CN110516351A - A kind of double insulator string suspension angles optimization method based on insulator contamination accumulation characteristics - Google Patents
A kind of double insulator string suspension angles optimization method based on insulator contamination accumulation characteristics Download PDFInfo
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- 239000012212 insulator Substances 0.000 title claims abstract description 145
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
Abstract
The present invention is a kind of composite insulator suspension angles optimization method based on insulator contamination accumulation characteristics, which is characterized in that described method includes following steps: 1) carrying out force analysis to insulator ambient contamination composition granule；2) wind speed, the contaminant particle concentration, the variation range of grain diameter of air flow field are determined；3) the insulator Simulation Calculation under different suspension angles is established；4) insulator surrounding air Flow Field Distribution under different suspension angles is calculated；5) changing rule of contaminant particle and different suspension angles insulator collision rates is analyzed；6) the optimized suspension angle of double insulator string is determined according to the simulation result in 5).This method, by the contamination accumulation characteristics of different suspension angles insulators, determines optimum suspension angles based on the contamination accumulation characteristics of insulator, prevents the generation of insulator contamination accident from hang.
Description
Technical field
The present invention relates to a kind of double insulator string suspension angles optimization method based on insulator contamination accumulation characteristics, especially relates to
And a kind of research method of the insulator contamination accumulation characteristics based on Fluent finite element stimulation.
Background technique
By in June, 2018, State Grid Corporation of China's electric system is total in 110 (66) kV of fortune and the above overhead transmission line
48050 times, 941514.39 km of length, with the expansion of power grid scale and the raising of voltage class, ultra-high-tension power transmission line corridor
Weather environment it is complicated and changeable, external insulation electric strength of the overhead transmission line under the meteorological conditions such as ice, snow, mist, dew, drizzle
It substantially reduces, under the influence of extreme weather, the icing of transmission line of electricity is easily caused to overload the generation of phenomenon, to cause a large amount of
The accidents such as high-voltage conducting wires are stranded, the disconnected string of broken string, insulator, it may also happen that transmission tower falls the generation of the accidents such as tower when serious.
Double string hangs are mostly used to increase the security and stability of transmission line of electricity, it is current that China's straight line pole hangs conducting wire
Main to use double II type hangs, a small number of transmission line of electricity double insulator strings use V-type or inverted V type hang.To transmission of electricity
Route ice and snow flashover region carries out Anti-ice-and-snow transformation, and using double string hangs of enlarged umbrella skirt composite insulator, can be with
Dramatically increase the mechanical performance of transmission line of electricity, the ability of Anti-ice-and-snow flashover, wind-deviation and string falling prevention.Power department and correlation
Researcher is special to the electric field of the mechanical performance of V string and the insulator string of falling V, the contamination performance of common insulator and insulator respectively
Property is studied, but is seldom optimized from the angle of insulator contamination performance to insulator suspension angles, different
Under hang, the suspension angles of insulator are all changed, so that the flow field around insulator umbrella also changes, most
Cause the contamination accumulation characteristics of insulator under different suspension angles also different eventually, therefore, it is necessary to from preventing insulator contamination accident from sending out
Raw aspect optimizes analysis to suspension angles.
Summary of the invention
The purpose of the present invention is, compound to big full skirt exhausted by the insulation submodel established under different suspension angles
The contamination process of edge is further analyzed, and obtains the contamination accumulation characteristics of the type composite insulator, is composite insulator
Full skirt optimization design provides certain theoretical foundation, around insulator under the contamination accumulation characteristics of insulator and different suspension angles
Flow Field Distribution analysis, obtain the optimal suspension angles of double insulator string.
Based on foregoing invention purpose, the present invention is improved and is passed on the basis of the research of the contamination accumulation characteristics of conventional composite insulator
The insulator hanging method of system, for the hang of V-type and Down V-shaped Insulation, to the product of insulator under different suspension angles
Dirty characteristic is analyzed, and proposes the optimization method for being suitble to the double string composite insulator suspension angles of big full skirt.This method synthesis is examined
The many factors such as the partial size of contaminant particle, the concentration of pollutants in air particle, wind speed, insulator suspension angles are considered, have led to
It crosses Fluent fluid emulation software to analyze the contamination accumulation characteristics of insulator, using the simulation calculation of single-phase coupling, simplify
It calculates and the period of test, so that calculated result is more accurate, optimizes reason is provided for the hangs of double string composite insulators
By foundation, help to reduce pollutant from source in the deposition of insulator surface, to reduce the hair of insulator contamination accident
It is raw.
The present invention specifically adopts the technical scheme that a kind of composite insulator suspension angle based on insulator contamination accumulation characteristics
Spend optimization method.The specific steps are that:
1) force analysis is carried out to insulator ambient contamination composition granule；
2) according to the Meteorological Characteristics of transmission line of electricity their location, wind speed, air humidity, the pollutant of air flow field are determined
Grain concentration and the variation range of grain diameter etc.；
3) the insulator Simulation Calculation under different suspension angles is established；
4) insulator surrounding air Flow Field Distribution under different suspension angles is calculated；
5) changing rule of contaminant particle and different suspension angles insulator collision rates is analyzed；
6) the optimized suspension angle of double insulator string is determined according to the simulation result in 5).
Preferably, being equivalent to ball when carrying out force analysis to insulator ambient contamination composition granule in step 1)
Shape particle, and the influence of Main Analysis fluid drag and gravity.
Preferably, in step 2), contaminant particle concentration of the their location under different weather environments, wind speed are collected
Size, air humidity take in-between value as the steady state value of contaminant particle concentration, wind speed size, air humidity to emulate
It is used in calculating, and during simulation calculation, the concentration of contaminant particle is converted to of flow field inlet unit area
Grain number amount.
Preferably, the Simulation Calculation in step 3), chooses single branch insulator in V-type double insulator string, it is right
Contamination accumulation characteristics under its different suspension angles are analyzed, specifically setting cuboid flow field, and make the double insulator string
Symmetry axis is located at the air inlet in the cuboid flow field and the 1/3 of air outlet line, and cuboid flow field side is air inlet, another
Side is air outlet.
Preferably, the partial size of contaminant particle and single insulator string of V-type double insulator string are hung in step 5)
Angle carrys out the changing rule of simulation calculation contaminant particle Yu insulator collision rate as variable.
It is further preferred that being divided into airflow direction both of these case parallel and vertical with V-type face in step 5) and carrying out respectively
Simulation calculation.
Preferably, in step 6), according to the partial size of contaminant particle object it is preferable to determine double insulator strings respectively most
Good suspension angles.
It is further preferred that when transmission line of electricity region contaminant particle partial size is smaller, the suspension angle of insulator
It should minimize；And when transmission line of electricity region contaminant particle partial size is larger, to avoid suspension angle is 60 °.
The present invention specifically has the beneficial effect that:
1, a kind of specific prioritization scheme of double string composite insulator suspension angles is proposed, this method is with the contamination of insulator
Based on characteristic, by the contamination accumulation characteristics of different suspension angles insulators, optimum suspension angles are determined, from hang
The generation of upper prevention insulator contamination accident.
2, big full skirt composite insulator simulation calculation under different suspension angles is established using finite element emulation software Fluent
Model is analyzed perpendicular to V-type face wind direction with the air-flow for being parallel to V-type face wind direction, obtains and insulate under different suspension angles
The contamination accumulation characteristics of son, can shorten the test period by simulation calculation, can for the problem that humidity in Experimental Research is difficult to control
Simulation calculating is carried out by finite element simulation, test and research cost is saved, shortens the design cycle of track remodelling.
3, under variable grain partial size, collision rate is analyzed with the changing rule of suspension angles, chooses grain diameter
Range is 1 μm~50 μm, and is analyzed respectively the changing rule of the collision rate of large-size particles and small particle.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is insulator ambient contamination composition granule stress analysis schematic diagram；
Fig. 2 is that V-type or Down V-shaped Insulation simplify Simulation Calculation；
Fig. 3 is that fluid flow fields domain simulation lattice divides schematic diagram；
Insulator ambient air pressure cloud atlas under difference suspension angles when Fig. 4 is parallel with V-type face for airflow direction；
Insulator ambient air pressure cloud atlas under difference suspension angles when Fig. 5 is vertical with V-type face for airflow direction；
Contaminant particle collision rate changing rule under difference suspension angles when Fig. 6 is little particle；
Contaminant particle collision rate changing rule under difference suspension angles when Fig. 7 is bulky grain；
Fig. 8 is the local motion trajectory diagram of contaminant particle.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened is fully disclosed to those skilled in the art.
In a specific embodiment of the invention, angle is hung to double string composite insulators based on insulator contamination accumulation characteristics
Degree optimizes, specific step are as follows:
1, force analysis is carried out to insulator ambient contamination composition granule:
When carrying out force analysis to micropollutants particle, it is equivalent to spheric granules.Around composite insulator
Contaminant particle stress is as shown in Figure 1, wherein F1It is fluid drag, F2It is electric field force, G is gravity, and arrow direction is fluid stream
To.
(1) active force that electric field generates
There are electric fields around insulator in actual motion route, generate polarization force and electric field force to contaminant particle.Electricity
The both ends of contaminant particle in will be polarized into the charge of opposed polarity, and of polarization charge is had under the action of electric field
Grain will will receive the effect of polarization force, and the formula of polarization force is
A is the radius of contaminant particle, m；ε0For permittivity of vacuum；εrFor the relative dielectric constant of particle,Electric-field strength
Degree, V/m.By formula it is found that no matter how electric field strength changes, the direction that electric field becomes strong is directed toward in polarization force direction forever,
Particle not will receive polarization force in uniform electric field.The polarization force being subject to.
Contaminant particle charges ground mechanism there are mainly three types of mode in air: electrostatic is charged, diffusional charging and field cause lotus
Electricity.Charged particle will receive the effect of electric field force under the action of electric field:
WhereinIndicate that the electric field force that particle is subject to, q are the carried charge of particle, C；Electric field strength, V/m.
(2) active force that air field generates
Contaminant particle is in air field mainly by fluid drag, thermophoretic forces, Basset power, virtual mass power, Blang
Motoricity, barometric gradient power, Saffman lifting force etc..The influence that fluid drag moves particle is maximum, other active forces are certainly
It is smaller under right state, it can be ignored substantially, the motion model of fluid is mainly turbulence model at present in air, and air glues
Property be can not ignore.
(3) active force that gravitational field generates
Assuming that the radius of spheric granules is a, then the gravity expression formula of particle are as follows:
ρ in formulapFor the density of contaminant particle, kg/m3；Acceleration of gravity, m/s2。
Although force analysis mainly considers fluid drag, electric field force and gravity, polarization force and electric field force are relatively small, absolutely
Edge surrounding electric field also hardly changes the motion profile of particle, and particle can only be made to be more firmly attached to insulation sublist
Face, and the present invention mainly studies the collision rate and particle motion trajectory of contaminant particle and insulator surface, therefore in simulation calculation
Ignore the influence of electric field force in analytic process.
2, wind speed, the air humidity, the variation range of granule density, grain diameter of air flow field are determined
To probe into influence of the different suspension angles to insulator contamination spy's characteristic, the present invention is suspension angles and grain diameter
As independent variable, controlling airborne particulate concentration, wind speed, air humidity is steady state value.
Research shows that particle concentration of certain city under different weather environments is in 30 μ g/m3~260 μ g/m3Between, it chooses
The 150 μ g/m of median of granule density3As granule density, during simulation calculation, the concentration of contaminant particle is turned
It is melted into the amounts of particles of flow field inlet unit area, size is 44784/m2.According to analysis, wind speed size is set as
10m/s, the relative humidity set of air are 50%.The variation range for choosing the suspension angles of single insulator string is 0 °~60 °,
Grain particle size range is 1 μm~50 μm.
3, the insulator simulation model under different angle is established:
In order to simplify Simulation Calculation, the ratio of single branch insulator 1: 1 in V-type double insulator string is chosen, and intercept
1.5 full skirt units are analyzed the contamination accumulation characteristics under its different suspension angles, specifically setting cuboid flow field, flow field
The size in region is 2500 × 3000 × 3500mm, and flow field regions, which meet above-mentioned condition, can effectively avoid boundary effect, rectangular
Body flow field side is air inlet, and the other side is air outlet, and the symmetry axis of the double insulator string is made to be located at the cuboid flow field
Closer to air outlet side, such as at the 1/3 of air inlet and air outlet line, the influence to avoid air inlet blow-through to result.
When V-type or inverted V type double insulator string angle are 30 °, single insulator string suspension angles are 15 ° or -15 °, vertical direction
The suspension angles in left side are defined as negative value, are positive value on the right side of vertical direction, insulator simulation model is as shown in Figure 2.
4, Flow Field Distribution around insulator is calculated under different suspension angles:
Insulator may be by the air-flow of different directions, respectively to perpendicular to V-type face and being parallel to V-type face in transmission line of electricity
The influence of air-flow is analyzed.Because the shape of insulator surface is complex, the radius of curvature with very little, therefore for imitative
The required precision of the grid dividing of true mode is higher, and fluid mass is divided into 9 parts and is adopted in the region around insulator
Subdivision is carried out with tetrahedral grid, and in the region contacted with insulator surface using the grid more refined；For flow field mould
Other 8 regions of type carry out grid dividing, the grid dividing schematic diagram of simulation model using hexahedral mesh convection current field areas
As shown in Figure 3.
When airflow direction is parallel with V-type face, as shown in Fig. 2, the face a in flow field is set as air inlet, the face b is set as out
The insulator of different suspension angles is arranged in air port in air flow field, to the contamination accumulation characteristics of insulator under different suspension angles into
Row analysis.
When airflow direction is vertical with V-type face, the face c in flow field is set as air inlet, the face d is set as air outlet, in sky
The insulator of different suspension angles is set in airflow field, the contamination accumulation characteristics of insulator under different suspension angles are analyzed.
There are biggish turbulent flow when by flow field around insulator, model emulation can solve air-flow when being calculated
The equation of momentum of flowing, then pressure correction equation is solved, turbulence control equation is finally solved, when to model solution,
Equation is calculated by RNG k- ε turbulence model.
The turbulent motion model of continuous phase is calculated frequently with N-S equation, specific Navier-Stokes controlling party
Journey are as follows:
Wherein u is the speed of air fluid, unit m/s；ρ is fluid density, unit kgm-3；P is Fluid pressure；
μ is air-flow viscosity；F is the mass force of per unit mass fluid；xi, xjRespectively indicate three cartesian components (i, j=1,2,
3, i ≠ j)；It is eddy stress component.
Increase the quantity of equation using RNG k- ε turbulence model, to solve turbulence model, wherein k refers to the dynamic of turbulent flow
Can, m2·s-2, it is dissipative shock wave, m that ε, which refers to,2·s-3, specific equation is as follows:
Wherein GkRefer to the tubulence energy that average velocity gradient generates, CμRefer to empirical, size 0.0845,
C1εIt * include the time mean strain rate of primary fluid flow, C2εIt is constant, size 1.68.
(1) parallel current is in V-type insulator face
When airflow direction is parallel with V-type face, with the variation of suspension angles, the wind area of insulator also can be gradual
Reducing, the right side of insulator is air inlet, and left side is air outlet, under different suspension angles, stress cloud atlas such as Fig. 4 institute of insulator
Show (Fig. 4 a is 15 °, and Fig. 4 b is 30 °, and Fig. 4 c is 45 °).When insulator suspension angles are smaller, the direction of flow of flow field apoplexy with
The full skirt of insulator is substantially parallel, bears the predominantly core rod of insulator of wind load at this time, with the increase of suspension angles, absolutely
Huge variation has occurred in air flow field around edge, and big full skirt has blocked the movement of air-flow, and the flow field near big full skirt becomes
Change is more violent, and insulator suspension angles are bigger, and the effect of blocking of big full skirt is just more obvious, and flow field occurs bright near big full skirt
Aobvious variation.
(2) air-flow is perpendicular to V-type insulator face
Under the wind speed of 10m/s, (Fig. 5 a is 15 ° to the air pressure cloud atlas of different suspension angles insulators, Fig. 5 b as shown in Figure 5
It is 30 °, Fig. 5 c is 45 °).As seen from the figure, under different suspension angles, the size of the air pressure around insulator becomes without obvious
Change, and the distribution in flow field is similar.This is mainly due to when airflow direction is vertical with V-type face, with the increasing of suspension angles
Add, the area that insulator bears wind is constant, so that full skirt and plug are basically unchanged with the probability that particle collides.
5, the changing rule of contaminant particle and different suspension angles insulator collision rates is analyzed:
After calculating insulator Flow Field Distribution, solid particle is added in air medium, single air fluid becomes
For the Two-phase flow's separation of Gas-solid Coupling, during fluid structurecoupling by the way of single-phase coupling.For the particle of discrete phase
Motion profile is calculated according to the mechanical balance formula of particle, in Fluent simulation software, passes through the power of Lagrange remainder
The differential equation calculate, it is as follows that the differential equation is converted to the equation in cartesian coordinate system, and direction is x-axis direction:
Wherein u refers to the speed of air fluid, unit m/s；upRefer to the speed of contaminant particle, unit m/
s；gxIt is acceleration of gravity, unit ms-2；ρpIt is grain density, unit kg/m3；μ is air fluid viscosity, dpIt refers to
The diameter of contaminant particle, unit m；CDIt is the resistance coefficient of fluid, can be indicated with Reynolds number.
Re is Reynolds number, and under different process distribution occasions, simulation software assigns a1, a2, a3Corresponding numerical value is not
Together.
The distribution of the air flow field around insulator is found out using first with turbulence model herein, adds the dirt of discrete phase
Composition granule is contaminated, Particles Moving track of the contaminant particle in different flow fields environments is calculated.
Initial velocity contaminant particle identical with flow field velocity is added in air flow field, analyzes lower of different suspension angles
The collision situation of grain and insulator surface.It, can be by insulator when contaminant particle in flow field and insulator surface collide
Surface absorption, remaining contaminant particle are absorbed by the outer wall in flow field, pass through the ratio of the particle absorbed by insulator surface, judgement
The collision rate of contaminant particle.
Using single insulator string suspension angles of the partial size of contaminant particle and V-type double insulator string as variable, to emulate
Calculate the changing rule of contaminant particle and insulator collision rate.
(1) compared with the particle of small particle (10 μm of <) with suspension angles changing rule
The changing rule of different-grain diameter particle collision rate under different suspension angles is as shown in Figure 6.When grain diameter is smaller
When, for different-grain diameter particle with the increase of insulator suspension angles, the collision rate of particle is in increased trend substantially, mainly because
For with the increase of insulator tilt angle, the angle between full skirt and air-flow increases, and particle collides several with insulator surface
Rate increases, so that the collision rate of insulator increases.
(2) particle of big partial size (10 μm~50 μm) is with suspension angles changing rule
With becoming larger for grain diameter, collision rate is with the increase of suspension angles and increased trend gradually weakens, and particle touches
The changing rule of rate is hit as shown in fig. 7, being 10 μm~50 μm of particle for partial size, when insulator suspension angles increase to from 0 °
At 30 °, the magnetic rate of hitting is gradually increased, and as suspension angles further increase, INVESTIGATION OF INTER-PARTICLE COLLISION RATE shows downward trend.
(3) INVESTIGATION OF INTER-PARTICLE COLLISION RATE under different airflow directions
Influence of the suspension angles to INVESTIGATION OF INTER-PARTICLE COLLISION RATE under different airflow directions is further analyzed, choosing partial size is respectively 25 μm
With 50 μm of particle, the changing rule of INVESTIGATION OF INTER-PARTICLE COLLISION RATE is as shown in table 1 under different suspension angles.It is parallel with V-type face to compare wind direction
With vertical both of these case it is found that INVESTIGATION OF INTER-PARTICLE COLLISION RATE is larger when wind direction is perpendicular to V-type face, with the increase wind-engaging of suspension angles
Area does not change, but when wind direction is parallel to V-type face, with the variation of suspension angles, the wind area of insulator
It gradually decreases, significant change also occurs for the flow field around insulator at this time.
INVESTIGATION OF INTER-PARTICLE COLLISION RATE under table 1, different suspension angles
(4) motion profile of particle
Fig. 8 be insulator neighboring particles movement Local map, most of particle under the action of fluid drag and gravity around
Cross insulator surface；The effect of blocking of full skirt and plug, under the influence of turbulent flow and small vortex, motion profile is changed,
Partial particulate has bypassed insulator surface, and a small number of contaminant particles are collided with insulator umbrella or plug, in vortex
Under the influence of, it collides in leeward side and insulator surface.
6, the optimized suspension angle of double insulator string is determined according to the simulation result in 5:
(1) when transmission line of electricity region grain diameter is smaller, with the increase of V-type insulator suspension angles, particle
Collision rate gradually increase, therefore in the lesser region of grain diameter, the suspension angle of insulator should be minimized.
(2) when transmission line of electricity region grain diameter is larger, when suspension angles are 60 °, the collision rate of insulator
Suspension angle should be avoided at 60 ° or so in maximum at this time.
(3) when air-flow is vertical with V-type face, composite insulator wind area is larger, and the collision rate of particle is than air-flow and V-type
Collision rate when face is parallel is high.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (8)
1. a kind of composite insulator suspension angles optimization method based on insulator contamination accumulation characteristics, which is characterized in that the method
Include the following steps:
1) force analysis is carried out to insulator ambient contamination composition granule；
2) according to the Meteorological Characteristics of transmission line of electricity their location, determine that wind speed, air humidity, the contaminant particle of air flow field are dense
Degree and the variation range of grain diameter etc.；
3) the insulator Simulation Calculation under different suspension angles is established；
4) insulator surrounding air Flow Field Distribution under different suspension angles is calculated；
5) changing rule of contaminant particle and different suspension angles insulator collision rates is analyzed；
6) the optimized suspension angle of double insulator string is determined according to the simulation result in 5).
2. according to the method described in claim 1, it is characterized by: in step 1) to insulator ambient contamination composition granule carry out by
Power is equivalent to spherical shape, and the influence of Main Analysis fluid drag and gravity when analyzing.
3. according to the method described in claim 1, it is characterized by: collecting their location in different weather environments in step 2)
Under contaminant particle concentration, wind speed size, air humidity, take in-between value as contaminant particle concentration, wind speed size, sky
The steady state value of air humidity degree converts the concentration of contaminant particle to use in simulation calculation, and during simulation calculation
At the amounts of particles of flow field inlet unit area.
4. according to the method described in claim 1, it is characterized by: Simulation Calculation in step 3), it is exhausted to choose the double strings of V-type
Single branch insulator in edge is analyzed the contamination accumulation characteristics under its different suspension angles, specifically setting cuboid flow field,
And it is located at the symmetry axis of the double insulator string at the air inlet in the cuboid flow field and the 1/3 of air outlet line, cuboid
Flow field side is air inlet, and the other side is air outlet.
5. according to the method described in claim 1, it is characterized by: the partial size of contaminant particle and V-type pair are gone here and there in step 5)
Single insulator string suspension angles of insulator are the variation rule for coming simulation calculation contaminant particle and insulator collision rate as becoming
Rule.
6. according to the method described in claim 5, it is characterized by: it is parallel and vertical with V-type face to be divided into airflow direction in step 5)
Straight both of these case carries out simulation calculation respectively.
7. according to the method described in claim 1, it is characterized by: being distinguished in step 6) according to the partial size of contaminant particle object
It is preferable to determine the optimized suspension angles of double insulator string.
8. according to the method described in claim 7, it is characterized by: when transmission line of electricity region contaminant particle partial size is smaller
When, the suspension angle of insulator should minimize；And when transmission line of electricity region contaminant particle partial size is larger, it to avoid
Hanging angle is 60 °.
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