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US2890312A - Arrangement in air blast circuit breakers in which drying air is delivered to the control air pipe - Google Patents

Arrangement in air blast circuit breakers in which drying air is delivered to the control air pipe Download PDF

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Publication number
US2890312A
US2890312A US682174A US68217457A US2890312A US 2890312 A US2890312 A US 2890312A US 682174 A US682174 A US 682174A US 68217457 A US68217457 A US 68217457A US 2890312 A US2890312 A US 2890312A
Authority
US
United States
Prior art keywords
air
pipe
air pipe
control
delivered
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
US682174A
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English (en)
Inventor
Forwald Haakon
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 Norden Holding AB
Original Assignee
ASEA AB
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
Application filed by ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US2890312A publication Critical patent/US2890312A/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
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H01H33/562—Means for avoiding liquefaction or for disposing of liquefaction products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0066—Auxiliary contact devices

Definitions

  • the quantity of air necessary to keep the air pipe dry is very small and the air supply can be fixed by using a capillary tube as a pressure reducing valve.
  • the air consumption can however be increased by leakage at the operating valve of the circuit breaker or by leakage at joints in the control air pipe when the control air pipe is arranged inside a pillar insulator filled with compressed air.
  • the present invention relates to an arrangement in air blast circuit breakers, in which drying air is delivered to the control air pipe of the circuit breaker through a capillary tube and in which means for indicating leakage of air to said control air pipe is arranged.
  • the invention is mainly characterised in that the drying air leaves the control air pipe through a restricted outlet opening, so that the pressure inside said pipe is dependent on the air quantity streaming into it, and in that pressure indicating means connected to the control air pipe is arranged to indicate the pressure in said control air pipe and to give a signal when the pressure has reached a certain predetermined value because of air leakage to said pipe.
  • the restricted outlet opening may consist of a nozzle through which the control air pipe permanently communicates with the atmosphere.
  • a back valve may be arranged between the outlet opening and the atmosphere or the control air pipe.
  • the arrangement includes a container 1 filled with compressed air.
  • This container carries a pillar insulator 2 upon which a connecting member 3 is arranged.
  • This member 3 carries two extinguishing chambers 4, which through the annular channel 5 inside the pillar insulator 2, permanently communicate with the compressed air container 1.
  • the operating mechanism of the extinguishing chambers may be connected to the container 1 by means of the valve device 6 and the control pipe 7.
  • the control air pipe 7 is arranged inside the pillar insulator 2 and consists partly of an insulating pipe 8. At the upper part of the control air pipe in the connecting member 3 a restricted outlet opening 9 is arranged.
  • valve member 10 which is movable between an upper 2,890,312 Patented June 9, 1959 valve seat 11 and a lower valve seat 12.
  • This valve member is actuated by a spring 13 against the lower valve seat 12.
  • the valve device 6 at the lower part of the control air pipe contains an operating rod 14 and attached to said rod a valve disc 15 which closes the opening 16 between the control air pipe 7 and the container 1, and a valve disc 17 is movable upon the rod 14 and closes the opening 18 between the control air pipe and the atmosphere.
  • the device 31 is a pressure indicating device, which is influenced by the pressure in the control air pipe.
  • this device there is a breaking gap 32 of a signal circuit 33 and a movable contact bridge 34, connected to the piston 35 of the indicating device.
  • the piston 35 is actuated in one direction of the spring 36 and in the opposite direction of the pressure in the control air pipe.
  • the arrangement operates in the following Way.
  • the pressure of the control air pipe only slightly exceeds the atmospheric pressure. Drying air streams from the air container 1 through the pipe 24 and the capillary tube 26 into the control air pipe and hits the shield 27 so that the breaking gap 29 of the circuit indicating faults is held open.
  • the drying air which, by its expansion has a relatively low percentage of moisture, passes through the control air pipe 7 and streams out through the restricted outlet opening 9. During its passage through the pipe the air absorbs moisture and thus keeps the walls of the pipe dry. In the control air pipe, a small excess of pressure is maintained, and the value of this excess pressure depends on the area of the restricted outlet opening 9 and the quantity of air delivered to the control air pipe.
  • the breaking gap 32 With normal pressure in the control air pipe the breaking gap 32 is open. If the quantity of air, coming into the control air pipe increases for instance because of a leakage at the valve disc 15, or because of leakage at the joints at the ends of the tube 8 the pressure in the conduit 7 increases. The piston 35 then moves the contact bridge 34 to the left so that the breaking gap 32 is closed and a signal is given.
  • the valve between the restricted outlet opening 9 and the atmosphere is not absolutely necessary but is mostly very favorable.
  • the valve member 10 prevents air from streaming into the control air pipe through the opening 9.
  • the control air pipe, through the opening 16 communicates with the compressed air container 1, the pressure increases in said pipe.
  • the quantity of air escaping through the opening 9 increases and lifts the valve member 10 up to the valve seat 11, and thus prevents air from streaming out from the control air pipe when the breaker is open and the pipe is under operating pressure.
  • 37 indicates a breaking gap in a signal circuit, which suitably is opened when operating air is delivered to the control air pipe. The opening of this breaking gap 37 prevents the signal lamps from being switched on when the breaking gaps 29 and 32 are closed because of operating pressure in thecontrol air pipe but thehigh pressure does not cause faults in the circuit breaker.
  • An air blast circuit breaker comprising a control air pipe for the delivery of drying air, a tube device for the admission of the drying air to the control air pipe, a restricted outlet opening for the passage of the 10 drying air from the said pipe so that the air pressure in the pipe depends upon. the volume of the air delivered thereto, and pressure indicating means in communication with the air pressure in said pipe for signalling when the said air pressure exceeds a predetermined, value.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Drying Of Solid Materials (AREA)
  • Drying Of Gases (AREA)
  • Circuit Breakers (AREA)
US682174A 1956-10-11 1957-09-05 Arrangement in air blast circuit breakers in which drying air is delivered to the control air pipe Expired - Lifetime US2890312A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE816315X 1956-10-11

Publications (1)

Publication Number Publication Date
US2890312A true US2890312A (en) 1959-06-09

Family

ID=20345532

Family Applications (1)

Application Number Title Priority Date Filing Date
US682174A Expired - Lifetime US2890312A (en) 1956-10-11 1957-09-05 Arrangement in air blast circuit breakers in which drying air is delivered to the control air pipe

Country Status (4)

Country Link
US (1) US2890312A (de)
DE (1) DE1025043B (de)
FR (1) FR1183159A (de)
GB (1) GB816315A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3619527A (en) * 1968-11-06 1971-11-09 Merlin Gerin Compressed-air electric apparatus embodying a drying device
US3703619A (en) * 1966-11-03 1972-11-21 Merlin Gerin Compressed gas circuit interrupter having a closed-cycle high pressure heating circulation
US3749869A (en) * 1971-05-25 1973-07-31 Mitsubishi Electric Corp Liquid-prevention device for arc-extinguishing gas compressed-gas circuit breakers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1260589B (de) * 1962-03-09 1968-02-08 Ass Elect Ind Schaltventil fuer Druckgasschalter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US828262A (en) * 1902-05-23 1906-08-07 Daniel B Adams Automatic stopping device and alarm.
US2643315A (en) * 1949-08-18 1953-06-23 Asea Ab Arrangement in electric air blast circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US828262A (en) * 1902-05-23 1906-08-07 Daniel B Adams Automatic stopping device and alarm.
US2643315A (en) * 1949-08-18 1953-06-23 Asea Ab Arrangement in electric air blast circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703619A (en) * 1966-11-03 1972-11-21 Merlin Gerin Compressed gas circuit interrupter having a closed-cycle high pressure heating circulation
US3619527A (en) * 1968-11-06 1971-11-09 Merlin Gerin Compressed-air electric apparatus embodying a drying device
US3749869A (en) * 1971-05-25 1973-07-31 Mitsubishi Electric Corp Liquid-prevention device for arc-extinguishing gas compressed-gas circuit breakers

Also Published As

Publication number Publication date
FR1183159A (fr) 1959-07-03
DE1025043B (de) 1958-02-27
GB816315A (en) 1959-07-08

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