CA1332075C - Lightning protection apparatus - Google Patents
Lightning protection apparatusInfo
- Publication number
- CA1332075C CA1332075C CA 558856 CA558856A CA1332075C CA 1332075 C CA1332075 C CA 1332075C CA 558856 CA558856 CA 558856 CA 558856 A CA558856 A CA 558856A CA 1332075 C CA1332075 C CA 1332075C
- Authority
- CA
- Canada
- Prior art keywords
- insulating
- lightning protection
- insulating tube
- protection apparatus
- plate
- 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.)
- Expired - Fee Related
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In this lightning protection apparatus of the inven-tion, an insulating plate being mounted on an earthing side end portion of an insulating tube is formed of an insulating member which is integrally formed by metal member and serves as both an earth terminal and a bursting plate, so that above arrangement simplifies the construction of the earth side end portion of the insulating tube, facilitates assem-bly operation, and permits cost saving.
In this lightning protection apparatus of the inven-tion, an insulating plate being mounted on an earthing side end portion of an insulating tube is formed of an insulating member which is integrally formed by metal member and serves as both an earth terminal and a bursting plate, so that above arrangement simplifies the construction of the earth side end portion of the insulating tube, facilitates assem-bly operation, and permits cost saving.
Description
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to lightning protec-tion apparatus and, more particularly, to a lightning protection apparatus of the type having an insulation tube in which a non-linear resistance element is housed.
Description of the Prior Art Lightning protection apparatus intended mainly for installation at substations and the like facilities are so designed that when an overvoltage is applied by a lightning stroke, a current is discharged to the ground to reduce the overvoltage~ In such lightning protection apparatus, today, a non-linear resistance element composed principally of zinc oxide (ZnO), a kind of new ceramics, is commonly used as is described in Japanese Laid-Open Application No.
59-7584 (1984).
In that apparatus, an insulating tube houses a zinc oxide element, i.e., a non-linear resistance element, supported on a support base. A coil spring ,~ I is provided for fixing the zinc oxide element. The insulating tube is sealed at its upper and lower ends by an upper plate and a lower plate. An internal current flows in the zinc oxide element, and an external current flows along the surface of the ~q ~ 1 332075 insulating tube and are separated from each other by an insulating ring.
A metal flange for mounting the lower plate and the insulating ring is bonded to the lower end of the insulating tube, and bolts for fixing the lower plate and the insulating ring are clamped to the metal flange through insulating washers. Between the underside of the insulating tube and the lower plate there is interposed an O-ring or a packing for keeping the interior of the tube airtight. An internal space of the insulating tube communicates through a vent hole of the support base with the upperside of a membrane-like bursting plate formed in the lower plate. The lower plate is formed with a laterally extending earth terminal.
In the lightning protection apparatus of such arrangement as above described, the earthing lower side portion thereof is required to have the following three functions:
(1) keeping the interior of the insulating tube airtight;
Field of the Invention This invention relates to lightning protec-tion apparatus and, more particularly, to a lightning protection apparatus of the type having an insulation tube in which a non-linear resistance element is housed.
Description of the Prior Art Lightning protection apparatus intended mainly for installation at substations and the like facilities are so designed that when an overvoltage is applied by a lightning stroke, a current is discharged to the ground to reduce the overvoltage~ In such lightning protection apparatus, today, a non-linear resistance element composed principally of zinc oxide (ZnO), a kind of new ceramics, is commonly used as is described in Japanese Laid-Open Application No.
59-7584 (1984).
In that apparatus, an insulating tube houses a zinc oxide element, i.e., a non-linear resistance element, supported on a support base. A coil spring ,~ I is provided for fixing the zinc oxide element. The insulating tube is sealed at its upper and lower ends by an upper plate and a lower plate. An internal current flows in the zinc oxide element, and an external current flows along the surface of the ~q ~ 1 332075 insulating tube and are separated from each other by an insulating ring.
A metal flange for mounting the lower plate and the insulating ring is bonded to the lower end of the insulating tube, and bolts for fixing the lower plate and the insulating ring are clamped to the metal flange through insulating washers. Between the underside of the insulating tube and the lower plate there is interposed an O-ring or a packing for keeping the interior of the tube airtight. An internal space of the insulating tube communicates through a vent hole of the support base with the upperside of a membrane-like bursting plate formed in the lower plate. The lower plate is formed with a laterally extending earth terminal.
In the lightning protection apparatus of such arrangement as above described, the earthing lower side portion thereof is required to have the following three functions:
(1) keeping the interior of the insulating tube airtight;
(2) discharging internal gas through the b!urst~
ing plate during possible internal pressure rise in case of internal shorting; and .' (3) separating the current flowing in the zinc oxide element from the current flowing along the outer surface of the insulating tube.
In the arrangement described above, func-tions (1) and (2) are assured by the lower plate, and function (3) is assured by the insulating ring and the insulating washer.
Another form of lightning protection arrangement is disclosed in Japanese Utility Model Laid-Open No. 59-393 (1984), in which an insulating terminal board having an earth terminal embedded therein is bonded to the underside of the metal flange, with a bursting plate being uniformly pressed by a metal ring and clamped by bolts to the underside of the insulating terminal board. In an insulator of the insulating terminal board, there is formed a vent hole which connects through an internal space of the insulating tube to the upper side of the bursting plate.
Wi'ch this arrangement, item (3) of the foregoing three requirements is met by the bursting plate, and items (1) and (2! by the insulating ter-minal board.
In the prior art lightning protection apparatus, the earthing side end portion thereof is constructed as above described and accordingly the "~ ~ "''','''' '''.,'',~,, ` 1 332075 ~-required three functions are performed by a combina-tion of two or more parts. This naturally involves a relatively large number of parts, which is disadvan-tageous from the standpoints of assembly operation and cost.
SUMMARY OF THE INVENTION
This invention is made in view of the above-mentioned drawback of the prior art arrangement, and it is intended to provide a lightning protection apparatus which involves a smaller number of parts and simplified assembly work because of a single part designed to perform the three functions required of the apparatus, and which is less expensive.
The lightning protection apparatus in accordance with the invention comprises an integrally formed metal member having functions of both an earth terminal and a bursting plate, the metal member being molded integrally with an insulating material and mounted as such to the earthing end of an insulating tube.
The above and further objects and features of the invention will more fully be apparent from the following detailed description with accompanying drawings.
t~
' ' ' . ' ~
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a longitudinal sectional view showing, by way of example, a general arranyement of a prior art lightning protection apparatus;
Fig. 2 is a longitudinal sectional view showing a detailed arrangement of an earth terminal side end portion thereof;
Fig. 3 is a longitudinal sectional view showing another prior art arrangement;
Fig. 4 is a longitudinal sectional view showing, by way of example, a general arrangement of a ; lightning protection apparatus embodying the inven-tion;
Fig. 5 is a longitudinal sectional view showing in detail one form of earth terminal side end portion thereof; and Fig. 6 is a longitudinal sectional view of another embodiment of the same portion.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figs. 1 and 2 illustrate, by way of example, a lightning protection apparatus using such conven-tional,non-linear resistance element, which is dis-closed in Japanese Patent Laid-Open No. 59-7584 (1984).
In Fig. 1, it is seen that in an insulating tube 1 there is housed a zinc oxide element 2, i.e., a ,'''',~, ~; _ 5 _ ~
,4 ~
. .
non-linear resistance element, supported on a support base 3. Shown at 4 is a coil spring for fixing the zinc oxide element 2. The insulating tube 1 is sealed at its upper and lower ends by an upper plate 5 and a lower plate 6. An internal current flowing in the zinc oxide element 2 shown with arrow a, and an external current flowing along the surface of the insulating tube 1 shown with arrow b, are separated from each other by an insulating ring 7.
Fig. 2 is a detail view of a lower portion of the Fig. 1 arrangement. In Fig. 2, a metal flange 101 for mounting the lower plate 6 and the insulating ring 7 is bonded to the lower end of the insulating tube 1, and bolts 8 for fixing the lower plate 6 and the insulating ring 7 are clamped to the metal flange 101 through insulating washers 9. Between the under-side of the insulating tube 1 and the lower plate 6 there is interposed an O-ring 10 or a packing for keeping the interior of the tube 1 airtight. An internal space of the insulating tube 1 communicates through a vent hole 301 of the support base 3 with the upperside of a membrane-like bursting plate 601 formed in the lower plate 6. The lower plate 6 is formed with a laterally extending earth terminal 602. Arrow c shows the flow of an internal gas in case of inter-nal pressure rising.
' ~
- 5a -I .
In the lightning protection apparatus of such arrangement as above described, the earthing lower side portion thereof is required to have the following three functions:
(1) keeping the interior of th~ insulating tube airtight;
(2) discharging internal gas through the burst-ing plate during possible internal pressure rise in case of internal shorting; and (3) separating the current flowing in the zinc oxide element from the current flowing along the outer surface of the insulating tube.
In the arrangement shown in Fig. 2, func-tions (1) and (2) are assured by the lower plate 6, and the function (3) is assured by the insulating ring 7 and the insulating washer 9.
Fig. 3 shows another form of lightning protection arrangement disclosed in Japanese Utility Model Laid-Open No. 59-393 (1984), in which an insula-ting terminal board 11 having an earth terminal 1101 embedded therein is bonded to the underside of the metal flange 101, a bursting plate 12 being uniformly pressed by a metal ring 13 and clamped by bolts 8 to the underside of the insulating terminal board 11. In an insulator 1102 of the insulating terminal board 11, there is formed a vent hole 1103 which connects '.' ''.
: ~....... - 5b -through an internal space of the insulating tube 1 to the upper side of the bursting plate 12.
With thls arrangement, item (3) of the foregoing three requirements is met by the bursting plate 12, and items (l) and (2) by the insulaiing terminal board ll.
The preferred embodiments of the invention is now described with the relevant ones of the accom-panying drawings.
Fig. 4 is a longitudinal sectional view showing, by way of example, general arrangement of a lightning protection apparatus embodying the inven-tion.
. ..
~: : ' ,,-,' ', .- ':
` :
;~
,~ " .. '~
~ .
:~ ''`s .' "---' 1 332075 In Fig. 4, a zinc oxide element 2, i.e., a non-linear resistance element, supported on a support base 3 is housed in an insulating tube 1. Numeral 4 designates a coil spring for fixing the zinc oxide element 2 in position.
The insulating tube 1 is sealed at its upper end with an upper plate 5, and at its lower end with an insulating plate 14 characterizing the invention. An internal current flowing through the zinc oxide element 2 shown with arrow a and an external current flowing along the surface of the insulating tube 1 shown with arrow b are separated by the insulating plate 14.
Fig. 5 is a longitudinal sertional view showing in detail a first embodiment of the earthing side end portion of the lightning protection apparatus ; according to the invention.
In addition, the insulating plate 14 is made of polyester, epoxy resin or phenol resin.
In this first embodiment shown in Fig. S, the insulating plate 14 is mounted on the earthing side end portion of the insulating tube 1, the insulating plate 14 constituting a characteristic feature of the invention. The insulating plate 14 is so molded as to ., .,.-` enclose a metal member which is formed of a bursting plate 1403 and an earth terminal 1401 integrally.
; ;, ~; The arrangement of the earthing side end ~-~
portion of the '';~
~'~,":',.' insulating tube 1 is now described in detail.
A metal flange 101 ls bonded to the outer periphery of the earthlng side end portion o~ the insulating tube 1, and the insulating plate 14 is clamped by bolts 8 to the metal flange 101 through insulating washers 9.
Between the end surface of the insulating tube 1 and the insu~ating plate 1.4 there interposed an 0-ring 10 or a packing, whereby the interior of the insulating tube 1 is kept airtight.
A median portion of the insulating plate 14 is shaped ~.
in a membrane-like pattern, and between the membrane-like portion and the support base 3 there is defined a space 30.
This space 30 communicates with the interior of the insulat-ing tube 1 through a vent hole 301 extending through the support base 3. Therefore, when there is an internal pres-sure rising in the insulating tube 1, a gas stream flows from the interior of the insulating tube 1 toward the burst-ing plate 1403 through the vent hole 301, whereby the burst-ing plate 1403 will burst to release the pressure.
An earth terminal 1404 is formed, extending laterally from the insulatin~ plate 14.
Since the lightning protection apparatus of the present ;~
invention i8 constructed as above described, performance of aforesaid three functions, namely, (1) keeping the interior of the insulatin~ tube airtight, t2) gas discharge in case 1 332075 ~:
of a gas pressure rising in the interior of the insulating tube, and (3) separation of the current flowing in the zinc oxide element from the current flowing along the outer sur-face of the insulating tube, is assured by a single part, ~;
that is, the insulating plate 14. ;
In the embodiment shown in Fig. 5, the 0-ring is inter-posed between the insulating tube 1 and the insulating mem-ber which constitutes both the earth terminal 1401 and the bursting plate 1403, but alternatively, as shown in Fig. 6 -as a second embodiment, the 0-ring may be interposed between the insulating plate 14 and the insulating tube 1. ;
As described above, according to the invention, per- ~
formance of the three functions required for the earthing ~-side end portion of the insulating tube, that is, keeping the interior of the insulating tube airtiht, gas release in ~ "
case of an internal pressure rising in the insulating tube, and drawing currents separately through insulation between the inter~or and the exterior of the insulating tube, is as-sured by only one part.
As the inventlon may be embodied in several forms with-olut departing from the spirit of essential characteristics thereof, the present embodiment is therefore illustrative ~-and not restrictive, since the scope of the invention is defined by the appended claims rather than by the descrip-tion preceding them, and all changes that fall within the ,''", , meets and bounds of the claims, or equivalence of such meets and bounds thereof are therefore intended to be embraced by the claims.
.';
:
ing plate during possible internal pressure rise in case of internal shorting; and .' (3) separating the current flowing in the zinc oxide element from the current flowing along the outer surface of the insulating tube.
In the arrangement described above, func-tions (1) and (2) are assured by the lower plate, and function (3) is assured by the insulating ring and the insulating washer.
Another form of lightning protection arrangement is disclosed in Japanese Utility Model Laid-Open No. 59-393 (1984), in which an insulating terminal board having an earth terminal embedded therein is bonded to the underside of the metal flange, with a bursting plate being uniformly pressed by a metal ring and clamped by bolts to the underside of the insulating terminal board. In an insulator of the insulating terminal board, there is formed a vent hole which connects through an internal space of the insulating tube to the upper side of the bursting plate.
Wi'ch this arrangement, item (3) of the foregoing three requirements is met by the bursting plate, and items (1) and (2! by the insulating ter-minal board.
In the prior art lightning protection apparatus, the earthing side end portion thereof is constructed as above described and accordingly the "~ ~ "''','''' '''.,'',~,, ` 1 332075 ~-required three functions are performed by a combina-tion of two or more parts. This naturally involves a relatively large number of parts, which is disadvan-tageous from the standpoints of assembly operation and cost.
SUMMARY OF THE INVENTION
This invention is made in view of the above-mentioned drawback of the prior art arrangement, and it is intended to provide a lightning protection apparatus which involves a smaller number of parts and simplified assembly work because of a single part designed to perform the three functions required of the apparatus, and which is less expensive.
The lightning protection apparatus in accordance with the invention comprises an integrally formed metal member having functions of both an earth terminal and a bursting plate, the metal member being molded integrally with an insulating material and mounted as such to the earthing end of an insulating tube.
The above and further objects and features of the invention will more fully be apparent from the following detailed description with accompanying drawings.
t~
' ' ' . ' ~
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a longitudinal sectional view showing, by way of example, a general arranyement of a prior art lightning protection apparatus;
Fig. 2 is a longitudinal sectional view showing a detailed arrangement of an earth terminal side end portion thereof;
Fig. 3 is a longitudinal sectional view showing another prior art arrangement;
Fig. 4 is a longitudinal sectional view showing, by way of example, a general arrangement of a ; lightning protection apparatus embodying the inven-tion;
Fig. 5 is a longitudinal sectional view showing in detail one form of earth terminal side end portion thereof; and Fig. 6 is a longitudinal sectional view of another embodiment of the same portion.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figs. 1 and 2 illustrate, by way of example, a lightning protection apparatus using such conven-tional,non-linear resistance element, which is dis-closed in Japanese Patent Laid-Open No. 59-7584 (1984).
In Fig. 1, it is seen that in an insulating tube 1 there is housed a zinc oxide element 2, i.e., a ,'''',~, ~; _ 5 _ ~
,4 ~
. .
non-linear resistance element, supported on a support base 3. Shown at 4 is a coil spring for fixing the zinc oxide element 2. The insulating tube 1 is sealed at its upper and lower ends by an upper plate 5 and a lower plate 6. An internal current flowing in the zinc oxide element 2 shown with arrow a, and an external current flowing along the surface of the insulating tube 1 shown with arrow b, are separated from each other by an insulating ring 7.
Fig. 2 is a detail view of a lower portion of the Fig. 1 arrangement. In Fig. 2, a metal flange 101 for mounting the lower plate 6 and the insulating ring 7 is bonded to the lower end of the insulating tube 1, and bolts 8 for fixing the lower plate 6 and the insulating ring 7 are clamped to the metal flange 101 through insulating washers 9. Between the under-side of the insulating tube 1 and the lower plate 6 there is interposed an O-ring 10 or a packing for keeping the interior of the tube 1 airtight. An internal space of the insulating tube 1 communicates through a vent hole 301 of the support base 3 with the upperside of a membrane-like bursting plate 601 formed in the lower plate 6. The lower plate 6 is formed with a laterally extending earth terminal 602. Arrow c shows the flow of an internal gas in case of inter-nal pressure rising.
' ~
- 5a -I .
In the lightning protection apparatus of such arrangement as above described, the earthing lower side portion thereof is required to have the following three functions:
(1) keeping the interior of th~ insulating tube airtight;
(2) discharging internal gas through the burst-ing plate during possible internal pressure rise in case of internal shorting; and (3) separating the current flowing in the zinc oxide element from the current flowing along the outer surface of the insulating tube.
In the arrangement shown in Fig. 2, func-tions (1) and (2) are assured by the lower plate 6, and the function (3) is assured by the insulating ring 7 and the insulating washer 9.
Fig. 3 shows another form of lightning protection arrangement disclosed in Japanese Utility Model Laid-Open No. 59-393 (1984), in which an insula-ting terminal board 11 having an earth terminal 1101 embedded therein is bonded to the underside of the metal flange 101, a bursting plate 12 being uniformly pressed by a metal ring 13 and clamped by bolts 8 to the underside of the insulating terminal board 11. In an insulator 1102 of the insulating terminal board 11, there is formed a vent hole 1103 which connects '.' ''.
: ~....... - 5b -through an internal space of the insulating tube 1 to the upper side of the bursting plate 12.
With thls arrangement, item (3) of the foregoing three requirements is met by the bursting plate 12, and items (l) and (2) by the insulaiing terminal board ll.
The preferred embodiments of the invention is now described with the relevant ones of the accom-panying drawings.
Fig. 4 is a longitudinal sectional view showing, by way of example, general arrangement of a lightning protection apparatus embodying the inven-tion.
. ..
~: : ' ,,-,' ', .- ':
` :
;~
,~ " .. '~
~ .
:~ ''`s .' "---' 1 332075 In Fig. 4, a zinc oxide element 2, i.e., a non-linear resistance element, supported on a support base 3 is housed in an insulating tube 1. Numeral 4 designates a coil spring for fixing the zinc oxide element 2 in position.
The insulating tube 1 is sealed at its upper end with an upper plate 5, and at its lower end with an insulating plate 14 characterizing the invention. An internal current flowing through the zinc oxide element 2 shown with arrow a and an external current flowing along the surface of the insulating tube 1 shown with arrow b are separated by the insulating plate 14.
Fig. 5 is a longitudinal sertional view showing in detail a first embodiment of the earthing side end portion of the lightning protection apparatus ; according to the invention.
In addition, the insulating plate 14 is made of polyester, epoxy resin or phenol resin.
In this first embodiment shown in Fig. S, the insulating plate 14 is mounted on the earthing side end portion of the insulating tube 1, the insulating plate 14 constituting a characteristic feature of the invention. The insulating plate 14 is so molded as to ., .,.-` enclose a metal member which is formed of a bursting plate 1403 and an earth terminal 1401 integrally.
; ;, ~; The arrangement of the earthing side end ~-~
portion of the '';~
~'~,":',.' insulating tube 1 is now described in detail.
A metal flange 101 ls bonded to the outer periphery of the earthlng side end portion o~ the insulating tube 1, and the insulating plate 14 is clamped by bolts 8 to the metal flange 101 through insulating washers 9.
Between the end surface of the insulating tube 1 and the insu~ating plate 1.4 there interposed an 0-ring 10 or a packing, whereby the interior of the insulating tube 1 is kept airtight.
A median portion of the insulating plate 14 is shaped ~.
in a membrane-like pattern, and between the membrane-like portion and the support base 3 there is defined a space 30.
This space 30 communicates with the interior of the insulat-ing tube 1 through a vent hole 301 extending through the support base 3. Therefore, when there is an internal pres-sure rising in the insulating tube 1, a gas stream flows from the interior of the insulating tube 1 toward the burst-ing plate 1403 through the vent hole 301, whereby the burst-ing plate 1403 will burst to release the pressure.
An earth terminal 1404 is formed, extending laterally from the insulatin~ plate 14.
Since the lightning protection apparatus of the present ;~
invention i8 constructed as above described, performance of aforesaid three functions, namely, (1) keeping the interior of the insulatin~ tube airtight, t2) gas discharge in case 1 332075 ~:
of a gas pressure rising in the interior of the insulating tube, and (3) separation of the current flowing in the zinc oxide element from the current flowing along the outer sur-face of the insulating tube, is assured by a single part, ~;
that is, the insulating plate 14. ;
In the embodiment shown in Fig. 5, the 0-ring is inter-posed between the insulating tube 1 and the insulating mem-ber which constitutes both the earth terminal 1401 and the bursting plate 1403, but alternatively, as shown in Fig. 6 -as a second embodiment, the 0-ring may be interposed between the insulating plate 14 and the insulating tube 1. ;
As described above, according to the invention, per- ~
formance of the three functions required for the earthing ~-side end portion of the insulating tube, that is, keeping the interior of the insulating tube airtiht, gas release in ~ "
case of an internal pressure rising in the insulating tube, and drawing currents separately through insulation between the inter~or and the exterior of the insulating tube, is as-sured by only one part.
As the inventlon may be embodied in several forms with-olut departing from the spirit of essential characteristics thereof, the present embodiment is therefore illustrative ~-and not restrictive, since the scope of the invention is defined by the appended claims rather than by the descrip-tion preceding them, and all changes that fall within the ,''", , meets and bounds of the claims, or equivalence of such meets and bounds thereof are therefore intended to be embraced by the claims.
.';
:
Claims (5)
1. A lightning protection apparatus comprising:
an insulating tube housing a non-linear resistance element therein; a fixing metal member being fixed to the outer periphery of said insulating tube; an earth terminal being electrically connected to said non-linear resistance element and fixed to said fixing metal member through an insulating member; and a burst-ing plate being mounted on the earthing side end portion of said insulating tube and being adapted to burst to release the pressure when an internal pressure of said insulating tube increases, characterized in that;
said earth terminal, said bursting plate and said insulating member are formed in such a way that said insulating member is molded around a metal member which is formed of said earth terminal and said burst-ing plate integrally.
an insulating tube housing a non-linear resistance element therein; a fixing metal member being fixed to the outer periphery of said insulating tube; an earth terminal being electrically connected to said non-linear resistance element and fixed to said fixing metal member through an insulating member; and a burst-ing plate being mounted on the earthing side end portion of said insulating tube and being adapted to burst to release the pressure when an internal pressure of said insulating tube increases, characterized in that;
said earth terminal, said bursting plate and said insulating member are formed in such a way that said insulating member is molded around a metal member which is formed of said earth terminal and said burst-ing plate integrally.
2. A lightning protection apparatus as set forth in claim 1, wherein said earth terminal is pro-jected outside said insulating member.
3. A lightning protection apparatus as set forth in claim 1, wherein said insulating member is made of polyester.
4. A lightning protection apparatus as set forth in claim 1, wherein said insulating member is made of epoxy resin.
5. A lightning protection apparatus as set forth in claim 1, wherein said insulating member is made of phenol resin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62-40185 | 1987-02-25 | ||
| JP4018587A JPS63208202A (en) | 1987-02-25 | 1987-02-25 | Arrestor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1332075C true CA1332075C (en) | 1994-09-20 |
Family
ID=12573722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 558856 Expired - Fee Related CA1332075C (en) | 1987-02-25 | 1988-02-12 | Lightning protection apparatus |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0280116B1 (en) |
| JP (1) | JPS63208202A (en) |
| CA (1) | CA1332075C (en) |
| DE (1) | DE3883802T2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03149802A (en) * | 1989-11-07 | 1991-06-26 | Ngk Insulators Ltd | Arrester |
| DE102007027411A1 (en) * | 2007-06-11 | 2008-12-18 | Siemens Ag | arrester |
| CN112368789B (en) * | 2018-06-15 | 2022-07-29 | 西门子能源全球有限公司 | Surge arrester with pressure relief device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4298900A (en) * | 1980-01-02 | 1981-11-03 | Avdeenko Boris K | Overvoltage protective device |
| US4463405A (en) * | 1981-02-19 | 1984-07-31 | Electric Power Research Institute, Inc. | Fail safe surge arrester |
| EP0217021B1 (en) * | 1985-09-02 | 1990-04-18 | BBC Brown Boveri AG | Overvoltage diverter and method of manufacturing it |
-
1987
- 1987-02-25 JP JP4018587A patent/JPS63208202A/en active Pending
-
1988
- 1988-02-11 DE DE19883883802 patent/DE3883802T2/en not_active Expired - Fee Related
- 1988-02-11 EP EP19880101970 patent/EP0280116B1/en not_active Expired - Lifetime
- 1988-02-12 CA CA 558856 patent/CA1332075C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE3883802D1 (en) | 1993-10-14 |
| DE3883802T2 (en) | 1994-01-13 |
| EP0280116B1 (en) | 1993-09-08 |
| JPS63208202A (en) | 1988-08-29 |
| EP0280116A2 (en) | 1988-08-31 |
| EP0280116A3 (en) | 1989-04-05 |
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