CN103884935B - Transmission line of electricity lightning protection properties appraisal procedure in conjunction with the monitoring of distributed lightning current - Google Patents
Transmission line of electricity lightning protection properties appraisal procedure in conjunction with the monitoring of distributed lightning current Download PDFInfo
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Abstract
The invention discloses the transmission line of electricity lightning protection properties appraisal procedure of a kind of combination distributed lightning current monitoring, comprise the following steps: obtain line corridor Characteristics of Lightning parameter, line characteristics parameter and history lightning fault information；According to line corridor each section CG lightning density, calculate shaft tower counterattack trip-out rate Pf and back flash-over rate Pr under the actual CG lightning density of each section；By the performance assessment criteria of tripping rate with lightning strike is converted to the average CG lightning density of circuit by transmission line of electricity operations specification, obtain actual tripping rate with lightning strike performance assessment criteria S；With reference to history lightning fault information, the ratio that S occurs according to counterattack tripping operation and shielding tripping operation is divided into Sf, Sr, divides risk level standard according to the value of Sf and Sr；Relatively Pf, Pr and risk class is interval, determines counterattack and the shielding trip risk grade of every base shaft tower.The method of the present invention can instruct the division of counterattack and shielding risk level standard exactly, evaluates the lightning protection properties that circuit is overall.
Description
Technical field
The present invention relates to electrical network lightning protection field, be based particularly on the transmission line of electricity of distributed lightning current monitoring
Lightning protection properties appraisal procedure, it is applicable to power system high pressure, supertension and extra-high voltage overhead transmission line
Road lightning protection properties assessment and Lightning Transformation.
Background technology
Transmission line of electricity lightning Protection Design is most important to safety and the economy of transmission line of electricity, it is therefore desirable to right
Transmission line of electricity carries out lightning protection assessment.Wherein, lightning current, lightning fault feature and lightning fault point location
It is the important reference in transmission line of electricity lightning Protection Design, the accurate value of lightning current numerical value, thunderbolt event
Accurately judgement and being accurately positioned of lightning failure point of barrier type contribute to the most scientifically assessing high-pressure frame
The lightning protection properties of empty transmission line of electricity.
Lightning current, lightning fault feature and lightning fault point location are assessed for transmission line of electricity lightning protection properties
Importance is: one, owing to existing lightning current underlying parameter is deficient, causes electrical network lightning Protection Design and executes
Work lacks basic foundation, foreign related data or history run experience can only carry out China's electrical network
Lightning Protection Design and construction, and lightning current parameter distribution has the strongest regional Characteristics, so only by borrowing
Reflect external related data or history run experience, easily cause electrical network lightning protection device to a certain extent and set
Meter blindness, causes transmission line lightning stroke trip-out rate to remain high；Two, after transmission line lightning stroke tripping operation,
Substantially using operating experience to judge when differentiating lightning fault type at present, not only workload is big, and deposits
In the probability of bigger erroneous judgement, and strike back safeguard procedures and Lightning Shielding measure has the biggest difference；
Three, in the past when carrying out transmission open acess, fixing value of wave speed is generally set, and actual ripple
Speed is the most again change, thus results in velocity of wave error, have impact on fault location precision.Therefore, base
In lightning current Monitoring Data carry out lightning strike accident identification and thunderbolt character differentiate, location lightning failure point,
Sum up transmission line lightning stroke fault characteristic, to carrying out Analysis of Lightning Stroke and taking suitable lightning protection measures to have
Significance.
For underlying parameters such as lightning current, lightning fault feature and lightning fault point locations for lightning protection properties
The impact of assessment, disclosed " the transmission line of electricity lightning protection based on lightning parameter statistics of Chinese patent literature
Energy appraisal procedure " (patent No. 200810048399.5), the method utilizes and exists based on lightning location system
Distribution and ground the have accumulated mass data of lightning strike density aspect of amplitude of lightning current carry out lightning protection properties and comment
Estimate.The data being based entirely on lightning location system acquisition carry out lightning protection properties assessment, to lightning fault class
Type, shielding risk sources lack careful consideration, for the transmission line of electricity high to electric pressure, generally
Shielding tripping operation is more more than counterattack tripping operation, and shielding risk sources is needed careful analysis.Use distributed thunder and lightning
Stream detection is and makes up wherein deficiency.
Summary of the invention
The technical problem to be solved in the present invention, it is simply that provide and combine distributed lightning current Monitoring Data, thunder and lightning
The transmission line of electricity lightning protection properties appraisal procedure of alignment system data and overhead line structures service data.Assessment knot
Fruit is for carrying out Analysis of Lightning Stroke and taking suitable lightning protection measures tool to provide reference frame.
For solving above-mentioned technical problem, the present invention provides a kind of based on distributed lightning current monitoring device defeated
Electric line lightning protection properties appraisal procedure.Described method from lightning location system obtain circuit CG lightning density,
Probability of lightning current distributed constant, obtains tower structure from circuit O&M department and runs configuration parameter and ground
Shape landforms parameter, these parameters will be used for calculating counterattack and back flash-over rate by base shaft tower；From distributed
Lightning current monitoring device obtains history lightning fault shaft tower information, thunderbolt type and lightning fault positional number
According to, for analysis circuit shielding and counterattack risk ratio and shielding risk sources.
Transmission line of electricity lightning protection properties appraisal procedure in conjunction with the monitoring of distributed lightning current, it is characterised in that: bag
Include following steps:
(1) line corridor Characteristics of Lightning parameter, line characteristics parameter and history lightning fault information are obtained；
(2) according to line corridor each section CG lightning density, shaft tower under the actual CG lightning density of each section is calculated
Counterattack trip-out rate Pf and back flash-over rate Pr；Tripping rate with lightning strike will be examined by transmission line of electricity operations specification
Core index is converted to the average CG lightning density of circuit, obtains actual tripping rate with lightning strike performance assessment criteria S；Meanwhile,
With reference to history lightning fault information, by S according to the ratio that counterattack tripping operation and shielding tripping operation occur be divided into Sf,
Sr, divides risk level standard according to the value of Sf and Sr, positions information analysis shaft tower according to lightning fault
Shielding risk sources；
(3) compare counterattack trip-out rate Pf, back flash-over rate Pr and risk class is interval, determine every base
The counterattack of shaft tower and shielding trip risk grade；Shielding and counterattack trip risk etc. in conjunction with all shaft towers
Level, evaluates the lightning protection properties that circuit is overall.
The lightning current data of each base shaft tower lightning fault, thunderbolt is obtained by distributed lightning current monitoring device
Fault type and lightning failure point accurate location, draw counterattack tripping operation and shielding tripping fault ratio, meter
Calculate the shielding trouble point distance to tower head.
If shielding trouble point is to distance x of tower head, for the shaft tower not occurring shielding to trip, the value of x
In being calculated by full span shielding tripping operation, weighted average calculates；The average shelves of note shaft tower large size and small size side
Away from for L, if x≤L/4, then judge that shielding trip risk concentrates on tower head, otherwise judge that shielding is tripped wind
Danger concentrates on span central authorities.
According to the counterattack tripping operation obtained and ratio Sf of shielding tripping operation generation, Sr, mark off level Four shielding
Trip-out rate and counterattack trip-out rate standard are interval, it is judged that the back flash-over rate Pr of every base shaft tower and counterattack tripping operation
The standard that rate Pf falls into is interval, obtains corresponding shielding and counterattack trip risk grade；
Back flash-over rate standard interval be [0, Sr*0.5), [Sr*0.5, Sr*1.0), [Sr*1.0, Sr*1.5),
[Sr*1.5, ∞) level Four, risk class corresponding respectively is A, B, C, D；
Counterattack trip-out rate standard interval be [0, Sf*0.5), [Sf*0.5, Sf*1.0), [Sf*1.0, Sf*1.5),
[Sf*1.5, ∞) level Four, risk class corresponding respectively is A, B, C, D.
The lightning current data of each base shaft tower lightning fault, thunderbolt event is obtained by distributed lightning current monitoring device
Barrier type and lightning failure point accurate location.
The ratio that circuit shielding and counterattack tripping operation occur is from the accurate system of distributed lightning current monitoring device
Meter rather than operating experience universal average, embodies the diversity feature of circuit.
The shielding risk that shielding tripping operation occurs is determined by the fault location of distributed lightning current monitoring device
Source.
The beneficial effect that the present invention is reached:
The method of the invention not only used the data of lightning location system, also uses lightning current monitoring
The data of device, instruct the division of counterattack and shielding risk level standard exactly, evaluate circuit whole
The lightning protection properties of body.
Accompanying drawing explanation
Fig. 1, the flow chart of the present invention.
Detailed description of the invention
Below, in conjunction with accompanying drawing, embodiments of the invention are further described.
The distributed lightning current monitoring device that the present invention uses is that the existing product of buying (has applied for 2
Patent, Application No. 2012100443123,2013202574571), can obtain what this method needed
Relevant lightning current data, using this device circuit completely the most every 15～20 kilometers install one as monitoring point,
Device obtains the transient-wave of faulted phase current to line current sampled measurements, obtains thunder the most concisely
Current data, picks out fault type and positions lightning failure point.As it is shown in figure 1, the side of the present invention
The step of method includes:
(1) obtain and add up essential information
Circuit is divided section, obtains each section CG lightning density value N from lightning location systemj(subscript j table
Show section sequence number), amplitude of lightning current probability-distribution function；Each base shaft tower structure is obtained special from O&M unit
Insulation configuration of seeking peace parameter, topography and geomorphology；History thunderbolt event is obtained from distributed lightning current monitoring device
The thunderbolt categorical data of barrier, show that counterattack and shielding defective proportion, statistics shielding trouble point arrive tower head
Distance；
(2) calculate trip-out rate and divide risk level standard
The Analysis of Lightning Stroke of counterattack and shielding calculates the theoretical method of existing multiple maturation, recommends in the present embodiment
Tripping operation calculates, use electric geometry method carries out shielding tripping operation and calculates to use procedure simulation method to hit back.
Counterattack trip-out rate Pf and back flash-over rate Pr all uses the CG lightning density of shaft tower place section, ground elevation,
The call parameters such as amplitude of lightning current probability distribution, span, dielectric level are then all from (1st) step.
With reference to relevant voltage grade line in " 110 (66) kV～500kV overhead transmission line management regulation "
The appraisal standards of road tripping rate with lightning strike, convert to the average CG lightning density of circuit, are designated as S.By S according to
In (1st) step, counterattack and shielding defective proportion are divided into Sf, Sr, and counterattack and shielding trip risk grade are drawn
Minute mark standard is shown in Table 1.
According to shielding trouble point in (1st) step to distance x of tower head, for the bar not occurring shielding to trip
Tower, during the value of x is calculated by full span shielding tripping operation, weighted average calculates.Note shaft tower large size and trumpet
The average span in side is L, if x≤L/4, then judges that shielding trip risk concentrates on tower head, otherwise judge around
Hit trip risk and concentrate on span central authorities.
Table 1 counterattack and shielding trip risk grading standard
(3) assessment shaft tower shielding and counterattack trip risk
Judge that Pr and Pf of every base shaft tower falls into the interval enumerated in table 1, obtain corresponding shielding with anti-
Hit trip risk grade.By A to D, risk class shows that shaft tower anti-shielding ability or counterforce capability are by by force
To weak.Shielding trip risk grade is in A and B level and shows that shaft tower anti-shielding ability is relatively strong, C and D
Level then explanation shielding failure protection performance is undesirable.In like manner, the explanation of counterattack trip risk grade is the most such.
Shielding and counterattack trip risk grade statistics in conjunction with all shaft towers, it can be estimated that go out overall the preventing of circuit
Thunder performance.
In line thunder protection performance evaluation result and (2nd) step, the shielding trip risk source of statistics, can be used for referring to
Lead Analysis of Lightning Stroke and Lightning Transformation, to improve the lightning protection properties of circuit.
Claims (2)
1. combine the transmission line of electricity lightning protection properties appraisal procedure of distributed lightning current monitoring, it is characterised in that: comprise the following steps:
(1) line corridor Characteristics of Lightning parameter, line characteristics parameter and history lightning fault information are obtained；
(2) according to line corridor each section CG lightning density, shaft tower counterattack trip-out rate Pf and back flash-over rate Pr under the actual CG lightning density of each section is calculated；By the performance assessment criteria of tripping rate with lightning strike is converted to the average CG lightning density of circuit by transmission line of electricity operations specification, obtain actual tripping rate with lightning strike performance assessment criteria S；Meanwhile, with reference to history lightning fault information, the ratio that S occurs according to counterattack tripping operation and shielding tripping operation is divided into Sf, Sr, divides risk level standard according to the value of Sf and Sr, position information analysis shaft tower shielding risk sources according to lightning fault；
(3) compare counterattack trip-out rate Pf, back flash-over rate Pr and risk class is interval, determine counterattack and the shielding trip risk grade of every base shaft tower；In conjunction with shielding and the counterattack trip risk grade of all shaft towers, evaluate the lightning protection properties that circuit is overall；
Obtained the lightning current data of each base shaft tower lightning fault, lightning fault type and lightning failure point accurate location by distributed lightning current monitoring device, draw counterattack tripping operation and shielding tripping fault ratio, calculate the shielding trouble point distance to tower head；
If shielding trouble point is to the distance of tower headx, for the shaft tower not occurring shielding to trip,xValue by full span shielding tripping operation calculate weighted average calculate；The average span of note shaft tower large size and small size side isLIf,x ≤ L/ 4, then judge that shielding trip risk concentrates on tower head, otherwise judge that shielding trip risk concentrates on span central authorities.
The transmission line of electricity lightning protection properties appraisal procedure of combination the most according to claim 1 distributed lightning current monitoring, it is characterized in that: according to the counterattack tripping operation obtained and ratio Sf of shielding tripping operation generation, Sr, mark off level Four back flash-over rate and counterattack trip-out rate standard is interval, judge that the standard that the back flash-over rate Pr and counterattack trip-out rate Pf of every base shaft tower fall into is interval, obtain corresponding shielding and counterattack trip risk grade；
Back flash-over rate standard interval be [0, Sr*0.5), [Sr*0.5, Sr*1.0), [Sr*1.0, Sr*1.5), [Sr*1.5, ∞) level Four, risk class corresponding respectively is A, B, C, D；
Counterattack trip-out rate standard interval be [0, Sf*0.5), [Sf*0.5, Sf*1.0), [Sf*1.0, Sf*1.5), [Sf*1.5, ∞) level Four, respectively correspondence risk class be A, B, C, D.
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| CN105321027A (en) * | 2014-08-04 | 2016-02-10 | 国家电网公司 | Lightning protection method and apparatus for power transmission line |
| CN108594047A (en) * | 2018-06-08 | 2018-09-28 | 国家电网公司 | A method of based on transmission line of electricity damage to crops caused by thunder dangerous point risk identification |
| CN110320422B (en) * | 2019-07-01 | 2021-07-02 | 国网江西省电力有限公司电力科学研究院 | Line arrester action reliability assessment method based on multi-parameter fusion |
| CN113011098B (en) * | 2021-03-26 | 2023-09-01 | 云南电网有限责任公司电力科学研究院 | Lightning activity rule analysis display model and system for power transmission corridor area |
| CN113933704A (en) * | 2021-09-26 | 2022-01-14 | 珠海格力电器股份有限公司 | Method and system for online monitoring of motor state |
| CN114172131B (en) * | 2021-12-10 | 2024-04-05 | 国网浙江省电力有限公司诸暨市供电公司 | Distribution line lightning stroke section fault evaluation method and system |
| CN116151516B (en) * | 2023-01-03 | 2024-04-02 | 湖北能源集团荆门象河风电有限公司 | New energy external line lightning protection performance evaluation method based on hybrid decision model |
| CN116579617B (en) * | 2023-07-12 | 2023-11-03 | 国网山东省电力公司邹城市供电公司 | Power grid risk assessment method and system |
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| CN101315400B (en) * | 2008-07-15 | 2010-09-08 | 国网武汉高压研究院 | Electric power line lightning protection performance estimation method based on thunder and lightning parametric statistics |
| EP2190092A2 (en) * | 2008-11-19 | 2010-05-26 | Vestas Wind Systems A/S | Improved lightning protection system for wind turbines |
| CN102967785A (en) * | 2012-11-30 | 2013-03-13 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for evaluating lightning protection performance of high-speed railway traction network |
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