CN106226580A - A kind of determination method of Zinc-Oxide Arrester capacity current - Google Patents
A kind of determination method of Zinc-Oxide Arrester capacity current Download PDFInfo
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- CN106226580A CN106226580A CN201610637621.XA CN201610637621A CN106226580A CN 106226580 A CN106226580 A CN 106226580A CN 201610637621 A CN201610637621 A CN 201610637621A CN 106226580 A CN106226580 A CN 106226580A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
nullThe present invention proposes a kind of determination method of Zinc-Oxide Arrester capacity current，Belong to High-Voltage Electrical Appliances field，The method uses Ansys finite element software to set up the three-dimensional entity model of Zinc-Oxide Arrester，Load the Potential distribution situation obtained in Zinc-Oxide Arrester actual motion，Obtain the potential value of each zinc oxide resistance sheet of Zinc-Oxide Arrester further，Potential difference and the capacitance of zinc oxide resistance sheet according to zinc oxide resistance sheet two ends obtain the capacity current value flowing through zinc oxide resistance sheet，The method is convenient for people to the most convenient、Obtain the capacity current value of each zinc oxide resistance sheet effortlessly，And the calculating of the Potential distribution nonuniformity coefficient by being caused Zinc-Oxide Arrester by stray capacitance judges that Zinc-Oxide Arrester designs whether compliant，Preferably spark gap Potential distribution uniformity coefficient is estimated simultaneously，Thus Zinc-Oxide Arrester is effectively improved；The method has the evident characteristics such as simple, intuitive, counting accuracy is high, data analysis is clear.
Description
Technical field
The invention belongs to High-Voltage Electrical Appliances field, be specifically related to a kind of determination method of Zinc-Oxide Arrester capacity current.
Background technology
Current potential along Y-direction, in electric property designs, be controlled so that it is current potential divides by Zinc-Oxide Arrester
The most uniformly, electric field intensity meets the requirement of design safety value to cloth；In theory, Zinc-Oxide Arrester each under ideal conditions
The voltage that individual resistor disc is undertaken all should be equal to the total voltage that is applied on spark gap divided by the all-in resistance sheet number of spark gap；
But Zinc-Oxide Arrester is in actual moving process, due to the depositing of stray capacitance over the ground of the hardware such as flange, aluminium backing
So that voltage that each resistor disc of spark gap undertakes also differs, and often saves what the top zinc oxide resistance sheet of spark gap undertook
Voltage is typically higher than the voltage that bottom resistance sheet undertakes.
Zinc-Oxide Arrester long-term work is in high-voltage state, and this can cause, and spark gap high voltage end sub-resistance sheet is aging to be added
Hurry up, these resistor discs may result in the voltage that on spark gap, other resistor disc undertakes and increase after losing effect, the like, finally
Reduce the expected service life of Zinc-Oxide Arrester；Therefore, must take in the design on the resistor disc to Zinc-Oxide Arrester
Potential distribution be controlled, make the voltage that undertakes on resistor disc evenly as far as possible.
Capacity current generally according to zinc oxide resistance sheet calculates the voltage's distribiuting under Zinc-Oxide Arrester nominal situation
Coefficient of uniformity, the conventional method obtaining Zinc-Oxide Arrester capacity current at present is optical fiber-current method, zinc oxide resistance sheet it
Between install probe additional, by optical fiber, signal is passed on receiver；This method needs to carry out spark gap dismantling, assembling, and wants
Spark gap is carried out charging test, the human and material resources that waste is many.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of determination method of Zinc-Oxide Arrester capacity current, to reach
To convenient, obtain Zinc-Oxide Arrester flows through the capacity current value of each zinc oxide resistance sheet effortlessly, preferably to lightning-arrest
Device Potential distribution uniformity coefficient is estimated purpose.
A kind of determination method of Zinc-Oxide Arrester capacity current, comprises the following steps:
Step 1, according to each component size of Zinc-Oxide Arrester and actual configuration, use Ansys finite element software to set up
The three-dimensional entity model of Zinc-Oxide Arrester；
Step 2, the non-metallic component of three-dimensional entity model to the Zinc-Oxide Arrester set up carry out grid division；
Step 3, in Ansys finite element software, set grid property and the border of Zinc-Oxide Arrester three-dimensional entity model
Condition, loads the Potential distribution situation obtained in Zinc-Oxide Arrester actual motion；
Step 4, according to the Potential distribution situation in Zinc-Oxide Arrester actual motion, obtain Zinc-Oxide Arrester and respectively aoxidize
The potential value of zinc resistor disc, obtains flow through oxygen according to the potential difference at zinc oxide resistance sheet two ends and the capacitance of zinc oxide resistance sheet
Change the capacity current value of zinc resistor disc；
Step 5, the capacity current value of zinc oxide resistance sheet according to obtaining, the condenser paper average of zinc oxide resistance sheet, oxygen
Change the continuous running voltage of zinc spark gap and the number of the resistor disc of Zinc-Oxide Arrester, it is thus achieved that Zinc-Oxide Arrester stray capacitance
The voltage's distribiuting nonuniformity coefficient caused；
Step 6, judge the voltage's distribiuting nonuniformity coefficient that obtained whether more than setting value, the most then need to replace or
Maintenance Zinc-Oxide Arrester, otherwise, Zinc-Oxide Arrester is qualified.
The non-metallic component to the three-dimensional entity model of the Zinc-Oxide Arrester set up described in step 2 carries out dividing net
Lattice, specific as follows:
The method using free grid division, Selective type is the tetrahedral grid of Solidl23, to Zinc-Oxide Arrester
Each element of model carries out stress and strain model successively according to order from inside to outside, and same type of element divides together.
Setting grid property and Zinc-Oxide Arrester three-dimensional entity model in Ansys finite element software described in step 3
Boundary condition, specific as follows:
Step 3-1, set the grid property dielectric constant as each parts；
Step 3-2, in Ansys finite element software the control of Electric potentials equation of selected Zinc-Oxide Arrester；
Step 3-3, in Ansys finite element software set Zinc-Oxide Arrester three-dimensional entity model boundary condition, tool
Body is: air-shed external boundary, top flange outer face and grading ring outer surface use First Boundary Condition；Different medium material
The contact surface of parts uses second kind boundary condition；At two kinds of dielectric interfaces, dielectric dielectric constant is set；For oxygen
Change electric potential floating conductor present in zinc spark gap, use the mode of coupling degree of freedom to process；
Step 3-4, determine and load the running voltage of Zinc-Oxide Arrester, particularly as follows: add at top flange and grading ring
Carry high potential, at chassis ground, load electronegative potential.
The potential difference according to zinc oxide resistance sheet two ends and the capacitance of zinc oxide resistance sheet described in step 4 obtain and flow through
The capacity current value of zinc oxide resistance sheet；
Formula is as follows:
Ii=Ui×Ci×2πf (1)
Wherein, IiRepresent the capacity current value flowing through i-th zinc oxide resistance sheet, UiRepresent i-th zinc oxide resistance sheet two
The potential difference of end；CiRepresent the capacitance of i-th zinc oxide resistance sheet；F represents power frequency.
Described in step 5 according to obtain the capacity current value of zinc oxide resistance sheet, the capacitor averaging of zinc oxide resistance sheet
The number of the resistor disc of value, the continuous running voltage of Zinc-Oxide Arrester and Zinc-Oxide Arrester, it is thus achieved that Zinc-Oxide Arrester is miscellaneous
The voltage's distribiuting nonuniformity coefficient that spurious capacitance causes, specific as follows:
Formula is as follows:
Wherein, KvRepresent the voltage's distribiuting nonuniformity coefficient that Zinc-Oxide Arrester stray capacitance causes, IiRepresent and flow through i-th
The capacity current value of sheet zinc oxide resistance sheet,Represent the condenser paper average of zinc oxide resistance sheet；UcRepresent Zinc-Oxide Arrester
Continuous running voltage；N represents the number of the resistor disc of Zinc-Oxide Arrester.
The invention have the advantages that
The present invention proposes a kind of determination method of Zinc-Oxide Arrester capacity current, that the method is convenient for people to is the most convenient,
Obtain Zinc-Oxide Arrester flows through the capacity current value of each zinc oxide resistance sheet effortlessly, and by Zinc-Oxide Arrester
The calculating of the Potential distribution nonuniformity coefficient caused by stray capacitance to judge that Zinc-Oxide Arrester designs whether compliant, with
Time can preferably spark gap Potential distribution uniformity coefficient be estimated, thus Zinc-Oxide Arrester is effectively changed
Enter；The method has the evident characteristics such as simple, intuitive, counting accuracy is high, data analysis is clear.
Accompanying drawing explanation
Fig. 1 is the determination method flow diagram of the Zinc-Oxide Arrester capacity current of an embodiment of the present invention；
Fig. 2 is general assembly drawing and the element installation diagram of an embodiment of the present invention, and wherein, figure (a) is general assembly drawing；Figure (b) is
Element installation diagram；
Fig. 3 is total volume modeling of an embodiment of the present invention and internal modeling figure, and wherein, figure (a) is total volume modeling figure；Figure
B () is internal modeling figure；
Fig. 4 is each element net division figure of an embodiment of the present invention, and wherein, figure (a) is zinc oxide resistance sheet signal
Figure, figure (b) is capacitor schematic diagram；Figure (c) is porcelain overcoat；
Fig. 5 is value of calculation and the correlation curve figure of measured value of an embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings an embodiment of the present invention is described further.
In the embodiment of the present invention, the determination method of Zinc-Oxide Arrester capacity current, method flow diagram is as it is shown in figure 1, wrap
Include following steps:
Step 1, according to each component size of Zinc-Oxide Arrester and actual configuration, use Ansys finite element software to set up
The three-dimensional entity model of Zinc-Oxide Arrester；
In the embodiment of the present invention, as in figure 2 it is shown, be 1000kV system Zinc-Oxide Arrester general assembly drawing and element assembling
Figure；Wherein, zinc oxide resistance sheet is ring-type, and external diameter is 136mm, and internal diameter is 54mm, and thickness is 20mm；Insulator outer casing thickness is
14mm；Flange is ring-type, and external diameter is 1010mm, and internal diameter is 960mm, and thickness is 110mm；Grading ring is double-decker, and upper strata is equal
Pressure ring ring footpath is 200mm, is arranged at the 1180mm of Zinc-Oxide Arrester top, and lower floor's grading ring ring footpath is 200mm, installs
At the 2300mm of Zinc-Oxide Arrester top；In the embodiment of the present invention, the material object of Zinc-Oxide Arrester is rationally accepted or rejected,
Ignore metal nuts, the connecting branch of grading ring and porcelain overcoat cluster parachute, carry out in strict accordance with the full size of Zinc-Oxide Arrester
The foundation of model, as it is shown on figure 3, be total volume modeling of 1000kV system Zinc-Oxide Arrester and internal modeling figure；
Step 2, the non-metallic component of three-dimensional entity model to the Zinc-Oxide Arrester set up carry out grid division；
In the embodiment of the present invention, the method using free grid division, Selective type is the tetrahedral grid of Solid123,
Each element of Zinc-Oxide Arrester model is carried out successively according to order from inside to outside stress and strain model, same type of element
Dividing together, the concrete order divided and sizing grid be:
Zinc oxide resistance sheet, the tetrahedral grid length of side is 20mm, capacitor, and the tetrahedral grid length of side is 18mm, porcelain overcoat,
The tetrahedral grid length of side is 15mm, air-shed in shell, and the tetrahedral grid length of side is 45mm, shell outer air territory, tetrahedral grid limit
, there is not electric field inside hardware, therefore do not carry out stress and strain model, as shown in Figure 4, be that Zinc-Oxide Arrester is each in a length of 800mm
The stress and strain model figure of element, in figure, the nodal community of grid is potential value；
Step 3, in Ansys finite element software, set grid property and the border of Zinc-Oxide Arrester three-dimensional entity model
Condition, loads the Potential distribution situation obtained in Zinc-Oxide Arrester actual motion；
Step 3-1, set the grid property dielectric constant as each parts；
In the embodiment of the present invention, under Zinc-Oxide Arrester normal operating conditions, Potential distribution numerical computations is come according to electrostatic field
Solve, be described as follows:
Zinc-Oxide Arrester is operated under the continuous running voltage of power frequency at ordinary times, and the electric field of spark gap is the electricity of power frequency system
Quasi-static field；In power system, around transmission line of electricity, the frequency of power frequency electric field is generally 50Hz, and wavelength is about 6000km, becomes
Transmission line length between power station typically only has about 200km；Definition according to quasi-static field: electromagnetic wave is propagated with speed V
When the time of maximum dimension size L passing through studied electromagnetic system is far smaller than the cycle T of this electromagnetic wave, electric field and magnetic field
Between coupling the most weak, this electromagnetic field can be considered as quasi-static electomagnetic field.In the calculating to spark gap Potential distribution, relate to
And the full-size of object is less than 100m, meeting above-mentioned definition, therefore, the power frequency electric field that transmission line of electricity produces can approximate to be seen
As electricity quasi-static field, i.e.
Therefore, maxwell equation group is expressed as:
Wherein, H is magnetic field intensity；B is magnetic induction；D is dielectric displacement；E is electric field intensity；J is electric current density；ρ is
Charge density；
RightSeek divergence, then have:
According toElectric field E is irrotationality, still can describe electric field E with electric scalar potential φ:
Now electric field and magnetic field have been uncoupled；To electric field, consider conductance σ and the DIELECTRIC CONSTANT ε of material simultaneously
The governing equation of electric quasi-static field be represented by:
Wherein,Represent the function of electric field；
The most humorous field, electric scalar potential φ vector representation, formula (4) becomes:
For the conductor in field domain, such as power transmission line, shaft tower, flange, the earth etc., its conductance σ order of magnitude is typically with 106
On, relative dielectric constant is then general not over 10, and conduction electric current with the ratio of displacement current is:
Wherein, JcRepresent conduction electric current；JdRepresent displacement current；ω represents frequency；
It can be seen that conduct electric current in power frequency system to be far longer than displacement current, therefore, ignore Section 2 in (5), then
Its governing equation can be expressed as:
It can be seen that current potential is unequal in conductor, but difference is the least under power frequency, it is generally recognized that the current potential phase in conductor
With, suspended conductor can be carried out by the processing method in electrostatic field in the calculation；Therefore, formula (7) need not solve；
For the medium in field domain, such as air, its electrical conductivity is approximately considered 0, and insulator, resistor disc, insulating bar etc., its electricity
Lead the σ order of magnitude less than 1012, relative dielectric constant is then general not over 1000, and conduction electric current with the ratio of displacement current is:
Now displacement current is much larger than conduction electric current, then have:
In electricity quasi-static field, ω and ε is considered as constant and processes, then formula (9) just can become with abbreviation:
As can be seen here, the calculating of quasi-static electric field follows rule on all four with electrostatic field；Therefore, zinc oxide is taken shelter from the thunder
The numerical computations of the Potential distribution under device normal operation can solve according to electrostatic field completely；Consider displacement electricity
Stream, is set as the attribute of above-mentioned grid, inspection information by relative dielectric constant, and the relative dielectric constant of each element is concrete such as
Under:
The relative dielectric constant of zinc oxide resistance sheet is set as 650, and the relative dielectric constant of capacitor is set as 5, metal
The relative dielectric constant of material is very big, is set as 3000 here, and the relative dielectric constant of porcelain overcoat is set as 7.6, the phase of air
Dielectric constant is set as 1；
Step 3-2, in Ansys finite element software the control of Electric potentials equation of selected Zinc-Oxide Arrester；
Formula is as follows:
Step 3-3, in Ansys finite element software set Zinc-Oxide Arrester three-dimensional entity model boundary condition；
In the embodiment of the present invention, the research of Zinc-Oxide Arrester Electric Field Distribution is the problem of a finite region, it is considered to the
First-type boundary condition and second kind boundary condition；
First Boundary Condition is also known as imposed boundary con ditions, specific as follows:
φ|Γ1=g (p) (12)
Wherein, g (p) is the generic function of position, can be in particular cases zero or constant, and it shows that electromotive force is at certain
The value of point is given, and in the embodiment of the present invention, air-shed external boundary, top flange outer face and grading ring outer surface use the
First-type boundary condition；
Second kind boundary condition is also known as natural boundary conditions, specific as follows:
Wherein, h (p) is generic function, and n is the export-oriented normal vector on border, can be in particular cases zero or constant,
In the embodiment of the present invention, the contact surface of different medium material components uses second kind boundary condition；
In the embodiment of the present invention, for each electric potential floating conductor of Zinc-Oxide Arrester, use Coupling Potential
The method of degree of freedom processes, and i.e. thinks that the current potential of each node is the most equal on its surface, and equal to same to be evaluated；
In the embodiment of the present invention, Zinc-Oxide Arrester is operated in open air, and border, surrounding air territory is infinitely great, is carrying out electric field
During the research being distributed, unbounded problem is blocked into 5 times that bounded domain problem, i.e. setup algorithm border are model actual size,
Just the requirement of computational accuracy can be met；
In the embodiment of the present invention, at two kinds of dielectric interfaces, dielectric dielectric constant is set；
In the embodiment of the present invention, for the three-dimensional electric field problem of Zinc-Oxide Arrester, if usingIt is described
Distribution, then whole solve territory in meet the Variational Functional problem of equal value of boundary condition and be:
Step 3-4, determine and load the running voltage of Zinc-Oxide Arrester, particularly as follows: add at top flange and grading ring
Carry high potential, at chassis ground, load electronegative potential；
In the embodiment of the present invention, to the lasting fortune applying 638kV at Zinc-Oxide Arrester top flange and grading ring
Row voltage, applies at zero potential, i.e. ground connection Zinc-Oxide Arrester base and air-shed boundary and is considered as infinite point；
Step 4, according to the Potential distribution situation in Zinc-Oxide Arrester actual motion, obtain Zinc-Oxide Arrester and respectively aoxidize
The potential value of zinc resistor disc, obtains flow through oxygen according to the potential difference at zinc oxide resistance sheet two ends and the capacitance of zinc oxide resistance sheet
Change the capacity current value of zinc resistor disc；
In the embodiment of the present invention, use the Ansys finite element software electric field mould to 1000kV system Zinc-Oxide Arrester
Type calculates, and obtains the potential value of zinc oxide resistance sheet everywhere on Zinc-Oxide Arrester, with according to Zinc-Oxide Arrester capacitive electricity
Stream theoretical calculation formula, calculates the capacity current value flowing through each zinc oxide resistance sheet；
Formula is as follows:
Ii=Ui×Ci×2πf (1)
Wherein, IiRepresent the capacity current value flowing through i-th zinc oxide resistance sheet, UiRepresent i-th zinc oxide resistance sheet two
The potential difference of end；CiRepresent the capacitance of i-th zinc oxide resistance sheet；F represents power frequency 50Hz；
In the embodiment of the present invention, by using the means of computer software, it is determined that 1000kV system zinc oxide is taken shelter from the thunder
The capacity current value of device, and 1000kV system Zinc-Oxide Arrester has been carried out charging test, use optical fiber-current method to measure
Having obtained the capacity current value of part zinc oxide resistance sheet in upper two joint spark gaps, often joint spark gap has taken 9 measuring points respectively, will
Value of calculation contrasts with measured value, as it is shown in figure 5,1000kV system with the value of calculation of Zinc-Oxide Arrester capacity current value and
Measurement variation trend is close, and maximum error is 0.08mA, demonstrates and determines the reliable of Zinc-Oxide Arrester capacity current method
Property and accuracy；
Step 5, the capacity current value of zinc oxide resistance sheet according to obtaining, the condenser paper average of zinc oxide resistance sheet, oxygen
Change the continuous running voltage of zinc spark gap and the number of the resistor disc of Zinc-Oxide Arrester, it is thus achieved that Zinc-Oxide Arrester stray capacitance
The voltage's distribiuting nonuniformity coefficient caused；
Computing formula is as follows:
Wherein, KvRepresent the voltage's distribiuting nonuniformity coefficient that Zinc-Oxide Arrester stray capacitance causes, UiRepresent i-th oxygen
Change the potential difference at zinc resistor disc two ends；CiIt it is the capacitance of i-th zinc oxide resistance sheet；Represent the electric capacity of zinc oxide resistance sheet
Meansigma methods；UcRepresent the continuous running voltage of Zinc-Oxide Arrester；N represents the number of the resistor disc of Zinc-Oxide Arrester；
Wherein, IiRepresent the capacity current value flowing through i-th zinc oxide resistance sheet；
Step 6, judge the voltage's distribiuting nonuniformity coefficient that obtained whether more than setting value, the most then need to replace or
Maintenance Zinc-Oxide Arrester, otherwise, Zinc-Oxide Arrester is qualified.
In the embodiment of the present invention, flow through the capacity current maximum I of zinc oxide resistance sheeti(max)For 2.80mA, zinc oxide electricity
The condenser paper average of resistance sheet is 2.88nF, and continuous running voltage is 638kV, and resistor disc number is 212, calculates
The voltage's distribiuting nonuniformity coefficient that the stray capacitance of 1000kV system Zinc-Oxide Arrester causes is 0.029；Kv=0,029 symbol
Close 1000kV system uneven with the spark gap voltage's distribiuting of band equalizing capacitance in porcelain-clad metal oxide lightning arrester technical specification
Even coefficient not should be greater than the requirement of 0.15.
Claims (5)
1. the determination method of a Zinc-Oxide Arrester capacity current, it is characterised in that comprise the following steps:
Step 1, according to each component size of Zinc-Oxide Arrester and actual configuration, use Ansys finite element software to set up oxidation
The three-dimensional entity model of zinc spark gap；
Step 2, the non-metallic component of three-dimensional entity model to the Zinc-Oxide Arrester set up carry out grid division；
Step 3, in Ansys finite element software, set grid property and the perimeter strip of Zinc-Oxide Arrester three-dimensional entity model
Part, loads the Potential distribution situation obtained in Zinc-Oxide Arrester actual motion；
Step 4, according to the Potential distribution situation in Zinc-Oxide Arrester actual motion, obtain Zinc-Oxide Arrester each zinc oxide electricity
The potential value of resistance sheet, obtains flow through zinc oxide according to the potential difference at zinc oxide resistance sheet two ends and the capacitance of zinc oxide resistance sheet
The capacity current value of resistor disc；
Step 5, the capacity current value of zinc oxide resistance sheet according to obtaining, the condenser paper average of zinc oxide resistance sheet, zinc oxide
The continuous running voltage of spark gap and the number of the resistor disc of Zinc-Oxide Arrester, it is thus achieved that Zinc-Oxide Arrester stray capacitance causes
Voltage's distribiuting nonuniformity coefficient；
Whether the voltage's distribiuting nonuniformity coefficient that step 6, judgement are obtained more than setting value, the most then needs to replace or maintenance
Zinc-Oxide Arrester, otherwise, Zinc-Oxide Arrester is qualified.
The determination method of Zinc-Oxide Arrester capacity current the most according to claim 1, it is characterised in that described in step 2
The non-metallic component of three-dimensional entity model to the Zinc-Oxide Arrester set up carry out grid division, specific as follows:
The method using free grid division, Selective type is the tetrahedral grid of Solid123, to Zinc-Oxide Arrester model
Each element carry out stress and strain model successively according to order from inside to outside, same type of element divides together.
The determination method of Zinc-Oxide Arrester capacity current the most according to claim 1, it is characterised in that described in step 3
In Ansys finite element software, set grid property and the boundary condition of Zinc-Oxide Arrester three-dimensional entity model, the most such as
Under:
Step 3-1, set the grid property dielectric constant as each parts；
Step 3-2, in Ansys finite element software the control of Electric potentials equation of selected Zinc-Oxide Arrester；
Step 3-3, in Ansys finite element software set Zinc-Oxide Arrester three-dimensional entity model boundary condition, particularly as follows:
Air-shed external boundary, top flange outer face and grading ring outer surface use First Boundary Condition；Different medium material components
Contact surface use second kind boundary condition；At two kinds of dielectric interfaces, dielectric dielectric constant is set；For zinc oxide
Electric potential floating conductor present in spark gap, uses the mode of coupling degree of freedom to process；
Step 3-4, determine and load the running voltage of Zinc-Oxide Arrester, particularly as follows: load height at top flange and grading ring
Current potential, loads electronegative potential at chassis ground.
The determination method of Zinc-Oxide Arrester capacity current the most according to claim 1, it is characterised in that described in step 4
The potential difference according to zinc oxide resistance sheet two ends and the capacitance of zinc oxide resistance sheet obtain and flow through the appearance of zinc oxide resistance sheet
Property current value；
Formula is as follows:
Ii=Ui×Ci×2πf (1)
Wherein, IiRepresent the capacity current value flowing through i-th zinc oxide resistance sheet, UiRepresent i-th zinc oxide resistance sheet two ends
Potential difference；CiRepresent the capacitance of i-th zinc oxide resistance sheet；F represents power frequency.
The determination method of Zinc-Oxide Arrester capacity current the most according to claim 1, it is characterised in that described in step 5
According to the capacity current value of zinc oxide resistance sheet obtained, the condenser paper average of zinc oxide resistance sheet, Zinc-Oxide Arrester
The number of the resistor disc of continuous running voltage and Zinc-Oxide Arrester, it is thus achieved that the voltage that Zinc-Oxide Arrester stray capacitance causes divides
Cloth nonuniformity coefficient, specific as follows:
Formula is as follows:
Wherein, KvRepresent the voltage's distribiuting nonuniformity coefficient that Zinc-Oxide Arrester stray capacitance causes, IiRepresent and flow through i-th oxygen
Change the capacity current value of zinc resistor disc,Represent the condenser paper average of zinc oxide resistance sheet；UcRepresent holding of Zinc-Oxide Arrester
Continuous working voltage；N represents the number of the resistor disc of Zinc-Oxide Arrester.
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Cited By (5)
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| CN107091966A (en) * | 2017-06-12 | 2017-08-25 | 国网辽宁省电力有限公司电力科学研究院 | A kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester |
| CN107727993A (en) * | 2017-11-14 | 2018-02-23 | 国网辽宁省电力有限公司电力科学研究院 | The detection means and detection method of DC zinc oxide lighting arrester valve block damp degree |
| CN111597697A (en) * | 2020-05-08 | 2020-08-28 | 国网山东省电力公司电力科学研究院 | Extra-high voltage same-tower double-circuit line arrester arrangement optimization method |
| CN112072687A (en) * | 2020-08-24 | 2020-12-11 | 华南理工大学 | Method for determining stray capacitance value of alternating current filter |
| CN112864808A (en) * | 2020-12-31 | 2021-05-28 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for optimizing potential distribution of lightning arrester by changing arrangement mode of voltage-sharing capacitors |
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| CN107727993A (en) * | 2017-11-14 | 2018-02-23 | 国网辽宁省电力有限公司电力科学研究院 | The detection means and detection method of DC zinc oxide lighting arrester valve block damp degree |
| CN111597697A (en) * | 2020-05-08 | 2020-08-28 | 国网山东省电力公司电力科学研究院 | Extra-high voltage same-tower double-circuit line arrester arrangement optimization method |
| CN111597697B (en) * | 2020-05-08 | 2024-02-02 | 国网山东省电力公司电力科学研究院 | Arrangement optimization method for extra-high voltage same-tower double-circuit line lightning arresters |
| CN112072687A (en) * | 2020-08-24 | 2020-12-11 | 华南理工大学 | Method for determining stray capacitance value of alternating current filter |
| CN112072687B (en) * | 2020-08-24 | 2022-01-18 | 华南理工大学 | Method for determining stray capacitance value of alternating current filter |
| CN112864808A (en) * | 2020-12-31 | 2021-05-28 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for optimizing potential distribution of lightning arrester by changing arrangement mode of voltage-sharing capacitors |
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