CN108982979A - A kind of surrounding space field distribution characterizing method of high-tension shielding fitting - Google Patents
A kind of surrounding space field distribution characterizing method of high-tension shielding fitting Download PDFInfo
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Abstract
The present invention relates to a kind of surrounding space field distribution characterizing methods of high-tension shielding fitting, high-tension shielding fitting is mainly used in the direct current transportation occasion such as converter station valve hall, including shielding ball and shading ring, the space electric field distribution around high-tension shielding fitting is one of an important factor for influencing its corona characteristic.The present invention is according to electrostatic field simulation calculation, the feature set to characterize the distribution of its space electric field is extracted around shielding fitting, including line feature, region feature and body characteristics three categories, characteristic quantity includes electric field strength, electric-force gradient, electric field energy, energy density, electric field distortion rate and Length Quantity, amount of area, volume etc..High-tension shielding fitting surrounding space field distribution feature set proposed by the present invention is easily obtained, and is capable of the surrounding space field distribution of Efficient Characterization shielding fitting, and the corona characteristic assessment that can be applied to high-tension shielding fitting is predicted with discharge inception voltage.
Description
Technical field
The invention belongs to high voltage and insulation applications more particularly to a kind of surrounding space field distributions of high-tension shielding fitting
Characterizing method.
Background technique
Converter station valve hall is the maincenter of DC transmission engineering, is had when operating normally to valve hall inside hardware corona situation
Stringent control requirement, and the equipment such as pipe mother connecting portion, set passage, valve block, arrester grading ring are electric nearby in valve hall
Field is extremely uneven, needs to shield fitting and presses it, prevents corona.Accordingly, there exist a large amount of high-tension shielding fittings such as to shield
It covers ring, shielding ball and corona does not occur to control high-tension apparatus, it can be in valve hall to the research of the corona characteristic of high-tension shielding fitting
The design for shielding fitting provides reference.
Corona discharge is gas medium distinctive part self-maintained discharge phenomenon in non-uniform electric field, is a kind of common gas
Body discharge type.When electric field strength is larger near conductor, strong ionization can occur for the region of electric-field strength, when ionization develops to
When to a certain degree, nearby usually there is the phenomenon and with hiss of emitting light and heat in conductor, generate corona, corona only limits attached in conductor
Nearly one piece of minimum region, entire the air gap does not puncture.Due to the inhomogeneities of electric field, main ionization process in corona process
It is confined near the electrode of radius of curvature very little, which is known as ionized region, also referred to as corona layer, layer internal electric field Relatively centralized, electricity
The position is mainly also occurred in from excitation.Region other than ionized space is referred to as migration area, the region electric field intensity inside high compared with
It is weak, ionization process is hardly happened, the conduction of electric current relies primarily on the travel motion of negative ions, they determine the region
Conductance.Corona starting characteristic and electrode shape, on-load voltage, environmental factor are closely related, and electrode shape can then reflect electricity
In field distribution.Document " prediction of the corona inception voltage of DC wire and valve hall fitting " (electrotechnics journal, 2016 volume 31
12nd phase, page number 80-89) in demonstrate electrode structure and mainly influence its corona characteristic, and electric field by changing field distribution
There are internal associations with corona inception voltage for distribution.
Summary of the invention
In consideration of it, the present invention provides a kind of surrounding space field distribution characterizing method of high-tension shielding fitting, to quantitative
The field distribution of high-tension shielding fitting surrounding space is described, can be further the corona performance of evaluation high-tension shielding fitting, realization
The prediction of high-tension shielding fitting discharge inception voltage lays the foundation.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of surrounding space field distribution characterizing method of high-tension shielding fitting, which is characterized in that for shielding fitting, choosing
Select line, face, three dimensions of body Characteristic Extraction region, respectively
Line feature: to shield fitting electric field strength maximum value EmFor starting point, it is denoted as point A, is changed along electric field strength most fast
Direction, arrive at aEmPoint, be denoted as B, AB sections of point be line feature extraction region；Electric field strength, electric field in extraction AB section
Gradient, field integral, AB segment length, field intensity value are greater than bEmPath length etc. be used as line characteristic quantity, the electric field strength and
Electric-force gradient includes maximum value and average value；
Region feature: extracting region is entire shielding fitting surface, extracts average field intensity, the field on shielding fitting surface
Intensity values are greater than bEmRegion surface product, electric field distortion rate etc. be used as region feature amount；
Body characteristics: centered on shielding fitting, the distance at shielding fitting center to B point is that radius makees ball or golden with original shielding
The tool ring that shape is similar but caliber is bigger shoots off former shielding fitting itself and is formed by the extraction area that area of space is body characteristics
Domain；It extracts the average field intensity in the region, electric field energy, energy density, field intensity value and is greater than bEmSpatial volume,
Electric field distortion rate etc. is used as body characteristics amount.
In a kind of surrounding space field distribution characterizing method of above-mentioned high-tension shielding fitting, characteristic quantity specific formula for calculation
It is as follows:
Electric field strength, including maximum value EmWith average value Ea:
Em=max (Ei) (i=1,2 ..., n) (1)
In formula, EiThe electric field intensity value for i-th of the data point chosen on region, n are extracted for corresponding line, face, body characteristics
For selected data point sum；
Electric-force gradient in AB section, including maximum value EgmWith average value Ega:
Egm=max (|-gradEi|) (i=1,2 ..., n) (3)
Electric field energy W and energy density Wd:
Wd=W/V (6)
In formula, m is the element number in body characteristics extraction region, ε0For permittivity of vacuum, EiIt is i-th of body unit
Electric field strength, ViIt is the volume of i-th of body unit, V is the total volume that body characteristics extract region；
AB sections of field integral EV:
In formula, diFor the length between adjacent equidistant data point, di=LAB/(n-1)；
Path length, including AB sections of length LAB, field intensity value is greater than bEmPath length Lb:
In formula, p is that field intensity value is greater than bEmData point number；
Region feature extracts field intensity value in region and is greater than bEmRegion surface product Sb:
In formula, q is that field intensity value is greater than bE in region feature extraction regionmFace unit number, SiFor the face of each unit
Product；
Body characteristics extract field intensity value in region and are greater than bEmSpatial volume Vb:
In formula, u is that field intensity value is greater than bE in body characteristics extraction regionmBody unit number, ViFor the body of each unit
Product；
Region feature extracts the electric field distortion rate E in region and body characteristics extraction regionda、Edv, it can be calculate by the following formula:
Ed=Em/Ea (11)
In formula, EmAnd EaThe field strength maximum value and average value being respectively calculated according to formula (1), formula (2).
In a kind of surrounding space field distribution characterizing method of above-mentioned high-tension shielding fitting, the aEmAnd bEm
In a, b be proportionality coefficient；For the value of a between 0.25 and 0.45, value should make the field intensity value of B point be less than air ionization layer
The field strength on boundary；For the value of b between 0.45 and 0.95, the value of b can choose multiple values simultaneously, constitute multiple characteristic quantities.
Compared with prior art, the invention has the advantages that and the utility model has the advantages that 1, propose that a kind of characterization shielding fitting is all
The Field signature collection of confining space distribution, compared with existing feature set extracting mode, extracting mode of the invention is more bonded electricity
Dizzy characteristic and corona mechanism of production can effectively reflect the space electric field distribution for influencing corona starting.2, the space electric field extracted is special
Collection is suitable for two kinds of shielding fittings of mainstream --- and shielding ball and shading ring, definition is simple, and extracting mode is easy, space characteristics
Collection can be obtained by Computer Simulation, convenient and efficient.
Detailed description of the invention
Fig. 1 is that high-tension shielding fitting space electric field feature set of the present invention extracts area schematic.
Fig. 2 is the typical shielding ball layout figure in the embodiment of the present invention.
Fig. 3 is the shielding ball field distribution cloud atlas in the embodiment of the present invention.
Specific embodiment
One, specific method principle of the invention is introduced first.
The present invention provides a kind of surrounding space field distribution characterizing method of high-tension shielding fitting, to quantitative description high pressure
The field distribution of fitting surrounding space is shielded, can be the further corona performance of evaluation high-tension shielding fitting, realization high-tension shielding
The prediction of fitting discharge inception voltage lays the foundation.
The present invention adopts the following technical scheme:
For shielding fitting, either shielding ball or shading ring, can necessarily find electrode surface field strength most
Big value EmPoint, as shown in Figure 1, being denoted as A point, corona discharge has very maximum probability in this region.Secondly, A can be found
The point direction nearest apart from zero potential, electric-force gradient is maximum in this direction.Then finding electric field strength in this direction is aEm
A bit, be denoted as B point.In general, it can be calculated by photo-ionisation criterion, the electric field strength on air ionization layer boundary is
24kV/cm, aEmShould be less than this field intensity value, the space electric field feature set that the present invention defines extracts region and enumerates ionosphere,
The condition for having reflection or evaluation shielding hardware corona performance.
The extraction region of line feature is AB sections shown in Fig. 1, and the extraction region of region feature is shielding fitting surface, body characteristics
Extract region be centered on shielding fitting, shielding fitting center to B point distance for radius make ball or with original shape it is similar but
The bigger ring of caliber shoots off former shielding fitting itself and is formed by area of space, as shown in Figure 1.
Since the characteristic quantity of three dimensions is respectively line feature, region feature and body characteristics, the week of high-tension shielding fitting
Confining space field distribution characteristic sub-area domain is defined and extracts.For line feature, electric field strength in AB section is extracted (including most
Big value and average value), electric-force gradient (including maximum value and average value), field integral, AB segment length, field intensity value be greater than bEm
Path length etc. be used as characteristic quantity；For region feature, the average field intensity on shielding fitting surface is extracted, field intensity value is greater than
b·EmRegion surface product, electric field distortion rate etc. be used as characteristic quantity；For body characteristics, extracts body characteristics shown in FIG. 1 and extract area
Average field intensity, electric field energy, energy density, field intensity value in domain are greater than bEmSpatial volume, electric field distortion rate etc.
As characteristic quantity.Line, face, three dimensions of body characteristic quantity summarize as shown in table 1.
1 high-tension shielding fitting surrounding space field distribution feature set of table
Features described above amount specific formula for calculation is as follows:
Electric field strength, including maximum value EmWith average value Ea:
Em=max (Ei) (i=1,2 ..., n) (1)
In formula, EiThe electric field intensity value for i-th of the data point chosen on region, n are extracted for corresponding line, face, body characteristics
For selected data point sum.
Electric-force gradient in AB section, including maximum value EgmWith average value Ega:
Egm=max (|-gradEi|) (i=1,2 ..., n) (3)
Electric field energy W and energy density Wd:
Wd=W/V (6)
In formula, m is the element number in body characteristics extraction region, ε0For permittivity of vacuum, EiIt is i-th of body unit
Electric field strength, ViIt is the volume of i-th of body unit, V is the total volume that body characteristics extract region.
AB sections of field integral EV:
In formula, diFor the length between adjacent equidistant data point, di=LAB/(n-1)。
Path length, including AB sections of length LAB, field intensity value is greater than bEmPath length Lb:
In formula, p is that field intensity value is greater than bEmData point number.
Region feature extracts field intensity value in region and is greater than bEmRegion surface product Sb:
In formula, q is that field intensity value is greater than bE in region feature extraction regionmFace unit number, SiFor the face of each unit
Product.
Body characteristics extract field intensity value in region and are greater than bEmSpatial volume Vb:
In formula, u is that field intensity value is greater than bE in body characteristics extraction regionmBody unit number, ViFor the body of each unit
Product.
Region feature extracts the electric field distortion rate E in region and body characteristics extraction regionda、Edv, it can be calculate by the following formula:
Ed=Em/Ea (11)
In formula, EmAnd EaThe field strength maximum value and average value being respectively calculated according to formula (1), formula (2).
Two, it is specifically described below by way of examples and with reference to the accompanying drawings with concrete case.
Illustrate a kind of surrounding space field distribution of high-tension shielding fitting according to the present invention by taking high-tension shielding ball as an example
Characterizing method, typical case's shielding ball layout is as shown in Fig. 2, be ball-ground arrangement form, the diameter of ball is 300mm, and the centre of sphere is high over the ground
4m, for pipe mother perpendicular to ground configuration, being correspondingly connected with pipe mother's diameter is 200mm, and connecting tube female end portion configures a ring diameter 1000mm,
The grading ring of caliber 120mm.3D Electric Field Simulation model is established according to actual tests arrangement.Ignore door type frame, high straightening when modeling
The equidistant farther away equipment of test product ball of flow generating apparatus, ball conducting wire are replaced with the smooth bend pipe in surface.Shield ball load 1V electricity
Position, the earth and air boundary load zero potential, and the field distribution under the arrangement, electric field can be calculated by ANSYS software
Simulation result is as shown in Figure 3.
By simulation result it is found that field strength maximum value EmAppear in the end of shielding ball, that is, the starting point of Fig. 1 middle line feature
A makes point A to the straight line of the earth, takes the electric field intensity value in this paths, and finding electric field strength is aEmPoint be point B,
In the present embodiment, coefficient a value is 0.3, and line segment AB is line feature extraction region；Shielding ball electrode surface is that region feature extracts area
Domain；To shield the ball centre of sphere as the centre of sphere, the distance of the shielding ball centre of sphere to point B is that radius makees ball, and the region for removing original shield ball is
Body characteristics extract region.
According to calculated result, when shielding fitting load 1V current potential, electric field strength maximum value appears in shielding ball end,
Value is 5.46V/m, according to calculated result, positional distance A the point 134.75mm, i.e. line segment AB long 134.75mm of point B.Body characteristics mention
The part for taking region is to shield the fitting centre of sphere as the centre of sphere, and radius is that 284.75mm makees ball, subtracts the region of former shielding ball, and face is special
It is the surface for shielding fitting ball electrode that sign, which extracts region,.
Behind the extraction region for determining characteristic quantity, defined characteristic quantity can be calculated by MATLAB software, for ratio class
Characteristic quantity, taking the value of coefficient b is respectively 0.9,0.75 and 0.5 3 value, in this way, in the present embodiment, around high-tension shielding ball
Space electric field distribution characteristics amount totally 21, include 9 line characteristic quantities, 5 region feature amounts and 7 personal feature amounts.Each characteristic quantity
Calculated value it is as shown in table 2.
300mm shields the surrounding space field distribution feature set of fitting ball under 2 balls of table-ground arrangement form
The surrounding space field distribution feature set of the high-tension shielding fitting ball under this kind arrangement has obtained as a result, gathers
In element be above-mentioned 21 characteristic quantities.
It is described above that specific embodiments are merely illustrative of the spirit of the present invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (3)
1. a kind of surrounding space field distribution characterizing method of high-tension shielding fitting, which is characterized in that for shielding fitting, selection
Line, face, three dimensions of body Characteristic Extraction region, respectively
Line feature: to shield fitting electric field strength maximum value EmFor starting point, it is denoted as point A, changes most fast side along electric field strength
To arrival aEmPoint, be denoted as B, AB sections of point be line feature extraction region；Electric field strength, electric field ladder in extraction AB section
Degree, field integral, AB segment length, field intensity value are greater than bEmPath length etc. be used as line characteristic quantity, the electric field strength and electricity
Field gradient includes maximum value and average value；
Region feature: extracting region is entire shielding fitting surface, extracts average field intensity, the field intensity value on shielding fitting surface
Greater than bEmRegion surface product, electric field distortion rate etc. be used as region feature amount；
Body characteristics: centered on shielding fitting, the distance at shielding fitting center to B point is that radius makees ball or shields fitting shape with original
The ring that shape is similar but caliber is bigger shoots off former shielding fitting itself and is formed by the extraction region that area of space is body characteristics；It mentions
The average field intensity in the region, electric field energy, energy density, field intensity value is taken to be greater than bEmSpatial volume, electric field it is abnormal
Variability etc. is used as body characteristics amount.
2. a kind of surrounding space field distribution characterizing method of high-tension shielding fitting according to claim 1, feature exist
In characteristic quantity specific formula for calculation is as follows:
Electric field strength, including maximum value EmWith average value Ea:
Em=max (Ei) (i=1,2 ..., n) (1)
In formula, EiThe electric field intensity value for i-th of the data point chosen on region is extracted for corresponding line, face, body characteristics, n is selected
The data point sum taken；
Electric-force gradient in AB section, including maximum value EgmWith average value Ega:
Egm=max (|-gradEi|) (i=1,2 ..., n) (3)
Electric field energy W and energy density Wd:
Wd=W/V (6)
In formula, m is the element number in body characteristics extraction region, ε0For permittivity of vacuum, EiIt is the electric field of i-th of body unit
Intensity, ViIt is the volume of i-th of body unit, V is the total volume that body characteristics extract region；
AB sections of field integral EV:
In formula, diFor the length between adjacent equidistant data point, di=LAB/(n-1)；
Path length, including AB sections of length LAB, field intensity value is greater than bEmPath length Lb:
In formula, p is that field intensity value is greater than bEmData point number；
Region feature extracts field intensity value in region and is greater than bEmRegion surface product Sb:
In formula, q is that field intensity value is greater than bE in region feature extraction regionmFace unit number, SiFor the area of each unit；
Body characteristics extract field intensity value in region and are greater than bEmSpatial volume Vb:
In formula, u is that field intensity value is greater than bE in body characteristics extraction regionmBody unit number, ViFor the volume of each unit；
Region feature extracts the electric field distortion rate E in region and body characteristics extraction regionda、Edv, it can be calculate by the following formula:
Ed=Em/Ea (11)
In formula, EmAnd EaThe field strength maximum value and average value being respectively calculated according to formula (1), formula (2).
3. a kind of surrounding space field distribution characterizing method of high-tension shielding fitting according to claim 1, feature exist
In the aEmAnd bEmIn a, b be proportionality coefficient；For the value of a between 0.25 and 0.45, value should make B point
Field intensity value is less than the field strength on air ionization layer boundary；Between 0.45 and 0.95, the value of b can be chosen more the value of b simultaneously
A value constitutes multiple characteristic quantities.
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