CN103884935A - Electric transmission line lightning-protection performance assessment method combined with distributed lightning current monitoring - Google Patents
Electric transmission line lightning-protection performance assessment method combined with distributed lightning current monitoring Download PDFInfo
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Abstract
The invention discloses an electric transmission line lightning-protection performance assessment method combined with distributed lightning current monitoring. The method includes the following steps that line corridor lightning characteristic parameters, line characteristic parameters and history lightning stroke fault information are obtained; the tower back striking trip-out rate Pf and tower shield failure trip-out rate Pr of each section under the actual cloud-to-ground lightning intensity are calculated according to the cloud-to-ground lightning intensity of the sections of a line corridor; the lightning trip-out rate assessment index in the electric transmission line operation rule is converted to the average cloud-to-ground lightning intensity of the line, and an actual lightning trip-out rate assessment index S is obtained; S is divided into Sf and Sr according to the occurrence ratio of the back striking trip-out and shield failure trip-out with the history lightning stroke fault information as a reference, and risk grade standards are divided according to the value of Sf and the value of Sr; the intervals of Pf, Pr and risk grades are compared, and the back striking trip-out risk grade and the shield failure trip-out risk grade of each base tower are determined. By the method, the standards of the back striking trip-out risk grade and the shield failure trip-out risk grade can be divided accurately, and the overall lightning-protection performance of the line is assessed.
Description
Technical field
The present invention relates to electrical network lightning protection field, the particularly transmission line of electricity lightning protection properties appraisal procedure based on distributed lightning current monitoring, it is applicable to electric system high pressure, UHV (ultra-high voltage) and the assessment of UHV Overhead Transmission Line lightning protection properties and Lightning Transformation.
Background technology
Security and the economy of transmission line of electricity lightning Protection Design to transmission line of electricity is most important, therefore needs transmission line of electricity to carry out lightning protection assessment.Wherein, lightning current, lightning fault feature and lightning fault point location are the important reference in transmission line of electricity lightning Protection Design, the accurate value of lightning current numerical value, the accurate judgement of lightning fault type and lightning failure point be accurately positioned with the lightning protection properties that helps more scientifically assess high pressure overhead power line.
Lightning current, lightning fault feature and lightning fault point location are for the importance of transmission line of electricity lightning protection properties assessment: one, due to existing lightning current underlying parameter scarcity, cause electrical network lightning Protection Design and construction to lack basic foundation, can only foreign related data or history run experience carry out China's electrical network lightning Protection Design and construction, and lightning current parameter distribution has very strong regional Characteristics, so only depend on foreign related data or history run experience, easily cause to a certain extent electrical network lightning protection device design blindness, cause transmission line lightning stroke trip-out rate high, two, after transmission line lightning stroke tripping operation, substantially adopt at present operating experience judgement in the time differentiating lightning fault type, not only workload is large, and has the possibility of larger erroneous judgement, and counterattack safeguard procedures and Lightning Shielding measure have very big-difference, three, in the past carrying out transmission line malfunction when location, fixing value of wave speed is set conventionally, and actual velocity of wave often changes, therefore cause velocity of wave error, affected localization of fault precision.Therefore, carry out lightning strike accident identification and the differentiation of thunderbolt character, 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 significant based on lightning current Monitoring Data.
Underlying parameters such as lightning current, lightning fault feature and lightning fault point locations of impact for to(for) lightning protection properties assessment, Chinese patent literature disclosed " based on the transmission line of electricity lightning protection properties appraisal procedure of lightning parameter statistics " (patent No. 200810048399.5), the method utilization is carried out lightning protection properties assessment based on lightning location system in the mass data that accumulated aspect the distribution of amplitude of lightning current and ground thunderbolt density.The data of obtaining based on lightning location system are completely carried out lightning protection properties assessment, lightning fault type, shielding risk sources are lacked to careful consideration, concerning the high transmission line of electricity of electric pressure, shielding tripping operation is tripped manyly than counterattack conventionally, and shielding risk sources is needed to careful analysis.Adopt distributed lightning current detection to be and make up wherein deficiency.
Summary of the invention
The technical problem to be solved in the present invention, is just to provide the transmission line of electricity lightning protection properties appraisal procedure in conjunction with distributed lightning current Monitoring Data, lightning location system data and overhead line structures service data.Assessment result is for carrying out Analysis of Lightning Stroke and taking suitable lightning protection measures tool that reference frame is provided.
For solving the problems of the technologies described above, the invention provides a kind of transmission line of electricity lightning protection properties appraisal procedure based on distributed lightning current monitoring device.Described method is obtained circuit from lightning location system and is dodged density, probability of lightning current distribution parameter, obtains tower structure and operation configuration parameter and topography and geomorphology parameter from circuit O&M department, and these parameters will be used for calculating counterattack and shielding trip-out rate by base shaft tower; Obtain historical lightning fault shaft tower information, thunderbolt type and lightning fault position data from distributed lightning current monitoring device, for analysis circuit shielding and counterattack risk ratio and shielding risk sources.
In conjunction with the transmission line of electricity lightning protection properties appraisal procedure of distributed lightning current monitoring, it is characterized in that: comprise the following steps:
(1) obtain circuit corridor Characteristics of Lightning parameter, line characteristics parameter and historical lightning fault information;
(2) according to the each section in circuit corridor dodge density, calculate each section and dodge practically under density shaft tower counterattack trip-out rate Pf and shielding trip-out rate Pr; Performance assessment criteria to tripping rate with lightning strike in transmission line of electricity operations specification is converted to circuit and dodged fifty-fifty under density, obtain actual tripping rate with lightning strike performance assessment criteria S; Meanwhile, with reference to historical lightning fault information, the ratio that S is occurred 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, analyzes shaft tower shielding risk sources according to lightning fault locating information;
(3) relatively strike back trip-out rate Pf, shielding trip-out rate Pr and risk class interval, determine counterattack and the shielding tripping operation risk class of every base shaft tower; In conjunction with shielding and the counterattack tripping operation risk class of all shaft towers, evaluate the lightning protection properties of circuit entirety.
Obtained lightning current data, lightning fault type and the lightning failure point accurate location of each base shaft tower lightning fault by distributed lightning current monitoring device, draw counterattack tripping operation and shielding tripping operation fault ratio, calculate the distance of shielding trouble spot to tower head.
If shielding trouble spot is to the distance x of tower head, for the shaft tower that shielding tripping operation did not occur, the value of x is calculated by weighted mean in full span shielding tripping operation calculating; Note shaft tower large size and the average span of small size side are L, if x≤L/4 judges that shielding tripping operation concentration of risk is in tower head, otherwise judge that shielding tripping operation concentration of risk is in span central authorities.
According to ratio Sf, the Sr of the counterattack tripping operation obtaining and shielding tripping operation generation, mark off between level Four shielding trip-out rate and counterattack trip-out rate standard regions, judge between the shielding trip-out rate Pr of every base shaft tower and standard regions that counterattack trip-out rate Pf falls into, obtain corresponding shielding and counterattack tripping operation risk class;
Shielding trip-out rate between standard regions, be [0, Sr*0.5), [Sr*0.5, Sr*1.0), [Sr*1.0, Sr*1.5), [Sr*1.5, ∞) level Four, corresponding risk class is A, B, C, D respectively;
Counterattack between trip-out rate standard regions be [0, Sf*0.5), [Sf*0.5, Sf*1.0), [Sf*1.0, Sf*1.5), [Sf*1.5, ∞) level Four, the risk class of correspondence is A, B, C, D respectively.
Obtained lightning current data, lightning fault type and the lightning failure point accurate location of each base shaft tower lightning fault by distributed lightning current monitoring device.
The ratio that circuit shielding and counterattack tripping operation occur is from the accurate statistics of distributed lightning current monitoring device, instead of operating experience is general average, embodies the otherness feature of circuit.
Localization of fault by distributed lightning current monitoring device is determined the shielding risk sources that shielding tripping operation occurs.
The beneficial effect that the present invention reaches:
The method of the invention has not only been used the data of lightning location system, has also used the data of lightning current monitoring device, instructs exactly the division of counterattack and shielding risk level standard, evaluates the lightning protection properties of circuit entirety.
Brief description of the drawings
Fig. 1, process flow diagram of the present invention.
Embodiment
Below, by reference to the accompanying drawings 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 been applied for 2 patents, application number is 2012100443123,2013202574571), can obtain the relevant lightning current data that this method needs, using this device circuit completely every 15～20 kilometers install one as monitoring point, device obtains the transient-wave of fault phase electric current to line current sampled measurements, accurately obtain concisely lightning current data, pick out fault type and locate lightning failure point.As shown in Figure 1, the step of method of the present invention comprises:
(1) obtain and add up essential information
Circuit is divided to section, obtain each section from lightning location system and dodge density value N
j(subscript j represents section sequence number), amplitude of lightning current probability distribution function; Obtain each base tower structure feature and insulation configuration parameter, topography and geomorphology from O&M unit; Obtain the thunderbolt categorical data of historical lightning fault from distributed lightning current monitoring device, draw counterattack and shielding fault ratio, statistics shielding trouble spot is to the distance of tower head;
(2) calculate trip-out rate and divide risk level standard
The theoretical method of the existing multiple maturation of Analysis of Lightning Stroke calculating of counterattack and shielding, in the present embodiment, recommendation procedure simulation method hits back to trip and calculates, uses electric geometric model to carry out shielding tripping operation calculating.Counterattack trip-out rate Pf and shielding trip-out rate Pr all use the ground of shaft tower place section to dodge density, and the call parameters such as ground elevation, amplitude of lightning current probability distribution, span, dielectric level are all from (1) step.
With reference to the appraisal standards of relevant voltage grade lightning outage rate in " 110 (66) kV～500kV overhead transmission line management regulation ", convert to circuit and dodge fifty-fifty under density, be designated as S.S is divided into Sf, Sr according to counterattack and shielding fault ratio in (1) step, and counterattack and the shielding tripping operation risk class criteria for classifying are in table 1.
Distance x according to shielding trouble spot in (1) step to tower head, for the shaft tower that shielding tripping operation did not occur, the value of x is calculated by weighted mean in full span shielding tripping operation calculating.Note shaft tower large size and the average span of small size side are L, if x≤L/4 judges that shielding tripping operation concentration of risk is in tower head, otherwise judge that shielding tripping operation concentration of risk is in span central authorities.
Table 1 counterattack and the shielding tripping operation risk class criteria for classifying
(3) assessment shaft tower shielding and counterattack tripping operation risk
The Pr and the Pf that judge every base shaft tower fall into the interval that table 1 is enumerated, and obtain corresponding shielding and counterattack tripping operation risk class.Risk class by A to D show the anti-shielding ability of shaft tower or counterforce capability by by force to a little less than.Shielding tripping operation risk class shows that in A and B level the anti-shielding ability of shaft tower is stronger, and C and D level illustrate that shielding lightning protection properties is undesirable.In like manner, the explanation of counterattack tripping operation risk class is also like this.In conjunction with shielding and the counterattack tripping operation risk class statistics of all shaft towers, can evaluate the lightning protection properties of circuit entirety.
The shielding tripping operation risk sources of adding up in line thunder protection Performance Evaluation result and (2) step, can be used for instructing Analysis of Lightning Stroke and Lightning Transformation, to improve the lightning protection properties of circuit.
Claims (4)
1. in conjunction with the transmission line of electricity lightning protection properties appraisal procedure of distributed lightning current monitoring, it is characterized in that: comprise the following steps:
(1) obtain circuit corridor Characteristics of Lightning parameter, line characteristics parameter and historical lightning fault information;
(2) according to the each section in circuit corridor dodge density, calculate each section and dodge practically under density shaft tower counterattack trip-out rate Pf and shielding trip-out rate Pr; Performance assessment criteria to tripping rate with lightning strike in transmission line of electricity operations specification is converted to circuit and dodged fifty-fifty under density, obtain actual tripping rate with lightning strike performance assessment criteria S; Meanwhile, with reference to historical lightning fault information, the ratio that S is occurred 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, analyzes shaft tower shielding risk sources according to lightning fault locating information;
(3) relatively strike back trip-out rate Pf, shielding trip-out rate Pr and risk class interval, determine counterattack and the shielding tripping operation risk class of every base shaft tower; In conjunction with shielding and the counterattack tripping operation risk class of all shaft towers, evaluate the lightning protection properties of circuit entirety.
2. the transmission line of electricity lightning protection properties appraisal procedure of the distributed lightning current monitoring of combination according to claim 1, it is characterized in that: the lightning current data, lightning fault type and the lightning failure point accurate location that are obtained each base shaft tower lightning fault by distributed lightning current monitoring device, draw counterattack tripping operation and shielding tripping operation fault ratio, calculate the distance of shielding trouble spot to tower head.
3. the transmission line of electricity lightning protection properties appraisal procedure of the distributed lightning current monitoring of combination according to claim 2, is characterized in that: establish the distance of shielding trouble spot to tower head
x, for the shaft tower that shielding tripping operation did not occur,
xvalue calculate by full span shielding tripping operation in weighted mean calculate; Note shaft tower large size and the average span of small size side are
lif,
x≤
l/ 4, judge that shielding tripping operation concentration of risk is in tower head, otherwise judge that shielding tripping operation concentration of risk is in span central authorities.
4. the transmission line of electricity lightning protection properties appraisal procedure of the distributed lightning current monitoring of combination according to claim 1, it is characterized in that: according to ratio Sf, the Sr of the counterattack tripping operation obtaining and shielding tripping operation generation, mark off between level Four shielding trip-out rate and counterattack trip-out rate standard regions, judge between the shielding trip-out rate Pr of every base shaft tower and standard regions that counterattack trip-out rate Pf falls into, obtain corresponding shielding and counterattack tripping operation risk class;
Shielding trip-out rate between standard regions, be [0, Sr*0.5), [Sr*0.5, Sr*1.0), [Sr*1.0, Sr*1.5), [Sr*1.5, ∞) level Four, corresponding risk class is A, B, C, D respectively;
Counterattack between trip-out rate standard regions be [0, Sf*0.5), [Sf*0.5, Sf*1.0), [Sf*1.0, Sf*1.5), [Sf*1.5, ∞) level Four, the risk class of correspondence is A, B, C, D respectively.
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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 |
| CN110320422A (en) * | 2019-07-01 | 2019-10-11 | 国网江西省电力有限公司电力科学研究院 | A kind of leakage conductor Reliability of Microprocessor appraisal procedure based on multi-parameter fusion |
| CN113011098A (en) * | 2021-03-26 | 2021-06-22 | 云南电网有限责任公司电力科学研究院 | Power transmission corridor area lightning activity rule analysis display model and system |
| 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 |
| CN114172131A (en) * | 2021-12-10 | 2022-03-11 | 国网浙江省电力有限公司诸暨市供电公司 | Distribution line lightning stroke section fault assessment method and system |
| CN116151516A (en) * | 2023-01-03 | 2023-05-23 | 湖北能源集团新能源发展有限公司 | New energy external line lightning protection performance evaluation method based on hybrid decision model |
| CN116579617A (en) * | 2023-07-12 | 2023-08-11 | 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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| 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 |
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| 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 |
| CN113011098A (en) * | 2021-03-26 | 2021-06-22 | 云南电网有限责任公司电力科学研究院 | Power transmission corridor area lightning activity rule analysis display model and system |
| 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 |
| CN114172131A (en) * | 2021-12-10 | 2022-03-11 | 国网浙江省电力有限公司诸暨市供电公司 | Distribution line lightning stroke section fault assessment method and system |
| 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 |
| CN116151516A (en) * | 2023-01-03 | 2023-05-23 | 湖北能源集团新能源发展有限公司 | New energy external line lightning protection performance evaluation method based on hybrid decision model |
| 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 |
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