US3805002A - Resiliently-mounted blast-shield for the tank of an oil-circuit breaker - Google Patents

Resiliently-mounted blast-shield for the tank of an oil-circuit breaker Download PDF

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Publication number
US3805002A
US3805002A US00208482A US20848271A US3805002A US 3805002 A US3805002 A US 3805002A US 00208482 A US00208482 A US 00208482A US 20848271 A US20848271 A US 20848271A US 3805002 A US3805002 A US 3805002A
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US
United States
Prior art keywords
blast
tank
shield
interrupting
resiliently
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
Application number
US00208482A
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English (en)
Inventor
R Hess
E Donohue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Inc USA
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE792657D priority Critical patent/BE792657A/fr
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US00208482A priority patent/US3805002A/en
Priority to CA154,959A priority patent/CA984434A/en
Priority to GB5348172A priority patent/GB1410953A/en
Priority to ES409610A priority patent/ES409610A1/es
Priority to JP47125359A priority patent/JPS4872666A/ja
Application granted granted Critical
Publication of US3805002A publication Critical patent/US3805002A/en
Priority to JP1977108838U priority patent/JPS5331252U/ja
Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/68—Liquid-break switches, e.g. oil-break

Definitions

  • Resilient rubber insulators are used in resiliently mounting the shock-resisting plate to absorb the shock forces exerted by the ionized gas products striking the shield.
  • Theinsulating barrier is permitted to resiliently move to accommodate short-duration pressure differences on the front and rear faces thereof, thus avoiding damaging deflections of the plate.
  • circuit-breakers and oil breakers vent a large volume of ionized gas and are products during the interruption of an electrical current. Normally, the ionized gas is expelled out of the current interrupter and toward the grounded tank wall.
  • the volume and pressure of ionized gas, developed and vented toward the inner tank wall can, on occasion, cause failure of the electrical insulation strength.
  • the installation of a resilient blast-shield in an oil circuit-breaker prevents the vented gaseous products from striking the tank wall, and maintains a protected layer of insulating oil. This permits an increase in the dynamic insulation-withstand strength of the oil circuit-breaker.
  • the solution to the foregoing serious problem comprises the resiliently mounting of an insulating plate, say of glass-reinforced polyester laminate, for example, on oil-resistant, resilient rubber, or elastomeric spacers, spaced, for example, four inches from the inner tank wall, and centered on the interrupter vents.
  • This resilient blast-shield provides a cushion for the vented gaseous are products formed during current interruption, and prevents the gas from striking the grounded tank wall.
  • the end result is to permit a higher dynamic insulation-withstand strength to be obtained.
  • the invention is particularly suitable for high-voltage oil circuit-breakers, such as those rated 345 KV, 25,000 M.V.A., which use, for ex ample, four of these blast-shields for each oil tank.
  • a general object of the present invention is to provide an improved resiliently-mounted blast-shield construction for oil-type circuitinterrupters which will resist the shock forces encountered during interruption, and will provide a cushion of clean uncontaminated oil behind the blast plates, so as to maintain entact the internal dielectric strength of the tank wall.
  • An additional object of the present invention is the provision of an improved blast-shield construction for oil-type circuit interrupters, which is resiliently mounted, and is capable of absorbing the tremendous lateral forces encountered during interruption of highfault currents by the breaker.
  • Still a further object of the present invention is the provision of an improved economical and easily installed blast-shield construction for an oil-type circuit interrupter, which is resiliently mounted, and serves to cushion the lateral gas shock forces encountered during high-fault circuit interruption.
  • FIG. 1 is a vertical sectional fragmentary view taken through a high-voltage oil circuit-interrupter, illustrating an application of the present invention, in which two resiliently-mounted blast-shields are applied on opposite sides of one of the two interrupting assemblages disposed in the tank;
  • FIG. 2 is a considerably-enlarged detail view taken along the lines lIlI of FIG. 11;
  • FIG. 3 is a horizontal sectional view, somewhat diagrammatic in nature, illustrating the two interrupting assemblages disposed in an oil circuit-breaker tank, with the location illustrated of the resiliently mounted blast-shields of the present invention
  • FIG. 4 is a side elevational view of an oil circuitbreaker tank, partially broken away in section, indicating the internal welding of metallic studs to the inner tank wall for the resilient shield mounting;
  • FIG. 4A is a showing of a single metallic stud welded to the inner tank wall.
  • FIG. 5 is a fragmentary sectional view taken substantially along the line V-V of FIG. 4;
  • FIG. 6 is a side-elevational view of one of the two insulating blast-shields.
  • FIG. 7 is a side elevational view of the other type of insulating blast-shield utilized.
  • baffle structures for oil circuit-breaker tanks is, broadly speaking, quite old in the art. Reference may, for example, be made to McCloud U.S. Pat. No. 3,157,769, issued Nov. 17, 1964. Additionally, damping devices for oil circuit-breakers have been used heretofore, such as that shown in Bergstrbm, U.S. Pat. No. 3,118,997, issued Jan. 21, 1964. Mankoff et al. U.S. Pat. No. 2,998,499, issued Aug. 29, 1961, and Rampath U.S. Pat. No. 3,514,562, issued May 26, 1970, illustrate other baffle-type arrangements. Finally, McCloud U.S. Pat. No. 3,335,245, issued Aug. 8, 1967, illustrates a further type of brittle construction.
  • the present invention uses a plate of strong insulating non-gas-absorptive material, preferably a glass-polyester laminate, for example, mounted on the internal tank walls of an oil circuit-breaker, and centered on the current interrupter vents.
  • a plate of strong insulating non-gas-absorptive material preferably a glass-polyester laminate, for example, mounted on the internal tank walls of an oil circuit-breaker, and centered on the current interrupter vents.
  • a metal grounded oil tank 1 for accommodating a highvoltage oil-type circuit-interrupter 2.
  • the details of the interrupting structure are not pertinent to the present inven tion, and reference may be made to U.S. Pat. No. 2,816,991, issued Dec. 17, 1957 to Robert E. Friedrich, and assigned to the assignee of the instant application.
  • FIG. 2 illustrates, to a considerably enlarged scale, the welding of metallic studs 8 to the inner tank wall 1 for mounting of the shields l0, 12 of the present invention.
  • molded bumpers 14 of an elastomeric material such as an oil-resistant rubber
  • the elastomeric or resilient bumpers 14 are fabricated, for example, of BUNA-N, which is a copolymer of butadiene and acrylonitrile, and is desirably of an insulating electrical grade, with, accordingly, minimum amounts of lamp black or carbon incorporated therein.
  • BUNA-N is a copolymer of butadiene and acrylonitrile
  • the molded adapter 16 may have a metallic sleeve 18 of metallic material molded therein, the said sleeve being' internally threaded, as at 18a, to thread over the welded stud 8, which is externally threaded.
  • each of the blast-shields 10, 12 are provided with four slots 22 to accommodate the inwardly-directed welded studs 8.
  • blast-shields comprising 0.25 inch thick plates of glass-reinforced polyester laminate.
  • the glass laminate is mounted against molded BUNA-N" rubber bumpers 14 of 70 durometer hardness, which are oilresistant and electrical insulators. These bumpers are placed over the four 0.5 inch threaded studs 8, 2.25 inches long, which have been welded to the inner tank walls 1 of the oil circuit-breakers 2 on, for example, 29 inch centers.
  • a hexagonal steel lock-nut 24 and steel washer 26 placed on the'0.5 inch stud 8, provide dimensional adjustment and a firm backing for the bumper 14.
  • the glass-polyester plate 12 is slotted, as at 22, to permit deflection, as required, to assist in absorbing the shock forces during theopening operation of the circuit-interrupter 2.
  • the mounting is secured with a molded glass-reinforced insulating adapter 16.
  • a threaded steel insert 18, with a rounded head 18b, is used in the molded insulating adapter 16 to provide tensile strength, and to provide a uniform electric potential gradient.
  • Glass-polyester washers 30 are used on both sides of the 0.25 inch polyester laminate sheet 12 to prohibit access to the slot 22 by the rubber bumper l4 and the neoprene washer 34.
  • the neoprene washer 34 provides a resilient cushion to the reaction forces of the deflection of the polyester laminate 12, and gives a visible indication of torque applied to the molded insulating adapter 16.
  • a total of four blast-shields 10, 12 are mounted in one phase of a three-phase breaker 2, or 12 assemblies 40 are required per 3-pole breaker 2. These are mounted to be centered on the interrupter side blocks, or individual interrupter units 3.
  • the blast-shields 12, mounted toward the rear (manway) side of the tank 1, have a 12-inch by 14-inch triangular bevel 50 to permit easy access through the manway 52 by maintenance personnel.
  • the blast-shield 12 is of lightweight design, and can easily be modified to permit installation in various designs of circuitbreakers. We have found that a desirable approximate distance from the blast shield 10, or 12 to the tank wall 1 at the center of the blast shield 10 or 12 is 4.06 inches, as indicated at D in FIGS. 1 and 3.
  • blast-shields could be fabricated of similar plastic, glass-reinforced, fiberglass polyester, and epoxy materials with equivalent results, as well as variations being possible of the molded rubber bumper 14 to give an acceptable cushioning effect.
  • an improved resiliently mounted blast-shield 10 or 12 located internally within the oil circuit-breaker tanks 1 to resiliently absorb the shock of ionized gas products striking the one or more shields 10, 12 during fault-current interruption.
  • the barrier 10 or 12 is permitted to move to accommodate short-duration pressure differences on the front and rear faces thereof, thus avoiding damaging deflection.
  • the use of the resilient blast-shield 10 or 12 affords a significant increase in the dynamic insulation-withstand strength of the oil circuit-breaker 2. Also, use of the resilient blast shield permits extension of breaker capability without increasing tank size, thus saving considerable dollars.
  • An oil circuit-breaker comprising, in combination, a grounded metallic tank, one or more interrupting assemblages disposed within said tank, at least one resiliently-mounted insulating blast-shield formed of relatively hard, rigid, non-gas absorptive plate material disposed closely adjacent the inner wall of the tank yet spaced therefrom to absorb shock forces emanating from the interrupting assemblage, and said blast-shield being additionally located substantially parallel to the tank side wall and interposed between said one interrupting assemblage and the tank side wall.
  • An oil-break circuit-interrupter comprising a grounded metallic tank, a pair of interrupting assemblages disposed within the tank, a conducting bridging member for electrically bridging the two interrupting assemblages, each interrupting assemblage comprising one or more laterally-vented interrupting units having laterally directed vent-openings therein, and each interrupting assemblage having laterally spaced therefrom a pair of resiliently mounted blast-shields formed of relatively hard, rigid, non-gas-absorptive plate material disposed closely adjacent the inner wall of the tank yet spaced therefiom to absorb shock forces emanating from the interrupting assemblages during heavy faultcurrent interruption, and said blast-shields being additionally located substantially parallel to the inner tank wall and interposed between said interrupting assemblages and the tank side wall.
  • a resiliently mounted blast-shield for an oil circuitbreaker tank comprising a generally rectangular insulating plate, stud-means fixedly secured to the inner wall of the tank and protruding through slots provided in said blast-shield, and an elastomeric bumper encircling the stud and resiliently supporting the blastshield.
  • An oil circuit-breaker comprising, in combination, a grounded metallic tank, one or more interrupting assemblages disposed within said tank, at least one resiliently-mounted insulating blast-shield disposed closely adjacent the inner wall of the tank to absorb shock forces emanating from the interrupting assemblage, and elastomeric bumpers being interposed between the tank wall and the blast-shield.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Breakers (AREA)
US00208482A 1971-12-15 1971-12-15 Resiliently-mounted blast-shield for the tank of an oil-circuit breaker Expired - Lifetime US3805002A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE792657D BE792657A (fr) 1971-12-15 Ecran monte elastiquement pour proteger la cuve d'un disjoncteur a huile contre les projections de gaz
US00208482A US3805002A (en) 1971-12-15 1971-12-15 Resiliently-mounted blast-shield for the tank of an oil-circuit breaker
CA154,959A CA984434A (en) 1971-12-15 1972-10-27 Resiliently-mounted blast-shield for the tank of an oil-circuit breaker
GB5348172A GB1410953A (en) 1971-12-15 1972-11-20 Oil-circuit breaker
ES409610A ES409610A1 (es) 1971-12-15 1972-12-14 Un dispositivo disyuntor en bano de aceite.
JP47125359A JPS4872666A (fr) 1971-12-15 1972-12-15
JP1977108838U JPS5331252U (fr) 1971-12-15 1977-08-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00208482A US3805002A (en) 1971-12-15 1971-12-15 Resiliently-mounted blast-shield for the tank of an oil-circuit breaker

Publications (1)

Publication Number Publication Date
US3805002A true US3805002A (en) 1974-04-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00208482A Expired - Lifetime US3805002A (en) 1971-12-15 1971-12-15 Resiliently-mounted blast-shield for the tank of an oil-circuit breaker

Country Status (6)

Country Link
US (1) US3805002A (fr)
JP (2) JPS4872666A (fr)
BE (1) BE792657A (fr)
CA (1) CA984434A (fr)
ES (1) ES409610A1 (fr)
GB (1) GB1410953A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112012796A (zh) * 2020-08-27 2020-12-01 四川亿舟科技股份有限公司 高瓦斯隧道台车防爆控制箱

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0560106U (ja) * 1992-01-13 1993-08-06 株式会社高岳製作所 電力機器のケース
JPH05252776A (ja) * 1992-01-14 1993-09-28 Nec Corp サーボモータ制御装置
CN118123314B (zh) * 2024-05-10 2024-08-06 成都环龙智能机器人有限公司 一种海绵钛反应罐裙座焊接设备及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734973A (en) * 1951-08-18 1956-02-14 Circuit interrupters
US2998499A (en) * 1958-06-04 1961-08-29 Gen Electric Electric circuit breaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4116115Y1 (fr) * 1964-09-08 1966-07-27
JPS453463Y1 (fr) * 1967-01-25 1970-02-17

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734973A (en) * 1951-08-18 1956-02-14 Circuit interrupters
US2998499A (en) * 1958-06-04 1961-08-29 Gen Electric Electric circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112012796A (zh) * 2020-08-27 2020-12-01 四川亿舟科技股份有限公司 高瓦斯隧道台车防爆控制箱
CN112012796B (zh) * 2020-08-27 2022-05-31 四川亿舟科技股份有限公司 高瓦斯隧道台车防爆控制箱

Also Published As

Publication number Publication date
BE792657A (fr) 1973-06-13
ES409610A1 (es) 1975-12-01
CA984434A (en) 1976-02-24
JPS4872666A (fr) 1973-10-01
JPS5331252U (fr) 1978-03-17
GB1410953A (en) 1975-10-22

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AS Assignment

Owner name: ABB POWER T&D COMPANY, INC., A DE CORP., PENNSYLV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.;REEL/FRAME:005368/0692

Effective date: 19891229