US3881080A - Low-fluid volume outdoor power circuit breaker - Google Patents

Low-fluid volume outdoor power circuit breaker Download PDF

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Publication number
US3881080A
US3881080A US206052A US20605271A US3881080A US 3881080 A US3881080 A US 3881080A US 206052 A US206052 A US 206052A US 20605271 A US20605271 A US 20605271A US 3881080 A US3881080 A US 3881080A
Authority
US
United States
Prior art keywords
circuit breaker
pressure
power circuit
low
fluid volume
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
US206052A
Other languages
English (en)
Inventor
Hans Widmer
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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 DE19702104496 priority Critical patent/DE2104496A1/de
Priority to CH38171A priority patent/CH526198A/de
Priority to DE7103552U priority patent/DE7103552U/de
Priority to AT814071A priority patent/AT325135B/de
Priority to US206052A priority patent/US3881080A/en
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Priority to GB121572A priority patent/GB1341672A/en
Priority to SE7200230A priority patent/SE383580C/xx
Priority to FR7200605A priority patent/FR2121691B1/fr
Application granted granted Critical
Publication of US3881080A publication Critical patent/US3881080A/en
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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • H01H33/75—Liquid-break switches, e.g. oil-break

Definitions

  • a low-fluid volume outdoor power circuit breaker includes an outer porcelain insulator structure within which are housed a quenching chamber tube that encloses a quenching chamber having associated therewith the stationary and movable contact structure of the breaker.
  • a pressure-absorbing barrier is provided in order to protect the circuit breaker structure against the destructive forces of great pressure waves generated within the circuit breaker by steep current surges having a high peak value and which result from the switching of capacitors.
  • This barrier which may be in the form ofa helically wound gas filled tube of insulating material or a sheath of expanded insulating material. is located intermediate the outer porcelain insulator structure and the quenching chamber tube. being applied to the outer surface of the latter.
  • the pressure absorbing barrier may also be surrounded by a porous dielectric fabric sheath as a safety measure to prevent any portions of the barrier from being broken away by the pressure waves.
  • Ci uI'BR A ER outdoor power circuit breaker makes increased idemands andzimposes higher stresses onthe.
  • circuit elements in special circuits for,.exarnple for theswitching ofcapacitors... h v I I Capacitors are frequently connected in series with the lines, or to earth, in order to improve the power factor in long high-voltage transmission lines. Shortcircuiting or switching-on of such capacitors results in extremely steep current surges with a high peak value and a high make" frequency. This, in turn, results in powerful pressure waves which propagate very rapidly and in surges from the prestriking of the make arc. Insulating materials of the kind used at the present time and employed in circuit elements are unable to withstand such pressure waves and are accordingly destroyed thereby.
  • the external insulator of such a circuit element is constructed of porcelain and is particularly exposed to risks due to such pressure waves, this also applying to parts of the quenching chamber which are adjacent to the pressure source.
  • the primary object of the present invention is to provide a switch arrangement which is free of the disadvantages and defects of known systems.
  • this problem is solved in that a pressure-absorbing barrier is provided in the switching element for absorbing high order pressure waves generated by high order switching currents produced when capacitors are switched.
  • the advantage of the invention is due to the fact that insulating parts disposed close to the pressure wave can be adapted to extreme stresses while the provision of a barrier for absorbing the pressure wave peaks protects the insulator. Accordingly, the circuit breaker will be capable of performing capacitor switch-.
  • a damping tube of insulating material is disposed in the switching element to function as the pressure-absorbing barrier, both ends of the said tube being closed and being filled with air or a dielectric gas.
  • the damping tube filled with air at atmospheric pressure, or with a dielectric gas, and being preferably constructed of a gas-tight elastic material or a plastics composition, is coiled onto the quenching chamber tube and secured thereon with a suitable adhesive material.
  • the individual turns of the gaseous filled damp ing coil may also be adhesively joined to each other.
  • the pressure-absorbing barrier consists of a sheath of expaii' de dinsulatiiig mate rial which is disposed in the switching "element.
  • the pressure-absorbing barrier is surrounded by a porous, dielectric fabric sheath to prevent any part of the dampinggtube turns or' 'th e'exp'anded material from becoming detached bythe pressure waves.
  • the numeral 1 refers to ari outer porcelain insulator of an outdoor power circuit breaker having disposed therein a quenching chamber tube 2, adapted to accommodate the quenching chamber 3, movable contacts 4 and stationary contacts 5, and a contact pin 6 which extends through the quenching chamber 3.
  • FIG. 2 A further example of a damping arrangement is illustrated in FIG. 2 wherein the damping member is constituted by a cylindrical tube made from an insulating, pressure-absorbing expanded material 9 located on the outer side of the quenching chamber enclosing insulator tube 2.
  • the tube 9 can thus be made from foam rubber, Styropor or a similar material. Except for this difference, the circuit breaker construction is the same as 7 that illustrated in FIG. 1 and corresponding components have been assigned the same reference numerals.
  • the power rating of the switching elements is improved with simple means in the system according to the invention and conventional, low-fluid volume circuit breakers may be employed as capacitor circuit breakers.
  • a low-fluid volume outdoor power circuit breaker comprising a set of switching contacts, a cylindrical insulator tube forming a closed quenching chamber of the fluid medium type in which said set of switching contacts are located, an outer cylindrical porcelain insulator surrounding and spaced radially from said.insu lator tube,and a cylindrical pressure absorbing barrier surrounding and in contact with-the outer surface of said insulator tube, the pressure waves generated in said fluid quenching .mediu m upon operation of said contacts in switching high order currents produced when switching capacitors being directed against and primarily takenup by said insulator tube whereas the peaks of said pressure waves are damped by absorption within said pressure absorbing barrier thereby to prevent said pressure peaks from reaching the wall of said outer porcelaininsulator.

Landscapes

  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US206052A 1971-01-12 1971-12-08 Low-fluid volume outdoor power circuit breaker Expired - Lifetime US3881080A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DE19702104496 DE2104496A1 (zh) 1971-01-12 1970-03-25
CH38171A CH526198A (de) 1971-01-12 1971-01-12 Flüssigkeitsarmer Freiluft-Leistungsschalter
DE7103552U DE7103552U (de) 1971-01-12 1971-02-01 Flüssigkeitsarmer Freiluft-Leistungsschalter
AT814071A AT325135B (de) 1971-01-12 1971-09-20 Flüssigkeitsarmer freiluft-leistungsschalter
US206052A US3881080A (en) 1971-01-12 1971-12-08 Low-fluid volume outdoor power circuit breaker
GB121572A GB1341672A (en) 1971-01-12 1972-01-10 Low-liquid volume power circuit breakers
SE7200230A SE383580C (sv) 1971-01-12 1972-01-10 Vestkefattig effektbrytare
FR7200605A FR2121691B1 (zh) 1971-01-12 1972-01-10

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH38171A CH526198A (de) 1971-01-12 1971-01-12 Flüssigkeitsarmer Freiluft-Leistungsschalter
US206052A US3881080A (en) 1971-01-12 1971-12-08 Low-fluid volume outdoor power circuit breaker

Publications (1)

Publication Number Publication Date
US3881080A true US3881080A (en) 1975-04-29

Family

ID=25684404

Family Applications (1)

Application Number Title Priority Date Filing Date
US206052A Expired - Lifetime US3881080A (en) 1971-01-12 1971-12-08 Low-fluid volume outdoor power circuit breaker

Country Status (7)

Country Link
US (1) US3881080A (zh)
AT (1) AT325135B (zh)
CH (1) CH526198A (zh)
DE (2) DE2104496A1 (zh)
FR (1) FR2121691B1 (zh)
GB (1) GB1341672A (zh)
SE (1) SE383580C (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110289190A (zh) * 2015-10-23 2019-09-27 北京瑞恒新源投资有限公司 带真空灭弧室的多功能电容型套管

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT247823B (de) * 1964-05-08 1966-06-27 Vogelbusch Gmbh Vorrichtung zur Begasung von Flüssigkeiten in einem Behälter
CH546006A (zh) * 1973-05-07 1974-02-15

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118997A (en) * 1958-12-16 1964-01-21 Asea Ab Damping device for oil circuit breakers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH348439A (de) * 1957-03-27 1960-08-31 Oerlikon Maschf Schalter mit flüssigem Löschmedium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118997A (en) * 1958-12-16 1964-01-21 Asea Ab Damping device for oil circuit breakers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110289190A (zh) * 2015-10-23 2019-09-27 北京瑞恒新源投资有限公司 带真空灭弧室的多功能电容型套管

Also Published As

Publication number Publication date
SE383580B (sv) 1976-03-15
DE7103552U (de) 1972-11-30
FR2121691B1 (zh) 1977-09-02
DE2104496A1 (zh) 1972-07-27
FR2121691A1 (zh) 1972-08-25
AT325135B (de) 1975-10-10
GB1341672A (en) 1973-12-25
CH526198A (de) 1972-07-31
SE383580C (sv) 1981-08-03

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