US1728559A - Lightning areestee - Google Patents
Lightning areestee Download PDFInfo
- Publication number
- US1728559A US1728559A US1728559DA US1728559A US 1728559 A US1728559 A US 1728559A US 1728559D A US1728559D A US 1728559DA US 1728559 A US1728559 A US 1728559A
- Authority
- US
- United States
- Prior art keywords
- casing
- cup
- lightning
- arrester
- thin
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 description 12
- 229910052573 porcelain Inorganic materials 0.000 description 10
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000001681 protective Effects 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 229940109526 Ery Drugs 0.000 description 2
- 240000003670 Sesamum indicum Species 0.000 description 2
- 230000001419 dependent Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004642 transportation engineering Methods 0.000 description 2
Images
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
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
Definitions
- Our invention relates to electrical protective devices and especially to casings for the same.
- One of the objects of our invention is to provide a lightning-arrester easing having the rugged construction required in lightning arresters and yet having means for securing a positive destruction of the arrester due to a failure of the same.
- Another ob-jectof our invention is to provide a lightning-arrester casing which will visibly indicate a failure of the same.
- the single figure is a View, partially in elevation and partially in cross-section, of a preferred embodiment of our invention.
- a substantially cylindrical casing member 1 is provided with an axially disposed cylindrical chamber 2.
- the casing member 1 is similar to a distributiontype insulator and has projecting flanges or skirts 3.
- a (Lischarging means 4 comprising a stack of resistance disks or plates separated by mica spacers or washers.
- the discharging means is similar to that described in Slepian Patent No. 1,509,493, issued September 23, 1924.
- cup-shaped porcelain member 6 Secured to the end face 5 of the casing member is a separate circular cup-shaped porcelain member 6 which retains the disks 4 in the chamber 2.
- the cup-shaped memher 6 has an annular rim 7 which is glazed to the end surface 5 of the casing member 1, securing the cup-shaped member (3 there to.
- a side-wall portion 8 of reduced thickness Disposed adjacent to the annular rim 7 is a side-wall portion 8 of reduced thickness.
- the bottom 9 of the cup-shaped member 6 is provided with a perforation 10.
- the portion 8 of reduced thickness will be subjected to a lateral stress, due to the expansion of the bottom disks 4 or the bottom terminal plate 11 of the discharging means thereby causing the cup-shaped member 6 to be severed at the said portion 8 of reduced thickness.
- a flexible ground-lead 12 projects through the perforation 10 in the cup-shaped member Serial No. 165.104.
- cup-shaped member 6 will be fractured, as set forth above, and will permit both the stack of disks 4 and the flexible ground lead 12 to-fall free of the casing member.
- the inner diameter of the rim or upper portion of the cup-shaped member 6 is made slightly greater than the diameter of the chamber 2- in order that no restriction may be imposed upon the freedom with which the disks fall free of the casing member.
- the lower end of the casing member 1 is extended to form a tubular projecting portion 13 which provides a protection for the cup-shaped member 6. Thisis necessary since, although the cup-shaped member 6 is relatively strong against axially applied stresses it is inherently weak as to radially applied stresses.
- the proper operation ofthe drop-out bottom is dependent upon the thickness of the section which is fractured by the occurrence of abnormal heating in the lightning arrester.v It is necessary to make this reduced section so thin that it will be fractured very quickly after the failure of the arrest-er occurs.
- the thin-wall portion may have suflicient strength to withstand the shocks incident to transportation and installation, it is necessary. that it shall be as thick aspossible without substantially infipairing the heat-responsive qualities there- 0 v
- the main body of the casing may be 'made by puggingor extruding, which process not only provides a "ery good quality of porcelain, but also is relatively inexpensive.
- cup-shaped member is secured to the main casing member before either member has been fired, and the parts are glazed together during the firingoperation.
- the flexible-ground lead and the discharge elements are inserted in the casing through the open top thereof which is subsequently closed by suitable means (not shown)".
- A. protective device comprisingamassive main casingmember ofwet-process porcelain, said casing member having arr axial perforation or chamber, anda down-'- wardly depending protecting skirt extending below the lower end offsaid' -perforationyor chamber, a cup shaped bottomine'mber of dry-process porcelain glazed to said main casing meinber' near the junctionof said downwardly depending'skirt and said lower end of said perforation-Qrchamber, said cup shaped member having thin sidewalls constituting a continuation of said perforation or chamber in said main casing'member, and discharge "elements disposed in said perfora tion or-chamber and supported-by said cupshaped member.
Description
P 17, 1929- L. R. GOLLADAY ETAL 1,728,559 I LIGHTNING ARRESTER Filed Feb. 1, 1927 WITNESSES aurence a a a 126 and/7779 5 5/290 A'TTORNEY Patented Sept. 17, 1929 UNITED STATES,
PATENT OFFICE LAWRENCE R. GOLLADAY, OF EAST PITTSBURGH, AND IRVING B. SMITH, OF PITTS- BURGH, PENNSYLVANIA, ASSIGNORS TO \VESTINGHOUSE ELECTRIC AND MANU- FACTURING COMPANY, A CORPORATION OF PENNSYLVANIA LIGHTNING ARRESTER Application filed February 1, 1927.
Our invention relates to electrical protective devices and especially to casings for the same.
One of the objects of our invention is to provide a lightning-arrester easing having the rugged construction required in lightning arresters and yet having means for securing a positive destruction of the arrester due to a failure of the same.
Another ob-jectof our invention is to provide a lightning-arrester casing which will visibly indicate a failure of the same. In the accompanying drawing, the single figure is a View, partially in elevation and partially in cross-section, of a preferred embodiment of our invention.
A substantially cylindrical casing member 1 is provided with an axially disposed cylindrical chamber 2. The casing member 1 is similar to a distributiontype insulator and has projecting flanges or skirts 3.
Disposed in the chamber 2 is a (Lischarging means 4 comprising a stack of resistance disks or plates separated by mica spacers or washers. The discharging means is similar to that described in Slepian Patent No. 1,509,493, issued September 23, 1924.
Secured to the end face 5 of the casing member is a separate circular cup-shaped porcelain member 6 which retains the disks 4 in the chamber 2. The cup-shaped memher 6 has an annular rim 7 which is glazed to the end surface 5 of the casing member 1, securing the cup-shaped member (3 there to. Disposed adjacent to the annular rim 7 is a side-wall portion 8 of reduced thickness. The bottom 9 of the cup-shaped member 6 is provided with a perforation 10.
When abnormal heating occurs in the arrester, as a result of a failure thereof, which would permit the line current to follow a discharge therethrough, the portion 8 of reduced thickness will be subjected to a lateral stress, due to the expansion of the bottom disks 4 or the bottom terminal plate 11 of the discharging means thereby causing the cup-shaped member 6 to be severed at the said portion 8 of reduced thickness.
A flexible ground-lead 12 projects through the perforation 10 in the cup-shaped member Serial No. 165.104.
(3, and one end of said ground lead is soldered to the metallic disk or terminal plate 11 upon which the stack of discharge elements 1 is supported.
Vv'hen a failure of the arrester occurs, the
cup-shaped member 6 will be fractured, as set forth above, and will permit both the stack of disks 4 and the flexible ground lead 12 to-fall free of the casing member.
The inner diameter of the rim or upper portion of the cup-shaped member 6 is made slightly greater than the diameter of the chamber 2- in order that no restriction may be imposed upon the freedom with which the disks fall free of the casing member.
The lower end of the casing member 1 is extended to form a tubular projecting portion 13 which provides a protection for the cup-shaped member 6. Thisis necessary since, although the cup-shaped member 6 is relatively strong against axially applied stresses it is inherently weak as to radially applied stresses.
\Vhen it was first attempted to make a frangible drop-out bottom for lightning arresters the casing was made in one piece of dry-process'molded porcelain. This process consists in compressing a quantity of relatively dry ingredients between two faces of a die or mold, thereby forming the member which is subsequently fired. hen the upper portion of the die was withdrawn, the thin wall portion was forced out by the suction created in removing this portion of the die, thereby causing an enormous loss in the process of manufacture. Furthermore, it was not easy, with the old process, to obtain exactly the dimensions desired, and it was practically impossible to inspect or gauge the finished casing to check the thickness of the thin-wall portion, owing-to the fact that there was no room, in the finished product, to apply calipers or other gauging means to the thin-Wall portion.
An attempt was made then to manufacture such a casing by the pugging process, which consists in forming the piece in approximately thedesired shape and subsequently turning it to the exact dimensions re quired. It is very difficult to turn, on a lathe.
a piece having such shape as is shown in the accompanying drawing. In addition, it was substantially impossible to gauge the thickness of the thin-wall portion, as has already been mentioned. v
The proper operation ofthe drop-out bottom is dependent upon the thickness of the section which is fractured by the occurrence of abnormal heating in the lightning arrester.v It is necessary to make this reduced section so thin that it will be fractured very quickly after the failure of the arrest-er occurs. However, in order that the thin-wall portion may have suflicient strength to withstand the shocks incident to transportation and installation, it is necessary. that it shall be as thick aspossible without substantially infipairing the heat-responsive qualities there- 0 v By our invention, we provide a separate "member having a thin-wall portion, said member being manufactured by the dry process. Since thismember is made separately from the casing member, the dimensions may be checked very accurately before attaching the same to the m ain body of the casing.
The main body of the casing,.being now of an easily-turned shape, may be 'made by puggingor extruding, which process not only provides a "ery good quality of porcelain, but also is relatively inexpensive.
.The cup-shaped member is secured to the main casing member before either member has been fired, and the parts are glazed together during the firingoperation. The flexible-ground lead and the discharge elements are inserted in the casing through the open top thereof which is subsequently closed by suitable means (not shown)".
It is apparent that our invention is a valuable contribution to the art of making lightning arresters, in that. it provides a means for visibly indicating the failure of an arrester, which is positive and which may be predetermined to a high degree of accuracy.
Although we have described our invention with reference to a specific example of the construction thereof, it is apparent that our invention is not limited to the details shown, and we desire that the appended til) permitting the circular central portion to be severed from the casing member by abnormal heating occurring in the electrical protective device and to fall free thereof.
3. A. protective device comprisingamassive main casingmember ofwet-process porcelain, said casing member having arr axial perforation or chamber, anda down-'- wardly depending protecting skirt extending below the lower end offsaid' -perforationyor chamber, a cup shaped bottomine'mber of dry-process porcelain glazed to said main casing meinber' near the junctionof said downwardly depending'skirt and said lower end of said perforation-Qrchamber, said cup shaped member having thin sidewalls constituting a continuation of said perforation or chamber in said main casing'member, and discharge "elements disposed in said perfora tion or-chamber and supported-by said cupshaped member.
In testimony whereof, we have hereunto subscribed our names-this 26th day'of January, 1927. LAWRENCE R.- GOLLADAXZ.
IRVING R; SMITH.
Publications (1)
Publication Number | Publication Date |
---|---|
US1728559A true US1728559A (en) | 1929-09-17 |
Family
ID=3418847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US1728559D Expired - Lifetime US1728559A (en) | Lightning areestee |
Country Status (1)
Country | Link |
---|---|
US (1) | US1728559A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2586285A (en) * | 1949-05-14 | 1952-02-19 | Westinghouse Electric Corp | Lightning arrester |
-
0
- US US1728559D patent/US1728559A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2586285A (en) * | 1949-05-14 | 1952-02-19 | Westinghouse Electric Corp | Lightning arrester |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2586285A (en) | Lightning arrester | |
US3218517A (en) | Combined lightning arrester and fuse cutout | |
US4733324A (en) | Surge arrestor | |
US2135085A (en) | Lightning arrester | |
US1728559A (en) | Lightning areestee | |
US3702419A (en) | Lightning arrester with pressure relief means | |
US2151559A (en) | Lightning arrester | |
US2179297A (en) | Porcelain-surface protection | |
US1561249A (en) | Spark-gap lighting arrester | |
US2504438A (en) | Circuit interrupter | |
US3290547A (en) | Pressure relief and failure indicating means for arrester | |
US3448343A (en) | Combined overvoltage protective device and conductor support | |
US2374527A (en) | Lightning arrester and method of manufacture | |
US2422978A (en) | Lightning arrester | |
US1486893A (en) | Collector ring | |
US2305398A (en) | Lightning arrester | |
US2571814A (en) | Lightning arrester | |
US1652990A (en) | Casing for lightning arresters | |
US3586914A (en) | Overload shunt with single resistor element | |
US2565508A (en) | Insulator for pile-up switches | |
US2331852A (en) | Lightning arrester | |
US2060509A (en) | Arrester of extremely high discharge capacity | |
US1726097A (en) | Insulator bushing | |
US3324335A (en) | High voltage protector block | |
US2276054A (en) | Self-clearing lightning arrester |