CN107091966A - A kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester - Google Patents
A kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester Download PDFInfo
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- CN107091966A CN107091966A CN201710438892.7A CN201710438892A CN107091966A CN 107091966 A CN107091966 A CN 107091966A CN 201710438892 A CN201710438892 A CN 201710438892A CN 107091966 A CN107091966 A CN 107091966A
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 358
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 179
- 229960001296 zinc oxide Drugs 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 title claims abstract description 20
- DLINORNFHVEIFE-UHFFFAOYSA-N hydrogen peroxide;zinc Chemical compound [Zn].OO DLINORNFHVEIFE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229940105296 zinc peroxide Drugs 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- 230000005684 electric field Effects 0.000 description 13
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005686 electrostatic field Effects 0.000 description 4
- 229910052573 porcelain Inorganic materials 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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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Abstract
The present invention provides a kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester, including：Set up the three-dimensional entity model of Zinc-Oxide Arrester；Grid division；Set the boundary condition of grid property and Zinc-Oxide Arrester three-dimensional entity model, the actual operating voltage of loading Zinc-Oxide Arrester；To Zinc-Oxide Arrester, the current potential of practical operation situation is calculated under actual operating voltage, is obtained the potential value of each zinc oxide resistance sheet of Zinc-Oxide Arrester, is obtained the capacitive leakage current values of zinc oxide resistance sheet；Calculate the resistive leakage current of the dirty zinc peroxide resistor disc of different resistivity；Obtain the relation of resistive leakage current situation of change and ZnO resistors sheet resistivity；Calculate maximum allowable resistive leakage current.Damp degree of the invention by judging the calculating of the zinc oxide lightning arrester block property leakage current rate of change Zinc-Oxide Arrester, can be estimated to the failure situation of Zinc-Oxide Arrester, so as to carry out effective early warning to Zinc-Oxide Arrester.
Description
Technical field
The invention belongs to high voltage electrical apparatus technical field, and in particular to one kind determines that Zinc-Oxide Arrester is maximum allowable and resistive let out
The method of leakage current.
Background technology
Arrester is mainly used in lightning surge or the caused inside of operation that limitation is transmitted by circuit in power system
Overvoltage, it is ensured that the normal operation of system.Zinc-Oxide Arrester is because with excellent nonlinear characteristic, protection feature is good, logical
Current capacity is big, simple in construction there is provided more preferable level of protection and bigger protective margin, has obtained extensive utilization.Although oxygen
Change the zinc arrester material level of production to improve constantly, but power-frequency voltage, overvoltage born and the factor influence such as make moist due to long-term,
Valve block can gradually aging, leakage current increase result in temperature rise, finally trigger power grid accident.
The factor that initiated oxidation zinc arrester breaks down mainly is made moist, short circuit etc., and the accident of making moist accounts for zinc oxide and taken shelter from the thunder
More than the 60% of the total accident rate of device.The change of Zinc oxide lightning arrester operation state is reflected directly in the change of its resistive leakage current
On, the increase and mutation of resistive leakage current are to cause the main cause of surge arrester failure, therefore, the monitoring of resistive leakage current
It is the effective means for examining Zinc-Oxide Arrester failure.
According to the relevant regulations of shocking preventing technology service centre of Liaoning Province, pressure of the numerical value variation more than 10% of electric current will leak out
Quick resistance is determined as the piezo-resistance of failure.It is reacted by tidal excursion by the zinc oxide lightning arrester block property leakage current rate of change
Degree, it is considered to the safety allowance of stable operation and the power system of Zinc-Oxide Arrester, obtain resistive leakage current situation of change with
Zinc-Oxide Arrester makes moist the relation of state, obtains the maximum allowable current in resistance property of Zinc-Oxide Arrester.
The content of the invention
In view of the shortcomings of the prior art, the present invention proposes a kind of determination maximum allowable resistive leakage current of Zinc-Oxide Arrester
Method, conveniently, intuitively obtain the damp degree of the zinc oxide resistance sheet of each in Zinc-Oxide Arrester to reach, it is preferably right
The failure of Zinc-Oxide Arrester carries out the purpose of early warning.
Technical scheme is as follows：
A kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester, comprises the following steps：
Step 1, the three-dimensional entity model for setting up Zinc-Oxide Arrester；
Step 2, the non-metallic component to the three-dimensional entity model of the Zinc-Oxide Arrester of foundation carry out grid division；
The boundary condition of step 3, setting grid property and Zinc-Oxide Arrester three-dimensional entity model, loading zinc oxide is taken shelter from the thunder
The actual operating voltage of device；
Step 4, to Zinc-Oxide Arrester, the current potential of practical operation situation is calculated under actual operating voltage, acquisition
The potential value of each zinc oxide resistance sheet of Zinc-Oxide Arrester, according to the potential difference and zinc oxide resistance sheet at zinc oxide resistance sheet two ends
Capacitance obtain zinc oxide resistance sheet capacitive leakage current values；
The potential drop of step 5, the structure and size according to zinc oxide resistance sheet and zinc oxide resistance sheet upper and lower surfaces,
Calculate the resistive leakage current of the dirty zinc peroxide resistor disc of different resistivity；
Step 6, capacitive leakage current values and resistive leakage current value according to zinc oxide resistance sheet, calculate zinc oxide and take shelter from the thunder
The resistive leakage current rate of change of device, obtains the relation of resistive leakage current situation of change and ZnO resistors sheet resistivity；
Piezo-resistance when step 7, the resistive leakage current rate of change of zinc oxide resistance sheet exceed threshold value is determined as failure
Piezo-resistance, calculate the resistive leakage current when zinc oxide lightning arrester block property leakage current rate of change reaches threshold value, be most
It is big to allow resistive leakage current；
Step 8, the resistive leakage current value size according to the Zinc-Oxide Arrester real-time monitored, judge that zinc oxide is taken shelter from the thunder
The damp degree of device, resistive leakage current value is bigger, and Zinc-Oxide Arrester makes moist more serious.
The step 3, including：
Step 3-1, set relative dielectric constant of the grid property as each element of Zinc-Oxide Arrester；
Step 3-2, the calculating of Zinc-Oxide Arrester current potential is carried out by control of Electric potentials equation；
Step 3-3, the boundary condition for setting Zinc-Oxide Arrester three-dimensional entity model；
The actual operating voltage of step 3-4, loading Zinc-Oxide Arrester.
Using the method for free grid division to the non-metallic component of the three-dimensional entity model of the Zinc-Oxide Arrester of foundation
Grid division is carried out, net is carried out successively according to order from inside to outside to each element of Zinc-Oxide Arrester three-dimensional entity model
Lattice are divided, and same type of element is divided together.
In the step 4, the calculation formula of the capacitive leakage current values of zinc oxide resistance sheet is as follows：
Ii=Ui×Ci×2πf (1)
Wherein, IiThe capacitive leakage current values of i-th zinc oxide resistance sheet, U are flowed through in expressioniRepresent i-th ZnO resistors
The potential difference at piece two ends；CiRepresent the capacitance of i-th zinc oxide resistance sheet；F represents power frequency.
In the step 6, the calculation formula of the resistive leakage current rate of change of zinc oxide resistance sheet is as follows：
Beneficial effect：
The present invention proposes a kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester, and this method makes people
The situation of making moist of the zinc oxide resistance sheet of each in Zinc-Oxide Arrester is more intuitively and easily obtained, and by keeping away zinc oxide
The calculating of the thunder device resistive leakage current rate of change judges the damp degree of Zinc-Oxide Arrester, and preferably zinc oxide can be kept away
The failure situation of thunder device is estimated, so as to carry out effective early warning to Zinc-Oxide Arrester；This method has simple, intuitive, meter
Calculate the evident characteristics such as accuracy is high, data analysis is clear.
Brief description of the drawings
Fig. 1 is the determination method flow of the maximum allowable resistive leakage current of Zinc-Oxide Arrester of an embodiment of the present invention
Figure；
Fig. 2 assembles for the 1000kV power system Zinc-Oxide Arrester general assembly drawings and element of an embodiment of the present invention
Figure, wherein, (a) is general assembly drawing；(b) it is element installation diagram；
1000kV power system Zinc-Oxide Arrester total volume modelings and internal modeling of the Fig. 3 for an embodiment of the present invention
Figure, wherein, (a) is total volume modeling figure；(b) it is internal modeling figure；
Fig. 4 divides figure for each element net of Zinc-Oxide Arrester of an embodiment of the present invention, wherein, (a) is zinc oxide
Resistor disc schematic diagram, (b) is capacitor schematic diagram；(c) it is porcelain overcoat；
Fig. 5 is bent for the zinc oxide lightning arrester block property leakage current rate of change under the different damp degrees of an embodiment of the present invention
Line chart.
Embodiment
An embodiment of the present invention is elaborated below in conjunction with the accompanying drawings.
The method of the maximum allowable resistive leakage current of determination Zinc-Oxide Arrester in the embodiment of the present invention, flow such as Fig. 1
It is shown, comprise the following steps：
Step 1, each component size and actual configuration according to Zinc-Oxide Arrester, are set up using Ansys finite element softwares
The three-dimensional entity model of Zinc-Oxide Arrester；
It is 1000kV power system Zinc-Oxide Arrester general assembly drawings such as shown in Fig. 2 (a)~(b) in the embodiment of the present invention
With element installation diagram；Wherein, zinc oxide resistance sheet is ring-type, and external diameter is 136mm, and internal diameter is 54mm, and thickness is 20mm；Outside insulator
Thickness of the shell is 14mm；Flange is ring-type, and external diameter is 1010mm, and internal diameter is 960mm, and thickness is 110mm；Grading ring is tied to be double-deck
Structure, upper strata grading ring ring footpath is 200mm, and at away from Zinc-Oxide Arrester top 1180mm, lower floor's grading ring ring footpath is
200mm, at away from Zinc-Oxide Arrester top 2300mm；In the embodiment of the present invention, the material object of Zinc-Oxide Arrester is entered
Row is rationally accepted or rejected, and ignores metal nuts, the connecting branch of grading ring and porcelain overcoat cluster parachute, in strict accordance with the reality of Zinc-Oxide Arrester
Thing size carries out the foundation of three-dimensional entity model, is 1000kV power system Zinc-Oxide Arresters shown in such as Fig. 3 (a)~(b)
Total volume modeling and internal modeling figure.
Step 2, the non-metallic component to the three-dimensional entity model of the Zinc-Oxide Arrester of foundation carry out grid division；
In the embodiment of the present invention, using the method for free grid division to the 3D solid mould of the Zinc-Oxide Arrester of foundation
The non-metallic component of type carries out grid division, and Selective type is Solid123 tetrahedral grid, three-dimensional to Zinc-Oxide Arrester
Each element of physical model carries out mesh generation successively according to order from inside to outside, and same type of element is divided together,
The order and sizing grid specifically divided be：
Zinc oxide resistance sheet, the tetrahedral grid length of side is 20mm；Capacitor, the tetrahedral grid length of side is 18mm；Porcelain overcoat,
The tetrahedral grid length of side is 15mm；Air-shed in shell, the tetrahedral grid length of side is 45mm；The outer air-shed of shell, tetrahedral grid side
A length of 800mm；Electric field is not present inside hardware, therefore is zinc oxide shown in such as Fig. 4 (a)~(c) without mesh generation
The nodal community of grid is potential value in the mesh generation figure of each element of arrester, figure；
Step 3, the border for setting in Ansys finite element softwares grid property and Zinc-Oxide Arrester three-dimensional entity model
Condition, the actual operating voltage of loading Zinc-Oxide Arrester；
Step 3-1, set relative dielectric constant of the grid property as each element of Zinc-Oxide Arrester；
In the embodiment of the present invention, Potential distribution numerical computations are come according to electrostatic field under Zinc-Oxide Arrester normal operating conditions
Solve, be described as follows：
Zinc-Oxide Arrester is usually operated under the continuous running voltage of power frequency, and the electric field of Zinc-Oxide Arrester is power frequency system
The electric quasi-static field of system；In power system, the frequency of power frequency electric field is generally 50Hz around transmission line of electricity, and wavelength is about
Transmission line length between 6000km, transformer station typically only has 200km or so；According to the definition of quasi-static field：Electromagnetic wave with
When the time that speed V propagates through the maximum dimension size L of studied electromagnetic system is far smaller than the cycle T of the electromagnetic wave,
Coupling is extremely weak between electric field and magnetic field, the electromagnetic field can be considered as into quasi-static electomagnetic field.To arrester Potential distribution
Calculating in, be related to object full-size be no more than 100m, meet above-mentioned definition, therefore, transmission line of electricity produce power frequency electric
Field can approximately see electric quasi-static field as, i.e.,Wherein B represents magnetic induction intensity, and t represents the time.
Therefore, maxwell equation group is expressed as：
Wherein,For vector differentiating operator, H is magnetic field intensity；B is magnetic induction intensity；D is dielectric displacement；E is electric-field intensity；
J is current density；ρ is charge density；
It is rightDivergence is sought, then is had：
According toElectric field is irrotationality, and electric-field intensity E can be still described with electric scalar potential φ：
Now electric field and magnetic field have been non-coupled；To electric field, while considering the conductance σ and permittivity ε of material
The governing equation of electric quasi-static field be represented by：
For when humorous field, electric scalar potential φ vector representations, formula (4) is changed into：
For the conductor in field domain, such as power transmission line, shaft tower, flange, the earth, its conductance σ orders of magnitude are general with 106
On, relative dielectric constant is then general not over 10, and the ratio between conduction electric current and displacement current are：
Wherein, JcRepresent conduction electric current, JdDisplacement current is represented, ω represents frequency.
As can be seen that electric current is conducted in power frequency system is far longer than displacement current, therefore, ignore Section 2 in (5), then
Its governing equation can be expressed as：
As can be seen that current potential is unequal in conductor, but the difference very little under power frequency, it is generally recognized that the current potential phase in conductor
Together, suspended conductor can be carried out by the processing method in electrostatic field in the calculation；Therefore, formula (7) need not be solved.
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
The σ orders of magnitude are led less than 1012, relative dielectric constant is then general not over 1000, and the ratio between conduction electric current and displacement current are：
Now displacement current then has much larger than conduction electric current：
In electric quasi-static field, ω and ε are considered as constant processing, then formula (9) just can with abbreviation into：
As can be seen here, the calculating of quasi-static electric field follows and the on all four rule of electrostatic field；Therefore, zinc oxide is taken shelter from the thunder
The numerical computations of Potential distribution under device normal operation can be solved according to electrostatic field completely；Consider displacement electricity
Stream, relative dielectric constant is set as the attribute of the grid of computation model, inspection information, the relative dielectric constant tool of each element
Body is as follows：
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 greatly, is set as 3000, the relative dielectric constant of porcelain overcoat is set as 7.6, the phase of air here
1 is set as to dielectric constant.
Step 3-2, in Ansys finite element softwares to the calculating of Zinc-Oxide Arrester current potential by control of Electric potentials equation come
Carry out；
Formula is as follows：
Step 3-3, in Ansys finite element softwares set Zinc-Oxide Arrester three-dimensional entity model boundary condition；
In the embodiment of the present invention, the problem of research of Zinc-Oxide Arrester Electric Field Distribution is 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, it shows potential at some
The value of point is given, in the embodiment of the present invention, and 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, using Coupling Potential
The method of the free degree is handled, that is, thinks that the current potential of each node on its surface is equal, and equal to same to be evaluated；
In the embodiment of the present invention, Zinc-Oxide Arrester works out of doors, and surrounding air domain border is infinitely great, is carrying out electric field
When distribution is calculated, it is Zinc-Oxide Arrester 3D solid that unbounded problem, which is blocked as bounded domain problem, i.e. setup algorithm border,
5 times of model actual size, just can meet the requirement of computational accuracy.
In the embodiment of the present invention, dielectric capacitivity is set at two kinds of dielectric interfaces.
In the embodiment of the present invention, the boundary condition based on setting, the solution for the three-dimensional electric field of Zinc-Oxide Arrester is asked
Topic, its distribution is described with φ=φ (x, y, z), then is changed into meeting the variation of equal value of boundary condition in entirely solution domain
Functional problem：
Wherein, x, y, z is three-dimensional coordinate vector,For the energy functional summation of each subdivision unit；
The actual operating voltage of step 3-4, loading Zinc-Oxide Arrester；
In the embodiment of the present invention, the lasting fortune to applying 638kV at Zinc-Oxide Arrester top flange and grading ring
Row voltage, infinite point is applied at zero potential, i.e. ground connection and is considered as to Zinc-Oxide Arrester base and air-shed boundary；
Step 4, the current potential to Zinc-Oxide Arrester practical operation situation are calculated, and are obtained Zinc-Oxide Arrester and are respectively aoxidized
The potential value of zinc resistor disc, zinc oxide is obtained according to the potential difference at zinc oxide resistance sheet two ends and the capacitance of zinc oxide resistance sheet
The capacitive leakage current values of resistor disc；
In the embodiment of the present invention, electricity of the Ansys finite element softwares to 1000kV power system Zinc-Oxide Arresters is used
Field model is calculated, and is obtained on Zinc-Oxide Arrester the potential value of zinc oxide resistance sheet everywhere, is held according to Zinc-Oxide Arrester
Property leakage current theoretical calculation formula, calculates the capacitive leakage current values for flowing through each zinc oxide resistance sheet；
Formula is as follows：
Ii=Ui×Ci×2πf (1)
Wherein, IiThe capacitive leakage current values of i-th zinc oxide resistance sheet, U are flowed through in expressioniRepresent i-th ZnO resistors
The potential difference at piece two ends；CiRepresent the capacitance of i-th zinc oxide resistance sheet；F represents power frequency 50Hz；
Step 5, the zinc oxide resistance sheet upper and lower surfaces obtained according to the structure and size and calculating of zinc oxide resistance sheet
Potential drop, calculate the resistive leakage current of the dirty zinc peroxide resistor disc of different damp degrees (i.e. different resistivity)；
The resistivity of zinc oxide resistance sheet can react its damp degree, and resistivity is bigger, make moist more serious, assign oxidation
In zinc arrester three-dimensional entity model in the different resistivity of zinc oxide resistance sheet, the embodiment of the present invention, zinc oxide resistance sheet is
Ring-type, external diameter is 136mm, and internal diameter is 54mm, and thickness is 20mm；According to the structure and size and resistivity of zinc oxide resistance sheet,
Utilize resistance calculations formulaWherein R, ρ, l, s are respectively resistance value, resistivity, thickness and the horizontal stroke of zinc oxide resistance sheet
Area of section, calculates the resistance value size of zinc oxide resistance sheet, and according to zinc oxide resistance sheet everywhere on Zinc-Oxide Arrester
Potential value, calculate different damp degrees and flow down the resistive leakage current of zinc peroxide resistor disc.
Step 6, capacitive leakage current values and resistive leakage current value according to zinc oxide resistance sheet, calculate zinc oxide and take shelter from the thunder
The resistive leakage current rate of change of device, obtains resistive leakage current situation of change and Zinc-Oxide Arrester and makes moist state (zinc oxide
Resistance sheet resistivity) relation；
The resistive leakage current rate of change calculation formula of Zinc-Oxide Arrester is as follows：
In the embodiment of the present invention, calculate respectively under the different damp degrees of 1000kV power systems Zinc-Oxide Arrester
The resistance of (ZnO resistors sheet resistivity is respectively 80M Ω .m, 50M Ω .m, 30M Ω m and 20M Ω m) zinc oxide resistance sheet
The property leakage current rate of change, as shown in Figure 5.
Piezo-resistance when step 7, the resistive leakage current rate of change of zinc oxide resistance sheet exceed threshold value is determined as failure
Piezo-resistance, calculate the resistive leakage current when zinc oxide lightning arrester block property leakage current rate of change reaches 10%, be most
It is big to allow resistive leakage current；
According to the relevant regulations of shocking preventing technology service centre of Liaoning Province, pressure of the numerical value variation more than 10% of electric current will leak out
Quick resistance is determined as the piezo-resistance of failure, and zinc oxide resistance sheet is excellent piezoresistive material.
In the embodiment of the present invention, the maximum allowable resistive leakage for obtaining 1000kV power system Zinc-Oxide Arresters is calculated
Electric current is 0.31mA.
The relation of step 8, state of being made moist using resistive leakage current situation of change and Zinc-Oxide Arrester, according to real-time prison
The resistive leakage current value size of the Zinc-Oxide Arrester measured, judges the damp degree of Zinc-Oxide Arrester, resistive leakage electricity
Flow valuve is bigger, Zinc-Oxide Arrester make moist it is more serious, according to calculating the obtained resistive leakage current rate of change and ZnO resistors
Piece failure critical value (i.e. the maximum allowable resistive leakage current of zinc oxide resistance sheet) contrast, can be to Zinc-Oxide Arrester because making moist
Caused failure carries out early warning.
Claims (5)
1. a kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester, it is characterised in that comprise the following steps：
Step 1, the three-dimensional entity model for setting up Zinc-Oxide Arrester；
Step 2, the non-metallic component to the three-dimensional entity model of the Zinc-Oxide Arrester of foundation carry out grid division；
The boundary condition of step 3, setting grid property and Zinc-Oxide Arrester three-dimensional entity model, loading Zinc-Oxide Arrester is real
The operating voltage on border；
Step 4, to Zinc-Oxide Arrester, the current potential of practical operation situation is calculated under actual operating voltage, is obtained and is aoxidized
The potential value of each zinc oxide resistance sheet of zinc arrester, according to the potential difference at zinc oxide resistance sheet two ends and the electricity of zinc oxide resistance sheet
Capacitance obtains the capacitive leakage current values of zinc oxide resistance sheet；
The potential drop of step 5, the structure and size according to zinc oxide resistance sheet and zinc oxide resistance sheet upper and lower surfaces, is calculated
The resistive leakage current of the dirty zinc peroxide resistor disc of different different resistivities；
Step 6, capacitive leakage current values and resistive leakage current value according to zinc oxide resistance sheet, calculate Zinc-Oxide Arrester
The resistive leakage current rate of change, obtains the relation of resistive leakage current situation of change and ZnO resistors sheet resistivity；
Piezo-resistance when step 7, the resistive leakage current rate of change of zinc oxide resistance sheet exceed threshold value is determined as the pressure of failure
Quick resistance, calculates the resistive leakage current when zinc oxide lightning arrester block property leakage current rate of change reaches threshold value, is maximum fair
Perhaps resistive leakage current；
Step 8, the resistive leakage current value size according to the Zinc-Oxide Arrester real-time monitored, judge Zinc-Oxide Arrester
Damp degree, resistive leakage current value is bigger, and Zinc-Oxide Arrester makes moist more serious.
2. according to the method described in claim 1, it is characterised in that the step 3, including：
Step 3-1, set relative dielectric constant of the grid property as each element of Zinc-Oxide Arrester；
Step 3-2, the calculating of Zinc-Oxide Arrester current potential is carried out by control of Electric potentials equation；
Step 3-3, the boundary condition for setting Zinc-Oxide Arrester three-dimensional entity model；
The actual operating voltage of step 3-4, loading Zinc-Oxide Arrester.
3. according to the method described in claim 1, it is characterised in that in the step 2, using the method pair of free grid division
The non-metallic component of the three-dimensional entity model of the Zinc-Oxide Arrester of foundation carries out grid division, three-dimensional to Zinc-Oxide Arrester real
Each element of body Model carries out mesh generation successively according to order from inside to outside, and same type of element is divided together.
4. according to the method described in claim 1, it is characterised in that in the step 4, the capacitive leakage electricity of zinc oxide resistance sheet
The calculation formula of flow valuve is as follows：
Ii=Ui×Ci×2πf (1)
Wherein, IiThe capacitive leakage current values of i-th zinc oxide resistance sheet, U are flowed through in expressioniRepresent i-th zinc oxide resistance sheet two
The potential difference at end；CiRepresent the capacitance of i-th zinc oxide resistance sheet；F represents power frequency.
5. according to the method described in claim 1, it is characterised in that in the step 6, the resistive leakage electricity of zinc oxide resistance sheet
The calculation formula for flowing the rate of change is as follows：
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710438892.7A CN107091966A (en) | 2017-06-12 | 2017-06-12 | A kind of method for determining the maximum allowable resistive leakage current of Zinc-Oxide Arrester |
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| CN113419143A (en) * | 2021-05-24 | 2021-09-21 | 广西大学 | Composite insulation state evaluation method based on finite element method and considering sleeve oil paper insulation non-uniform thermal aging effect |
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