CN203838288U - Lightning stroke shielding failure and back flashover identification apparatus for AC/DC power transmission line - Google Patents
Lightning stroke shielding failure and back flashover identification apparatus for AC/DC power transmission line Download PDFInfo
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- CN203838288U CN203838288U CN201420160636.8U CN201420160636U CN203838288U CN 203838288 U CN203838288 U CN 203838288U CN 201420160636 U CN201420160636 U CN 201420160636U CN 203838288 U CN203838288 U CN 203838288U
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Abstract
The utility model discloses a lightning stroke shielding failure and back flashover identification apparatus for AC/DC power transmission lines. The lightning stroke shielding failure and back flashover identification apparatus comprises a lightning current sensor A (1), a lightning current sensor B (2), a lightning current sensor C (3), a traveling wave fault analyzing and ranging module (4), a GPS synchronized clock (5) and a data transmission module (6). On the basis of identifying lightning stroke shielding failure and back flashover on AC power transmission lines, the lightning stroke shielding failure and back flashover identification apparatus also can identify lightning stroke shielding failure and back flashover on extra-high voltage DC power transmission lines, and can distinguish lightning stroke shielding failure and back flashover to provide important data support for lightning protection of power lines and operation and maintenance reference for power lines.
Description
Technical field
The utility model belongs to lightning protection field, relates in particular to a kind of AC and DC transmission line thunderbolt and counterattack recognition device.
Background technology
China's lightening activity is very frequent, and power outage is usually occurred because being struck by lightning transmission line of electricity.Lightning fault is one of modal accident of transmission line of electricity, has had a strong impact on the safety and reliability of electric power supply.No matter thunder and lightning is that direct lightning strike (thunder and lightning drops on circuit itself) is still responded near thunder (thunder and lightning drops on circuit), all likely causes line insulator flashover, and then causes earth fault, causes power outage, affects social production.Therefore transmission line of electricity is all attached great importance to lightning protection from being designed into maintenance.In the design phase, need to design according to lightning information parameter the series of parameters such as Insulation Coordination, earth-wire protection angle of transmission line of electricity.Yet lightening activity belongs to small probability event, parameter has strong randomness, and thunderbolt characteristic need to be added up from a large amount of measured datas.Meanwhile, the real information of lightening activity is owing to paying close attention to the shortage that causes not detection means, to such an extent as to data acquisition amount is not enough far away.Usually there is lightning strike accident in the transmission line of electricity according to lightning information design not bery accurately at present, therefore, the collection of thunderbolt event True Data is seemed to particularly important.
Operating experience shows both at home and abroad, direct lightning strike is the main cause that causes ultra-high-tension power transmission line tripping operation, and it is divided into shielding and counterattack two classes, and shielding is different from mechanism and the process of counterattack fault, safeguard procedures are also different, and counterattack is main relevant with line insulation intensity with pole tower ground resistance; Shielding is main relevant with shielding angle.If circuit shielding and counterattack are correctly judged, line thunder protection just can be shot the arrow at the target, get twice the result with half the effort.
Yet, for transmission line of electricity shielding, counterattack fault distinguish very difficult.The research of shielding, counterattack is concentrated on to the line design stage mostly: for counterattack, great majority adopt electromagnetic transient simulation analysis; For shielding, great majority adopt electric geometric model method or improved electro-geometrical model to analyze.And after circuit puts into operation, mostly the differentiation of shielding, counterattack fault be according to lightning current size and judged by engineering staff's experience in conjunction with insulator arc-over situation, its subjectivity is strong, credible poor.Insulator arc-over occurs when transmission line of electricity is struck by lightning, and its flashover path has two kinds.The first is shielding path---thunder and lightning " is walked around " lightning conducter, hits transmission pressure, and the flashover electric arc of lightning current from transmission pressure along insulator surface flows to shaft tower, finally along shaft tower, flows into the earth, referring to accompanying drawing 1; The second be counterattack path---thunder and lightning hits lightning conducter or shaft tower, part lightning current flows into the earth along tower body, the flashover electric arc of another part lightning current from shaft tower along insulator surface flows to high-voltage conducting wires, referring to accompanying drawing 2.
In the main research work of measurement lightning information, concentrate on aspect three both at home and abroad at present:
The first, thunderbolt shaft tower, transmission line of electricity induction lightening are compressed into row numerical evaluation, study rational computing method; The second, on the analog line of test base, carry out lightning test research; The 3rd, large-scale promotion application lightning location system, has obtained the basic lightening activity parameter such as each department thunderstorm days, thunderbolt number of times, amplitude of lightning current distribution probability.The Main Means that obtains at present true lightening activity information is lightning location system.This system is utilized the size of a plurality of antenna remote measurement thunderbolt orientation and lightning current, for the lightning Protection Design of transmission line of electricity has accumulated raw data.But lightning location system is arranged on the sparse research station that distributes, away from lightning strike spot, measuring accuracy is limited, and Southern Mountain Areas of China measuring error reaches kilometer level, and location extreme difference, more can not distinguish counterattack and shielding.The device abroad having, utilizes the polarity of current sensor measurement lightning flash over electric current, and supposes that thunderbolt event is only produced by negative charge thundercloud, thereby distinguishes counterattack and shielding according to the polarity of current sensor output signal.But having an appointment in fact thunderbolt event 10% is produced by positive charge thundercloud, with above-mentioned, be assumed to be the data that basis obtains and still have unacceptable error.
On actual transmission line of electricity, surveying the method in lightning flash over path, there is the thunderbolt discriminating gear simultaneously using about voltage sensor and current sensor in Related domestic documents.After deliberation, it is not enough that really there are some designs in this technical equipment and device:
(1), to shielding situation, shielding current path comprises wire, dodges and iron insulator, shaft tower body and tower grounding net.Because voltage sensor capacitor charging needs the regular hour, can not come analytical voltage, current phase relation by lightning wave process, must use lumped-parameter circuit analysis.Therefore, must consider if the lumped-parameter elements such as shaft tower inductance, stake resistance, voltage sensor tank capacitance and resistance are to electric current voltage waveform phase shift impact.Voltage, current and phase difference and shaft tower inductance value, shaft tower earth mat resistance value are relevant, cause each shaft tower voltage, current and phase difference all different.Therefore, it is only the situation of 0 degree (homophase) or 180 degree (anti-phase) that the relation between electric current, voltage sensor output signal does not exist voltage, the current and phase difference of description that domestic literature is reported, but complicated vector relations.
(2) because measuring voltage capacitor plate two ends exist electric capacity with insulator hardware, shaft tower and cross-arm respectively, be equivalent to measuring voltage loop and have three capacitances in series, because rainfall is often followed in thunderbolt, under rainwater condition, the electric conductivity of air dielectric increases, measuring voltage capacitor plate significantly reduces with the bleeder resistance (in parallel) of the electric capacity of gold utensil, shaft tower, and equivalent charging rate increases considerably.When be struck by lightning shaft tower or shielding cause insulation sudden strain of a muscle to be ironed, due to tower grounding, lightning wave can produce negative reflection at shaft tower place, thunderbolt causes that the time of shaft tower potential rise is far smaller than the voltage sensor charging rate under rainy day condition, make not output of voltage sensor, therefore cannot collect voltage signal.
(3) for obtaining lightning current parameter, successively occurred that magnetic link method, magnetic tape type and rogowski coil add the mainstream technologys such as optical fiber, for a long time, the acquisition of thunder and lightning basic data has been played to good effect.Yet from relay protection angle, counterattack and shielding recognition methods based on circuit lightning stroke flashover character there is not yet report.
To these two kinds of flashovers of different nature, need to adopt the different design precautionary measures.For example: for shielding, according to rules design, should improve lightning conducter position and reduce shielding angle; For counterattack, should reduce pole tower ground resistance, or increase insulator, improve lightning withstand level.Due to lightning parameter is grasped not, actual effect and designing requirement have certain gap.Especially after flashover generation, counterattack or shielding are differentiated not clear, are difficult to take measures targetedly, and design defect has no way of investigating.Therefore, be badly in need of a kind of method of reliable differentiation shielding and counterattack, to obtain lightning information accurately, instruct the precautionary measures, improve Transmission Line Design.
(4) lightning impulse acts on transmission line of electricity, according to superpotential forming process, can be divided into induction thunder and the large class of direct lightning strike two.Because induction thunder does not directly act on circuit, for the high 110kV of dielectric level and Above Transmission Lines, not it is generally acknowledged and can cause the flashover that insulated.Direct lightning strike is to cause the insulated major reason of flashover of extra high voltage line, and the thunder and lightning causing for direct lightning strike disturbs and the accurate identification of lightning fault, current domestic effective report and the document of having no.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned defect, and a kind of AC and DC transmission line thunderbolt and counterattack recognition device are provided, and it is not only simple in structure, and accuracy is high, makes to differentiate shielding and counterattack and has stability, reliability, science.
Problem to be solved in the utility model is achieved by the following technical solution.
A kind of AC and DC transmission line thunderbolt and counterattack recognition device, the utility model is characterised in that, this device is comprised of lighting current sensor, lighting current sensor, lighting current sensor, traveling wave fault analysis and range finder module, GPS synchronous clock, data transmission module; Traveling wave fault analysis is connected respectively lighting current sensor A, lighting current sensor B, lighting current sensor C with range finder module; Traveling wave fault analysis is also connected with GPS synchronous clock with range finder module and data transmission module is sequentially connected.
Three lighting current sensors are arranged on respectively insulator boom gold utensil top end, cross arm of tower tail end place, shaft tower mobile jib, apart from cross arm of tower and middle, level ground.
The utlity model has following beneficial effect:
(1) the utility model has solved extra high voltage direct current transmission line thunderbolt shielding and counterattack identification problem, and thunderbolt, counterattack fault are distinguished, and supports, for the operation and maintenance of circuit provides reference for line thunder protection provides significant data.
(2) creatively utilize the polarity of three lighting current sensor output signals to judge lightning stroke flashover path, having solved the voltage acquisition that current voltage sensor exists needs the duration of charging, causes existing between the electric current that gathers and voltage the defect of complicated vector relations.Because collection capacity is electric current, between them, meet the divided relation of wave impedance, between two electric currents that make to gather, only there are homophase and inverse relationship, eliminated the impact that shaft tower inductance, shaft tower resistance, voltage sensor charging rate are moved electric current, voltage-phase, made to differentiate shielding and counterattack and there is stability, reliability, science.
(3) the utility model has saved a plurality of voltage sensors, has only used three lighting current sensors, has lower cost advantage, is more conducive to product spread.
(4) all adopt lighting current sensor, there is the duration of charging in the electric capacity of having eliminated as voltage sensor, atmospheric humidity changes can affect voltage sample loop charging rate, causes, to the insecure drawback of voltage sample, making the utlity model has " round-the-clock " operating mode.
(5) the utility model provides the device of differentiating thunderbolt, counterattack, has low cost, high reliability advantage.
(6) the utility model can collect the shaft tower earth current parameter of flowing through, the parameter of total lightning current in the time of therefore can measuring counterattack.
(7) while being struck by lightning tower top or lightning conducter, lightning current flows into the earth along shaft tower and lightning conducter, and the wave impedance of shaft tower, lightning conducter and the existence of stake resistance, will rise sharply the transient state current potential (absolute value) of masthead, when the two ends pressure reduction that insulated surpasses its withstand voltage, there is flashover, cause counterattack; Lightning current is walked around lightning conducter and is directly hit wire, makes it to form lightning surge, and this process is called shielding, when the two ends pressure reduction that insulated surpasses its withstand voltage, also flashover will occur.The method of the counterattack trip-out rate that reducing is struck by lightning causes mainly contains: reduce pole tower ground resistance; Install coupling ground wire additional; Improve line insulation intensity.The main method that reduces shielding flashover rate is to reduce shielding angle or adopt negative shielding angle: correctly distinguish shielding and counterattack and can be line thunder protection basic data support is provided.
Accompanying drawing explanation
Fig. 1 is overhead transmission line generation shielding schematic diagram;
Fig. 2 is that counterattack schematic diagram occurs overhead transmission line;
Fig. 3 is structural representation of the present utility model;
Fig. 4 is scheme of installation of the present utility model;
Fig. 5 is the utility model DC power transmission line networking schematic diagram;
Fig. 6 is the utility model transmission line of alternation current networking schematic diagram;
Fig. 7 is traveling wave fault analysis described in the utility model and range finder module principle of operation figure.
Embodiment
Below in conjunction with accompanying drawing, content of the present utility model is described in further detail.
AC and DC transmission line thunderbolt and a counterattack recognition device, the utility model device is comprised of lighting current sensor A1, lighting current sensor B2, lighting current sensor C3, traveling wave fault analysis and range finder module 4, GPS synchronous clock 5, data transmission module 6; Traveling wave fault analysis is connected respectively lighting current sensor A1, lighting current sensor B2, lighting current sensor C3 with range finder module 4; Traveling wave fault analysis is sequentially connected with GPS synchronous clock 5 and data transmission module 6 with range finder module 4.
Described lighting current sensor A1 is arranged on insulator boom gold utensil top end P, and lighting current sensor B2 is arranged on the cross arm of tower tail end L of place, and lighting current sensor C3 installs shaft tower mobile jib, apart from cross arm of tower and middle, level ground M.
As shown in Figure 3, a kind of AC and DC transmission line thunderbolt of the utility model and counterattack recognition device, be comprised of lighting current sensor A1, lighting current sensor B2, lighting current sensor C3, traveling wave fault analysis and range finder module 4, GPS synchronous clock 5, data transmission module 6.Wherein, lighting current sensor A1, lighting current sensor B2, lighting current sensor C3 are connected with range finder module 4 with traveling wave fault analysis simultaneously, traveling wave fault analysis is connected with GPS synchronous clock 5 with range finder module 4, and GPS synchronous clock 5 is connected with data transmission module 6.
As shown in Figure 4, described lighting current sensor A1 is arranged on insulator boom gold utensil top end P, and lighting current sensor B2 is arranged on the cross arm of tower tail end L of place, and lighting current sensor C3 installs shaft tower mobile jib, apart from cross arm of tower and middle, level ground M; Traveling wave fault analysis is connected respectively lighting current sensor A1, lighting current sensor B2, lighting current sensor C3 with range finder module 4; Traveling wave fault analysis is connected with GPS synchronous clock 5 with range finder module 4, and GPS synchronous clock 5 is connected with data transmission module 6.
In conjunction with Fig. 5 and Fig. 6, when there is thunderbolt event, the identification of thunderbolt, counterattack accident can be by being arranged on insulator boom gold utensil top end P, the cross arm of tower tail end L of place and installation shaft tower mobile jib, identifying apart from the lighting current sensor of cross arm of tower and middle, level ground M, can measure lightning current parameter (amplitude of lightning current, steepness), and analyze and to compare and measure result and differentiate.Differentiation result is uploaded to range finding main website and scheduling station by data transmission module 6, helps rapid looking up the fault point, carry out fault defect elimination.GPS synchronous clock 5 for accurately to time, the data markers that guarantees to be uploaded to range finding main website and scheduling station is accurate.
The purpose of this utility model is to provide a kind of transmission line lightning stroke flashover path pick-up unit, can be by three lighting current sensor signal distinguishing lightning flash over path shieldings or counterattack; Thunder and lightning charge polarity plus or minus; And lightning current peak value size and steepness.
Concrete basis for estimation is as shown in table 1:
This situation is summarized as follows table:
Three lighting current sensor output signals of table 1 and thunderbolt type of relationship table
As shown in Figure 7, traveling wave fault analysis and range finder module principle of operation, the corresponding a pair of positive and negative modulus maximum replacing of surge, is accurately to obtain surge polarity, and modulus maximum and the polarity of original zero mode voltage are carried out to result after same exclusive disjunction as surge extraction logic.Each surge through small echo change, delivery maximum value is got symbolic operation, with exclusive disjunction and multiply each other, draw the shielding of lightning flash over path or counterattack; Thunder and lightning charge polarity plus or minus; And lightning current peak value size.
Because lighting current sensor is without capacitor charging problem, so current signal collection and air humidity are irrelevant, are not subject to weather effect; And the electric current of the lighting current sensor of flowing through is wave process, be not subject to the impact of the lumped-parameter elements such as shaft tower reactance, stake resistance, current distributing is affected by each branch road wave impedance only, needn't use lumped-parameter circuit analysis, therefore tested current phase can not change, and measurement result is reliable and stable.
Claims (2)
1. an AC and DC transmission line thunderbolt and counterattack recognition device, it is characterized in that, this installs by lighting current sensor A(1), lighting current sensor B(2), lighting current sensor C(3), traveling wave fault analysis and range finder module (4), GPS synchronous clock (5), data transmission module (6) form; Traveling wave fault analysis is connected respectively three lighting current sensors with range finder module (4); Traveling wave fault analysis is also sequentially connected with GPS synchronous clock (5) and data transmission module (6) with range finder module (4).
A kind of AC and DC transmission line thunderbolt according to claim 1 with counterattack recognition device, it is characterized in that, described lighting current sensor A(1) be arranged on insulator boom gold utensil top end P, lighting current sensor B(2) be arranged on the cross arm of tower tail end L of place, lighting current sensor C(3) shaft tower mobile jib is installed, apart from cross arm of tower and middle, level ground M.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420160636.8U CN203838288U (en) | 2014-04-03 | 2014-04-03 | Lightning stroke shielding failure and back flashover identification apparatus for AC/DC power transmission line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420160636.8U CN203838288U (en) | 2014-04-03 | 2014-04-03 | Lightning stroke shielding failure and back flashover identification apparatus for AC/DC power transmission line |
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| CN203838288U true CN203838288U (en) | 2014-09-17 |
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| CN201420160636.8U Expired - Lifetime CN203838288U (en) | 2014-04-03 | 2014-04-03 | Lightning stroke shielding failure and back flashover identification apparatus for AC/DC power transmission line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730422A (en) * | 2015-03-31 | 2015-06-24 | 河南行知专利服务有限公司 | Power distribution network single-phase earth fault positioning device and method |
| CN108169628A (en) * | 2018-02-10 | 2018-06-15 | 新乡市中宝电气有限公司 | Identification lightning fault property and the device and method for being accurately positioned trouble point |
| CN111239545A (en) * | 2020-02-06 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Lightning overvoltage fault positioning method |
-
2014
- 2014-04-03 CN CN201420160636.8U patent/CN203838288U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730422A (en) * | 2015-03-31 | 2015-06-24 | 河南行知专利服务有限公司 | Power distribution network single-phase earth fault positioning device and method |
| CN108169628A (en) * | 2018-02-10 | 2018-06-15 | 新乡市中宝电气有限公司 | Identification lightning fault property and the device and method for being accurately positioned trouble point |
| CN111239545A (en) * | 2020-02-06 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Lightning overvoltage fault positioning method |
| CN111239545B (en) * | 2020-02-06 | 2022-08-09 | 云南电网有限责任公司电力科学研究院 | Lightning overvoltage fault positioning method |
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