CN108984944A - A kind of choosing method and device of bushing shell for transformer full skirt parameter - Google Patents

A kind of choosing method and device of bushing shell for transformer full skirt parameter Download PDF

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CN108984944A
CN108984944A CN201810873443.XA CN201810873443A CN108984944A CN 108984944 A CN108984944 A CN 108984944A CN 201810873443 A CN201810873443 A CN 201810873443A CN 108984944 A CN108984944 A CN 108984944A
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umbrella
electric field
field intensity
path
modification
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CN108984944B (en
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廖帆
廖一帆
张福增
郝艳捧
阳林
姚瑶
谭傲
王婷婷
曾向君
徐永生
肖微
毛桂云
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China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
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  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)
  • Insulating Bodies (AREA)

Abstract

The invention discloses a kind of choosing methods of bushing shell for transformer full skirt parameter, which comprises the steps of: establishes the benchmark model of bushing shell for transformer；Establish modification model group；Simulation calculation is carried out to modification model group, the air gap path electric field strength and different umbrellas that obtain the full skirt of different umbrella pitch modification models stretch out the creepage path electric field strength of the full skirt of modification model；Umbrella spacing value range is chosen according to the air gap path electric field strength of full skirt under different umbrella pitch modification models；Umbrella, which is chosen, according to the creepage path electric field strength that different umbrellas stretch out full skirt under modification model stretches out value range；Bushing shell for transformer full skirt parameter is determined according to value range.The choosing method of bushing shell for transformer full skirt parameter disclosed by the invention can effectively solve calculating process complexity when the prior art determines full skirt parameter, and experimentation cost is high, test the problem of time-consuming.The embodiment of the invention also discloses a kind of selecting devices of bushing shell for transformer full skirt parameter.

Description

Method and device for selecting parameters of umbrella skirt of transformer bushing
Technical Field
The invention relates to the technical field of power transmission, in particular to a method and a device for selecting parameters of a transformer bushing shed.
Background
The heavy rainfall weather in the south of China in a wide range becomes a main influence factor for stable and reliable operation of external insulation equipment. In recent years, a great deal of research on the problem of rain flashover of composite post insulators and line insulators is carried out, and the rain flashover characteristic of external insulation equipment for a direct-current system is analyzed through flashover voltage obtained through a manual rain test, so that the rain flashover characteristic of the external insulation equipment can be effectively improved by optimizing parameters of an external insulation umbrella skirt.
In the prior art, the algorithm for determining the parameters of the umbrella skirt comprises the following steps: and establishing a simulation model of the umbrella skirt, carrying out simulation calculation on the simulation model, and processing a simulation calculation result through an orthogonal test table to obtain the value of the umbrella space in the N groups of umbrella skirt parameters.
The inventor finds that the following technical problems exist in the prior art in the process of implementing the invention:
the umbrella spacing is determined through an orthogonal test table, and the calculation process is complex; the parameters of the umbrella skirt are limited only by the distance between the umbrella skirts, and the influence of other parameters of the umbrella skirt on the umbrella skirt cannot be eliminated; the simulation method can only calculate the value of the umbrella space in the umbrella skirt parameters, and the determination of other parameters can only pass a large amount of manual rain tests on the transformer porcelain sleeve, so the test cost is high, and the test time is long.
Disclosure of Invention
The embodiment of the invention provides a method and a device for selecting parameters of a transformer bushing shed, which can effectively solve the problems of complex calculation process, high test cost and long test time consumption in the prior art when the parameters of the shed are determined.
The embodiment of the invention provides a method for selecting parameters of a transformer bushing shed, which comprises the following steps:
establishing a reference model of the transformer bushing;
establishing an umbrella spacing modification model group and an umbrella extension modification model group according to a reference model of a transformer bushing;
carrying out simulation calculation on the umbrella spacing modification model group to obtain the electric field intensity of air gap paths of the umbrella skirts under different umbrella spacing modification models in the umbrella spacing modification model group;
carrying out simulation calculation on the umbrella extension modification model group to obtain the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
selecting an umbrella spacing value range according to the electric field intensity of the air gap path of the umbrella skirt under different umbrella spacing modification models in the umbrella spacing modification model group;
selecting an umbrella extension value range according to the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
and determining the value range of the transformer bushing shed parameters according to the value range of the umbrella space and the value range of the umbrella extension, and selecting the transformer bushing shed parameters from the value range of the transformer bushing shed parameters.
As an improvement of the above scheme, the specific method for establishing the reference model of the transformer bushing is as follows:
establishing a full-size reference model of the transformer bushing;
the reference model comprises an umbrella skirt, wherein the umbrella skirt at least comprises a small umbrella and two large umbrellas which are adjacent to each other left and right.
As an improvement of the above scheme, a specific method for establishing the umbrella spacing modification model group and the umbrella extension modification model group according to the reference model of the transformer bushing is as follows:
the method comprises the steps of adopting a variable control method, controlling the dry arc distance, the umbrella extension difference and the inclination angle to be unchanged, changing the umbrella spacing of a transformer bushing, and establishing an umbrella spacing modification model group;
the umbrella space modification model group comprises umbrella space modification models under the umbrella spaces of a plurality of different transformer bushings;
the method comprises the steps of adopting a variable control method, controlling the dry arc distance, the umbrella spacing, the umbrella extension difference and the inclination angle to be unchanged, changing the umbrella extension of a transformer bushing, and establishing an umbrella extension modification model group;
the umbrella extension modification model group comprises umbrella extension modification models under umbrella extension of a plurality of different transformer bushings.
As an improvement of the above scheme, the range of the spacing between the umbrellas of the reference model and the modified model group is 50 mm-100 mm; the extending range of the umbrella is 80 mm-110 mm; the spread of the umbrella is 15 mm-25 mm; the range of the inclination angle of the umbrella skirt is 5-20 degrees.
As an improvement of the above scheme, the specific method for obtaining the electric field intensity of the air gap path of the shed under different umbrella space modification models in the umbrella space modification model group by performing simulation calculation on the umbrella space modification model group is as follows:
respectively carrying out 50Hz frequency domain simulation calculation on the reference model and the umbrella space modification model group to obtain the electric field intensity of the air domain around the sleeve umbrella skirt of the reference model and each umbrella space modification model;
by the following formula (1):
respectively calculating derivative values of the electric field intensity of the surrounding air domain of the sleeve umbrella skirt of each umbrella spacing modification model to obtain the air gap path electric field intensity E corresponding to l1, l2 and l3 under each umbrella spacing modification modell1、El2 and El3；
Taking one small umbrella in an umbrella skirt as a middle umbrella, wherein two large umbrellas adjacent to each other on the left and right sides of the middle umbrella are respectively a first adjacent umbrella and a second adjacent umbrella, l1 is the shortest air gap path from the top end of the first adjacent umbrella to the top end of the middle umbrella, l2 is the shortest air gap path from the top end of the second adjacent umbrella to the top end of the middle umbrella, and l3 is the shortest air gap path from the top end of the first adjacent umbrella to the top end of the second adjacent umbrella;
in equation (1), E is the air gap path electric field strength, L is the air gap path, and s is the path arc length.
As an improvement of the above scheme, the specific method for obtaining the electric field intensity along the planar path of the shed under different umbrella extension modification models in the umbrella extension modification model group by calculating the umbrella extension modification model group is as follows:
respectively carrying out 50Hz frequency domain simulation calculation on the reference model and the umbrella extension modification model group to obtain the electric field intensity of the surface of the sleeve umbrella skirt of each reference model and each umbrella extension modification model;
by the following formula (2):
calculating derivative values of the surface electric field intensity of the sleeve umbrella skirt of the umbrella extension modification model to obtain the reference model and l of each umbrella extension modification model1’、l2’、…、ln' corresponding creeping path electric field intensity El1’、El2’、…、Eln’；
wherein ,l1’、l2’、…、ln' A1 st umbrella tip to a 2 nd umbrella tip, a 2 nd umbrella tip to a 3 rd umbrella tip, …, an nth umbrella tip to an n +1 th umbrella tip, respectively; the 1 st umbrella, the 2 nd umbrella, the … th umbrella and the nth umbrella are sequentially arranged on the structure;
in the formula (2), E ' is the electric field intensity of the planar path, L ' is the planar path, and s ' is the path arc length.
As an improvement of the above scheme, the specific step of selecting the umbrella spacing value range according to the electric field intensity of the air gap path of the umbrella skirt under different umbrella spacing modification models in the umbrella spacing modification model group is as follows:
the air gap path electric field intensity E is calculated according to the following formula (3)l1、El2 and El3Average value of Eair：
Eair＝(El1+El2+El3)/3 (3)
Taking the air gap path electric field intensity El1、El2 and El3Maximum value of E asmaxMinimum value as Emin；
The relative pole difference Δ air of the air gap path electric field strength is calculated according to the following equation (4):
Δair＝(Emax-Emin)/Eair(4)
respectively obtaining the average value of the electric field intensity of the air gap path of different umbrella space modification models and the relative extreme difference of the electric field intensity of the air gap path by adopting the formula (3) and the formula (4);
respectively drawing a coordinate curve of the average value of the electric field intensity of the air gap path and a coordinate curve of the relative polar difference of the electric field intensity of the air gap path in the same coordinate system, taking the intersection point of the coordinate curve of the average value of the electric field intensity of the air gap path and the coordinate curve of the relative polar difference of the electric field intensity of the air gap path as an optional range end point, and setting the average value of the electric field intensity of the air gap path corresponding to the optional range end point as Eair1；
Selecting the average value of the electric field intensity of the air gap path on a coordinate curve of the average value of the electric field intensity of the air gap path not more than Eair1The set of all points of (a) is taken as the umbrella spacing value range.
As an improvement of the above scheme, the specific step of selecting the umbrella extension value range according to the electric field intensity of the edgewise path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group is as follows:
the average value E of the electric field intensity along the surface path is calculated according to the following formula (5)surf：
Esurf＝(El1’+El2’+…+Eln’)/n (5)
Taking the electric field intensity E of the creeping pathl1’、El2’、…、ElnMaximum value in' as Emax', minimum value as Emin’；
The relative pole difference Δ surf of the electric field intensity along the planar path is calculated according to the following equation (6):
Δsurf＝(Emax’-Emin’)/Esurf(6)
respectively obtaining the average value of the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models and the relative range of the electric field intensity of the surface path by adopting the formula (5) and the formula (6);
respectively drawing a coordinate curve of the average value of the electric field intensity of the creeping path and a coordinate curve of the relative range of the electric field intensity of the creeping path in the same coordinate system, taking the intersection point of the coordinate curve of the average value of the electric field intensity of the creeping path and the coordinate curve of the relative range of the electric field intensity of the creeping path as an optional range end point, and setting the average value of the electric field intensity of the creeping path corresponding to the optional range end point as Esurf1；
Selecting the mean value of the electric field intensity of the creeping path on the coordinate curve of the mean value of the electric field intensity of the creeping path not more than Esurf1The set of all points of (a) is taken as the umbrella extension value range.
The embodiment of the invention correspondingly provides a device for selecting parameters of a transformer bushing shed, which is characterized by comprising the following components:
the modeling module is used for establishing a reference model of the transformer bushing; establishing an umbrella spacing modification model group and an umbrella extension modification model group according to a reference model of a transformer bushing;
the calculation module is used for calculating the umbrella space modification model group to obtain the electric field intensity of the air gap path of the umbrella skirt under different umbrella space modification models in the umbrella space modification model group;
calculating an umbrella extension modification model group to obtain the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
the selection module selects an umbrella spacing value range according to the electric field intensity of air gap paths of umbrella skirts under different umbrella spacing modification models in the umbrella spacing modification model group;
selecting an umbrella extension value range according to the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
and determining the value range of the transformer bushing shed parameters according to the value range of the umbrella space and the value range of the umbrella extension, and selecting the transformer bushing shed parameters from the value range of the transformer bushing shed parameters.
Compared with the prior art, the method and the device for selecting the parameters of the umbrella skirt of the transformer bushing have the following beneficial effects that:
the method comprises the steps that the umbrella distance parameter value range and the umbrella extension parameter value range of an umbrella skirt are obtained through modeling and simulation calculation of the umbrella skirt, the value of the transformer bushing umbrella skirt parameter is determined according to the umbrella distance parameter value range and the umbrella extension parameter value range of the umbrella skirt, the value of the transformer bushing umbrella skirt parameter is limited in terms of umbrella distance and umbrella extension, and the value of the transformer bushing umbrella skirt parameter is enabled to be more excellent; the method has the advantages that the influence of other variables on a simulation calculation result can be eliminated by controlling the variable method to carry out the modeling of the correction model on the shed, the stability of the simulation calculation result is improved, and the problems of high test cost and long test time consumption caused by carrying out a large number of artificial rain tests on the porcelain sleeve of the transformer are solved; the umbrella skirt parameters are limited through relative range, and the accuracy of the umbrella skirt parameter selection range is further improved.
Drawings
Fig. 1 is a schematic flow chart of a method for selecting parameters of a transformer bushing shed according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a reference model of a method for selecting parameters of a transformer bushing shed according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a reference model and a shed of a modification model of a method for selecting parameters of a transformer bushing shed according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a coordinate curve of an average value of electric field intensities of air gap paths and a coordinate curve of a relative difference of the electric field intensities of the air gap paths in a method for selecting parameters of a shed of a transformer bushing according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a coordinate curve of an average value of an electric field intensity of a creeping path and a coordinate curve of a relative range of the electric field intensity of the creeping path according to a method for selecting parameters of a transformer bushing shed provided in an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a device for selecting parameters of a transformer bushing shed according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, which is a schematic flow chart of a method for selecting parameters of a transformer bushing shed according to an embodiment of the present invention, the method includes the following steps:
s1, establishing a reference model of the transformer bushing;
the specific method for establishing the reference model of the transformer bushing comprises the following steps:
establishing a full-size reference model of the transformer bushing; the reference model comprises an umbrella skirt, and the umbrella skirt at least comprises a small umbrella and two large umbrellas which are adjacent to each other left and right.
Preferably, the reference model further comprises a voltage-sharing cover, a conducting rod, a transformer oil tank, an umbrella skirt, oil-impregnated paper, a flange and a voltage-sharing ball.
Fig. 2 is a schematic structural diagram of a reference model of a method for selecting transformer bushing shed parameters according to an embodiment of the present invention.
S2, establishing an umbrella spacing modification model group and an umbrella extension modification model group according to the reference model of the transformer bushing;
the specific method for establishing the umbrella spacing modification model group and the umbrella extension modification model group according to the reference model of the transformer bushing comprises the following steps:
the method comprises the steps of adopting a variable control method, controlling the dry arc distance, the umbrella extension difference and the inclination angle to be unchanged, changing the umbrella spacing of a transformer bushing, and establishing an umbrella spacing modification model group; the umbrella spacing modification model group comprises umbrella spacing modification models under umbrella spacing of a plurality of different transformer bushings.
The method comprises the steps of adopting a variable control method, controlling the dry arc distance, the umbrella spacing, the umbrella extension difference and the inclination angle to be unchanged, changing the umbrella extension of a transformer bushing, and establishing an umbrella extension modification model group; the umbrella extension modification model group includes umbrella extension-under umbrella extension modification models of a plurality of different transformer bushings.
Preferably, part 2 is determined according to the selection and size of high-voltage insulators used under GBT 26218.2-2010 pollution conditions: the umbrella spacing value range is 50-100 mm under the application conditions of porcelain and glass insulators for alternating current systems and transformer bushings; the extending range of the umbrella is 80 mm-110 mm; the spread of the umbrella is 15 mm-25 mm; the range of the inclination angle of the umbrella skirt is 5-20 degrees.
Preferably, the umbrella spacing of 80mm can be selected as an umbrella spacing parameter value of the reference model, and under the condition of controlling the dry arc distance, the umbrella extension difference and the inclination angle to be unchanged, the umbrella spacing of 50mm, 70mm, 90mm and 100mm can be selected to establish an umbrella spacing modification model group.
Preferably, the umbrella spacing of 95mm can be selected as an umbrella spacing parameter value of the reference model, and under the condition of controlling the dry arc distance, the umbrella spacing, the umbrella extension difference and the inclination angle to be unchanged, the umbrella extension of 80mm, 85mm, 100mm and 110mm can be selected to establish an umbrella extension modification model group.
S3, carrying out simulation calculation on the umbrella space modification model group to obtain the electric field intensity of the air gap path of the umbrella skirt under different umbrella space modification models in the umbrella space modification model group;
the specific method comprises the following steps:
respectively carrying out 50Hz frequency domain simulation calculation on the reference model and the umbrella space modification model group to obtain the electric field intensity of the air domain around the sleeve umbrella skirt of the reference model and each umbrella space modification model;
by the following formula (1):
respectively calculating derivative values of the electric field intensity of the surrounding air domain of the sleeve umbrella skirt of each umbrella spacing modification model to obtain the air gap path electric field intensity E corresponding to l1, l2 and l3 under each umbrella spacing modification modell1、El2 and El3；
Fig. 3 is a schematic structural diagram of a reference model and a shed of a modification model of a method for selecting parameters of a transformer bushing shed according to an embodiment of the present invention. Taking a small umbrella in an umbrella skirt as a middle umbrella, wherein two large umbrellas adjacent to each other on the left and right sides of the middle umbrella are respectively a first adjacent umbrella and a second adjacent umbrella, l1 is the shortest air gap path from the top end of the first adjacent umbrella to the top end of the middle umbrella, l2 is the shortest air gap path from the top end of the second adjacent umbrella to the top end of the middle umbrella, and l3 is the shortest air gap path from the top end of the first adjacent umbrella to the top end of the second adjacent umbrella;
in equation (1), E is the air gap path electric field strength, L is the air gap path, and s is the path arc length.
Preferably, the conducting rod and the innermost capacitor layer are loaded with 318kV voltage, the flange, the oil tank and the outermost capacitor layer are grounded, and finite element simulation software CommollMultiphysics is used for carrying out 50Hz frequency domain simulation calculation on the sleeve model.
S4, carrying out simulation calculation on the umbrella extension modification model group to obtain the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
the specific method comprises the following steps:
respectively carrying out 50Hz frequency domain simulation calculation on the reference model and the umbrella extension modification model group to obtain the electric field intensity of the surface of the sleeve umbrella skirt of the reference model and each umbrella extension modification model;
by the following formula (2):
calculating derivative values of the surface electric field intensity of a sleeve umbrella skirt of the umbrella extension modification model to obtain a reference model and l of each umbrella extension modification model1’、l2’、…、ln' corresponding creeping path electric field intensity El1’、El2’、…、Eln’；
Fig. 3 is a schematic structural diagram of a reference model and a shed of a modification model of a method for selecting parameters of a transformer bushing shed according to an embodiment of the present invention. l1’、l2’、…、ln' A1 st umbrella tip to a 2 nd umbrella tip, a 2 nd umbrella tip to a 3 rd umbrella tip, …, an nth umbrella tip to an n +1 th umbrella tip, respectively; the 1 st umbrella, the 2 nd umbrella, … and the nth umbrella are sequentially arranged on the structure;
in the formula (2), E ' is the electric field intensity of the planar path, L ' is the planar path, and s ' is the path arc length.
Preferably, the conducting rod and the innermost capacitor layer are loaded with 318kV voltage, the flange, the oil tank and the outermost capacitor layer are grounded, and finite element simulation software CommollMultiphysics is used for carrying out 50Hz frequency domain simulation calculation on the sleeve model.
S5, selecting an umbrella spacing value range according to the electric field intensity of air gap paths of the umbrella skirts under different umbrella spacing modification models in the umbrella spacing modification model group;
the method comprises the following specific steps:
the air gap path electric field intensity E is calculated according to the following formula (3)l1、El2 and El3Average value of Eair：
Eair＝(El1+El2+El3)/3 (3)
Taking air gap path electric field intensity El1、El2 and El3Maximum value of E asmaxMinimum value as Emin；
The relative pole difference Δ air of the air gap path electric field strength is calculated according to the following equation (4):
Δair＝(Emax-Emin)/Eair(4)
respectively obtaining the average value of the electric field intensity of the air gap path of different umbrella space modification models and the relative extreme difference of the electric field intensity of the air gap path by adopting the formula (3) and the formula (4);
a coordinate curve of the average value of the electric field intensity of the air gap path and a coordinate curve of the relative pole difference of the electric field intensity of the air gap path are respectively drawn in the same coordinate system, and refer to fig. 4, which is a schematic diagram of the coordinate curve of the average value of the electric field intensity of the air gap path and the coordinate curve of the relative pole difference of the electric field intensity of the air gap path in the method for selecting parameters of the transformer bushing shed according to the embodiment of the present invention.
The intersection point of the coordinate curve of the average value of the electric field intensity of the air gap path and the coordinate curve of the relative range of the electric field intensity of the air gap path is taken as an optional range endpoint, and the average value of the electric field intensity of the air gap path corresponding to the optional range endpoint is set as Eair1。
Selecting the average value of the air gap path electric field intensity on the coordinate curve of the average value of the air gap path electric field intensity not greater than Eair1The set of all points of (a) is taken as the umbrella spacing value range.
Preferably, the umbrella spacing is in the range of [80, 100 ].
S6, selecting an umbrella extension value range according to the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
the method comprises the following specific steps:
the average value E of the electric field intensity along the surface path is calculated according to the following formula (5)surf：
Esurf＝(El1’+El2’+…+Eln’)/n (5)
Take the electric field intensity E of the creeping pathl1’、El2’、…、ElnMaximum value in' as Emax', minimum value as Emin’；
The relative pole difference Δ surf of the electric field intensity along the planar path is calculated according to the following equation (6):
Δsurf＝(Emax’-Emin’)/Esurf(6)
respectively obtaining the average value of the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models and the relative range of the electric field intensity of the surface path by adopting the formula (5) and the formula (6);
a coordinate curve of the average value of the electric field intensity of the creeping path and a coordinate curve of the relative pole difference of the electric field intensity of the creeping path are respectively drawn in the same coordinate system, and refer to fig. 5, which is a schematic diagram of the coordinate curve of the average value of the electric field intensity of the creeping path and the coordinate curve of the relative pole difference of the electric field intensity of the creeping path in the method for selecting parameters of the transformer bushing shed according to the embodiment of the present invention.
The intersection point of the coordinate curve of the average value of the electric field intensity of the creeping path and the coordinate curve of the relative range of the electric field intensity of the creeping path is taken as an optional range end point, and the average value of the electric field intensity of the creeping path corresponding to the optional range end point is set as Esurf1。
Selecting the mean value of the electric field intensity of the creeping path on the coordinate curve of the mean value of the electric field intensity of the creeping path not more than Esurf1The set of all points of (a) is taken as the umbrella extension value range.
Preferably, the umbrella extension range is [90, 110 ].
S7, determining a value range of the transformer bushing shed parameters according to the umbrella space value range and the umbrella extension value range, and selecting the transformer bushing shed parameters from the value range of the transformer bushing shed parameters;
preferably, the value range of the umbrella skirt parameter of the transformer bushing is 80mm or more and 100mm or less of the umbrella space, and 90mm or more and 110mm or less of the umbrella extension.
Preferably, the parameters of the transformer bushing shed are selected to be that the distance between umbrellas is 80mm, and the extension of the umbrellas is 90 mm.
Referring to fig. 6, which is a schematic structural diagram of a device for selecting parameters of a transformer bushing shed according to a second embodiment of the present invention, the device includes:
the modeling module 1 is used for establishing a reference model of the transformer bushing; and establishing an umbrella spacing modification model group and an umbrella extending modification model group according to the reference model of the transformer bushing.
The calculation module 2 is used for calculating the umbrella space modification model group to obtain the electric field intensity of the air gap path of the umbrella skirt under different umbrella space modification models in the umbrella space modification model group;
and calculating the umbrella extension modification model group to obtain the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group.
The selection module 3 selects an umbrella space value range according to the electric field intensity of the air gap path of the umbrella skirt under different umbrella space modification models in the umbrella space modification model group; selecting an umbrella extension value range according to the electric field intensity of the edgewise path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group; and determining the value range of the transformer bushing shed parameters according to the value range of the umbrella space and the value range of the umbrella extension, and selecting the transformer bushing shed parameters from the value range of the transformer bushing shed parameters.
Compared with the prior art, the method and the device for selecting the parameters of the umbrella skirt of the transformer bushing have the following beneficial effects that:
the method comprises the steps that the umbrella distance parameter value range and the umbrella extension parameter value range of an umbrella skirt are obtained through modeling and simulation calculation of the umbrella skirt, the value of the transformer bushing umbrella skirt parameter is determined according to the umbrella distance parameter value range and the umbrella extension parameter value range of the umbrella skirt, the value of the transformer bushing umbrella skirt parameter is limited in terms of umbrella distance and umbrella extension, and the value of the transformer bushing umbrella skirt parameter is enabled to be more excellent; the method has the advantages that the influence of other variables on a simulation calculation result can be eliminated by controlling the variable method to carry out the modeling of the correction model on the shed, the stability of the simulation calculation result is improved, and the problems of high test cost and long test time consumption caused by carrying out a large number of artificial rain tests on the porcelain sleeve of the transformer are solved; the umbrella skirt parameters are limited through relative range, and the accuracy of the umbrella skirt parameter selection range is further improved.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (9)

1. A method for selecting parameters of a transformer bushing shed is characterized by comprising the following steps:
establishing a reference model of the transformer bushing;
establishing an umbrella spacing modification model group and an umbrella extension modification model group according to a reference model of a transformer bushing;
carrying out simulation calculation on the umbrella spacing modification model group to obtain the electric field intensity of air gap paths of the umbrella skirts under different umbrella spacing modification models in the umbrella spacing modification model group;
carrying out simulation calculation on the umbrella extension modification model group to obtain the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
selecting an umbrella spacing value range according to the electric field intensity of the air gap path of the umbrella skirt under different umbrella spacing modification models in the umbrella spacing modification model group;
selecting an umbrella extension value range according to the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
and determining the value range of the transformer bushing shed parameters according to the value range of the umbrella space and the value range of the umbrella extension, and selecting the transformer bushing shed parameters from the value range of the transformer bushing shed parameters.
2. The method for selecting the parameters of the transformer bushing sheds according to claim 1, wherein the specific method for establishing the reference model of the transformer bushing is as follows:
establishing a full-size reference model of the transformer bushing;
the reference model comprises an umbrella skirt, wherein the umbrella skirt at least comprises a small umbrella and two large umbrellas which are adjacent to each other left and right.
3. The method for selecting parameters of the umbrella skirt of the transformer bushing according to claim 2, wherein the specific method for establishing the umbrella space modification model group and the umbrella extension modification model group according to the reference model of the transformer bushing is as follows:
the method comprises the steps of adopting a variable control method, controlling the dry arc distance, the umbrella extension difference and the inclination angle to be unchanged, changing the umbrella spacing of a transformer bushing, and establishing an umbrella spacing modification model group;
the umbrella space modification model group comprises umbrella space modification models under the umbrella spaces of a plurality of different transformer bushings;
the method comprises the steps of adopting a variable control method, controlling the dry arc distance, the umbrella spacing, the umbrella extension difference and the inclination angle to be unchanged, changing the umbrella extension of a transformer bushing, and establishing an umbrella extension modification model group;
the umbrella extension modification model group comprises umbrella extension modification models under umbrella extension of a plurality of different transformer bushings.
4. The method for selecting the parameters of the transformer bushing sheds according to claim 3, wherein the range of the spacing between the reference model and the modified model is 50mm to 100 mm; the extending range of the umbrella is 80 mm-110 mm; the spread of the umbrella is 15 mm-25 mm; the range of the inclination angle of the umbrella skirt is 5-20 degrees.
5. The method for selecting parameters of the transformer bushing sheds according to claim 4, wherein the specific method for obtaining the electric field intensity of the air gap path of the sheds under different shed spacing modification models in the shed spacing modification model group by performing simulation calculation on the shed spacing modification model group is as follows:
respectively carrying out 50Hz frequency domain simulation calculation on the reference model and the umbrella space modification model group to obtain the electric field intensity of the air domain around the sleeve umbrella skirt of the reference model and each umbrella space modification model;
by the following formula (1):
respectively calculating derivative values of the electric field intensity of the surrounding air domain of the sleeve umbrella skirt of each umbrella spacing modification model to obtain the air gap path electric field intensity E corresponding to l1, l2 and l3 under each umbrella spacing modification modell1、El2 and El3；
Taking one small umbrella in an umbrella skirt as a middle umbrella, wherein two large umbrellas adjacent to each other on the left and right sides of the middle umbrella are respectively a first adjacent umbrella and a second adjacent umbrella, l1 is the shortest air gap path from the top end of the first adjacent umbrella to the top end of the middle umbrella, l2 is the shortest air gap path from the top end of the second adjacent umbrella to the top end of the middle umbrella, and l3 is the shortest air gap path from the top end of the first adjacent umbrella to the top end of the second adjacent umbrella;
in equation (1), E is the air gap path electric field strength, L is the air gap path, and s is the path arc length.
6. The method for selecting parameters of the transformer bushing shed as claimed in claim 5, wherein the specific method for calculating the umbrella extension modification model group to obtain the electric field intensity along the surface path of the shed under different umbrella extension modification models in the umbrella extension modification model group is as follows:
respectively carrying out 50Hz frequency domain simulation calculation on the reference model and the umbrella extension modification model group to obtain the electric field intensity of the surface of the sleeve umbrella skirt of each reference model and each umbrella extension modification model;
by the following formula (2):
calculating derivative values of the surface electric field intensity of the sleeve umbrella skirt of the umbrella extension modification model to obtain the reference model and l of each umbrella extension modification model1’、l2’、…、ln' corresponding creeping path electric field intensity El1’、El2’、…、Eln’；
wherein ,l1’、l2’、…、ln' A1 st umbrella tip to a 2 nd umbrella tip, a 2 nd umbrella tip to a 3 rd umbrella tip, …, an nth umbrella tip to an n +1 th umbrella tip, respectively; the 1 st umbrella, the 2 nd umbrella, the … th umbrella and the nth umbrella are sequentially arranged on the structure;
in the formula (2), E ' is the electric field intensity of the planar path, L ' is the planar path, and s ' is the path arc length.
7. The method for selecting parameters of the transformer bushing sheds according to claim 6, wherein the specific step of selecting the range of the shed pitch value according to the electric field intensity of the air gap path of the sheds under different shed pitch modification models in the shed pitch modification model group is as follows:
the air gap path electric field intensity E is calculated according to the following formula (3)l1、El2 and El3Average value of Eair：
Eair＝(El1+El2+El3)/3 (3)
Taking the air gap path electric field intensity El1、El2 and El3Maximum value of E asmaxMinimum value as Emin；
The relative pole difference Δ air of the air gap path electric field strength is calculated according to the following equation (4):
Δair＝(Emax-Emin)/Eair(4)
respectively obtaining the average value of the electric field intensity of the air gap path of different umbrella space modification models and the relative extreme difference of the electric field intensity of the air gap path by adopting the formula (3) and the formula (4);
respectively drawing a coordinate curve of the average value of the electric field intensity of the air gap path and a coordinate curve of the relative polar difference of the electric field intensity of the air gap path in the same coordinate system, taking the intersection point of the coordinate curve of the average value of the electric field intensity of the air gap path and the coordinate curve of the relative polar difference of the electric field intensity of the air gap path as an optional range end point, and setting the average value of the electric field intensity of the air gap path corresponding to the optional range end point as Eair1；
Selecting the average value of the electric field intensity of the air gap path on a coordinate curve of the average value of the electric field intensity of the air gap path not more than Eair1The set of all points of (a) is taken as the umbrella spacing value range.
8. The method for selecting the parameters of the transformer bushing sheds according to claim 6, wherein the specific steps of selecting the shed extension value range according to the electric field intensity of the surface paths of the sheds under different shed extension modification models in the shed extension modification model group are as follows:
the average value E of the electric field intensity along the surface path is calculated according to the following formula (5)surf：
Esurf＝(El1’+El2’+…+Eln’)/n (5)
Taking the electric field intensity E of the creeping pathl1’、El2’、…、ElnMaximum value in' as Emax', minimum value as Emin’；
The relative pole difference Δ surf of the electric field intensity along the planar path is calculated according to the following equation (6):
Δsurf＝(Emax’-Emin’)/Esurf(6)
respectively obtaining the average value of the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models and the relative range of the electric field intensity of the surface path by adopting the formula (5) and the formula (6);
respectively drawing a coordinate curve of the average value of the electric field intensity of the creeping path and a coordinate curve of the relative range of the electric field intensity of the creeping path in the same coordinate system, taking the intersection point of the coordinate curve of the average value of the electric field intensity of the creeping path and the coordinate curve of the relative range of the electric field intensity of the creeping path as an optional range end point, and setting the average value of the electric field intensity of the creeping path corresponding to the optional range end point as Esurf1；
Selecting the mean value of the electric field intensity of the creeping path on the coordinate curve of the mean value of the electric field intensity of the creeping path not more than Esurf1The set of all points of (a) is taken as the umbrella extension value range.
9. The utility model provides a device is selected to transformer bushing umbrella skirt parameter which characterized in that includes:
the modeling module is used for establishing a reference model of the transformer bushing; establishing an umbrella spacing modification model group and an umbrella extension modification model group according to a reference model of a transformer bushing;
the calculation module is used for calculating the umbrella space modification model group to obtain the electric field intensity of the air gap path of the umbrella skirt under different umbrella space modification models in the umbrella space modification model group;
calculating an umbrella extension modification model group to obtain the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
the selection module selects an umbrella spacing value range according to the electric field intensity of air gap paths of umbrella skirts under different umbrella spacing modification models in the umbrella spacing modification model group;
selecting an umbrella extension value range according to the electric field intensity of the surface path of the umbrella skirt under different umbrella extension modification models in the umbrella extension modification model group;
and determining the value range of the transformer bushing shed parameters according to the value range of the umbrella space and the value range of the umbrella extension, and selecting the transformer bushing shed parameters from the value range of the transformer bushing shed parameters.
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