CN108414897B - A kind of helicopter livewire work combination the air gap discharge voltage prediction technique - Google Patents
A kind of helicopter livewire work combination the air gap discharge voltage prediction technique Download PDFInfo
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Abstract
The present invention relates to hot line maintenance technologies, the air gap discharge voltage prediction technique is combined more particularly to a kind of helicopter livewire work, the air gap between high-voltage conducting wires and suspended conductor is defined as the first gap, the air gap between suspension helicopter and grounding body is defined as the second gap.Once calculate and extract Field signature collection by electrostatic field, input support vector classification carries out discharge voltage and once predicts, determines which gap first punctures and its discharge voltage value；Electrostatic field secondary calculating is carried out according to the potential change situation after breakdown and Field signature extracts, and discharge voltage re prediction is carried out using support vector classification, the discharge voltage value of discharging gap after determining；The discharge voltage value in two gaps of electric discharge more one after another takes the greater as the discharge voltage predicted value of helicopter livewire work combination the air gap.This method can substitute discharge test, save experimentation cost, can provide guidance to obtain the minimum safe distance of helicopter livewire work.
Description
Technical field
The invention belongs to hot line maintenance technical fields more particularly to a kind of helicopter livewire work to combine air
Gap discharge voltage-prediction method.
Background technique
Livewire work is transmission line faultlocating, maintenance and the important means of transformation, and helicopter livewire work can reduce operation
The physical demands of personnel improves operating efficiency, it has also become the important measures of ultra-high/extra-high voltage transmission line of electricity operation and maintenance.Currently, I
State's UHV Transmission Engineering puts into operation extensively, has carried out livewire work and repair and maintenance to UHV transmission line using helicopter
The technological means important as one.
Platform operations method is currently widely used helicopter livewire work method, usually in the ventral position of helicopter
Installment work platform, operating personnel, which rides on platform, directly to be contacted live wire and carries out equipotential live line work.When development platform
When method helicopter livewire work, during entering equipotential, helicopter and operating personnel are in band as floating potentical body
In electric field between electric lead and grounding body, the combination the air gap between high-voltage conducting wires-helicopter-grounding body is formed.In order to
Guarantee operation safety, need to study should keep most between helicopter and live wire, grounding body during helicopter livewire work
The configuration of combinational gap corresponding to small safety clearance distance namely minimum discharge voltage.
Currently, main both at home and abroad carry out combinational gap discharge test by simulation typical operation operating condition, livewire work is obtained
Minimum safe clearance distance.Since experimental study has that cost is high, period length, some scholars have carried out livewire work
The research of the air gap discharge mechanism is combined, and proposes some discharge voltage calculation methods, these methods are mostly in Rizk mould
Type (" Effect of floating conducting objects on critical switching impulse
Breakdown of air insulation ", IEEE Transactions on Power Delivery, nineteen ninety-five volume 10
3rd phase) on the basis of be suitably modified it is obtained, due to Rizk model be to typical gap carry out test and based on electric discharge
Mechanism and some simplified obtained semiempirical models of hypothesis, for different electrode structure and gap arrangement, different work operating condition
Under combinational gap discharge voltage calculate, the applicability of Rizk model is limited, is unable to satisfy practical engineering application, it is difficult to realize straight
The discharge voltage for rising machine livewire work combination the air gap calculates.
Therefore, carry out combination the air gap discharge voltage forecasting research and propose a kind of effective discharge voltage prediction
Method can provide theoretical foundation for the minimum safe distance for determining helicopter livewire work and combinational gap configuration, help simultaneously
In reducing test work load and testing expenses, for instructing helicopter livewire work to be applied to the fortune of ultra-high/extra-high voltage transmission line of electricity
Dimension maintenance has important engineering significance.
Summary of the invention
Simulation test is substituted by simulation calculation the object of the present invention is to provide a kind of, obtains the height under different gap configuration
Conducting wire-helicopter-grounding body combination the air gap discharge voltage is pressed, to obtain the minimum safe distance of helicopter livewire work
From method.
To achieve the above object, the technical solution adopted by the present invention is that: the air gap is combined in a kind of helicopter livewire work
Discharge voltage prediction technique, comprising the following steps:
The air gap between high-voltage conducting wires and suspension helicopter and operating personnel is defined as the first gap by step 1, will
The air gap between suspension helicopter and operating personnel and grounding body is defined as the second gap；
Step 2 is once calculated and discharge voltage is once predicted by electrostatic field, determines the gap first punctured and its electric discharge electricity
Pressure value；
Step 3 passes through electrostatic field secondary calculating and discharge voltage re prediction, the discharge voltage of discharging gap after determining
Value；
Step 4, the discharge voltage value in two gaps of discharging one after another by comparing, it is empty to obtain helicopter livewire work combination
The whole discharge voltage predicted value in gas gap.
In above-mentioned helicopter livewire work combination the air gap discharge voltage prediction technique, the specific reality of prediction technique
It is existing the following steps are included:
Step 2.1 establishes combination the air gap three-dimensional finite element simulation model under helicopter livewire work operating condition, to height
It presses conducting wire to apply high potential, zero potential is applied to grounding body and truncation air boundary, suspension helicopter and operating personnel are carried out
Current potential Degree-of-freedom Coupling carries out electrostatic field and once calculates；
Step 2.2, according to calculated result of electrostatic field, define respectively the first gap and the second gap discharge channel and
Shortest path extracts the Field signature collection of the first gap and the second gap discharge channel and shortest path, joins as input
Amount, respectively once predicts the discharge voltage value in the first gap and the second gap using support vector classification model；If
The discharge voltage predicted value in the first gap is less than the discharge voltage predicted value in the second gap, then the first gap is first breakdown, carries out
Step 2.3；If the discharge voltage predicted value in the first gap is greater than the discharge voltage predicted value in the second gap, the second gap elder generation quilt
Breakdown, enters step 2.4；
After step 2.3, the first gap breakdown, suspension helicopter and operating personnel and high-voltage conducting wires equipotential, according to first
Potential change after gap breakdown applies high potential to helicopter and livewire work personnel, carries out electrostatic field secondary calculating, extracts
The Field signature collection in the second gap and as input parameter, electric discharge using support vector classification model to the second gap
Voltage carries out re prediction；Second gap in the discharge voltage predicted value and secondary calculating in the first gap in relatively more primary calculating
Discharge voltage predicted value takes the greater to combine the air gap discharge voltage predicted value as helicopter livewire work；
After step 2.4, the second gap breakdown, helicopter and livewire work personnel and grounding body equipotential, after breakdown
Potential change zero potential is applied to helicopter and livewire work personnel, carry out electrostatic field secondary calculating, extract the first gap
Field signature collection and as input parameter, carries out two to the discharge voltage in the first gap using support vector classification model
Secondary prediction, relatively once the discharge voltage in the first gap is pre- in the discharge voltage predicted value and secondary calculating in the second gap in calculating
Measured value takes the greater to combine the air gap discharge voltage predicted value as helicopter livewire work.
In above-mentioned helicopter livewire work combination the air gap discharge voltage prediction technique, high-voltage conducting wires use high pressure
Bundle conductor configuration, grounding body use solid conductor.
In above-mentioned helicopter livewire work combination the air gap discharge voltage prediction technique, the electric discharge in the first gap is logical
Area of space between Dow Jones index operating personnel and high-voltage conducting wires, the shortest path in the first gap refer to operating personnel with it is nearest away from it
Straight line path between high pressure split conductor sub-conductor；The discharge channel in the second gap refers to Helicopter Main rotor end and grounding body
Between area of space, the shortest path in the second gap refers to Helicopter Main rotor end to the straight line path of grounding body minimum distance
Diameter.
In above-mentioned helicopter livewire work combination the air gap discharge voltage prediction technique, Field signature collection includes electricity
Field intensity, electric-force gradient, electric field energy, electric field unevenness.
In above-mentioned helicopter livewire work combination the air gap discharge voltage prediction technique, support vector classification mould
Type needs the design feature according to the first gap and the second gap, selects typical electrode gap or engineering interstitial structure as training
Sample set is trained to obtain to it.
In above-mentioned helicopter livewire work combination the air gap discharge voltage prediction technique, prediction technique is suitable for
500kV and above transmission line of electricity platform method helicopter livewire work combination the air gap are under different gap configuration
Discharge voltage prediction.
The beneficial effects of the present invention are: 1, combined with machine learning algorithm using numerical computation method, it is pre- by intelligence
Measure helicopter livewire work combination the air gap discharge voltage, manpower and material resources needed for substantially saving experimental study at
This, can provide theoretical direction to obtain the minimum safe distance of helicopter livewire work.
2, compared to the existing combinational gap discharge voltage calculation method such as Rizk model, prediction technique provided by the invention
The air gap is combined in helicopter livewire work suitable for interstitial structure complexity, be can be applied to different gap under actual condition and is matched
The discharge voltage prediction set.
Detailed description of the invention
Fig. 1 is that the air gap discharge voltage prediction technique process is combined in the helicopter livewire work of one embodiment of the invention
Figure；
Fig. 2 is the platform method helicopter livewire work simulation test arrangement schematic diagram of one embodiment of the invention；
Fig. 3 is that the air gap three-dimensional finite element model is combined in the platform method helicopter livewire work of one embodiment of the invention
Schematic diagram；
Fig. 4 is that calculated result of the air gap electrostatic field is combined in the helicopter livewire work of one embodiment of the invention
Figure；
Fig. 5 is that the helicopter livewire work combination the air gap discharge channel of one embodiment of the invention shows with shortest path
It is intended to；
Fig. 6 is primary for the first gap of helicopter livewire work of one embodiment of the invention and the discharge voltage in the second gap
Prediction result figure；
Fig. 7 is that the air gap electrostatic field secondary calculating result is combined in the helicopter livewire work of one embodiment of the invention
Figure；
Fig. 8 is that the helicopter livewire work combination the air gap discharge voltage of one embodiment of the invention is once predicted and two
Secondary prediction result comparison diagram；
Fig. 9 is that the air gap discharge voltage predicted value and test are combined in the helicopter livewire work of one embodiment of the invention
It is worth comparison diagram.
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
The present embodiment adopts the following technical scheme that realize, the air gap discharge voltage is combined in a kind of helicopter livewire work
Prediction technique, including the air gap between high-voltage conducting wires and suspension helicopter (containing operating personnel) is defined as the first gap 1,
The air gap between suspension helicopter (containing operating personnel) and grounding body is defined as the second gap 2.It is primary by electrostatic field
It calculates and discharge voltage is once predicted, determine which gap first punctures and its discharge voltage value；By electrostatic field secondary calculating and
Discharge voltage re prediction, the discharge voltage value of discharging gap after determining；By comparing the electric discharge electricity in two gaps of discharging one after another
Pressure value obtains the whole discharge voltage predicted value of helicopter livewire work combination the air gap.
The specific implementation of prediction technique the following steps are included:
1, the combination the air gap three-dimensional finite element simulation model under helicopter livewire work operating condition is established, to high-voltage conducting wires
Apply high potential, zero potential is applied to grounding body and truncation air boundary, the suspended conductors such as helicopter and operating personnel are carried out
Current potential Degree-of-freedom Coupling carries out electrostatic field and once calculates.
2, according to calculated result of electrostatic field, the discharge channel in the first gap 1 and the second gap 2 and most short is defined respectively
Path, extract the first gap 1 and 2 discharge channel of the second gap and shortest path Field signature collection, as input parameter,
The discharge voltage value in the first gap 1 and the second gap 2 is once predicted respectively using support vector classification model.If the
The discharge voltage predicted value in one gap 1 is less than the second gap 2, then it is assumed that the first gap 1 is first breakdown, into step 3；If first
The discharge voltage predicted value in gap 1 is greater than the second gap 2, then it is assumed that the second gap 2 is first breakdown, into step 4.
3, after the breakdown of the first gap 1, it is believed that the suspended conductors such as helicopter and operating personnel and high-voltage conducting wires equipotential, root
High potential is applied to suspended conductor according to the potential change situation after the breakdown of the first gap 1, electrostatic field secondary calculating is carried out, extracts the
The Field signature collection in two gaps 2 and as input parameter, electric discharge using support vector classification model to the second gap 2
Voltage carries out re prediction.Second gap 2 in the discharge voltage predicted value and secondary calculating in the first gap 1 in relatively more primary calculating
Discharge voltage predicted value, take the greater as helicopter livewire work combine the air gap discharge voltage predicted value.
4, after the breakdown of the second gap 2, it is believed that the suspended conductors such as helicopter and operating personnel and grounding body equipotential, according to
Potential change situation after breakdown applies zero potential to suspended conductor, carries out electrostatic field secondary calculating, extracts the electricity in the first gap 1
Feature set and as input parameter, carries out two using discharge voltage of the support vector classification model to the first gap 1
Secondary prediction, relatively it is primary calculate in the second gap 2 discharge voltage predicted value and secondary calculating in the first gap 1 discharge voltage
Predicted value takes the greater to combine the air gap discharge voltage predicted value as helicopter livewire work.
Also, the discharge channel in the first gap 1 refers to the space between operating personnel and high-voltage conducting wires with certain size
Region, the shortest path in the first gap 1 refer to operating personnel and away from the straight lines between its nearest high pressure split conductor sub-conductor
Path；The discharge channel in the second gap 2 refers to the space region between Helicopter Main rotor end and grounding body with certain size
Domain, the shortest path in the second gap 2 refer to Helicopter Main rotor end to the straight line path of grounding body minimum distance.
Moreover, Field signature collection includes electric field strength, electric-force gradient, electric field energy, electric field unevenness etc. and electric field phase
The physical quantity of pass.
Moreover, support vector classification model needs to be trained it by training sample set, it should be respectively according to first
The design feature in gap 1 and the second gap 2 selects typical electrode gap or engineering interstitial structure as training sample set.
Also, prediction technique is suitable for 500kV and above transmission line of electricity platform method helicopter livewire work group
Close discharge voltage prediction of the air gap under different gap configuration.
When it is implemented, with phase conductor platform method helicopter livewire work phase-in 1000kV ultrahigh voltage alternating current transmission lines
The air gap between high-voltage conducting wires and suspension helicopter (containing operating personnel) is defined as by ground combinational gap as research object
First gap S1, the air gap between suspension helicopter (containing operating personnel) and grounding body is defined as the second gap S2.Reference
Simulation test arrangement establishes the three-dimensional finite element model of high-voltage conducting wires-helicopter (containing operating personnel)-ground wire combination the air gap,
Electric discharge electricity using the prediction technique of the present embodiment to the combination the air gap under different gap configuration under standard switching impulse
Pressure is predicted, and is compared with test result.
Simulation test arrangement in the present embodiment is with reference to " ultrahigh voltage alternating current transmission lines platform method helicopter livewire work certainly
Safety clearance distance test (DT) research " (" high-voltage technology ", the 4th phase of volume 41 in 2015) includes 6 groups of gap configurations, i.e. S1/S2
Respectively 0.5m/7.0m, 1.0m/6.5m, 1.6m/5.9m, 2.2m/5.3m, 2.8m/4.7m and 3.2m/4.3m.As shown in Figure 1,
It is achieved by the steps of:
One, test is arranged as shown in Figure 2, using phase conductor platform method helicopter livewire work group in the foundation of ANSYS software
Close the three-dimensional finite element simulation model of the air gap.In the model, analog conducting wire is using 8 bundle conductor configurations, length
25m；Simulation ground wire is made of solid conductor, length 20m；Helicopter simulating is to be pressed with 500 helicopter of MD having a size of foundation
The metal shell and metal Rotor Simulation helicopter being made according to the ratio of 1:1；Simulation job personnel are made of aluminium alloy, Gu
Due to the side of job platform and helicopter；Live working platform for helicopter is located above Insulation Test platform, the high 12m of testing stand,
The planform shape at top is 3m × 2.4m × 0.2m cuboid；Insulation column is made of upper and lower two section, and lower part is with four side lengths
The square stone pier of 1.2m does pedestal.
Influence due to insulated pull rod to operating personnel and its neighbouring electric field can be ignored, therefore not establish its model；
Meanwhile insulating cord for hanging analog conducting wire and simulation ground wire and wire termination high-voltage connection can also be ignored.Helicopter band
Electric operation three-dimensional finite element model is as shown in figure 3, apply high potential to 8 split conductors of simulation, to simulation ground wire, the earth and truncation
Air boundary applies zero potential, and it is free to carry out current potential to the suspended conductors such as helicopter simulating and its associate member and livewire work personnel
Degree coupling carries out electrostatic field and once calculates.With S1=1.6m, S2In case where=5.9m, calculated result of electrostatic field is as schemed
Shown in 4.
Two, according to calculated result of electrostatic field, the discharge channel and most in the first gap 1 and the second gap 2 is defined respectively
Short path, as shown in Figure 5.Wherein, the discharge channel in the first gap 1 refers to 8 split conductors of simulation livewire work personnel and simulation
Between with certain size area of space, the shortest path in the first gap 1 refer to livewire work personnel with away from its nearest mould
Straight line path between quasi- 8 split conductor sub-conductors；The discharge channel in the second gap 2 refer to helicopter simulating main rotor end with
There is the area of space of certain size, the shortest path in the second gap 2 refers to helicopter simulating main rotor end between simulation ground wire
Straight line path of the portion to simulation ground wire minimum distance.
Extract the Field signature collection in the first gap 1 and 2 discharge channel of the second gap and shortest path, including electric field strength,
The physical quantity relevant to electric field such as electric-force gradient, electric field energy, electric field unevenness, is shown in Table 1.It, which is specifically defined, can be found in " base
Predicted in Field signature amount and the Air Gap Breakdown Voltage of SVM " (" Proceedings of the CSEE ", 2015 volume 35 the 3rd
Phase) and " prediction technique of electrode air gap breakdown voltage " (Chinese invention patent, ZL 201310752299.1).
The Field signature collection of 1 discharge channel of table and shortest path
Using the Field signature collection in the first gap 1 and the second gap 2 as input parameter, using support vector classification
Model respectively once predicts the discharge voltage value in the first gap 1 and the second gap 2.According between the first gap 1 and second
The design feature of gap 2 is chosen suitable training sample set respectively and is trained to support vector classification.For the first gap 1,
Its training sample includes the interstitial structure of sparking voltage test result known to 3 kinds of rod-rod, ball-plate, conducting wire-shaft tower etc., test
Value respectively with reference to from " test observation of rod-rod gap switching impulse discharge process " (high-voltage technology, 2012 volume 38 the 8th
Phase), " comparison of rod plain gap critical radius and elevation correction research under different altitude height " (China Electric Power Research Institute is large
Bachelorship paper, 2010), " UHV transmission line long air gap insulation characterisitic and field distribution research " (Wuhan University
Ph.D. Dissertation, 2012).For the second gap 2, training sample includes above-mentioned rod-rod gap and rod plain gap,
In, rod plain gap test value is referred to from " Influence of air gap characteristics on line-to-
ground switching surge strength”(IEEE Transactions on Power Apparatus and
Systems, the 8th phase of volume 86 in 1967).
The finite element model for establishing training sample set respectively carries out Electrostatic field calculation and Field signature extracts, and then to support
Vector classification machine is trained, it is made to have predictive ability.By platform method helicopter livewire work the first gap 1 and the second gap
2 Field signature collection is separately input into the support vector classification model after training, exports the first gap 1 and the second gap 2
Prediction result U of discharge voltage1And U2, as shown in Figure 6.Compare U1And U2Size, from fig. 6, it can be seen that in each gap
Under configuration, U1Respectively less than U2, it is believed that the first gap 1 is first breakdown, into third step.
Three, after the breakdown of the first gap 1, it is believed that 8 split conductors of the suspended conductors such as helicopter and operating personnel and simulation etc.
Current potential applies high potential identical with analog conducting wire to suspended conductor according to the potential change situation after the breakdown of the first gap 1, right
Simulation ground wire, the earth and truncation air boundary apply zero potential, carry out electrostatic field secondary calculating.With S1=1.6m, S2=5.9m's
For situation, electrostatic field secondary calculating result is as shown in Figure 7.Extract the Field signature collection in the second gap 2 and as input
Parameter carries out re prediction using discharge voltage of the support vector classification model to the second gap 2.Relatively it is primary calculate in the
The discharge voltage predicted value U in one gap 11With the discharge voltage predicted value U in the second gap 2 in secondary calculating2', comparing result is such as
Shown in Fig. 8.
From figure 8, it is seen that working as S1/S2When for 0.5m/7.0m, 1.0m/6.5m, 1.6m/5.9m and 2.2m/5.3m, U2'
> U1, take U2' as the discharge voltage predicted value for combining the air gap；Work as S1/S2When for 2.8m/4.7m and 3.2m/4.3m, U1>
U2', take U1Discharge voltage predicted value as combination the air gap.In this way, the helicopter band under 6 kinds of gap configurations can be obtained
Electric job mix the air gap discharge voltage prediction result, comparison with test value is as shown in figure 9, predicted value and test value
Maximum relative error is 5.8%, and the prediction result mean absolute percentage error under 6 groups of gap configurations is 4.0%, and error is in work
In journey allowed band.
It can be seen that the prediction technique provided through the invention, can be calculated helicopter livewire work combination air
The discharge voltage in gap, so that the discharge test that alternative cost is high, the period is long, can pacify to obtain the minimum of helicopter livewire work
Full distance provides theoretical direction.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (6)
1. the air gap discharge voltage prediction technique is combined in a kind of helicopter livewire work, characterized in that the following steps are included:
The air gap between high-voltage conducting wires and suspension helicopter and operating personnel is defined as the first gap by step 1, will be suspended
The air gap between helicopter and operating personnel and grounding body is defined as the second gap；
Step 2 is once calculated and discharge voltage is once predicted by electrostatic field, determines the gap first punctured and its discharge voltage
Value；
Step 3 passes through electrostatic field secondary calculating and discharge voltage re prediction, the discharge voltage value of discharging gap after determining；
Step 4, by comparing one after another discharge two gaps discharge voltage value, obtain helicopter livewire work combination air between
The whole discharge voltage predicted value of gap；
The specific implementation of prediction technique the following steps are included:
Step 2.1 establishes combination the air gap three-dimensional finite element simulation model under helicopter livewire work operating condition, leads to high pressure
Line applies high potential, applies zero potential to grounding body and truncation air boundary, carries out current potential to suspension helicopter and operating personnel
Degree-of-freedom Coupling carries out electrostatic field and once calculates；
Step 2.2, according to calculated result of electrostatic field, define the discharge channel in the first gap and the second gap and most short respectively
The Field signature collection of the first gap and the second gap discharge channel and shortest path is extracted in path, as input parameter, adopts
The discharge voltage value in the first gap and the second gap is once predicted respectively with support vector classification model；If between first
The discharge voltage predicted value of gap is less than the discharge voltage predicted value in the second gap, then the first gap is first breakdown, carries out step
2.3；If the discharge voltage predicted value in the first gap is greater than the discharge voltage predicted value in the second gap, the second gap is first hit
It wears, enters step 2.4；
After step 2.3, the first gap breakdown, suspension helicopter and operating personnel and high-voltage conducting wires equipotential, according to the first gap
Potential change after breakdown applies high potential to helicopter and livewire work personnel, carries out electrostatic field secondary calculating, extracts second
The Field signature collection in gap and as input parameter, using support vector classification model to the discharge voltage in the second gap
Carry out re prediction；Relatively it is primary calculate in the first gap discharge voltage predicted value and secondary calculating in the second gap electric discharge
Voltage prediction value takes the greater to combine the air gap discharge voltage predicted value as helicopter livewire work；
After step 2.4, the second gap breakdown, helicopter and livewire work personnel and grounding body equipotential, according to the electricity after breakdown
Position variation applies zero potential to helicopter and livewire work personnel, carries out electrostatic field secondary calculating, extracts the electric field in the first gap
Feature set and as input parameter, carries out the discharge voltage in the first gap using support vector classification model secondary pre-
It surveys, the discharge voltage in the first gap is predicted in the discharge voltage predicted value and secondary calculating in the second gap in relatively more primary calculating
Value takes the greater to combine the air gap discharge voltage predicted value as helicopter livewire work.
2. the air gap discharge voltage prediction technique is combined in helicopter livewire work as described in claim 1, characterized in that high
Conducting wire is pressed to use high pressure bundle conductor configuration, grounding body uses solid conductor.
3. the air gap discharge voltage prediction technique is combined in helicopter livewire work as claimed in claim 2, characterized in that the
The discharge channel in one gap refers to that the area of space between operating personnel and high-voltage conducting wires, the shortest path in the first gap refer to operation people
Member and away from the straight line path between its nearest high pressure split conductor sub-conductor；The discharge channel in the second gap refers to that Helicopter Main revolves
Area of space between tip extension and grounding body, the shortest path in the second gap refer to that Helicopter Main rotor end is nearest to grounding body
The straight line path of distance.
4. the air gap discharge voltage prediction technique is combined in helicopter livewire work as described in claim 1, characterized in that electricity
Field feature set includes electric field strength, electric-force gradient, electric field energy, electric field unevenness.
5. the air gap discharge voltage prediction technique is combined in helicopter livewire work as described in claim 1, characterized in that branch
Vector classification machine model needs are held according to the design feature in the first gap and the second gap, are selected between typical electrode gap or engineering
Gap structure is trained to obtain as training sample set to it.
6. the air gap discharge voltage prediction technique is combined in helicopter livewire work as described in claim 1, characterized in that pre-
Survey method is suitable for 500kV and above transmission line of electricity platform method helicopter livewire work combination the air gap in difference
Discharge voltage prediction under the configuration of gap.
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| CN110929434B (en) * | 2018-09-19 | 2022-04-15 | 武汉大学 | Simulation calculation method for development process of combined gap impulse discharge |
| CN110907707A (en) * | 2019-12-06 | 2020-03-24 | 广东电网有限责任公司 | Device and method for testing influence of ground wire claw gap discharge on unmanned aerial vehicle |
| CN112186818B (en) * | 2020-11-30 | 2021-02-12 | 中国电力科学研究院有限公司 | Device for carrying out high-potential on-line energy obtaining on high-voltage overhead line |
| CN113468776B (en) * | 2021-06-08 | 2022-09-16 | 南昌大学 | Electric field distribution characterization method for air gap of power transmission line tower |
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| JPS6234076A (en) * | 1985-08-07 | 1987-02-14 | Hitachi Cable Ltd | Method for measuring dielectric breakdown of sheet like insulator |
| EP0858605A4 (en) * | 1996-05-08 | 1999-08-18 | Global Atmospherics Inc | Systems for determining fault location on power distribution lines |
| CN103678941B (en) * | 2013-12-31 | 2016-08-17 | 武汉大学 | The Forecasting Methodology of electrode air gap breakdown voltage |
| CN103675629B (en) * | 2013-12-31 | 2016-03-02 | 武汉大学 | Based on the electrode discharge inception voltage Forecasting Methodology of Field signature amount |
| CN104880650A (en) * | 2015-05-26 | 2015-09-02 | 武汉大学 | Air gap breakdown voltage prediction method |
| CN105678014B (en) * | 2016-01-30 | 2018-11-23 | 武汉大学 | A kind of energy storage characteristic of gas medium and discharge voltage prediction technique |
| CN106548025B (en) * | 2016-10-28 | 2019-05-17 | 广东电网有限责任公司珠海供电局 | A kind of the air gap discharge voltage prediction technique and device |
| CN107085172A (en) * | 2017-04-11 | 2017-08-22 | 华南理工大学 | A kind of Oil-Paper Insulation breakdown voltage Forecasting Methodology based on SVMs |
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