CN107316129A - Transmission line of electricity natural calamity flashover risk integrative assessment method - Google Patents
Transmission line of electricity natural calamity flashover risk integrative assessment method Download PDFInfo
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- CN107316129A CN107316129A CN201710413321.8A CN201710413321A CN107316129A CN 107316129 A CN107316129 A CN 107316129A CN 201710413321 A CN201710413321 A CN 201710413321A CN 107316129 A CN107316129 A CN 107316129A
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a kind of transmission line of electricity natural calamity flashover risk integrative assessment method, this method is based on traditional transmission line lightning stroke, ice sudden strain of a muscle, pollution flashover and windage yaw discharge scale-model investigation, calculate the probability of flashover of the transmission line of electricity under the conditions of current natural calamity, determine the load loss after line flashover failure, grade classification finally is carried out using the ratio of load loss and power network power load as value-at-risk, so as to realize the comprehensive assessment to transmission line of electricity different type natural calamity flashover risk.The present invention provides a unified, quantitative reference frame for the work of preventing and reducing natural disasters of transmission line of electricity different type natural calamity.
Description
Technical field
Prevented and reduced natural disasters field the invention belongs to power network, and in particular to a kind of transmission line of electricity natural calamity flashover risk integrative is commented
Estimate method.
Background technology
The transmission line of electricity of outdoor operation is chronically exposed in atmospheric environment, it is easy to by being struck by lightning, icing, filth, strong wind
Etc. the influence of natural calamity, trip risk is than more prominent.At present, for transmission line of electricity flashover risk under different Effect of Natural Disaster
Assessment, domestic and foreign scholars have carried out substantial amounts of research work.
In terms of lightning stroke flashover assessment, analyze defeated frequently with regular method, electric geometry method or lightning leader progressions model
Electric line Characteristic of Lightning Shielding Failure；Ice dodge assessment in terms of, calculate icing increase thickness main method have Goodwin models,
Imai models and Makkonen models；In terms of pollution flashover assessment, the filthy sudden strain of a muscle of electric arc and remaining pollution layer resistant series is generally basede on
Network model calculates insulator contamination voltage；In terms of windage yaw discharge assessment, more ripe, simple method is the straight rod model of rigid body
Calculate minimum air void of the insulator chain apart from shaft tower.Based on the studies above achievement, computing electric power line is in common natural calamity
Probability of flashover under the conditions of evil, can provide foundation for the risk assessment work of circuit.
However, the risk assessment of current power transmission line flashover is generally directed to single natural calamity, and for different natural calamities
Harmful flashover risk, the evaluation index used is inconsistent.Such as carrying out transmission line lightning stroke, ice sudden strain of a muscle, pollution flashover and windage yaw discharge
In risk assessment processes, the research object of emphasis is respectively amplitude of lightning current, ice covering thickness, equivalent salt density, windage yaw gap etc., is gone back
The unified assessment models of neither one, it is adaptable to the assessment of transmission line of electricity flashover risk under the conditions of different natural calamities.Therefore, I
In the urgent need to a kind of new appraisal procedure for transmission line of electricity natural calamity flashover risk.
The content of the invention
The present invention is on the basis of traditional transmission line lightning stroke, ice sudden strain of a muscle, pollution flashover and windage yaw discharge scale-model investigation, according to certainly
Right disaster causes the load loss after line fault, it is proposed that a kind of transmission line of electricity natural calamity flashover risk integrative assessment side
Method, so that the work of preventing and reducing natural disasters for transmission line of electricity different type natural calamity provides a unified, quantitative reference frame.
The present invention is calculated and existed based on traditional transmission line lightning stroke, ice sudden strain of a muscle, pollution flashover and windage yaw discharge scale-model investigation
The probability of flashover of transmission line of electricity, determines the load loss after line flashover failure, finally by load under the conditions of current natural calamity
The ratio of loss and power network power load carries out grade classification as value-at-risk, so as to realize natural to transmission line of electricity different type
The comprehensive assessment of disaster flashover risk：Concretely comprise the following steps：
S1, judge whether current transmission line of electricity service condition can cause arcing fault；
S2, the probability of flashover calculated under correspondence fault type；
S3, determine the load loss after different natural calamity failures；
S4, the load loss assessment transmission line of electricity natural calamity flashover risk class determined according to S3.
Whether current transmission line of electricity service condition is judged in S1 can cause the method for arcing fault to be：
By when the amplitude of lightning current currently surveyed, ice covering thickness, equivalent salt density, windage yaw gap and insulator generation flashover pairs
The threshold limit value answered is compared, and is judged as occurring corresponding arcing fault if exceeding corresponding threshold limit value；Otherwise, it is defeated
The flashover risk for going out transmission line of electricity natural calamity is zero.
The step of corresponding to the probability of flashover under fault type is calculated in S2 is：
When lightning stroke flashover occurs for transmission line of electricity, hit according to critical away from rscCalculate maximum shielding dangerous currents ImaxFor
Such as measure amplitude of lightning current I<Imax, then the voltage difference U at insulator two ends be
In formula, Z0For the wave impedance of main discharge channel；ZdFor the equivalent value wave impedance of wire；
Compare the lightning impulse flashover voltage U of insulator 50%50%, calculating lightning stroke flashover probability f is
In formula, σ is the standard deviation of lightning stroke flashover voltage, and Φ is standardized normal distribution；
When ice, which occurs, for transmission line of electricity dodges, U50%Calculation formula be
In formula：KfFor the constant relevant with insulator pattern, material, air pressure, voltage type etc.；A, b are respectively that salt is close, ash
Close effect characteristicses index；ρESDD, ρNSDDThe respectively equivalent salt deposit density of insulator surface and the close value of ash, mg/cm2；P、P0Respectively
Air pressure and canonical reference atmospheric gas pressure for high altitude localities；mpFor effects of air pressure characteristic index；T is environment temperature, DEG C；ωtFor
Temperature Intrusion Index；M is covering ice for insulator weight, kg/ pieces；wmIt is the characteristic index for representing ice cover influence；
When pollution flashover occurs for transmission line of electricity, U50%Calculation formula be
When windage yaw discharge occurs for transmission line of electricity, minimum air void d calculation formula is
In formula：η is shaft tower tower body and cross-arm angle, degree；D is minimum air void, m；λ is that suspension insulator hanging point is arrived
Conductor spacing, m；DLFor wire diameter, m；For suspension insulator angle of wind deflection, degree；XAOriginated for insulator hitch point to shaft tower
The distance of point, m；XCFor shaft tower tower body and cross-arm intersection point to the distance of shaft tower starting point, m；
Clearance distance and the relation curve of breakdown voltage are inquired about, flashover voltage U when obtaining windage yaw gap for d50%；
Dodged according to ice, pollution flashover and windage yaw discharge voltage U50%Calculate the probability of flashover f of ice sudden strain of a muscle, pollution flashover and windage yaw discharge
For
In formula, UopFor the operation phase voltage of transmission line of electricity, σ is the standard deviation of lightning stroke flashover voltage, and Φ is standard normal
Distribution.
Load loss L calculation formula is in S3
L=S × F
Wherein, S subtracts for network load supplies size, and as natural calamity causes after transmission line of electricity arcing fault, to meet electricity
Net Static Security Constraints need to subtract the minimum value for load；The calculation formula that load subtracts for probability F is
F=f × r
In formula, f is the probability of flashover under different faults type；R is transmission line of electricity generation flashover jump under correspondence fault type
The unsuccessful rate of reclosing after lock.Transmission line of electricity for being fitted without reclosing device, r is 1.
The step of load loss that is determined in S4 according to S3 assesses transmission line of electricity natural calamity flashover risk class be：
By the load loss L of transmission line of electricity after natural calamity failure and the ratio L of power network power loadtotalIt is used as flashover wind
Danger value P, has
The method for determining flashover risk class according to flashover value-at-risk is：As P=0, risk class is nothing, degree of risk
To be free from risk；When 0<During P≤5%, risk class is I grade, and degree of risk is smaller risk；When 5%<During P≤10%, risk etc.
Level is II grades, and degree of risk is average risk；When 10%<During P≤20%, risk class is III grade, and degree of risk is relatively strong winds
Danger；As P ＞ 20%, risk class is IV grade, and degree of risk is material risk.
The beneficial effects of the present invention are：For power network under different type disaster operation risk give a unification,
Effective appraisal procedure, i.e., be that calculated load subtracts and subtracts confession size for probability and load determine can under each disaster failure
The load of the loss of energy, and contrasted with power network power load to divide flashover risk class, therefore risk evaluated etc.
Level can not only fully reflect influence degree of each disaster to operation of power networks state, and the assessment under different type disaster
As a result it can also each other be contrasted, embody the order of severity that different type disaster influences on operation of power networks state.The invention
Available for the online evaluation of transmission line of electricity natural hybridized orbit, without using different appraisal procedures for different type disaster, greatly
The big workload for reducing circuit operation maintenance personnel and work complexity, and assessment result have it is comparative, and can be to different type
The influence degree of operation of power networks state has one more intuitively to recognize under disaster.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the flow chart of transmission line of electricity natural calamity flashover risk integrative assessment method；
Fig. 2 is the model schematic in computing electric power line windage yaw gap.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
As shown in figure 1, in one particular embodiment of the present invention, being realized according to the meteorological data at electric power line pole tower
Insulator dirty degree is assessed, and specifically includes following steps：
S1, judge whether current transmission line of electricity service condition can cause arcing fault；
By when the amplitude of lightning current currently surveyed, ice covering thickness, equivalent salt density, windage yaw gap and insulator generation flashover pairs
The threshold limit value answered is compared, and is judged as occurring corresponding arcing fault if exceeding corresponding threshold limit value；Otherwise, it is defeated
The flashover risk for going out transmission line of electricity natural calamity is zero.Such as：When the amplitude of lightning current of actual measurement exceedes amplitude of lightning current Threshold extent
Value is then judged as occurring lightning stroke flashover failure, when ice covering thickness more than ice covering thickness threshold limit value is then judged as occurring ice sudden strain of a muscle
Failure, when equivalent salt density more than equivalent salt density threshold limit value is then judged as occurring pollution flashover failure, when windage yaw gap exceedes windage yaw
Gap threshold limit value is then judged as occurring windage yaw discharge failure；
S2, the probability of flashover calculated under correspondence fault type；
When lightning stroke flashover occurs for transmission line of electricity, hit according to critical away from rscCalculate maximum shielding dangerous currents ImaxFor
Such as measure amplitude of lightning current I<Imax, then the voltage difference U at insulator two ends be
In formula, Z0For the wave impedance of main discharge channel；ZdFor the equivalent value wave impedance of wire；
Compare the lightning impulse flashover voltage U of insulator 50%50%, calculating lightning stroke flashover probability f is
In formula, σ is the standard deviation of lightning stroke flashover voltage, and Φ is standardized normal distribution；
When ice, which occurs, for transmission line of electricity dodges, U50%Calculation formula be
In formula：KfFor the constant relevant with insulator pattern, material, air pressure, voltage type etc.；A, b are respectively that salt is close, ash
Close effect characteristicses index；ρESDD, ρNSDDThe respectively equivalent salt deposit density of insulator surface and the close value of ash, mg/cm2；P、P0Respectively
Air pressure and canonical reference atmospheric gas pressure for high altitude localities；mpFor effects of air pressure characteristic index；T is environment temperature, DEG C；ωtFor
Temperature Intrusion Index；M is covering ice for insulator weight, kg/ pieces；wmIt is the characteristic index for representing ice cover influence；
When pollution flashover occurs for transmission line of electricity, U50%Calculation formula be
Referring to Fig. 2, when windage yaw discharge occurs for transmission line of electricity, minimum air void d calculation formula is
In formula：η is shaft tower tower body and cross-arm angle, degree；D is minimum air void, m；λ is that suspension insulator hanging point is arrived
Conductor spacing, m；DLFor wire diameter, m；For suspension insulator angle of wind deflection, degree；XABar is arrived for insulator hitch point (A points)
The distance of tower starting point (O points), m；XCThe distance of shaft tower starting point (O points), m are arrived for the intersection point (C points) of shaft tower tower body and cross-arm；
Clearance distance and the relation curve of breakdown voltage are inquired about, flashover voltage U when obtaining windage yaw gap for d50%；
Dodged according to ice, pollution flashover and windage yaw discharge voltage U50%Calculate the probability of flashover f of ice sudden strain of a muscle, pollution flashover and windage yaw discharge
For
In formula, UopFor the operation phase voltage of transmission line of electricity, σ is the standard deviation of lightning stroke flashover voltage, and Φ is standard normal
Distribution；
S3, determine the load loss after different natural calamity failures；
Load loss L calculation formula is
L=S × F
Wherein, S subtracts for network load supplies size, and as natural calamity causes after transmission line of electricity arcing fault, to meet electricity
Net Static Security Constraints need to subtract the minimum value for load；F is that load subtracts and supplies probability, the transmission of electricity for being mounted with reclosing device
Circuit, it is line flashover probability and the product of the unsuccessful rate of reclosing that load, which subtracts for probability,；For being fitted without reclosing device
Transmission line of electricity, load subtract for probability be line flashover probability；
S4, the load loss assessment transmission line of electricity natural calamity flashover risk class determined according to S3；
By the load loss L of transmission line of electricity after natural calamity failure and the ratio L of power network power loadtotalIt is used as flashover wind
Danger value P, has
The method of the flashover risk class determined according to flashover value-at-risk is that, as P=0, risk class is nothing, risk journey
Spend to be free from risk；When 0<During P≤5%, risk class is I grade, and degree of risk is smaller risk；When 5%<During P≤10%, risk
Grade is II grades, and degree of risk is average risk；When 10%<During P≤20%, risk class is III grade, and degree of risk is larger
Risk；As P ＞ 20%, risk class is IV grade, and degree of risk is material risk.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (6)
1. a kind of transmission line of electricity natural calamity flashover risk integrative assessment method, it is characterised in that comprise the following steps：
S1, judge whether current transmission line of electricity service condition can cause arcing fault；
S2, the probability of flashover calculated under correspondence fault type；
S3, determine the load loss after different natural calamity failures；
S4, the load loss assessment transmission line of electricity natural calamity flashover risk class determined according to S3.
2. transmission line of electricity natural calamity flashover risk integrative assessment method according to claim 1, it is characterised in that：In S1
Whether judge current transmission line of electricity service condition can cause the method for arcing fault to be：
It is corresponding during by the amplitude of lightning current currently surveyed, ice covering thickness, equivalent salt density, windage yaw gap with insulator generation flashover
Threshold limit value is compared, and is judged as occurring corresponding arcing fault if exceeding corresponding threshold limit value；Otherwise, export defeated
The flashover risk of electric line natural calamity is zero.
3. transmission line of electricity natural calamity flashover risk integrative assessment method according to claim 1, it is characterised in that：In S2
Calculating the step of corresponding to the probability of flashover under fault type is：
When lightning stroke flashover occurs for transmission line of electricity, hit according to critical away from rscCalculate maximum shielding dangerous currents ImaxFor
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Compare the lightning impulse flashover voltage U of insulator 50%50%, calculating probability of flashover f is
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In formula, σ is the standard deviation of lightning stroke flashover voltage, and Φ is standardized normal distribution；
When ice, which occurs, for transmission line of electricity dodges, U50%Calculation formula be
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In formula：KfFor the constant relevant with insulator pattern, material, air pressure, voltage type etc.；A, b are respectively that salt is close, grey close shadow
Ring characteristic index；ρESDD、ρNSDDThe respectively equivalent salt deposit density of insulator surface and the close value of ash, mg/cm2；P、P0It is respectively high
The air pressure and canonical reference atmospheric gas pressure of Altitude Regions；mpFor effects of air pressure characteristic index；T is environment temperature, DEG C；ωtFor temperature
Intrusion Index；M is covering ice for insulator weight, kg/ pieces；wmIt is the characteristic index for representing ice cover influence；
When pollution flashover occurs for transmission line of electricity, U50%Calculation formula be
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When windage yaw discharge occurs for transmission line of electricity, minimum air void d calculation formula is
In formula：η is shaft tower tower body and cross-arm angle, degree；D is minimum air void, m；λ is suspension insulator hanging point to wire
Distance, m；DLFor wire diameter, m；For suspension insulator angle of wind deflection, degree；XAFor insulator hitch point to shaft tower starting point
Distance, m；XCFor shaft tower tower body and cross-arm intersection point to the distance of shaft tower starting point, m；
Clearance distance and the relation curve of breakdown voltage are inquired about, flashover voltage U when obtaining windage yaw gap for d50%；Dodged according to ice,
Pollution flashover and windage yaw discharge voltage U50%Calculate that ice dodges, the probability of flashover f of pollution flashover and windage yaw discharge is
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In formula, UopFor the operation phase voltage of transmission line of electricity, σ is the standard deviation of lightning stroke flashover voltage, and Φ is standardized normal distribution.
4. transmission line of electricity natural calamity flashover risk integrative assessment method according to claim 1, it is characterised in that：In S3
Load loss L calculation formula is
L=S × F
Wherein, S is that network load subtracts and supplies size, and F is that load subtracts and supplies probability.
5. transmission line of electricity natural calamity flashover risk integrative assessment method according to claim 4, it is characterised in that：Load
The calculation formula subtracted for probability F is
F=f × r
In formula, f is the probability of flashover under different faults type；R occurs after flashover tripping operation for transmission line of electricity under correspondence fault type
The unsuccessful rate of reclosing；Transmission line of electricity for being fitted without reclosing device, r is 1.
6. transmission line of electricity natural calamity flashover risk integrative assessment method according to claim 1, it is characterised in that：In S4
The step of load loss that is determined according to S3 assesses transmission line of electricity natural calamity flashover risk class be：
By the load loss L of transmission line of electricity after natural calamity failure and the ratio L of power network power loadtotalIt is used as flashover value-at-risk
P, has
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The method for determining flashover risk class according to flashover value-at-risk is：As P=0, risk class is nothing, and degree of risk is zero
Risk；When 0<During P≤5%, risk class is I grade, and degree of risk is smaller risk；When 5%<During P≤10%, risk class is
II grades, degree of risk is average risk；When 10%<During P≤20%, risk class is III grade, and degree of risk is greater risk；When
During P ＞ 20%, risk class is IV grade, and degree of risk is material risk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710413321.8A CN107316129B (en) | 2017-06-05 | 2017-06-05 | Comprehensive assessment method for natural disaster flashover risk of power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710413321.8A CN107316129B (en) | 2017-06-05 | 2017-06-05 | Comprehensive assessment method for natural disaster flashover risk of power transmission line |
Publications (2)
| Publication Number | Publication Date |
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| CN107316129A true CN107316129A (en) | 2017-11-03 |
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| CN109116195A (en) * | 2018-06-27 | 2019-01-01 | 中国南方电网有限责任公司超高压输电公司大理局 | The calculation method and device of 50% flashover voltage of hot line maintenance combinational gap |
| CN110189012A (en) * | 2019-05-23 | 2019-08-30 | 国电南瑞科技股份有限公司 | The dense transmission channel automatic identifying method and system of adaptive natural hazards risk |
| CN110189011A (en) * | 2019-05-23 | 2019-08-30 | 国电南瑞科技股份有限公司 | Dense transmission channel assessment of failure method and system under natural calamity |
| CN111738617A (en) * | 2020-07-01 | 2020-10-02 | 广东电网有限责任公司广州供电局 | Transformer substation risk assessment method and early warning system in heavy rainfall weather |
| CN112257028A (en) * | 2020-10-16 | 2021-01-22 | 广东电网有限责任公司 | Windage yaw flashover fault probability calculation method and device of power transmission line |
| CN113343399A (en) * | 2021-06-11 | 2021-09-03 | 华北电力大学（保定） | Method for calculating gap between ground wire and ground wire |
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| CN109116195A (en) * | 2018-06-27 | 2019-01-01 | 中国南方电网有限责任公司超高压输电公司大理局 | The calculation method and device of 50% flashover voltage of hot line maintenance combinational gap |
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| CN113343399A (en) * | 2021-06-11 | 2021-09-03 | 华北电力大学（保定） | Method for calculating gap between ground wire and ground wire |
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