3) in described step (5) is determined:
η=（4.5E
0.75-14）×10
-2 （3）
In formula,
u
nfor system rated voltage, l is line insulator string length.
Definite method of 12. a kind of UHV transmission line big across back flashover performances as claimed in claim 1, is characterized in that: the counterattack trip-out rate through type (4) in described step (3) is determined:
n＝N
LηPg。（4）
In formula, N
lfor the annual thunderbolt number of times of the per 100 km of transmission line of electricity, η is that thunderbolt impulse flashover transfers the probability of stablizing power frequency arc to, and P is the probability that amplitude of lightning current is greater than line lightning resisting level, and g is the probability being struck by lightning in shaft tower tower top; The unit of described counterattack trip-out rate is inferior/100 km years.
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| CN105868872B (en) * | 2016-05-30 | 2019-08-06 | 东北大学 | A kind of power distribution network Lightning Disaster failure prediction method |
| CN106199354B (en) * | 2016-06-24 | 2018-12-28 | 国网浙江省电力公司金华供电公司 | Insulator chain parallel connection gaps lightning impulse validity and flash-over characteristic test method |
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| CN107918705B (en) * | 2017-11-14 | 2020-09-18 | 山东电力工程咨询院有限公司 | Method for calculating installation necessity of overhead line arrester |
| CN111597697A (en) * | 2020-05-08 | 2020-08-28 | 国网山东省电力公司电力科学研究院 | Extra-high voltage same-tower double-circuit line arrester arrangement optimization method |
| CN111597697B (en) * | 2020-05-08 | 2024-02-02 | 国网山东省电力公司电力科学研究院 | Arrangement optimization method for extra-high voltage same-tower double-circuit line lightning arresters |
| CN112487670A (en) * | 2020-12-25 | 2021-03-12 | 国网山东省电力公司电力科学研究院 | Generation method of lightning overvoltage simulation model of large-span high tower |
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| CN112883333B (en) * | 2021-01-12 | 2023-06-30 | 云南电网有限责任公司电力科学研究院 | Lightning probability calculation method and device |
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| CN113688494B (en) * | 2021-06-17 | 2022-11-11 | 云南电网有限责任公司德宏供电局 | Calculation method for power-frequency follow current interruption capacity of multi-cavity arc extinguishing device |
| CN113836856A (en) * | 2021-10-21 | 2021-12-24 | 中国电力工程顾问集团西北电力设计院有限公司 | 750kV one-tower double-loop ultrahigh tower lightning protection design method |
| CN113836856B (en) * | 2021-10-21 | 2023-06-09 | 中国电力工程顾问集团西北电力设计院有限公司 | 750kV same-tower double-loop ultra-high tower lightning protection design method |
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