CN106547953A - A kind of method of acquisition 800kV dc bus metal oxide arrester Potential distributions - Google Patents
A kind of method of acquisition 800kV dc bus metal oxide arrester Potential distributions Download PDFInfo
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- CN106547953A CN106547953A CN201610902342.1A CN201610902342A CN106547953A CN 106547953 A CN106547953 A CN 106547953A CN 201610902342 A CN201610902342 A CN 201610902342A CN 106547953 A CN106547953 A CN 106547953A
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Abstract
The invention discloses a kind of method of acquisition 800kV dc bus metal oxide arrester Potential distributions, Potential distribution during operation normal to metal oxide arrester including (1) is emulated：(1 1) set up the three-dimensional mathematical model of metal oxide arrester Potential distribution；The material properties of (1 2) according to each building block of metal oxide arrester, carry out assignment to resistivity；(1 3) apply to force current potential boundary condition；(2) solution calculating is carried out according to the resistivity after assignment and pressure current potential boundary condition to three-dimensional mathematical model, obtains diverse location resistor disc and be short-circuited or by the Potential distribution of the time of tide.Actual size parameter of the present invention according to each part of spark gap, establish the complete threedimensional model of 800kV dc bus Zinc-Oxide Arresters, the peripheral space of spark gap is simulated using limited big air-shed, the current potential of suspended conductor is processed using the Degree-of-freedom Coupling function in ANSYS, spark gap Potential distribution is accurately calculated while calculation scale is simplified.
Description
Technical field
The invention belongs to UHVDC Arrester status monitoring and failure criterion technical field, more particularly, to one
Plant the method for obtaining 800kV dc bus metal oxide arrester Potential distributions.
Background technology
Without drop point in the middle of ± 800kV extra-high voltage direct-current transmissions, a large amount of electric power direct sendings big load center can be held with conveying
Amount is big, power transmission distance is remote, the advantages of save transmission of electricity stringing corridor.The construction of extra-high voltage DC transmission system, be unable to do without overvoltage
Protection device, and spark gap is the capital equipment of overvoltage protection, is the guarantee of basis that line insulation coordinates and reliability service,
Its insulating properties quality, is directly connected to the stability of extra-high voltage DC transmission system operation.
It is as DC bus arrester is using the parallel connection of resistor disc multicolumn, the labyrinth of multi-section serial, long-term to be subject to normal
The impact of running voltage, various internal overvoltages and lightning surge and outside environmental elements, meeting is gradually aging or deteriorates, and
And scene happen occasionally sealing it is bad caused by spark gap make moist and voltage's distribiuting un-reasonable phenomenon, if do not paid attention to
Security incident will be caused, jeopardizes the safe and stable operation of DC transmission system.
The research of metal current Oxide Arrester Potential distribution, carries out for alternating-current lightning arrestor more, exchange is held
Potential distribution under continuous working voltage is considered as electrostatic field problem, i.e. voltage and is distributed in inverse ratio according to the dielectric constant of each medium, but
It is electric field under DC operating voltage and is unsatisfactory for this rule.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of obtain 800kV dc bus gold
Category Oxide Arrester Potential distribution method, its object is to study 800kV spark gaps failure and it is impaired when Potential distribution
Rule, thus avoids security incident, jeopardizes the technical problem of the safe and stable operation of DC transmission system.
The invention provides a kind of method of acquisition 800kV dc bus metal oxide arrester Potential distributions, including
Following step：
(1) Potential distribution during operation normal to metal oxide arrester is emulated：
(1-1) set up the three-dimensional mathematical model of metal oxide arrester Potential distribution；
(1-2) material properties according to each building block of metal oxide arrester, carry out assignment to resistivity；
(1-3) apply to force current potential boundary condition；
(2) three-dimensional mathematical model is solved according to the resistivity after assignment and the pressure current potential boundary condition
Calculate, obtain diverse location resistor disc and be short-circuited or by the Potential distribution of the time of tide.
Further, the three-dimensional mathematical model is：
In domain
Force current potential
Wherein,For describing the distribution of the steady electric field of metal oxide arrester, γ is material
Resistivity, normal direction of the n for media surface,For the potential value of the outer surface of i-th suspended conductor, const is unknown normal
Number, numbers of the k for suspended conductor (metal parts such as flange, anticorona ring, aluminium backing) in spark gap, γa、γbWithPoint
Not Wei adjacent two media a, b resistivity and surface potential,For current potential for fixed value medium (such as anticorona ring, the earth
Deng) outer surface potential value,It is the potential value given according to practical situation (such as 0V, 824kV etc.).
Further, the assignment of resistivity is as follows：
Further, in step (1-3), the pressure current potential boundary condition is：To the anticorona ring of topmost and
Pressure ring gives continuous running voltage 824kV of spark gap, and the flange, base, ground and infinite point to foot gives 0V.
Further, in step (2), when resistor disc short circuit, the boundary condition on the resistor disc surface of short circuit is：Wherein, γfIt is the resistivity with short-circuit resistance piece adjacent media, n is the method for interface
To,For the surface potential of short-circuit resistance piece, const is unknown constant.
Further, in step (2), when resistor disc receives the glaze layer or electrodeposited coating on the time of tide, resistor disc surface to have one
Fixed hydrophobicity, moisture can condense in its surface, and moisture in the form of the globule as passive medium, and which is in steady electric field fullness in the epigastrium and abdomen
The following Laplace equation of foot and boundary condition：Wherein,
γWaterResistivity of=1000 Ω m for moisture, γwIt is the resistivity with moisture adjacent media；WithRespectively moisture and
Potential value to be asked inside adjacent dielectric, normal direction of the n for interface.
In general, by the contemplated above technical scheme of the present invention compared with prior art, with following beneficial effect
Really：
(1) according to the actual size parameter of each part of spark gap, 800kV dc bus Zinc-Oxide Arresters are set up complete
Threedimensional model, simulates the peripheral space of spark gap with limited big air-shed, is located using the Degree-of-freedom Coupling function in ANSYS
The current potential of reason suspended conductor, so as to, while calculation scale is simplified, accurately be calculated to spark gap Potential distribution.
(2) theory according to steady electric field, when making moist to spark gap diverse location on the basis of original model or be short-circuit
Electric pulse field parameter and boundary condition modify, such that it is able to diverse location, the short circuit of different series connection joint number or by the electricity of the time of tide
Bit distribution carries out accurately calculating analysis, Potential distribution Changing Pattern when studying failure by software emulation, it is to avoid live examination
The complex operations tested.
Description of the drawings
Fig. 1 is the 800kV DC bus arresters entirety threedimensional model schematic diagram of the embodiment of the present invention；
Fig. 2 is the extraneous air domain schematic diagram of the embodiment of the present invention；
Fig. 3 is the resistor disc stress and strain model schematic diagram of the embodiment of the present invention；
Fig. 4 is the air-shed stress and strain model schematic diagram of the embodiment of the present invention；
Fig. 5 is the current potential isopotential map on the MOA axis meridian surfaces of the embodiment of the present invention；
Fig. 6 is the Potential distribution schematic diagram when MOA of the embodiment of the present invention normally runs；
Fig. 7 is that Section of three different short circuit feelings voltages at present of the embodiment of the present invention undertake rate schematic diagram；
Fig. 8 is the resistor disc difference damp degree model schematic of the embodiment of the present invention；Wherein, (a) it is 12 water column moulds
Type, is (b) 24 water column models, (c) is 36 water column models；
Fig. 9 is the Potential distribution schematic diagram of the different sections by the time of tide of the embodiment of the present invention；Wherein, (a) it is that first segment is different
Potential distribution during damp degree, (b) be second section difference damp degree when Potential distribution, be (c) that Section of three difference is made moist
Potential distribution during degree, (d) Potential distribution when being Section of four different damp degree, (e) is Section five difference damp degree
When Potential distribution.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each embodiment
Do not constitute conflict each other can just be mutually combined.
The Simulation Calculation of 800kV dc bus metal oxide arrester Potential distribution proposed by the present invention compensate for
The above is not enough, according to the actual size of spark gap, establishes complete threedimensional model using ANSYS softwares, for different operations
Situation (normal, short circuit or make moist), applies corresponding boundary condition to spark gap model according to the theory of steady electric field, so as to can
To calculate 800kV DC bus arresters in diverse location short circuit or by the Potential distribution rule of the time of tide, be spark gap
Line monitoring provides rationally reliable failure criterion.
Embodiments provide a kind of acquisition 800kV dc bus metal oxide arresters (hereinafter referred to as MOA)
The method of Potential distribution, comprises the steps：
(1) Potential distribution during operation normal to MOA carries out simulation calculation：
(1-1) set up the three-dimensional mathematical model of MOA Potential distributions：
Under long-term DC running voltage, the Leakage Current for flowing through MOA resistor discs is mainly current in resistance property, and now MOA can
To regard that the current potential of each several part inside the network being made up of equivalent resistance, i.e. spark gap is distributed according to resistivity as, therefore
The Potential distribution problem of MOA can be converted into electrostatic field problem to be solved.If usingTo describe which
Distribution, then to solve spark gap potential function in the V of domain be the solution that meets following boundary value problem whole.
Wherein,For describing the distribution of the steady electric field of metal oxide arrester, γ is material
Resistivity, normal direction of the n for media surface,For the potential value of the outer surface of i-th suspended conductor, const is unknown normal
Number, numbers of the k for suspended conductor (metal parts such as flange, anticorona ring, aluminium backing) in spark gap, γa、γbWithPoint
Not Wei adjacent two media a, b resistivity and surface potential,For current potential for fixed value medium (such as anticorona ring, the earth
Deng) outer surface potential value,It is the potential value given according to practical situation (such as 0V, 824kV etc.).
(1-2) parameter assignment.According to the material properties of each building block of M Ο A, resistivity γ in formula (1) is entered
Row assignment, as shown in table 1：
1 each element material attribute of table
| Element title | Resistivity Ω m |
| Air | 1014 |
| Metal flange, pad etc. | 0 |
| Porcelain piece | 2.5×1012 |
| Insulating cylinder, insulating bar | 1013 |
| Zinc oxide resistance sheet | 1012 |
(1-3) apply to force current potential boundary condition.Anticorona ring and grading ring to topmost gives the lasting fortune of spark gap
Row voltage 824kV, the flange, base, ground and infinite point to foot give 0V, just can carry out steady electric field to MOA
Solution.
(2) for diverse location resistor disc is short-circuited or by the Calculation of Potential Distribution of the time of tide, it is only necessary in above-mentioned three-dimensional
On the basis of mathematical model, corresponding modification is made to electric pulse field parameter and boundary condition, concrete grammar is as follows：
(2-1) when resistor disc short circuit, its effect in steady electric field is identical with conductor, it is therefore desirable to by the electricity of short circuit
The boundary condition on resistance piece surface is revised as：
Wherein,For the surface potential of short-circuit resistance piece, γfIt is the resistivity with short-circuit resistance piece adjacent media, n is
The normal direction of interface.Remaining parameter is constant with boundary condition, so as to carry out the current potential simulation calculation during short circuit of MOA diverse locations.
(2-2) when resistor disc receives the time of tide, it is contemplated that the glaze layer or electrodeposited coating on resistor disc surface has certain hydrophobicity, water
Branch condenses in its surface, and moisture in the form of the globule as passive medium, and which meets the following pula of Ah in steady electric field
This equation and boundary condition：
Wherein, γWaterResistivity of=1000 Ω m for moisture, γwIt is the resistivity with moisture adjacent media；With
Respectively potential value to be asked inside moisture and adjacent dielectric, normal direction of the n for interface.Remaining parameter is constant with boundary condition,
So as to carry out current potential simulation calculation of the different sections of MOA by the time of tide.
Method in order to verify a kind of acquisition 1000kV metal oxide arrester Potential distributions that the invention is referred to, uses
ANSYS finite element analysis softwares are carried out to the Potential distribution under different operation conditions come the threedimensional model described in the formula of building (1)
Simulation calculation, and by contrasted with site test results and electrostatic field theory analysis, demonstrate model and simulation result
Correctness.It is embodied as flow process as follows：
(1) threedimensional model, such as Fig. 1 are set up according to each part actual size parameters of MOA, and set up 40000 × 40000 ×
80000 (units：Mm cuboid extraneous air domain), with MOA " bonding " together, make field quantity (current potential, field intensity etc.) its hand over
There is on interface seriality, such as Fig. 2.Then carry out assignment to the resistivity of each several part, and to and to MOA bodies and air zone
Domain carries out tetrahedral grid division, grid example such as Fig. 3 and Fig. 4, and metallic conductor surface potential phase everywhere in steady electric field
Deng, therefore metallic conductor is not involved in grid division, and by the table of the elements such as the flange being made up of metallic conductor, anticorona ring, aluminium backing
Face node potential carries out Degree-of-freedom Coupling.Finally apply boundary condition for threedimensional model, the flange and anticorona ring to topmost is assigned
Continuous running voltage 824kV of spark gap is given, the outer surface of flange, base and air section to foot gives 0V,
Just the solution of steady electric field can be carried out to MOA.
(2) according to the boundary condition arranged in (1), simulation calculation is carried out to the Potential distribution of MOA during normal operation, is kept away
The voltage of current potential isopotential map and each resistor disc on thunder device axis meridian surface undertakes rate, and (MOA five saves unit as shown in Figure 5 and Figure 6 respectively
Part is followed successively by one, two, three, four, five sections from top to bottom, and often save has 60 sheet resistance pieces to connect per post, 5 totally 300, sections, from top to bottom
Number consecutively be 1～300).As can be seen that the order of magnitude of the resistivity and its surrounding medium resistivity due to zinc oxide resistance sheet
Difference is than larger, therefore under direct current continuous running voltage, leakage current is there's almost no in surrounding medium, and resistor disc voltage holds
Load rate is only relevant with the resistivity of itself, i.e., under DC operating voltage, MOA resistor discs voltage undertakes rate and is 1.
(3) according to the theory in (2-1), Section three of resistor disc is selected as object of study, when diverse location, difference
During several resistor disc short circuit, the voltage of failure post undertakes rate, and (voltage of short-circuit resistance piece undertakes rate for 0, in figure as shown in Figure 7
In do not draw).
As seen from Figure 7, the Potential distribution of normal resistance piece remains in that uniformly short-circuit resistance piece number is more, just
Often the voltage of resistor disc undertakes rate and rises more, and the position with short-circuit resistance piece in this section is unrelated.
(4) according to the theory in (2-2), radius is attached to into the resistor disc surface for making moist for the semi-cylindrical water band of 3mm,
As the phantom made moist to MOA single-units.In order to simulate MOA difference damp degree, arrange water band quantity be respectively 12,
24 with 36 (being evenly distributed on resistor disc surface), as shown in Figure 8.Respectively first, second, third and fourth, five sections are set to make moist
State, for different damp degrees, using the water band model of varying number, the simulation result of Potential distribution is as shown in Figure 9.
As can be seen that the resistor disc voltage inside the spark gap section for making moist undertakes rate and diminishes, and resistor disc surface moisture is got over
Many, damp degree is more serious, and it is lower that its voltage undertakes rate.From the angle analysis of electrostatic field, the water column being attached to around resistor disc
Equivalent to shunt capacitance so that the overall equivalent capacity increase of the resistor disc that makes moist, as, in electrostatic field, voltage is according to electric capacity in anti-
Score is matched somebody with somebody, so that the resistor disc voltage at the position that makes moist undertakes rate and diminishes.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not to
The present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. are limited, all should be included
Within protection scope of the present invention.
Claims (6)
1. a kind of method of acquisition 800kV dc bus metal oxide arrester Potential distributions, it is characterised in that including following
Step：
(1) Potential distribution during operation normal to metal oxide arrester is emulated：
(1-1) set up the three-dimensional mathematical model of metal oxide arrester Potential distribution；
(1-2) material properties according to each building block of metal oxide arrester, carry out assignment to resistivity；
(1-3) apply to force current potential boundary condition；
(2) solution meter is carried out to the three-dimensional mathematical model according to the resistivity after assignment and the pressure current potential boundary condition
Calculate, obtain diverse location resistor disc and be short-circuited or by the Potential distribution of the time of tide.
2. the method for claim 1, it is characterised in that the three-dimensional mathematical model is：
Wherein,(x, y, z), for describing the distribution of the steady electric field of metal oxide arrester, γ is the resistance of material
Rate, normal direction of the n for media surface,For the potential value of the outer surface of i-th suspended conductor, const is unknown constant, and k is
The number of suspended conductor, γ in spark gapa、γbWith The resistivity and surface potential of respectively adjacent two media a, b,For current potential for fixed value medium outer surface potential value,It is the potential value given according to practical situation.
3. method as claimed in claim 1 or 2, it is characterised in that the assignment of resistivity is as follows：
4. the method as described in any one of claim 1-3, it is characterised in that in step (1-3), the pressure current potential border
Condition is：Anticorona ring to topmost and grading ring give continuous running voltage 824kV of spark gap, flange to foot,
Base, ground and infinite point give 0V.
5. the method as described in any one of claim 1-4, it is characterised in that in step (2), it is when resistor disc short circuit, short
The boundary condition on the resistor disc surface on road is：Wherein, γfIt is and short-circuit resistance piece phase
The resistivity of adjacent medium, normal direction of the n for interface,For the surface potential of short-circuit resistance piece, const is unknown constant.
6. the method as described in any one of claim 1-4, it is characterised in that in step (2), when resistor disc receives the time of tide, resistor disc table
The glaze layer or electrodeposited coating in face has certain hydrophobicity, and moisture can condense in its surface in the form of the globule, and moisture is used as passive Jie
Matter, which meets following Laplace equation and boundary condition in steady electric field：
Wherein, γWaterResistivity of=1000 Ω m for moisture, γwIt is the resistivity with moisture adjacent media； WithRespectively water
Point and adjacent dielectric inside potential value to be asked, n for interface normal direction.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111044812A (en) * | 2019-11-25 | 2020-04-21 | 国网江苏省电力有限公司电力科学研究院 | Method for estimating electrostatic voltage of grading ring of lightning arrester in transformer substation |
| CN111507034A (en) * | 2020-04-15 | 2020-08-07 | 广东电科院能源技术有限责任公司 | Method and system for calculating time-varying characteristic of lightning arrester temperature field under impact load |
| CN111985075A (en) * | 2020-07-03 | 2020-11-24 | 国网山东省电力公司电力科学研究院 | Temperature distribution calculation method and system suitable for zinc oxide arrester |
| CN112541262A (en) * | 2020-12-07 | 2021-03-23 | 中车青岛四方机车车辆股份有限公司 | Lightning arrester installation position positioning method and system, electronic equipment and storage medium |
| 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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111044812A (en) * | 2019-11-25 | 2020-04-21 | 国网江苏省电力有限公司电力科学研究院 | Method for estimating electrostatic voltage of grading ring of lightning arrester in transformer substation |
| CN111044812B (en) * | 2019-11-25 | 2021-11-09 | 国网江苏省电力有限公司电力科学研究院 | Method for estimating electrostatic voltage of grading ring of lightning arrester in transformer substation |
| CN111507034A (en) * | 2020-04-15 | 2020-08-07 | 广东电科院能源技术有限责任公司 | Method and system for calculating time-varying characteristic of lightning arrester temperature field under impact load |
| CN111507034B (en) * | 2020-04-15 | 2023-05-16 | 南方电网电力科技股份有限公司 | Method and system for calculating time-varying characteristics of lightning arrester temperature field under impact load |
| CN111985075A (en) * | 2020-07-03 | 2020-11-24 | 国网山东省电力公司电力科学研究院 | Temperature distribution calculation method and system suitable for zinc oxide arrester |
| CN111985075B (en) * | 2020-07-03 | 2024-03-26 | 国网山东省电力公司电力科学研究院 | Temperature distribution calculation method and system suitable for zinc oxide lightning arrester |
| CN112541262A (en) * | 2020-12-07 | 2021-03-23 | 中车青岛四方机车车辆股份有限公司 | Lightning arrester installation position positioning method and system, electronic equipment and storage medium |
| CN112541262B (en) * | 2020-12-07 | 2022-11-22 | 中车青岛四方机车车辆股份有限公司 | Lightning arrester installation position positioning method and system, electronic equipment and storage medium |
| 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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