EP1528576A2 - Electrical insulator - Google Patents

Electrical insulator Download PDF

Info

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Withdrawn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
German (de)
French (fr)
Other versions
EP1528576A3 (en
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/en
Publication of EP1528576A3 publication Critical patent/EP1528576A3/en
Withdrawn legal-status Critical Current

Links

Images

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)

Abstract

An electrical insulator (1) includes a shed (31) having a diameter larger than the shed diameter of the electrical insulator (1) in an upper portion of the electrical insulator (1), and the shed (31) has an elliptical or oval cross section. Accordingly, the airflow in the vertical direction of the electrical insulator (1) is reduced, and therefore the noise caused by pressure fluctuation on a shed of the electrical insulator (1) due to vortices generated at positions downstream of a structural component, such as a collector shoe, placed on top of the electrical insulator (1) is reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention
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.
2. Description of the Related Art
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.
In view of the above, 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.
Japanese Unexamined Patent Application Publication 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.
However, when 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. In addition, if 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. In addition, 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.
In the electrical insulator of prior arts, an upward airflow which tries to go over an upper portion of the electrical insulator is generated, and separation of the airflow from the surface of the electrical insulator occurs in front regions 101 and 102 of a shed and an upper metal part, respectively. Accordingly, a large pressure fluctuation occurs on the surface. The cause of aerodynamic noise is considered to be a pressure fluctuation on the surface of an object when the airflow velocity is below the sonic velocity, and therefore the above-described regions in which large pressure fluctuation occurs due to the separation of the airflow serve as large noise sources.
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.
Similar to the electrical insulator without a structural component placed on top, separation of the airflow occurs in front regions 104 and 105 of a shed and an upper metal part, respectively, of the electrical insulator. In addition, vortices 103 generated by the column 21 for supporting the collector shoe move downward as they flow downstream since the main flow around the electrical insulator is downward, and cause a large pressure fluctuation on the upper metal part and a shed of the electrical insulator.
Accordingly, in the known electrical insulator, 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.
Both of the above-described factors are caused by the vertical airflow, and accordingly the noise can be reduced by suppressing the vertical airflow.
SUMMARY OF THE INVENTION
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.
In order to attain this object, according to one aspect of the present invention, 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.
In addition, according to another aspect of the present invention, 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.
In the above-described electrical insulators, the shed may have an elliptical or oval cross section.
Alternatively, in the above-described electrical insulators, the shed may also have a circular cross section.
In addition, in order to attain the above-described object, according to still another aspect of the present invention, 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.
In addition, according to still another aspect of the present invention, 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.
In the above-described electrical insulators, each of the sheds may have an elliptical or oval cross section.
Alternatively, in the above-described electrical insulators, each of the sheds may also have a circular cross section.
According to the present invention, since a shed having a diameter larger than the shed diameter of the electrical insulator is provided on the upper portion of the electrical insulator, the airflow in the vertical direction of the electrical insulator is reduced.
In addition, when the above-described shed is provided, pressure fluctuation on a shed of the electrical insulator due to vortices generated at positions downstream of a structural component, such as a collector shoe, placed on top of the electrical insulator is suppressed.
In addition, since all of the portions, such as the upper metal part and the lower metal part, that are exposed to the airflow are provided with sheds in addition to the insulating portion of the electrical insulator, acceleration of the airflow on the surface is suppressed and the positions of airflow separation from the surface are shifted downstream. As a result, aerodynamic noise from the electrical insulator is reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is a sectional view showing the structure of an electrical insulator according to a first embodiment of the present invention as seen from the front;
  • Fig. 2 is a side view of the electrical insulator according to the first embodiment of the present invention;
  • Fig. 3 is a top view of the electrical insulator according to the first embodiment of the present invention;
  • Fig. 4 is a side view showing an airflow according to the first embodiment;
  • Fig. 5 is a perspective view showing the airflow according to the first embodiment;
  • 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;
  • 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;
  • Fig. 8 is a side view of the electrical insulator according to the third embodiment of the present invention;
  • 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;
  • Fig. 10 is a top view of an electrical insulator according to a fourth embodiment of the present invention;
  • Fig. 11 is a side view showing an airflow field around a known electrical insulator obtained by numerical simulation; and
  • 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 including a column for supporting a collector shoe on the electrical insulator, a conductor cable, etc.
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS
    According to the present invention, 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.
    In addition, 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.
    First Embodiment
    Fig. 1 is a sectional view showing the structure of an electrical insulator according to a first embodiment of the present invention, and Fig. 2 is a side view of the electrical insulator.
    The moving direction is shown by A. 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.
    Second Embodiment
    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.
    In the first embodiment, 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. In comparison, in the second embodiment, a ring-shaped splitter plate 31 is fitted around an upper metal part 2.
    Similar to the first embodiment, also in the second embodiment, 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.
    In each embodiment, the noise is largely reduced in a frequency range of 200 Hz or more when the splitter plate is provided.
    Third Embodiment
    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.
    A structure for reducing the Aeolian tones by providing vent holes in the direction of the airflow is disclosed in Japanese Unexamined Patent Application Publication No. 6-311605.
    However, it is difficult to form vent holes in the electrical insulator 1 since a conductor cable and the like are disposed in the electrical insulator 1.
    Accordingly, in the third embodiment, 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. Thus, 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.
    According to the third embodiment, 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.
    As shown in Fig. 9, when the upper metal part 2 and the lower metal part 3 according to the third embodiment are provided, noise is reduced in a frequency range around 630 Hz.
    Fourth Embodiment
    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.

    Claims (8)

    1. An electrical insulator (1) characterized by comprising a shed (31) having a diameter larger than the shed diameter of the electrical insulator (1) in an upper portion of the electrical insulator (1).
    2. An electrical insulator (1) having an upper metal part (2), characterized by comprising a shed (31) having a diameter larger than the shed diameter of the electrical insulator (1) in an upper portion of the electrical insulator (1), the shed (31) being integrated with the upper metal part (2).
    3. The electrical insulator (1) according to one of Claims 1 and 2, wherein the shed (31) has an elliptical or oval cross section.
    4. The electrical insulator (1) according to one of Claims 1 and 2, wherein the shed (31) has a circular cross section.
    5. An electrical insulator (1) having an upper metal part (2) and a lower metal part (3), characterized by comprising one or more sheds (41a, 41b, 42a, 42b, 42c, 42d) on the surface of at least one of the upper metal part (2) and the lower metal part (3).
    6. An electrical insulator (1) having an upper metal part (2) and a lower metal part (3), characterized by comprising at least two kinds of sheds (41a, 41b, 42a, 42b, 42c, 42d) having different diameters on the surface of at least one of the upper metal part (2) and the lower metal part (3).
    7. An electrical insulator (1) according to one of Claims 5 and 6, wherein each of the sheds (41a, 41b, 42a, 42b, 42c, 42d) has an elliptical or oval cross section.
    8. An electrical insulator (1) according to one of Claims 5 and 6, wherein each of the sheds (41a, 41b, 42a, 42b, 42c, 42d) has a circular cross section.
    EP04025657A 2003-10-28 2004-10-28 Electrical insulator Withdrawn EP1528576A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    JP2003367240 2003-10-28
    JP2003367240A JP4332718B2 (en) 2003-10-28 2003-10-28 Insulator

    Publications (2)

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

    Family

    ID=34420122

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP04025657A Withdrawn EP1528576A3 (en) 2003-10-28 2004-10-28 Electrical insulator

    Country Status (2)

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

    Cited By (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN104590030A (en) * 2014-12-12 2015-05-06 株洲鼎顺新材料科技有限公司 Bus brace and pantograph brace porcelain insulator on roof of electric locomotive
    CN107946005A (en) * 2017-05-27 2018-04-20 国网新疆电力公司经济技术研究院 A kind of wind resistance composite insulator applied to strong wind area
    DE102019121932A1 (en) * 2019-08-14 2021-02-18 Bombardier Transportation Gmbh Insulator for a rail vehicle and pantograph
    CN114551013A (en) * 2022-02-24 2022-05-27 南京理工大学 Anti-drag noise-reduction insulator and high-speed train pantograph with same

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN104269235A (en) * 2014-10-17 2015-01-07 王玉华 Opposite angular edge pillar anti-pollution-flashover insulator special for electric locomotives and motor train units

    Family Cites Families (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR594268A (en) * 1924-03-05 1925-09-09 Porcelainfabrikken Norden As Electrical insulator for high voltage
    DE1093844B (en) * 1959-03-20 1960-12-01 Siemens Ag Insulator, in particular support insulator made of glass fiber reinforced cast resin
    FR2133473A1 (en) * 1971-04-14 1972-12-01 Gratzmuller J Power line insulator - formed from assembly of moulded synthetic resin insulator elements
    FR2604821B1 (en) * 1986-10-02 1990-01-12 Ceraver COMPOSITE INSULATOR WITH OVER-MOLDED INSULATING COATING

    Cited By (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN104590030A (en) * 2014-12-12 2015-05-06 株洲鼎顺新材料科技有限公司 Bus brace and pantograph brace porcelain insulator on roof of electric locomotive
    CN107946005A (en) * 2017-05-27 2018-04-20 国网新疆电力公司经济技术研究院 A kind of wind resistance composite insulator applied to strong wind area
    DE102019121932A1 (en) * 2019-08-14 2021-02-18 Bombardier Transportation Gmbh Insulator for a rail vehicle and pantograph
    DE102019121932B4 (en) 2019-08-14 2024-11-21 Bombardier Transportation Gmbh Insulator for a rail vehicle and pantograph
    CN114551013A (en) * 2022-02-24 2022-05-27 南京理工大学 Anti-drag noise-reduction insulator and high-speed train pantograph with same
    CN114551013B (en) * 2022-02-24 2024-06-18 南京理工大学 Resistance-reducing noise-reducing insulator and high-speed train pantograph with same

    Also Published As

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

    Similar Documents

    Publication Publication Date Title
    KR101794780B1 (en) Railway vehicle and method of manufacturing the same
    EP1528576A2 (en) Electrical insulator
    CA2692403C (en) Vibration resistant cable
    CN113471657A (en) Antenna device
    JP3374469B2 (en) Current collector
    US3296357A (en) Device to prevent vibration of aerial conductors
    JP2004036271A (en) Bridge
    JPH09266604A (en) Low noise hull for pantograph of high speed vehicle
    JP3873184B2 (en) Windproof cover for current collector
    JPH09205702A (en) Single arm type pantograph
    JP2877121B2 (en) Current collector sound insulation device
    JP2881632B2 (en) Current collector support
    JP3630419B1 (en) Windshield cover device for current collector in vehicle
    JP3640192B2 (en) Insulator
    JPH04103494A (en) Turbulence restraining device
    JP4286759B2 (en) Cover device for vehicle roof projections
    JP3503267B2 (en) Electric insulator for vehicles
    JP2007176192A (en) Noise barrier for railway vehicles
    CN115102364B (en) A permanent magnet eddy current brake
    JPH08126109A (en) Pantograph cover having streamline body
    JPH0718627A (en) Vibration control cable-stayed bridge cable
    JP2002320301A (en) Noise reduction cover
    JP4997296B2 (en) Rectifying cover
    CN120798063A (en) Windbreak wall components
    JPH09182206A (en) Current collector sound insulation device

    Legal Events

    Date Code Title Description
    PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

    Free format text: ORIGINAL CODE: 0009012

    AK Designated contracting states

    Kind code of ref document: A2

    Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

    AX Request for extension of the european patent

    Extension state: AL HR LT LV MK

    PUAL Search report despatched

    Free format text: ORIGINAL CODE: 0009013

    AK Designated contracting states

    Kind code of ref document: A3

    Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

    AX Request for extension of the european patent

    Extension state: AL HR LT LV MK

    17P Request for examination filed

    Effective date: 20060613

    AKX Designation fees paid

    Designated state(s): DE FR GB

    17Q First examination report despatched

    Effective date: 20090709

    STAA Information on the status of an ep patent application or granted ep patent

    Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

    18D Application deemed to be withdrawn

    Effective date: 20091120