CA1088146A - Surge arrester - Google Patents
Surge arresterInfo
- Publication number
- CA1088146A CA1088146A CA276,880A CA276880A CA1088146A CA 1088146 A CA1088146 A CA 1088146A CA 276880 A CA276880 A CA 276880A CA 1088146 A CA1088146 A CA 1088146A
- Authority
- CA
- Canada
- Prior art keywords
- electrodes
- surge arrester
- contact member
- pressed
- recess
- 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
Links
Classifications
-
- 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
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
- H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed
-
- 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
-
- 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
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/16—Overvoltage arresters using spark gaps having a plurality of gaps arranged in series
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
Abstract of the Disclosure In a surge arrester provided with cup-shaped electrodes, being fitted in gas-tight fashion into the ends of a tubular insulating body and with a cylindrical contact member, the outer surfaces of the electrodes hav-ing a stepped cylindrical recess, into at least one of which a cylindrical contact member is adapted to be pressed.
Description
This invention relates to a surge arrester.
A surge arrester of the known type is shown in German Patent 1~922,823. The electrodes of that surge arrester have the configuration of a truncated cone and are placed in gas-tight fashion into the ends of a tubular insulating body in such a manner that the outsides of the top surface of the electrodes in truncated shape are face to face. Solid metal contact members, forming the feed lines of the surge arrester, are hard soldered to the elec-trodes at the inside of the top surface of their truncated shape. This type of affixing of the contact members is disadvantageous in that a hard soldering capable of carrying a load must be completed before the arrester is produced.
Moreover~ this operation is relatively costly. Another disadvantage is that the soldering of the contact members to the base of the truncated electrodes results in an irreg~ar heating up of the electrodes. This may result in un-desirable polarity effects in the ignition behavior of the surge arrester.
There are various reasons why it is advantageous to provide the arrester with at least one contact member. One advantage is that by means of contact members the outer dimension of the arrester can be varied so that mountings of different dimensions may be used thereon. It is particularly advantageous to first construct a symmetrical surge arrester and to then adapt it to its use, as the basic shape is usable in a suitable manner for a number of projects. Due to manufacturing costs, it is important that the parts be simple to produce and therefore can be manufactured in the largest possible numbers. Metal contact members offer a further advantage in that they in-crease the heat-absorption capacity of the electrodes and thus the load capa-city of the surge arrester. In general, it lS advantageous to keep the pas-sage (of current) away from the points of connection of the electrodes and insulating bodies. Furthermore, there are cases of application for surge arresters~ where it is advantageous to have ~he electrode GUp closed off by a contact member. This situation arises~ for example~ when in order to produce , " ,.,...,~
.
an outer shor~ circuit in the case of overvoltage on the surge arrester~ a soft solder plate is disposed between the surge arrester and thc outer con~
tact~ In an open electrode cup, a soft solder plate~ adapted to be pressed against the arrester by the continuous force of a spring, could be deformed sufficiently so thatg even without overvoltage of the arrester, an outer short circuit occursO
The present invention provides a surge arrester having a gas-tight housing comprising: a tubular insulating body; a pair of cup-shaped elec-trodes, one of the said electrodes being inserted into one end of the said body, the other said electrode being inserted into the other end o~ said ~-body~ each said electrode being proYided with a cylindrical contact member, the outer surface of each of the said electrodes being provided with a stepped reGess into which at least one of the said contact members is pressed.
A material which is electrically and mechanically particularly -suitable for the electrodes is brass. However, brass cannot be used for hard soldering because of its release of zinc. It is easy to maintain the required narrow tolerance in overall leng~h when the surge arrester is used in a mount-ing with an outer short circuit mechanism, even in cases where the length of the arrester is subject to greater variation. The surface treatment of the electrodes of the arres~er (nickel-plating, for example) can be carried out without a problem before the contact pieces are pressed in. In the known surge arresters, narrow gaps between electrode and contact member prevent the galvanic application of a continuous layer and interfere with the washing out of pickling residu0s Moreo~er~ the pressing of contact members into the electrodes represents a highly economical solution.
The drawing illustrates one embodiment of the present invention~ -The Figure shows a surge arrester having a gas-tight housing, pre-ferably filled with an inert gas~ wherein cup~shaped electrodes 1 and 29 placed opposite each other, are inserted into the ends of a tubular insulating :,,, , , : , ~ - , , ~l~F~ L46 body 6 and are connected therewith in gas-t:ight fashion7 body 6 being prefera-bly ceramic. The outer surfaces of the electrodes 1, 2 are each provided with a stepped cylindrical recess 3. A contact member 4 is pressed into the inward-ly tapering cylindrical portion of each recess 3. In the embodiment shown, the contact members 4 are solid cylinders. However, they may be hollow. One of the contact members 4 is provided with longitudinally extending slots 5 so that it is in the form of a slotted pin. A contact member of this configura-tion guarantees a particularly firm hold in the recess 3 by means of a pressure fit. The Figure further shows that the contact members 4 are spaced differ-ently from the bottom of the recess 3 so that a subsequent adaptation of thesurge arrester is made possible by means of these contact members 4~
Due to the fact that the electrodes 1~ 2 are provided with stepped cylindrical recesses 3, these electrodes also show a step forming an annular shoulder each having a double function. The inner diameter, bearing reference numeral 7, above the step in the electrodes 1, ~ guides them into the ceramic insulating body 6 thereby creating the space required between the surfaces of the electrodes 1, 2 and the insulating body 6. The outer diameter denoted by reference numeral 8 below the step in the electrodes 1, 2 forms a pressure fit with the contact members ~ The tension of the pressure fit is separated from the connecting area of the electrodes, and the insulating body by means of the resilient parts of the electrodes.
The present invention is not restricted to the illustrated embodi-ment. For e~ample, the two main electrodes of a double line arrester may be constructed according to the present invention and be provided with at least one pressed-in contact member. In the event that the electrodesg and/or the contact members are made from relatively inelastic materials, it may be advis-able to apply to the recesses of the electrodes a dot of a relatively quickly setting adhesive so that a firm hold of the contact members in the electrodes is guaranteed upon pressing i~.
. .
,~ .
A surge arrester of the known type is shown in German Patent 1~922,823. The electrodes of that surge arrester have the configuration of a truncated cone and are placed in gas-tight fashion into the ends of a tubular insulating body in such a manner that the outsides of the top surface of the electrodes in truncated shape are face to face. Solid metal contact members, forming the feed lines of the surge arrester, are hard soldered to the elec-trodes at the inside of the top surface of their truncated shape. This type of affixing of the contact members is disadvantageous in that a hard soldering capable of carrying a load must be completed before the arrester is produced.
Moreover~ this operation is relatively costly. Another disadvantage is that the soldering of the contact members to the base of the truncated electrodes results in an irreg~ar heating up of the electrodes. This may result in un-desirable polarity effects in the ignition behavior of the surge arrester.
There are various reasons why it is advantageous to provide the arrester with at least one contact member. One advantage is that by means of contact members the outer dimension of the arrester can be varied so that mountings of different dimensions may be used thereon. It is particularly advantageous to first construct a symmetrical surge arrester and to then adapt it to its use, as the basic shape is usable in a suitable manner for a number of projects. Due to manufacturing costs, it is important that the parts be simple to produce and therefore can be manufactured in the largest possible numbers. Metal contact members offer a further advantage in that they in-crease the heat-absorption capacity of the electrodes and thus the load capa-city of the surge arrester. In general, it lS advantageous to keep the pas-sage (of current) away from the points of connection of the electrodes and insulating bodies. Furthermore, there are cases of application for surge arresters~ where it is advantageous to have ~he electrode GUp closed off by a contact member. This situation arises~ for example~ when in order to produce , " ,.,...,~
.
an outer shor~ circuit in the case of overvoltage on the surge arrester~ a soft solder plate is disposed between the surge arrester and thc outer con~
tact~ In an open electrode cup, a soft solder plate~ adapted to be pressed against the arrester by the continuous force of a spring, could be deformed sufficiently so thatg even without overvoltage of the arrester, an outer short circuit occursO
The present invention provides a surge arrester having a gas-tight housing comprising: a tubular insulating body; a pair of cup-shaped elec-trodes, one of the said electrodes being inserted into one end of the said body, the other said electrode being inserted into the other end o~ said ~-body~ each said electrode being proYided with a cylindrical contact member, the outer surface of each of the said electrodes being provided with a stepped reGess into which at least one of the said contact members is pressed.
A material which is electrically and mechanically particularly -suitable for the electrodes is brass. However, brass cannot be used for hard soldering because of its release of zinc. It is easy to maintain the required narrow tolerance in overall leng~h when the surge arrester is used in a mount-ing with an outer short circuit mechanism, even in cases where the length of the arrester is subject to greater variation. The surface treatment of the electrodes of the arres~er (nickel-plating, for example) can be carried out without a problem before the contact pieces are pressed in. In the known surge arresters, narrow gaps between electrode and contact member prevent the galvanic application of a continuous layer and interfere with the washing out of pickling residu0s Moreo~er~ the pressing of contact members into the electrodes represents a highly economical solution.
The drawing illustrates one embodiment of the present invention~ -The Figure shows a surge arrester having a gas-tight housing, pre-ferably filled with an inert gas~ wherein cup~shaped electrodes 1 and 29 placed opposite each other, are inserted into the ends of a tubular insulating :,,, , , : , ~ - , , ~l~F~ L46 body 6 and are connected therewith in gas-t:ight fashion7 body 6 being prefera-bly ceramic. The outer surfaces of the electrodes 1, 2 are each provided with a stepped cylindrical recess 3. A contact member 4 is pressed into the inward-ly tapering cylindrical portion of each recess 3. In the embodiment shown, the contact members 4 are solid cylinders. However, they may be hollow. One of the contact members 4 is provided with longitudinally extending slots 5 so that it is in the form of a slotted pin. A contact member of this configura-tion guarantees a particularly firm hold in the recess 3 by means of a pressure fit. The Figure further shows that the contact members 4 are spaced differ-ently from the bottom of the recess 3 so that a subsequent adaptation of thesurge arrester is made possible by means of these contact members 4~
Due to the fact that the electrodes 1~ 2 are provided with stepped cylindrical recesses 3, these electrodes also show a step forming an annular shoulder each having a double function. The inner diameter, bearing reference numeral 7, above the step in the electrodes 1, ~ guides them into the ceramic insulating body 6 thereby creating the space required between the surfaces of the electrodes 1, 2 and the insulating body 6. The outer diameter denoted by reference numeral 8 below the step in the electrodes 1, 2 forms a pressure fit with the contact members ~ The tension of the pressure fit is separated from the connecting area of the electrodes, and the insulating body by means of the resilient parts of the electrodes.
The present invention is not restricted to the illustrated embodi-ment. For e~ample, the two main electrodes of a double line arrester may be constructed according to the present invention and be provided with at least one pressed-in contact member. In the event that the electrodesg and/or the contact members are made from relatively inelastic materials, it may be advis-able to apply to the recesses of the electrodes a dot of a relatively quickly setting adhesive so that a firm hold of the contact members in the electrodes is guaranteed upon pressing i~.
. .
,~ .
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A surge arrester having a gas-tight housing comprising: a tubular insulating body; a pair of cup-shaped electrodes, one of the said electrodes being inserted into one end of the said body, the other said electrode being inserted into the other end of said body, each said electrode being provided with a cylindrical contact member, the outer surface of each of the said elec-trodes being provided with a stepped recess into which at least one of the said contact members is pressed.
2. A surge arrester according to Claim 1, wherein the said at least one contact member is in the form of a slotted pin.
3. A surge arrester according to Claim 1, wherein said at least one cylindrical contact member is bevelled at least at the edge of its face thereby being adapted to be pressed into the recess of the corresponding electrode.
4. A surge arrester according to any one of Claims 1 to 3, wherein said at least one contact member adapted to be pressed into the recess is cemented thereto.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7613217U DE7613217U1 (en) | 1976-04-27 | 1976-04-27 | SURGE ARRESTERS |
| DEG7613217.7 | 1976-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1088146A true CA1088146A (en) | 1980-10-21 |
Family
ID=6664756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA276,880A Expired CA1088146A (en) | 1976-04-27 | 1977-04-25 | Surge arrester |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1088146A (en) |
| DE (1) | DE7613217U1 (en) |
-
1976
- 1976-04-27 DE DE7613217U patent/DE7613217U1/en not_active Expired
-
1977
- 1977-04-25 CA CA276,880A patent/CA1088146A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE7613217U1 (en) | 1976-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |