EP0493134A1 - Lightning arresting insulator - Google Patents
Lightning arresting insulator Download PDFInfo
- Publication number
- EP0493134A1 EP0493134A1 EP91312070A EP91312070A EP0493134A1 EP 0493134 A1 EP0493134 A1 EP 0493134A1 EP 91312070 A EP91312070 A EP 91312070A EP 91312070 A EP91312070 A EP 91312070A EP 0493134 A1 EP0493134 A1 EP 0493134A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insulating cylinder
- insulator
- lightening
- housing
- current
- 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.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/15—Details of spark gaps for protection against excessive pressure
Definitions
- the present invention relates to a lightening arresting insulator, and more specifically, to a lightening arresting insulator which discharges a lightening induced surge currents in power transmission lines to the ground.
- the insulator suppresses or cuts of the follow current of the surge arrestor to prevent ground faults.
- a conventional lightening arresting insulators of this type is disclosed in Japanese Patent Publication No. 61-151913 (see Fig. 6) and in Japanese Utility Model Publication No. 1-96739 (see Fig. 7).
- the lightening arresting insulator 60 disclosed in Japanese Patent Publication No. 61-151913 is designed so that electrodes 51 and 52 for the ground side and applied voltage side are securely coupled to the respective ends of an insulating cylinder 50.
- Current-limiting varistors 53 with nonlinear voltage-current characteristics are retained in the insulating cylinder 50.
- the electrodes 51 and 52 are electrically connected at their ends to the respective ends of the current-limiting varistors 53.
- a housing 55 having a plurality of sheds 54 is formed on the outer wall of the insulating cylinder 50.
- a plurality of pressure-release holes 56 are made in the inner surface of the insulating cylinder 50. In forming the housing 55, an insulating material is injected through the pressure-release holes 56 to form an inner housing wall 57.
- pin holes may infrequently be made in the housing 55 and in the insulating materials that fill the pressure-release holes 56. At times, the pin holes will reaching the current-limiting elements 53, which permits moisture from the ambient air to contact the varistor stack. This deteriorates the dielectric or insulating strength of the lightening arresting insulator.
- the lightening arresting insulator 110 in Japanese Utility Model Publication No. 1-96739 is designed so that electrodes 101 and 102 for the ground side and applied voltage side respectively, are securely coupled to the respective ends of an insulating tube 100 having a plurality of resin sheds.
- the insulating tube 100 contains a plurality of current-limiting varistors 105 having nonlinear voltage-current characteristics.
- the electrodes 101 and 102 are electrically connected at their ends to the respective ends of the current-limiting varistor stack 105.
- the insulating tube 100 has a plurality of recesses 103 formed in the outer wall, thereby providing thin wall portions 104 for releasing pressure.
- the lightening arresting insulator 110 does not require an insulating cylinder and comprises only the insulating tube 100 which has the thin pressure-releasing wall portions 104 formed on the outer surface.
- extended use of a lightening arresting insulator with this structure under severe dirt conditions will weaken the surface of the insulating tube 100 due to corrosion caused by current leaks and corona discharge. Accordingly, cracks or pin holes will develop, which may extend entirely through the thin wall portions. Under such a situation, the humidity will enter inside through the cracks or the pin holes, deteriorating the dielectric or insulating strength of the lightening arresting insulator 110.
- thie lightening arresting insulator 110 has the thin wall portions exposed through the outer surface of the insulating tube 100. In the manufacturing process, therefore, workers may accidentally hit the thin wall portions with tools or the like, breaking the insulating tube 100. Or, while the lightening arresting insulator is in use, birds may peck at the thin wall portions, damaging the insulating tube 100. Furthermore, dirt or the like may be deposited in the recesses 103 that are forming the thin wall portions 104, thereby deteriorating the dielectric or insulating strength of the lightening arresting insulator.
- a lightening arresting insulator with a pressure-release mechanism for releasing pressure when a lightening surge flows in a power transmission line is provided.
- the arresting insulator has a plurality of slits formed in the outer wall of an insulating cylinder formed from a material having a high voltage resistance.
- the slits extend lengthwise to form thin wall portions in the insulating cylinder.
- An elastic insulator is filled in each of the slits.
- an insulating cylinder 1 is formed of a durable reinforced resin having excellent weathering resistance.
- One suitable resin is epoxy resin-impregnated FRP (fiber reinforced plastics).
- An electrode 2 on the ground side is securely fitted over the top end of the insulating cylinder 1, and a flange 3 is integrally formed on the outer wall of the electrode 2.
- the lightening arresting insulator is attached to an adaptor provided on the cross arm of a transmission tower (not shown).
- An electrode 4 having a cylindrical bottom on the applied voltage side is securely fitted into the bottom end of the insulating cylinder 1.
- a bracket 5 is integrally and protrusively formed on the bottom surface.
- An arching horn (not shown) on the ground side is attached to the bracket 5 in such a way that the arching horn faces an arching horn on the applied voltage side, with a given air gap therebetween.
- a rim 6 is formed on the inner top surface of the electrode 4.
- a conductor 7 on the applied voltage side is fitted into the rim 6.
- Current-limiting varistors 8 essentially made of zinc oxide having a nonlinear voltage-current characteristic are stacked in series on the upper surface of the conductor 7 on the applied voltage side.
- a conductor 9 on the ground side is provided on the upper surface of the topmost current-limiting varistor 8, and also serves as a spring receiver.
- a ring 10 is screwed into a threaded portion 11 on the inner wall of the upper end of the electrode 2 on the ground side.
- a coil spring 14 having a conductive foil 13 is inserted between a conductor 12 fitted into the ring 10 and the conductor 9 on the ground side. The coil spring 14 urges the current-limiting varistors 8 to be securely pressed between the conductors 7 and 9 respectively on the applied voltage side and the ground side.
- An insulating cap 15 is fitted over the top end of the electrode 2 on the ground side to seal the upper opening of the electrode 2.
- An insulating layer 16 is formed in the sealed space between the insulating cylinder 1 and the current-limiting varistors 8. According to this embodiment, room-temperature thermosetting silicone rubber is filled in that space to form the insulating layer 16.
- a plurality of slits 17, are provided on the outer wall of the insulating cylinder 1 such that they extend in the axial direction of the insulating cylinder 1.
- the reason why the slits are provided at two locations is that this is the minimum number of slits required in view of the operating specifications of the arrestor. Specifically, the accident current and the current flowing time permitted to discharge the voltage.
- This slit arrangement may differ depending on the above conditions.
- the insulating cylinder 1 will be easily torn and less durable.
- the number of the locations of the slits on the outer wall of the insulating cylinder 1, and the number of the slits aligned in the axial direction depend on the pressure-releasing conditions. It is therefore important not to make the slit gaps too narrow.
- the slits 17 are thus made to provide thin wall portions 18 for releasing pressure on the surface of the insulating cylinder 1.
- an elastic insulator 19 in the form of a room-temperature thermosetting rubber, is filled in each slit 17.
- the housing 20 made of the high temperature thermosetting silicone rubber, the lightening arresting insulator can keep the water-repellent property while in use outside for a long period of time. Compared with other cover materials, such as of EPDM or resins, the dirt withstanding characteristics of the lightening arresting insulator can be improved without changing the length of the housing 20 (which corresponds to the surface leak distance).
- the housing 20 has a plurality of sheds 21 formed on the outer wall. The upper and lower ends of the housing 20 extend to the outer surfaces of the electrodes 2 and 4 on the ground side and applied voltage side, respectively, thus ensuring the airtight condition between the housing 20 and the electrodes 2 and 4.
- a lightening surge current flows through a power-transmission line with the lightening arresting insulator attached to the cross arm of a transmission tower.
- the current starts to be discharged (flash-over) from arching horns (not shown) on the power-transmission line to arching horns or series gaps (also not shown) attached to the lower end of the lightening arresting insulator.
- the current runs through the electrode 4, the conductive fixture 7, the current-limiting varistors 8, the conductor 9, the foil 13, the conductor 12, the ring 10 to the elctrode 2.
- the lightening surge current finally runs to the transmission tower through the adaptor (not shown) to be discharged to the ground.
- a follow current which follows is limited and then interrupted by the series gaps and the current-limiting varistors elements 8.
- the current-limiting elements 8 are rendered conductive, and then a current flows through the lightening arresting insulator in response to a drive voltage, thus generating a high-temperature and high-pressure gas arc inside the lightening arresting insulator.
- the gas arc is transmitted to the thin wall portions 18 through the insulating layer 16 in the sealed space between the insulating cylinder 1 and the current-limiting elements 8.
- the gas arc is then rapidly released outside through the thin-wall portions 18 and part of the housing 20.
- the lightening arresting insulator will not therefore be damaged as a whole.
- a plurality of slits 17 are provided in the outer surface of the insulating cylinder 1 to form the pressure-releasing thin wall portions 18.
- the thin wall portions 18 can suppress water from passing therethrough so that the airtight condition inside the insulating cylinder 1 can be kept.
- the lightening arresting insulator according to this embodiment has a rubbery elastic insulator 19 in the slits 17 on the outer wall of the insulating cylinder 1. Because of the elastic insulator 19, the thin wall portions 18 are not exposed directly through the outer wall of the insulating cylinder 1.
- the lightening arresting insulator in this embodiment differs from the conventional from arresting insulators which do not have an insulating cylinder but rather have thin wall portions formed on the outer surface of the insulating tube of a polymer material. More specifically, the thin wall portions 18 of the lightening arresting insulator according to this embodiment will not be hit by tools or the like in the manufacturing process so are unlikely to be damaged or broken by such an accident.
- the slits 17 can be easily formed in the outer wall of the insulating cylinder 1 through post fabrication working.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Insulators (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
- The present invention relates to a lightening arresting insulator, and more specifically, to a lightening arresting insulator which discharges a lightening induced surge currents in power transmission lines to the ground. The insulator suppresses or cuts of the follow current of the surge arrestor to prevent ground faults.
- A conventional lightening arresting insulators of this type, is disclosed in Japanese Patent Publication No. 61-151913 (see Fig. 6) and in Japanese Utility Model Publication No. 1-96739 (see Fig. 7).
- The
lightening arresting insulator 60 disclosed in Japanese Patent Publication No. 61-151913 is designed so thatelectrodes insulating cylinder 50. Current-limiting varistors 53 with nonlinear voltage-current characteristics are retained in the insulatingcylinder 50. Theelectrodes limiting varistors 53. Ahousing 55 having a plurality ofsheds 54 is formed on the outer wall of the insulatingcylinder 50. A plurality of pressure-release holes 56 are made in the inner surface of the insulatingcylinder 50. In forming thehousing 55, an insulating material is injected through the pressure-release holes 56 to form aninner housing wall 57. - In the manufacturing process for the
lightening arresting insulator 60, however, pin holes may infrequently be made in thehousing 55 and in the insulating materials that fill the pressure-release holes 56. At times, the pin holes will reaching the current-limitingelements 53, which permits moisture from the ambient air to contact the varistor stack. This deteriorates the dielectric or insulating strength of the lightening arresting insulator. - The
lightening arresting insulator 110 in Japanese Utility Model Publication No. 1-96739 is designed so thatelectrodes insulating tube 100 having a plurality of resin sheds. Theinsulating tube 100 contains a plurality of current-limiting varistors 105 having nonlinear voltage-current characteristics. Theelectrodes varistor stack 105. Theinsulating tube 100 has a plurality ofrecesses 103 formed in the outer wall, thereby providingthin wall portions 104 for releasing pressure. - The lightening arresting
insulator 110 does not require an insulating cylinder and comprises only theinsulating tube 100 which has the thin pressure-releasingwall portions 104 formed on the outer surface. However, extended use of a lightening arresting insulator with this structure under severe dirt conditions will weaken the surface of theinsulating tube 100 due to corrosion caused by current leaks and corona discharge. Accordingly, cracks or pin holes will develop, which may extend entirely through the thin wall portions. Under such a situation, the humidity will enter inside through the cracks or the pin holes, deteriorating the dielectric or insulating strength of thelightening arresting insulator 110. - Further, thie
lightening arresting insulator 110 has the thin wall portions exposed through the outer surface of theinsulating tube 100. In the manufacturing process, therefore, workers may accidentally hit the thin wall portions with tools or the like, breaking theinsulating tube 100. Or, while the lightening arresting insulator is in use, birds may peck at the thin wall portions, damaging theinsulating tube 100. Furthermore, dirt or the like may be deposited in therecesses 103 that are forming thethin wall portions 104, thereby deteriorating the dielectric or insulating strength of the lightening arresting insulator. - It is therefore an object of the present invention to provide an improved airtight lightening arresting insulator which prevents humidity in the air from entering therein. This It is another object of the present invention to provide a lightening arresting insulator whose dielectric or insulating strength is prevented from substantially decreasing while in use.
- It is a still further object of the present invention to provide a lightening arresting insulator whose pressure-releasing portions are not likely to be damaged during manufacturing or usage.
- According to the present invention, a lightening arresting insulator with a pressure-release mechanism for releasing pressure when a lightening surge flows in a power transmission line is provided. The arresting insulator has a plurality of slits formed in the outer wall of an insulating cylinder formed from a material having a high voltage resistance. The slits extend lengthwise to form thin wall portions in the insulating cylinder. An elastic insulator is filled in each of the slits.
- The invention, together with the objects and advantages thereof, may be best understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
- Fig. 1 is a cross sectional view of a portion of a lightening arresting insulator according to one embodiment of the present invention;
- Fig. 2 is a partial cross section view showing the whole lightening arresting insulator;
- Fig. 3 is a partially cutaway perspective view of the insulating body of the lightening arresting insulator;
- Fig. 4 is a cross sectional view of the lightening arresting insulator taken along the line A-A in Fig. 2;
- Fig. 5 is a partially cutaway view in perspective of the insulating body of a lightening arresting insulator according to a second embodiment of the invention;
- Fig. 6 is a cross sectional view showing a conventional lightening arresting insulator; and
- Fig. 7 is a partial cross sectional view of another conventional lightening arresting insulator.
- One preferred embodiment of the present invention will now be described referring to Figs. 1 to 5.
- As shown in Fig. 2, an insulating cylinder 1 is formed of a durable reinforced resin having excellent weathering resistance. One suitable resin is epoxy resin-impregnated FRP (fiber reinforced plastics). An
electrode 2 on the ground side is securely fitted over the top end of the insulating cylinder 1, and aflange 3 is integrally formed on the outer wall of theelectrode 2. Through theflange 3, the lightening arresting insulator is attached to an adaptor provided on the cross arm of a transmission tower (not shown). - An electrode 4 having a cylindrical bottom on the applied voltage side is securely fitted into the bottom end of the insulating cylinder 1. A bracket 5 is integrally and protrusively formed on the bottom surface. An arching horn (not shown) on the ground side is attached to the bracket 5 in such a way that the arching horn faces an arching horn on the applied voltage side, with a given air gap therebetween.
- A rim 6 is formed on the inner top surface of the electrode 4. A
conductor 7 on the applied voltage side is fitted into the rim 6. Current-limitingvaristors 8 essentially made of zinc oxide having a nonlinear voltage-current characteristic are stacked in series on the upper surface of theconductor 7 on the applied voltage side. Aconductor 9 on the ground side is provided on the upper surface of the topmost current-limitingvaristor 8, and also serves as a spring receiver. - A
ring 10 is screwed into a threadedportion 11 on the inner wall of the upper end of theelectrode 2 on the ground side. Acoil spring 14 having aconductive foil 13 is inserted between aconductor 12 fitted into thering 10 and theconductor 9 on the ground side. Thecoil spring 14 urges the current-limitingvaristors 8 to be securely pressed between theconductors - An insulating cap 15, is fitted over the top end of the
electrode 2 on the ground side to seal the upper opening of theelectrode 2. Aninsulating layer 16 is formed in the sealed space between the insulating cylinder 1 and the current-limitingvaristors 8. According to this embodiment, room-temperature thermosetting silicone rubber is filled in that space to form the insulatinglayer 16. - As shown in Figs. 1 to 4, a plurality of
slits 17, (two sets of three slits in this case), are provided on the outer wall of the insulating cylinder 1 such that they extend in the axial direction of the insulating cylinder 1. The reason why the slits are provided at two locations is that this is the minimum number of slits required in view of the operating specifications of the arrestor. Specifically, the accident current and the current flowing time permitted to discharge the voltage. This slit arrangement may differ depending on the above conditions. With the insulating cylinder 1 having the same thickness, as the number of slit locations on the outer surface increases, pressure will be smoothly released at the price of decreased strength of the insulating cylinder 1. If the gaps between theslits 17 are narrowed to increase the number of slits in the axial direction, the insulating cylinder 1 will be easily torn and less durable. In other words, the number of the locations of the slits on the outer wall of the insulating cylinder 1, and the number of the slits aligned in the axial direction depend on the pressure-releasing conditions. It is therefore important not to make the slit gaps too narrow. Theslits 17 are thus made to providethin wall portions 18 for releasing pressure on the surface of the insulating cylinder 1. In this embodiment, anelastic insulator 19 in the form of a room-temperature thermosetting rubber, is filled in each slit 17. - A
housing 20, formed from a high temperature thermosetting silicone rubber, is coated on the outer surface of the insulating body 1. With thehousing 20 made of the high temperature thermosetting silicone rubber, the lightening arresting insulator can keep the water-repellent property while in use outside for a long period of time. Compared with other cover materials, such as of EPDM or resins, the dirt withstanding characteristics of the lightening arresting insulator can be improved without changing the length of the housing 20 (which corresponds to the surface leak distance). Thehousing 20 has a plurality ofsheds 21 formed on the outer wall. The upper and lower ends of thehousing 20 extend to the outer surfaces of theelectrodes 2 and 4 on the ground side and applied voltage side, respectively, thus ensuring the airtight condition between thehousing 20 and theelectrodes 2 and 4. - The action of the thus structured lightening arresting insulator will now be described.
- A lightening surge current flows through a power-transmission line with the lightening arresting insulator attached to the cross arm of a transmission tower. The current starts to be discharged (flash-over) from arching horns (not shown) on the power-transmission line to arching horns or series gaps (also not shown) attached to the lower end of the lightening arresting insulator. The current runs through the electrode 4, the
conductive fixture 7, the current-limitingvaristors 8, theconductor 9, thefoil 13, theconductor 12, thering 10 to theelctrode 2. The lightening surge current finally runs to the transmission tower through the adaptor (not shown) to be discharged to the ground. A follow current which follows is limited and then interrupted by the series gaps and the current-limitingvaristors elements 8. - If an unexpectedly large amount of lightening surge current flows through the lightening arresting insulator, the current-limiting
elements 8 are rendered conductive, and then a current flows through the lightening arresting insulator in response to a drive voltage, thus generating a high-temperature and high-pressure gas arc inside the lightening arresting insulator. The gas arc is transmitted to thethin wall portions 18 through the insulatinglayer 16 in the sealed space between the insulating cylinder 1 and the current-limitingelements 8. The gas arc is then rapidly released outside through the thin-wall portions 18 and part of thehousing 20. The lightening arresting insulator will not therefore be damaged as a whole. - In the lightening arresting insulator according to the embodiment as described above, a plurality of
slits 17 are provided in the outer surface of the insulating cylinder 1 to form the pressure-releasingthin wall portions 18. With this structure, unlike conventional structures having pressure-release holes formed in the outer surface of the insulating cylinder, thethin wall portions 18 can suppress water from passing therethrough so that the airtight condition inside the insulating cylinder 1 can be kept. - The lightening arresting insulator according to this embodiment has a rubbery
elastic insulator 19 in theslits 17 on the outer wall of the insulating cylinder 1. Because of theelastic insulator 19, thethin wall portions 18 are not exposed directly through the outer wall of the insulating cylinder 1. The lightening arresting insulator in this embodiment differs from the conventional from arresting insulators which do not have an insulating cylinder but rather have thin wall portions formed on the outer surface of the insulating tube of a polymer material. More specifically, thethin wall portions 18 of the lightening arresting insulator according to this embodiment will not be hit by tools or the like in the manufacturing process so are unlikely to be damaged or broken by such an accident. Further, it is possible to prevent the lightening arresting insulator from being damaged by birds pecking. In the lightening arresting insulator according to this embodiment, theslits 17 can be easily formed in the outer wall of the insulating cylinder 1 through post fabrication working. - The present invention is not limited to the structure of the above-described embodiment, but can be modified and worked as follows within the scope of the present invention.
- (1) As shown in Fig. 5, the
slits 17 may be formed as single lines in the axial direction. With this structure alone, there is a danger that when the pressure-releasingthin wall sections 18 are torn and the inner pressure is released, theslits 17 may be opened wide to become a single wide opening. In this condition, the current-limitingvaristors 8 or the like might separate from the insulating cylinder 1 through the wide opening. To prevent such an accident, anauxiliary ring 22, which is formed of glass fibers impregnated with an epoxy resin or a phenol resin, is provided on the outer wall of the insulating cylinder 1. The amount of expanding the diameter of the insulating cylinder 1 can be limited in this manner. - (2) Before the
housing 20 is coated on the outer wall of the insulating cylinder 1, theelastic insulator 19 is formed integrally with theslits 17 on the outer wall of the insulating cylinder 1. This can eliminate the need for filling an insulator in each slit. - (3) Gas with a high insulating property, such as sulfur hexafluoride (SF6), is sealed into the airtight space between the insulating cylinder 1 and the current-limiting
elements 8. Since sulfur hexafluoride (SF6) is highly heat resistant and non-corrosive, it is thermally and chemically stable and will not react on the current-limiting elements in the lightening arresting insulator. - (4) The
housing 20 is formed of ethylene propylene rubber (EPDM). Thishousing 20 has excellent water resistance, oxidation resistance, and ozone resistance, as well as good electric characteristics as an insulator. - Therefore, the present examples and embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein.
Claims (10)
- A lightening arresting insulator with a pressure-release mechanism for releasing pressure when a lightening surge flows in a power transmission line, comprising:
an insulating cylinder of high voltage resistance;
a plurality of longitudinally extending slits formed in an outer surface of the insulating cylinder to form thin wall portions in the insulating cylinder; and
an elastic insulator filled in each of the plurality of slits. - A lightening arresting insulator according to claim 1, further comprising an auxiliary ring formed from synthetic resin-impregnated glass fibers, the auxiliary ring being journaled about an outer wall of the insulating cylinder.
- A lightening arresting insulator for use in connection with a suspension insulator that carries a power transmission line to create a series gap between the suspension insulator and the arresting insulator, for rapidly discharging a lightening surge which runs through the power transmission line to the ground, and for interrupting a subsequent ground fault, the arresting insulator comprising:
an insulating cylinder having a plurality of longitudinally extending slits formed in an outer wall thereof to form thin wall portions in the insulating cylinder, the insulating cylinder being formed of a durable and reinforced resin;
an elastic insulator filled in each of the slits;
a pair of electrodes, each electrode being securely coupled to an associated end of the insulating cylinder;
a plurality of stacked current-limiting elements having nonlinear voltage-current characteristics, the current-limiting elements being retained in the insulating cylinder; and
a housing formed on an outer surface of the insulating cylinder, the housing including a plurality of sheds. - A lightening arresting insulator according to claim 3, wherein the housing and the elastic insulator that fills the slits are integrally formed.
- A lightening arresting insulator according to claim 3, wherein an insulating gas is sealed in an airtight space between the insulating cylinder and the current-limiting elements.
- A lightening arresting insulator according to claim 5, wherein the insulating gas is sulfur hexafluoride.
- A lightening arresting insulator according to claim 3, wherein upper and lower end portions of the housing extend to outer surfaces of the electrodes on the ground side and applied voltage side.
- A lightening arresting insulator according to claim 3, wherein the housing is made of a high temperature thermosetting rubber.
- A lightening arresting insulator according to claim 3, wherein the housing is made of ethylene propylene rubber (EPDM).
- A lightening arresting insulator for use in connection with a suspension insulator that carries a power transmission line to create a series gap between the suspension insulator and the arresting insulator, for rapidly discharging a lightening surge which runs through the power transmission line to the ground, and for interrupting a subsequent ground fault, the arresting insulator comprising:
an insulating cylinder having a plurality of longitudinally extending slits formed in an outer wall thereof to form thin wall portions in the insulating cylinder, the insulating cylinder being formed of a durable and reinforced resin;
an elastic insulator filled in each of the slits;
a pair of electrodes, each electrode being securely coupled to an associated end of the insulating cylinder, the electrode on a ground side including an integrally formed flange and the electrode on the applied voltage side including an integrally formed bracket;
a plurality of stacked current-limiting elements having nonlinear voltage-current characteristics, the current-limiting elements being retained in the insulating cylinder; and
a cylindrical conductor, disposed between a ground side end of the current-limiting element stack and serving as a spring receiver;
a coil spring disposed between the cylindrical conductor and said ground side electrode; and
a housing for encasing the insulating cylinder, the housing being formed of a room-temperature thermosetting silicone rubber and having a plurality of sheds formed on an outer surface of the housing.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP41734790A JPH07118237B2 (en) | 1990-12-28 | 1990-12-28 | Lightning arrester |
JP417347/90 | 1990-12-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0493134A1 true EP0493134A1 (en) | 1992-07-01 |
EP0493134B1 EP0493134B1 (en) | 1996-03-27 |
Family
ID=18525467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910312070 Expired - Lifetime EP0493134B1 (en) | 1990-12-28 | 1991-12-28 | Lightning arresting insulator |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0493134B1 (en) |
JP (1) | JPH07118237B2 (en) |
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CN107301907A (en) * | 2017-07-19 | 2017-10-27 | 国网湖南省电力公司 | A kind of anti-icing anti-thunder insulator |
CN111627622A (en) * | 2020-06-05 | 2020-09-04 | 江西百新电瓷电气有限公司 | 10KV automatic-adjustment lightning-protection ice porcelain insulator with pressure-sensitive device and manufacturing method thereof |
CN113611570A (en) * | 2021-07-28 | 2021-11-05 | 台州熠嘉电气科技有限公司 | High-voltage switch equipment driven by permanent magnet mechanism |
CN114035002A (en) * | 2021-11-11 | 2022-02-11 | 国网河南省电力公司商丘供电公司 | High tension transmission line insulator safety inspection device |
CN115085127A (en) * | 2022-07-29 | 2022-09-20 | 福建永福电力设计股份有限公司 | Novel binding material for line post insulator and insulated wire |
WO2023242115A1 (en) * | 2022-06-13 | 2023-12-21 | Hitachi Energy Ltd | Enhanced composite wrapped surge arrester and methods of providing the same |
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---|---|---|---|---|
CN104298833B (en) * | 2014-10-30 | 2016-04-13 | 国网电力科学研究院武汉南瑞有限责任公司 | Combined type composite material shaft tower lightning stroke simulation model generation method |
DE102017214287A1 (en) * | 2017-08-16 | 2019-02-21 | Siemens Aktiengesellschaft | Surge arresters and method of manufacturing a surge arrester |
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US4424547A (en) * | 1980-11-04 | 1984-01-03 | General Electric Company | Surge suppressor construction |
EP0393854A1 (en) * | 1989-04-18 | 1990-10-24 | Cooper Industries, Inc. | Fail-safe surge arrester |
EP0397163A1 (en) * | 1989-05-12 | 1990-11-14 | Sediver, Societe Europeenne D'isolateurs En Verre Et Composite | Wound hermetic filamentary envelope and surge arrester assembly using same |
-
1990
- 1990-12-28 JP JP41734790A patent/JPH07118237B2/en not_active Expired - Lifetime
-
1991
- 1991-12-28 EP EP19910312070 patent/EP0493134B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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Also Published As
Publication number | Publication date |
---|---|
JPH04249816A (en) | 1992-09-04 |
JPH07118237B2 (en) | 1995-12-18 |
EP0493134B1 (en) | 1996-03-27 |
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