EP1528576A2 - Elektrischer Isolator - Google Patents

Elektrischer Isolator Download PDF

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Publication number
EP1528576A2
EP1528576A2 EP04025657A EP04025657A EP1528576A2 EP 1528576 A2 EP1528576 A2 EP 1528576A2 EP 04025657 A EP04025657 A EP 04025657A EP 04025657 A EP04025657 A EP 04025657A EP 1528576 A2 EP1528576 A2 EP 1528576A2
Authority
EP
European Patent Office
Prior art keywords
electrical insulator
shed
metal part
airflow
sheds
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.)
Withdrawn
Application number
EP04025657A
Other languages
English (en)
French (fr)
Other versions
EP1528576A3 (de
Inventor
Kiyoshi Morita
Kazuyuki Sugimura
Takahiro Chono
Morishige Hattori
Katsufumi Hashimoto
Takeshi Kurita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP1528576A2 publication Critical patent/EP1528576A2/de
Publication of EP1528576A3 publication Critical patent/EP1528576A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/14—Supporting insulators
    • H01B17/18—Supporting insulators for very heavy conductors, e.g. bus-bars, rails

Definitions

  • the present invention relates to an electrical insulator, and more specifically relates to means for reducing aerodynamic noise caused by an electrical insulator for a current collector of a railway vehicle which moves at a high velocity.
  • Aerodynamic noise caused by a railway vehicle moving at a high velocity increases proportionally to about 6th to 8th power of the velocity. Therefore, noise significantly increases as the velocity increases. On the other hand, it is expected that requirements for environmental protection will further increase.
  • high-velocity railway vehicles are expected to reduce the noise caused by current collector, which is the main source of aerodynamic noise, and noise reduction of the electrical insulator included in the current collector is also required accordingly.
  • JP2002-329433A discloses an electrical insulator with a noise reduction structure in which the electrical insulator has an elliptical or oval cross section and includes three or more kinds of sheds having different shed diameters, the three or more kinds of sheds being alternately and repeatedly arranged (see JP2002-329433A, pages 2 to 3, Figs. 1 to 11).
  • the above-described known structure can reduce noise when air is flowing parallel to the sheds of the electrical insulator.
  • the airflow has a velocity in the vertical direction and does not flow parallel to the sheds when seen from the side, separation of the airflow occurs at the sheds and an upper metal part of the electrical insulator, and noise is generated accordingly.
  • a structural component is placed on top of the electrical insulator, turbulent airflow is caused by the structural component and noise is generated when the turbulent airflow hits a shed.
  • the electrical insulator is provided with upper and lower metal parts having smooth surfaces, and the velocity of the airflow is increased on the smooth surfaces. Then, a large degree of airflow separation and periodic vortex shedding occur, and noise is generated accordingly.
  • Fig. 11 is a side view showing an airflow field around an electrical insulator of prior arts obtained by numerical simulation.
  • Fig. 12 is a perspective view showing an airflow field around an actual electrical insulator for a current collector obtained by numerical simulation.
  • the electrical insulator includes a column 21 for supporting a collector shoe on the electrical insulator, a conductor cable, etc.
  • the main factors that cause the noise are the separation of the airflow at the front and the collision of the vortices generated at positions downstream of a structural component placed on top of the electrical insulator with other members.
  • An object of the present invention is to provide an electrical insulator which can reduce noise even when the airflow has a vertical velocity relative to the electrical insulator.
  • an electrical insulator includes a shed having a diameter larger than the shed diameter of the electrical insulator in an upper portion of the electrical insulator.
  • an electrical insulator having an upper metal part includes a shed having a diameter larger than the shed diameter of the electrical insulator in an upper portion of the electrical insulator, the shed being integrated with the upper metal part.
  • the shed may have an elliptical or oval cross section.
  • the shed may also have a circular cross section.
  • an electrical insulator having an upper metal part and a lower metal part includes one or more sheds on the surface of at least one of the upper metal part and the lower metal part.
  • an electrical insulator having an upper metal part and a lower metal part includes at least two kinds of sheds having different diameters on the surface of at least one of the upper metal part and the lower metal part.
  • each of the sheds may have an elliptical or oval cross section.
  • each of the sheds may also have a circular cross section.
  • the airflow in the vertical direction of the electrical insulator is reduced.
  • an electrical insulator has an elliptical or oval cross section and includes an elliptical or oval shed with a diameter larger than the shed diameter of the electrical insulator in an upper portion of the electrical insulator.
  • the electrical insulator includes an upper metal part in the upper portion of the electrical insulator and a lower metal part in a lower portion of the electrical insulator, and the upper and lower metal parts are provided with two or more kinds of sheds having different shed diameters.
  • the shed with the elliptical or oval cross section provided in the upper portion of the electrical insulator may be integrated with the upper metal part.
  • Fig. 1 is a sectional view showing the structure of an electrical insulator according to a first embodiment of the present invention
  • Fig. 2 is a side view of the electrical insulator.
  • An electrical insulator 1 includes a splitter plate 31 on the top surface of an upper metal part 2, the splitter plate 31 defining a shed with a diameter larger than the shed diameter of the electrical insulator 1.
  • the splitter plate 31 has an elliptical or oval cross section and is substantially streamlined so that airflow turbulence is minimized and the splitter plate 31 does not generate aerodynamic noise by itself.
  • Fig. 3 is a top view of the electrical insulator according to the first embodiment of the present invention. Since the splitter plate 31 has a diameter larger than the shed diameter of the electrical insulator 1, only the splitter plate 31 can be viewed from above.
  • Fig. 4 is a side view showing an airflow according to the first embodiment. Due to the shape of the splitter plate 31, upward airflow at the front of the electrical insulator 1 is reduced and the airflow is substantially parallel to the sheds. Thus, the airflow separation in the front region of a shed of the electrical insulator 1 is suppressed. As a result, pressure fluctuation on the surface, which is the cause of noise, is reduced and the noise is reduced accordingly.
  • Fig. 5 is a perspective view showing the airflow according to the first embodiment. Since the splitter plate 31 is provided, the airflow in the vertical direction is reduced. Accordingly, the pressure fluctuation caused by the airflow separation in the front region of the electrical insulator 1 is also reduced. Although vortices 103 are generated by a column 21 for supporting a collector shoe and flow downstream, they do not move downward since the vertical airflow is reduced. Accordingly, the pressure fluctuation caused by the vortices 103 on the shed of the electrical insulator 1 is reduced.
  • Fig. 6 is a sectional view showing the structure of an electrical insulator according to a second embodiment of the present invention as seen from the front.
  • the splitter plate 31 having a diameter larger than the shed diameter of the electrical insulator 1 is provided on the top surface of the upper metal part 2.
  • a ring-shaped splitter plate 31 is fitted around an upper metal part 2.
  • the pressure fluctuation on the surface which is the cause of aerodynamic noise, is reduced and the noise is reduced accordingly.
  • Fig. 9 is a diagram showing the result of wind tunnel tests for measuring the noise caused by the electrical insulators according to the first to third embodiments of the present invention.
  • the noise is largely reduced in a frequency range of 200 Hz or more when the splitter plate is provided.
  • Fig. 7 is a sectional view showing the structure of an electrical insulator according to a third embodiment of the present invention as seen from the front, and Fig. 8 is a side view of the electrical insulator.
  • the moving direction is shown by A.
  • the third embodiment is different from the first embodiment in that an upper metal part 2 and a lower metal part 3 of an electrical insulator 1 are provided with two or more kinds of sheds 41a to 42d having different shed diameters and elliptical or oval cross sections.
  • the upper metal part 2 and the lower metal part 3, which are exposed to the airflow, have side surfaces with smooth, uniform cross sections. Accordingly, Karman vortices are generated due to velocity shear layers at boundaries between the main flow and separation regions on the smooth surfaces, and this is considered to generate Aeolian tones.
  • vent holes in the electrical insulator 1 since a conductor cable and the like are disposed in the electrical insulator 1.
  • the sheds 41a to 42d are provided on the upper metal part 2 and the lower metal part 3 so as to suppress the airflow-accelerating function of the metal part surfaces and to control the separation of the airflow from the surfaces of the metal parts 2 and 3.
  • vortex areas at the downstream are controlled and the vortex diameters are reduced. It is not necessary that the sheds 41a to 42d on the metal parts 2 and 3 be electrically insulative.
  • aerodynamic noise caused by the upper metal part and the lower metal part is reduced and noise generated by the overall body of the electrical insulator is reduced accordingly.
  • Fig. 10 is a top view of an electrical insulator according to a fourth embodiment of the present invention.
  • the fourth embodiment is different from the above-described first to third embodiment in that a splitter plate 31 and sheds provided on an upper metal part 2 and a lower metal part 3 of an electrical insulator have circular cross sections. Also in this case, noise can be reduced similar to the first to third embodiments.
  • the electrical insulator according to the fourth embodiment which is provided with the sheds having circular cross sections has no directionality in cross section, and accordingly the application thereof is not limited to current collectors for high-velocity railway vehicles. More specifically, when the electrical insulator according to the fourth embodiment is used in transmission towers which receive strong wind of typhoon or snowstorm, sea wind, etc., it can reduce noise caused by wind blowing from any direction in cross section.

Landscapes

  • Insulators (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
EP04025657A 2003-10-28 2004-10-28 Elektrischer Isolator Withdrawn EP1528576A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003367240A JP4332718B2 (ja) 2003-10-28 2003-10-28 絶縁碍子
JP2003367240 2003-10-28

Publications (2)

Publication Number Publication Date
EP1528576A2 true EP1528576A2 (de) 2005-05-04
EP1528576A3 EP1528576A3 (de) 2006-02-01

Family

ID=34420122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04025657A Withdrawn EP1528576A3 (de) 2003-10-28 2004-10-28 Elektrischer Isolator

Country Status (2)

Country Link
EP (1) EP1528576A3 (de)
JP (1) JP4332718B2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104590030A (zh) * 2014-12-12 2015-05-06 株洲鼎顺新材料科技有限公司 一种电力机车车顶的母线支柱和受电弓支柱瓷质绝缘子
CN107946005A (zh) * 2017-05-27 2018-04-20 国网新疆电力公司经济技术研究院 一种应用于强风区的抗风复合绝缘子
DE102019121932A1 (de) * 2019-08-14 2021-02-18 Bombardier Transportation Gmbh Isolator für ein Schienenfahrzeug und Stromabnehmer
CN114551013A (zh) * 2022-02-24 2022-05-27 南京理工大学 减阻降噪型绝缘子及具有其的高速列车受电弓

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104269235A (zh) * 2014-10-17 2015-01-07 王玉华 电力机车、动车组专用对角棱柱体防污闪绝缘子

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR594268A (fr) * 1924-03-05 1925-09-09 Porcelainfabrikken Norden As Isolateur électrique pour haute tension
DE1093844B (de) * 1959-03-20 1960-12-01 Siemens Ag Isolator, insbesondere Stuetzisolator aus glasfaserverstaerktem Giessharz
FR2133473A1 (en) * 1971-04-14 1972-12-01 Gratzmuller J Power line insulator - formed from assembly of moulded synthetic resin insulator elements
FR2604821B1 (fr) * 1986-10-02 1990-01-12 Ceraver Isolateur composite a revetement isolant surmoule

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104590030A (zh) * 2014-12-12 2015-05-06 株洲鼎顺新材料科技有限公司 一种电力机车车顶的母线支柱和受电弓支柱瓷质绝缘子
CN107946005A (zh) * 2017-05-27 2018-04-20 国网新疆电力公司经济技术研究院 一种应用于强风区的抗风复合绝缘子
DE102019121932A1 (de) * 2019-08-14 2021-02-18 Bombardier Transportation Gmbh Isolator für ein Schienenfahrzeug und Stromabnehmer
DE102019121932B4 (de) 2019-08-14 2024-11-21 Bombardier Transportation Gmbh Isolator für ein Schienenfahrzeug und Stromabnehmer
CN114551013A (zh) * 2022-02-24 2022-05-27 南京理工大学 减阻降噪型绝缘子及具有其的高速列车受电弓
CN114551013B (zh) * 2022-02-24 2024-06-18 南京理工大学 减阻降噪型绝缘子及具有其的高速列车受电弓

Also Published As

Publication number Publication date
JP4332718B2 (ja) 2009-09-16
EP1528576A3 (de) 2006-02-01
JP2005135602A (ja) 2005-05-26

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