CN113029478B - High-voltage direct-current wall bushing deflection calculation and measurement method - Google Patents
High-voltage direct-current wall bushing deflection calculation and measurement method Download PDFInfo
- Publication number
- CN113029478B CN113029478B CN202110304897.7A CN202110304897A CN113029478B CN 113029478 B CN113029478 B CN 113029478B CN 202110304897 A CN202110304897 A CN 202110304897A CN 113029478 B CN113029478 B CN 113029478B
- Authority
- CN
- China
- Prior art keywords
- sleeve
- voltage direct
- deflection
- bushing
- current wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0025—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of elongated objects, e.g. pipes, masts, towers or railways
-
- 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
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Insulators (AREA)
Abstract
The invention discloses a deflection calculation and measurement method of a high-voltage direct-current wall bushing, which relates to the field of equipment state evaluation, wherein the middle wall penetrating part of the high-voltage direct-current wall bushing is used as a unique carrying point, an outdoor side bushing of the high-voltage direct-current wall bushing is regarded as fixed, and an indoor side bushing of the high-voltage direct-current wall bushing is regarded as a suspended cantilever beam; and obtaining the maximum deflection of the end part of the high-voltage direct-current wall bushing. The high-voltage direct-current wall bushing deflection calculation and measurement method provided by the invention has simple flow, is convenient to popularize and apply, realizes effective evaluation of the high-voltage direct-current wall bushing deflection, and provides effective reference for safe operation decision of the bushing.
Description
Technical Field
The invention relates to the field of equipment state evaluation, in particular to a high-voltage direct-current wall bushing deflection calculation and measurement method.
Background
The Chinese operators have wide areas and rich power resources, but the energy is concentrated in the western region and the load demand is concentrated in the eastern coastal region, so that the national power construction 'western electric east delivery' project is also promoted. The direct current transmission project is used as a western electric eastern transmission main channel, great power transmission is born, the direct current wall bushing is used as one of core equipment in the direct current transmission project, and the running state of the direct current wall bushing tends to influence the safety and stability of the whole system. The high-voltage direct-current wall bushing has the characteristics of large size and heavy weight, and in actual operation, only the middle wall-penetrating part is used as the only carrying point, so that deflection deformation to a certain degree is likely to occur at two ends (outdoor side and indoor side) of the bushing due to self gravity, connection of a current-carrying structure at the end part of the bushing is further influenced, and overheating fault of the bushing is caused. For the extra-high voltage direct current wall bushing, the size is larger, the weight is multiplied, and the deflection deformation is more serious. At present, the research at home and abroad is blank aiming at the calculation and measurement method of the deflection of the direct current wall bushing, and the similar method is mainly concentrated in the fields of civil engineering and construction, but the corresponding method cannot be directly used.
Disclosure of Invention
Aiming at the problem that no effective method for calculating and measuring the deflection of the high-voltage direct-current wall bushing exists at present, the invention provides a method for calculating and measuring the deflection of the high-voltage direct-current wall bushing.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a high-voltage direct-current wall bushing deflection calculation method comprises the following steps:
taking the middle wall penetrating part of the high-voltage direct-current wall bushing as the only carrying point, taking the outdoor side bushing of the high-voltage direct-current wall bushing as a fixed part, and taking the indoor side bushing of the high-voltage direct-current wall bushing as a suspended cantilever beam;
maximum deflection N of end part of high-voltage direct-current wall bushing max (mm) is:
wherein alpha is a fine tuning coefficient of deflection calculation, and the value range is [0.05-0.15 ]]The method comprises the steps of carrying out a first treatment on the surface of the q represents a uniformly distributed load value (N/mm); l represents the length (mm) of the sleeve; e represents the elastic modulus (kN/mm) 2 ) The method comprises the steps of carrying out a first treatment on the surface of the I represents a section moment of inertia (mm) 4 )。
According to the high-voltage direct-current wall bushing deflection calculation method, further, the bushing section can be regarded as a circular section, so that the calculation formula of the moment of inertia of the circular section is calculated according to structural mechanics:
I＝π·d 4 /64
where d represents the cross-sectional diameter (mm).
A high-voltage direct-current wall bushing deflection measuring method comprises the following steps:
the support piece for the high-voltage direct-current wall bushing is placed to keep a horizontal state, and the distance H between the centers of the ends of the outdoor side bushing and the indoor side bushing and the ground in the state is measured 1 、H 2 ；
Tying up the hanging strip at the end part of the outdoor side sleeve, gradually increasing the lifting tension until the weight of the sleeve is borne by the hanging strip, removing the supporting piece at the end part of the outdoor side sleeve, and then gradually reducing the lifting tension until the hanging strip is completely unstressed, so as to simulate the suspended state of the sleeve during operation, and measuring the distance H 'between the center of the end part of the outdoor side sleeve and the ground again' 1 The deflection measured value of the outdoor side sleeve is as follows:
ΔN 1 ＝H′ 1 -H 1
tying up the hanging strip at the end part of the indoor side sleeve, gradually increasing the lifting tension until the weight of the sleeve is borne by the hanging strip, removing the supporting piece at the end part of the indoor side sleeve, and then gradually reducing the lifting tension until the hanging strip is completely unstressed, so as to simulate the suspended state of the sleeve during operation, and measuring the distance H 'between the center of the end part of the indoor side sleeve and the ground again' 2 The deflection measured value of the outdoor side sleeve is as follows:
ΔN 2 ＝H′ 2 -H 2
based on delta N 1 ΔN 2 Calculating fine tuning coefficients alpha of deflection calculation corresponding to the outdoor side and the indoor side by using the deflection calculation method 1 Alpha and alpha 2 ；
Based on the trimming coefficient alpha 1 Alpha and alpha 2 And obtaining a sleeve deflection calculation formula which accords with the actual situation.
Compared with the prior art, the invention has the beneficial effects that: the high-voltage direct-current wall bushing deflection calculation and measurement method provided by the invention has simple flow, is convenient to popularize and apply, realizes effective evaluation of the high-voltage direct-current wall bushing deflection, and provides effective reference for safe operation decision of the bushing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a high-voltage direct-current wall bushing deflection calculation and measurement method provided by the invention;
FIG. 2 is a schematic illustration of the horizontal placement of the HVDC wall bushing in an example;
FIG. 3 is a schematic illustration of an example high voltage DC wall bushing outdoor side deflection measurement;
fig. 4 is a schematic illustration of an example dc wall bushing indoor side deflection measurement.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Examples:
it should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 4, fig. 1 is a schematic flow chart of a method for calculating and measuring deflection of a high-voltage direct-current wall bushing according to the present invention; FIG. 2 is a schematic illustration of the horizontal placement of the HVDC wall bushing in an example; FIG. 3 is a schematic illustration of an example high voltage DC wall bushing outdoor side deflection measurement; fig. 4 is a schematic illustration of an example dc wall bushing indoor side deflection measurement.
Aiming at the problem that no effective method for calculating and measuring the deflection of the high-voltage direct-current wall bushing exists at present, the invention provides a method for calculating and measuring the deflection of the high-voltage direct-current wall bushing.
1. High-voltage direct-current wall bushing deflection calculation
Because the middle wall-through part is the only carrying point when the high-voltage direct-current wall-through sleeve is actually installed, the outdoor side sleeve and the indoor side sleeve can be respectively regarded as a section of fixed and a section of suspended cantilever beam to calculate deflection.
The calculation thought of the maximum deflection of the sleeve end is simplified to calculate the maximum deflection N of the free end under the condition that the cantilever beam is uniformly loaded max (mm)：
Wherein alpha is a fine tuning coefficient of deflection calculation, and the value range is [0.05-0.15 ]]The method comprises the steps of carrying out a first treatment on the surface of the q represents a uniformly distributed load value (N/mm); l represents the length (mm) of the sleeve; e represents the elastic modulus (kN/mm) 2 ) The method comprises the steps of carrying out a first treatment on the surface of the I represents a section moment of inertia (mm) 4 ). The sleeve section can be regarded as a circular section, and therefore according to the formula for calculating the moment of inertia of the circular section by structural mechanics:
I＝π·d 4 /64 (2)
where d represents the cross-sectional diameter (mm).
It should be noted that, for the wall bushing, since the bushing has more components and more complex materials, the selected value of the elastic modulus E in the formula may not be accurate, so that the deflection measurement mode may be added in the bushing factory type test to determine the fine tuning coefficient α of deflection calculation, thereby forming an accurate deflection calculation formula.
2. A high-voltage direct-current wall bushing deflection measuring method.
1) The high-voltage direct-current wall bushing is placed on the ground by a supporting wood block, the horizontal state is kept, and the distance H between the center of the end parts of the outdoor side and the indoor side bushing and the ground is measured 1 、H 2 。
2) And bundling the hanging strips at the ends of the outdoor side sleeves, gradually increasing the hanging pulling force until the weight of the sleeves is borne by the hanging strips, and removing the supporting wood blocks at the ends of the outdoor side sleeves. And then gradually reducing the lifting pulling force until the hanging strip is completely unstressed, so as to simulate the suspended state of the sleeve during operation. The distance H 'between the center of the end of the outdoor side sleeve and the ground is measured again' 1 The deflection measured value of the outdoor side sleeve is as follows:
ΔN 1 ＝H′ 1 -H 1
3) And bundling hanging strips at the end parts of the indoor side sleeves, gradually increasing the hanging pulling force until the weight of the sleeves is borne by the hanging strips, and removing the supporting wood blocks at the end parts of the indoor side sleeves. Then gradually reducing the lifting force until the hanging belt is completely unstressed, thereby simulating the running of the sleeveIs suspended. The distance H 'between the center of the end of the indoor side sleeve and the ground is measured again' 2 The deflection measured value of the outdoor side sleeve is as follows:
ΔN 2 ＝H′ 2 -H 2
4) Respectively make DeltaN 1 ΔN 2 Substituting into (1), calculating fine tuning coefficient alpha of deflection calculation corresponding to outdoor side and indoor side 1 Alpha and alpha 2 The method comprises the following steps:
therefore, a deflection calculation formula which accords with the actual condition of the sleeve can be obtained.
In one embodiment, the method comprises the steps of:
1. firstly, high-voltage direct current wall bushing deflection measurement is carried out.
1) The sleeve supporting wood block is placed on the ground and kept in a horizontal state, and the center of the ends of the outdoor side sleeve and the indoor side sleeve is separated from the ground H 1 、H 2 715mm and 702mm, respectively.
2) And bundling the hanging strips at the ends of the outdoor side sleeves, gradually increasing the hanging pulling force until the weight of the sleeves is borne by the hanging strips, and removing the supporting wood blocks at the ends of the outdoor side sleeves. And then gradually reducing the lifting pulling force until the hanging strip is completely unstressed, so as to simulate the suspended state of the sleeve in operation, and measuring the distance between the center of the end part of the sleeve and the ground, namely 682mm at the moment, so that the deflection of the outdoor sleeve is calculated to be about 33mm.
3) And carrying out indoor side sleeve deflection measurement in the same step on time. The center distance between the end of the suspended indoor side sleeve and the ground is 688mm, and the deflection of the indoor side sleeve is calculated to be about 14mm.
2. And solving to obtain a high-voltage direct-current wall bushing deflection calculation formula.
1) According to the parameters of the nameplate of the sleeve, the mass of the sleeve at the outdoor side is 4500kg (comprising the composite insulating sleeve), and the length of the sleeve is 10000mm, q=4500×10/10000=4.5N/mm. The sleeve is mainly made of epoxy resin, so that the elastic modulus of the sleeve is according to the followingThe epoxy material was calculated. According to GB/T1303.4-2009, fourth part of industrial rigid laminates for thermosetting resins for electric use: epoxy resin hard laminate, the elastic modulus value of the epoxy resin material is 20GPa, namely E=20kN/mm 2 . The outside casing section diameter is about 600mm, so the casing section moment of inertia i=3.14×600≡4/64=6.36×10≡9mm 4 . And (3) substituting 33mm of the deflection of the outdoor side sleeve measured in the step (1) into the formula (3), and calculating to obtain the fine tuning coefficient alpha of the outdoor side sleeve 1 0.09328. Therefore, the deflection calculation formula for the outdoor side of the sleeve of this type is:
2) 2) according to the parameters of the nameplate of the sleeve, the mass of the sleeve on the indoor side is 4300kg (comprising the composite insulating sleeve), and the length of the sleeve is 8000mm, q=4300×10/8000= 5.375N/mm. The sleeve is mainly made of epoxy resin, so that the elastic modulus of the sleeve is calculated according to the epoxy resin material. According to GB/T1303.4-2009, fourth part of industrial rigid laminates for thermosetting resins for electric use: epoxy resin hard laminate, the elastic modulus value of the epoxy resin material is 20GPa, namely E=20kN/mm 2 . The diameter of the indoor side sleeve is about 600mm, so the sleeve section moment of inertia i=3.14×600≡4/64=6.36×10≡9mm 4 . And (3) substituting the deflection of the outdoor side sleeve measured in the step (1) into the sleeve (3) to calculate and obtain the fine tuning coefficient alpha of the indoor side sleeve 2 0.08088. Therefore, the deflection calculation formula for the outdoor side of the sleeve of this type is:
in the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. The high-voltage direct-current wall bushing deflection measuring method is characterized by comprising the following steps of:
taking the middle wall penetrating part of the high-voltage direct-current wall bushing as the only carrying point, taking the outdoor side bushing of the high-voltage direct-current wall bushing as a fixed part, and taking the indoor side bushing of the high-voltage direct-current wall bushing as a suspended cantilever beam;
maximum deflection N of end part of high-voltage direct-current wall bushing max (mm) is:
wherein alpha is a fine tuning coefficient of deflection calculation, and the value range is [0.05-0.15 ]]The method comprises the steps of carrying out a first treatment on the surface of the q represents a uniformly distributed load value (N/mm); l represents the length (mm) of the sleeve; e represents the elastic modulus (kN/mm) 2 ) The method comprises the steps of carrying out a first treatment on the surface of the I represents a section moment of inertia (mm) 4 )；
The support piece for the high-voltage direct-current wall bushing is placed to keep a horizontal state, and the distance H between the centers of the ends of the outdoor side bushing and the indoor side bushing and the ground in the state is measured 1 、H 2 ；
Outside side sleeve endPart bundling hanging belt, gradually increasing the lifting tension until the weight of the sleeve is borne by the hanging belt, removing the support piece at the end part of the sleeve outside the user, gradually reducing the lifting tension until the hanging belt is completely unstressed, simulating the suspended state of the sleeve during operation, and measuring the distance H 'between the center of the end part of the sleeve outside the user and the ground again' 1 The deflection measured value of the outdoor side sleeve is as follows:
tying up the hanging strip at the end part of the indoor side sleeve, gradually increasing the lifting tension until the weight of the sleeve is borne by the hanging strip, removing the supporting piece at the end part of the indoor side sleeve, and then gradually reducing the lifting tension until the hanging strip is completely unstressed, so as to simulate the suspended state of the sleeve during operation, and measuring the distance H 'between the center of the end part of the indoor side sleeve and the ground again' 2 The deflection measured value of the outdoor side sleeve is as follows:
based on delta N 1 ΔN 2 Based on the maximum deflection N of the end part max (mm) calculating a fine tuning coefficient alpha of deflection calculation corresponding to the outdoor side and the indoor side 1 Alpha and alpha 2 ；
Based on the trimming coefficient alpha 1 Alpha and alpha 2 And obtaining a sleeve deflection calculation formula which accords with the actual situation.
2. The method for measuring deflection of a high-voltage direct-current wall bushing according to claim 1, wherein the bushing section can be regarded as a circular section, so that the calculation formula of the moment of inertia of the circular section is calculated according to structural mechanics:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110304897.7A CN113029478B (en) | 2021-03-17 | 2021-03-17 | High-voltage direct-current wall bushing deflection calculation and measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110304897.7A CN113029478B (en) | 2021-03-17 | 2021-03-17 | High-voltage direct-current wall bushing deflection calculation and measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113029478A CN113029478A (en) | 2021-06-25 |
| CN113029478B true CN113029478B (en) | 2023-05-16 |
Family
ID=76472537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110304897.7A Active CN113029478B (en) | 2021-03-17 | 2021-03-17 | High-voltage direct-current wall bushing deflection calculation and measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113029478B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06105934A (en) * | 1992-09-28 | 1994-04-19 | Fujikura Rubber Ltd | Method for measuring deflection characteristic of golf club shaft |
| RU2120120C1 (en) * | 1991-06-28 | 1998-10-10 | Научно-производственное предприятие "Аэросила" | Method of determination of bending rigidity of objects made of composition materials |
| RU2009101870A (en) * | 2009-01-21 | 2010-07-27 | Государственное образовательное учреждение высшего профессионального образования "Орловский государственный технический университе | METHOD FOR DETERMINING HORIZONTAL SEAM RIGIDITY IN TWO-LAYER STRUCTURES OF BEAM TYPE |
| CN104359765A (en) * | 2014-12-03 | 2015-02-18 | 广州广电运通金融电子股份有限公司 | Method for measuring elasticity modulus of bank note and device for measuring maximum bending deflection |
| RU2553713C1 (en) * | 2014-02-13 | 2015-06-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Поволжский государственный технологический университет" | Method of diagnostic representation and analysis of cantilever beam flexures |
| CN108152134A (en) * | 2017-12-12 | 2018-06-12 | 中国西电电气股份有限公司 | A kind of wall bushing cantilever loading experimental rig and test method |
| CN108458846A (en) * | 2018-04-08 | 2018-08-28 | 李国栋 | A kind of computational methods, the device and system of girder structure amount of deflection |
| CN209820718U (en) * | 2019-03-06 | 2019-12-20 | 广东金刚新材料有限公司 | Ceramic roller deflection detector |
| CN112487712A (en) * | 2020-11-25 | 2021-03-12 | 中国科学院力学研究所 | Underground suspended pipeline working condition parameter intelligent identification method based on genetic algorithm and multidimensional dynamic time warping |
-
2021
- 2021-03-17 CN CN202110304897.7A patent/CN113029478B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2120120C1 (en) * | 1991-06-28 | 1998-10-10 | Научно-производственное предприятие "Аэросила" | Method of determination of bending rigidity of objects made of composition materials |
| JPH06105934A (en) * | 1992-09-28 | 1994-04-19 | Fujikura Rubber Ltd | Method for measuring deflection characteristic of golf club shaft |
| RU2009101870A (en) * | 2009-01-21 | 2010-07-27 | Государственное образовательное учреждение высшего профессионального образования "Орловский государственный технический университе | METHOD FOR DETERMINING HORIZONTAL SEAM RIGIDITY IN TWO-LAYER STRUCTURES OF BEAM TYPE |
| RU2553713C1 (en) * | 2014-02-13 | 2015-06-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Поволжский государственный технологический университет" | Method of diagnostic representation and analysis of cantilever beam flexures |
| CN104359765A (en) * | 2014-12-03 | 2015-02-18 | 广州广电运通金融电子股份有限公司 | Method for measuring elasticity modulus of bank note and device for measuring maximum bending deflection |
| CN108152134A (en) * | 2017-12-12 | 2018-06-12 | 中国西电电气股份有限公司 | A kind of wall bushing cantilever loading experimental rig and test method |
| CN108458846A (en) * | 2018-04-08 | 2018-08-28 | 李国栋 | A kind of computational methods, the device and system of girder structure amount of deflection |
| CN209820718U (en) * | 2019-03-06 | 2019-12-20 | 广东金刚新材料有限公司 | Ceramic roller deflection detector |
| CN112487712A (en) * | 2020-11-25 | 2021-03-12 | 中国科学院力学研究所 | Underground suspended pipeline working condition parameter intelligent identification method based on genetic algorithm and multidimensional dynamic time warping |
Non-Patent Citations (1)
| Title |
|---|
| 田文超等.微机电技术.2014,367-368. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113029478A (en) | 2021-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yahaya et al. | Power loss due to corona on High Voltage Transmission lines. | |
| CN102290155A (en) | Design method for insulation thickness of high-voltage cross-linked polyethylene direct current (DC) cable | |
| CN113029478B (en) | High-voltage direct-current wall bushing deflection calculation and measurement method | |
| CN105631175B (en) | A kind of modification method of extra high voltage line operation voltage equivalence wind speed | |
| Tanaka et al. | Winding Arrangement of High-frequency Amorphous Transformers for MW-class DC-DC Converters | |
| Zhang et al. | Stability analysis of the cable core of a 10 kA HTS DC power cable used in the electrolytic aluminum industry | |
| CN109239789B (en) | Electromagnetic coil for helicopter time domain aviation detection application | |
| CN105740500A (en) | Composite tower overvoltage simulation model design method | |
| CN216771277U (en) | Static bending test device of post insulator | |
| Grzybowski et al. | Electrical performance of fiberglass crossarm in distribution and transmission lines | |
| Awad et al. | Mitigation of switching overvoltages due to energization procedures in grid-connected offshore wind farms | |
| CN106771386A (en) | A kind of electrical test thread guide devices for making somebody a mere figurehead electrical equipment | |
| CN109066613B (en) | Method and device for setting pilot differential protection setting value | |
| Kocewiak et al. | Impact of cable impedance modelling assumptions on harmonic losses in offshore wind power plants | |
| CN103135025B (en) | The lookup method of short dot between the transformer core frame of million kilowatt nuclear power station | |
| Khan et al. | Comparison of transmission losses and voltage drops of GIL (Gas Insulated transmission line) and overhead transmission lines | |
| Li et al. | The optimal phase sequence arrangement of multicircuit transmission lines on the same tower | |
| CN208618905U (en) | A kind of insulation electric pole of 10kV high-tension line | |
| Izumi et al. | Development of line post type polymer insulation arm for 154 kV | |
| Nah et al. | Quench characteristics of 5-cm-aperture, 15-m-long SSC dipole magnet prototypes | |
| Schichler et al. | Innovation-section: test-run for uprating a 220 kV OHL to 380 kV using insulated cross-arms and coated conductors | |
| CN108008168A (en) | A kind of metering box bracket with lengthening function | |
| CN204793621U (en) | Lightning arrester with tally function | |
| Nawi et al. | Comparative analysis of ACSR and ACCC conductors on corona effect for lightning surge studies | |
| Lilien et al. | Calculation of spacer compression for bundle lines under short-circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 maintenance and test center, building 2, 223, science Avenue, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Corporation Ultra High Voltage Transmission Company Electric Power Research Institute Address before: 510663 maintenance and test center, building 2, 223, science Avenue, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee before: MAINTENANCE & TEST CENTRE, CSG EHV POWER TRANSMISSION Co. |